// 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 License 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 License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package models

import (
	"code.vikunja.io/api/pkg/events"
	user2 "code.vikunja.io/api/pkg/user"
	"code.vikunja.io/api/pkg/web"

	"xorm.io/xorm"
)

// Create implements the create method to assign a user to a team
// @Summary Add a user to a team
// @Description Add a user to a team.
// @tags team
// @Accept json
// @Produce json
// @Security JWTKeyAuth
// @Param id path int true "Team ID"
// @Param team body models.TeamMember true "The user to be added to a team."
// @Success 201 {object} models.TeamMember "The newly created member object"
// @Failure 400 {object} web.HTTPError "Invalid member object provided."
// @Failure 403 {object} web.HTTPError "The user does not have access to the team"
// @Failure 500 {object} models.Message "Internal error"
// @Router /teams/{id}/members [put]
func (tm *TeamMember) Create(s *xorm.Session, a web.Auth) (err error) {

	// Check if the team extst
	team, err := GetTeamByID(s, tm.TeamID)
	if err != nil {
		return err
	}
	// Check if the user exists
	member, err := user2.GetUserByUsername(s, tm.Username)
	if err != nil {
		return
	}
	tm.UserID = member.ID

	// Check if that user is already part of the team
	exists, err := s.
		Where("team_id = ? AND user_id = ?", tm.TeamID, tm.UserID).
		Get(&TeamMember{})
	if err != nil {
		return
	}
	if exists {
		return ErrUserIsMemberOfTeam{tm.TeamID, tm.UserID}
	}

	tm.ID = 0
	_, err = s.Insert(tm)
	if err != nil {
		return err
	}

	events.DispatchOnCommit(s, &TeamMemberAddedEvent{
		Team:   team,
		Member: member,
		Doer:   doerFromAuth(s, a),
	})
	return nil
}

// Delete deletes a user from a team
// @Summary Remove a user from a team
// @Description Remove a user from a team. This will also revoke any access this user might have via that team. A user can remove themselves from the team if they are not the last user in the team.
// @tags team
// @Produce json
// @Security JWTKeyAuth
// @Param id path int true "The ID of the team you want to remove th user from"
// @Param username path int true "The username of the user you want to remove"
// @Success 200 {object} models.Message "The user was successfully removed from the team."
// @Failure 500 {object} models.Message "Internal error"
// @Router /teams/{id}/members/{username} [delete]
func (tm *TeamMember) Delete(s *xorm.Session, a web.Auth) (err error) {

	t, err := GetTeamByID(s, tm.TeamID)
	if err != nil {
		return err
	}

	if t.ExternalID != "" {
		return ErrCannotRemoveUserFromExternalTeam{tm.TeamID}
	}

	total, err := s.Where("team_id = ?", tm.TeamID).Count(&TeamMember{})
	if err != nil {
		return
	}
	if total == 1 {
		return ErrCannotDeleteLastTeamMember{tm.TeamID, tm.UserID}
	}

	// Find the numeric user id
	user, err := user2.GetUserByUsername(s, tm.Username)
	if err != nil && !user2.IsErrUserStatusError(err) {
		return
	}
	tm.UserID = user.ID

	_, err = s.Where("team_id = ? AND user_id = ?", tm.TeamID, tm.UserID).Delete(&TeamMember{})
	if err != nil {
		return err
	}

	doer, _ := user2.GetFromAuth(a)
	events.DispatchOnCommit(s, &TeamMemberRemovedEvent{
		Team:   t,
		Member: user,
		Doer:   doer,
	})
	return nil
}

func (tm *TeamMember) MembershipExists(s *xorm.Session) (exists bool, err error) {
	return s.
		Where("team_id = ? AND user_id = ?", tm.TeamID, tm.UserID).
		Exist(&TeamMember{})
}

// Update toggles a team member's admin status
// @Summary Toggle a team member's admin status
// @Description If a user is team admin, this will make them member and vise-versa.
// @tags team
// @Produce json
// @Security JWTKeyAuth
// @Param id path int true "Team ID"
// @Param userID path int true "User ID"
// @Success 200 {object} models.Message "The member permission was successfully changed."
// @Failure 500 {object} models.Message "Internal error"
// @Router /teams/{id}/members/{userID}/admin [post]
func (tm *TeamMember) Update(s *xorm.Session, _ web.Auth) (err error) {
	// Find the numeric user id
	user, err := user2.GetUserByUsername(s, tm.Username)
	if err != nil && !user2.IsErrUserStatusError(err) {
		return
	}
	tm.UserID = user.ID

	// Get the full member object and change the admin permission
	ttm := &TeamMember{}
	_, err = s.
		Where("team_id = ? AND user_id = ?", tm.TeamID, tm.UserID).
		Get(ttm)
	if err != nil {
		return err
	}
	ttm.Admin = !ttm.Admin

	// Do the update
	_, err = s.
		Where("team_id = ? AND user_id = ?", tm.TeamID, tm.UserID).
		Cols("admin").
		Update(ttm)

	// Carry the persisted row back onto tm so the response has id/created, keeping Username (xorm:"-").
	username := tm.Username
	*tm = *ttm
	tm.Username = username
	return
}