using Bitget_Server.Api.Dtos;
using Bitget_Server.Application.Services;
using Microsoft.AspNetCore.Mvc;

namespace Bitget_Server.Api.Controllers;

/// <summary>
/// 기존 WinForms 의 주문/취소/잔고 버튼을 REST 화.
/// Bitget Private API 를 호출하므로 반드시 선택된 API 키가 설정되어 있어야 한다.
/// </summary>
[ApiController]
[Route("api/trading")]
[Produces("application/json")]
public class TradingController : ControllerBase
{
    private readonly BitgetTradingService _trading;
    private readonly ILogger<TradingController> _logger;

    public TradingController(BitgetTradingService trading, ILogger<TradingController> logger)
    {
        _trading = trading;
        _logger = logger;
    }

    /// <summary>Bitget 서버 타임스탬프 조회 (헬스체크 용도로도 활용).</summary>
    [HttpGet("timestamp")]
    [ProducesResponseType(typeof(long), StatusCodes.Status200OK)]
    public async Task<ActionResult<long>> GetTimestamp(CancellationToken ct)
        => Ok(await _trading.GetTimeStampAsync(ct));

    /// <summary>선물 계좌 잔고/포지션 조회.</summary>
    [HttpGet("account")]
    [ProducesResponseType(typeof(List<Dictionary<string, object>>), StatusCodes.Status200OK)]
    [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status502BadGateway)]
    public async Task<IActionResult> GetAccount(CancellationToken ct)
    {
        var result = await _trading.GetFutureAccountListAsync(ct);
        if (result == null)
            return Problem(detail: "Bitget API 응답 없음", statusCode: StatusCodes.Status502BadGateway, title: "Account fetch failed");
        return Ok(result);
    }

    /// <summary>미체결 주문 조회.</summary>
    [HttpGet("orders/pending")]
    [ProducesResponseType(typeof(Dictionary<string, object>), StatusCodes.Status200OK)]
    [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status502BadGateway)]
    public async Task<IActionResult> GetPendingOrders(CancellationToken ct)
    {
        var result = await _trading.GetPendingOrdersAsync(ct);
        if (result == null)
            return Problem(detail: "Bitget API 응답 없음", statusCode: StatusCodes.Status502BadGateway, title: "Pending orders fetch failed");
        return Ok(result);
    }

    /// <summary>주문 상세 조회.</summary>
    [HttpGet("orders/{symbol}/{orderId}")]
    [ProducesResponseType(typeof(Dictionary<string, object>), StatusCodes.Status200OK)]
    [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status404NotFound)]
    public async Task<IActionResult> GetOrderDetail(string symbol, string orderId, CancellationToken ct)
    {
        var result = await _trading.GetFutureOrderDetailAsync(symbol, orderId, ct);
        if (result == null)
            return Problem(detail: "주문 상세 응답 없음", statusCode: StatusCodes.Status404NotFound, title: "Order detail not found");
        return Ok(result);
    }

    /// <summary>신규 주문.</summary>
    [HttpPost("orders")]
    [ProducesResponseType(typeof(Dictionary<string, object>), StatusCodes.Status200OK)]
    [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status502BadGateway)]
    public async Task<IActionResult> PlaceOrder([FromBody] PlaceOrderRequest req, CancellationToken ct)
    {
        try
        {
            var result = await _trading.FutureOrderAsync(
                req.Symbol,
                req.MarginMode,
                req.Size,
                req.Price,
                req.Side,
                req.OrderType,
                req.Leverage,
                req.ClientOrderId ?? string.Empty,
                ct);

            if (result == null)
                return Problem(detail: "주문 실패 (MarginMode/Leverage/Order 체인 중 단계 실패)",
                    statusCode: StatusCodes.Status502BadGateway, title: "Order failed");

            return Ok(result);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "주문 처리 실패: {Symbol}", req.Symbol);
            return Problem(detail: ex.Message, statusCode: StatusCodes.Status500InternalServerError, title: "Order processing error");
        }
    }

    /// <summary>주문 취소.</summary>
    [HttpDelete("orders")]
    [ProducesResponseType(typeof(Dictionary<string, object>), StatusCodes.Status200OK)]
    [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status502BadGateway)]
    public async Task<IActionResult> CancelOrder([FromBody] CancelOrderRequest req, CancellationToken ct)
    {
        var result = await _trading.CancelFutureOrderAsync(req.Symbol, req.OrderId, ct);
        if (result == null)
            return Problem(detail: "취소 응답 없음", statusCode: StatusCodes.Status502BadGateway, title: "Cancel failed");
        return Ok(result);
    }

    /// <summary>포지션 모드 변경(hedge / one_way).</summary>
    [HttpPut("position-mode")]
    [ProducesResponseType(typeof(Dictionary<string, object>), StatusCodes.Status200OK)]
    [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status502BadGateway)]
    public async Task<IActionResult> ChangePositionMode([FromBody] ChangePositionModeRequest req, CancellationToken ct)
    {
        var result = await _trading.ChangeFuturePositionModeAsync(req.Mode, ct);
        if (result == null)
            return Problem(detail: "포지션 모드 변경 실패", statusCode: StatusCodes.Status502BadGateway, title: "Position mode change failed");
        return Ok(result);
    }
}