// Vikunja is a to-do list application to facilitate your life.
// Copyright 2018-2021 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 models

import (
	"time"

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

	"code.vikunja.io/web"
	"xorm.io/xorm"
)

// TeamList defines the relation between a team and a list
type TeamList struct {
	// The unique, numeric id of this list <-> team relation.
	ID int64 `xorm:"bigint autoincr not null unique pk" json:"id"`
	// The team id.
	TeamID int64 `xorm:"bigint not null INDEX" json:"team_id" param:"team"`
	// The list id.
	ListID int64 `xorm:"bigint not null INDEX" json:"-" param:"list"`
	// The right this team has. 0 = Read only, 1 = Read & Write, 2 = Admin. See the docs for more details.
	Right Right `xorm:"bigint INDEX not null default 0" json:"right" valid:"length(0|2)" maximum:"2" default:"0"`

	// A timestamp when this relation was created. You cannot change this value.
	Created time.Time `xorm:"created not null" json:"created"`
	// A timestamp when this relation was last updated. You cannot change this value.
	Updated time.Time `xorm:"updated not null" json:"updated"`

	web.CRUDable `xorm:"-" json:"-"`
	web.Rights   `xorm:"-" json:"-"`
}

// TableName makes beautiful table names
func (TeamList) TableName() string {
	return "team_lists"
}

// TeamWithRight represents a team, combined with rights.
type TeamWithRight struct {
	Team  `xorm:"extends"`
	Right Right `json:"right"`
}

// Create creates a new team <-> list relation
// @Summary Add a team to a list
// @Description Gives a team access to a list.
// @tags sharing
// @Accept json
// @Produce json
// @Security JWTKeyAuth
// @Param id path int true "List ID"
// @Param list body models.TeamList true "The team you want to add to the list."
// @Success 200 {object} models.TeamList "The created team<->list relation."
// @Failure 400 {object} web.HTTPError "Invalid team list object provided."
// @Failure 404 {object} web.HTTPError "The team does not exist."
// @Failure 403 {object} web.HTTPError "The user does not have access to the list"
// @Failure 500 {object} models.Message "Internal error"
// @Router /lists/{id}/teams [put]
func (tl *TeamList) Create(s *xorm.Session, a web.Auth) (err error) {

	// Check if the rights are valid
	if err = tl.Right.isValid(); err != nil {
		return
	}

	// Check if the team exists
	team, err := GetTeamByID(s, tl.TeamID)
	if err != nil {
		return err
	}

	// Check if the list exists
	l, err := GetListSimpleByID(s, tl.ListID)
	if err != nil {
		return err
	}

	// Check if the team is already on the list
	exists, err := s.Where("team_id = ?", tl.TeamID).
		And("list_id = ?", tl.ListID).
		Get(&TeamList{})
	if err != nil {
		return
	}
	if exists {
		return ErrTeamAlreadyHasAccess{tl.TeamID, tl.ListID}
	}

	// Insert the new team
	_, err = s.Insert(tl)
	if err != nil {
		return err
	}

	err = events.Dispatch(&ListSharedWithTeamEvent{
		List: l,
		Team: team,
		Doer: a,
	})
	if err != nil {
		return err
	}

	err = updateListLastUpdated(s, l)
	return
}

// Delete deletes a team <-> list relation based on the list & team id
// @Summary Delete a team from a list
// @Description Delets a team from a list. The team won't have access to the list anymore.
// @tags sharing
// @Produce json
// @Security JWTKeyAuth
// @Param listID path int true "List ID"
// @Param teamID path int true "Team ID"
// @Success 200 {object} models.Message "The team was successfully deleted."
// @Failure 403 {object} web.HTTPError "The user does not have access to the list"
// @Failure 404 {object} web.HTTPError "Team or list does not exist."
// @Failure 500 {object} models.Message "Internal error"
// @Router /lists/{listID}/teams/{teamID} [delete]
func (tl *TeamList) Delete(s *xorm.Session, a web.Auth) (err error) {

	// Check if the team exists
	_, err = GetTeamByID(s, tl.TeamID)
	if err != nil {
		return
	}

