using System.Collections.Specialized;
using Bitget_Server.Application.Options;
using Bitget_Server.Domain;
using Bitget_Server.Domain.Enums;
using Bitget_Server.Infrastructure.Bitget;
using Bitget_Server.Infrastructure.Utils;
using Newtonsoft.Json;

namespace Bitget_Server.Application.Services;

/// <summary>
/// 기존 IndicatorProcess의 Private API 영역(주문/취소/잔고/포지션모드 변경/레버리지 변경/체결상세)을 이식한 서비스.
/// HMAC-SHA256 서명은 BitgetClient.GenerateSignString을 사용한다.
/// 외부 호출 경로는 BitgetClient.SendWebServerAsync → BitgetRateLimiter(20/sec) 순으로 흐른다.
/// </summary>
public class BitgetTradingService
{
    private readonly BitgetClient _client;
    private readonly GlobalOptions _options;
    private readonly ILogger<BitgetTradingService> _logger;

    public BitgetTradingService(
        BitgetClient client,
        GlobalOptions options,
        ILogger<BitgetTradingService> logger)
    {
        _client = client;
        _options = options;
        _logger = logger;
    }

    private string AccessKey => _options.SelectAPI?.AccessKey ?? string.Empty;
    private string SecretKey => _options.SelectAPI?.SecretKey ?? string.Empty;
    private string Passphrase => _options.SelectAPI?.PassphraseKey ?? string.Empty;

    /// <summary>Bitget 서버 타임스탬프 조회.</summary>
    public async Task<long> GetTimeStampAsync(CancellationToken ct = default)
    {
        var result = await _client.SendWebServerAsync(
            ExchangeWebReqType.BitgetGetTimeStamp,
            BitgetEndpoints.GetTimestamp,
            ct: ct).ConfigureAwait(false) as Dictionary<string, object>;

        if (result == null) return 0;

        var data = JsonConvert.DeserializeObject<Dictionary<string, object>>(
            JsonConvert.SerializeObject(result["data"]));

        long.TryParse(data["serverTime"].ToString(), out var ts);
        return ts;
    }

    /// <summary>미체결 주문 조회.</summary>
    public async Task<Dictionary<string, object>> GetPendingOrdersAsync(CancellationToken ct = default)
    {
        var timestamp = (await GetTimeStampAsync(ct).ConfigureAwait(false)).ToString();
        const string reqPath = "/api/v2/mix/order/orders-pending";

        var nvc = new NameValueCollection
        {
            { "ACCESS-KEY", AccessKey },
            { "ACCESS-SIGN", BitgetClient.GenerateSignString(timestamp, "GET", reqPath, "productType=USDT-FUTURES", null, SecretKey) },
            { "ACCESS-PASSPHRASE", Passphrase },
            { "ACCESS-TIMESTAMP", timestamp }
        };

        return await _client.SendWebServerAsync(
            ExchangeWebReqType.BitgetPendingOrder_Future,
            BitgetEndpoints.PendingOrders_Future,
            headers: nvc,
            ct: ct).ConfigureAwait(false) as Dictionary<string, object>;
    }

    /// <summary>선물 계좌 조회.</summary>
    public async Task<List<Dictionary<string, object>>> GetFutureAccountListAsync(CancellationToken ct = default)
    {
        var timestamp = (await GetTimeStampAsync(ct).ConfigureAwait(false)).ToString();
        const string reqPath = "/api/v2/mix/account/accounts";

        var nvc = new NameValueCollection
        {
            { "ACCESS-KEY", AccessKey },
            { "ACCESS-SIGN", BitgetClient.GenerateSignString(timestamp, "GET", reqPath, "productType=USDT-FUTURES", null, SecretKey) },
            { "ACCESS-PASSPHRASE", Passphrase },
            { "ACCESS-TIMESTAMP", timestamp }
        };

        return await _client.SendWebServerAsync(
            ExchangeWebReqType.BitgetAccountList_Future,
            BitgetEndpoints.AccountList_Future,
            headers: nvc,
            ct: ct).ConfigureAwait(false) as List<Dictionary<string, object>>;
    }

