using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Alpaca.Markets;
using FinlyticBot.Util;
using FinlyticCore.Models.Trades;
using FinlyticCore.Services;
using Microsoft.Extensions.Configuration;

namespace FinlyticBot.Services;

public class AlpacaBrokerService : IAlpacaBrokerService
{
    private readonly ISettingsService _settingsService;
    private readonly IConfiguration _configuration;
    private readonly IFinlyticLogger<AlpacaBrokerService> _finlyticLogger;

    private IAlpacaTradingClient? _cachedClient;
    private string _lastInitKey = string.Empty;

    public AlpacaBrokerService(
        ISettingsService settingsService,
        IConfiguration configuration,
        IFinlyticLogger<AlpacaBrokerService> finlyticLogger)
    {
        _settingsService = settingsService;
        _configuration = configuration;
        _finlyticLogger = finlyticLogger;
    }

    private async Task<IAlpacaTradingClient?> GetClientAsync(CancellationToken ct = default)
    {
        string keyId = await _settingsService.GetSettingAsync(SettingKeys.AlpacaKeyId, ct);
        if (string.IsNullOrWhiteSpace(keyId))
        {
            keyId = _configuration["Alpaca:KeyId"] ?? _configuration["Alpaca__KeyId"] ?? string.Empty;
        }

        string secretKey = await _settingsService.GetSettingAsync(SettingKeys.AlpacaSecretKey, ct);
        if (string.IsNullOrWhiteSpace(secretKey))
        {
            secretKey = _configuration["Alpaca:SecretKey"] ?? _configuration["Alpaca__SecretKey"] ?? string.Empty;
        }

        bool isPaper = await _settingsService.GetSettingAsync(SettingKeys.AlpacaIsPaper, ct);
        if (string.IsNullOrWhiteSpace(keyId) || string.IsNullOrWhiteSpace(secretKey))
        {
            await _finlyticLogger.LogWarningAsync(SettingKeys.BotChannel,
                "[AlpacaBroker] Alpaca API credentials (KeyId/SecretKey) are missing or empty.");
            return null;
        }

        string currentInitKey = $"{keyId}_{secretKey}_{isPaper}";
        if (_cachedClient != null && _lastInitKey == currentInitKey)
        {
            return _cachedClient;
        }

        var environment = isPaper ? Alpaca.Markets.Environments.Paper : Alpaca.Markets.Environments.Live;
        _cachedClient = environment.GetAlpacaTradingClient(new SecretKey(keyId, secretKey));
        _lastInitKey = currentInitKey;

        await _finlyticLogger.LogInfoAsync(SettingKeys.BotChannel,
            "[AlpacaBroker] Initialized Alpaca Trading Client (Environment: {Env})", isPaper ? "Paper" : "Live");

        return _cachedClient;
    }

    public async Task<BrokerAccountInfo?> GetAccountInfoAsync(CancellationToken ct = default)
    {
        var client = await GetClientAsync(ct);
        if (client == null) return null;

        try
        {
            var account = await client.GetAccountAsync(ct);
            return new BrokerAccountInfo(
                Equity: account.Equity ?? 0m,
                BuyingPower: account.BuyingPower ?? 0m,
                Cash: account.TradableCash,
                Currency: account.Currency ?? "USD",
                IsBlocked: account.IsTradingBlocked
            );
        }
        catch (Exception ex)
        {
            await _finlyticLogger.LogErrorAsync(SettingKeys.BotChannel, ex,
                "[AlpacaBroker] Failed to fetch account information from Alpaca.");
            return null;
        }
    }

    public async Task<IAsset?> GetAssetAsync(string symbol, CancellationToken ct = default)
    {
        var client = await GetClientAsync(ct);
        if (client == null) return null;

        try
        {
            return await client.GetAssetAsync(symbol, ct);
        }
        catch (Exception ex)
        {
            await _finlyticLogger.LogWarningAsync(SettingKeys.BotChannel,
                "[AlpacaBroker] Asset {Symbol} not found or query error: {Msg}", symbol, ex.Message);
            return null;
        }
    }

