import { wcdbService } from './wcdbService'
import { ConfigService } from './config'
import { ContactCacheService } from './contactCacheService'
import { existsSync, mkdirSync } from 'fs'
import { readFile, writeFile, mkdir } from 'fs/promises'
import { basename, join } from 'path'
import crypto from 'crypto'
import { WasmService } from './wasmService'
import zlib from 'zlib'

export interface SnsLivePhoto {
    url: string
    thumb: string
    md5?: string
    token?: string
    key?: string
    encIdx?: string
}

export interface SnsMedia {
    url: string
    thumb: string
    md5?: string
    token?: string
    key?: string
    encIdx?: string
    livePhoto?: SnsLivePhoto
}

export interface SnsPost {
    id: string
    tid?: string       // 数据库主键（雪花 ID），用于精确删除
    username: string
    nickname: string
    avatarUrl?: string
    createTime: number
    contentDesc: string
    type?: number
    media: SnsMedia[]
    likes: string[]
    comments: { id: string; nickname: string; content: string; refCommentId: string; refNickname?: string; emojis?: { url: string; md5: string; width: number; height: number; encryptUrl?: string; aesKey?: string }[] }[]
    rawXml?: string
    linkTitle?: string
    linkUrl?: string
}



const fixSnsUrl = (url: string, token?: string, isVideo: boolean = false) => {
    if (!url) return url

    let fixedUrl = url.replace('http://', 'https://')

    // 只有非视频（即图片）才需要处理 /150 变 /0
    if (!isVideo) {
        fixedUrl = fixedUrl.replace(/\/150($|\?)/, '/0$1')
    }

    if (!token || fixedUrl.includes('token=')) return fixedUrl

    // 根据用户要求，视频链接组合方式为: BASE_URL + "?" + "token=" + token + "&idx=1" + 原有参数
    if (isVideo) {
        const urlParts = fixedUrl.split('?')
        const baseUrl = urlParts[0]
        const existingParams = urlParts[1] ? `&${urlParts[1]}` : ''
        return `${baseUrl}?token=${token}&idx=1${existingParams}`
    }

    const connector = fixedUrl.includes('?') ? '&' : '?'
    return `${fixedUrl}${connector}token=${token}&idx=1`
}

const detectImageMime = (buf: Buffer, fallback: string = 'image/jpeg') => {
    if (!buf || buf.length < 4) return fallback

    // JPEG
    if (buf[0] === 0xff && buf[1] === 0xd8 && buf[2] === 0xff) return 'image/jpeg'

    // PNG
    if (
        buf.length >= 8 &&
        buf[0] === 0x89 && buf[1] === 0x50 && buf[2] === 0x4e && buf[3] === 0x47 &&
        buf[4] === 0x0d && buf[5] === 0x0a && buf[6] === 0x1a && buf[7] === 0x0a
    ) return 'image/png'

    // GIF
    if (buf.length >= 6) {
        const sig = buf.subarray(0, 6).toString('ascii')
        if (sig === 'GIF87a' || sig === 'GIF89a') return 'image/gif'
    }

    // WebP
    if (
        buf.length >= 12 &&
        buf[0] === 0x52 && buf[1] === 0x49 && buf[2] === 0x46 && buf[3] === 0x46 &&
        buf[8] === 0x57 && buf[9] === 0x45 && buf[10] === 0x42 && buf[11] === 0x50
    ) return 'image/webp'

    // BMP
    if (buf[0] === 0x42 && buf[1] === 0x4d) return 'image/bmp'

    // MP4: 00 00 00 18 / 20 / ... + 'ftyp'
    if (buf.length > 8 && buf[4] === 0x66 && buf[5] === 0x74 && buf[6] === 0x79 && buf[7] === 0x70) return 'video/mp4'

    // Fallback logic for video
    if (fallback.includes('video') || fallback.includes('mp4')) return 'video/mp4'

    return fallback
}

export const isVideoUrl = (url: string) => {
    if (!url) return false
    // 排除 vweixinthumb 域名 (缩略图)
    if (url.includes('vweixinthumb')) return false
    return url.includes('snsvideodownload') || url.includes('video') || url.includes('.mp4')
}

import { Isaac64 } from './isaac64'

const extractVideoKey = (xml: string): string | undefined => {
    if (!xml) return undefined
    // 匹配 <enc key="2105122989" ... /> 或 <enc key="2105122989">
    const match = xml.match(/<enc\s+key="(\d+)"/i)
    return match ? match[1] : undefined
}

/**
 * 从 XML 中解析评论信息（含表情包、回复关系）
 */
function parseCommentsFromXml(xml: string): { id: string; nickname: string; content: string; refCommentId: string; refNickname?: string; emojis?: { url: string; md5: string; width: number; height: number; encryptUrl?: string; aesKey?: string }[] }[] {
    if (!xml) return []

    type CommentItem = {
        id: string; nickname: string; username?: string; content: string
        refCommentId: string; refUsername?: string; refNickname?: string
        emojis?: { url: string; md5: string; width: number; height: number; encryptUrl?: string; aesKey?: string }[]
    }
    const comments: CommentItem[] = []

    try {
        // 支持多种标签格式
        let listMatch = xml.match(/<CommentUserList>([\s\S]*?)<\/CommentUserList>/i)
        if (!listMatch) listMatch = xml.match(/<commentUserList>([\s\S]*?)<\/commentUserList>/i)
        if (!listMatch) listMatch = xml.match(/<commentList>([\s\S]*?)<\/commentList>/i)
        if (!listMatch) listMatch = xml.match(/<comment_user_list>([\s\S]*?)<\/comment_user_list>/i)
        if (!listMatch) return comments

        const listXml = listMatch[1]
        const itemRegex = /<(?:CommentUser|commentUser|comment|user_comment)>([\s\S]*?)<\/(?:CommentUser|commentUser|comment|user_comment)>/gi
        let m: RegExpExecArray | null

        while ((m = itemRegex.exec(listXml)) !== null) {
            const c = m[1]

            const idMatch = c.match(/<(?:cmtid|commentId|comment_id|id)>([^<]*)<\/(?:cmtid|commentId|comment_id|id)>/i)
            const usernameMatch = c.match(/<username>([^<]*)<\/username>/i)
            let nicknameMatch = c.match(/<nickname>([^<]*)<\/nickname>/i)
            if (!nicknameMatch) nicknameMatch = c.match(/<nickName>([^<]*)<\/nickName>/i)
            const contentMatch = c.match(/<content>([^<]*)<\/content>/i)
            const refIdMatch = c.match(/<(?:refCommentId|replyCommentId|ref_comment_id)>([^<]*)<\/(?:refCommentId|replyCommentId|ref_comment_id)>/i)
            const refNickMatch = c.match(/<(?:refNickname|refNickName|replyNickname)>([^<]*)<\/(?:refNickname|refNickName|replyNickname)>/i)
            const refUserMatch = c.match(/<ref_username>([^<]*)<\/ref_username>/i)

            // 解析表情包
            const emojis: { url: string; md5: string; width: number; height: number; encryptUrl?: string; aesKey?: string }[] = []
            const emojiRegex = /<emojiinfo>([\s\S]*?)<\/emojiinfo>/gi
            let em: RegExpExecArray | null
            while ((em = emojiRegex.exec(c)) !== null) {
                const ex = em[1]
                const externUrl = ex.match(/<extern_url>([^<]*)<\/extern_url>/i)
                const cdnUrl = ex.match(/<cdn_url>([^<]*)<\/cdn_url>/i)
                const plainUrl = ex.match(/<url>([^<]*)<\/url>/i)
                const urlMatch = externUrl || cdnUrl || plainUrl
                const md5Match = ex.match(/<md5>([^<]*)<\/md5>/i)
                const wMatch = ex.match(/<width>([^<]*)<\/width>/i)
                const hMatch = ex.match(/<height>([^<]*)<\/height>/i)
                const encMatch = ex.match(/<encrypt_url>([^<]*)<\/encrypt_url>/i)
                const aesMatch = ex.match(/<aes_key>([^<]*)<\/aes_key>/i)

                const url = urlMatch ? urlMatch[1].trim().replace(/&amp;/g, '&') : ''
                const encryptUrl = encMatch ? encMatch[1].trim().replace(/&amp;/g, '&') : undefined
                const aesKey = aesMatch ? aesMatch[1].trim() : undefined

                if (url || encryptUrl) {
                    emojis.push({
                        url,
                        md5: md5Match ? md5Match[1].trim() : '',
                        width: wMatch ? parseInt(wMatch[1]) : 0,
                        height: hMatch ? parseInt(hMatch[1]) : 0,
                        encryptUrl,
                        aesKey
                    })
                }
            }

            if (nicknameMatch && (contentMatch || emojis.length > 0)) {
                const refId = refIdMatch ? refIdMatch[1].trim() : ''
                comments.push({
                    id: idMatch ? idMatch[1].trim() : `cmt_${Date.now()}_${Math.random()}`,
                    nickname: nicknameMatch[1].trim(),
                    username: usernameMatch ? usernameMatch[1].trim() : undefined,
                    content: contentMatch ? contentMatch[1].trim() : '',
                    refCommentId: refId === '0' ? '' : refId,
                    refUsername: refUserMatch ? refUserMatch[1].trim() : undefined,
                    refNickname: refNickMatch ? refNickMatch[1].trim() : undefined,
                    emojis: emojis.length > 0 ? emojis : undefined
                })
            }
        }

