using Application.Abstractions.Data;
using Application.Abstractions.Messaging;
using Domain.Entities.Donations.ValueObject;
using Microsoft.EntityFrameworkCore;

namespace Application.Features.Admin.Donation.Alert.Search;

public sealed class Handler(IAppDbContext db) : IQueryHandler<Query, Response>
{
    public async Task<Response> Handle(Query request, CancellationToken ct)
    {
        var query = db.DonationAlert.AsNoTracking().Include(x => x.Sponsor).Include(x => x.Receiver).AsQueryable();

        if (!string.IsNullOrWhiteSpace(request.Keyword))
        {
            query = request.Search switch
            {
                1 => query.Where(x => x.Sponsor != null && x.Sponsor.ID.ToString().Contains(request.Keyword)),
                2 => query.Where(x => x.Sponsor != null && x.Sponsor.SID.Contains(request.Keyword)),
                3 => query.Where(x => x.Sponsor != null && x.Sponsor.Name != null && x.Sponsor.Name.Contains(request.Keyword)),
                4 => query.Where(x => x.Receiver != null && x.Receiver.ID.ToString().Contains(request.Keyword)),
                5 => query.Where(x => x.Receiver != null && x.Receiver.SID.Contains(request.Keyword)),
                6 => query.Where(x => x.Receiver != null && x.Receiver.Name != null && x.Receiver.Name.Contains(request.Keyword)),
                _ => query
            };
        }

        if (!string.IsNullOrWhiteSpace(request.StartAt) && DateTime.TryParse(request.StartAt, out var startAt))
        {
            query = query.Where(x => x.CreatedAt >= startAt);
        }

        if (!string.IsNullOrWhiteSpace(request.EndAt) && DateTime.TryParse(request.EndAt, out var endAt))
        {
            query = query.Where(x => x.CreatedAt <= endAt);
        }

        // 탭별 건수 집계 (탭 필터 적용 전)
        var counts = await query.GroupBy(c => 1).Select(c => new
        {
            Received = c.Count(x => x.Status == AlertStatus.Delivered),
            NotReceived = c.Count(x => x.Status != AlertStatus.Delivered)
        }).FirstOrDefaultAsync(ct);

        var received = counts?.Received ?? 0;
        var notReceived = counts?.NotReceived ?? 0;

        query = request.Tab switch
        {
            1 => query.Where(x => x.Status == AlertStatus.Delivered),
            2 => query.Where(x => x.Status != AlertStatus.Delivered),
            _ => query
        };

        var total = await query.CountAsync(ct);
        var skip = (request.Page - 1) * request.PerPage;

        var list = await query
            .OrderByDescending(x => x.ID)
            .Skip(skip)
            .Take(request.PerPage)
            .Select(x => new
            {
                x.ID,
                x.DonationID,
                x.Status,
                x.StartAt,
                x.ArrivedAt,
                x.IpAddress,
                x.CreatedAt,
                SponsorID = x.Sponsor != null ? x.Sponsor.ID : 0,
                SponsorEmail = x.Sponsor != null ? x.Sponsor.Email : string.Empty,
                SponsorName = x.Sponsor != null ? x.Sponsor.Name : null,
                ReceiverID = x.Receiver != null ? x.Receiver.ID : 0,
                ReceiverEmail = x.Receiver != null ? x.Receiver.Email : string.Empty,
                ReceiverName = x.Receiver != null ? x.Receiver.Name : null
            })
            .ToListAsync(ct);

        var rows = list.Select((x, idx) => new Response.Row
        {
            Num = total - skip - idx,
            ID = x.ID,
            DonationID = x.DonationID,
            Sponsor = new Response.MemberInfo
            {
                ID = x.SponsorID,
                Email = x.SponsorEmail,
                Name = x.SponsorName
            },
            Receiver = new Response.MemberInfo
            {
                ID = x.ReceiverID,
                Email = x.ReceiverEmail,
                Name = x.ReceiverName
            },
            Status = x.Status.ToString(),
            IsReceived = x.Status == AlertStatus.Delivered,
            StartAt = x.StartAt,
            ArrivedAt = x.ArrivedAt,
            IpAddress = x.IpAddress,
            CreatedAt = x.CreatedAt
        }).ToList();

        return new Response
        {
            Total = total,
            Received = received,
            NotReceived = notReceived,
            List = rows
        };
    }
}