using YD_Event.Application.Event.Dtos;
using YD_Event.Core.Entities;
using YD_Event.Core.Enum;
using SqlSugar;
using Mapster;
using YD_Event.Application.Auth;
using Furion.DynamicApiController;
using Microsoft.AspNetCore.Mvc;
using YD_Event.Application.File;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Authorization;
using System.ComponentModel;

namespace YD_Event.Application.Event;

/// <summary>
/// 用户端赛事报名服务
/// </summary>
public class UserCompetitionService : IDynamicApiController, ITransient
{
    private readonly ISqlSugarRepository<EventInfo> _eventRepository;
    private readonly ISqlSugarRepository<EventUnit> _unitRepository;
    private readonly ISqlSugarRepository<YD_Event.Core.Entities.Project> _projectRepository;
    private readonly ISqlSugarRepository<EventRegistration> _registrationRepository;
    private readonly ISqlSugarRepository<EventRegistrationItem> _registrationItemRepository;
    private readonly ISqlSugarRepository<EventRegistrationPerson> _registrationPersonRepository;
    private readonly ISqlSugarRepository<YD_Event.Core.Entities.AppUser> _userRepository;
    private readonly ISqlSugarRepository<EventFeeConfig> _feeConfigRepository;
    private readonly ISqlSugarRepository<EventRegistrationLimit> _limitRepository;
    private readonly ISqlSugarRepository<PointsRule> _pointsRuleRepository;
    private readonly ISqlSugarRepository<EventRegistrationPayment> _paymentRepository;
    private readonly ISqlSugarRepository<EventCertificate> _certificateRepository;
    private readonly AuthManager _authManager;
    private readonly IIdGenerator _idGenerator;
    private readonly FileService _fileService;

    public UserCompetitionService(
        ISqlSugarRepository<EventInfo> eventRepository,
        ISqlSugarRepository<EventUnit> unitRepository,
        ISqlSugarRepository<YD_Event.Core.Entities.Project> projectRepository,
        ISqlSugarRepository<EventRegistration> registrationRepository,
        ISqlSugarRepository<EventRegistrationItem> registrationItemRepository,
        ISqlSugarRepository<EventRegistrationPerson> registrationPersonRepository,
        ISqlSugarRepository<YD_Event.Core.Entities.AppUser> userRepository,
        ISqlSugarRepository<EventFeeConfig> feeConfigRepository,
        ISqlSugarRepository<EventRegistrationLimit> limitRepository,
        ISqlSugarRepository<PointsRule> pointsRuleRepository,
        ISqlSugarRepository<EventRegistrationPayment> paymentRepository,
        ISqlSugarRepository<EventCertificate> certificateRepository,
        AuthManager authManager,
        IIdGenerator idGenerator,
        FileService fileService)
    {
        _eventRepository = eventRepository;
        _unitRepository = unitRepository;
        _projectRepository = projectRepository;
        _registrationRepository = registrationRepository;
        _registrationItemRepository = registrationItemRepository;
        _registrationPersonRepository = registrationPersonRepository;
        _userRepository = userRepository;
        _feeConfigRepository = feeConfigRepository;
        _limitRepository = limitRepository;
        _pointsRuleRepository = pointsRuleRepository;
        _paymentRepository = paymentRepository;
        _certificateRepository = certificateRepository;
        _authManager = authManager;
        _idGenerator = idGenerator;
        _fileService = fileService;
    }

    /// <summary>
    /// 1. 赛事列表展示接口
    /// </summary>
    [DisplayName("赛事列表展示")]
    [HttpGet("list")]
    public async Task<PageResult<UserEventListOutput>> Page([FromQuery] UserEventQueryInput input)
    {
        var query = _eventRepository.AsQueryable()
            .Where(x => x.Status == AvailabilityStatus.Enable)
            .WhereIF(!string.IsNullOrWhiteSpace(input.Keyword), x => x.EventName.Contains(input.Keyword))
            .WhereIF(input.Status.HasValue && input.Status != 0, x => x.EventStatus == input.Status)
            .WhereIF(input.Type.HasValue, x => x.EventType == input.Type)
            .WhereIF(input.StartTime.HasValue, x => x.MatchStartTime >= input.StartTime)
            .WhereIF(input.EndTime.HasValue, x => x.MatchEndTime <= input.EndTime)
            .OrderByDescending(x => x.CreatedTime);

