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

namespace Application.Features.Admin.Donation.List.Export;

public sealed class Handler(IAppDbContext db) : IQueryHandler<Query, Response>
{
    public async Task<Response> Handle(Query request, CancellationToken ct)
    {
        var query = db.Donation.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)),
                7 => query.Where(x => x.SendName.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);
        }

        var list = await query.OrderByDescending(x => x.ID).Select(x => new
        {
            x.ID,
            x.Amount,
            x.SendName,
            x.Message,
            x.CreatedAt,
            x.SponsorMemberID,
            x.ReceiverMemberID,
            SponsorEmail = x.Sponsor != null ? x.Sponsor.Email : string.Empty,
            SponsorName = x.Sponsor != null ? x.Sponsor.Name : null,
            SponsorID = x.Sponsor != null ? x.Sponsor.ID : 0,
            ReceiverEmail = x.Receiver != null ? x.Receiver.Email : string.Empty,
            ReceiverName = x.Receiver != null ? x.Receiver.Name : null,
            ReceiverID = x.Receiver != null ? x.Receiver.ID : 0
        }).ToListAsync(ct);

        var memberIDs = list.Select(x => x.SponsorMemberID).Concat(list.Select(x => x.ReceiverMemberID)).Distinct().ToArray();

        var wallets = await db.Wallet.AsNoTracking().Where(w => memberIDs.Contains(w.MemberID)).Include(w => w.Balances).ToListAsync(ct);

        var balanceByMember = wallets.ToDictionary(
            w => w.MemberID,
            w => new
            {
                Total = (long)w.Balances.Where(b => b.Type != WalletBalanceType.Locked).Sum(b => b.Amount.Value),
                Donation = (long)(w.Balances.FirstOrDefault(b => b.Type == WalletBalanceType.Donation)?.Amount.Value ?? 0)
            });

        var rows = list.Select(x =>
        {
            var sponsorBalance = balanceByMember.TryGetValue(x.SponsorMemberID, out var sb) ? sb.Total : 0L;
            var receiverBalance = balanceByMember.TryGetValue(x.ReceiverMemberID, out var rb) ? rb.Donation : 0L;

            return new Dictionary<string, object?>
            {
                ["ID"] = x.ID,
                ["후원금액"] = x.Amount,
                ["보낸이름"] = x.SendName,
                ["후원자"] = $"[{x.SponsorID}] {x.SponsorEmail}, {x.SponsorName ?? "-"}",
                ["후원자잔고"] = sponsorBalance,
                ["피후원자"] = $"[{x.ReceiverID}] {x.ReceiverEmail}, {x.ReceiverName ?? "-"}",
                ["피후원자잔고"] = receiverBalance,
                ["전달내용"] = x.Message ?? string.Empty,
                ["등록일시KST"] = x.CreatedAt.AddHours(9).ToString("yyyy-MM-dd HH:mm:ss")
            };
        }).ToList();

        return new Response
        {
            Rows = rows
        };
    }
}