/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package handler

import (
	"errors"
	"fmt"

	"github.com/apache/shardingsphere-on-cloud/pitr/agent/internal/cons"
	"github.com/apache/shardingsphere-on-cloud/pitr/agent/internal/handler/view"
	"github.com/apache/shardingsphere-on-cloud/pitr/agent/internal/pkg"
	"github.com/apache/shardingsphere-on-cloud/pitr/agent/pkg/responder"

	"github.com/gofiber/fiber/v2"
)

func Backup(ctx *fiber.Ctx) error {
	in := &view.BackupIn{}

	if err := ctx.BodyParser(in); err != nil {
		return fmt.Errorf("body parse err: %s, wrap: %w", err, cons.BodyParseFailed)
	}

	if err := in.Validate(); err != nil {
		return fmt.Errorf("invalid parameter, err wrap: %w", err)
	}

	if err := pkg.OG.Auth(in.Username, in.Password, in.DBName, in.DBPort); err != nil {
		efmt := "pkg.OG.Auth failure[un=%s,pw.len=%d,db=%s], err wrap=%w"
		return fmt.Errorf(efmt, in.Username, len(in.Password), in.DBName, err)
	}

	if err := pkg.OG.Init(in.DnBackupPath); err != nil {
		return fmt.Errorf("init instance failed, err: %w", err)
	}

	// try to add backup instance
	if err := pkg.OG.AddInstance(in.DnBackupPath, in.Instance); err != nil && !errors.Is(err, cons.InstanceAlreadyExist) {
		return fmt.Errorf("add instance failed, err wrap: %w", err)
	}

	backupID, err := pkg.OG.AsyncBackup(in.DnBackupPath, in.Instance, in.DnBackupMode, in.DnThreadsNum, in.DBPort)
	if err != nil {
		efmt := "pkg.OG.AsyncBackup[path=%s,instance=%s,mode=%s] failure, err wrap: %w"
		return fmt.Errorf(efmt, in.DnBackupPath, in.Instance, in.DnBackupMode, err)
	}

	return responder.Success(ctx, view.BackupOut{
		ID: backupID,
	})
}

func DeleteBackup(ctx *fiber.Ctx) error {
	in := &view.DeleteBackupIn{}
	if err := ctx.BodyParser(in); err != nil {
		return fmt.Errorf("body parse err: %s, wrap: %w", err, cons.BodyParseFailed)
	}

	if err := in.Validate(); err != nil {
		return fmt.Errorf("invalid parameter, err: %w", err)
	}

	if err := pkg.OG.Auth(in.Username, in.Password, in.DBName, in.DBPort); err != nil {
		efmt := "pkg.OG.Auth failure[un=%s,pw.len=%d,db=%s], err: %w"
		return fmt.Errorf(efmt, in.Username, len(in.Password), in.DBName, err)
	}

	if err := pkg.OG.DelBackup(in.DnBackupPath, in.Instance, in.BackupID); err != nil {
		return fmt.Errorf("delete backup failure, err: %w", err)
	}

	return responder.Success(ctx, "")
}