package models

import (
	"encoding/json"
	"fmt"

	"github.com/robfig/cron"

	"gemma.intevation.de/gemma/pkg/scheduler"
)

// 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>

type (
	CronSpec   string
	ImportKind string

	ImportConfig struct {
		Kind ImportKind `json:"kind"`
		Cron CronSpec   `json:"cron"`
		URL  *string    `json:"url"`
	}
)

func (ik *ImportKind) UnmarshalJSON(data []byte) error {
	var s string
	if err := json.Unmarshal(data, &s); err != nil {
		return err
	}

	if !scheduler.HasAction(s) {
		return fmt.Errorf("Unknown kind '%s'", s)
	}

	*ik = ImportKind(s)

	return nil
}

func (cs *CronSpec) UnmarshalJSON(data []byte) error {
	var spec string
	if err := json.Unmarshal(data, &spec); err != nil {
		return err
	}
	if _, err := cron.Parse(spec); err != nil {
		return err
	}
	*cs = CronSpec(spec)
	return nil
}