        // 二次解析：通过 refUsername 补全 refNickname
        const userMap = new Map<string, string>()
        for (const c of comments) {
            if (c.username && c.nickname) userMap.set(c.username, c.nickname)
        }
        for (const c of comments) {
            if (!c.refNickname && c.refUsername && c.refCommentId) {
                c.refNickname = userMap.get(c.refUsername)
            }
        }
    } catch (e) {
        console.error('[SnsService] parseCommentsFromXml 失败:', e)
    }

    return comments
}

class SnsService {
    private configService: ConfigService
    private contactCache: ContactCacheService
    private imageCache = new Map<string, string>()
    private exportStatsCache: { totalPosts: number; totalFriends: number; updatedAt: number } | null = null
    private readonly exportStatsCacheTtlMs = 5 * 60 * 1000
    private lastTimelineFallbackAt = 0
    private readonly timelineFallbackCooldownMs = 3 * 60 * 1000

    constructor() {
        this.configService = new ConfigService()
        this.contactCache = new ContactCacheService(this.configService.get('cachePath') as string)
    }

    private parseCountValue(row: any): number {
        if (!row || typeof row !== 'object') return 0
        const raw = row.total ?? row.count ?? row.cnt ?? Object.values(row)[0]
        const num = Number(raw)
        return Number.isFinite(num) && num > 0 ? Math.floor(num) : 0
    }

    private pickTimelineUsername(post: any): string {
        const raw = post?.username ?? post?.user_name ?? post?.userName ?? ''
        if (typeof raw !== 'string') return ''
        return raw.trim()
    }

    private async getExportStatsFromTimeline(): Promise<{ totalPosts: number; totalFriends: number }> {
        const pageSize = 500
        const uniqueUsers = new Set<string>()
        let totalPosts = 0
        let offset = 0

        for (let round = 0; round < 2000; round++) {
            const result = await wcdbService.getSnsTimeline(pageSize, offset, undefined, undefined, 0, 0)
            if (!result.success || !Array.isArray(result.timeline)) {
                throw new Error(result.error || '获取朋友圈统计失败')
            }

            const rows = result.timeline
            if (rows.length === 0) break

            totalPosts += rows.length
            for (const row of rows) {
                const username = this.pickTimelineUsername(row)
                if (username) uniqueUsers.add(username)
            }

            if (rows.length < pageSize) break
            offset += rows.length
        }

        return {
            totalPosts,
            totalFriends: uniqueUsers.size
        }
    }

    private parseLikesFromXml(xml: string): string[] {
        if (!xml) return []
        const likes: string[] = []
        try {
            let likeListMatch = xml.match(/<LikeUserList>([\s\S]*?)<\/LikeUserList>/i)
            if (!likeListMatch) likeListMatch = xml.match(/<likeUserList>([\s\S]*?)<\/likeUserList>/i)
            if (!likeListMatch) likeListMatch = xml.match(/<likeList>([\s\S]*?)<\/likeList>/i)
            if (!likeListMatch) likeListMatch = xml.match(/<like_user_list>([\s\S]*?)<\/like_user_list>/i)
            if (!likeListMatch) return likes

            const likeUserRegex = /<(?:LikeUser|likeUser|user_comment)>([\s\S]*?)<\/(?:LikeUser|likeUser|user_comment)>/gi
            let m: RegExpExecArray | null
            while ((m = likeUserRegex.exec(likeListMatch[1])) !== null) {
                let nick = m[1].match(/<nickname>([^<]*)<\/nickname>/i)
                if (!nick) nick = m[1].match(/<nickName>([^<]*)<\/nickName>/i)
                if (nick) likes.push(nick[1].trim())
            }
        } catch (e) {
            console.error('[SnsService] 解析点赞失败:', e)
        }
        return likes
    }

    private parseMediaFromXml(xml: string): { media: SnsMedia[]; videoKey?: string } {
        if (!xml) return { media: [] }
        const media: SnsMedia[] = []
        let videoKey: string | undefined
        try {
            const encMatch = xml.match(/<enc\s+key="(\d+)"/i)
            if (encMatch) videoKey = encMatch[1]

            const mediaRegex = /<media>([\s\S]*?)<\/media>/gi
            let mediaMatch: RegExpExecArray | null
            while ((mediaMatch = mediaRegex.exec(xml)) !== null) {
                const mx = mediaMatch[1]
                const urlMatch = mx.match(/<url[^>]*>([^<]+)<\/url>/i)
                const urlTagMatch = mx.match(/<url([^>]*)>/i)
                const thumbMatch = mx.match(/<thumb[^>]*>([^<]+)<\/thumb>/i)
                const thumbTagMatch = mx.match(/<thumb([^>]*)>/i)

                let urlToken: string | undefined, urlKey: string | undefined
                let urlMd5: string | undefined, urlEncIdx: string | undefined
                if (urlTagMatch?.[1]) {
                    const a = urlTagMatch[1]
                    urlToken = a.match(/token="([^"]+)"/i)?.[1]
                    urlKey = a.match(/key="([^"]+)"/i)?.[1]
                    urlMd5 = a.match(/md5="([^"]+)"/i)?.[1]
                    urlEncIdx = a.match(/enc_idx="([^"]+)"/i)?.[1]
                }
                let thumbToken: string | undefined, thumbKey: string | undefined, thumbEncIdx: string | undefined
                if (thumbTagMatch?.[1]) {
                    const a = thumbTagMatch[1]
                    thumbToken = a.match(/token="([^"]+)"/i)?.[1]
                    thumbKey = a.match(/key="([^"]+)"/i)?.[1]
                    thumbEncIdx = a.match(/enc_idx="([^"]+)"/i)?.[1]
                }

                const item: SnsMedia = {
                    url: urlMatch ? urlMatch[1].trim() : '',
                    thumb: thumbMatch ? thumbMatch[1].trim() : '',
                    token: urlToken || thumbToken,
                    key: urlKey || thumbKey,
                    md5: urlMd5,
                    encIdx: urlEncIdx || thumbEncIdx
                }

                const livePhotoMatch = mx.match(/<livePhoto>([\s\S]*?)<\/livePhoto>/i)
                if (livePhotoMatch) {
                    const lx = livePhotoMatch[1]
                    const lpUrl = lx.match(/<url[^>]*>([^<]+)<\/url>/i)
                    const lpUrlTag = lx.match(/<url([^>]*)>/i)
                    const lpThumb = lx.match(/<thumb[^>]*>([^<]+)<\/thumb>/i)
                    const lpThumbTag = lx.match(/<thumb([^>]*)>/i)
                    let lpToken: string | undefined, lpKey: string | undefined, lpEncIdx: string | undefined
                    if (lpUrlTag?.[1]) {
                        const a = lpUrlTag[1]
                        lpToken = a.match(/token="([^"]+)"/i)?.[1]
                        lpKey = a.match(/key="([^"]+)"/i)?.[1]
                        lpEncIdx = a.match(/enc_idx="([^"]+)"/i)?.[1]
                    }
                    if (!lpToken && lpThumbTag?.[1]) lpToken = lpThumbTag[1].match(/token="([^"]+)"/i)?.[1]
                    if (!lpKey && lpThumbTag?.[1]) lpKey = lpThumbTag[1].match(/key="([^"]+)"/i)?.[1]
                    item.livePhoto = {
                        url: lpUrl ? lpUrl[1].trim() : '',
                        thumb: lpThumb ? lpThumb[1].trim() : '',
                        token: lpToken,
                        key: lpKey,
                        encIdx: lpEncIdx
                    }
                }
                media.push(item)
            }
        } catch (e) {
            console.error('[SnsService] 解析媒体 XML 失败:', e)
        }
        return { media, videoKey }
    }

    private getSnsCacheDir(): string {
        const cachePath = this.configService.getCacheBasePath()
        const snsCacheDir = join(cachePath, 'sns_cache')
        if (!existsSync(snsCacheDir)) {
            mkdirSync(snsCacheDir, { recursive: true })
        }
        return snsCacheDir
    }

    private getCacheFilePath(url: string): string {
        const hash = crypto.createHash('md5').update(url).digest('hex')
        const ext = isVideoUrl(url) ? '.mp4' : '.jpg'
        return join(this.getSnsCacheDir(), `${hash}${ext}`)
    }

