package model

import (
	"errors"
	"fmt"
	"time"
)

type Date time.Time

func (d Date) Equal(other Date) bool {
	// usec and nsec are lost in ISO8601 conversion
	dr := time.Time(d).Round(time.Minute)
	or := time.Time(other).Round(time.Minute)

	return dr.Equal(or)
}

func (d Date) After(other Date) bool {
	return time.Time(d).After(time.Time(other))
}

func (d Date) Before(other Date) bool {
	return time.Time(d).Before(time.Time(other))
}

func (d Date) Format(layout string) string {
	return time.Time(d).Format(layout)
}

func (d Date) MarshalJSON() ([]byte, error) {
	// Must use ISO8601
	formatted := fmt.Sprintf("\"%s\"", time.Time(d).Format("2006-01-02T15:04:05+00:00"))
	return []byte(formatted), nil
}

func (d *Date) UnmarshalJSON(data []byte) error {
	if len(data) < 2 || data[0] != '"' || data[len(data)-1] != '"' {
		return errors.New("Time.UnmarshalJSON: input is not a JSON string")
	}

	data = data[len(`"`) : len(data)-len(`"`)]

	var err error
	var t time.Time
	t, err = time.ParseInLocation("2006-01-02T15:04:05+00:00", string(data), time.Now().Location())
	if err != nil {
		return err
	}

	*d = Date(t)
	return nil
}