package com.org.flashsalesystem.entity;

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

import javax.persistence.*;
import java.math.BigDecimal;
import java.time.LocalDateTime;

@Entity
@Table(name = "group_buying")
@Data
@NoArgsConstructor
@AllArgsConstructor
public class GroupBuying {

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

    @Column(name = "product_id", nullable = false)
    private Long productId;

    @Column(name = "group_price", nullable = false, precision = 10, scale = 2)
    private BigDecimal groupPrice;

    @Column(name = "required_members", nullable = false)
    private Integer requiredMembers = 2;

    @Column(name = "duration_minutes", nullable = false)
    private Integer durationMinutes = 1440;

    @Column(name = "total_stock", nullable = false)
    private Integer totalStock;

    @Column(name = "remaining_stock", nullable = false)
    private Integer remainingStock;

    @Column(name = "max_per_user", nullable = false)
    private Integer maxPerUser = 1;

    /**
     * 状态：0-草稿 1-未开始 2-进行中 3-已结束
     */
    @Column(nullable = false)
    private Integer status = 0;

    @Column(name = "start_time", nullable = false)
    private LocalDateTime startTime;

    @Column(name = "end_time", nullable = false)
    private LocalDateTime endTime;

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

    @Column(name = "updated_at")
    private LocalDateTime updatedAt;

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

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

    @PreUpdate
    protected void onUpdate() {
        updatedAt = LocalDateTime.now();
    }

    public boolean isActive() {
        LocalDateTime now = LocalDateTime.now();
        return now.isAfter(startTime) && now.isBefore(endTime) && status == 2;
    }

    public enum GroupBuyingStatus {
        DRAFT(0, "草稿"),
        PENDING(1, "未开始"),
        ACTIVE(2, "进行中"),
        ENDED(3, "已结束");

        private final int code;
        private final String description;

        GroupBuyingStatus(int code, String description) {
            this.code = code;
            this.description = description;
        }

        public int getCode() { return code; }
        public String getDescription() { return description; }
    }
}