<?php

namespace App\Module\Shop\Dtos;

use App\Module\Shop\Models\ShopPromotion;
use UCore\Dto\BaseDto;

/**
 * 商店促销活动数据传输对象
 * 
 * 用于在服务层和控制器层之间传递促销活动数据，避免直接暴露模型
 */
class ShopPromotionDto extends BaseDto
{
    /**
     * 促销活动ID
     *
     * @var int
     */
    public int $id;

    /**
     * 促销活动名称
     *
     * @var string
     */
    public string $name;

    /**
     * 促销活动描述
     *
     * @var string|null
     */
    public ?string $description;

    /**
     * 折扣类型（1:百分比折扣, 2:固定金额折扣）
     *
     * @var int
     */
    public int $discountType;

    /**
     * 折扣值
     *
     * @var int
     */
    public int $discountValue;

    /**
     * 是否激活
     *
     * @var bool
     */
    public bool $isActive;

    /**
     * 开始时间（时间戳）
     *
     * @var int|null
     */
    public ?int $startTime;

    /**
     * 结束时间（时间戳）
     *
     * @var int|null
     */
    public ?int $endTime;

    /**
     * 排序权重
     *
     * @var int
     */
    public int $sortOrder;

    /**
     * 创建时间
     *
     * @var string
     */
    public string $createdAt;

    /**
     * 更新时间
     *
     * @var string
     */
    public string $updatedAt;

    /**
     * 自定义折扣值（可选，来自促销商品关联表）
     *
     * @var int|null
     */
    public ?int $customDiscountValue = null;

    /**
     * 从模型创建DTO
     *
     * @param ShopPromotion $promotion 促销活动模型
     * @param int|null $customDiscountValue 自定义折扣值（可选）
     * @return self
     */
    public static function fromModel(ShopPromotion $promotion, ?int $customDiscountValue = null): self
    {
        $dto = new self();
        $dto->id = $promotion->id;
        $dto->name = $promotion->name;
        $dto->description = $promotion->description;
        $dto->discountType = $promotion->discount_type;
        $dto->discountValue = $promotion->discount_value;
        $dto->isActive = $promotion->is_active;
        $dto->startTime = $promotion->start_time ? $promotion->start_time->timestamp : null;
        $dto->endTime = $promotion->end_time ? $promotion->end_time->timestamp : null;
        $dto->sortOrder = $promotion->sort_order;
        $dto->createdAt = $promotion->created_at->toDateTimeString();
        $dto->updatedAt = $promotion->updated_at->toDateTimeString();
        $dto->customDiscountValue = $customDiscountValue;

        return $dto;
    }
}