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

namespace Application.Features.Admin.Developers.GlobalStats;

internal sealed class Handler(IAppDbContext db) : IQueryHandler<Query, Response>
{
    private const int DefaultDays = 7;
    private const int MaxDays = 90;

    public async Task<Response> Handle(Query request, CancellationToken ct)
    {
        var days = Math.Clamp(request.Days <= 0 ? DefaultDays : request.Days, 1, MaxDays);
        var since = DateTime.UtcNow.AddDays(-days);

        var totalApps = await db.ApiApplication.CountAsync(ct);
        var activeApps = await db.ApiApplication.CountAsync(c => c.Status == ApplicationStatus.Active, ct);
        var pendingApps = await db.ApiApplication.CountAsync(c => c.Status == ApplicationStatus.Pending, ct);
        var totalPats = await db.ApiPersonalAccessToken.CountAsync(ct);
        var activePats = await db.ApiPersonalAccessToken.CountAsync(c => c.RevokedAt == null, ct);

        var daily = await db.ApiRequestLog
            .Where(c => c.RequestedAt >= since)
            .GroupBy(c => DateOnly.FromDateTime(c.RequestedAt))
            .Select(g => new DailyStat(
                g.Key,
                g.Count(),
                g.Count(c => c.StatusCode >= 400)
            ))
            .OrderBy(c => c.Date)
            .ToListAsync(ct);

        return new Response(totalApps, activeApps, pendingApps, totalPats, activePats, daily);
    }
}