package itbit

import (
	"fmt"
	"net/url"
	"strconv"
	"strings"
	"sync"
	"time"

	"github.com/thrasher-corp/gocryptotrader/common"
	"github.com/thrasher-corp/gocryptotrader/config"
	"github.com/thrasher-corp/gocryptotrader/currency"
	exchange "github.com/thrasher-corp/gocryptotrader/exchanges"
	"github.com/thrasher-corp/gocryptotrader/exchanges/asset"
	"github.com/thrasher-corp/gocryptotrader/exchanges/order"
	"github.com/thrasher-corp/gocryptotrader/exchanges/orderbook"
	"github.com/thrasher-corp/gocryptotrader/exchanges/protocol"
	"github.com/thrasher-corp/gocryptotrader/exchanges/request"
	"github.com/thrasher-corp/gocryptotrader/exchanges/ticker"
	"github.com/thrasher-corp/gocryptotrader/exchanges/websocket/wshandler"
	log "github.com/thrasher-corp/gocryptotrader/logger"
)

// GetDefaultConfig returns a default exchange config
func (i *ItBit) GetDefaultConfig() (*config.ExchangeConfig, error) {
	i.SetDefaults()
	exchCfg := new(config.ExchangeConfig)
	exchCfg.Name = i.Name
	exchCfg.HTTPTimeout = exchange.DefaultHTTPTimeout
	exchCfg.BaseCurrencies = i.BaseCurrencies

	err := i.SetupDefaults(exchCfg)
	if err != nil {
		return nil, err
	}

	if i.Features.Supports.RESTCapabilities.AutoPairUpdates {
		err = i.UpdateTradablePairs(true)
		if err != nil {
			return nil, err
		}
	}

	return exchCfg, nil
}

// SetDefaults sets the defaults for the exchange
func (i *ItBit) SetDefaults() {
	i.Name = "ITBIT"
	i.Enabled = true
	i.Verbose = true
	i.API.CredentialsValidator.RequiresClientID = true
	i.API.CredentialsValidator.RequiresSecret = true

	i.CurrencyPairs = currency.PairsManager{
		AssetTypes: asset.Items{
			asset.Spot,
		},
		UseGlobalFormat: true,
		RequestFormat: &currency.PairFormat{
			Uppercase: true,
		},
		ConfigFormat: &currency.PairFormat{
			Uppercase: true,
		},
	}

	i.Features = exchange.Features{
		Supports: exchange.FeaturesSupported{
			REST:      true,
			Websocket: false,
			RESTCapabilities: protocol.Features{
				TickerFetching:    true,
				TradeFetching:     true,
				OrderbookFetching: true,
				AccountInfo:       true,
				GetOrder:          true,
				GetOrders:         true,
				CancelOrder:       true,
				SubmitOrder:       true,
				DepositHistory:    true,
				WithdrawalHistory: true,
				UserTradeHistory:  true,
				CryptoDeposit:     true,
				TradeFee:          true,
				FiatWithdrawalFee: true,
			},
			WithdrawPermissions: exchange.WithdrawCryptoViaWebsiteOnly |
				exchange.WithdrawFiatViaWebsiteOnly,
		},
		Enabled: exchange.FeaturesEnabled{
			AutoPairUpdates: false,
		},
	}

	i.Requester = request.New(i.Name,
		request.NewRateLimit(time.Second, itbitAuthRate),
		request.NewRateLimit(time.Second, itbitUnauthRate),
		common.NewHTTPClientWithTimeout(exchange.DefaultHTTPTimeout))

	i.API.Endpoints.URLDefault = itbitAPIURL
	i.API.Endpoints.URL = i.API.Endpoints.URLDefault
}

// Setup sets the exchange parameters from exchange config
func (i *ItBit) Setup(exch *config.ExchangeConfig) error {
	if !exch.Enabled {
		i.SetEnabled(false)
		return nil
	}

	return i.SetupDefaults(exch)
}

// Start starts the ItBit go routine
func (i *ItBit) Start(wg *sync.WaitGroup) {
	wg.Add(1)
	go func() {
		i.Run()
		wg.Done()
	}()
}

// Run implements the ItBit wrapper
func (i *ItBit) Run() {
	if i.Verbose {
		i.PrintEnabledPairs()
	}
}

// FetchTradablePairs returns a list of the exchanges tradable pairs
func (i *ItBit) FetchTradablePairs(asset asset.Item) ([]string, error) {
	return nil, common.ErrFunctionNotSupported
}

// UpdateTradablePairs updates the exchanges available pairs and stores
// them in the exchanges config
func (i *ItBit) UpdateTradablePairs(forceUpdate bool) error {
	return common.ErrFunctionNotSupported
}