    /// <summary>주문 취소.</summary>
    public async Task<Dictionary<string, object>> CancelFutureOrderAsync(string symbol, string orderId, CancellationToken ct = default)
    {
        var timestamp = (await GetTimeStampAsync(ct).ConfigureAwait(false)).ToString();
        const string reqPath = "/api/v2/mix/order/cancel-order";
        var postStr = "{\"symbol\" : \"" + symbol + "\", \"orderId\" : \"" + orderId + "\", \"productType\" : \"usdt-futures\" , \"marginCoin\" : \"USDT\"}";

        var nvc = new NameValueCollection
        {
            { "ACCESS-KEY", AccessKey },
            { "ACCESS-SIGN", BitgetClient.GenerateSignString(timestamp, "POST", reqPath, "", postStr, SecretKey) },
            { "ACCESS-PASSPHRASE", Passphrase },
            { "ACCESS-TIMESTAMP", timestamp }
        };

        return await _client.SendWebServerAsync(
            ExchangeWebReqType.BitgetCancelOrder_Future,
            BitgetEndpoints.CancelOrder_Future,
            postData: postStr,
            headers: nvc,
            ct: ct).ConfigureAwait(false) as Dictionary<string, object>;
    }

    /// <summary>포지션 모드 변경 (one_way / hedge).</summary>
    public async Task<Dictionary<string, object>> ChangeFuturePositionModeAsync(FuturePositionMode mode, CancellationToken ct = default)
    {
        var timestamp = (await GetTimeStampAsync(ct).ConfigureAwait(false)).ToString();
        const string reqPath = "/api/v2/mix/account/set-position-mode";
        var postStr = "{\"productType\" : \"USDT-FUTURES\", \"posMode\" : \"" + Convertor.GetEnumDescription(mode) + "\"}";

        var nvc = new NameValueCollection
        {
            { "ACCESS-KEY", AccessKey },
            { "ACCESS-SIGN", BitgetClient.GenerateSignString(timestamp, "POST", reqPath, "", postStr, SecretKey) },
            { "ACCESS-PASSPHRASE", Passphrase },
            { "ACCESS-TIMESTAMP", timestamp }
        };

        return await _client.SendWebServerAsync(
            ExchangeWebReqType.BitgetChangePositionMode_Future,
            BitgetEndpoints.ChangePositionMode_Future,
            postData: postStr,
            headers: nvc,
            ct: ct).ConfigureAwait(false) as Dictionary<string, object>;
    }

    /// <summary>주문 상세 조회.</summary>
    public async Task<Dictionary<string, object>> GetFutureOrderDetailAsync(string symbol, string orderId, CancellationToken ct = default)
    {
        var timestamp = (await GetTimeStampAsync(ct).ConfigureAwait(false)).ToString();
        const string reqPath = "/api/v2/mix/order/detail";
        var queryString = $"symbol={symbol}&orderId={orderId}&productType=USDT-FUTURES";

        var nvc = new NameValueCollection
        {
            { "ACCESS-KEY", AccessKey },
            { "ACCESS-SIGN", BitgetClient.GenerateSignString(timestamp, "GET", reqPath, queryString, null, SecretKey) },
            { "ACCESS-PASSPHRASE", Passphrase },
            { "ACCESS-TIMESTAMP", timestamp }
        };

        var url = BitgetEndpoints.OrderDetail_Future + "?" + queryString;
        return await _client.SendWebServerAsync(
            ExchangeWebReqType.BitgetOrderDetail_Future,
            url,
            headers: nvc,
            ct: ct).ConfigureAwait(false) as Dictionary<string, object>;
    }

    /// <summary>
    /// 선물 주문 (Buy는 선행적으로 MarginMode/Leverage 변경, Sell은 사전 Cancel).
    /// 기존 IndicatorProcess.FutureOrder 로직 그대로 이식.
    /// </summary>
    public async Task<Dictionary<string, object>> FutureOrderAsync(
        string symbol,
        FutureMarginMode marginMode,
        double size,
        double price,
        FutureSide futureSide,
        OrderType orderType,
        double leverage,
        string id = "",
        CancellationToken ct = default)
    {
        var side = string.Empty;
        var tradeSide = string.Empty;

        switch (futureSide)
        {
            case FutureSide.BuyShort:
                id = Guid.NewGuid().ToString();
                side = "sell"; tradeSide = "open"; break;
            case FutureSide.BuyLong:
                id = Guid.NewGuid().ToString();
                side = "buy"; tradeSide = "Open"; break;
            case FutureSide.SellShort:
                side = "sell"; tradeSide = "close"; break;
            case FutureSide.SellLong:
                side = "buy"; tradeSide = "close"; break;
        }

        if (orderType == OrderType.market)
            price = 0;

        var timestamp = (await GetTimeStampAsync(ct).ConfigureAwait(false)).ToString();

