using YD_Event.Application.Client.Dtos;
using YD_Event.Application.Event;

namespace YD_Event.Application.Client;

/// <summary>从秩序册实时生成检录项目、组别和列对象。</summary>
public class CheckinScheduleService : ITransient
{
    private readonly ISqlSugarRepository<EventInfo> _eventRepository;
    private readonly ISqlSugarRepository<EventRegistrationPerson> _personRepository;
    private readonly ISqlSugarRepository<EventRegistration> _registrationRepository;
    private readonly ISqlSugarRepository<EventSession> _sessionRepository;
    private readonly ISqlSugarRepository<EventSessionEntry> _entryRepository;
    private readonly ISqlSugarRepository<EventProject> _eventProjectRepository;
    private readonly ISqlSugarRepository<YD_Event.Core.Entities.Project> _projectRepository;
    private readonly ISqlSugarRepository<EventVenue> _venueRepository;
    private readonly EventArrangementService _arrangementService;

    public CheckinScheduleService(
        ISqlSugarRepository<EventInfo> eventRepository,
        ISqlSugarRepository<EventRegistrationPerson> personRepository,
        ISqlSugarRepository<EventRegistration> registrationRepository,
        ISqlSugarRepository<EventSession> sessionRepository,
        ISqlSugarRepository<EventSessionEntry> entryRepository,
        ISqlSugarRepository<EventProject> eventProjectRepository,
        ISqlSugarRepository<YD_Event.Core.Entities.Project> projectRepository,
        ISqlSugarRepository<EventVenue> venueRepository,
        EventArrangementService arrangementService)
    {
        _eventRepository = eventRepository;
        _personRepository = personRepository;
        _registrationRepository = registrationRepository;
        _sessionRepository = sessionRepository;
        _entryRepository = entryRepository;
        _eventProjectRepository = eventProjectRepository;
        _projectRepository = projectRepository;
        _venueRepository = venueRepository;
        _arrangementService = arrangementService;
    }

    public async Task<CheckinEventOptionsDto> GetOptionsAsync(long eventId)
    {
        var evt = await _eventRepository.GetFirstAsync(x =>
            x.Id == eventId && !x.DeleteMark && x.Status == AvailabilityStatus.Enable);
        if (evt == null) throw Oops.Bah("赛事不存在或已停用");

        // 秩序册确认导入后已经固化了场次和出场顺序，检录直接沿用该顺序，
        // 不再要求报名平台存在报名人员或重复执行赛事编排。
        var importedOptions = await BuildImportedOptionsAsync(evt);
        if (importedOptions != null) return importedOptions;

        // Preview 的每一行就是秩序册中的一列：个人项目一人，团队项目可以多人。
        var rows = await _arrangementService.Preview(eventId);
        if (rows.Count == 0) throw Oops.Bah("当前赛事尚未生成有效秩序册，不能创建检录任务");

        var personIds = rows.SelectMany(x => x.RegistrationPersonIds).Distinct().ToList();
        var persons = personIds.Count == 0
            ? new List<EventRegistrationPerson>()
            : await _personRepository.AsQueryable()
                .Where(x => personIds.Contains(x.Id) && !x.DeleteMark && x.PersonType == PersonType.Athlete)
                .ToListAsync();
        var personMap = persons.ToDictionary(x => x.Id);
        var registrationIds = persons.Select(x => x.RegistrationId).Distinct().ToList();
        var registrationModes = registrationIds.Count == 0
            ? new Dictionary<long, int>()
            : (await _registrationRepository.AsQueryable()
                .Where(x => registrationIds.Contains(x.Id) && !x.DeleteMark)
                .ToListAsync())
                .ToDictionary(x => x.Id, x => x.RegistrationMode);

