using YD_Event.Application.Event.Dtos;
using YD_Event.Core.Entities;
using MiniExcelLibs;

namespace YD_Event.Application.Event;

/// <summary>
/// 赛事管理服务
/// </summary>
public class EventService : BaseService<EventInfo>, ITransient
{
    private readonly ISqlSugarRepository<EventInfo> _repository;
    private readonly ISqlSugarRepository<EventParticipant> _participantRepository;
    private readonly ISqlSugarRepository<EventCustomField> _customFieldRepository;
    private readonly ISqlSugarRepository<Sys_Province> _provinceRepository;
    private readonly ISqlSugarRepository<Sys_City> _cityRepository;
    private readonly ISqlSugarRepository<Sys_District> _districtRepository;
    private readonly ISqlSugarRepository<EventProject> _projectRepository;
    private readonly ISqlSugarRepository<EventProjectGroup> _projectGroupRepository;
    private readonly ISqlSugarRepository<EventRegistrationLimit> _registrationLimitRepository;
    private readonly ISqlSugarRepository<EventProjectRegistrationLimit> _projectLimitRepository;
    private readonly ISqlSugarRepository<EventFeeConfig> _feeConfigRepository;
    private readonly ISqlSugarRepository<EventRegistration> _registrationRepository;
    private readonly ISqlSugarRepository<YD_Event.Core.Entities.Merchant> _merchantRepository;
    private readonly IIdGenerator _idGenerator;

    public EventService(
        ISqlSugarRepository<EventInfo> repository,
        ISqlSugarRepository<EventParticipant> participantRepository,
        ISqlSugarRepository<EventCustomField> customFieldRepository,
        ISqlSugarRepository<Sys_Province> provinceRepository,
        ISqlSugarRepository<Sys_City> cityRepository,
        ISqlSugarRepository<Sys_District> districtRepository,
        ISqlSugarRepository<EventProject> projectRepository,
        ISqlSugarRepository<EventProjectGroup> projectGroupRepository,
        ISqlSugarRepository<EventRegistrationLimit> registrationLimitRepository,
        ISqlSugarRepository<EventProjectRegistrationLimit> projectLimitRepository,
        ISqlSugarRepository<EventFeeConfig> feeConfigRepository,
        ISqlSugarRepository<EventRegistration> registrationRepository,
        ISqlSugarRepository<YD_Event.Core.Entities.Merchant> merchantRepository,
        IIdGenerator idGenerator) : base(repository)
    {
        _repository = repository;
        _participantRepository = participantRepository;
        _customFieldRepository = customFieldRepository;
        _provinceRepository = provinceRepository;
        _cityRepository = cityRepository;
        _districtRepository = districtRepository;
        _projectRepository = projectRepository;
        _projectGroupRepository = projectGroupRepository;
        _registrationLimitRepository = registrationLimitRepository;
        _projectLimitRepository = projectLimitRepository;
        _feeConfigRepository = feeConfigRepository;
        _registrationRepository = registrationRepository;
        _merchantRepository = merchantRepository;
        _idGenerator = idGenerator;
    }

    /// <summary>
    /// 分页查询赛事
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    [DisplayName("分页查询赛事")]
    public async Task<PageResult<EventListOutput>> Page(EventQueryInput input)
    {
        var query = _repository.AsQueryable()
            .WhereIF(!string.IsNullOrWhiteSpace(input.EventName), x => x.EventName.Contains(input.EventName))
            .WhereIF(input.EventType.HasValue, x => x.EventType == input.EventType)
            .WhereIF(input.ChargeMode.HasValue, x => x.ChargeMode == input.ChargeMode)
            .WhereIF(input.EventStatus.HasValue, x => x.EventStatus == input.EventStatus)
            .WhereIF(input.RegistrationStartTime.HasValue, x => x.RegistrationStartTime >= input.RegistrationStartTime)
            .WhereIF(input.RegistrationEndTime.HasValue, x => x.RegistrationEndTime <= input.RegistrationEndTime)
            .WhereIF(input.MatchStartTime.HasValue, x => x.MatchStartTime >= input.MatchStartTime)
            .WhereIF(input.MatchEndTime.HasValue, x => x.MatchEndTime <= input.MatchEndTime)
            .OrderByDescending(x => x.CreatedTime)
            .Select(x => new EventListOutput
            {
                Id = x.Id,
                EventName = x.EventName,
                CoverImage = x.CoverImage,
                EventType = x.EventType,
                RegistrationType = x.RegistrationType,
                ChargeMode = x.ChargeMode,
                EventStatus = x.EventStatus,
                RegistrationStartTime = x.RegistrationStartTime,
                RegistrationEndTime = x.RegistrationEndTime,
                MatchStartTime = x.MatchStartTime,
                MatchEndTime = x.MatchEndTime,
                // AccountName 暂未关联
            });