// UpdateTicker updates and returns the ticker for a currency pair
func (i *ItBit) UpdateTicker(p currency.Pair, assetType asset.Item) (ticker.Price, error) {
	var tickerPrice ticker.Price
	tick, err := i.GetTicker(i.FormatExchangeCurrency(p, assetType).String())
	if err != nil {
		return tickerPrice, err
	}
	tickerPrice = ticker.Price{
		Last:        tick.LastPrice,
		High:        tick.High24h,
		Low:         tick.Low24h,
		Bid:         tick.Bid,
		Ask:         tick.Ask,
		Volume:      tick.Volume24h,
		Open:        tick.OpenToday,
		Pair:        p,
		LastUpdated: tick.ServertimeUTC,
	}
	err = ticker.ProcessTicker(i.GetName(), &tickerPrice, assetType)
	if err != nil {
		return tickerPrice, err
	}

	return ticker.GetTicker(i.Name, p, assetType)
}

// FetchTicker returns the ticker for a currency pair
func (i *ItBit) FetchTicker(p currency.Pair, assetType asset.Item) (ticker.Price, error) {
	tickerNew, err := ticker.GetTicker(i.GetName(), p, assetType)
	if err != nil {
		return i.UpdateTicker(p, assetType)
	}
	return tickerNew, nil
}

// FetchOrderbook returns orderbook base on the currency pair
func (i *ItBit) FetchOrderbook(p currency.Pair, assetType asset.Item) (orderbook.Base, error) {
	ob, err := orderbook.Get(i.GetName(), p, assetType)
	if err != nil {
		return i.UpdateOrderbook(p, assetType)
	}
	return ob, nil
}

// UpdateOrderbook updates and returns the orderbook for a currency pair
func (i *ItBit) UpdateOrderbook(p currency.Pair, assetType asset.Item) (orderbook.Base, error) {
	var orderBook orderbook.Base
	orderbookNew, err := i.GetOrderbook(i.FormatExchangeCurrency(p, assetType).String())
	if err != nil {
		return orderBook, err
	}

	for x := range orderbookNew.Bids {
		data := orderbookNew.Bids[x]
		var price, amount float64
		price, err = strconv.ParseFloat(data[0], 64)
		if err != nil {
			return orderBook, err
		}
		amount, err = strconv.ParseFloat(data[1], 64)
		if err != nil {
			return orderBook, err
		}
		orderBook.Bids = append(orderBook.Bids,
			orderbook.Item{
				Amount: amount,
				Price:  price,
			})
	}

	for x := range orderbookNew.Asks {
		data := orderbookNew.Asks[x]
		var price, amount float64
		price, err = strconv.ParseFloat(data[0], 64)
		if err != nil {
			return orderBook, err
		}
		amount, err = strconv.ParseFloat(data[1], 64)
		if err != nil {
			return orderBook, err
		}
		orderBook.Asks = append(orderBook.Asks,
			orderbook.Item{
				Amount: amount,
				Price:  price,
			})
	}

	orderBook.Pair = p
	orderBook.ExchangeName = i.GetName()
	orderBook.AssetType = assetType

	err = orderBook.Process()
	if err != nil {
		return orderBook, err
	}

	return orderbook.Get(i.Name, p, assetType)
}

// GetAccountInfo retrieves balances for all enabled currencies
func (i *ItBit) GetAccountInfo() (exchange.AccountInfo, error) {
	var info exchange.AccountInfo
	info.Exchange = i.GetName()

	wallets, err := i.GetWallets(url.Values{})
	if err != nil {
		return info, err
	}

	type balance struct {
		TotalValue float64
		Hold       float64
	}

	var amounts = make(map[string]*balance)

	for x := range wallets {
		for _, cb := range wallets[x].Balances {
			if _, ok := amounts[cb.Currency]; !ok {
				amounts[cb.Currency] = &balance{}
			}

			amounts[cb.Currency].TotalValue += cb.TotalBalance
			amounts[cb.Currency].Hold += cb.TotalBalance - cb.AvailableBalance
		}
	}

	var fullBalance []exchange.AccountCurrencyInfo
	for key := range amounts {
		fullBalance = append(fullBalance, exchange.AccountCurrencyInfo{
			CurrencyName: currency.NewCode(key),
			TotalValue:   amounts[key].TotalValue,
			Hold:         amounts[key].Hold,
		})
	}

	info.Accounts = append(info.Accounts, exchange.Account{
		Currencies: fullBalance,
	})

	return info, nil
}

// GetFundingHistory returns funding history, deposits and
// withdrawals
func (i *ItBit) GetFundingHistory() ([]exchange.FundHistory, error) {
	var fundHistory []exchange.FundHistory
	return fundHistory, common.ErrFunctionNotSupported
}

