// Vikunja is a to-do list application to facilitate your life.
// Copyright 2018-present Vikunja and contributors. All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public Licensee as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public Licensee for more details.
//
// You should have received a copy of the GNU Affero General Public Licensee
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package migration

import (
	"math"

	"src.techknowlogick.com/xormigrate"
	"xorm.io/xorm"
)

type tasks20210725153703 struct {
	ID             int64   `xorm:"bigint autoincr not null" json:"id" param:"listtask"`
	Position       float64 `xorm:"double null" json:"position"`
	KanbanPosition float64 `xorm:"double null" json:"kanban_position"`
}

func (tasks20210725153703) TableName() string {
	return "tasks"
}

func init() {
	migrations = append(migrations, &xormigrate.Migration{
		ID:          "20210725153703",
		Description: "",
		Migrate: func(tx *xorm.Engine) error {
			err := tx.Sync2(tasks20210725153703{})
			if err != nil {
				return err
			}

			tasks := []*tasks20210725153703{}
			err = tx.Where("position is not null").Find(&tasks)
			if err != nil {
				return err
			}

			// Migrate all old kanban positions to the kanban positions property
			for _, task := range tasks {
				task.KanbanPosition = task.Position
				task.Position = float64(task.ID) * math.Pow(2, 16)
				_, err = tx.
					Where("id = ?", task.ID).
					Cols("kanban_position", "position").
					Update(task)
				if err != nil {
					return err
				}
			}

			return nil
		},
		Rollback: func(tx *xorm.Engine) error {
			return nil
		},
	})
}