    async getSnsUsernames(): Promise<{ success: boolean; usernames?: string[]; error?: string }> {
        const result = await wcdbService.execQuery('sns', null, 'SELECT DISTINCT user_name FROM SnsTimeLine')
        if (!result.success || !result.rows) {
            // 尝试 userName 列名
            const result2 = await wcdbService.execQuery('sns', null, 'SELECT DISTINCT userName FROM SnsTimeLine')
            if (!result2.success || !result2.rows) return { success: false, error: result.error || result2.error }
            return { success: true, usernames: result2.rows.map((r: any) => r.userName).filter(Boolean) }
        }
        return { success: true, usernames: result.rows.map((r: any) => r.user_name).filter(Boolean) }
    }

    async getUserPostCounts(): Promise<{ success: boolean; data?: Record<string, number>; error?: string }> {
        try {
            const counts: Record<string, number> = {}
            const primary = await wcdbService.execQuery(
                'sns',
                null,
                "SELECT user_name AS username, COUNT(1) AS total FROM SnsTimeLine WHERE user_name IS NOT NULL AND user_name <> '' GROUP BY user_name"
            )

            let rows = primary.rows
            if (!primary.success || !rows) {
                const fallback = await wcdbService.execQuery(
                    'sns',
                    null,
                    "SELECT userName AS username, COUNT(1) AS total FROM SnsTimeLine WHERE userName IS NOT NULL AND userName <> '' GROUP BY userName"
                )
                if (!fallback.success || !fallback.rows) {
                    return { success: false, error: primary.error || fallback.error || '获取朋友圈联系人条数失败' }
                }
                rows = fallback.rows
            }

            for (const row of rows) {
                const usernameRaw = row?.username ?? row?.user_name ?? row?.userName ?? ''
                const username = typeof usernameRaw === 'string' ? usernameRaw.trim() : String(usernameRaw || '').trim()
                if (!username) continue
                counts[username] = this.parseCountValue(row)
            }
            return { success: true, data: counts }
        } catch (e) {
            return { success: false, error: String(e) }
        }
    }

    private async getExportStatsFromTableCount(): Promise<{ totalPosts: number; totalFriends: number }> {
        let totalPosts = 0
        let totalFriends = 0

        const postCountResult = await wcdbService.execQuery('sns', null, 'SELECT COUNT(1) AS total FROM SnsTimeLine')
        if (postCountResult.success && postCountResult.rows && postCountResult.rows.length > 0) {
            totalPosts = this.parseCountValue(postCountResult.rows[0])
        }

        if (totalPosts > 0) {
            const friendCountPrimary = await wcdbService.execQuery(
                'sns',
                null,
                "SELECT COUNT(DISTINCT user_name) AS total FROM SnsTimeLine WHERE user_name IS NOT NULL AND user_name <> ''"
            )
            if (friendCountPrimary.success && friendCountPrimary.rows && friendCountPrimary.rows.length > 0) {
                totalFriends = this.parseCountValue(friendCountPrimary.rows[0])
            } else {
                const friendCountFallback = await wcdbService.execQuery(
                    'sns',
                    null,
                    "SELECT COUNT(DISTINCT userName) AS total FROM SnsTimeLine WHERE userName IS NOT NULL AND userName <> ''"
                )
                if (friendCountFallback.success && friendCountFallback.rows && friendCountFallback.rows.length > 0) {
                    totalFriends = this.parseCountValue(friendCountFallback.rows[0])
                }
            }
        }

        return { totalPosts, totalFriends }
    }

    async getExportStats(options?: {
        allowTimelineFallback?: boolean
        preferCache?: boolean
    }): Promise<{ success: boolean; data?: { totalPosts: number; totalFriends: number }; error?: string }> {
        const allowTimelineFallback = options?.allowTimelineFallback ?? true
        const preferCache = options?.preferCache ?? false
        const now = Date.now()

        try {
            if (preferCache && this.exportStatsCache && now - this.exportStatsCache.updatedAt <= this.exportStatsCacheTtlMs) {
                return {
                    success: true,
                    data: {
                        totalPosts: this.exportStatsCache.totalPosts,
                        totalFriends: this.exportStatsCache.totalFriends
                    }
                }
            }

            let { totalPosts, totalFriends } = await this.getExportStatsFromTableCount()

            // 某些环境下 SnsTimeLine 统计查询会返回 0，这里在允许时回退到与导出同源的 timeline 接口统计。
            if (
                allowTimelineFallback &&
                (totalPosts <= 0 || totalFriends <= 0) &&
                now - this.lastTimelineFallbackAt >= this.timelineFallbackCooldownMs
            ) {
                this.lastTimelineFallbackAt = now
                const timelineStats = await this.getExportStatsFromTimeline()
                if (timelineStats.totalPosts > 0) {
                    totalPosts = timelineStats.totalPosts
                }
                if (timelineStats.totalFriends > 0) {
                    totalFriends = timelineStats.totalFriends
                }
            }

            this.exportStatsCache = {
                totalPosts,
                totalFriends,
                updatedAt: Date.now()
            }

            return { success: true, data: { totalPosts, totalFriends } }
        } catch (e) {
            if (this.exportStatsCache) {
                return {
                    success: true,
                    data: {
                        totalPosts: this.exportStatsCache.totalPosts,
                        totalFriends: this.exportStatsCache.totalFriends
                    }
                }
            }
            return { success: false, error: String(e) }
        }
    }

    async getExportStatsFast(): Promise<{ success: boolean; data?: { totalPosts: number; totalFriends: number }; error?: string }> {
        return this.getExportStats({
            allowTimelineFallback: false,
            preferCache: true
        })
    }

    // 安装朋友圈删除拦截
    async installSnsBlockDeleteTrigger(): Promise<{ success: boolean; alreadyInstalled?: boolean; error?: string }> {
        return wcdbService.installSnsBlockDeleteTrigger()
    }

    // 卸载朋友圈删除拦截
    async uninstallSnsBlockDeleteTrigger(): Promise<{ success: boolean; error?: string }> {
        return wcdbService.uninstallSnsBlockDeleteTrigger()
    }

    // 查询朋友圈删除拦截是否已安装
    async checkSnsBlockDeleteTrigger(): Promise<{ success: boolean; installed?: boolean; error?: string }> {
        return wcdbService.checkSnsBlockDeleteTrigger()
    }

    // 从数据库直接删除朋友圈记录
    async deleteSnsPost(postId: string): Promise<{ success: boolean; error?: string }> {
        return wcdbService.deleteSnsPost(postId)
    }

    /**
     * 补全 DLL 返回的评论中缺失的 refNickname
     * DLL 返回的 refCommentId 是被回复评论的 cmtid
     * 评论按 cmtid 从小到大排列，cmtid 从 1 开始递增
     */
    private fixCommentRefs(comments: any[]): any[] {
        if (!comments || comments.length === 0) return []

        // DLL 现在返回完整的评论数据（含 emojis、refNickname）
        // 此处做最终的格式化和兜底补全
        const idToNickname = new Map<string, string>()
        comments.forEach((c, idx) => {
            if (c.id) idToNickname.set(c.id, c.nickname || '')
            // 兜底：按索引映射（部分旧数据 id 可能为空）
            idToNickname.set(String(idx + 1), c.nickname || '')
        })

        return comments.map((c) => {
            const refId = c.refCommentId
            let refNickname = c.refNickname || ''

            if (refId && refId !== '0' && refId !== '' && !refNickname) {
                refNickname = idToNickname.get(refId) || ''
            }

            // 处理 emojis：过滤掉空的 url 和 encryptUrl
            const emojis = (c.emojis || [])
                .filter((e: any) => e.url || e.encryptUrl)
                .map((e: any) => ({
                    url: (e.url || '').replace(/&amp;/g, '&'),
                    md5: e.md5 || '',
                    width: e.width || 0,
                    height: e.height || 0,
                    encryptUrl: e.encryptUrl ? e.encryptUrl.replace(/&amp;/g, '&') : undefined,
                    aesKey: e.aesKey || undefined
                }))

            return {
                id: c.id || '',
                nickname: c.nickname || '',
                content: c.content || '',
                refCommentId: (refId === '0') ? '' : (refId || ''),
                refNickname,
                emojis: emojis.length > 0 ? emojis : undefined
            }
        })
    }

    async getTimeline(limit: number = 20, offset: number = 0, usernames?: string[], keyword?: string, startTime?: number, endTime?: number): Promise<{ success: boolean; timeline?: SnsPost[]; error?: string }> {
        const result = await wcdbService.getSnsTimeline(limit, offset, usernames, keyword, startTime, endTime)
        if (!result.success || !result.timeline || result.timeline.length === 0) return result

