<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\SoftDeletes;

/**
 * 商品档案模型（品名/规格包规/供应商/等级/多等级价格体系）
 */
class ProductModel extends Model
{
    use SoftDeletes, HasFactory;

    /** 状态：下架 */
    public const STATUS_OFF = 0;
    /** 状态：上架 */
    public const STATUS_ON = 1;

    protected $table = 'product';
    protected $primaryKey = 'id';

    protected $fillable = [
        'category_id',
        'supplier_id',
        'name',
        'spec',
        'grade',
        'unit',
        'image',
        'sort',
        'status',
        'remark',
    ];

    protected $casts = [
        'category_id' => 'integer',
        'supplier_id' => 'integer',
        'sort' => 'integer',
        'status' => 'integer',
    ];

    /**
     * 所属分类
     */
    public function category(): BelongsTo
    {
        return $this->belongsTo(ProductCategoryModel::class, 'category_id', 'id');
    }

    /**
     * 供货供应商
     */
    public function supplier(): BelongsTo
    {
        return $this->belongsTo(SupplierModel::class, 'supplier_id', 'id');
    }

    /**
     * 多等级价格（同一商品按客户等级定价）
     */
    public function prices(): HasMany
    {
        return $this->hasMany(ProductPriceModel::class, 'product_id', 'id');
    }
}