// 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 imports

import (
	"context"
	"database/sql"
	"errors"
	"os"
	"path/filepath"

	"gemma.intevation.de/gemma/pkg/soap"
	"gemma.intevation.de/gemma/pkg/soap/nts"
)

// UploadedGaugeMeasurement is an Jon to extract gauge measurement data
// from an uploaded XML file and stores it into the database.
type UploadedGaugeMeasurement struct {
	Dir string `json:"dir"`
}

// UGMJobKind is the unique name of this import job type.
const UGMJobKind JobKind = "ugm"

type ugmJobCreator struct{}

func init() { RegisterJobCreator(UGMJobKind, ugmJobCreator{}) }

func (ugmJobCreator) Description() string { return "uploaded gauge measurements" }

func (ugmJobCreator) Create() Job { return new(UploadedGaugeMeasurement) }

func (ugmJobCreator) Depends() [2][]string { return gmJobCreator{}.Depends() }

func (ugmJobCreator) AutoAccept() bool { return true }

// StageDone is a NOP for gauge measurements imports.
func (ugmJobCreator) StageDone(context.Context, *sql.Tx, int64, Feedback) error { return nil }

// CleanUp removes the temporary files from the filesystem.
func (ugm *UploadedGaugeMeasurement) CleanUp() error { return os.RemoveAll(ugm.Dir) }

// Do executes the actual uploaded gauge measurement import.
func (ugm *UploadedGaugeMeasurement) Do(
	ctx context.Context,
	importID int64,
	conn *sql.Conn,
	feedback Feedback,
) (interface{}, error) {

	fetch := func() ([]*nts.RIS_Message_Type, error) {

		var dst nts.Get_messages_result

		if err := soap.ValidateFile(
			filepath.Join(ugm.Dir, "data.xml"),
			"NtS.xsd",
			&dst,
		); err != nil {
			return nil, err
		}

		if len(dst.Result_message) == 0 {
			return nil, errors.New("no gauge measurements found")
		}
		return dst.Result_message, nil
	}

	return storeGaugeMeasurements(
		ctx,
		importID,
		fetch,
		conn,
		feedback,
	)
}