<?php

namespace App\Imports;

use App\Models\ProductSpec;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\DB;
use Maatwebsite\Excel\Concerns\ToCollection;

class ProductSpecImport implements ToCollection
{
	private int $product_id;
	private array $keys;

	public function __construct(int $product_id)
	{
		$this->product_id = $product_id;
	}

	public function collection(Collection $collection)
    {
		if ($collection->isEmpty()) {
			return;
		}

		//校验数组count()是否正确
		if (count($collection[0]) < 6) {
			throw new \Exception('Excel产品规格格式不正确');
		}

		$this->keys = array_flip($collection[0]->toArray());

		//去除第一行的标题
		unset($collection[0]);

		$this->createData($collection);
    }

	private function createData($rows)
	{
		$keys = $this->keys;
		DB::beginTransaction();
		foreach ($rows as $row) {
			# Excel日期是从1900-01-01起的天数，PHP日期是1970-01-01起，所以要减去25569天数得到正确日期
			$row[$keys['日期']] = date('Y-m-d', strtotime('+ ' . ($row[$keys['日期']] - 25569) . 'day', 0));

			ProductSpec::updateOrCreate([
				'product_id' => $this->product_id,
				'name' => $row[$keys['规格名称']],
				'date' => $row[$keys['日期']],
			], [
				'product_id' => $this->product_id,
				'name' => $row[$keys['规格名称']],
				'date' => $row[$keys['日期']],
				'stock' => $row[$keys['库存']],
				'original_price' => $row[$keys['市场价']],
				'price' => $row[$keys['销售价']],
				'cost_price' => $row[$keys['成本价']],
			]);
		}
		DB::commit();
	}
}