using Microsoft.AspNetCore.Mvc;
using YD_TrainingCompetition_Api.Competition;

namespace YD_TrainingCompetition_Api.Controllers;

[ApiController]
[Route("api/[controller]")]
// CompetitionController 是前端比赛页使用的主控制器，
// 负责暴露“建会话、切场次、下载本场、开始/停止/清零、手工改分”等接口。
public sealed class CompetitionController : ControllerBase
{
    private readonly ICompetitionSessionService _competition;

    public CompetitionController(ICompetitionSessionService competition)
    {
        _competition = competition;
    }

    // 获取当前比赛会话快照，页面初始化和重连后都会读取它。
    [HttpGet("session")]
    public IActionResult GetSession() => Ok(_competition.GetState());

    // 根据配置页提交的秩序册、场次和人员列表创建新的比赛会话。
    [HttpPost("session")]
    public async Task<IActionResult> CreateSession([FromBody] CreateCompetitionSessionRequest request, CancellationToken cancellationToken)
    {
        try
        {
            return Ok(await _competition.CreateAsync(request, cancellationToken));
        }
        catch (Exception ex)
        {
            return BadRequest(new { message = ex.Message });
        }
    }

    [HttpPost("rounds/{roundIndex:int}/select")]
    public async Task<IActionResult> SelectRound(int roundIndex, CancellationToken cancellationToken)
    {
        try
        {
            return Ok(await _competition.SelectRoundAsync(roundIndex, cancellationToken));
        }
        catch (Exception ex)
        {
            return BadRequest(new { message = ex.Message });
        }
    }

    [HttpPost("rounds/next")]
    public async Task<IActionResult> NextRound(CancellationToken cancellationToken)
    {
        try
        {
            return Ok(await _competition.SelectNextRoundAsync(cancellationToken));
        }
        catch (Exception ex)
        {
            return BadRequest(new { message = ex.Message });
        }
    }

    [HttpPost("rounds/previous")]
    public async Task<IActionResult> PreviousRound(CancellationToken cancellationToken)
    {
        try
        {
            return Ok(await _competition.SelectPreviousRoundAsync(cancellationToken));
        }
        catch (Exception ex)
        {
            return BadRequest(new { message = ex.Message });
        }
    }

    [HttpPost("rounds/current/download")]
    public async Task<IActionResult> DownloadCurrentRound(CancellationToken cancellationToken)
    {
        try
        {
            return Ok(await _competition.DownloadCurrentRoundAsync(cancellationToken));
        }
        catch (Exception ex)
        {
            return BadRequest(new { message = ex.Message });
        }
    }

    // 下发开始命令，让已下载本场的终端进入正式测试。
    [HttpPost("test/start")]
    public async Task<IActionResult> Start(CancellationToken cancellationToken)
    {
        try
        {
            return Ok(await _competition.StartAsync(cancellationToken));
        }
        catch (Exception ex)
        {
            return BadRequest(new { message = ex.Message });
        }
    }

    // 下发停止命令，但保留终端当前成绩。
    [HttpPost("test/stop")]
    public async Task<IActionResult> Stop(CancellationToken cancellationToken)
    {
        try
        {
            return Ok(await _competition.StopAsync(cancellationToken));
        }
        catch (Exception ex)
        {
            return BadRequest(new { message = ex.Message });
        }
    }

    // 下发清零命令，并把当前场次的本地成绩也一起清空。
    [HttpPost("test/reset")]
    public async Task<IActionResult> Reset(CancellationToken cancellationToken)
    {
        try
        {
            return Ok(await _competition.ResetCurrentRoundAsync(cancellationToken));
        }
        catch (Exception ex)
        {
            return BadRequest(new { message = ex.Message });
        }
    }

    // 手工指定某名选手成绩，主要用于裁判修正。
    [HttpPost("participants/{participantId:int}/count")]
    public async Task<IActionResult> SetCount(int participantId, [FromBody] CompetitionParticipantCountRequest request, CancellationToken cancellationToken)
    {
        try
        {
            return Ok(await _competition.SetParticipantCountAsync(participantId, request.Count, cancellationToken));
        }
        catch (Exception ex)
        {
            return BadRequest(new { message = ex.Message });
        }
    }

    // 在现有成绩基础上增减，适合前端 +/- 按钮。
    [HttpPost("participants/{participantId:int}/delta")]
    public async Task<IActionResult> ChangeCount(int participantId, [FromBody] CompetitionParticipantDeltaRequest request, CancellationToken cancellationToken)
    {
        try
        {
            return Ok(await _competition.ChangeParticipantCountAsync(participantId, request.Delta, cancellationToken));
        }
        catch (Exception ex)
        {
            return BadRequest(new { message = ex.Message });
        }
    }
}