        return await query.ToPagedListAsync(input);
    }

    /// <summary>
    /// 获取赛事详情
    /// </summary>
    /// <param name="id"></param>
    /// <returns></returns>
    [DisplayName("获取赛事详情")]
    public async Task<EventDetailOutput> GetDetail(long id)
    {
        var eventInfo = await _repository.GetByIdAsync(id);
        if (eventInfo == null) throw new InvalidOperationException("赛事不存在");

        var output = eventInfo.Adapt<EventDetailOutput>();

        // 1. 获取参与单位
        var participant = await _participantRepository.GetFirstAsync(x => x.EventId == id);
        if (participant != null)
        {
            output.Participant = participant.Adapt<EventParticipantInput>();
        }

        // 2. 获取自定义字段
        var customFields = await _customFieldRepository.GetListAsync(x => x.EventId == id);
        output.CustomFields = customFields.OrderBy(x => x.Sort).Select(x => x.FieldName).ToList();

        // 3. 获取区域名称
        if (output.ProvinceId > 0)
        {
            var p = await _provinceRepository.GetFirstAsync(x => x.ProvinceId == output.ProvinceId);
            output.ProvinceName = p?.ProvinceName;
        }
        if (output.CityId > 0)
        {
            var c = await _cityRepository.GetFirstAsync(x => x.CityId == output.CityId);
            output.CityName = c?.CityName;
        }
        if (output.DistrictId > 0)
        {
            var d = await _districtRepository.GetFirstAsync(x => x.DistrictId == output.DistrictId);
            output.DistrictName = d?.DistrictName;
        }

        // 4. 获取项目列表 (Step 3)
        var projects = await _projectRepository.GetListAsync(x => x.EventId == id);
        if (projects.Any())
        {
            var projectIds = projects.Select(x => x.Id).ToList();
            var groups = await _projectGroupRepository.GetListAsync(x => projectIds.Contains(x.ProjectId));
            var projectLimits = await _projectLimitRepository.GetListAsync(x => projectIds.Contains(x.ProjectId));

            output.Projects = projects.Select(p => 
            {
                var dto = p.Adapt<EventProjectInput>();
                dto.Groups = groups.Where(g => g.ProjectId == p.Id).Select(g => g.Adapt<EventProjectGroupInput>()).ToList();
                var limit = projectLimits.FirstOrDefault(l => l.ProjectId == p.Id);
                if (limit != null) dto.LimitCount = limit.LimitCount;
                return dto;
            }).ToList();
        }

        // 5. 获取报名限制 (Step 3)
        var registrationLimit = await _registrationLimitRepository.GetFirstAsync(x => x.EventId == id);
        if (registrationLimit != null)
        {
            output.RegistrationLimit = registrationLimit.Adapt<EventRegistrationLimitInput>();
        }

        // 6. 获取费用配置 (Step 4)
        var feeConfig = await _feeConfigRepository.GetFirstAsync(x => x.EventId == id);
        if (feeConfig != null)
        {
            output.FeeConfig = feeConfig.Adapt<EventFeeConfigInput>();
            // 获取商户详情
            if (feeConfig.MerchantId > 0)
            {
                var merchant = await _merchantRepository.GetByIdAsync(feeConfig.MerchantId);
                if (merchant != null)
                {
                    output.FeeConfig.MerchantName = merchant.MerchantName;
                    output.FeeConfig.CreditCode = merchant.CreditCode;
                    output.FeeConfig.BankName = merchant.BankName;
                    output.FeeConfig.AccountNumber = merchant.AccountNumber;
                }
            }
        }

