package ru.ulstu.model;

import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
import javax.persistence.Version;
import javax.validation.constraints.NotNull;
import java.io.Serializable;

@MappedSuperclass
public abstract class BaseEntity implements Serializable, Comparable<BaseEntity> {
    @Id
    @GeneratedValue(strategy = GenerationType.TABLE)
    private Integer id;

    @Version
    private Integer version;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public Integer getVersion() {
        return version;
    }

    public void setVersion(Integer version) {
        this.version = version;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (!getClass().isAssignableFrom(obj.getClass())) {
            return false;
        }
        BaseEntity other = (BaseEntity) obj;
        if (id == null) {
            if (other.id != null) {
                return false;
            }
        } else if (!id.equals(other.id)) {
            return false;
        }
        return true;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + (id == null ? 0 : id.hashCode());
        return result;
    }

    @Override
    public String toString() {
        return getClass().getSimpleName() + "{" +
                "id=" + id +
                ", version=" + version +
                '}';
    }

    @Override
    public int compareTo(@NotNull BaseEntity o) {
        return id != null ? id.compareTo(o.getId()) : -1;
    }

    public void reset() {
        this.id = null;
        this.version = null;
    }
}