        return await query.Select(x => new UserEventListOutput
        {
            Id = x.Id,
            Name = x.EventName,
            CoverImage = x.CoverImage,
            Status = x.EventStatus.ToString(), 
            Type = x.EventType.ToString(),
            RegistrationEndTime = x.RegistrationEndTime,
            MatchStartTime = x.MatchStartTime,
            MatchEndTime = x.MatchEndTime
        }).ToPagedListAsync(input);
    }

    /// <summary>
    /// 2. 赛事详情查看接口
    /// </summary>
    [DisplayName("赛事详情查看")]
    [HttpGet("detail/{id}")]
    public async Task<UserEventDetailOutput> Detail([FromRoute] long id)
    {
        var eventInfo = await _eventRepository.GetByIdAsync(id);
        if (eventInfo == null) throw Oops.Bah("赛事不存在");

        var output = eventInfo.Adapt<UserEventDetailOutput>();
        output.Name = eventInfo.EventName;
        output.Description = eventInfo.EventIntroduction; 
        output.Address = eventInfo.DetailAddress;
        output.EventVideo = eventInfo.EventVideo;
        output.RegistrationType = eventInfo.RegistrationType.ToString();
        output.IsNeedMaterial = eventInfo.IsNeedMaterial;
        output.MaterialRemark = eventInfo.MaterialRemark;
        output.MaterialUploadEndTime = eventInfo.MaterialUploadEndTime;

        if (eventInfo.PointsRuleId.HasValue)
        {
            var rule = await _pointsRuleRepository.GetByIdAsync(eventInfo.PointsRuleId.Value);
            output.PointsRuleName = rule?.RuleName ?? "";
        }

        var units = await _unitRepository.GetListAsync(x => x.EventId == id);
        output.Units = units.OrderBy(x => x.Sort).Select(x => x.Adapt<EventUnitDto>()).ToList();

        var limit = await _limitRepository.GetFirstAsync(x => x.EventId == id);
        if (limit != null)
        {
            output.LimitConfig = new UserEventLimitOutput
            {
                IndividualProjectLimit = limit.IndividualProjectLimit,
                TeamProjectLimit = limit.TeamProjectLimit
            };
        }

        var fee = await _feeConfigRepository.GetFirstAsync(x => x.EventId == id);
        if (fee != null)
        {
            output.FeeConfig = new UserEventFeeOutput
            {
                ChargeMode = fee.ChargeMode.ToString(),
                Price = fee.Price
            };
        }

        var projects = await _projectRepository.GetListAsync(x => x.EventId == id && x.Status == AvailabilityStatus.Enable);
        output.Projects = projects.Select(p => new UserEventProjectListOutput
        {
            Id = p.Id,
            Name = p.Name,
            Fee = p.Fee,
            CompletionCount = p.CompletionCount
        }).ToList();

        var userId = _authManager.UserId;
        var registration = await _registrationRepository.GetFirstAsync(x => x.EventId == id && x.CreatedUserId == userId && !x.DeleteMark);
        
        if (registration != null)
        {
            output.RegistrationId = registration.Id;
            output.UserRegistrationStatus = GetRegistrationStatusDesc(registration.RegistrationStatus);
        }
        else
        {
            output.UserRegistrationStatus = "未报名";
        }

        return output;
    }

    /// <summary>
    /// 3.1 选择报名项目接口
    /// </summary>
    [DisplayName("选择报名项目")]
    [HttpGet("projects/{eventId}")]
    public async Task<List<UserEventProjectListOutput>> GetProjects([FromRoute] long eventId)
    {
        var projects = await _projectRepository.GetListAsync(x => x.EventId == eventId && x.Status == AvailabilityStatus.Enable);
        
        return projects.Select(p => new UserEventProjectListOutput
        {
            Id = p.Id,
            Name = p.Name,
            Fee = p.Fee,
            TeamSize = 1, // 默认为1
            CompletionCount = p.CompletionCount
        }).ToList();
    }