        // 诊断：测试 execQuery 查 content 字段
        try {
            const testResult = await wcdbService.execQuery('sns', null, 'SELECT tid, CAST(content AS TEXT) as ct, typeof(content) as ctype FROM SnsTimeLine ORDER BY tid DESC LIMIT 1')
            if (testResult.success && testResult.rows?.[0]) {
                const r = testResult.rows[0]
                console.log('[SnsService] execQuery 诊断: ctype=', r.ctype, 'ct长度=', r.ct?.length, 'ct前200=', r.ct?.substring(0, 200))
                console.log('[SnsService] ct包含CommentUserList:', r.ct?.includes('CommentUserList'))
            } else {
                console.log('[SnsService] execQuery 诊断失败:', testResult.error)
            }
        } catch (e) {
            console.log('[SnsService] execQuery 诊断异常:', e)
        }

        const enrichedTimeline = result.timeline.map((post: any) => {
            const contact = this.contactCache.get(post.username)
            const isVideoPost = post.type === 15
            const videoKey = extractVideoKey(post.rawXml || '')

            const fixedMedia = (post.media || []).map((m: any) => ({
                url: fixSnsUrl(m.url, m.token, isVideoPost),
                thumb: fixSnsUrl(m.thumb, m.token, false),
                md5: m.md5,
                token: m.token,
                key: isVideoPost ? (videoKey || m.key) : m.key,
                encIdx: m.encIdx || m.enc_idx,
                livePhoto: m.livePhoto ? {
                    ...m.livePhoto,
                    url: fixSnsUrl(m.livePhoto.url, m.livePhoto.token, true),
                    thumb: fixSnsUrl(m.livePhoto.thumb, m.livePhoto.token, false),
                    token: m.livePhoto.token,
                    key: videoKey || m.livePhoto.key || m.key,
                    encIdx: m.livePhoto.encIdx || m.livePhoto.enc_idx
                } : undefined
            }))

            // DLL 已返回完整评论数据（含 emojis、refNickname）
            // 如果 DLL 评论缺少表情包信息，回退到从 rawXml 重新解析
            const dllComments: any[] = post.comments || []
            const hasEmojisInDll = dllComments.some((c: any) => c.emojis && c.emojis.length > 0)
            const rawXml = post.rawXml || ''

            let finalComments: any[]
            if (dllComments.length > 0 && (hasEmojisInDll || !rawXml)) {
                // DLL 数据完整，直接使用
                finalComments = this.fixCommentRefs(dllComments)
            } else if (rawXml) {
                // 回退：从 rawXml 重新解析（兼容旧版 DLL）
                const xmlComments = parseCommentsFromXml(rawXml)
                finalComments = xmlComments.length > 0 ? xmlComments : this.fixCommentRefs(dllComments)
            } else {
                finalComments = this.fixCommentRefs(dllComments)
            }

            return {
                ...post,
                avatarUrl: contact?.avatarUrl,
                nickname: post.nickname || contact?.displayName || post.username,
                media: fixedMedia,
                comments: finalComments
            }
        })

        return { ...result, timeline: enrichedTimeline }
    }

    async debugResource(url: string): Promise<{ success: boolean; status?: number; headers?: any; error?: string }> {
        return new Promise((resolve) => {
            try {
                const https = require('https')
                const urlObj = new URL(url)

                const options = {
                    hostname: urlObj.hostname,
                    path: urlObj.pathname + urlObj.search,
                    method: 'GET',
                    headers: {
                        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36 MicroMessenger/7.0.20.1781(0x6700143B) WindowsWechat(0x63090719) XWEB/8351',
                        'Accept': 'image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8',
                        'Accept-Encoding': 'gzip, deflate, br',
                        'Accept-Language': 'zh-CN,zh;q=0.9',
                        'Connection': 'keep-alive',
                        'Range': 'bytes=0-10'
                    }
                }

                const req = https.request(options, (res: any) => {
                    resolve({
                        success: true,
                        status: res.statusCode,
                        headers: {
                            'x-enc': res.headers['x-enc'],
                            'x-time': res.headers['x-time'],
                            'content-length': res.headers['content-length'],
                            'content-type': res.headers['content-type']
                        }
                    })
                    req.destroy()
                })

                req.on('error', (e: any) => resolve({ success: false, error: e.message }))
                req.end()
            } catch (e: any) {
                resolve({ success: false, error: e.message })
            }
        })
    }



    async proxyImage(url: string, key?: string | number): Promise<{ success: boolean; dataUrl?: string; videoPath?: string; error?: string }> {
        if (!url) return { success: false, error: 'url 不能为空' }
        const cacheKey = `${url}|${key ?? ''}`

        if (this.imageCache.has(cacheKey)) {
            return { success: true, dataUrl: this.imageCache.get(cacheKey) }
        }

        const result = await this.fetchAndDecryptImage(url, key)
        if (result.success) {
            // 如果是视频，返回本地文件路径 (需配合 webSecurity: false 或自定义协议)
            if (result.contentType?.startsWith('video/')) {
                // Return cachePath directly for video
                // 注意：fetchAndDecryptImage 需要修改以返回 cachePath
                return { success: true, videoPath: result.cachePath }
            }

            if (result.data && result.contentType) {
                const dataUrl = `data:${result.contentType};base64,${result.data.toString('base64')}`
                this.imageCache.set(cacheKey, dataUrl)
                return { success: true, dataUrl }
            }
        }
        return { success: false, error: result.error }
    }

    async downloadImage(url: string, key?: string | number): Promise<{ success: boolean; data?: Buffer; contentType?: string; error?: string }> {
        return this.fetchAndDecryptImage(url, key)
    }

    /**
     * 导出朋友圈动态
     * 支持筛选条件（用户名、关键词）和媒体文件导出
     */
    async exportTimeline(options: {
        outputDir: string
        format: 'json' | 'html'
        usernames?: string[]
        keyword?: string
        exportMedia?: boolean
        startTime?: number
        endTime?: number
    }, progressCallback?: (progress: { current: number; total: number; status: string }) => void): Promise<{ success: boolean; filePath?: string; postCount?: number; mediaCount?: number; error?: string }> {
        const { outputDir, format, usernames, keyword, exportMedia = false, startTime, endTime } = options

        try {
            // 确保输出目录存在
            if (!existsSync(outputDir)) {
                mkdirSync(outputDir, { recursive: true })
            }

            // 1. 分页加载全部帖子
            const allPosts: SnsPost[] = []
            const pageSize = 50
            let endTs: number | undefined = endTime  // 使用 endTime 作为分页起始上界
            let hasMore = true

            progressCallback?.({ current: 0, total: 0, status: '正在加载朋友圈数据...' })

            while (hasMore) {
                const result = await this.getTimeline(pageSize, 0, usernames, keyword, startTime, endTs)
                if (result.success && result.timeline && result.timeline.length > 0) {
                    allPosts.push(...result.timeline)
                    // 下一页的 endTs 为当前最后一条帖子的时间 - 1
                    const lastTs = result.timeline[result.timeline.length - 1].createTime - 1
                    endTs = lastTs
                    hasMore = result.timeline.length >= pageSize
                    // 如果已经低于 startTime，提前终止
                    if (startTime && lastTs < startTime) {
                        hasMore = false
                    }
                    progressCallback?.({ current: allPosts.length, total: 0, status: `已加载 ${allPosts.length} 条动态...` })
                } else {
                    hasMore = false
                }
            }

            if (allPosts.length === 0) {
                return { success: true, filePath: '', postCount: 0, mediaCount: 0 }
            }

            progressCallback?.({ current: 0, total: allPosts.length, status: `共 ${allPosts.length} 条动态，准备导出...` })

            // 2. 如果需要导出媒体，创建 media 子目录并下载
            let mediaCount = 0
            const mediaDir = join(outputDir, 'media')

            if (exportMedia) {
                if (!existsSync(mediaDir)) {
                    mkdirSync(mediaDir, { recursive: true })
                }

                // 收集所有媒体下载任务
                const mediaTasks: { media: SnsMedia; postId: string; mi: number }[] = []
                for (const post of allPosts) {
                    post.media.forEach((media, mi) => mediaTasks.push({ media, postId: post.id, mi }))
                }

                // 并发下载（5路）
                let done = 0
                const concurrency = 5
                const runTask = async (task: typeof mediaTasks[0]) => {
                    const { media, postId, mi } = task
                    try {
                        const isVideo = isVideoUrl(media.url)
                        const ext = isVideo ? 'mp4' : 'jpg'
                        const fileName = `${postId}_${mi}.${ext}`
                        const filePath = join(mediaDir, fileName)