// GetExchangeHistory returns historic trade data since exchange opening.
func (i *ItBit) GetExchangeHistory(p currency.Pair, assetType asset.Item) ([]exchange.TradeHistory, error) {
	return nil, common.ErrNotYetImplemented
}

// SubmitOrder submits a new order
func (i *ItBit) SubmitOrder(s *order.Submit) (order.SubmitResponse, error) {
	var submitOrderResponse order.SubmitResponse
	if err := s.Validate(); err != nil {
		return submitOrderResponse, err
	}

	var wallet string
	wallets, err := i.GetWallets(url.Values{})
	if err != nil {
		return submitOrderResponse, err
	}

	// Determine what wallet ID to use if there is any actual available currency to make the trade!
	for i := range wallets {
		for j := range wallets[i].Balances {
			if wallets[i].Balances[j].Currency == s.Pair.Base.String() &&
				wallets[i].Balances[j].AvailableBalance >= s.Amount {
				wallet = wallets[i].ID
			}
		}
	}

	if wallet == "" {
		return submitOrderResponse,
			fmt.Errorf("no wallet found with currency: %s with amount >= %v",
				s.Pair.Base,
				s.Amount)
	}

	response, err := i.PlaceOrder(wallet,
		s.OrderSide.String(),
		s.OrderType.String(),
		s.Pair.Base.String(),
		s.Amount,
		s.Price,
		s.Pair.String(),
		"")
	if response.ID != "" {
		submitOrderResponse.OrderID = response.ID
	}
	if err == nil {
		submitOrderResponse.IsOrderPlaced = true
	}

	return submitOrderResponse, err
}

// ModifyOrder will allow of changing orderbook placement and limit to
// market conversion
func (i *ItBit) ModifyOrder(action *order.Modify) (string, error) {
	return "", common.ErrFunctionNotSupported
}

// CancelOrder cancels an order by its corresponding ID number
func (i *ItBit) CancelOrder(order *order.Cancel) error {
	return i.CancelExistingOrder(order.WalletAddress, order.OrderID)
}

// CancelAllOrders cancels all orders associated with a currency pair
func (i *ItBit) CancelAllOrders(orderCancellation *order.Cancel) (order.CancelAllResponse, error) {
	cancelAllOrdersResponse := order.CancelAllResponse{
		Status: make(map[string]string),
	}
	openOrders, err := i.GetOrders(orderCancellation.WalletAddress, "", "open", 0, 0)
	if err != nil {
		return cancelAllOrdersResponse, err
	}

	for j := range openOrders {
		err = i.CancelExistingOrder(orderCancellation.WalletAddress, openOrders[j].ID)
		if err != nil {
			cancelAllOrdersResponse.Status[openOrders[j].ID] = err.Error()
		}
	}

	return cancelAllOrdersResponse, nil
}

// GetOrderInfo returns information on a current open order
func (i *ItBit) GetOrderInfo(orderID string) (order.Detail, error) {
	var orderDetail order.Detail
	return orderDetail, common.ErrNotYetImplemented
}

// GetDepositAddress returns a deposit address for a specified currency
// NOTE: This has not been implemented due to the fact you need to generate a
// a specific wallet ID and they restrict the amount of deposit address you can
// request limiting them to 2.
func (i *ItBit) GetDepositAddress(cryptocurrency currency.Code, accountID string) (string, error) {
	return "", common.ErrNotYetImplemented
}

// WithdrawCryptocurrencyFunds returns a withdrawal ID when a withdrawal is
// submitted
func (i *ItBit) WithdrawCryptocurrencyFunds(withdrawRequest *exchange.CryptoWithdrawRequest) (string, error) {
	return "", common.ErrFunctionNotSupported
}

// WithdrawFiatFunds returns a withdrawal ID when a
// withdrawal is submitted
func (i *ItBit) WithdrawFiatFunds(withdrawRequest *exchange.FiatWithdrawRequest) (string, error) {
	return "", common.ErrFunctionNotSupported
}

// WithdrawFiatFundsToInternationalBank returns a withdrawal ID when a
// withdrawal is submitted
func (i *ItBit) WithdrawFiatFundsToInternationalBank(withdrawRequest *exchange.FiatWithdrawRequest) (string, error) {
	return "", common.ErrFunctionNotSupported
}

// GetWebsocket returns a pointer to the exchange websocket
func (i *ItBit) GetWebsocket() (*wshandler.Websocket, error) {
	return nil, common.ErrFunctionNotSupported
}

// GetFeeByType returns an estimate of fee based on type of transaction
func (i *ItBit) GetFeeByType(feeBuilder *exchange.FeeBuilder) (float64, error) {
	if !i.AllowAuthenticatedRequest() && // Todo check connection status
		feeBuilder.FeeType == exchange.CryptocurrencyTradeFee {
		feeBuilder.FeeType = exchange.OfflineTradeFee
	}
	return i.GetFee(feeBuilder)
}