    /// <summary>
    /// 3.2 分配队员接口 - 搜索队员
    /// </summary>
    [DisplayName("搜索队员")]
    [HttpGet("members/search")]
    public async Task<List<UserTeamMemberOutput>> SearchMembers([FromQuery] string keyword)
    {
        if (string.IsNullOrWhiteSpace(keyword)) return new List<UserTeamMemberOutput>();

        var users = await _userRepository.AsQueryable()
            .Where(x => (x.Mobile.Contains(keyword) || x.Id.ToString() == keyword) && !x.DeleteMark)
            .Take(10)
            .ToListAsync();

        return users.Select(u => new UserTeamMemberOutput
        {
            UserId = u.Id,
            Name = u.Name,
            Mobile = u.Mobile,
            IdCard = MaskIdCard(u.IdCardNumber),
            Gender = u.Gender.ToString(),
            IsEligible = true,
            IneligibilityReason = ""
        }).ToList();
    }

    private string MaskIdCard(string idCard)
    {
        if (string.IsNullOrEmpty(idCard) || idCard.Length < 10) return idCard;
        return idCard.Substring(0, 6) + "********" + idCard.Substring(idCard.Length - 4);
    }

    /// <summary>
    /// 3.2 分配队员接口 - 提交报名（含保存草稿）
    /// </summary>
    [DisplayName("提交报名")]
    [HttpPost("submit")]
    [UnitOfWork]
    public async Task<long> SubmitRegistration([FromBody] UserSubmitRegistrationInput input)
    {
        var userId = _authManager.UserId;
        var user = await _userRepository.GetByIdAsync(userId);
        if (user == null) throw Oops.Bah("用户不存在");
        
        var eventInfo = await _eventRepository.GetByIdAsync(input.EventId);
        if (eventInfo == null) throw Oops.Bah("赛事不存在");

        var registration = await _registrationRepository.GetFirstAsync(x => x.EventId == input.EventId && x.CreatedUserId == userId && !x.DeleteMark);
        
        if (registration == null)
        {
            registration = new EventRegistration
            {
                Id = _idGenerator.NewLong(),
                EventId = input.EventId,
                CreatedUserId = userId,
                CreatedTime = DateTime.Now,
                Status = AvailabilityStatus.Enable,
                RegistrationStatus = input.IsDraft ? 0 : 1, // 0-待提交(草稿), 1-待审核
                ContactName = user.Name,
                ContactPhone = user.Mobile,
                OrderNo = "",
                RegistrationMode = 1
            };
            await _registrationRepository.InsertAsync(registration);
        }
        else
        {
            registration.RegistrationStatus = input.IsDraft ? 0 : 1;
            registration.ContactName = user.Name;
            registration.ContactPhone = user.Mobile;
            registration.UpdatedTime = DateTime.Now;
            registration.UpdatedUserId = userId;
            await _registrationRepository.UpdateAsync(registration);
        }

        await _registrationItemRepository.DeleteAsync(x => x.RegistrationId == registration.Id);
        await _registrationPersonRepository.DeleteAsync(x => x.RegistrationId == registration.Id);
        
        var projects = await _projectRepository.GetListAsync(x => input.ProjectIds.Contains(x.Id));
        var members = await _userRepository.GetListAsync(x => input.MemberIds.Contains(x.Id));

        decimal totalAmount = 0;
        int totalPersonCount = 0;

        foreach (var project in projects)
        {
            var item = new EventRegistrationItem
            {
                Id = _idGenerator.NewLong(),
                RegistrationId = registration.Id,
                ProjectId = project.Id,
                ProjectName = project.Name,
                UnitPrice = project.Fee,
                PersonCount = members.Count(),
                TotalPrice = project.Fee * members.Count(),
                CreatedUserId = userId,
                CreatedTime = DateTime.Now
            };
            await _registrationItemRepository.InsertAsync(item);
            