                        if (existsSync(filePath)) {
                            ;(media as any).localPath = `media/${fileName}`
                            mediaCount++
                        } else {
                            const result = await this.fetchAndDecryptImage(media.url, media.key)
                            if (result.success && result.data) {
                                await writeFile(filePath, result.data)
                                ;(media as any).localPath = `media/${fileName}`
                                mediaCount++
                            } else if (result.success && result.cachePath) {
                                const cachedData = await readFile(result.cachePath)
                                await writeFile(filePath, cachedData)
                                ;(media as any).localPath = `media/${fileName}`
                                mediaCount++
                            }
                        }
                    } catch (e) {
                        console.warn(`[SnsExport] 媒体下载失败: ${task.media.url}`, e)
                    }
                    done++
                    progressCallback?.({ current: done, total: mediaTasks.length, status: `正在下载媒体 (${done}/${mediaTasks.length})...` })
                }

                // 控制并发的执行器
                const queue = [...mediaTasks]
                const workers = Array.from({ length: Math.min(concurrency, queue.length) }, async () => {
                    while (queue.length > 0) {
                        const task = queue.shift()!
                        await runTask(task)
                    }
                })
                await Promise.all(workers)
            }

            // 2.5 下载头像
            const avatarMap = new Map<string, string>()
            if (format === 'html') {
                if (!existsSync(mediaDir)) mkdirSync(mediaDir, { recursive: true })
                const uniqueUsers = [...new Map(allPosts.filter(p => p.avatarUrl).map(p => [p.username, p])).values()]
                let avatarDone = 0
                const avatarQueue = [...uniqueUsers]
                const avatarWorkers = Array.from({ length: Math.min(5, avatarQueue.length) }, async () => {
                    while (avatarQueue.length > 0) {
                        const post = avatarQueue.shift()!
                        try {
                            const fileName = `avatar_${crypto.createHash('md5').update(post.username).digest('hex').slice(0, 8)}.jpg`
                            const filePath = join(mediaDir, fileName)
                            if (existsSync(filePath)) {
                                avatarMap.set(post.username, `media/${fileName}`)
                            } else {
                                const result = await this.fetchAndDecryptImage(post.avatarUrl!)
                                if (result.success && result.data) {
                                    await writeFile(filePath, result.data)
                                    avatarMap.set(post.username, `media/${fileName}`)
                                }
                            }
                        } catch (e) { /* 头像下载失败不影响导出 */ }
                        avatarDone++
                        progressCallback?.({ current: avatarDone, total: uniqueUsers.length, status: `正在下载头像 (${avatarDone}/${uniqueUsers.length})...` })
                    }
                })
                await Promise.all(avatarWorkers)
            }

            // 3. 生成输出文件
            const timestamp = new Date().toISOString().replace(/[:.]/g, '-').slice(0, 19)
            let outputFilePath: string

            if (format === 'json') {
                outputFilePath = join(outputDir, `朋友圈导出_${timestamp}.json`)
                const exportData = {
                    exportTime: new Date().toISOString(),
                    totalPosts: allPosts.length,
                    filters: {
                        usernames: usernames || [],
                        keyword: keyword || ''
                    },
                    posts: allPosts.map(p => ({
                        id: p.id,
                        username: p.username,
                        nickname: p.nickname,
                        createTime: p.createTime,
                        createTimeStr: new Date(p.createTime * 1000).toLocaleString('zh-CN'),
                        contentDesc: p.contentDesc,
                        type: p.type,
                        media: p.media.map(m => ({
                            url: m.url,
                            thumb: m.thumb,
                            localPath: (m as any).localPath || undefined
                        })),
                        likes: p.likes,
                        comments: p.comments,
                        linkTitle: (p as any).linkTitle,
                        linkUrl: (p as any).linkUrl
                    }))
                }
                await writeFile(outputFilePath, JSON.stringify(exportData, null, 2), 'utf-8')
            } else {
                // HTML 格式
                outputFilePath = join(outputDir, `朋友圈导出_${timestamp}.html`)
                const html = this.generateHtml(allPosts, { usernames, keyword }, avatarMap)
                await writeFile(outputFilePath, html, 'utf-8')
            }

            progressCallback?.({ current: allPosts.length, total: allPosts.length, status: '导出完成！' })

            return { success: true, filePath: outputFilePath, postCount: allPosts.length, mediaCount }
        } catch (e: any) {
            console.error('[SnsExport] 导出失败:', e)
            return { success: false, error: e.message || String(e) }
        }
    }

    /**
     * 生成朋友圈 HTML 导出文件
     */
    private generateHtml(posts: SnsPost[], filters: { usernames?: string[]; keyword?: string }, avatarMap?: Map<string, string>): string {
        const escapeHtml = (str: string) => str
            .replace(/&/g, '&amp;')
            .replace(/</g, '&lt;')
            .replace(/>/g, '&gt;')
            .replace(/"/g, '&quot;')
            .replace(/\n/g, '<br>')

        const formatTime = (ts: number) => {
            const d = new Date(ts * 1000)
            const now = new Date()
            const isCurrentYear = d.getFullYear() === now.getFullYear()
            const pad = (n: number) => String(n).padStart(2, '0')
            const timeStr = `${pad(d.getHours())}:${pad(d.getMinutes())}`
            const m = d.getMonth() + 1, day = d.getDate()
            return isCurrentYear ? `${m}月${day}日 ${timeStr}` : `${d.getFullYear()}年${m}月${day}日 ${timeStr}`
        }

        // 生成头像首字母
        const avatarLetter = (name: string) => {
            const ch = name.charAt(0)
            return escapeHtml(ch || '?')
        }

        let filterInfo = ''
        if (filters.keyword) filterInfo += `关键词: "${escapeHtml(filters.keyword)}" `
        if (filters.usernames && filters.usernames.length > 0) filterInfo += `筛选用户: ${filters.usernames.length} 人`

        const postsHtml = posts.map(post => {
            const mediaCount = post.media.length
            const gridClass = mediaCount === 1 ? 'grid-1' : mediaCount === 2 || mediaCount === 4 ? 'grid-2' : 'grid-3'

            const mediaHtml = post.media.map((m, mi) => {
                const localPath = (m as any).localPath
                if (localPath) {
                    if (isVideoUrl(m.url)) {
                        return `<div class="mi"><video src="${escapeHtml(localPath)}" controls preload="metadata"></video></div>`
                    }
                    return `<div class="mi"><img src="${escapeHtml(localPath)}" loading="lazy" onclick="openLb(this.src)" alt=""></div>`
                }
                return `<div class="mi ml"><a href="${escapeHtml(m.url)}" target="_blank">查看媒体</a></div>`
            }).join('')

            const linkHtml = post.linkTitle && post.linkUrl
                ? `<a class="lk" href="${escapeHtml(post.linkUrl)}" target="_blank"><span class="lk-t">${escapeHtml(post.linkTitle)}</span><span class="lk-a">›</span></a>`
                : ''

            const likesHtml = post.likes.length > 0
                ? `<div class="interactions"><div class="likes">♥ ${post.likes.map(l => `<span>${escapeHtml(l)}</span>`).join('、')}</div></div>`
                : ''

            const commentsHtml = post.comments.length > 0
                ? `<div class="interactions${post.likes.length > 0 ? ' cmt-border' : ''}"><div class="cmts">${post.comments.map(c => {
                    const ref = c.refNickname ? `<span class="re">回复</span><b>${escapeHtml(c.refNickname)}</b>` : ''
                    return `<div class="cmt"><b>${escapeHtml(c.nickname)}</b>${ref}：${escapeHtml(c.content)}</div>`
                }).join('')}</div></div>`
                : ''

            const avatarSrc = avatarMap?.get(post.username)
            const avatarHtml = avatarSrc
                ? `<div class="avatar"><img src="${escapeHtml(avatarSrc)}" alt=""></div>`
                : `<div class="avatar">${avatarLetter(post.nickname)}</div>`

            return `<div class="post">
${avatarHtml}
<div class="body">
<div class="hd"><span class="nick">${escapeHtml(post.nickname)}</span><span class="tm">${formatTime(post.createTime)}</span></div>
${post.contentDesc ? `<div class="txt">${escapeHtml(post.contentDesc)}</div>` : ''}
${mediaHtml ? `<div class="mg ${gridClass}">${mediaHtml}</div>` : ''}
${linkHtml}
${likesHtml}
${commentsHtml}
</div></div>`
        }).join('\n')

        return `<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>朋友圈导出</title>
<style>
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--t1);line-height:1.6;-webkit-font-smoothing:antialiased}
:root{--bg:#F0EEE9;--card:rgba(255,255,255,.92);--t1:#3d3d3d;--t2:#666;--t3:#999;--accent:#8B7355;--border:rgba(0,0,0,.08);--bg3:rgba(0,0,0,.03)}
@media(prefers-color-scheme:dark){:root{--bg:#1a1a1a;--card:rgba(40,40,40,.85);--t1:#e0e0e0;--t2:#aaa;--t3:#777;--accent:#c4a882;--border:rgba(255,255,255,.1);--bg3:rgba(255,255,255,.06)}}
.container{max-width:800px;margin:0 auto;padding:20px 24px 60px}

