<?php

namespace App\Imports;

use App\Models\Product;
use App\Models\Category;
use App\Models\Language;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Log;
use Maatwebsite\Excel\Concerns\SkipsEmptyRows;
use Maatwebsite\Excel\Concerns\ToCollection;
use Maatwebsite\Excel\Concerns\WithHeadingRow;
use Maatwebsite\Excel\Concerns\WithValidation;
use Maatwebsite\Excel\Imports\HeadingRowFormatter;

HeadingRowFormatter::default('none');

class ProductsImport implements SkipsEmptyRows, ToCollection, WithHeadingRow, WithValidation
{
    public function collection(Collection $rows)
    {
        foreach ($rows as $row) {

            try {

                $data = $this->mapRow($row);
                


                $name = $data['name'];
                $description = html_entity_decode($data['description']);

  
                $baseSlug = slug($data['slug'] ?? $name);

                // $count = Product::where('slug', 'LIKE', $baseSlug . '%')->count();
                // $slug = $count ? $baseSlug . '-' . $count : $baseSlug;
                
                
                $baseSlug = slug($data['slug'] ?? $name);

                if (Product::where('slug', $baseSlug)->exists()) {
                    \Log::info('Duplicate product skipped', [
                        'name' => $name,
                        'slug' => $baseSlug
                    ]);
                
                    continue;
                }
                
                $slug = $baseSlug;

                $product = Product::create([
                    'name' => $data['name'],
                    'slug' => $slug,
                    'latin_name' => $data['latin_name'],
                    'brand_id' => $data['brand_id'],
                    'weight' => $data['weight'],
                    'meta_title' => $data['meta_title'],
                    'short_description' => $data['short_description'],
                    'description' => html_entity_decode($data['description']),
                    'price' => $data['price'] ?? 0,
                    'stock' => $data['stock'] ?? 0,
                    'code' => $data['code'] ?? 0,
                    'country_code' => $data['country_code'] ?? 0,
                    'status' => $data['status'] ?? 1,
                    'image' => 'storage/photos/shares/'.$data['image'] ?? null,
                ]);

                $categories = [];

                if (!empty($data['category_id'])) {

                    $categoryIds = is_string($data['category_id'])
                        ? explode(',', $data['category_id'])
                        : [$data['category_id']];

                    foreach ($categoryIds as $index => $categoryId) {

                        $categoryId = (int) trim($categoryId);

                        if ($categoryId && Category::find($categoryId)) {
                            $categories[$categoryId] = [
                                'is_main' => $index === 0
                            ];
                        }
                    }
                }

                if (!empty($categories)) {
                    $product->categories()->attach($categories);
                }
            } catch (\Exception $e) {
                Log::error('Product Import Error', [
                    'message' => $e->getMessage(),
                    'row' => $row
                ]);

                continue;
            }
        }
    }


    private function mapRow($row)
    {
        return [
            'excel_id' => $this->getValue($row, ['شناسه محصول', 'id', 'product_id']),

            'name' => $this->getValue($row, ['نام محصول', 'name']),

            'latin_name' => $this->getValue($row, ['نام انگلیسی', 'latin_name']),
            'brand_id' => $this->getValue($row, ['برند', 'brand_id']),

            'slug' => $this->getValue($row, ['اسلاگ', 'slug']),
            'weight' => $this->getValue($row, ['وزن', 'weight']),
            'meta_title' => $this->getValue($row, ['عنوان صفحه', 'meta_title']),
            'short_description' => $this->getValue($row, ['توضیحات کوتاه', 'short_description']),

            'image' => $this->getValue($row, ['عکس', 'image']),

            'price' => $this->getValue($row, ['قیمت', 'price']),

            'stock' => $this->getValue($row, ['موجودی', 'stock']),
            
            'code' => $this->getValue($row, ['کد', 'code']),
            
            'country_code' => $this->getValue($row, ['کد کشور', 'country_code']),

            'category_id' => $this->getValue($row, ['دسته بندی', 'category_id']),

            'status' => $this->getValue($row, ['وضعیت', 'status']),

            'description' => $this->getValue($row, ['توضیحات', 'description']),
        ];
    }

    private function getValue($row, array $keys)
    {
        foreach ($keys as $key) {
            if (isset($row[$key]) && $row[$key] !== null) {
                return $row[$key];
            }
        }

        return null;
    }

    public function rules(): array
    {
        return [
            'نام محصول' => ['required', 'max:255'],
            'قیمت' => ['nullable', 'numeric'],
            'موجودی' => ['nullable', 'integer'],
        ];
    }


    public function batchSize(): int
    {
        return 1000;
    }
}