            totalAmount += item.TotalPrice;
            totalPersonCount += item.PersonCount;

            foreach (var member in members)
            {
                var person = new EventRegistrationPerson
                {
                    Id = _idGenerator.NewLong(),
                    RegistrationId = registration.Id,
                    RegistrationItemId = item.Id,
                    ProjectId = project.Id,
                    Name = member.Name,
                    Gender = member.Gender,
                    IdCard = member.IdCardNumber,
                    Phone = member.Mobile,
                    Age = member.Age, 
                    BirthDate = member.BirthDate ?? DateTime.MinValue,
                    PersonType = 1,
                    CreatedUserId = userId,
                    CreatedTime = DateTime.Now
                };
                await _registrationPersonRepository.InsertAsync(person);
            }
        }

        registration.TotalAmount = totalAmount;
        registration.TotalPersonCount = totalPersonCount;
        await _registrationRepository.UpdateAsync(registration);

        return registration.Id;
    }

    /// <summary>
    /// 3.3 预览支付接口
    /// </summary>
    [DisplayName("预览支付")]
    [HttpGet("preview/{registrationId}")]
    public async Task<UserOrderPreviewOutput> PreviewOrder([FromRoute] long registrationId)
    {
        var registration = await _registrationRepository.GetByIdAsync(registrationId);
        if (registration == null) throw Oops.Bah("报名信息不存在");

        var eventInfo = await _eventRepository.GetByIdAsync(registration.EventId);
        var items = await _registrationItemRepository.GetListAsync(x => x.RegistrationId == registrationId);
        var persons = await _registrationPersonRepository.GetListAsync(x => x.RegistrationId == registrationId);

        var projectOutputs = items.Select(i => new UserEventProjectListOutput
        {
            Id = i.ProjectId,
            Name = i.ProjectName,
            Fee = i.UnitPrice,
            RegisteredCount = i.PersonCount
        }).ToList();

        var memberOutputs = persons.DistinctBy(p => p.IdCard).Select(p => new UserTeamMemberOutput
        {
            Name = p.Name,
            Mobile = p.Phone,
            IdCard = MaskIdCard(p.IdCard),
            Gender = p.Gender.ToString()
        }).ToList();

        return new UserOrderPreviewOutput
        {
            EventId = eventInfo.Id,
            EventName = eventInfo.EventName,
            Projects = projectOutputs,
            Members = memberOutputs,
            TotalAmount = registration.TotalAmount,
            FeeDetails = new Dictionary<string, decimal> { { "报名费", registration.TotalAmount } }
        };
    }

    /// <summary>
    /// 创建支付订单
    /// </summary>
    [DisplayName("创建支付订单")]
    [HttpPost("order/create")]
    [UnitOfWork]
    public async Task<UserPaymentResultOutput> CreateOrder([FromBody] UserCreateOrderInput input)
    {
        var registration = await _registrationRepository.GetByIdAsync(input.RegistrationId);
        if (registration == null) throw Oops.Bah("报名信息不存在");

        var orderNo = _idGenerator.NewLong().ToString();
        registration.OrderNo = orderNo;
        registration.PaymentMethod = input.PaymentMethod;
        registration.PaymentStatus = 0; // 未支付
        await _registrationRepository.UpdateAsync(registration);

        return new UserPaymentResultOutput
        {
            OrderNo = orderNo,
            PayUrl = "http://mock-pay-url.com/" + orderNo,
            Status = 0
        };
    }

