// 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/web"
	"xorm.io/xorm"
)

// CanRead implements the read permission check for a link share
func (share *LinkSharing) CanRead(s *xorm.Session, a web.Auth) (bool, int, error) {
	// Don't allow creating link shares if the user itself authenticated with a link share
	if _, is := a.(*LinkSharing); is {
		return false, 0, nil
	}

	// A by-id read carries the parent project but no hash, so resolve the
	// project from ProjectID; only fall back to the hash lookup when ProjectID
	// is absent (e.g. resolving a share purely by its public hash).
	var project *Project
	if share.ProjectID != 0 {
		var err error
		project, err = GetProjectSimpleByID(s, share.ProjectID)
		if err != nil {
			return false, 0, err
		}
	} else {
		var err error
		project, err = GetProjectByShareHash(s, share.Hash)
		if err != nil {
			return false, 0, err
		}
	}
	return project.CanRead(s, a)
}

// CanDelete implements the delete permission check for a link share
func (share *LinkSharing) CanDelete(s *xorm.Session, a web.Auth) (bool, error) {
	return share.canDoLinkShare(s, a)
}

// CanUpdate implements the update permission check for a link share
func (share *LinkSharing) CanUpdate(s *xorm.Session, a web.Auth) (bool, error) {
	return share.canDoLinkShare(s, a)
}

// CanCreate implements the create permission check for a link share
func (share *LinkSharing) CanCreate(s *xorm.Session, a web.Auth) (bool, error) {
	return share.canDoLinkShare(s, a)
}

func (share *LinkSharing) canDoLinkShare(s *xorm.Session, a web.Auth) (bool, error) {
	// Don't allow creating link shares if the user itself authenticated with a link share
	if _, is := a.(*LinkSharing); is {
		return false, nil
	}

	l, err := GetProjectSimpleByID(s, share.ProjectID)
	if err != nil {
		return false, err
	}

	// Check if the user is admin when the link permission is admin
	if share.Permission == PermissionAdmin {
		return l.IsAdmin(s, a)
	}

	return l.CanWrite(s, a)
}