package entity

import (
	"database/sql/driver"
	"fmt"
	"github.com/google/uuid"
	"gorm.io/gorm"
	"strings"
	"time"
)

type Base struct {
	Id string `json:"id" gorm:"primaryKey;type:varchar(36);not null;comment:'主键'"`
	Timestamp
}

func (b *Base) BeforeCreate(*gorm.DB) (err error) {
	if b.Id == "" {
		b.Id = strings.ReplaceAll(uuid.NewString(), "-", "")
	}

	return
}

type JsonTime struct {
	time.Time
}

type Timestamp struct {
	CreatedAt JsonTime
	UpdatedAt JsonTime
}

func (jt JsonTime) MarshalJSON() ([]byte, error) {
	if jt.IsZero() {
		return []byte(`""`), nil
	}
	output := fmt.Sprintf("\"%s\"", jt.Format("2006-01-02 15:04:05"))
	return []byte(output), nil
}

func (jt JsonTime) Value() (driver.Value, error) {
	var zeroTime time.Time
	if jt.Time.UnixNano() == zeroTime.UnixNano() {
		return nil, nil
	}
	return jt.Time.Format("2006-01-02 15:04:05"), nil
}

func (jt *JsonTime) Scan(v interface{}) error {
	value, ok := v.(time.Time)
	if ok {
		*jt = JsonTime{Time: value}
		return nil
	}
	return fmt.Errorf("can not convert %v to timestamp", v)
}