using Managing.Application.Abstractions;
using Managing.Application.Abstractions.Services;
using Managing.Application.Trading.Commands;
using Managing.Domain.MoneyManagements;
using Managing.Domain.Trades;
using MediatR;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using static Managing.Common.Enums;

namespace Managing.Api.Controllers;

/// <summary>
/// Controller for trading operations such as opening and closing positions, and retrieving trade information.
/// Requires authorization for access.
/// </summary>
[ApiController]
[Authorize]
[Route("[controller]")]
public class TradingController : BaseController
{
    private readonly ICommandHandler<OpenPositionRequest, Position> _openTradeCommandHandler;
    private readonly ICommandHandler<ClosePositionCommand, Position> _closeTradeCommandHandler;
    private readonly ITradingService _tradingService;
    private readonly IMoneyManagementService _moneyManagementService;
    private readonly IMediator _mediator;
    private readonly ILogger<TradingController> _logger;

    /// <summary>
    /// Initializes a new instance of the <see cref="TradingController"/> class.
    /// </summary>
    /// <param name="logger">Logger for logging information.</param>
    /// <param name="openTradeCommandHandler">Command handler for opening trades.</param>
    /// <param name="closeTradeCommandHandler">Command handler for closing trades.</param>
    /// <param name="tradingService">Service for trading operations.</param>
    /// <param name="mediator">Mediator for handling commands and requests.</param>
    public TradingController(
        ILogger<TradingController> logger,
        ICommandHandler<OpenPositionRequest, Position> openTradeCommandHandler,
        ICommandHandler<ClosePositionCommand, Position> closeTradeCommandHandler,
        ITradingService tradingService,
        IMediator mediator, IMoneyManagementService moneyManagementService,
        IUserService userService) : base(userService)
    {
        _logger = logger;
        _openTradeCommandHandler = openTradeCommandHandler;
        _closeTradeCommandHandler = closeTradeCommandHandler;
        _tradingService = tradingService;
        _mediator = mediator;
        _moneyManagementService = moneyManagementService;
    }

    /// <summary>
    /// Retrieves a list of positions based on the initiator type.
    /// </summary>
    /// <param name="positionInitiator">The initiator of the position (e.g., User, System).</param>
    /// <returns>A list of positions.</returns>
    [HttpGet("GetPositions")]
    public async Task<ActionResult<List<Position>>> GetPositions(PositionInitiator positionInitiator)
    {
        var result = await _mediator.Send(new GetPositionsCommand(positionInitiator));
        return Ok(result);
    }

    /// <summary>
    /// Retrieves a specific trade by account name, ticker, and exchange order ID.
    /// </summary>
    /// <param name="accountName">The name of the account.</param>
    /// <param name="ticker">The ticker symbol of the trade.</param>
    /// <param name="exchangeOrderId">The exchange order ID of the trade.</param>
    /// <returns>The requested trade.</returns>
    [HttpGet("GetTrade")]
    public async Task<ActionResult<Trade>> GetTrade(string accountName, Ticker ticker, string exchangeOrderId)
    {
        var result = await _mediator.Send(new GetTradeCommand(accountName, exchangeOrderId, ticker));
        return Ok(result);
    }

    /// <summary>
    /// Retrieves a list of trades for a given account and ticker.
    /// </summary>
    /// <param name="accountName">The name of the account.</param>
    /// <param name="ticker">The ticker symbol of the trades.</param>
    /// <returns>A list of trades.</returns>
    [HttpGet("GetTrades")]
    public async Task<ActionResult<Trade>> GetTrades(string accountName, Ticker ticker)
    {
        var result = await _mediator.Send(new GetTradesCommand(ticker, accountName));
        return Ok(result);
    }

    /// <summary>
    /// Closes a position identified by its unique identifier.
    /// </summary>
    /// <param name="identifier">The unique identifier of the position to close.</param>
    /// <returns>The closed position.</returns>
    [HttpPost("ClosePosition")]
    public async Task<ActionResult<Position>> ClosePosition(string identifier)
    {
        var position = _tradingService.GetPositionByIdentifier(identifier);
        var result = await _closeTradeCommandHandler.Handle(new ClosePositionCommand(position));
        return Ok(result);
    }

    /// <summary>
    /// Opens a new position based on the provided parameters.
    /// </summary>
    /// <param name="accountName">The name of the account to open the position for.</param>
    /// <param name="moneyManagementName">The name of the money management strategy to use.</param>
    /// <param name="direction">The direction of the trade (Buy or Sell).</param>
    /// <param name="ticker">The ticker symbol for the trade.</param>
    /// <param name="riskLevel">The risk level for the trade.</param>
    /// <param name="isForPaperTrading">Indicates whether the trade is for paper trading.</param>
    /// <param name="moneyManagement">The money management strategy details (optional).</param>
    /// <param name="openPrice">The opening price for the trade (optional).</param>
    /// <returns>The opened position.</returns>
    [HttpPost("OpenPosition")]
    public async Task<ActionResult<Position>> Trade(
        string accountName,
        string moneyManagementName,
        TradeDirection direction,
        Ticker ticker,
        RiskLevel riskLevel,
        bool isForPaperTrading,
        MoneyManagement? moneyManagement = null,
        decimal? openPrice = null)
    {
        if (string.IsNullOrEmpty(accountName))
        {
            throw new ArgumentException($"'{nameof(accountName)}' cannot be null or empty.", nameof(accountName));
        }

        if (string.IsNullOrEmpty(moneyManagementName) && moneyManagement == null)
        {
            throw new ArgumentException($"'{nameof(moneyManagementName)}' cannot be null or empty.",
                nameof(moneyManagementName));
        }

        if (moneyManagement != null)
        {
            var user = await GetUser();
            moneyManagement = await _moneyManagementService.GetMoneyMangement(user, moneyManagementName);
        }

        var command = new OpenPositionRequest(
            accountName,
            moneyManagement,
            direction,
            ticker,
            PositionInitiator.User,
            DateTime.UtcNow,
            isForPaperTrading: isForPaperTrading,
            price: openPrice);
        var result = await _openTradeCommandHandler.Handle(command);
        return Ok(result);
    }
}