// 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"
	"fmt"
	"time"

	"gemma.intevation.de/gemma/pkg/common"
	"gemma.intevation.de/gemma/pkg/log"
	"gemma.intevation.de/gemma/pkg/models"
	"gemma.intevation.de/gemma/pkg/scheduler"
)

func init() {
	run := func(cfgID int64) {
		jobID, err := RunConfiguredImport(cfgID)
		if err != nil {
			log.Errorf("running scheduled import failed: %v\n", err)
			return
		}
		log.Infof("added import #%d to queue\n", jobID)
	}

	for kind := range kindToImportModel {
		scheduler.RegisterAction(string(kind), run)
	}
}

// RunConfiguredImportContext runs an import configured from the database.
func RunConfiguredImportContext(ctx context.Context, conn *sql.Conn, id int64) (int64, error) {
	cfg, err := LoadPersistentConfigContext(ctx, conn, id)
	return runConfiguredImport(id, cfg, err)
}

// RunConfiguredImport runs an import configured from the database.
func RunConfiguredImport(id int64) (int64, error) {
	cfg, err := loadPersistentConfig(id)
	return runConfiguredImport(id, cfg, err)
}

func runConfiguredImport(id int64, cfg *PersistentConfig, err error) (int64, error) {

	if err != nil {
		return 0, err
	}
	if cfg == nil {
		return 0, fmt.Errorf("no config found for id %d", id)
	}

	kind := JobKind(cfg.Kind)

	ctor := ImportModelForJobKind(kind)
	if ctor == nil {
		return 0, fmt.Errorf("no constructor for kind '%s'", cfg.Kind)
	}

	what := ctor()

	// Fill the data structure
	if err := cfg.Attributes.Unmarshal(what); err != nil {
		return 0, err
	}

	converted := ConvertToInternal(kind, what)
	if converted == nil {
		return 0, fmt.Errorf("conversion of model for kind '%s' failed", kind)
	}

	var serialized string
	if serialized, err = common.ToJSONString(converted); err != nil {
		return 0, err
	}

	// Extract the job runtime parameters.
	var (
		email     bool
		due       time.Time
		trys      *int
		waitRetry *time.Duration
	)

	if gqc, ok := what.(models.QueueConfigurationGetter); ok {
		qc := gqc.GetQueueConfiguration()
		if qc.Due != nil {
			due = qc.Due.Time
		}
		trys = qc.Trys
		if qc.WaitRetry != nil {
			waitRetry = &qc.WaitRetry.Duration
		}
	}

	if ge, ok := what.(models.EmailTypeGetter); ok {
		email = ge.GetEmailType().Email
	}

	var jobID int64
	if jobID, err = AddJob(
		kind,
		due,
		trys,
		waitRetry,
		cfg.User,
		email,
		serialized,
	); err != nil {
		return 0, err
	}

	return jobID, nil
}