<?php
namespace app\model;

use think\Model;
use think\model\relation\HasOne;

class Sku extends Base
{
    // SKU 状态
    public const STATUS_ON = '1'; // 出售中
    public const STATUS_OFF = '0'; // 已下架

    // SKU 积分兑换限制
    public const ALLOW_ONLY_BUY         = '0';
    public const ALLOW_BUY_AND_SCORE    = '1';
    public const ALLOW_ONLY_SCORE       = '2';


    public static function statusTextList(): array
    {
        return [
            (string)self::STATUS_ON     => '在售',
            (string)self::STATUS_OFF    => '已下架',
        ];
    }

    public static function allowScoreTextList(): array
    {
        return [
            (string)self::ALLOW_ONLY_BUY        => '购买',
            (string)self::ALLOW_BUY_AND_SCORE   => '购买或积分兑换',
            (string)self::ALLOW_ONLY_SCORE      => '积分兑换',
        ];
    }

    public static function onAfterInsert(Model $item)
    {
        $item->sort = $item->id;
        $item->save();
    }

    /**
     * 模型关联：商品分类
     *
     * @return HasOne
     */
    public function category(): HasOne
    {
        return $this->hasOne(SkuCategory::class, 'id', 'category_id');
    }

    /**
     * 生成 SKU coding
     * 年份 + 2位随机码 + 时间戳（秒[10位] + 微妙[4位]）
     * @length 18
     */
    public static function generateCoding(): string
    {
        $randStr    = str_pad(mt_rand(1,99), 2, '0', STR_PAD_LEFT);
        $prefix     = date('y').$randStr;
        $mt         = microtime(true);
        list($time, $micro) = explode('.', $mt);
        $micro      = str_pad($micro, 4, '0', STR_PAD_RIGHT);
        $micro      = substr($micro, 0, 4);

        return $prefix.$time.$micro;
    }

    /**
     * @return HasOne
     */
    public function spu(): HasOne
    {
        return $this->hasOne(Spu::class, 'id', 'spu_id');
    }

    /**
     * 关联活动商品
     *
     * @return HasOne
     */
    public function activity(): HasOne
    {
        return $this->hasOne(SpuActivity::class, 'id', 'spu_activity_id');
    }
}