    #region 参赛记录相关

    /// <summary>
    /// 1. 列表查询
    /// </summary>
    [DisplayName("参赛记录列表查询")]
    [HttpGet("/event/pc/registration/list")]
    [Authorize(Roles = "PC_USER")]
    public async Task<PageResult<RegistrationItemDTO>> GetRegistrationList([FromQuery] RegistrationListQueryInput input)
    {
        var userId = _authManager.UserId;
        var query = _registrationRepository.AsQueryable()
            .InnerJoin<EventInfo>((r, e) => r.EventId == e.Id)
            .Where((r, e) => r.CreatedUserId == userId && !r.DeleteMark)
            .WhereIF(input.EventId.HasValue, (r, e) => r.EventId == input.EventId)
            .WhereIF(!string.IsNullOrWhiteSpace(input.Keyword), (r, e) => r.TeamName.Contains(input.Keyword) || e.EventName.Contains(input.Keyword))
            .OrderByDescending((r, e) => r.CreatedTime)
            .Select((r, e) => new RegistrationItemDTO
            {
                RegistrationId = r.Id,
                EventName = e.EventName,
                TeamName = r.TeamName,
                CreateTime = r.CreatedTime,
                UpdateTime = r.UpdatedTime,
                PayStatus = r.PaymentStatus == 1 ? "已支付" : "待付款", // 简化映射
                CertStatus = "未颁发", // 暂无证书逻辑
                HasMaterial = SqlFunc.HasValue(r.MaterialUrl),
                HasVoucher = SqlFunc.HasValue(r.PaymentProofUrl),
                MemberCount = r.TotalPersonCount,
                MaxMember = 10, // 假设
                ExpireTime = e.MaterialUploadEndTime
            });

        // 这里需要先把数据查出来再做复杂的状态转换，因为 SqlSugar Select 中不能写太复杂的 switch
        var pagedResult = await query.ToPagedListAsync(input);

        // 二次处理状态描述
        foreach (var item in pagedResult.Rows)
        {
            // 状态映射逻辑
            // status ∈ (待付款, 待上传素材, 已取消, 已报名, 待审核)
            // 假设：RegStatus=4 -> 已取消
            // RegStatus=1 -> 待审核
            // PayStatus=0 -> 待付款
            // PayStatus=1 && !HasMaterial -> 待上传素材
            // PayStatus=1 && HasMaterial -> 已报名
            
            // 注意：这里需要再次查询原始状态值才能准确判断，上面的Select只映射了部分。
            // 优化：Select时把原始状态值带出来
            // 重新查询一遍原始数据比较准确
        }

        // 重新构建查询以支持复杂逻辑
        var list = await _registrationRepository.AsQueryable()
            .InnerJoin<EventInfo>((r, e) => r.EventId == e.Id)
            .Where((r, e) => r.CreatedUserId == userId && !r.DeleteMark)
            .WhereIF(input.EventId.HasValue, (r, e) => r.EventId == input.EventId)
            .WhereIF(!string.IsNullOrWhiteSpace(input.Keyword), (r, e) => r.TeamName.Contains(input.Keyword) || e.EventName.Contains(input.Keyword))
            .OrderByDescending((r, e) => r.CreatedTime)
            .Select((r, e) => new 
            {
                r.Id, r.EventId, e.EventName, r.TeamName, r.RegistrationStatus, r.PaymentStatus, r.MaterialUrl, r.PaymentProofUrl, 
                r.CreatedTime, r.UpdatedTime, r.TotalPersonCount, e.MaterialUploadEndTime
            })
            .ToPagedListAsync(input);

        var resultItems = list.Rows.Select(x => {
            string statusDesc = "未知";
            if (x.RegistrationStatus == 4) statusDesc = "已取消";
            else if (x.RegistrationStatus == 1) statusDesc = "待审核"; // 假设1是待审核
            else if (x.PaymentStatus == 0) statusDesc = "待付款";
            else if (x.PaymentStatus == 1 && string.IsNullOrEmpty(x.MaterialUrl)) statusDesc = "待上传素材";
            else if (x.PaymentStatus == 1 && !string.IsNullOrEmpty(x.MaterialUrl)) statusDesc = "已报名"; // 或已完成
            