// GetActiveOrders retrieves any orders that are active/open
func (i *ItBit) GetActiveOrders(req *order.GetOrdersRequest) ([]order.Detail, error) {
	wallets, err := i.GetWallets(url.Values{})
	if err != nil {
		return nil, err
	}

	var allOrders []Order
	for x := range wallets {
		resp, err := i.GetOrders(wallets[x].ID, "", "open", 0, 0)
		if err != nil {
			return nil, err
		}
		allOrders = append(allOrders, resp...)
	}

	var orders []order.Detail
	for j := range allOrders {
		symbol := currency.NewPairDelimiter(allOrders[j].Instrument,
			i.GetPairFormat(asset.Spot, false).Delimiter)
		side := order.Side(strings.ToUpper(allOrders[j].Side))
		orderDate, err := time.Parse(time.RFC3339, allOrders[j].CreatedTime)
		if err != nil {
			log.Warnf(log.ExchangeSys,
				"Exchange %v Func %v Order %v Could not parse date to unix with value of %v",
				i.Name,
				"GetActiveOrders",
				allOrders[j].ID,
				allOrders[j].CreatedTime)
		}

		orders = append(orders, order.Detail{
			ID:              allOrders[j].ID,
			OrderSide:       side,
			Amount:          allOrders[j].Amount,
			ExecutedAmount:  allOrders[j].AmountFilled,
			RemainingAmount: (allOrders[j].Amount - allOrders[j].AmountFilled),
			Exchange:        i.Name,
			OrderDate:       orderDate,
			CurrencyPair:    symbol,
		})
	}

	order.FilterOrdersByTickRange(&orders, req.StartTicks, req.EndTicks)
	order.FilterOrdersBySide(&orders, req.OrderSide)
	order.FilterOrdersByCurrencies(&orders, req.Currencies)
	return orders, nil
}

// GetOrderHistory retrieves account order information
// Can Limit response to specific order status
func (i *ItBit) GetOrderHistory(req *order.GetOrdersRequest) ([]order.Detail, error) {
	wallets, err := i.GetWallets(url.Values{})
	if err != nil {
		return nil, err
	}

	var allOrders []Order
	for x := range wallets {
		resp, err := i.GetOrders(wallets[x].ID, "", "", 0, 0)
		if err != nil {
			return nil, err
		}
		allOrders = append(allOrders, resp...)
	}

	var orders []order.Detail
	for j := range allOrders {
		if allOrders[j].Type == "open" {
			continue
		}

		symbol := currency.NewPairDelimiter(allOrders[j].Instrument,
			i.GetPairFormat(asset.Spot, false).Delimiter)
		side := order.Side(strings.ToUpper(allOrders[j].Side))
		orderDate, err := time.Parse(time.RFC3339, allOrders[j].CreatedTime)
		if err != nil {
			log.Warnf(log.ExchangeSys,
				"Exchange %v Func %v Order %v Could not parse date to unix with value of %v",
				i.Name,
				"GetActiveOrders",
				allOrders[j].ID,
				allOrders[j].CreatedTime)
		}

		orders = append(orders, order.Detail{
			ID:              allOrders[j].ID,
			OrderSide:       side,
			Amount:          allOrders[j].Amount,
			ExecutedAmount:  allOrders[j].AmountFilled,
			RemainingAmount: (allOrders[j].Amount - allOrders[j].AmountFilled),
			Exchange:        i.Name,
			OrderDate:       orderDate,
			CurrencyPair:    symbol,
		})
	}

	order.FilterOrdersByTickRange(&orders, req.StartTicks, req.EndTicks)
	order.FilterOrdersBySide(&orders, req.OrderSide)
	order.FilterOrdersByCurrencies(&orders, req.Currencies)
	return orders, nil
}

// SubscribeToWebsocketChannels appends to ChannelsToSubscribe
// which lets websocket.manageSubscriptions handle subscribing
func (i *ItBit) SubscribeToWebsocketChannels(channels []wshandler.WebsocketChannelSubscription) error {
	return common.ErrFunctionNotSupported
}

// UnsubscribeToWebsocketChannels removes from ChannelsToSubscribe
// which lets websocket.manageSubscriptions handle unsubscribing
func (i *ItBit) UnsubscribeToWebsocketChannels(channels []wshandler.WebsocketChannelSubscription) error {
	return common.ErrFunctionNotSupported
}

// GetSubscriptions returns a copied list of subscriptions
func (i *ItBit) GetSubscriptions() ([]wshandler.WebsocketChannelSubscription, error) {
	return nil, common.ErrFunctionNotSupported
}

// AuthenticateWebsocket sends an authentication message to the websocket
func (i *ItBit) AuthenticateWebsocket() error {
	return common.ErrFunctionNotSupported
}