<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;

class Product extends Model {
	const TYPE_NORMAL = 'normal';
	const TYPE_CROWDFUNDING = 'crowdfunding';
	const TYPE_SECKILL = 'seckill';
	public static $typeMap = [ 
			self::TYPE_NORMAL => '普通商品',
			self::TYPE_CROWDFUNDING => '众筹商品',
			self::TYPE_SECKILL => '秒杀商品'
	];
	protected $fillable = [ 
			'title',
			'description',
			'image',
			'on_sale',
			'rating',
			'sold_count',
			'review_count',
			'price',
			'type',
			'long_title' // 添加 long_title 到 $fillable 属性中
	];
	protected $casts = [ 
			'on_sale' => 'boolean' // on_sale 是一个布尔类型的字段
	];
	public function scopeByIds($query, $ids) {
		return $query->whereIn ( 'id', $ids )->orderByRaw ( sprintf ( "FIND_IN_SET(id, '%s')", join ( ',', $ids ) ) );
	}

	// 与商品SKU关联
	public function skus() {
		return $this->hasMany ( ProductSku::class );
	}
	public function category() {
		return $this->belongsTo ( Category::class );
	}
	public function properties() {
		return $this->hasMany ( ProductProperty::class );
	}
	public function crowdfunding() {
		return $this->hasOne ( CrowdfundingProduct::class );
	}
	public function seckill() {
		return $this->hasOne ( SeckillProduct::class );
	}
	public function getImageUrlAttribute() {
		// 如果 image 字段本身就已经是完整的 url 就直接返回
		if (Str::startsWith ( $this->attributes ['image'], [ 
				'http://',
				'https://'
		] )) {
			return $this->attributes ['image'];
		}
		return \Storage::disk ( 'public' )->url ( $this->attributes ['image'] );
	}
	public function getGroupedPropertiesAttribute() {
		return $this->properties->
		// 按照属性名聚合，返回的集合的 key 是属性名，value 是包含该属性名的所有属性集合
		groupBy ( 'name' )->map ( function ($properties) {
			// 使用 map 方法将属性集合变为属性值集合
			return $properties->pluck ( 'value' )->all ();
		} );
	}
	public function toESArray() {
		// 只取出需要的字段
		$arr = Arr::only ( $this->toArray (), [ 
				'id',
				'type',
				'title',
				'category_id',
				'long_title',
				'on_sale',
				'rating',
				'sold_count',
				'review_count',
				'price'
		] );

		// 如果商品有类目，则 category 字段为类目名数组，否则为空字符串
		$arr ['category'] = $this->category ? explode ( ' - ', $this->category->full_name ) : '';
		// 类目的 path 字段
		$arr ['category_path'] = $this->category ? $this->category->path : '';
		// strip_tags 函数可以将 html 标签去除
		$arr ['description'] = strip_tags ( $this->description );
		// 只取出需要的 SKU 字段
		$arr ['skus'] = $this->skus->map ( function (ProductSku $sku) {
			return Arr::only ( $sku->toArray (), [ 
					'title',
					'description',
					'price'
			] );
		} );
		// 只取出需要的商品属性字段
		$arr ['properties'] = $this->properties->map ( function (ProductProperty $property) {
			// 对应地增加一个 search_value 字段，用符号 : 将属性名和属性值拼接起来
			return array_merge ( array_only ( $property->toArray (), [ 
					'name',
					'value'
			] ), [ 
					'search_value' => $property->name . ':' . $property->value
			] );
		} );

		return $arr;
	}
	
	public function setImageListAttribute($pictures)
	{
		if (is_array($pictures)) {
			$this->attributes['image_list'] = json_encode($pictures);
		}
	}
	
	public function getImageListAttribute($pictures)
	{
		return json_decode($pictures, true);
	}
	public function decreaseStock($amount)
	{
		if ($amount < 0) {
			throw new InternalException('减库存不可小于0');
		}
		
		return $this->where('id', $this->id)->where('stock', '>=', $amount)->decrement('stock', $amount);
	}
}