            return new RegistrationItemDTO
            {
                RegistrationId = x.Id,
                EventName = x.EventName,
                TeamName = x.TeamName,
                Status = statusDesc,
                CreateTime = x.CreatedTime,
                UpdateTime = x.UpdatedTime,
                PayStatus = x.PaymentStatus == 1 ? "已支付" : (x.PaymentStatus == 4 ? "待审核" : "待付款"),
                CertStatus = "未颁发",
                HasMaterial = !string.IsNullOrEmpty(x.MaterialUrl),
                HasVoucher = !string.IsNullOrEmpty(x.PaymentProofUrl),
                MemberCount = x.TotalPersonCount,
                MaxMember = 10,
                ExpireTime = x.MaterialUploadEndTime
            };
        }).ToList();

        return new PageResult<RegistrationItemDTO>
        {
            PageNo = list.PageNo,
            PageSize = list.PageSize,
            Total = list.Total,
            Pages = list.Pages,
            Rows = resultItems
        };
    }

    /// <summary>
    /// 2. 取消报名
    /// </summary>
    [DisplayName("取消报名")]
    [HttpPut("/event/pc/registration/{registrationId}/cancel")]
    [Authorize(Roles = "PC_USER")]
    [UnitOfWork]
    public async Task<ResponseDTO<bool>> CancelRegistration([FromRoute] long registrationId)
    {
        var userId = _authManager.UserId;
        var registration = await _registrationRepository.GetFirstAsync(x => x.Id == registrationId && x.CreatedUserId == userId);
        if (registration == null) throw Oops.Bah("报名记录不存在");

        // 仅允许 status ∈ (待付款, 待上传素材) 可取消
        // 待付款: PayStatus == 0
        // 待上传素材: PayStatus == 1 && !HasMaterial
        // 已取消: RegStatus == 4
        if (registration.RegistrationStatus == 4) throw Oops.Bah("订单已取消");

        bool canCancel = false;
        if (registration.PaymentStatus == 0) canCancel = true;
        else if (registration.PaymentStatus == 1 && string.IsNullOrEmpty(registration.MaterialUrl)) canCancel = true;

        if (!canCancel)
        {
             // 已付款且已上传素材的报名需走退赛流程
             throw Oops.Bah("当前状态无法直接取消，请联系管理员退赛");
        }

        registration.RegistrationStatus = 4; // 已取消
        registration.UpdatedUserId = userId;
        registration.UpdatedTime = DateTime.Now;
        // registration.CancelReason = "用户主动取消"; // 需扩展字段
        await _registrationRepository.UpdateAsync(registration);
        
        // 记录日志 (暂不需要)
        /*
        await _eventLogRepository.InsertAsync(new EventLog
        {
            RegistrationId = registration.Id,
            LogType = EventLogType.Cancel,
            Description = "用户取消报名",
            OperatorId = userId,
            CreatedTime = DateTime.Now
        });
        */

        return new ResponseDTO<bool> { Code = 200, Success = true, Data = true, Message = "取消成功" };
    }

    /// <summary>
    /// 3. 上传素材
    /// </summary>
    [DisplayName("上传素材")]
    [HttpPost("/event/pc/registration/{registrationId}/material")]
    [Authorize(Roles = "PC_USER")]
    [UnitOfWork]
    public async Task<ResponseDTO<List<MaterialDTO>>> UploadMaterial([FromRoute] long registrationId, [FromForm] UploadMaterialInput input)
    {
        var userId = _authManager.UserId;
        var registration = await _registrationRepository.GetFirstAsync(x => x.Id == registrationId && x.CreatedUserId == userId);
        if (registration == null) throw Oops.Bah("报名记录不存在");

        // 仅 status = 待上传素材 或 已上传素材 允许再次上传
        // 即 PayStatus == 1 (已支付)
        if (registration.PaymentStatus != 1) throw Oops.Bah("未支付或状态不正确，无法上传素材");
        
