using Microsoft.EntityFrameworkCore;
using SPMS.Domain.Entities;
using SPMS.Domain.Enums;
using SPMS.Domain.Interfaces;

namespace SPMS.Infrastructure.Persistence.Repositories;

public class PushSendLogRepository : Repository<PushSendLog>, IPushSendLogRepository
{
    public PushSendLogRepository(AppDbContext context) : base(context) { }

    public async Task<(IReadOnlyList<PushSendLog> Items, int TotalCount)> GetPagedWithMessageAsync(
        long serviceId, int page, int size,
        long? messageId = null, long? deviceId = null,
        PushResult? status = null,
        DateTime? startDate = null, DateTime? endDate = null)
    {
        var query = _dbSet
            .Include(l => l.Message)
            .Where(l => l.ServiceId == serviceId);

        if (messageId.HasValue)
            query = query.Where(l => l.MessageId == messageId.Value);

        if (deviceId.HasValue)
            query = query.Where(l => l.DeviceId == deviceId.Value);

        if (status.HasValue)
            query = query.Where(l => l.Status == status.Value);

        if (startDate.HasValue)
            query = query.Where(l => l.SentAt >= startDate.Value);

        if (endDate.HasValue)
            query = query.Where(l => l.SentAt < endDate.Value.AddDays(1));

        var totalCount = await query.CountAsync();

        var items = await query
            .OrderByDescending(l => l.SentAt)
            .Skip((page - 1) * size)
            .Take(size)
            .ToListAsync();

        return (items, totalCount);
    }

    public async Task<List<HourlyStatRaw>> GetHourlyStatsAsync(long? serviceId, DateTime startDate, DateTime endDate)
    {
        var query = _dbSet.Where(l => l.SentAt >= startDate && l.SentAt < endDate);
        if (serviceId.HasValue)
            query = query.Where(l => l.ServiceId == serviceId.Value);

        return await query
            .GroupBy(l => l.SentAt.Hour)
            .Select(g => new HourlyStatRaw
            {
                Hour = g.Key,
                SendCount = g.Count(),
                SuccessCount = g.Count(l => l.Status == PushResult.Success),
                FailCount = g.Count(l => l.Status == PushResult.Failed)
            })
            .OrderBy(h => h.Hour)
            .ToListAsync();
    }

    public async Task<MessageStatRaw?> GetMessageStatsAsync(long serviceId, long messageId, DateTime? startDate, DateTime? endDate)
    {
        var query = _dbSet.Where(l => l.ServiceId == serviceId && l.MessageId == messageId);

        if (startDate.HasValue)
            query = query.Where(l => l.SentAt >= startDate.Value);
        if (endDate.HasValue)
            query = query.Where(l => l.SentAt < endDate.Value.AddDays(1));

        var hasData = await query.AnyAsync();
        if (!hasData) return null;

        return await query
            .GroupBy(_ => 1)
            .Select(g => new MessageStatRaw
            {
                TotalSend = g.Count(),
                TotalSuccess = g.Count(l => l.Status == PushResult.Success),
                TotalFail = g.Count(l => l.Status == PushResult.Failed),
                FirstSentAt = g.Min(l => l.SentAt),
                LastSentAt = g.Max(l => l.SentAt)
            })
            .FirstOrDefaultAsync();
    }

    public async Task<(IReadOnlyList<PushSendLog> Items, int TotalCount)> GetDetailLogPagedAsync(
        long serviceId, long messageId, int page, int size,
        PushResult? status = null, Platform? platform = null)
    {
        var query = _dbSet
            .Include(l => l.Device)
            .Where(l => l.ServiceId == serviceId && l.MessageId == messageId);

        if (status.HasValue)
            query = query.Where(l => l.Status == status.Value);

        if (platform.HasValue)
            query = query.Where(l => l.Device.Platform == platform.Value);

        var totalCount = await query.CountAsync();

        var items = await query
            .OrderByDescending(l => l.SentAt)
            .Skip((page - 1) * size)
            .Take(size)
            .ToListAsync();

        return (items, totalCount);
    }

    public async Task<IReadOnlyList<PushSendLog>> GetExportLogsAsync(
        long serviceId, DateTime startDate, DateTime endDate,
        long? messageId = null, long? deviceId = null,
        PushResult? status = null, int maxCount = 100000)
    {
        var query = _dbSet
            .Include(l => l.Message)
            .Include(l => l.Device)
            .Where(l => l.ServiceId == serviceId && l.SentAt >= startDate && l.SentAt < endDate);

        if (messageId.HasValue)
            query = query.Where(l => l.MessageId == messageId.Value);

        if (deviceId.HasValue)
            query = query.Where(l => l.DeviceId == deviceId.Value);

