/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * 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 org.keycloak.services.resources.admin;

import org.jboss.logging.Logger;
import org.jboss.resteasy.annotations.cache.NoCache;
import javax.ws.rs.NotFoundException;
import org.keycloak.events.admin.OperationType;
import org.keycloak.events.admin.ResourceType;
import org.keycloak.models.ClientModel;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.RealmModel;
import org.keycloak.models.RoleModel;
import org.keycloak.models.utils.ModelToRepresentation;
import org.keycloak.representations.idm.ManagementPermissionReference;
import org.keycloak.representations.idm.RoleRepresentation;
import org.keycloak.services.ErrorResponse;
import org.keycloak.services.ErrorResponseException;
import org.keycloak.services.resources.admin.permissions.AdminPermissionEvaluator;
import org.keycloak.services.resources.admin.permissions.AdminPermissionManagement;
import org.keycloak.services.resources.admin.permissions.AdminPermissions;

import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.util.List;
import java.util.stream.Stream;

/**
 * Sometimes its easier to just interact with roles by their ID instead of container/role-name
 *
 * @resource Roles (by ID)
 * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
 * @version $Revision: 1 $
 */
public class RoleByIdResource extends RoleResource {
    protected static final Logger logger = Logger.getLogger(RoleByIdResource.class);
    private final RealmModel realm;
    private AdminPermissionEvaluator auth;
    private AdminEventBuilder adminEvent;

    @Context
    private KeycloakSession session;

    public RoleByIdResource(RealmModel realm, AdminPermissionEvaluator auth, AdminEventBuilder adminEvent) {
        super(realm);

        this.realm = realm;
        this.auth = auth;
        this.adminEvent = adminEvent;
    }

    /**
     * Get a specific role's representation
     *
     * @param id id of role
     * @return
     */
    @Path("{role-id}")
    @GET
    @NoCache
    @Produces(MediaType.APPLICATION_JSON)
    public RoleRepresentation getRole(final @PathParam("role-id") String id) {

        RoleModel roleModel = getRoleModel(id);
        auth.roles().requireView(roleModel);
        return getRole(roleModel);
    }

    protected RoleModel getRoleModel(String id) {
        RoleModel roleModel = realm.getRoleById(id);
        if (roleModel == null) {
            throw new NotFoundException("Could not find role with id");
        }
       return roleModel;
    }

    /**
     * Delete the role
     *
     * @param id id of role
     */
    @Path("{role-id}")
    @DELETE
    @NoCache
    public void deleteRole(final @PathParam("role-id") String id) {
        if (realm.getDefaultRole() == null) {
            logger.warnf("Default role for realm with id '%s' doesn't exist.", realm.getId());
        } else if (realm.getDefaultRole().getId().equals(id)) {
            throw new ErrorResponseException(ErrorResponse.error(realm.getDefaultRole().getName() + " is default role of the realm and cannot be removed.", 
                    Response.Status.BAD_REQUEST));
        }

        RoleModel role = getRoleModel(id);
        auth.roles().requireManage(role);
        deleteRole(role);

        if (role.isClientRole()) {
            adminEvent.resource(ResourceType.CLIENT_ROLE);
        } else {
            adminEvent.resource(ResourceType.REALM_ROLE);
        }

        adminEvent.operation(OperationType.DELETE).resourcePath(session.getContext().getUri()).success();
    }

    /**
     * Update the role
     *
     * @param id id of role
     * @param rep
     */
    @Path("{role-id}")
    @PUT
    @Consumes(MediaType.APPLICATION_JSON)
    public void updateRole(final @PathParam("role-id") String id, final RoleRepresentation rep) {
        RoleModel role = getRoleModel(id);
        auth.roles().requireManage(role);
        updateRole(rep, role);

        if (role.isClientRole()) {
            adminEvent.resource(ResourceType.CLIENT_ROLE);
        } else {
            adminEvent.resource(ResourceType.REALM_ROLE);
        }

        adminEvent.operation(OperationType.UPDATE).resourcePath(session.getContext().getUri()).representation(rep).success();
    }

    /**
     * Make the role a composite role by associating some child roles
     *
     * @param id
     * @param roles
     */
    @Path("{role-id}/composites")
    @POST
    @Consumes(MediaType.APPLICATION_JSON)
    public void addComposites(final @PathParam("role-id") String id, List<RoleRepresentation> roles) {
        RoleModel role = getRoleModel(id);
        auth.roles().requireManage(role);
        addComposites(auth, adminEvent, session.getContext().getUri(), roles, role);
    }

