package gemini

import (
	"errors"
	"fmt"
	"net/url"
	"strconv"
	"sync"

	"github.com/thrasher-/gocryptotrader/common"
	"github.com/thrasher-/gocryptotrader/currency/pair"
	exchange "github.com/thrasher-/gocryptotrader/exchanges"
	"github.com/thrasher-/gocryptotrader/exchanges/orderbook"
	"github.com/thrasher-/gocryptotrader/exchanges/ticker"
	log "github.com/thrasher-/gocryptotrader/logger"
)

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

// Run implements the Gemini wrapper
func (g *Gemini) Run() {
	if g.Verbose {
		log.Debugf("%s polling delay: %ds.\n", g.GetName(), g.RESTPollingDelay)
		log.Debugf("%s %d currencies enabled: %s.\n", g.GetName(), len(g.EnabledPairs), g.EnabledPairs)
	}

	exchangeProducts, err := g.GetSymbols()
	if err != nil {
		log.Errorf("%s Failed to get available symbols.\n", g.GetName())
	} else {
		err = g.UpdateCurrencies(exchangeProducts, false, false)
		if err != nil {
			log.Errorf("%s Failed to update available currencies.\n", g.GetName())
		}
	}
}

// GetAccountInfo Retrieves balances for all enabled currencies for the
// Gemini exchange
func (g *Gemini) GetAccountInfo() (exchange.AccountInfo, error) {
	var response exchange.AccountInfo
	response.ExchangeName = g.GetName()
	accountBalance, err := g.GetBalances()
	if err != nil {
		return response, err
	}
	for i := 0; i < len(accountBalance); i++ {
		var exchangeCurrency exchange.AccountCurrencyInfo
		exchangeCurrency.CurrencyName = accountBalance[i].Currency
		exchangeCurrency.TotalValue = accountBalance[i].Amount
		exchangeCurrency.Hold = accountBalance[i].Available
		response.Currencies = append(response.Currencies, exchangeCurrency)
	}
	return response, nil
}

// UpdateTicker updates and returns the ticker for a currency pair
func (g *Gemini) UpdateTicker(p pair.CurrencyPair, assetType string) (ticker.Price, error) {
	var tickerPrice ticker.Price
	tick, err := g.GetTicker(p.Pair().String())
	if err != nil {
		return tickerPrice, err
	}
	tickerPrice.Pair = p
	tickerPrice.Ask = tick.Ask
	tickerPrice.Bid = tick.Bid
	tickerPrice.Last = tick.Last
	tickerPrice.Volume = tick.Volume.USD
	ticker.ProcessTicker(g.GetName(), p, tickerPrice, assetType)
	return ticker.GetTicker(g.Name, p, assetType)
}

// GetTickerPrice returns the ticker for a currency pair
func (g *Gemini) GetTickerPrice(p pair.CurrencyPair, assetType string) (ticker.Price, error) {
	tickerNew, err := ticker.GetTicker(g.GetName(), p, assetType)
	if err != nil {
		return g.UpdateTicker(p, assetType)
	}
	return tickerNew, nil
}

// GetOrderbookEx returns orderbook base on the currency pair
func (g *Gemini) GetOrderbookEx(p pair.CurrencyPair, assetType string) (orderbook.Base, error) {
	ob, err := orderbook.GetOrderbook(g.GetName(), p, assetType)
	if err != nil {
		return g.UpdateOrderbook(p, assetType)
	}
	return ob, nil
}

// UpdateOrderbook updates and returns the orderbook for a currency pair
func (g *Gemini) UpdateOrderbook(p pair.CurrencyPair, assetType string) (orderbook.Base, error) {
	var orderBook orderbook.Base
	orderbookNew, err := g.GetOrderbook(p.Pair().String(), url.Values{})
	if err != nil {
		return orderBook, err
	}

	for x := range orderbookNew.Bids {
		orderBook.Bids = append(orderBook.Bids, orderbook.Item{Amount: orderbookNew.Bids[x].Amount, Price: orderbookNew.Bids[x].Price})
	}

	for x := range orderbookNew.Asks {
		orderBook.Asks = append(orderBook.Asks, orderbook.Item{Amount: orderbookNew.Asks[x].Amount, Price: orderbookNew.Asks[x].Price})
	}

	orderbook.ProcessOrderbook(g.GetName(), p, orderBook, assetType)
	return orderbook.GetOrderbook(g.Name, p, assetType)
}