/* 页面标题 */
.feed-hd{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;padding:0 4px}
.feed-hd h2{font-size:20px;font-weight:700}
.feed-hd .info{font-size:12px;color:var(--t3)}

/* 帖子卡片 - 头像+内容双列 */
.post{background:var(--card);border-radius:16px;border:1px solid var(--border);padding:20px;margin-bottom:24px;display:flex;gap:16px;box-shadow:0 2px 8px rgba(0,0,0,.02);transition:transform .2s,box-shadow .2s}
.post:hover{transform:translateY(-2px);box-shadow:0 8px 16px rgba(0,0,0,.06)}
.avatar{width:48px;height:48px;border-radius:12px;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:600;flex-shrink:0;overflow:hidden}
.avatar img{width:100%;height:100%;object-fit:cover}
.body{flex:1;min-width:0}
.hd{display:flex;flex-direction:column;margin-bottom:8px}
.nick{font-size:15px;font-weight:700;color:var(--accent);margin-bottom:2px}
.tm{font-size:12px;color:var(--t3)}
.txt{font-size:15px;line-height:1.6;white-space:pre-wrap;word-break:break-word;margin-bottom:12px}

/* 媒体网格 */
.mg{display:grid;gap:6px;margin-bottom:12px;max-width:320px}
.grid-1{max-width:300px}
.grid-1 .mi{border-radius:12px}
.grid-1 .mi img{aspect-ratio:auto;max-height:480px;object-fit:contain;background:var(--bg3)}
.grid-2{grid-template-columns:1fr 1fr}
.grid-3{grid-template-columns:1fr 1fr 1fr}
.mi{overflow:hidden;border-radius:12px;background:var(--bg3);position:relative;aspect-ratio:1}
.mi img{width:100%;height:100%;object-fit:cover;display:block;cursor:zoom-in;transition:opacity .2s}
.mi img:hover{opacity:.9}
.mi video{width:100%;height:100%;object-fit:cover;display:block;background:#000}
.ml{display:flex;align-items:center;justify-content:center}
.ml a{color:var(--accent);text-decoration:none;font-size:13px}

/* 链接卡片 */
.lk{display:flex;align-items:center;gap:10px;padding:10px;background:var(--bg3);border:1px solid var(--border);border-radius:12px;text-decoration:none;color:var(--t1);font-size:14px;margin-bottom:12px;transition:background .15s}
.lk:hover{background:var(--border)}
.lk-t{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600}
.lk-a{color:var(--t3);font-size:18px;flex-shrink:0}

/* 互动区域 */
.interactions{margin-top:12px;padding-top:12px;border-top:1px dashed var(--border);font-size:13px}
.interactions.cmt-border{border-top:none;padding-top:0;margin-top:8px}
.likes{color:var(--accent);font-weight:500;line-height:1.8}
.cmts{background:var(--bg3);border-radius:8px;padding:8px 12px;line-height:1.4}
.cmt{margin-bottom:4px;color:var(--t2)}
.cmt:last-child{margin-bottom:0}
.cmt b{color:var(--accent);font-weight:500}
.re{color:var(--t3);margin:0 4px;font-size:12px}

/* 灯箱 */
.lb{display:none;position:fixed;inset:0;background:rgba(0,0,0,.92);z-index:9999;align-items:center;justify-content:center;cursor:zoom-out}
.lb.on{display:flex}
.lb img{max-width:92vw;max-height:92vh;object-fit:contain;border-radius:4px}

/* 回到顶部 */
.btt{position:fixed;right:24px;bottom:32px;width:44px;height:44px;border-radius:50%;background:var(--card);box-shadow:0 2px 12px rgba(0,0,0,.12);border:1px solid var(--border);cursor:pointer;font-size:18px;display:none;align-items:center;justify-content:center;z-index:100;color:var(--t2)}
.btt:hover{transform:scale(1.1)}
.btt.show{display:flex}

/* 页脚 */
.ft{text-align:center;padding:32px 0 24px;font-size:12px;color:var(--t3)}
</style>
</head>
<body>
<div class="container">
    <div class="feed-hd"><h2>朋友圈</h2><span class="info">共 ${posts.length} 条${filterInfo ? ` · ${filterInfo}` : ''}</span></div>
    ${postsHtml}
    <div class="ft">由 WeFlow 导出 · ${new Date().toLocaleString('zh-CN')}</div>
</div>
<div class="lb" id="lb" onclick="closeLb()"><img id="lbi" src=""></div>
<button class="btt" id="btt" onclick="scrollTo({top:0,behavior:'smooth'})">↑</button>
<script>
function openLb(s){document.getElementById('lbi').src=s;document.getElementById('lb').classList.add('on');document.body.style.overflow='hidden'}
function closeLb(){document.getElementById('lb').classList.remove('on');document.body.style.overflow=''}
document.addEventListener('keydown',function(e){if(e.key==='Escape')closeLb()})
window.addEventListener('scroll',function(){document.getElementById('btt').classList.toggle('show',window.scrollY>600)})
</script>
</body>
</html>`
    }

    private async fetchAndDecryptImage(url: string, key?: string | number): Promise<{ success: boolean; data?: Buffer; contentType?: string; cachePath?: string; error?: string }> {
        if (!url) return { success: false, error: 'url 不能为空' }

        const isVideo = isVideoUrl(url)
        const cachePath = this.getCacheFilePath(url)

        // 1. 尝试从磁盘缓存读取
        if (existsSync(cachePath)) {
            try {
                // 对于视频，不读取整个文件到内存，只确认存在即可
                if (isVideo) {
                    return { success: true, cachePath, contentType: 'video/mp4' }
                }

                const data = await readFile(cachePath)
                const contentType = detectImageMime(data)
                return { success: true, data, contentType, cachePath }
            } catch (e) {
                console.warn(`[SnsService] 读取缓存失败: ${cachePath}`, e)
            }
        }

        if (isVideo) {
            // 视频专用下载逻辑 (下载 -> 解密 -> 缓存)
            return new Promise(async (resolve) => {
                const tmpPath = join(require('os').tmpdir(), `sns_video_${Date.now()}_${Math.random().toString(36).slice(2)}.enc`)

                try {
                    const https = require('https')
                    const urlObj = new URL(url)
                    const fs = require('fs')

                    const fileStream = fs.createWriteStream(tmpPath)

                    const options = {
                        hostname: urlObj.hostname,
                        path: urlObj.pathname + urlObj.search,
                        method: 'GET',
                        headers: {
                            'User-Agent': 'MicroMessenger Client',
                            'Accept': '*/*',
                            // 'Accept-Encoding': 'gzip, deflate, br', // 视频流通常不压缩，去掉以免 stream 处理复杂
                            'Connection': 'keep-alive'
                        }
                    }

                    const req = https.request(options, (res: any) => {
                        if (res.statusCode !== 200 && res.statusCode !== 206) {
                            fileStream.close()
                            fs.unlink(tmpPath, () => { }) // 删除临时文件
                            resolve({ success: false, error: `HTTP ${res.statusCode}` })
                            return
                        }

                        res.pipe(fileStream)
                        fileStream.on('finish', async () => {
                            fileStream.close()

                            try {
                                const encryptedBuffer = await readFile(tmpPath)
                                const raw = encryptedBuffer // 引用，方便后续操作


                                if (key && String(key).trim().length > 0) {
                                    try {
                                        const keyText = String(key).trim()
                                        let keystream: Buffer

                                        try {
                                            const wasmService = WasmService.getInstance()
                                            // 只需要前 128KB (131072 bytes) 用于解密头部
                                            keystream = await wasmService.getKeystream(keyText, 131072)
                                        } catch (wasmErr) {
                                            // 打包漏带 wasm 或 wasm 初始化异常时，回退到纯 TS ISAAC64
                                            const isaac = new Isaac64(keyText)
                                            keystream = isaac.generateKeystreamBE(131072)
                                        }

                                        const decryptLen = Math.min(keystream.length, raw.length)

                                        // XOR 解密
                                        for (let i = 0; i < decryptLen; i++) {
                                            raw[i] ^= keystream[i]
                                        }

                                        // 验证 MP4 签名 ('ftyp' at offset 4)
                                        const ftyp = raw.subarray(4, 8).toString('ascii')
                                        if (ftyp !== 'ftyp') {
                                            // 可以在此处记录解密可能失败的标记，但不打印详细 hex
                                        }
                                    } catch (err) {
                                        console.error(`[SnsService] 视频解密出错: ${err}`)
                                    }
                                }

                                // 写入最终缓存 (覆盖)
                                await writeFile(cachePath, raw)

                                // 删除临时文件
                                try { await import('fs/promises').then(fs => fs.unlink(tmpPath)) } catch (e) { }