    /**
     * Get role's children
     *
     * Returns a set of role's children provided the role is a composite.
     *
     * @param id
     * @return
     */
    @Path("{role-id}/composites")
    @GET
    @NoCache
    @Produces(MediaType.APPLICATION_JSON)
    public Stream<RoleRepresentation> getRoleComposites(final @PathParam("role-id") String id,
                                                        final @QueryParam("search") String search,
                                                        final @QueryParam("first") Integer first,
                                                        final @QueryParam("max") Integer max
    ) {

        if (logger.isDebugEnabled()) logger.debug("*** getRoleComposites: '" + id + "'");
        RoleModel role = getRoleModel(id);
        auth.roles().requireView(role);

        if (search == null && first == null && max == null) {
            return role.getCompositesStream().map(ModelToRepresentation::toBriefRepresentation);
        }

        return role.getCompositesStream(search, first, max).map(ModelToRepresentation::toBriefRepresentation);
    }

    /**
     * Get realm-level roles that are in the role's composite
     *
     * @param id
     * @return
     */
    @Path("{role-id}/composites/realm")
    @GET
    @NoCache
    @Produces(MediaType.APPLICATION_JSON)
    public Stream<RoleRepresentation> getRealmRoleComposites(final @PathParam("role-id") String id) {
        RoleModel role = getRoleModel(id);
        auth.roles().requireView(role);
        return getRealmRoleComposites(role);
    }

    /**
     * Get client-level roles for the client that are in the role's composite
     *
     * @param id
     * @param clientUuid
     * @return
     */
    @Path("{role-id}/composites/clients/{clientUuid}")
    @GET
    @NoCache
    @Produces(MediaType.APPLICATION_JSON)
    public Stream<RoleRepresentation> getClientRoleComposites(final @PathParam("role-id") String id,
                                                                final @PathParam("clientUuid") String clientUuid) {

        RoleModel role = getRoleModel(id);
        auth.roles().requireView(role);
        ClientModel clientModel = realm.getClientById(clientUuid);
        if (clientModel == null) {
            throw new NotFoundException("Could not find client");
        }
        return getClientRoleComposites(clientModel, role);
    }

    /**
     * Remove a set of roles from the role's composite
     *
     * @param id Role id
     * @param roles A set of roles to be removed
     */
    @Path("{role-id}/composites")
    @DELETE
    @Consumes(MediaType.APPLICATION_JSON)
    public void deleteComposites(final @PathParam("role-id") String id, List<RoleRepresentation> roles) {
        RoleModel role = getRoleModel(id);
        auth.roles().requireManage(role);
        deleteComposites(adminEvent, session.getContext().getUri(), roles, role);
    }

    /**
     * Return object stating whether role Authoirzation permissions have been initialized or not and a reference
     *
     *
     * @param id
     * @return
     */
    @Path("{role-id}/management/permissions")
    @GET
    @Produces(MediaType.APPLICATION_JSON)
    @NoCache
    public ManagementPermissionReference getManagementPermissions(final @PathParam("role-id") String id) {
        RoleModel role = getRoleModel(id);
        auth.roles().requireView(role);

        AdminPermissionManagement permissions = AdminPermissions.management(session, realm);
        if (!permissions.roles().isPermissionsEnabled(role)) {
            return new ManagementPermissionReference();
        }
        return toMgmtRef(role, permissions);
    }

    public static ManagementPermissionReference toMgmtRef(RoleModel role, AdminPermissionManagement permissions) {
        ManagementPermissionReference ref = new ManagementPermissionReference();
        ref.setEnabled(true);
        ref.setResource(permissions.roles().resource(role).getId());
        ref.setScopePermissions(permissions.roles().getPermissions(role));
        return ref;
    }

    /**
     * Return object stating whether role Authoirzation permissions have been initialized or not and a reference
     *
     *
     * @param id
     * @return initialized manage permissions reference
     */
    @Path("{role-id}/management/permissions")
    @PUT
    @Produces(MediaType.APPLICATION_JSON)
    @Consumes(MediaType.APPLICATION_JSON)
    @NoCache
    public ManagementPermissionReference setManagementPermissionsEnabled(final @PathParam("role-id") String id, ManagementPermissionReference ref) {
        RoleModel role = getRoleModel(id);
        auth.roles().requireManage(role);

        AdminPermissionManagement permissions = AdminPermissions.management(session, realm);
        permissions.roles().setPermissionsEnabled(role, ref.isEnabled());
        if (ref.isEnabled()) {
            return toMgmtRef(role, permissions);
        } else {
            return new ManagementPermissionReference();
        }
    }

}