        // 团队项目沿用报名项目作为检录单位；个人项目追加报名人员 ID，
        // 避免单位账号在同一报名项目下填报多人时共用同一个检录键。
        var units = rows.Select((row, index) => new CheckinOrderBookUnitDto
        {
            UnitKey = BuildUnitKey(row.EventProjectId, row.RegistrationItemId,
                row.IsTeamProject ? null : row.RegistrationPersonIds.SingleOrDefault()),
            IsTeamProject = row.IsTeamProject,
            Order = index + 1,
            SessionIndex = row.SessionIndex,
            VenueIndex = row.VenueIndex,
            VenueName = $"{row.VenueIndex}号场地",
            EventProjectId = row.EventProjectId,
            ProjectId = row.ProjectId,
            ProjectName = row.ProjectName,
            GroupId = row.EventProjectGroupId,
            GroupName = row.GroupName,
            RegistrationItemId = row.RegistrationItemId,
            RegistrationMode = row.RegistrationPersonIds
                .Where(personMap.ContainsKey)
                .Select(personId => registrationModes.GetValueOrDefault(personMap[personId].RegistrationId))
                .FirstOrDefault(mode => mode > 0) is var mode && mode > 0 ? mode : null,
            TeamName = row.TeamName ?? string.Empty,
            UnitName = row.UnitName ?? string.Empty,
            RegistrationPersonIds = row.RegistrationPersonIds.Distinct().ToList(),
            Athletes = row.RegistrationPersonIds.Distinct()
                .Where(personMap.ContainsKey)
                .Select(personId =>
                {
                    var person = personMap[personId];
                    return new CheckinAthleteDto
                    {
                        Id = person.Id,
                        UserId = person.UserId,
                        BibNo = FormatBibNo(person.Id),
                        Name = person.Name,
                        TeamName = row.TeamName ?? string.Empty
                    };
                }).ToList()
        }).ToList();

        var projects = units.GroupBy(x => new { x.EventProjectId, x.ProjectId, x.ProjectName })
            .Select((project, projectIndex) => new CheckinProjectOptionDto
            {
                EventProjectId = project.Key.EventProjectId,
                ProjectId = project.Key.ProjectId,
                ProjectName = project.Key.ProjectName,
                Order = projectIndex + 1,
                Groups = project.Where(x => x.GroupId.HasValue)
                    .GroupBy(x => new { Id = x.GroupId!.Value, x.GroupName })
                    .Select((group, groupIndex) => new CheckinGroupOptionDto
                    {
                        Id = group.Key.Id,
                        EventProjectId = project.Key.EventProjectId,
                        ProjectId = project.Key.ProjectId,
                        ProjectName = project.Key.ProjectName,
                        GroupName = group.Key.GroupName,
                        Order = groupIndex + 1
                    }).ToList()
            }).ToList();

        return new CheckinEventOptionsDto
        {
            EventId = evt.Id,
            EventName = evt.EventName,
            Projects = projects,
            Units = units,
            // 兼容旧调用方：Sessions 不再是检录对象。
            Sessions = new List<CheckinSessionOptionDto>(),
            Rounds = new List<CheckinRoundOptionDto>()
        };
    }

    private async Task<CheckinEventOptionsDto?> BuildImportedOptionsAsync(EventInfo evt)
    {
        var sessions = await _sessionRepository.AsQueryable()
            .Where(x => x.EventId == evt.Id && !x.DeleteMark && x.Status == AvailabilityStatus.Enable)
            .ToListAsync();
        if (sessions.Count == 0) return null;

        var sessionIds = sessions.Select(x => x.Id).ToList();
        var entries = await _entryRepository.AsQueryable()
            .Where(x => sessionIds.Contains(x.SessionId) && x.SourceType == 1 &&
                        !x.DeleteMark && x.Status == AvailabilityStatus.Enable)
            .ToListAsync();
        if (entries.Count == 0) return null;

        var eventProjectIds = sessions.Select(x => x.EventProjectId).Distinct().ToList();
        var eventProjects = await _eventProjectRepository.AsQueryable()
            .Where(x => eventProjectIds.Contains(x.Id) && !x.DeleteMark)
            .ToListAsync();
        var projectIds = eventProjects.Select(x => x.ProjectId).Distinct().ToList();
        var projects = await _projectRepository.AsQueryable()
            .Where(x => projectIds.Contains(x.Id) && !x.DeleteMark)
            .ToListAsync();
        var venueIds = sessions.Select(x => x.VenueId).Distinct().ToList();
        var venues = await _venueRepository.AsQueryable()
            .Where(x => venueIds.Contains(x.Id) && !x.DeleteMark)
            .ToListAsync();

        var eventProjectMap = eventProjects.ToDictionary(x => x.Id);
        var projectMap = projects.ToDictionary(x => x.Id);
        var venueMap = venues.ToDictionary(x => x.Id);
        var sessionOrderMap = sessions.ToDictionary(
            x => x.Id,
            x => GetImportedSessionOrder(x.SessionName, GetSessionOrder(x.SessionNo)));
        var sessionMap = sessions.ToDictionary(x => x.Id);

