<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\Relations\HasOne;
use Modules\SystemTool\Models\SysFileModel;

/**
 * 客户等级模型（同一商品按等级上浮比例定价：售价 = 成本价 × (100 + percent) / 100）
 */
class CustomerLevelModel extends Model
{
    use HasFactory;

    /** 状态：停用 */
    public const int STATUS_DISABLED = 0;
    /** 状态：正常 */
    public const int STATUS_NORMAL = 1;

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

    protected $fillable = [
        'name',
        'percent',
        'sort',
        'status',
        'icon_id'
    ];

    protected $casts = [
        'percent' => 'decimal:2',
        'sort' => 'integer',
        'status' => 'integer',
        'created_at' => 'datetime:Y-m-d H:i:s',
        'updated_at' => 'datetime:Y-m-d H:i:s',
    ];

    protected $appends = ['icon_url'];

    /**
     * 关联图标
     */
    public function icon(): HasOne
    {
        return $this->hasOne(SysFileModel::class, 'id', 'icon_id');
    }

    // 图标链接
    public function getIconUrlAttribute()
    {
        if($this->icon) {
            return $this->icon->preview_url;
        }
        return null;
    }

    /**
     * 该等级下的门店
     */
    public function stores(): HasMany
    {
        return $this->hasMany(StoreModel::class, 'level_id', 'id');
    }

    /**
     * 按等级上浮比例计算售价（统一换算入口，金额走 bcmath 保证两位小数精度）
     *
     * 售价 = 成本价 × (100 + percent) / 100（四舍五入保留两位）。
     *
     * @param string|int|float $costPrice 商品成本价（decimal cast 字符串）
     * @param string|int|float $percent   价格上浮比例（30 = 上浮 30%）
     * @return string 两位小数字符串，如 '13.05'
     */
    public static function calcLevelPrice(string|int|float $costPrice, string|int|float $percent): string
    {
        $multiplier = bcadd('100', (string) $percent, 4);
        return bcdiv(bcmul((string) $costPrice, $multiplier, 4), '100', 2);
    }
}