// This is Free Software under GNU Affero General Public License v >= 3.0
// without warranty, see README.md and license for details.
//
// SPDX-License-Identifier: AGPL-3.0-or-later
// License-Filename: LICENSES/AGPL-3.0.txt
//
// Copyright (C) 2018 by via donau
//   – Österreichische Wasserstraßen-Gesellschaft mbH
// Software engineering by Intevation GmbH
//
// Author(s):
//  * Sascha L. Teichmann <sascha.teichmann@intevation.de>

package models

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

var (
	errNoString    = errors.New("Not a string")
	errNoByteSlice = errors.New("Not a byte slice")
)

// WGS84 is the EPSG of the World Geodetic System 1984.
const WGS84 = 4326

const DateFormat = "2006-01-02"

type Date struct{ time.Time }

func (srd Date) MarshalJSON() ([]byte, error) {
	return json.Marshal(srd.Format(DateFormat))
}

func (srd *Date) UnmarshalJSON(data []byte) error {
	var s string
	if err := json.Unmarshal(data, &s); err != nil {
		return err
	}
	d, err := time.Parse(DateFormat, s)
	if err == nil {
		*srd = Date{d}
	}
	return err
}