// 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 v1

import (
	"net/http"

	"code.vikunja.io/api/pkg/db"

	"code.vikunja.io/api/pkg/models"
	"code.vikunja.io/api/pkg/user"
	"code.vikunja.io/web/handler"
	"github.com/labstack/echo/v4"
)

// UserPassword holds a user password. Used to update it.
type UserPassword struct {
	OldPassword string `json:"old_password"`
	NewPassword string `json:"new_password"`
}

// UserChangePassword is the handler to change a users password
// @Summary Change password
// @Description Lets the current user change its password.
// @tags user
// @Accept json
// @Produce json
// @Param userPassword body v1.UserPassword true "The current and new password."
// @Security JWTKeyAuth
// @Success 200 {object} models.Message
// @Failure 400 {object} web.HTTPError "Something's invalid."
// @Failure 404 {object} web.HTTPError "User does not exist."
// @Failure 500 {object} models.Message "Internal server error."
// @Router /user/password [post]
func UserChangePassword(c echo.Context) error {
	// Check if the user is itself
	doer, err := user.GetCurrentUser(c)
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, "Error getting current user.")
	}

	// Check for Request Content
	var newPW UserPassword
	if err := c.Bind(&newPW); err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "No password provided.")
	}

	if newPW.OldPassword == "" {
		return handler.HandleHTTPError(user.ErrEmptyOldPassword{}, c)
	}

	s := db.NewSession()
	defer s.Close()

	// Check the current password
	if _, err = user.CheckUserCredentials(s, &user.Login{Username: doer.Username, Password: newPW.OldPassword}); err != nil {
		_ = s.Rollback()
		return handler.HandleHTTPError(err, c)
	}

	// Update the password
	if err = user.UpdateUserPassword(s, doer, newPW.NewPassword); err != nil {
		_ = s.Rollback()
		return handler.HandleHTTPError(err, c)
	}

	if err := s.Commit(); err != nil {
		_ = s.Rollback()
		return handler.HandleHTTPError(err, c)
	}

	return c.JSON(http.StatusOK, models.Message{Message: "The password was updated successfully."})
}
