package models

import (
	"encoding/json"
	"fmt"
	"time"
)

type Date [3]int

func ParseDate(s string) (Date, error) {
	date, err := time.ParseInLocation("2006-01-02", s, time.UTC)
	if err != nil {
		return [3]int{}, err
	}

	y, m, d := date.Date()
	return Date{y, int(m), d}, nil
}

func (d *Date) UnmarshalJSON(b []byte) error {
	var str string
	err := json.Unmarshal(b, &str)
	if err != nil {
		return err
	}

	*d, err = ParseDate(str)
	if err != nil {
		return err
	}

	return nil
}

func (d Date) String() string {
	return fmt.Sprintf("%04d-%02d-%02d", d[0], d[1], d[2])
}

func (d Date) MarshalJSON() ([]byte, error) {
	return []byte("\"" + d.String() + "\""), nil
}

func (d Date) ToTime() time.Time {
	return time.Date(d[0], time.Month(d[1]), d[2], 0, 0, 0, 0, time.UTC)
}