<?php

namespace App\Services\Stats;

use App\Models\Stats\Daily\StatHrAttendanceDaily;
use Carbon\Carbon;
use Illuminate\Support\Facades\DB;

class HrStatService implements StatDomainServiceInterface
{
    public function aggregateDaily(int $tenantId, Carbon $date): int
    {
        $dateStr = $date->format('Y-m-d');

        // 전체 직원 수 (tenant_user_profiles 기준)
        $totalEmployees = DB::connection('mysql')
            ->table('user_tenants')
            ->where('tenant_id', $tenantId)
            ->where('is_active', true)
            ->count();

        // 근태 (attendances)
        $attendanceStats = DB::connection('mysql')
            ->table('attendances')
            ->where('tenant_id', $tenantId)
            ->where('base_date', $dateStr)
            ->whereNull('deleted_at')
            ->selectRaw("
                COUNT(*) as total_count,
                SUM(CASE WHEN status = 'onTime' THEN 1 ELSE 0 END) as on_time_count,
                SUM(CASE WHEN status = 'late' THEN 1 ELSE 0 END) as late_count,
                SUM(CASE WHEN status = 'absent' THEN 1 ELSE 0 END) as absent_count,
                SUM(CASE WHEN status = 'overtime' THEN 1 ELSE 0 END) as overtime_count
            ")
            ->first();

        $attendanceCount = ($attendanceStats->on_time_count ?? 0)
            + ($attendanceStats->late_count ?? 0)
            + ($attendanceStats->overtime_count ?? 0);
        $attendanceRate = $totalEmployees > 0 ? ($attendanceCount / $totalEmployees) * 100 : 0;

        // 휴가 (leaves)
        $leaveStats = DB::connection('mysql')
            ->table('leaves')
            ->where('tenant_id', $tenantId)
            ->where('start_date', '<=', $dateStr)
            ->where('end_date', '>=', $dateStr)
            ->where('status', 'approved')
            ->whereNull('deleted_at')
            ->selectRaw("
                COUNT(*) as total_count,
                SUM(CASE WHEN leave_type = 'annual' THEN 1 ELSE 0 END) as annual_count,
                SUM(CASE WHEN leave_type = 'sick' THEN 1 ELSE 0 END) as sick_count,
                SUM(CASE WHEN leave_type NOT IN ('annual', 'sick') THEN 1 ELSE 0 END) as other_count
            ")
            ->first();

        // 초과근무 (attendances status = 'overtime')
        $overtimeCount = $attendanceStats->overtime_count ?? 0;

        StatHrAttendanceDaily::updateOrCreate(
            ['tenant_id' => $tenantId, 'stat_date' => $dateStr],
            [
                'total_employees' => $totalEmployees,
                'attendance_count' => $attendanceCount,
                'late_count' => $attendanceStats->late_count ?? 0,
                'absent_count' => $attendanceStats->absent_count ?? 0,
                'attendance_rate' => $attendanceRate,
                'leave_count' => $leaveStats->total_count ?? 0,
                'leave_annual_count' => $leaveStats->annual_count ?? 0,
                'leave_sick_count' => $leaveStats->sick_count ?? 0,
                'leave_other_count' => $leaveStats->other_count ?? 0,
                'overtime_hours' => 0, // attendances에 시간 정보 없음
                'overtime_employee_count' => $overtimeCount,
                'total_labor_cost' => 0, // 일간 인건비는 급여 정산 시 계산
            ]
        );

        return 1;
    }

    public function aggregateMonthly(int $tenantId, int $year, int $month): int
    {
        // 인사 도메인은 일간 테이블만 운영 (월간은 Phase 4에서 필요시 추가)
        return 0;
    }
}