package com.org.flashsalesystem.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.*;
import javax.validation.constraints.DecimalMin;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import java.math.BigDecimal;
import java.time.LocalDateTime;

/**
 * 秒杀活动实体类
 * 对应数据库flash_sales表
 */
@Entity
@Table(name = "flash_sales")
@Data
@NoArgsConstructor
@AllArgsConstructor
public class FlashSale {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @NotNull(message = "商品ID不能为空")
    @Column(name = "product_id", nullable = false)
    private Long productId;

    @NotNull(message = "秒杀价格不能为空")
    @DecimalMin(value = "0.01", message = "秒杀价格必须大于0")
    @Column(name = "flash_price", nullable = false, precision = 10, scale = 2)
    private BigDecimal flashPrice;

    @Min(value = 1, message = "秒杀库存必须大于0")
    @Column(name = "flash_stock", nullable = false)
    private Integer flashStock;

    @NotNull(message = "开始时间不能为空")
    @Column(name = "start_time", nullable = false)
    private LocalDateTime startTime;

    @NotNull(message = "结束时间不能为空")
    @Column(name = "end_time", nullable = false)
    private LocalDateTime endTime;

    /**
     * 活动状态：1-未开始，2-进行中，3-已结束
     */
    @Column(nullable = false)
    private Integer status = 1;

    @Column(name = "created_at", nullable = false, updatable = false)
    private LocalDateTime createdAt;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "product_id", insertable = false, updatable = false)
    private Product product;

    @PrePersist
    protected void onCreate() {
        createdAt = LocalDateTime.now();
    }

    /**
     * 检查活动是否已开始
     */
    public boolean isStarted() {
        return LocalDateTime.now().isAfter(startTime);
    }

    /**
     * 检查活动是否已结束
     */
    public boolean isEnded() {
        return LocalDateTime.now().isAfter(endTime);
    }

    /**
     * 检查活动是否正在进行中
     */
    public boolean isActive() {
        LocalDateTime now = LocalDateTime.now();
        return now.isAfter(startTime) && now.isBefore(endTime) && status == 2;
    }
}