        // 秩序册允许不同比赛日重复从“第1场”开始，不能再按场次数字排序。
        // 导入时出场记录 ID 按 Excel 行顺序生成，因此按 ID 即为原始导入顺序。
        var units = entries
            .Where(x => sessionMap.ContainsKey(x.SessionId))
            .OrderBy(x => x.Id)
            .Select((entry, index) =>
            {
                var session = sessionMap[entry.SessionId];
                eventProjectMap.TryGetValue(session.EventProjectId, out var eventProject);
                var project = eventProject == null ? null : projectMap.GetValueOrDefault(eventProject.ProjectId);
                venueMap.TryGetValue(session.VenueId, out var venue);
                return new CheckinOrderBookUnitDto
                {
                    UnitKey = $"SE{entry.Id}",
                    IsTeamProject = !string.IsNullOrWhiteSpace(entry.TeamName),
                    Order = index + 1,
                    SessionIndex = sessionOrderMap[session.Id],
                    VenueIndex = venue?.Sort ?? 0,
                    VenueName = venue?.VenueName ?? string.Empty,
                    EventProjectId = session.EventProjectId,
                    ProjectId = eventProject?.ProjectId ?? 0,
                    ProjectName = project?.Name ?? string.Empty,
                    GroupId = session.EventProjectGroupId,
                    GroupName = entry.GroupName,
                    RegistrationItemId = 0,
                    TeamName = entry.TeamName ?? string.Empty,
                    UnitName = string.Empty,
                    RegistrationPersonIds = new List<long>(),
                    Athletes = new List<CheckinAthleteDto>
                    {
                        new()
                        {
                            Id = entry.Id,
                            BibNo = entry.EntryNo,
                            Name = entry.ParticipantName,
                            TeamName = entry.TeamName ?? string.Empty,
                            OrderBookSessionName = session.SessionName ?? string.Empty
                        }
                    }
                };
            }).ToList();

        var projectOptions = units
            .GroupBy(x => new { x.EventProjectId, x.ProjectId, x.ProjectName })
            .Select((project, projectIndex) => new CheckinProjectOptionDto
            {
                EventProjectId = project.Key.EventProjectId,
                ProjectId = project.Key.ProjectId,
                ProjectName = project.Key.ProjectName,
                Order = projectIndex + 1,
                Groups = project.Where(x => x.GroupId.HasValue)
                    .GroupBy(x => new { Id = x.GroupId!.Value, x.GroupName })
                    .Select((group, groupIndex) => new CheckinGroupOptionDto
                    {
                        Id = group.Key.Id,
                        EventProjectId = project.Key.EventProjectId,
                        ProjectId = project.Key.ProjectId,
                        ProjectName = project.Key.ProjectName,
                        GroupName = group.Key.GroupName,
                        Order = groupIndex + 1
                    }).ToList()
            }).ToList();

        return new CheckinEventOptionsDto
        {
            EventId = evt.Id,
            EventName = evt.EventName,
            Projects = projectOptions,
            Units = units,
            Sessions = new List<CheckinSessionOptionDto>(),
            Rounds = new List<CheckinRoundOptionDto>()
        };
    }

    private static int GetSessionOrder(string? sessionNo)
    {
        if (string.IsNullOrWhiteSpace(sessionNo)) return int.MaxValue;
        var segment = sessionNo.Split('-').LastOrDefault();
        return int.TryParse(segment, out var value) ? value : int.MaxValue;
    }

    private static int GetImportedSessionOrder(string? sessionName, int fallback)
    {
        if (string.IsNullOrWhiteSpace(sessionName)) return fallback;
        var normalized = sessionName.Trim();
        if (normalized.StartsWith('第') && normalized.EndsWith('场'))
            normalized = normalized[1..^1].Trim();
        return int.TryParse(normalized, out var value) && value > 0 ? value : fallback;
    }

    public static CheckinOrderBookUnitDto ResolveUnit(CheckinEventOptionsDto options, string unitKey)
    {
        var unit = options.Units.FirstOrDefault(x => x.UnitKey == unitKey);
        return unit ?? throw Oops.Bah("所选检录对象不属于当前赛事秩序册");
    }

    /// <summary>
    /// 生成检录对象唯一键。团队项目不传人员 ID，个人项目必须传入人员 ID。
    /// </summary>
    public static string BuildUnitKey(
        long eventProjectId, long registrationItemId, long? registrationPersonId = null)
    {
        var key = $"EP{eventProjectId}-RI{registrationItemId}";
        return registrationPersonId.HasValue && registrationPersonId.Value > 0
            ? $"{key}-RP{registrationPersonId.Value}"
            : key;
    }

    private static string FormatBibNo(long personId)
    {
        var value = personId.ToString();
        return value.Length > 6 ? value[^6..] : value.PadLeft(6, '0');
    }
}