    public async Task<IClock?> GetMarketClockAsync(CancellationToken ct = default)
    {
        var client = await GetClientAsync(ct);
        if (client == null) return null;

        try
        {
            return await client.GetClockAsync(ct);
        }
        catch (Exception ex)
        {
            await _finlyticLogger.LogWarningAsync(SettingKeys.BotChannel,
                "[AlpacaBroker] Failed to query market clock: {Msg}", ex.Message);
            return null;
        }
    }

    public async Task<IOrder?> PlaceBracketOrderAsync(
        TradeProposalDto proposal,
        decimal quantity,
        string orderType = "Limit",
        CancellationToken ct = default)
    {
        var client = await GetClientAsync(ct);
        if (client == null) return null;

        var side = string.Equals(proposal.SignalType, "SELL", StringComparison.OrdinalIgnoreCase)
            ? OrderSide.Sell
            : OrderSide.Buy;

        OrderQuantity orderQty = OrderQuantity.Fractional(quantity);
        OrderBase baseOrder;

        if (string.Equals(orderType, "Market", StringComparison.OrdinalIgnoreCase))
        {
            baseOrder = (side == OrderSide.Buy 
                ? MarketOrder.Buy(proposal.Symbol, orderQty)
                : MarketOrder.Sell(proposal.Symbol, orderQty))
                .Bracket(proposal.TakeProfit, proposal.StopLoss);
        }
        else
        {
            baseOrder = (side == OrderSide.Buy
                ? LimitOrder.Buy(proposal.Symbol, orderQty, proposal.EntryPrice)
                : LimitOrder.Sell(proposal.Symbol, orderQty, proposal.EntryPrice))
                .Bracket(proposal.TakeProfit, proposal.StopLoss);
        }

        baseOrder.Duration = TimeInForce.Gtc;

        try
        {
            await _finlyticLogger.LogInfoAsync(SettingKeys.BotChannel,
                "[AlpacaBroker] Placing Bracket Order for {Symbol}: Side={Side}, Qty={Qty}, Entry=${Entry:F2}, SL=${SL:F2}, TP=${TP:F2}",
                proposal.Symbol, side, quantity, proposal.EntryPrice, proposal.StopLoss, proposal.TakeProfit);

            var placedOrder = await client.PostOrderAsync(baseOrder, ct);
            await _finlyticLogger.LogInfoAsync(SettingKeys.BotChannel,
                "[AlpacaBroker] Bracket Order successfully placed with Alpaca! OrderId: {OrderId}, Status: {Status}",
                placedOrder.OrderId, placedOrder.OrderStatus);

            return placedOrder;
        }
        catch (Exception ex)
        {
            await _finlyticLogger.LogErrorAsync(SettingKeys.BotChannel, ex,
                "[AlpacaBroker] Failed to place bracket order for {Symbol} on Alpaca.", proposal.Symbol);
            return null;
        }
    }

    public async Task<bool> CancelOrderAsync(Guid orderId, CancellationToken ct = default)
    {
        var client = await GetClientAsync(ct);
        if (client == null) return false;

        try
        {
            return await client.CancelOrderAsync(orderId, ct);
        }
        catch (Exception ex)
        {
            await _finlyticLogger.LogErrorAsync(SettingKeys.BotChannel, ex,
                "[AlpacaBroker] Failed to cancel order {OrderId} on Alpaca.", orderId);
            return false;
        }
    }

    public async Task<IReadOnlyList<IOrder>> GetOpenOrdersAsync(CancellationToken ct = default)
    {
        var client = await GetClientAsync(ct);
        if (client == null) return Array.Empty<IOrder>();

        try
        {
            var req = new ListOrdersRequest { OrderStatusFilter = OrderStatusFilter.Open };
            return await client.ListOrdersAsync(req, ct);
        }
        catch (Exception ex)
        {
            await _finlyticLogger.LogErrorAsync(SettingKeys.BotChannel, ex,
                "[AlpacaBroker] Failed to list open orders from Alpaca.");
            return Array.Empty<IOrder>();
        }
    }
}