        return output;
    }

    /// <summary>
    /// 新增赛事
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    [UnitOfWork]
    [DisplayName("新增赛事")]
    public async Task Add(AddEventInput input)
    {
        var eventInfo = input.Adapt<EventInfo>();
        eventInfo.Id = _idGenerator.NewLong();
        eventInfo.CreatedTime = DateTime.Now;
        eventInfo.Status = AvailabilityStatus.Enable;
        
        var now = DateTime.Now;
        if (now < eventInfo.RegistrationStartTime) eventInfo.EventStatus = EventStatus.Enrolling; 
        else if (now > eventInfo.MatchEndTime) eventInfo.EventStatus = EventStatus.Ended;
        else if (now >= eventInfo.MatchStartTime) eventInfo.EventStatus = EventStatus.Ongoing;
        else eventInfo.EventStatus = EventStatus.Enrolling;

        await _repository.InsertAsync(eventInfo);

        // 1. 保存参与单位
        if (input.Participant != null)
        {
            var participant = input.Participant.Adapt<EventParticipant>();
            participant.Id = _idGenerator.NewLong();
            participant.EventId = eventInfo.Id;
            await _participantRepository.InsertAsync(participant);
        }

        // 2. 保存自定义字段
        if (input.CustomFields != null && input.CustomFields.Any())
        {
            var fields = input.CustomFields.Select((name, index) => new EventCustomField
            {
                Id = _idGenerator.NewLong(),
                EventId = eventInfo.Id,
                FieldName = name,
                Sort = index
            }).ToList();
            await _customFieldRepository.InsertRangeAsync(fields);
        }

        // 3. 保存项目信息 (Step 3)
        if (input.Projects != null && input.Projects.Any())
        {
            foreach (var projInput in input.Projects)
            {
                var project = projInput.Adapt<EventProject>();
                project.Id = _idGenerator.NewLong();
                project.EventId = eventInfo.Id;
                project.Status = AvailabilityStatus.Enable;
                project.CreatedTime = DateTime.Now;
                await _projectRepository.InsertAsync(project);

                // 保存项目分组
                if (projInput.Groups != null && projInput.Groups.Any())
                {
                    var groups = projInput.Groups.Select(g => 
                    {
                        var group = g.Adapt<EventProjectGroup>();
                        group.Id = _idGenerator.NewLong();
                        group.ProjectId = project.Id;
                        return group;
                    }).ToList();
                    await _projectGroupRepository.InsertRangeAsync(groups);
                }

                // 保存项目报名限制 (Step 3 - Project Limit)
                if (projInput.LimitCount.HasValue)
                {
                    var projLimit = new EventProjectRegistrationLimit
                    {
                        Id = _idGenerator.NewLong(),
                        EventId = eventInfo.Id,
                        ProjectId = project.Id,
                        LimitCount = projInput.LimitCount.Value
                    };
                    await _projectLimitRepository.InsertAsync(projLimit);
                }
            }
        }

        // 4. 保存报名限制 (Step 3 - Individual/Team Limit)
        if (input.RegistrationLimit != null)
        {
            var limit = input.RegistrationLimit.Adapt<EventRegistrationLimit>();
            limit.Id = _idGenerator.NewLong();
            limit.EventId = eventInfo.Id;
            await _registrationLimitRepository.InsertAsync(limit);
        }

        // 5. 保存费用配置 (Step 4)
        if (input.FeeConfig != null)
        {
            var feeConfig = input.FeeConfig.Adapt<EventFeeConfig>();
            feeConfig.Id = _idGenerator.NewLong();
            feeConfig.EventId = eventInfo.Id;
            await _feeConfigRepository.InsertAsync(feeConfig);
        }
    }

    /// <summary>
    /// 更新赛事
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    [UnitOfWork]
    [DisplayName("更新赛事")]
    public async Task Update(UpdateEventInput input)
    {
        var eventInfo = await _repository.GetByIdAsync(input.Id);
        if (eventInfo == null) throw new InvalidOperationException("赛事不存在");

        var oldEventName = eventInfo.EventName;
        input.Adapt(eventInfo);
        eventInfo.EventName = oldEventName; // 赛事名称不允许修改
        
        eventInfo.UpdatedTime = DateTime.Now;
        
        // 更新状态逻辑（可选，每次更新重新计算）
        var now = DateTime.Now;
        if (now > eventInfo.MatchEndTime) eventInfo.EventStatus = EventStatus.Ended;
        else if (now >= eventInfo.MatchStartTime) eventInfo.EventStatus = EventStatus.Ongoing;
        else eventInfo.EventStatus = EventStatus.Enrolling;

        await _repository.UpdateAsync(eventInfo);

