<?php

namespace App\Services\Stats;

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

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

        // 재고 현황 (stocks 테이블 - 현재 스냅샷)
        $stockSummary = DB::connection('mysql')
            ->table('stocks')
            ->where('tenant_id', $tenantId)
            ->whereNull('deleted_at')
            ->selectRaw('
                COUNT(*) as sku_count,
                COALESCE(SUM(stock_qty), 0) as total_qty,
                SUM(CASE WHEN stock_qty < safety_stock AND safety_stock > 0 THEN 1 ELSE 0 END) as below_safety,
                SUM(CASE WHEN stock_qty = 0 THEN 1 ELSE 0 END) as zero_stock,
                SUM(CASE WHEN stock_qty > safety_stock * 3 AND safety_stock > 0 THEN 1 ELSE 0 END) as excess_stock
            ')
            ->first();

        // 입고 (stock_transactions type = 'receipt')
        $receiptStats = DB::connection('mysql')
            ->table('stock_transactions')
            ->where('tenant_id', $tenantId)
            ->whereDate('created_at', $dateStr)
            ->where('type', 'receipt')
            ->selectRaw('COUNT(*) as cnt, COALESCE(SUM(qty), 0) as total_qty')
            ->first();

        // 출고 (stock_transactions type = 'issue')
        $issueStats = DB::connection('mysql')
            ->table('stock_transactions')
            ->where('tenant_id', $tenantId)
            ->whereDate('created_at', $dateStr)
            ->where('type', 'issue')
            ->selectRaw('COUNT(*) as cnt, COALESCE(SUM(ABS(qty)), 0) as total_qty')
            ->first();

        // 품질검사 (inspections)
        $inspectionStats = DB::connection('mysql')
            ->table('inspections')
            ->where('tenant_id', $tenantId)
            ->where('inspection_date', $dateStr)
            ->whereNull('deleted_at')
            ->selectRaw("
                COUNT(*) as cnt,
                SUM(CASE WHEN result = 'pass' THEN 1 ELSE 0 END) as pass_count,
                SUM(CASE WHEN result = 'fail' THEN 1 ELSE 0 END) as fail_count
            ")
            ->first();

        $inspectionCount = $inspectionStats->cnt ?? 0;
        $passCount = $inspectionStats->pass_count ?? 0;
        $failCount = $inspectionStats->fail_count ?? 0;
        $passRate = $inspectionCount > 0 ? ($passCount / $inspectionCount) * 100 : 0;

        StatInventoryDaily::updateOrCreate(
            ['tenant_id' => $tenantId, 'stat_date' => $dateStr],
            [
                'total_sku_count' => $stockSummary->sku_count ?? 0,
                'total_stock_qty' => $stockSummary->total_qty ?? 0,
                'total_stock_value' => 0, // 단가 정보 없어 Phase 4에서 보완
                'receipt_count' => $receiptStats->cnt ?? 0,
                'receipt_qty' => $receiptStats->total_qty ?? 0,
                'receipt_amount' => 0,
                'issue_count' => $issueStats->cnt ?? 0,
                'issue_qty' => $issueStats->total_qty ?? 0,
                'issue_amount' => 0,
                'below_safety_count' => $stockSummary->below_safety ?? 0,
                'zero_stock_count' => $stockSummary->zero_stock ?? 0,
                'excess_stock_count' => $stockSummary->excess_stock ?? 0,
                'inspection_count' => $inspectionCount,
                'inspection_pass_count' => $passCount,
                'inspection_fail_count' => $failCount,
                'inspection_pass_rate' => $passRate,
                'turnover_rate' => 0, // 월간 집계에서 계산
            ]
        );

        return 1;
    }

    public function aggregateMonthly(int $tenantId, int $year, int $month): int
    {
        // 재고 도메인은 일간 스냅샷 기반이므로 별도 월간 테이블 없음
        // 필요시 Phase 4에서 stat_inventory_monthly 추가
        return 0;
    }
}