<?php

namespace App\Http\Controllers\Api\Admin;

use App\Http\Controllers\Controller;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class SourceTableSearchController extends Controller
{
    /**
     * 소스 테이블별 검색 설정
     * model: Eloquent 모델 클래스 (없으면 DB 쿼리빌더 사용)
     * search_columns: 검색 대상 컬럼
     * select: 반환할 컬럼
     * title_field: 표시 제목 필드
     * subtitle_field: 표시 부제목 필드
     * has_tenant: tenant_id 필터 여부
     * has_active: is_active 필터 여부
     */
    private function getTableConfig(): array
    {
        return [
            'items' => [
                'model' => \App\Models\Items\Item::class,
                'search_columns' => ['name', 'code'],
                'select' => ['id', 'code', 'name', 'item_type', 'unit'],
                'title_field' => 'name',
                'subtitle_field' => 'code',
                'has_tenant' => true,
                'has_active' => true,
                'order_by' => 'name',
            ],
            'processes' => [
                'model' => \App\Models\Process::class,
                'search_columns' => ['process_name', 'process_code'],
                'select' => ['id', 'process_code', 'process_name'],
                'title_field' => 'process_name',
                'subtitle_field' => 'process_code',
                'has_tenant' => true,
                'has_active' => true,
                'order_by' => 'process_name',
            ],
            'lots' => [
                'table' => 'lots',
                'search_columns' => ['lot_number', 'specification'],
                'select' => ['id', 'lot_number', 'item_id', 'specification'],
                'title_field' => 'lot_number',
                'subtitle_field' => 'specification',
                'has_tenant' => true,
                'has_active' => false,
                'order_by' => 'lot_number',
            ],
            'users' => [
                'model' => \App\Models\User::class,
                'search_columns' => ['name', 'email'],
                'select' => ['id', 'name', 'email'],
                'title_field' => 'name',
                'subtitle_field' => 'email',
                'has_tenant' => false,
                'has_active' => false,
                'order_by' => 'name',
            ],
        ];
    }

    /**
     * 소스 테이블 통합 검색
     * GET /api/admin/source-tables/{table}/search?q=xxx&item_type=RM,SM&ids=1,2,3
     */
    public function search(Request $request, string $table): JsonResponse
    {
        $config = $this->getTableConfig()[$table] ?? null;

        if (! $config) {
            return response()->json([
                'success' => false,
                'message' => "지원하지 않는 테이블: {$table}",
            ], 400);
        }

        $tenantId = session('selected_tenant_id');
        $query = $request->input('q', '');

        // Eloquent 모델 또는 DB 쿼리빌더
        if (isset($config['model'])) {
            $builder = $config['model']::query();
        } else {
            $builder = DB::table($config['table'])->whereNull('deleted_at');
        }

        // 테넌트 필터
        if ($config['has_tenant'] && $tenantId) {
            $builder->where('tenant_id', $tenantId);
        }

        // 활성 필터
        if ($config['has_active']) {
            $builder->where('is_active', true);
        }

        // 검색어 필터
        if ($query) {
            $builder->where(function ($q) use ($query, $config) {
                foreach ($config['search_columns'] as $col) {
                    $q->orWhere($col, 'like', "%{$query}%");
                }
            });
        }

        // 추가 파라미터 필터 (item_type 등)
        if ($request->has('item_type')) {
            $builder->whereIn('item_type', explode(',', $request->input('item_type')));
        }

        // ID 목록으로 조회
        if ($request->has('ids')) {
            $builder->whereIn('id', explode(',', $request->input('ids')));
        }

        $results = $builder
            ->orderBy($config['order_by'])
            ->limit(30)
            ->get($config['select']);

        return response()->json([
            'success' => true,
            'data' => $results,
            'meta' => [
                'title_field' => $config['title_field'],
                'subtitle_field' => $config['subtitle_field'],
            ],
        ]);
    }

    /**
     * 사용 가능한 소스 테이블 목록
     * GET /api/admin/source-tables
     */
    public function tables(): JsonResponse
    {
        $config = $this->getTableConfig();

        $tables = collect($config)->map(function ($cfg, $key) {
            return [
                'key' => $key,
                'title_field' => $cfg['title_field'],
                'subtitle_field' => $cfg['subtitle_field'],
            ];
        })->values();

        // system_field_definitions에서 라벨 가져오기
        $labels = DB::table('system_field_definitions')
            ->select('source_table', 'source_table_label')
            ->groupBy('source_table', 'source_table_label')
            ->pluck('source_table_label', 'source_table')
            ->toArray();

        $tables = $tables->map(function ($t) use ($labels) {
            $t['label'] = $labels[$t['key']] ?? ucfirst($t['key']);

            return $t;
        });

        return response()->json([
            'success' => true,
            'data' => $tables,
        ]);
    }
}