        // 总素材大小累计不超过 100 MB (简化校验，假设单次)
        long totalSize = input.Files.Sum(f => f.Length);
        if (totalSize > 100 * 1024 * 1024) throw Oops.Bah("素材总大小超过100MB");

        var result = new List<MaterialDTO>();
        foreach (var file in input.Files)
        {
            var uploadResult = await _fileService.Upload(file); // 假设 FileService 支持 IFormFile
            var item = uploadResult.FirstOrDefault(); // 假设返回 List
            if (item != null)
            {
                result.Add(new MaterialDTO
                {
                    MaterialId = _idGenerator.NewLong().ToString(),
                    OssUrl = item.Url,
                    FileName = item.Name,
                    FileSize = file.Length,
                    UploadTime = DateTime.Now
                });
            }
        }

        if (result.Any())
        {
            registration.MaterialUrl = result.First().OssUrl; // 更新主表
            await _registrationRepository.UpdateAsync(registration);
            
            // 记录日志 (暂不需要)
            /*
            await _eventLogRepository.InsertAsync(new EventLog
            {
                RegistrationId = registration.Id,
                LogType = EventLogType.UploadMaterial,
                Description = $"用户上传素材: {result.Count}个文件",
                OperatorId = userId,
                CreatedTime = DateTime.Now
            });
            */
        }

        return new ResponseDTO<List<MaterialDTO>> { Code = 200, Success = true, Data = result, Message = "上传成功" };
    }

    /// <summary>
    /// 4. 上传付款凭证
    /// </summary>
    [DisplayName("上传付款凭证")]
    [HttpPost("/event/pc/registration/{registrationId}/voucher")]
    [Authorize(Roles = "PC_USER")]
    [UnitOfWork]
    public async Task<ResponseDTO<VoucherDTO>> UploadVoucher([FromRoute] long registrationId, [FromForm] UploadVoucherInput input)
    {
        var userId = _authManager.UserId;
        var registration = await _registrationRepository.GetFirstAsync(x => x.Id == registrationId && x.CreatedUserId == userId);
        if (registration == null) throw Oops.Bah("报名记录不存在");

        // 仅 status = 待付款 允许上传
        if (registration.PaymentStatus != 0) throw Oops.Bah("当前状态不允许上传凭证");

        var uploadResult = await _fileService.Upload(input.File);
        var fileInfo = uploadResult.First();

        registration.PaymentProofUrl = fileInfo.Url;
        registration.PaymentStatus = 4; // 假设 4 = 待审核
        registration.UpdatedTime = DateTime.Now;
        // registration.VoucherUploadTime = DateTime.Now;
        await _registrationRepository.UpdateAsync(registration);
        
        // 记录日志 (暂不需要)
        /*
        await _eventLogRepository.InsertAsync(new EventLog
        {
            RegistrationId = registration.Id,
            LogType = EventLogType.UploadVoucher,
            Description = "用户上传付款凭证",
            OperatorId = userId,
            CreatedTime = DateTime.Now
        });
        */

        return new ResponseDTO<VoucherDTO>
        {
            Code = 200, Success = true, Message = "上传成功",
            Data = new VoucherDTO
            {
                VoucherId = _idGenerator.NewLong().ToString(),
                OssUrl = fileInfo.Url,
                AuditStatus = "待审核"
            }
        };
    }

    /// <summary>
    /// 5.1 查看队员列表
    /// </summary>
    [DisplayName("查看队员列表")]
    [HttpGet("/event/pc/registration/{registrationId}/member")]
    [Authorize(Roles = "PC_USER")]
    public async Task<List<TeamMemberDTO>> GetTeamMembers([FromRoute] long registrationId)
    {
        var userId = _authManager.UserId;
        var registration = await _registrationRepository.GetFirstAsync(x => x.Id == registrationId && x.CreatedUserId == userId);
        if (registration == null) throw Oops.Bah("报名记录不存在");

        var persons = await _registrationPersonRepository.GetListAsync(x => x.RegistrationId == registrationId);
        
        // 需要关联 AppUser 获取更多信息 (Email 等)
        // 这里简化处理
        return persons.Select(p => new TeamMemberDTO
        {
            UserId = 0, // 需关联 AppUser
            RealName = p.Name,
            Phone = p.Phone,
            Email = "", // 暂无
            Role = p.PersonType == 3 ? "队长" : "队员", // 假设
            InviteStatus = "已加入",
            JoinTime = p.CreatedTime
        }).ToList();
    }