        if (status.HasValue)
            query = query.Where(l => l.Status == status.Value);

        return await query
            .OrderByDescending(l => l.SentAt)
            .Take(maxCount)
            .ToListAsync();
    }

    public async Task<List<MessageDailyStatRaw>> GetMessageDailyStatsAsync(long serviceId, long messageId, DateTime? startDate, DateTime? endDate)
    {
        var query = _dbSet.Where(l => l.ServiceId == serviceId && l.MessageId == messageId);

        if (startDate.HasValue)
            query = query.Where(l => l.SentAt >= startDate.Value);
        if (endDate.HasValue)
            query = query.Where(l => l.SentAt < endDate.Value.AddDays(1));

        return await query
            .GroupBy(l => DateOnly.FromDateTime(l.SentAt))
            .Select(g => new MessageDailyStatRaw
            {
                StatDate = g.Key,
                SendCount = g.Count(),
                SuccessCount = g.Count(l => l.Status == PushResult.Success)
            })
            .OrderByDescending(d => d.StatDate)
            .ToListAsync();
    }

    public async Task<(IReadOnlyList<MessageHistorySummary> Items, int TotalCount)> GetMessageHistoryPagedAsync(
        long? serviceId, int page, int size,
        string? keyword = null, string? status = null,
        DateTime? startDate = null, DateTime? endDate = null)
    {
        var query = _dbSet
            .Include(l => l.Message)
            .Include(l => l.Message.Service)
            .Where(l => !l.Message.IsDeleted);

        if (serviceId.HasValue)
            query = query.Where(l => l.ServiceId == serviceId.Value);

        if (!string.IsNullOrWhiteSpace(keyword))
            query = query.Where(l => l.Message.MessageCode.Contains(keyword) || l.Message.Title.Contains(keyword));

        if (startDate.HasValue)
            query = query.Where(l => l.SentAt >= startDate.Value);

        if (endDate.HasValue)
            query = query.Where(l => l.SentAt < endDate.Value.AddDays(1));

        // 메시지별 GroupBy 집계
        var grouped = query
            .GroupBy(l => new { l.MessageId, l.Message.MessageCode, l.Message.Title, ServiceName = l.Message.Service.ServiceName })
            .Select(g => new MessageHistorySummary
            {
                MessageId = g.Key.MessageId,
                MessageCode = g.Key.MessageCode,
                Title = g.Key.Title,
                ServiceName = g.Key.ServiceName,
                FirstSentAt = g.Min(l => l.SentAt),
                TotalSendCount = g.Count(),
                SuccessCount = g.Count(l => l.Status == PushResult.Success),
                FailCount = g.Count(l => l.Status == PushResult.Failed)
            });

        // status 필터 (DB 레벨)
        if (!string.IsNullOrWhiteSpace(status))
        {
            grouped = status.ToLowerInvariant() switch
            {
                "complete" => grouped.Where(g => g.SuccessCount > 0),
                "failed" => grouped.Where(g => g.TotalSendCount > 0 && g.SuccessCount == 0),
                "pending" => grouped.Where(g => g.TotalSendCount == 0),
                _ => grouped
            };
        }

        var totalCount = await grouped.CountAsync();

        var items = await grouped
            .OrderByDescending(g => g.FirstSentAt)
            .Skip((page - 1) * size)
            .Take(size)
            .ToListAsync();

        return (items, totalCount);
    }

    public async Task<List<FailureStatRaw>> GetFailureStatsByMessageAsync(long serviceId, long messageId, int limit)
    {
        return await _dbSet
            .Where(l => l.ServiceId == serviceId && l.MessageId == messageId
                && l.Status == PushResult.Failed && l.FailReason != null)
            .GroupBy(l => l.FailReason!)
            .Select(g => new FailureStatRaw
            {
                FailReason = g.Key,
                Count = g.Count()
            })
            .OrderByDescending(f => f.Count)
            .Take(limit)
            .ToListAsync();
    }

    public async Task<List<FailureStatRaw>> GetFailureStatsAsync(long? serviceId, DateTime startDate, DateTime endDate, int limit)
    {
        var query = _dbSet.Where(l => l.Status == PushResult.Failed
            && l.SentAt >= startDate
            && l.SentAt < endDate
            && l.FailReason != null);
        if (serviceId.HasValue)
            query = query.Where(l => l.ServiceId == serviceId.Value);

        return await query
            .GroupBy(l => l.FailReason!)
            .Select(g => new FailureStatRaw
            {
                FailReason = g.Key,
                Count = g.Count()
            })
            .OrderByDescending(f => f.Count)
            .Take(limit)
            .ToListAsync();
    }
}