                                resolve({ success: true, data: raw, contentType: 'video/mp4', cachePath })
                            } catch (e: any) {
                                console.error(`[SnsService] 视频处理失败:`, e)
                                resolve({ success: false, error: e.message })
                            }
                        })
                    })

                    req.on('error', (e: any) => {
                        fs.unlink(tmpPath, () => { })
                        resolve({ success: false, error: e.message })
                    })

                    req.setTimeout(15000, () => {
                        req.destroy()
                        fs.unlink(tmpPath, () => { })
                        resolve({ success: false, error: '请求超时' })
                    })

                    req.end()

                } catch (e: any) {
                    resolve({ success: false, error: e.message })
                }
            })
        }

        // 图片逻辑 (保持流式处理)
        return new Promise((resolve) => {
            try {
                const https = require('https')
                const zlib = require('zlib')
                const urlObj = new URL(url)

                const options = {
                    hostname: urlObj.hostname,
                    path: urlObj.pathname + urlObj.search,
                    method: 'GET',
                    headers: {
                        'User-Agent': 'MicroMessenger Client',
                        'Accept': '*/*',
                        'Accept-Encoding': 'gzip, deflate, br',
                        'Accept-Language': 'zh-CN,zh;q=0.9',
                        'Connection': 'keep-alive'
                    }
                }

                const req = https.request(options, (res: any) => {
                    if (res.statusCode !== 200 && res.statusCode !== 206) {
                        resolve({ success: false, error: `HTTP ${res.statusCode}` })
                        return
                    }

                    const chunks: Buffer[] = []
                    let stream = res

                    const encoding = res.headers['content-encoding']
                    if (encoding === 'gzip') stream = res.pipe(zlib.createGunzip())
                    else if (encoding === 'deflate') stream = res.pipe(zlib.createInflate())
                    else if (encoding === 'br') stream = res.pipe(zlib.createBrotliDecompress())

                    stream.on('data', (chunk: Buffer) => chunks.push(chunk))
                    stream.on('end', async () => {
                        const raw = Buffer.concat(chunks)
                        const xEnc = String(res.headers['x-enc'] || '').trim()

                        let decoded = raw

                        // 图片逻辑
                        const shouldDecrypt = (xEnc === '1' || !!key) && key !== undefined && key !== null && String(key).trim().length > 0
                        if (shouldDecrypt) {
                            try {
                                const keyStr = String(key).trim()
                                if (/^\d+$/.test(keyStr)) {
                                    // 使用 WASM 版本的 Isaac64 解密图片
                                    // 修正逻辑：使用带 reverse 且修正了 8字节对齐偏移的 getKeystream
                                    const wasmService = WasmService.getInstance()
                                    const keystream = await wasmService.getKeystream(keyStr, raw.length)

                                    const decrypted = Buffer.allocUnsafe(raw.length)
                                    for (let i = 0; i < raw.length; i++) {
                                        decrypted[i] = raw[i] ^ keystream[i]
                                    }

                                    decoded = decrypted
                                }
                            } catch (e) {
                                console.error('[SnsService] TS Decrypt Error:', e)
                            }
                        }

                        // 写入磁盘缓存
                        try {
                            await writeFile(cachePath, decoded)
                        } catch (e) {
                            console.warn(`[SnsService] 写入缓存失败: ${cachePath}`, e)
                        }

                        const contentType = detectImageMime(decoded, (res.headers['content-type'] || 'image/jpeg') as string)
                        resolve({ success: true, data: decoded, contentType, cachePath })
                    })
                    stream.on('error', (e: any) => resolve({ success: false, error: e.message }))
                })

                req.on('error', (e: any) => resolve({ success: false, error: e.message }))
                req.setTimeout(15000, () => {
                    req.destroy()
                    resolve({ success: false, error: '请求超时' })
                })
                req.end()
            } catch (e: any) {
                resolve({ success: false, error: e.message })
            }
        })
    }

    /** 判断 buffer 是否为有效图片头 */
    private isValidImageBuffer(buf: Buffer): boolean {
        if (!buf || buf.length < 12) return false
        if (buf[0] === 0x47 && buf[1] === 0x49 && buf[2] === 0x46) return true
        if (buf[0] === 0x89 && buf[1] === 0x50 && buf[2] === 0x4E && buf[3] === 0x47) return true
        if (buf[0] === 0xFF && buf[1] === 0xD8 && buf[2] === 0xFF) return true
        if (buf[0] === 0x52 && buf[1] === 0x49 && buf[2] === 0x46 && buf[3] === 0x46
            && buf[8] === 0x57 && buf[9] === 0x45 && buf[10] === 0x42 && buf[11] === 0x50) return true
        return false
    }

    /** 根据图片头返回扩展名 */
    private getImageExtFromBuffer(buf: Buffer): string {
        if (buf[0] === 0x47 && buf[1] === 0x49 && buf[2] === 0x46) return '.gif'
        if (buf[0] === 0x89 && buf[1] === 0x50 && buf[2] === 0x4E && buf[3] === 0x47) return '.png'
        if (buf[0] === 0xFF && buf[1] === 0xD8 && buf[2] === 0xFF) return '.jpg'
        if (buf.length >= 12 && buf[0] === 0x52 && buf[1] === 0x49 && buf[2] === 0x46 && buf[3] === 0x46
            && buf[8] === 0x57 && buf[9] === 0x45 && buf[10] === 0x42 && buf[11] === 0x50) return '.webp'
        return '.gif'
    }

    /** 构建多种密钥派生方式 */
    private buildKeyTries(aesKey: string): { name: string; key: Buffer }[] {
        const keyTries: { name: string; key: Buffer }[] = []
        const hexStr = aesKey.replace(/\s/g, '')
        if (hexStr.length >= 32 && /^[0-9a-fA-F]+$/.test(hexStr)) {
            try {
                const keyBuf = Buffer.from(hexStr.slice(0, 32), 'hex')
                if (keyBuf.length === 16) keyTries.push({ name: 'hex-decode', key: keyBuf })
            } catch { }
            const rawKey = Buffer.from(hexStr.slice(0, 32), 'utf8')
            if (rawKey.length === 32) keyTries.push({ name: 'raw-hex-str-32', key: rawKey })
        }
        if (aesKey.length >= 16) {
            keyTries.push({ name: 'utf8-16', key: Buffer.from(aesKey, 'utf8').subarray(0, 16) })
        }
        keyTries.push({ name: 'md5', key: crypto.createHash('md5').update(aesKey).digest() })
        try {
            const b64Buf = Buffer.from(aesKey, 'base64')
            if (b64Buf.length >= 16) keyTries.push({ name: 'base64', key: b64Buf.subarray(0, 16) })
        } catch { }
        return keyTries
    }

    /** 构建多种 GCM 数据布局 */
    private buildGcmLayouts(encData: Buffer): { nonce: Buffer; ciphertext: Buffer; tag: Buffer }[] {
        const layouts: { nonce: Buffer; ciphertext: Buffer; tag: Buffer }[] = []
        // 格式 A：GcmData 块格式
        if (encData.length > 63 && encData[0] === 0xAB && encData[8] === 0xAB && encData[9] === 0x00) {
            const payloadSize = encData.readUInt32LE(10)
            if (payloadSize > 16 && 63 + payloadSize <= encData.length) {
                const nonce = encData.subarray(19, 31)
                const payload = encData.subarray(63, 63 + payloadSize)
                layouts.push({ nonce, ciphertext: payload.subarray(0, payload.length - 16), tag: payload.subarray(payload.length - 16) })
            }
        }
        // 格式 B：尾部 [ciphertext][nonce 12B][tag 16B]
        if (encData.length > 28) {
            layouts.push({
                ciphertext: encData.subarray(0, encData.length - 28),
                nonce: encData.subarray(encData.length - 28, encData.length - 16),
                tag: encData.subarray(encData.length - 16)
            })
        }
        // 格式 C：前置 [nonce 12B][ciphertext][tag 16B]
        if (encData.length > 28) {
            layouts.push({
                nonce: encData.subarray(0, 12),
                ciphertext: encData.subarray(12, encData.length - 16),
                tag: encData.subarray(encData.length - 16)
            })
        }
        // 格式 D：零 nonce
        if (encData.length > 16) {
            layouts.push({
                nonce: Buffer.alloc(12, 0),
                ciphertext: encData.subarray(0, encData.length - 16),
                tag: encData.subarray(encData.length - 16)
            })
        }
        // 格式 E：[nonce 12B][tag 16B][ciphertext]
        if (encData.length > 28) {
            layouts.push({
                nonce: encData.subarray(0, 12),
                tag: encData.subarray(12, 28),
                ciphertext: encData.subarray(28)
            })
        }
        return layouts
    }