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

// GetExchangeHistory returns historic trade data since exchange opening.
func (g *Gemini) GetExchangeHistory(p pair.CurrencyPair, assetType string) ([]exchange.TradeHistory, error) {
	var resp []exchange.TradeHistory

	return resp, common.ErrNotYetImplemented
}

// SubmitOrder submits a new order
func (g *Gemini) SubmitOrder(p pair.CurrencyPair, side exchange.OrderSide, orderType exchange.OrderType, amount, price float64, clientID string) (exchange.SubmitOrderResponse, error) {
	var submitOrderResponse exchange.SubmitOrderResponse
	response, err := g.NewOrder(p.Pair().String(), amount, price, side.ToString(), orderType.ToString())

	if response > 0 {
		submitOrderResponse.OrderID = fmt.Sprintf("%v", response)
	}

	if err == nil {
		submitOrderResponse.IsOrderPlaced = true
	}

	return submitOrderResponse, err
}

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

// CancelOrder cancels an order by its corresponding ID number
func (g *Gemini) CancelOrder(order exchange.OrderCancellation) error {
	orderIDInt, err := strconv.ParseInt(order.OrderID, 10, 64)
	if err != nil {
		return err
	}

	_, err = g.CancelExistingOrder(orderIDInt)
	return err
}

// CancelAllOrders cancels all orders associated with a currency pair
func (g *Gemini) CancelAllOrders(orderCancellation exchange.OrderCancellation) (exchange.CancelAllOrdersResponse, error) {
	cancelAllOrdersResponse := exchange.CancelAllOrdersResponse{
		OrderStatus: make(map[string]string),
	}
	resp, err := g.CancelExistingOrders(false)
	if err != nil {
		return cancelAllOrdersResponse, err
	}

	for _, order := range resp.Details.CancelRejects {
		cancelAllOrdersResponse.OrderStatus[order] = "Could not cancel order"
	}

	return cancelAllOrdersResponse, nil
}

// GetOrderInfo returns information on a current open order
func (g *Gemini) GetOrderInfo(orderID int64) (exchange.OrderDetail, error) {
	var orderDetail exchange.OrderDetail
	return orderDetail, common.ErrNotYetImplemented
}

// GetDepositAddress returns a deposit address for a specified currency
func (g *Gemini) GetDepositAddress(cryptocurrency pair.CurrencyItem) (string, error) {
	return "", common.ErrNotYetImplemented
}

// WithdrawCryptocurrencyFunds returns a withdrawal ID when a withdrawal is
// submitted
func (g *Gemini) WithdrawCryptocurrencyFunds(withdrawRequest exchange.WithdrawRequest) (string, error) {
	resp, err := g.WithdrawCrypto(withdrawRequest.Address, withdrawRequest.Currency.String(), withdrawRequest.Amount)
	if err != nil {
		return "", err
	}
	if resp.Result == "error" {
		return "", errors.New(resp.Message)
	}

	return resp.TXHash, err
}

// WithdrawFiatFunds returns a withdrawal ID when a
// withdrawal is submitted
func (g *Gemini) WithdrawFiatFunds(withdrawRequest exchange.WithdrawRequest) (string, error) {
	return "", common.ErrNotYetImplemented
}

// WithdrawFiatFundsToInternationalBank returns a withdrawal ID when a
// withdrawal is submitted
func (g *Gemini) WithdrawFiatFundsToInternationalBank(withdrawRequest exchange.WithdrawRequest) (string, error) {
	return "", common.ErrNotYetImplemented
}

// GetWebsocket returns a pointer to the exchange websocket
func (g *Gemini) GetWebsocket() (*exchange.Websocket, error) {
	return nil, common.ErrNotYetImplemented
}

// GetFeeByType returns an estimate of fee based on type of transaction
func (g *Gemini) GetFeeByType(feeBuilder exchange.FeeBuilder) (float64, error) {
	return g.GetFee(feeBuilder)
}

// GetWithdrawCapabilities returns the types of withdrawal methods permitted by the exchange
func (g *Gemini) GetWithdrawCapabilities() uint32 {
	return g.GetWithdrawPermissions()
}