	// Check if the team has access to the list
	has, err := s.
		Where("team_id = ? AND list_id = ?", tl.TeamID, tl.ListID).
		Get(&TeamList{})
	if err != nil {
		return
	}
	if !has {
		return ErrTeamDoesNotHaveAccessToList{TeamID: tl.TeamID, ListID: tl.ListID}
	}

	// Delete the relation
	_, err = s.Where("team_id = ?", tl.TeamID).
		And("list_id = ?", tl.ListID).
		Delete(TeamList{})
	if err != nil {
		return err
	}

	err = updateListLastUpdated(s, &List{ID: tl.ListID})
	return
}

// ReadAll implements the method to read all teams of a list
// @Summary Get teams on a list
// @Description Returns a list with all teams which have access on a given list.
// @tags sharing
// @Accept json
// @Produce json
// @Param id path int true "List ID"
// @Param page query int false "The page number. Used for pagination. If not provided, the first page of results is returned."
// @Param per_page query int false "The maximum number of items per page. Note this parameter is limited by the configured maximum of items per page."
// @Param s query string false "Search teams by its name."
// @Security JWTKeyAuth
// @Success 200 {array} models.TeamWithRight "The teams with their right."
// @Failure 403 {object} web.HTTPError "No right to see the list."
// @Failure 500 {object} models.Message "Internal error"
// @Router /lists/{id}/teams [get]
func (tl *TeamList) ReadAll(s *xorm.Session, a web.Auth, search string, page int, perPage int) (result interface{}, resultCount int, totalItems int64, err error) {
	// Check if the user can read the namespace
	l := &List{ID: tl.ListID}
	canRead, _, err := l.CanRead(s, a)
	if err != nil {
		return nil, 0, 0, err
	}
	if !canRead {
		return nil, 0, 0, ErrNeedToHaveListReadAccess{ListID: tl.ListID, UserID: a.GetID()}
	}

	limit, start := getLimitFromPageIndex(page, perPage)

	// Get the teams
	all := []*TeamWithRight{}
	query := s.
		Table("teams").
		Join("INNER", "team_lists", "team_id = teams.id").
		Where("team_lists.list_id = ?", tl.ListID).
		Where("teams.name LIKE ?", "%"+search+"%")
	if limit > 0 {
		query = query.Limit(limit, start)
	}
	err = query.Find(&all)
	if err != nil {
		return nil, 0, 0, err
	}

	teams := []*Team{}
	for _, t := range all {
		teams = append(teams, &t.Team)
	}

	err = addMoreInfoToTeams(s, teams)
	if err != nil {
		return
	}

	totalItems, err = s.
		Table("teams").
		Join("INNER", "team_lists", "team_id = teams.id").
		Where("team_lists.list_id = ?", tl.ListID).
		Where("teams.name LIKE ?", "%"+search+"%").
		Count(&TeamWithRight{})
	if err != nil {
		return nil, 0, 0, err
	}

	return all, len(all), totalItems, err
}

// Update updates a team <-> list relation
// @Summary Update a team <-> list relation
// @Description Update a team <-> list relation. Mostly used to update the right that team has.
// @tags sharing
// @Accept json
// @Produce json
// @Param listID path int true "List ID"
// @Param teamID path int true "Team ID"
// @Param list body models.TeamList true "The team you want to update."
// @Security JWTKeyAuth
// @Success 200 {object} models.TeamList "The updated team <-> list relation."
// @Failure 403 {object} web.HTTPError "The user does not have admin-access to the list"
// @Failure 404 {object} web.HTTPError "Team or list does not exist."
// @Failure 500 {object} models.Message "Internal error"
// @Router /lists/{listID}/teams/{teamID} [post]
func (tl *TeamList) Update(s *xorm.Session, a web.Auth) (err error) {

	// Check if the right is valid
	if err := tl.Right.isValid(); err != nil {
		return err
	}

	_, err = s.
		Where("list_id = ? AND team_id = ?", tl.ListID, tl.TeamID).
		Cols("right").
		Update(tl)
	if err != nil {
		return err
	}

	err = updateListLastUpdated(s, &List{ID: tl.ListID})
	return
}