        // 1. 更新参与单位
        await _participantRepository.DeleteAsync(x => x.EventId == input.Id);
        if (input.Participant != null)
        {
            var participant = input.Participant.Adapt<EventParticipant>();
            participant.Id = _idGenerator.NewLong();
            participant.EventId = eventInfo.Id;
            await _participantRepository.InsertAsync(participant);
        }

        // 2. 更新自定义字段
        await _customFieldRepository.DeleteAsync(x => x.EventId == input.Id);
        if (input.CustomFields != null && input.CustomFields.Any())
        {
            var fields = input.CustomFields.Select((name, index) => new EventCustomField
            {
                Id = _idGenerator.NewLong(),
                EventId = eventInfo.Id,
                FieldName = name,
                Sort = index
            }).ToList();
            await _customFieldRepository.InsertRangeAsync(fields);
        }

        // 3. 更新项目信息
        // 策略：全量删除旧的，插入新的。简单可靠。
        // 获取旧项目ID列表，用于级联删除分组和限制
        var oldProjects = await _projectRepository.GetListAsync(x => x.EventId == input.Id);
        var oldProjectIds = oldProjects.Select(x => x.Id).ToList();
        
        if (oldProjectIds.Any())
        {
            await _projectGroupRepository.DeleteAsync(x => oldProjectIds.Contains(x.ProjectId));
            await _projectLimitRepository.DeleteAsync(x => oldProjectIds.Contains(x.ProjectId));
            await _projectRepository.DeleteAsync(x => x.EventId == input.Id);
        }

        if (input.Projects != null && input.Projects.Any())
        {
            foreach (var projInput in input.Projects)
            {
                var project = projInput.Adapt<EventProject>();
                project.Id = _idGenerator.NewLong();
                project.EventId = eventInfo.Id;
                project.Status = AvailabilityStatus.Enable;
                project.CreatedTime = DateTime.Now;
                await _projectRepository.InsertAsync(project);

                if (projInput.Groups != null && projInput.Groups.Any())
                {
                    var groups = projInput.Groups.Select(g => 
                    {
                        var group = g.Adapt<EventProjectGroup>();
                        group.Id = _idGenerator.NewLong();
                        group.ProjectId = project.Id;
                        return group;
                    }).ToList();
                    await _projectGroupRepository.InsertRangeAsync(groups);
                }

                if (projInput.LimitCount.HasValue)
                {
                    var projLimit = new EventProjectRegistrationLimit
                    {
                        Id = _idGenerator.NewLong(),
                        EventId = eventInfo.Id,
                        ProjectId = project.Id,
                        LimitCount = projInput.LimitCount.Value
                    };
                    await _projectLimitRepository.InsertAsync(projLimit);
                }
            }
        }

        // 4. 更新报名限制
        await _registrationLimitRepository.DeleteAsync(x => x.EventId == input.Id);
        if (input.RegistrationLimit != null)
        {
            var limit = input.RegistrationLimit.Adapt<EventRegistrationLimit>();
            limit.Id = _idGenerator.NewLong();
            limit.EventId = eventInfo.Id;
            await _registrationLimitRepository.InsertAsync(limit);
        }

        // 5. 更新费用配置
        await _feeConfigRepository.DeleteAsync(x => x.EventId == input.Id);
        if (input.FeeConfig != null)
        {
            var feeConfig = input.FeeConfig.Adapt<EventFeeConfig>();
            feeConfig.Id = _idGenerator.NewLong();
            feeConfig.EventId = eventInfo.Id;
            await _feeConfigRepository.InsertAsync(feeConfig);
        }
    }

