/*
 * 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;

import org.jboss.resteasy.spi.NotFoundException;
import org.jboss.resteasy.spi.ResteasyProviderFactory;
import org.keycloak.common.ClientConnection;
import org.keycloak.events.EventBuilder;
import org.keycloak.models.ClientModel;
import org.keycloak.models.Constants;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.RealmModel;
import org.keycloak.protocol.LoginProtocol;
import org.keycloak.protocol.LoginProtocolFactory;
import org.keycloak.protocol.oidc.OIDCLoginProtocol;
import org.keycloak.protocol.oidc.OIDCLoginProtocolService;
import org.keycloak.services.ServicesLogger;
import org.keycloak.services.clientregistration.ClientRegistrationService;
import org.keycloak.services.managers.RealmManager;
import org.keycloak.services.util.CacheControlUtil;
import org.keycloak.wellknown.WellKnownProvider;

import javax.ws.rs.GET;
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.*;

/**
 * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
 * @version $Revision: 1 $
 */
@Path("/realms")
public class RealmsResource {
    protected static ServicesLogger logger = ServicesLogger.ROOT_LOGGER;

    @Context
    protected KeycloakSession session;

    @Context
    protected ClientConnection clientConnection;

    public static UriBuilder realmBaseUrl(UriInfo uriInfo) {
        UriBuilder baseUriBuilder = uriInfo.getBaseUriBuilder();
        return realmBaseUrl(baseUriBuilder);
    }

    public static UriBuilder realmBaseUrl(UriBuilder baseUriBuilder) {
        return baseUriBuilder.path(RealmsResource.class).path(RealmsResource.class, "getRealmResource");
    }

    public static UriBuilder accountUrl(UriBuilder base) {
        return base.path(RealmsResource.class).path(RealmsResource.class, "getAccountService");
    }

    public static UriBuilder protocolUrl(UriInfo uriInfo) {
        return uriInfo.getBaseUriBuilder().path(RealmsResource.class).path(RealmsResource.class, "getProtocol");
    }

    public static UriBuilder protocolUrl(UriBuilder builder) {
        return builder.path(RealmsResource.class).path(RealmsResource.class, "getProtocol");
    }

    public static UriBuilder clientRegistrationUrl(UriInfo uriInfo) {
        return uriInfo.getBaseUriBuilder().path(RealmsResource.class).path(RealmsResource.class, "getClientsService");
    }

    public static UriBuilder brokerUrl(UriInfo uriInfo) {
        return uriInfo.getBaseUriBuilder().path(RealmsResource.class).path(RealmsResource.class, "getBrokerService");
    }

    @Path("{realm}/login-status-iframe.html")
    @Deprecated
    public Object getLoginStatusIframe(final @PathParam("realm") String name,
                                       @QueryParam("client_id") String client_id,
                                       @QueryParam("origin") String origin) {
        RealmModel realm = init(name);

        EventBuilder event = new EventBuilder(realm, session, clientConnection);

        LoginProtocolFactory factory = (LoginProtocolFactory)session.getKeycloakSessionFactory().getProviderFactory(LoginProtocol.class, OIDCLoginProtocol.LOGIN_PROTOCOL);
        OIDCLoginProtocolService endpoint = (OIDCLoginProtocolService)factory.createProtocolEndpoint(realm, event);

        ResteasyProviderFactory.getInstance().injectProperties(endpoint);
        return endpoint.getLoginStatusIframe();

    }

    @Path("{realm}/protocol/{protocol}")
    public Object getProtocol(final @PathParam("realm") String name,
                                            final @PathParam("protocol") String protocol) {
        RealmModel realm = init(name);

        EventBuilder event = new EventBuilder(realm, session, clientConnection);

        LoginProtocolFactory factory = (LoginProtocolFactory)session.getKeycloakSessionFactory().getProviderFactory(LoginProtocol.class, protocol);
        Object endpoint = factory.createProtocolEndpoint(realm, event);

        ResteasyProviderFactory.getInstance().injectProperties(endpoint);
        return endpoint;
    }

    @Path("{realm}/tokens")
    @Deprecated
    public Object getTokenService(final @PathParam("realm") String name) {
        // for backward compatibility.
        return getProtocol(name, "openid-connect");
    }

    @Path("{realm}/login-actions")
    public LoginActionsService getLoginActionsService(final @PathParam("realm") String name) {
        RealmModel realm = init(name);
        EventBuilder event = new EventBuilder(realm, session, clientConnection);
        LoginActionsService service = new LoginActionsService(realm, event);
        ResteasyProviderFactory.getInstance().injectProperties(service);
        return service;
    }

    @Path("{realm}/clients")
    public ClientRegistrationService getClientsService(final @PathParam("realm") String name) {
        RealmModel realm = init(name);
        EventBuilder event = new EventBuilder(realm, session, clientConnection);
        ClientRegistrationService service = new ClientRegistrationService(event);
        ResteasyProviderFactory.getInstance().injectProperties(service);
        return service;
    }

    @Path("{realm}/clients-managements")
    public ClientsManagementService getClientsManagementService(final @PathParam("realm") String name) {
        RealmModel realm = init(name);
        EventBuilder event = new EventBuilder(realm, session, clientConnection);
        ClientsManagementService service = new ClientsManagementService(realm, event);
        ResteasyProviderFactory.getInstance().injectProperties(service);
        return service;
    }

    private RealmModel init(String realmName) {
        RealmManager realmManager = new RealmManager(session);
        RealmModel realm = realmManager.getRealmByName(realmName);
        if (realm == null) {
            throw new NotFoundException("Realm does not exist");
        }
        session.getContext().setRealm(realm);
        return realm;
    }

    @Path("{realm}/account")
    public AccountService getAccountService(final @PathParam("realm") String name) {
        RealmModel realm = init(name);

        ClientModel client = realm.getClientNameMap().get(Constants.ACCOUNT_MANAGEMENT_CLIENT_ID);
        if (client == null || !client.isEnabled()) {
            logger.debug("account management not enabled");
            throw new NotFoundException("account management not enabled");
        }

        EventBuilder event = new EventBuilder(realm, session, clientConnection);
        AccountService accountService = new AccountService(realm, client, event);
        ResteasyProviderFactory.getInstance().injectProperties(accountService);
        accountService.init();
        return accountService;
    }

    @Path("{realm}")
    public PublicRealmResource getRealmResource(final @PathParam("realm") String name) {
        RealmModel realm = init(name);
        PublicRealmResource realmResource = new PublicRealmResource(realm);
        ResteasyProviderFactory.getInstance().injectProperties(realmResource);
        return realmResource;
    }

    @Path("{realm}/broker")
    public IdentityBrokerService getBrokerService(final @PathParam("realm") String name) {
        RealmModel realm = init(name);

        IdentityBrokerService brokerService = new IdentityBrokerService(realm);
        ResteasyProviderFactory.getInstance().injectProperties(brokerService);

        brokerService.init();

        return brokerService;
    }

    @GET
    @Path("{realm}/.well-known/{provider}")
    @Produces(MediaType.APPLICATION_JSON)
    public Response getWellKnown(final @PathParam("realm") String name,
                              final @PathParam("provider") String providerName) {
        init(name);

        WellKnownProvider wellKnown = session.getProvider(WellKnownProvider.class, providerName);
        return Response.ok(wellKnown.getConfig()).cacheControl(CacheControlUtil.getDefaultCacheControl()).build();
    }

}
