using YD_Event.Application.Arrangement.Dtos;
using YD_Event.Core.Entities;
using MiniExcelLibs;
using SqlSugar;

namespace YD_Event.Application.Arrangement;

/// <summary>
/// 赛事编排服务
/// </summary>
public class EventArrangementService : ITransient
{
    private readonly ISqlSugarRepository<EventProject> _projectRepository;
    private readonly ISqlSugarRepository<EventProjectGroup> _groupRepository;
    private readonly ISqlSugarRepository<EventRegistrationPerson> _personRepository;
    private readonly ISqlSugarRepository<EventRegistration> _registrationRepository;

    public EventArrangementService(
        ISqlSugarRepository<EventProject> projectRepository,
        ISqlSugarRepository<EventProjectGroup> groupRepository,
        ISqlSugarRepository<EventRegistrationPerson> personRepository,
        ISqlSugarRepository<EventRegistration> registrationRepository)
    {
        _projectRepository = projectRepository;
        _groupRepository = groupRepository;
        _personRepository = personRepository;
        _registrationRepository = registrationRepository;
    }

    /// <summary>
    /// 获取编排项目列表
    /// </summary>
    [DisplayName("获取编排项目列表")]
    public async Task<List<ArrangementProjectListOutput>> GetList(long eventId)
    {
        var projects = await _projectRepository.GetListAsync(x => x.EventId == eventId);
        projects = projects.OrderBy(x => x.SortIndex).ToList();
        
        var groups = await _groupRepository.GetListAsync(x => projects.Select(p => p.Id).Contains(x.ProjectId));
        
        // 统计各组别报名人数（仅统计已支付或审核通过的）
        var counts = await _personRepository.AsQueryable()
            .InnerJoin<EventRegistration>((p, r) => p.RegistrationId == r.Id)
            .Where((p, r) => r.EventId == eventId && (r.PaymentStatus == 1 || r.RegistrationStatus == 2))
            .GroupBy(p => new { p.ProjectId, p.GroupName })
            .Select(p => new { p.ProjectId, p.GroupName, Count = SqlFunc.AggregateCount(p.Id) })
            .ToListAsync();

        var result = new List<ArrangementProjectListOutput>();
        foreach (var proj in projects)
        {
            var dto = new ArrangementProjectListOutput
            {
                ProjectId = proj.Id,
                ProjectName = proj.ProjectName,
                ProjectType = $"{proj.ProjectMainType}-{proj.ProjectSubType}",
                DurationSeconds = proj.DurationSeconds,
                VenueCount = proj.VenueCount,
                SortIndex = proj.SortIndex,
                Groups = new List<ArrangementGroupDto>()
            };

            var projGroups = groups.Where(g => g.ProjectId == proj.Id).ToList();
            foreach (var group in projGroups)
            {
                var countObj = counts.FirstOrDefault(c => c.ProjectId == proj.Id && c.GroupName == group.GroupName);
                dto.Groups.Add(new ArrangementGroupDto 
                { 
                    GroupName = group.GroupName, 
                    ParticipantCount = countObj?.Count ?? 0 
                });
            }
            
            // 估算总时长
            int venueCount = proj.VenueCount > 0 ? proj.VenueCount : 1;
            int totalParticipants = dto.Groups.Sum(g => g.ParticipantCount);
            int rounds = (int)Math.Ceiling((double)totalParticipants / venueCount);
            dto.TotalDurationMinutes = (rounds * proj.DurationSeconds) / 60;

            result.Add(dto);
        }
        return result;
    }

    /// <summary>
    /// 更新编排设置
    /// </summary>
    [UnitOfWork]
    [DisplayName("更新编排设置")]
    public async Task Update(ArrangementUpdateInput input)
    {
        foreach (var setting in input.Settings)
        {
            await _projectRepository.UpdateAsync(x => new EventProject 
            { 
                VenueCount = setting.VenueCount, 
                SortIndex = setting.SortIndex 
            }, x => x.Id == setting.ProjectId);
        }
    }

    /// <summary>
    /// 编排预览
    /// </summary>
    [DisplayName("编排预览")]
    public async Task<List<ArrangementPreviewOutput>> Preview(long eventId)
    {
        // 1. 获取项目（按顺序）
        var projects = await _projectRepository.GetListAsync(x => x.EventId == eventId);
        projects = projects.OrderBy(x => x.SortIndex).ToList();

        var result = new List<ArrangementPreviewOutput>();
        
        // 2. 生成排期
        foreach (var proj in projects)
        {
            int venueCount = proj.VenueCount > 0 ? proj.VenueCount : 1;
            
            // 获取参赛人员（排序：组别 -> ID）
            var persons = await _personRepository.AsQueryable()
                .InnerJoin<EventRegistration>((p, r) => p.RegistrationId == r.Id)
                .Where((p, r) => p.ProjectId == proj.Id && (r.PaymentStatus == 1 || r.RegistrationStatus == 2))
                .OrderBy(p => p.GroupName)
                .OrderBy(p => p.Id)
                .Select((p, r) => new { 
                    p.Name, p.GroupName, r.TeamName, 
                    Duration = proj.DurationSeconds 
                })
                .ToListAsync();

            if (!persons.Any()) continue;

            // 分组逻辑
            int currentRound = 1;
            int currentVenue = 1;
            
            foreach (var person in persons)
            {
                result.Add(new ArrangementPreviewOutput
                {
                    TimeRange = $"{proj.DurationSeconds}''", 
                    ProjectName = proj.ProjectName,
                    GroupName = person.GroupName,
                    TeamName = person.TeamName,
                    AthleteName = person.Name,
                    SessionIndex = currentRound,
                    VenueIndex = currentVenue
                });

                currentVenue++;
                if (currentVenue > venueCount)
                {
                    currentVenue = 1;
                    currentRound++;
                }
            }
        }
        
        return result;
    }
    
    /// <summary>
    /// 导出编排
    /// </summary>
    [DisplayName("导出编排")]
    public async Task<byte[]> Export(long eventId)
    {
        var data = await Preview(eventId);
        using var stream = new MemoryStream();
        stream.SaveAs(data);
        return stream.ToArray();
    }
}