<?php

namespace App\Services;

use App\Models\Products\CommonCode;
use App\Models\Products\Product;
use App\Models\Commons\Category;
use Illuminate\Support\Facades\Validator;
use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;

class ProductService extends Service
{

    /**
     * 카테고리 트리 전체 조회 (parent_id = null 기준)
     */
    public function getCategory($request)
    {
        $parentId = $request->parentId ?? null;
        $group = $request->group ?? 'category';

        // 재귀적으로 트리 구성
        $list = $this->fetchCategoryTree($parentId, $group);

        return $list;
    }

    /**
     * 내부 재귀 함수 (하위 카테고리 트리 구조로 구성)
     */
    protected function fetchCategoryTree(?int $parentId = null)
    {
        $tenantId = $this->tenantId(); // Base Service에서 상속받은 메서드

        $query = Category::query()
            ->when($tenantId, fn($q) => $q->where('tenant_id', $tenantId))
            ->when(
                is_null($parentId),
                fn($q) => $q->whereNull('parent_id'),
                fn($q) => $q->where('parent_id', $parentId)
            )
            ->where('is_active', 1)
            ->orderBy('sort_order');

        $categories = $query->get();

        foreach ($categories as $category) {
            $children = $this->fetchCategoryTree($category->id);
            $category->setRelation('children', $children);
        }

        return $categories;
    }

    /**
     * (예시) 기존의 flat 리스트 조회
     */
    public static function getCategoryFlat($group = 'category')
    {
        $query = CommonCode::where('code_group',$group)->whereNull('parent_id');
        return $query->get();
    }

    // 목록/검색
    public function index(array $params)
    {
        $tenantId = $this->tenantId();

        $size = (int)($params['size'] ?? 20);
        $q    = trim((string)($params['q'] ?? ''));
        $categoryId  = $params['category_id'] ?? null;
        $productType = $params['product_type'] ?? null; // PRODUCT|PART|SUBASSEMBLY...
        $active      = $params['active'] ?? null;       // 1/0

        $query = Product::query()
            ->with('category:id,name') // 필요한 컬럼만 가져오기
            ->where('tenant_id', $tenantId);

        if ($q !== '') {
            $query->where(function ($w) use ($q) {
                $w->where('name', 'like', "%{$q}%")
                    ->orWhere('code', 'like', "%{$q}%")
                    ->orWhere('description', 'like', "%{$q}%");
            });
        }
        if ($categoryId)  $query->where('category_id', (int)$categoryId);
        if ($productType) $query->where('product_type', $productType);
        if ($active !== null && $active !== '') $query->where('is_active', (int)$active);

        $paginator = $query->orderBy('id')->paginate($size);

        // 날짜 형식을 위해 분리
        $paginator->setCollection(
            $paginator->getCollection()->transform(function ($item) {
                $arr = $item->toArray();
                $arr['created_at'] = $item->created_at
                    ? $item->created_at->format('Y-m-d')
                    : null;
                return $arr;
            })
        );

        return $paginator;
    }

    // 생성
    public function store(array $data)
    {
        $tenantId = $this->tenantId();
        $userId   = $this->apiUserId();

        $v = Validator::make($data, [
            'code'           => 'required|string|max:30',
            'name'           => 'required|string|max:100',
            'category_id'    => 'required|integer',
            'product_type'   => 'required|string|max:30',
            'attributes'     => 'nullable|array',
            'description'    => 'nullable|string|max:255',
            'is_sellable'    => 'nullable|in:0,1',
            'is_purchasable' => 'nullable|in:0,1',
            'is_producible'  => 'nullable|in:0,1',
            'is_active'      => 'nullable|in:0,1',
        ]);
        $payload = $v->validate();

        // tenant별 code 유니크 수동 체크(운영 전 DB 유니크 구성도 권장)
        $dup = Product::query()
            ->where('tenant_id', $tenantId)
            ->where('code', $payload['code'])
            ->exists();
        if ($dup) throw new BadRequestHttpException(__('error.duplicate_key'));

        $payload['tenant_id']      = $tenantId;
        $payload['created_by']     = $userId;
        $payload['is_sellable']    = $payload['is_sellable']    ?? 1;
        $payload['is_purchasable'] = $payload['is_purchasable'] ?? 0;
        $payload['is_producible']  = $payload['is_producible']  ?? 1;
        $payload['is_active']      = $payload['is_active']      ?? 1;

        // attributes array → json 저장 (Eloquent casts가 array면 그대로 가능)
        return Product::create($payload);
    }

    // 단건
    public function show(int $id)
    {
        $tenantId = $this->tenantId();
        $p = Product::query()->where('tenant_id', $tenantId)->find($id);
        if (!$p) throw new BadRequestHttpException(__('error.not_found'));
        return $p;
    }

    // 수정
    public function update(int $id, array $data)
    {
        $tenantId = $this->tenantId();
        $userId   = $this->apiUserId();

        $p = Product::query()->where('tenant_id', $tenantId)->find($id);
        if (!$p) throw new BadRequestHttpException(__('error.not_found'));

        $v = Validator::make($data, [
            'code'           => 'sometimes|string|max:30',
            'name'           => 'sometimes|string|max:100',
            'category_id'    => 'sometimes|integer',
            'product_type'   => 'sometimes|string|max:30',
            'attributes'     => 'nullable|array',
            'description'    => 'nullable|string|max:255',
            'is_sellable'    => 'nullable|in:0,1',
            'is_purchasable' => 'nullable|in:0,1',
            'is_producible'  => 'nullable|in:0,1',
            'is_active'      => 'nullable|in:0,1',
        ]);
        $payload = $v->validate();

        if (isset($payload['code']) && $payload['code'] !== $p->code) {
            $dup = Product::query()
                ->where('tenant_id', $tenantId)
                ->where('code', $payload['code'])
                ->exists();
            if ($dup) throw new BadRequestHttpException(__('error.duplicate_key'));
        }

        $payload['updated_by'] = $userId;
        $p->update($payload);
        return $p->refresh();
    }

    // 삭제(soft)
    public function destroy(int $id): void
    {
        $tenantId = $this->tenantId();
        $p = Product::query()->where('tenant_id', $tenantId)->find($id);
        if (!$p) throw new BadRequestHttpException(__('error.not_found'));
        $p->delete();
    }

    // 간편 검색(모달/드롭다운)
    public function search(array $params)
    {
        $tenantId = $this->tenantId();
        $q   = trim((string)($params['q'] ?? ''));
        $lim = (int)($params['limit'] ?? 20);

        $qr = Product::query()->where('tenant_id', $tenantId);
        if ($q !== '') {
            $qr->where(function ($w) use ($q) {
                $w->where('name', 'like', "%{$q}%")
                    ->orWhere('code', 'like', "%{$q}%");
            });
        }
        return $qr->orderBy('name')->limit($lim)->get(['id','code','name','product_type','category_id','is_active']);
    }

    // 활성 토글
    public function toggle(int $id)
    {
        $tenantId = $this->tenantId();
        $userId   = $this->apiUserId();

        $p = Product::query()->where('tenant_id', $tenantId)->find($id);
        if (!$p) throw new BadRequestHttpException(__('error.not_found'));

        $p->is_active = $p->is_active ? 0 : 1;
        $p->updated_by = $userId;
        $p->save();

        return ['id' => $p->id, 'is_active' => (int)$p->is_active];
    }


}