<?php

namespace App\Models;

use App\Casts\JsonArray;
use App\Casts\Price;
use App\Traits\Release;
use App\Traits\SkuInfo;
use Dcat\Admin\Traits\HasDateTimeFormatter;
use EloquentFilter\Filterable;
use Illuminate\Database\Eloquent\Model;

class ProductSku extends Model
{
    use Filterable;
    use HasDateTimeFormatter;
    use Release;
    use SkuInfo;

    /**
     * @var array
     */
    protected $attributes = [
        'weight' => 0,
        'stock' => 0,
        'sales' => 0,
    ];

    /**
     * @var array
     */
    protected $casts = [
        'images' => JsonArray::class,
        'sell_price' => Price::class,
        'market_price' => Price::class,
        'cost_price' => Price::class,
        'vip_price' => Price::class,
        'attrs' => JsonArray::class,
        'specs' => 'json',
        'release_at' => 'datetime',
    ];

    /**
     * @var array
     */
    protected $fillable = [
        'spu_id',
        'name',
        'subtitle',
        'category_id',
        'codcovere',
        'images',
        'sell_price',
        'market_price',
        'cost_price',
        'vip_price',
        'media',
        'weight',
        'shipping_template_id',
        'attrs',
        'specs',
        'stock',
        'sales',
        'release_at',
    ];

    /**
     * 仅查询已上架的商品
     *
     * @param \Illuminate\Database\Eloquent\Builder $query
     * @return \Illuminate\Database\Eloquent\Builder
     */
    public function scopeOnline($query)
    {
        return $query->whereNotNull('release_at');
    }

    /**
     * 此商品所属的 SPU
     */
    public function spu()
    {
        return $this->belongsTo(ProductSpu::class, 'spu_id');
    }

    /**
     * 此商品所属的分类
     */
    public function category()
    {
        return $this->belongsTo(ProductCategory::class, 'category_id');
    }

    /**
     * 此商品所属的分区
     */
    public function parts()
    {
        return $this->belongsToMany(ProductPart::class, ProductPartSku::class, 'sku_id', 'part_id');
    }

    /**
     * 此商品的赠品
     */
    public function gifts()
    {
        return $this->hasMany(ProductGift::class, 'sku_id');
    }

    /**
     * 此商品的购买须知
     */
    public function buynote()
    {
        return $this->belongsTo(ProductBuynote::class, 'buynote_id');
    }

    /**
     * 确认此商品是否已上架
     *
     * @return bool
     */
    public function isOnline(): bool
    {
        return $this->release_at !== null;
    }

    /**
     * 获取此商品的可售库存
     *
     * @return int
     */
    public function getSaleableStockAttribute(): int
    {
        if ($this->isOnline()) {
            return $this->attributes['stock'];
        }

        return 0;
    }
}