    /// <summary>
    /// 5.2 更换队员
    /// </summary>
    [DisplayName("更换队员")]
    [HttpPut("/event/pc/registration/{registrationId}/member/{userId}/replace")]
    [Authorize(Roles = "PC_USER")]
    [UnitOfWork]
    public async Task<ResponseDTO<bool>> ReplaceMember([FromRoute] long registrationId, [FromRoute] long userId, [FromBody] ReplaceMemberInput input)
    {
        var currentUserId = _authManager.UserId;
        // 校验队长权限: 仅创建者(队长)可操作
        var registration = await _registrationRepository.GetFirstAsync(x => x.Id == registrationId && x.CreatedUserId == currentUserId);
        if (registration == null) throw Oops.Bah("无权操作或记录不存在");
        
        var person = await _registrationPersonRepository.GetFirstAsync(x => x.RegistrationId == registrationId && x.Id == userId);
        if (person == null) throw Oops.Bah("队员不存在");

        // 被替换人 role ≠ 队长 (假设 PersonType=3 是队长)
        if (person.PersonType == 3) throw Oops.Bah("不能替换队长");

        // 检查新队员
        var newUser = await _userRepository.GetByIdAsync(input.NewUserId);
        if (newUser == null) throw Oops.Bah("新队员不存在");
        
        // 检查新队员是否已报名该赛事 (简化检查: 是否在 Person 表中存在该 EventId 的记录)
        // var exists = await _registrationPersonRepository.AnyAsync(x => x.EventId == registration.EventId && x.IdCard == newUser.IdCardNumber);
        // if (exists) throw Oops.Bah("新队员已报名该赛事");

        long oldUserId = person.Id; // 这里应该是 AppUserId，但 Person 表没存 AppUserId，只存了 Name/Phone
        
        // 更新信息
        person.Name = newUser.Name;
        person.IdCard = newUser.IdCardNumber;
        person.Phone = newUser.Mobile;
        person.UpdatedTime = DateTime.Now;
        await _registrationPersonRepository.UpdateAsync(person);
        
        // 记录日志 (暂不需要)
        /*
        await _eventLogRepository.InsertAsync(new EventLog
        {
            RegistrationId = registration.Id,
            LogType = EventLogType.ReplaceMember,
            Description = $"更换队员: {oldUserId} -> {input.NewUserId}",
            OperatorId = currentUserId,
            CreatedTime = DateTime.Now
        });
        */

        return new ResponseDTO<bool> { Code = 200, Success = true, Data = true, Message = "更换成功" };
    }

    /// <summary>
    /// 6. 查看证书
    /// </summary>
    [DisplayName("查看证书")]
    [HttpGet("/event/pc/registration/{registrationId}/certificate")]
    [Authorize(Roles = "PC_USER")]
    public async Task<ResponseDTO<CertificateDTO>> GetCertificate([FromRoute] long registrationId)
    {
        // 2-已发放
        var cert = await _certificateRepository.GetFirstAsync(x => x.RegistrationId == registrationId && x.CertificateStatus == 2); 
        if (cert == null) return new ResponseDTO<CertificateDTO> { Code = 404, Message = "证书未颁发", Success = false };

        return new ResponseDTO<CertificateDTO>
        {
            Code = 200, Success = true,
            Data = new CertificateDTO
            {
                CertUrl = cert.CertificateUrl + "?sas_token=mock_10min_token", // 模拟带签名 URL
                CertNumber = cert.CertificateNo,
                IssueTime = cert.IssuedTime ?? DateTime.MinValue,
                ExpireTime = null
            }
        };
    }

    #endregion

    private string GetRegistrationStatusDesc(int status)
    {
        return status switch
        {
            0 => "待提交",
            1 => "审核中",
            2 => "已报名",
            3 => "审核拒绝",
            4 => "已取消",
            _ => "未知"
        };
    }
}