// Copyright Project Harbor Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package admiral

import (
	"github.com/goharbor/harbor/src/common/models"
	"github.com/goharbor/harbor/src/common/rbac"
	"github.com/goharbor/harbor/src/common/rbac/project"
	"github.com/goharbor/harbor/src/common/security/admiral/authcontext"
	"github.com/goharbor/harbor/src/core/promgr"
)

// SecurityContext implements security.Context interface based on
// auth context and project manager
type SecurityContext struct {
	ctx *authcontext.AuthContext
	pm  promgr.ProjectManager
}

// NewSecurityContext ...
func NewSecurityContext(ctx *authcontext.AuthContext, pm promgr.ProjectManager) *SecurityContext {
	return &SecurityContext{
		ctx: ctx,
		pm:  pm,
	}
}

// IsAuthenticated returns true if the user has been authenticated
func (s *SecurityContext) IsAuthenticated() bool {
	if s.ctx == nil {
		return false
	}
	return len(s.ctx.PrincipalID) > 0
}

// GetUsername returns the username of the authenticated user
// It returns null if the user has not been authenticated
func (s *SecurityContext) GetUsername() string {
	if !s.IsAuthenticated() {
		return ""
	}
	return s.ctx.PrincipalID
}

// IsSysAdmin returns whether the authenticated user is system admin
// It returns false if the user has not been authenticated
func (s *SecurityContext) IsSysAdmin() bool {
	if !s.IsAuthenticated() {
		return false
	}

	return s.ctx.IsSysAdmin()
}

// IsSolutionUser ...
func (s *SecurityContext) IsSolutionUser() bool {
	return false
}

// Can returns whether the user can do action on resource
func (s *SecurityContext) Can(action rbac.Action, resource rbac.Resource) bool {
	ns, err := resource.GetNamespace()
	if err == nil {
		switch ns.Kind() {
		case "project":
			projectID := ns.Identity().(int64)
			isPublicProject, _ := s.pm.IsPublic(projectID)
			projectNamespace := rbac.NewProjectNamespace(projectID, isPublicProject)
			user := project.NewUser(s, projectNamespace, s.GetProjectRoles(projectID)...)
			return rbac.HasPermission(user, resource, action)
		}
	}

	return false
}

// GetMyProjects ...
func (s *SecurityContext) GetMyProjects() ([]*models.Project, error) {
	return s.ctx.GetMyProjects(), nil
}

// GetProjectRoles ...
func (s *SecurityContext) GetProjectRoles(projectIDOrName interface{}) []int {
	if !s.IsAuthenticated() || projectIDOrName == nil {
		return []int{}
	}

	return s.ctx.GetProjectRoles(projectIDOrName)
}