        // Buy 주문: Margin Mode → Leverage → Order 체인
        if (futureSide == FutureSide.BuyShort || futureSide == FutureSide.BuyLong)
        {
            var changeMarginModeStr = "{\"symbol\": \"" + symbol + "\", \"productType\": \"usdt-futures\", \"marginCoin\": \"USDT\", \"marginMode\": \""
                + Convertor.GetEnumDescription(marginMode) + "\"}";

            var nvcMargin = new NameValueCollection
            {
                { "ACCESS-KEY", AccessKey },
                { "ACCESS-SIGN", BitgetClient.GenerateSignString(timestamp, "POST", "/api/v2/mix/account/set-margin-mode", "", changeMarginModeStr, SecretKey) },
                { "ACCESS-PASSPHRASE", Passphrase },
                { "ACCESS-TIMESTAMP", timestamp }
            };

            var marginResult = await _client.SendWebServerAsync(
                ExchangeWebReqType.BitgetChangeMarginMode_Future,
                BitgetEndpoints.ChangeMarginMode_Future,
                postData: changeMarginModeStr,
                headers: nvcMargin,
                ct: ct).ConfigureAwait(false) as Dictionary<string, object>;

            if (marginResult == null || marginResult["msg"]?.ToString() != "success")
            {
                _logger.LogWarning("MarginMode 변경 실패: {Symbol}", symbol);
                return null;
            }

            var leverageStr = "{\"symbol\": \"" + symbol + "\", \"productType\": \"USDT-FUTURES\", \"marginCoin\": \"USDT\", \"leverage\": \""
                + leverage.ToString() + "\", \"holdSide\": \"" + (futureSide == FutureSide.BuyShort ? "short" : "long") + "\"}";

            timestamp = (await GetTimeStampAsync(ct).ConfigureAwait(false)).ToString();
            var nvcLeverage = new NameValueCollection
            {
                { "ACCESS-KEY", AccessKey },
                { "ACCESS-SIGN", BitgetClient.GenerateSignString(timestamp, "POST", "/api/v2/mix/account/set-leverage", "", leverageStr, SecretKey) },
                { "ACCESS-PASSPHRASE", Passphrase },
                { "ACCESS-TIMESTAMP", timestamp }
            };

            var leverageResult = await _client.SendWebServerAsync(
                ExchangeWebReqType.BitgetChangeLeverage_Future,
                BitgetEndpoints.ChangeLeverage_Future,
                postData: leverageStr,
                headers: nvcLeverage,
                ct: ct).ConfigureAwait(false) as Dictionary<string, object>;

            if (leverageResult == null || leverageResult["msg"]?.ToString() != "success")
            {
                _logger.LogWarning("Leverage 변경 실패: {Symbol}", symbol);
                return null;
            }
        }
        else
        {
            // Sell 주문: 미체결 주문 취소 후 진행
            var cancelResult = await CancelFutureOrderAsync(symbol, id, ct).ConfigureAwait(false);
            if (cancelResult == null || cancelResult["msg"]?.ToString() != "success")
                _logger.LogError("Sell Cancel 실패: {Symbol} / {OrderId}", symbol, id);
        }

        // 실제 주문 전송
        const string reqPath = "/api/v2/mix/order/place-order";
        var postStr = "{\"symbol\": \"" + symbol + "\", \"productType\": \"usdt-futures\", \"marginMode\": \""
            + Convertor.GetEnumDescription(marginMode) + "\", \"marginCoin\": \"USDT\", \"size\": \"" + size.ToString()
            + "\", \"price\": \"" + price.ToString() + "\", \"side\": \"" + side + "\", \"tradeSide\": \"" + tradeSide
            + "\", \"orderType\": \"" + Convertor.GetEnumDescription(orderType)
            + "\", \"force\": \"gtc\", \"clientOid\": \"" + id + "\" }";

        timestamp = (await GetTimeStampAsync(ct).ConfigureAwait(false)).ToString();
        var nvc = new NameValueCollection
        {
            { "ACCESS-KEY", AccessKey },
            { "ACCESS-SIGN", BitgetClient.GenerateSignString(timestamp, "POST", reqPath, "", postStr, SecretKey) },
            { "ACCESS-PASSPHRASE", Passphrase },
            { "ACCESS-TIMESTAMP", timestamp }
        };

        return await _client.SendWebServerAsync(
            ExchangeWebReqType.BitgetOrder_Future,
            BitgetEndpoints.BuySellOrder_Future,
            postData: postStr,
            headers: nvc,
            ct: ct).ConfigureAwait(false) as Dictionary<string, object>;
    }
}