package main

import (
	"database/sql/driver"
	"encoding/json"
	"fmt"
	"time"
)

type Duration struct {
	time.Duration
}

func (d Duration) MarshalJSON() ([]byte, error) {
	return json.Marshal(d.String())
}

func (d *Duration) UnmarshalJSON(b []byte) error {
	var v interface{}
	if err := json.Unmarshal(b, &v); err != nil {
		return err
	}

	switch value := v.(type) {
	case float64:
		d.Duration = time.Duration(value)
		return nil
	case string:
		var err error
		d.Duration, err = time.ParseDuration(value)
		if err != nil {
			return err
		}
		return nil
	default:
		return fmt.Errorf("invalid duration")
	}
}

func (d *Duration) Scan(value interface{}) error {
	str, ok := value.(string)
	if !ok {
		return fmt.Errorf("failed to unmarshal string value: %v", value)
	}

	var err error
	d.Duration, err = time.ParseDuration(str)
	return err
}

func (d Duration) Value() (driver.Value, error) {
	return d.Duration.String(), nil
}

func (Duration) GormDataType() string {
	return "TEXT"
}