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

namespace Application.Features.Admin.Developers.Purchases.Search;

internal sealed class Handler(IAppDbContext db) : IQueryHandler<Query, Response>
{
    public async Task<Response> Handle(Query request, CancellationToken ct)
    {
        var page = Math.Max(1, request.PageNum);
        var size = Math.Clamp(request.PerPage, 1, 100);

        var query = db.ApiPurchase.AsNoTracking().AsQueryable();

        if (request.Status.HasValue)
        {
            query = query.Where(c => c.Status == request.Status.Value);
        }

        if (!string.IsNullOrWhiteSpace(request.Keyword))
        {
            var keyword = request.Keyword.Trim();
            var upper = keyword.ToUpperInvariant();
            query = query.Where(c => c.OrderID == keyword || c.Channel!.DonationCode == upper || c.Game!.Code == keyword || c.Channel!.Name.Contains(keyword));
        }

        if (request.From.HasValue)
        {
            query = query.Where(c => c.CreatedAt >= request.From.Value);
        }

        if (request.To.HasValue)
        {
            var to = request.To.Value.Date.AddDays(1);
            query = query.Where(c => c.CreatedAt < to);
        }

        if (request.OnlyMismatch)
        {
            query = query.Where(c => c.PriceMismatched);
        }

        var total = await query.CountAsync(ct);

        // 집계 (검색 조건 범위) — 이상 패턴 검토용
        var summaryRaw = await query
            .GroupBy(c => 1)
            .Select(g => new
            {
                TotalOrderPrice = g.Sum(c => (long)c.OrderPrice),
                TotalCommission = g.Sum(c => (long)c.CommissionAmount),
                PendingCount = g.Count(c => c.Status == ApiPurchaseStatus.Pending),
                ConfirmedCount = g.Count(c => c.Status == ApiPurchaseStatus.Confirmed),
                CanceledCount = g.Count(c => c.Status == ApiPurchaseStatus.Canceled),
                MismatchCount = g.Count(c => c.PriceMismatched)
            })
            .FirstOrDefaultAsync(ct);

        var totalShortfall = await db.ApiPurchaseCancel.AsNoTracking()
            .Where(x => query.Any(c => c.ID == x.PurchaseID))
            .SumAsync(x => (long?)x.ShortfallAmount, ct) ?? 0;

        var summary = new Response.SummaryData(
            summaryRaw?.TotalOrderPrice ?? 0,
            summaryRaw?.TotalCommission ?? 0,
            summaryRaw?.PendingCount ?? 0,
            summaryRaw?.ConfirmedCount ?? 0,
            summaryRaw?.CanceledCount ?? 0,
            summaryRaw?.MismatchCount ?? 0,
            totalShortfall
        );

        var list = await query
            .OrderByDescending(c => c.ID)
            .Skip((page - 1) * size)
            .Take(size)
            .Select(c => new Response.Row(
                c.ID,
                c.Application!.Name,
                c.Channel!.Name,
                c.Channel!.DonationCode,
                c.Game!.KorName,
                c.OrderID,
                c.Marketplace,
                c.ProductID,
                c.OrderPrice,
                c.CommissionRate,
                c.CommissionAmount,
                c.CatalogPrice,
                c.PriceMismatched,
                c.Status,
                c.ConfirmDueAt,
                c.ConfirmedAt,
                c.CanceledAt,
                c.CreatedAt,
                db.ApiPurchaseCancel.Where(x => x.PurchaseID == c.ID).Select(x => (bool?)x.WasConfirmed).FirstOrDefault(),
                db.ApiPurchaseCancel.Where(x => x.PurchaseID == c.ID).Select(x => (int?)x.RecoveredAmount).FirstOrDefault(),
                db.ApiPurchaseCancel.Where(x => x.PurchaseID == c.ID).Select(x => (int?)x.ShortfallAmount).FirstOrDefault()
            ))
            .ToListAsync(ct);

        return new Response(total, summary, list);
    }
}