    /// <summary>
    /// 导出赛事
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    [DisplayName("导出赛事")]
    public async Task<byte[]> Export(EventExportInput input)
    {
        var query = _repository.AsQueryable()
            .LeftJoin<EventParticipant>((e, p) => e.Id == p.EventId)
            .LeftJoin<EventFeeConfig>((e, p, f) => e.Id == f.EventId)
            .LeftJoin<YD_Event.Core.Entities.Merchant>((e, p, f, m) => f.MerchantId == m.Id)
            .WhereIF(!string.IsNullOrWhiteSpace(input.EventName), e => e.EventName.Contains(input.EventName))
            .WhereIF(input.EventType.HasValue, e => e.EventType == input.EventType)
            .WhereIF(input.ChargeMode.HasValue, e => e.ChargeMode == input.ChargeMode)
            .WhereIF(input.EventStatus.HasValue, e => e.EventStatus == input.EventStatus)
            .WhereIF(input.RegistrationStartTime.HasValue, e => e.RegistrationStartTime >= input.RegistrationStartTime)
            .WhereIF(input.RegistrationEndTime.HasValue, e => e.RegistrationEndTime <= input.RegistrationEndTime)
            .WhereIF(input.MatchStartTime.HasValue, e => e.MatchStartTime >= input.MatchStartTime)
            .WhereIF(input.MatchEndTime.HasValue, e => e.MatchEndTime <= input.MatchEndTime)
            .Select((e, p, f, m) => new 
            {
                e.EventName,
                e.EventType,
                e.ChargeMode,
                e.RegistrationType,
                e.EventStatus,
                e.RegistrationStartTime,
                e.RegistrationEndTime,
                e.MaterialUploadEndTime,
                e.MatchStartTime,
                e.MatchEndTime,
                e.DetailAddress,
                p.HostName,
                p.OrganizerName,
                p.CoOrganizerName,
                p.SponsorName,
                MerchantName = m.MerchantName
            });

        var list = await query.ToListAsync();
        
        var exportData = new List<Dictionary<string, object>>();
        foreach (var item in list)
        {
            var row = new Dictionary<string, object>();
            var fields = input.ExportFields ?? new List<string>();
            bool all = fields.Count == 0;

            if (all || fields.Contains("赛事名称")) row["赛事名称"] = item.EventName;
            if (all || fields.Contains("赛事类型")) row["赛事类型"] = item.EventType.ToString(); // TODO: Enum Description
            if (all || fields.Contains("收费模式")) row["收费模式"] = item.ChargeMode.ToString();
            if (all || fields.Contains("收款商户")) row["收款商户"] = item.MerchantName;
            if (all || fields.Contains("报名方式")) row["报名方式"] = item.RegistrationType.ToString();
            if (all || fields.Contains("赛事状态")) row["赛事状态"] = item.EventStatus.ToString();
            if (all || fields.Contains("报名起止时间")) row["报名起止时间"] = $"{item.RegistrationStartTime:yyyy-MM-dd HH:mm} - {item.RegistrationEndTime:yyyy-MM-dd HH:mm}";
            if (all || fields.Contains("上传素材截至时间")) row["上传素材截至时间"] = item.MaterialUploadEndTime?.ToString("yyyy-MM-dd HH:mm");
            if (all || fields.Contains("比赛起止时间")) row["比赛起止时间"] = $"{item.MatchStartTime:yyyy-MM-dd HH:mm} - {item.MatchEndTime:yyyy-MM-dd HH:mm}";
            if (all || fields.Contains("赛事地址")) row["赛事地址"] = item.DetailAddress;
            if (all || fields.Contains("主办单位")) row["主办单位"] = item.HostName;
            if (all || fields.Contains("承办单位")) row["承办单位"] = item.OrganizerName;
            if (all || fields.Contains("协办单位")) row["协办单位"] = item.CoOrganizerName;
            if (all || fields.Contains("赞助单位")) row["赞助单位"] = item.SponsorName;
            
            exportData.Add(row);
        }

        using var stream = new MemoryStream();
        stream.SaveAs(exportData);
        return stream.ToArray();
    }

    /// <summary>
    /// 删除赛事
    /// </summary>
    /// <param name="dto"></param>
    /// <returns></returns>
    [DisplayName("删除赛事")]
    public override async Task Delete(KeyDto dto)
    {
        if (await _registrationRepository.IsAnyAsync(x => x.EventId == dto.Id))
        {
            throw new InvalidOperationException("已有人员报名此赛事，暂不支持删除");
        }

        // 软删除 EventInfo
        await base.Delete(dto);
        // 关联表物理删除或保留？通常保留。如果需要清理：
        // await _participantRepository.DeleteAsync(x => x.EventId == dto.Id);
        // await _customFieldRepository.DeleteAsync(x => x.EventId == dto.Id);
    }
}