    /** 尝试 AES-GCM 解密 */
    private tryGcmDecrypt(key: Buffer, nonce: Buffer, ciphertext: Buffer, tag: Buffer): Buffer | null {
        try {
            const algo = key.length === 32 ? 'aes-256-gcm' : 'aes-128-gcm'
            const decipher = crypto.createDecipheriv(algo, key, nonce)
            decipher.setAuthTag(tag)
            const decrypted = Buffer.concat([decipher.update(ciphertext), decipher.final()])
            if (this.isValidImageBuffer(decrypted)) return decrypted
            for (const fn of [zlib.inflateSync, zlib.gunzipSync, zlib.unzipSync]) {
                try {
                    const d = fn(decrypted)
                    if (this.isValidImageBuffer(d)) return d
                } catch { }
            }
            return decrypted
        } catch {
            return null
        }
    }

    /**
     * 解密表情数据（多种算法 + 多种密钥派生）
     * 移植自 ciphertalk 的逆向实现
     */
    private decryptEmojiAes(encData: Buffer, aesKey: string): Buffer | null {
        if (encData.length <= 16) return null

        const keyTries = this.buildKeyTries(aesKey)
        const tag = encData.subarray(encData.length - 16)
        const ciphertext = encData.subarray(0, encData.length - 16)

        // 最高优先级：nonce-tail 格式 [ciphertext][nonce 12B][tag 16B]
        if (encData.length > 28) {
            const nonceTail = encData.subarray(encData.length - 28, encData.length - 16)
            const tagTail = encData.subarray(encData.length - 16)
            const cipherTail = encData.subarray(0, encData.length - 28)
            for (const { key } of keyTries) {
                if (key.length !== 16 && key.length !== 32) continue
                const result = this.tryGcmDecrypt(key, nonceTail, cipherTail, tagTail)
                if (result) return result
            }
        }

        // 次优先级：nonce = key 前 12 字节
        for (const { key } of keyTries) {
            if (key.length !== 16 && key.length !== 32) continue
            const nonce = key.subarray(0, 12)
            const result = this.tryGcmDecrypt(key, nonce, ciphertext, tag)
            if (result) return result
        }

        // 其他 GCM 布局
        const layouts = this.buildGcmLayouts(encData)
        for (const layout of layouts) {
            for (const { key } of keyTries) {
                if (key.length !== 16 && key.length !== 32) continue
                const result = this.tryGcmDecrypt(key, layout.nonce, layout.ciphertext, layout.tag)
                if (result) return result
            }
        }

        // 回退：AES-128-CBC / AES-128-ECB
        for (const { key } of keyTries) {
            if (key.length !== 16) continue
            // CBC：IV = key
            if (encData.length >= 16 && encData.length % 16 === 0) {
                try {
                    const dec = crypto.createDecipheriv('aes-128-cbc', key, key)
                    dec.setAutoPadding(true)
                    const result = Buffer.concat([dec.update(encData), dec.final()])
                    if (this.isValidImageBuffer(result)) return result
                    for (const fn of [zlib.inflateSync, zlib.gunzipSync]) {
                        try { const d = fn(result); if (this.isValidImageBuffer(d)) return d } catch { }
                    }
                } catch { }
            }
            // CBC：前 16 字节作为 IV
            if (encData.length > 32) {
                try {
                    const iv = encData.subarray(0, 16)
                    const dec = crypto.createDecipheriv('aes-128-cbc', key, iv)
                    dec.setAutoPadding(true)
                    const result = Buffer.concat([dec.update(encData.subarray(16)), dec.final()])
                    if (this.isValidImageBuffer(result)) return result
                } catch { }
            }
            // ECB
            try {
                const dec = crypto.createDecipheriv('aes-128-ecb', key, null)
                dec.setAutoPadding(true)
                const result = Buffer.concat([dec.update(encData), dec.final()])
                if (this.isValidImageBuffer(result)) return result
            } catch { }
        }

        return null
    }

    /** 下载原始数据到本地临时文件，支持重定向 */
    private doDownloadRaw(targetUrl: string, cacheKey: string, cacheDir: string): Promise<string | null> {
        return new Promise((resolve) => {
            try {
                const fs = require('fs')
                const https = require('https')
                const http = require('http')
                let fixedUrl = targetUrl.replace(/&amp;/g, '&')
                const urlObj = new URL(fixedUrl)
                const protocol = fixedUrl.startsWith('https') ? https : http

                const options = {
                    headers: {
                        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 MicroMessenger/7.0.20.1781(0x67001431)',
                        'Accept': '*/*',
                        'Connection': 'keep-alive'
                    },
                    rejectUnauthorized: false,
                    timeout: 15000
                }

                const request = protocol.get(fixedUrl, options, (response: any) => {
                    // 处理重定向
                    if ([301, 302, 303, 307].includes(response.statusCode)) {
                        const redirectUrl = response.headers.location
                        if (redirectUrl) {
                            const full = redirectUrl.startsWith('http') ? redirectUrl : `${urlObj.protocol}//${urlObj.host}${redirectUrl}`
                            this.doDownloadRaw(full, cacheKey, cacheDir).then(resolve)
                            return
                        }
                    }
                    if (response.statusCode !== 200) { resolve(null); return }

                    const chunks: Buffer[] = []
                    response.on('data', (chunk: Buffer) => chunks.push(chunk))
                    response.on('end', () => {
                        const buffer = Buffer.concat(chunks)
                        if (buffer.length === 0) { resolve(null); return }
                        const ext = this.isValidImageBuffer(buffer) ? this.getImageExtFromBuffer(buffer) : '.bin'
                        const filePath = join(cacheDir, `${cacheKey}${ext}`)
                        try {
                            fs.writeFileSync(filePath, buffer)
                            resolve(filePath)
                        } catch { resolve(null) }
                    })
                    response.on('error', () => resolve(null))
                })
                request.on('error', () => resolve(null))
                request.setTimeout(15000, () => { request.destroy(); resolve(null) })
            } catch { resolve(null) }
        })
    }

    /**
     * 下载朋友圈评论中的表情包（多种解密算法，移植自 ciphertalk）
     */
    async downloadSnsEmoji(url: string, encryptUrl?: string, aesKey?: string): Promise<{ success: boolean; localPath?: string; error?: string }> {
        if (!url && !encryptUrl) return { success: false, error: 'url 不能为空' }

        const fs = require('fs')
        const cacheKey = crypto.createHash('md5').update(url || encryptUrl!).digest('hex')
        const cachePath = this.configService.getCacheBasePath()
        const emojiDir = join(cachePath, 'sns_emoji_cache')
        if (!existsSync(emojiDir)) mkdirSync(emojiDir, { recursive: true })

        // 检查本地缓存
        for (const ext of ['.gif', '.png', '.webp', '.jpg', '.jpeg']) {
            const filePath = join(emojiDir, `${cacheKey}${ext}`)
            if (existsSync(filePath)) return { success: true, localPath: filePath }
        }

        // 保存解密后的图片
        const saveDecrypted = (buf: Buffer): { success: boolean; localPath?: string } => {
            const ext = this.isValidImageBuffer(buf) ? this.getImageExtFromBuffer(buf) : '.gif'
            const filePath = join(emojiDir, `${cacheKey}${ext}`)
            try { fs.writeFileSync(filePath, buf); return { success: true, localPath: filePath } }
            catch { return { success: false } }
        }

        // 1. 优先：encryptUrl + aesKey
        if (encryptUrl && aesKey) {
            const encResult = await this.doDownloadRaw(encryptUrl, cacheKey + '_enc', emojiDir)
            if (encResult) {
                const encData = fs.readFileSync(encResult)
                if (this.isValidImageBuffer(encData)) {
                    const ext = this.getImageExtFromBuffer(encData)
                    const filePath = join(emojiDir, `${cacheKey}${ext}`)
                    fs.writeFileSync(filePath, encData)
                    try { fs.unlinkSync(encResult) } catch { }
                    return { success: true, localPath: filePath }
                }
                const decrypted = this.decryptEmojiAes(encData, aesKey)
                if (decrypted) {
                    try { fs.unlinkSync(encResult) } catch { }
                    return saveDecrypted(decrypted)
                }
                try { fs.unlinkSync(encResult) } catch { }
            }
        }

        // 2. 直接下载 url
        if (url) {
            const result = await this.doDownloadRaw(url, cacheKey, emojiDir)
            if (result) {
                const buf = fs.readFileSync(result)
                if (this.isValidImageBuffer(buf)) return { success: true, localPath: result }
                // 用 aesKey 解密
                if (aesKey) {
                    const decrypted = this.decryptEmojiAes(buf, aesKey)
                    if (decrypted) {
                        try { fs.unlinkSync(result) } catch { }
                        return saveDecrypted(decrypted)
                    }
                }
                try { fs.unlinkSync(result) } catch { }
            }
        }

        return { success: false, error: '下载表情包失败' }
    }
}

export const snsService = new SnsService()