<?php

namespace App\Services\Audit;

use App\Models\Audit\TriggerAuditLog;
use App\Services\Service;
use Illuminate\Contracts\Pagination\LengthAwarePaginator;

class TriggerAuditLogService extends Service
{
    public function paginate(array $filters): LengthAwarePaginator
    {
        $page = (int) ($filters['page'] ?? 1);
        $size = (int) ($filters['size'] ?? 20);
        $sort = $filters['sort'] ?? 'created_at';
        $order = $filters['order'] ?? 'desc';

        $q = TriggerAuditLog::query();

        // 테넌트 필터 (선택적: 전체 조회도 가능)
        if (! empty($filters['tenant_id'])) {
            $q->where('tenant_id', (int) $filters['tenant_id']);
        }
        if (! empty($filters['table_name'])) {
            $q->where('table_name', $filters['table_name']);
        }
        if (! empty($filters['row_id'])) {
            $q->where('row_id', $filters['row_id']);
        }
        if (! empty($filters['dml_type'])) {
            $q->where('dml_type', $filters['dml_type']);
        }
        if (! empty($filters['actor_id'])) {
            $q->where('actor_id', (int) $filters['actor_id']);
        }
        if (! empty($filters['db_user'])) {
            $q->where('db_user', 'like', "%{$filters['db_user']}%");
        }
        if (! empty($filters['from'])) {
            $q->where('created_at', '>=', $filters['from']);
        }
        if (! empty($filters['to'])) {
            $q->where('created_at', '<=', $filters['to']);
        }

        return $q->orderBy($sort, $order)->paginate($size, ['*'], 'page', $page);
    }

    /**
     * 특정 레코드의 변경 이력 조회
     */
    public function recordHistory(string $tableName, string $rowId): \Illuminate\Support\Collection
    {
        return TriggerAuditLog::forRecord($tableName, $rowId)
            ->orderByDesc('created_at')
            ->get();
    }

    /**
     * 테이블별 변경 통계
     */
    public function stats(?int $tenantId = null): array
    {
        $q = TriggerAuditLog::query();

        if ($tenantId) {
            $q->where('tenant_id', $tenantId);
        }

        $total = (clone $q)->count();

        $byDmlType = (clone $q)
            ->selectRaw('dml_type, COUNT(*) as count')
            ->groupBy('dml_type')
            ->pluck('count', 'dml_type')
            ->toArray();

        $topTables = (clone $q)
            ->selectRaw('table_name, COUNT(*) as count')
            ->groupBy('table_name')
            ->orderByDesc('count')
            ->limit(10)
            ->pluck('count', 'table_name')
            ->toArray();

        $today = (clone $q)
            ->whereDate('created_at', today())
            ->count();

        return [
            'total' => $total,
            'today' => $today,
            'by_dml_type' => $byDmlType,
            'top_tables' => $topTables,
        ];
    }
}