/*
 * 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.exportimport.dir;

import org.jboss.logging.Logger;
import org.keycloak.Config;
import org.keycloak.exportimport.AbstractFileBasedImportProvider;
import org.keycloak.exportimport.Strategy;
import org.keycloak.exportimport.util.ExportImportSessionTask;
import org.keycloak.exportimport.util.ImportUtils;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.KeycloakSessionFactory;
import org.keycloak.models.utils.KeycloakModelUtils;
import org.keycloak.platform.Platform;
import org.keycloak.representations.idm.RealmRepresentation;
import org.keycloak.services.ServicesLogger;
import org.keycloak.util.JsonSerialization;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicBoolean;
import org.keycloak.services.managers.RealmManager;

/**
 * @author <a href="mailto:mposolda@redhat.com">Marek Posolda</a>
 */
public class DirImportProvider extends AbstractFileBasedImportProvider {

    private final Strategy strategy;
    private final KeycloakSessionFactory factory;

    private static final Logger logger = Logger.getLogger(DirImportProvider.class);

    private File rootDirectory;

    private String realmName;

    public DirImportProvider(KeycloakSessionFactory factory, Strategy strategy) {
        this.factory = factory;
        this.strategy = strategy;
    }

    public DirImportProvider withDir(String dir) {
        this.rootDirectory = new File(dir);

        if (!this.rootDirectory.exists()) {
            throw new IllegalStateException("Directory " + this.rootDirectory + " doesn't exist");
        }

        logger.infof("Importing from directory %s", this.rootDirectory.getAbsolutePath());
        return this;
    }

    public DirImportProvider withRealmName(String realmName) {
        this.realmName = realmName;
        return this;
    }

    private File getRootDirectory() {
        if (rootDirectory == null) {
            this.rootDirectory = new File(Platform.getPlatform().getTmpDirectory(), "keycloak-export");
            if (!this.rootDirectory.exists()) {
                throw new IllegalStateException("Directory " + this.rootDirectory + " doesn't exist");
            }

            logger.infof("Importing from directory %s", this.rootDirectory.getAbsolutePath());
        }
        return rootDirectory;
    }

    @Override
    public void importModel() throws IOException {
        if (realmName != null) {
            ServicesLogger.LOGGER.realmImportRequested(realmName, strategy.toString());
            importRealm(realmName, strategy);
        } else {
            ServicesLogger.LOGGER.fullModelImport(strategy.toString());
            List<String> realmNames = getRealmsToImport();

            for (String realmName : realmNames) {
                importRealm(realmName, strategy);
            }
        }
        ServicesLogger.LOGGER.importSuccess();
    }

    @Override
    public boolean isMasterRealmExported() {
        List<String> realmNames = getRealmsToImport();
        return realmNames.contains(Config.getAdminRealm());
    }

    private List<String> getRealmsToImport() {
        File[] realmFiles = getRootDirectory().listFiles((dir, name) -> (name.endsWith("-realm.json")));
        Objects.requireNonNull(realmFiles, "Directory not found: " + getRootDirectory().getName());
        List<String> realmNames = new ArrayList<>();
        for (File file : realmFiles) {
            String fileName = file.getName();
            // Parse "foo" from "foo-realm.json"
            String realmName = fileName.substring(0, fileName.length() - 11);

            // Ensure that master realm is imported first
            if (Config.getAdminRealm().equals(realmName)) {
                realmNames.add(0, realmName);
            } else {
                realmNames.add(realmName);
            }
        }
        return realmNames;
    }

    public void importRealm(final String realmName, final Strategy strategy) throws IOException {
        File realmFile = new File(getRootDirectory() + File.separator + realmName + "-realm.json");
        File[] userFiles = getRootDirectory().listFiles((dir, name) -> name.matches(realmName + "-users-[0-9]+\\.json"));
        Objects.requireNonNull(userFiles, "directory not found: " + getRootDirectory().getName());
        File[] federatedUserFiles = getRootDirectory().listFiles((dir, name) -> name.matches(realmName + "-federated-users-[0-9]+\\.json"));
        Objects.requireNonNull(federatedUserFiles, "directory not found: " + getRootDirectory().getName());

        // Import realm first
        InputStream is = parseFile(realmFile);
        final RealmRepresentation realmRep = JsonSerialization.readValue(is, RealmRepresentation.class);
        final AtomicBoolean realmImported = new AtomicBoolean();

        KeycloakModelUtils.runJobInTransaction(factory, new ExportImportSessionTask() {

            @Override
            public void runExportImportTask(KeycloakSession session) {
                boolean imported = ImportUtils.importRealm(session, realmRep, strategy, true);
                realmImported.set(imported);
            }

        });

        if (realmImported.get()) {
            // Import users
            for (final File userFile : userFiles) {
                try (InputStream fis = parseFile(userFile)) {
                    KeycloakModelUtils.runJobInTransaction(factory, new ExportImportSessionTask() {
                        @Override
                        protected void runExportImportTask(KeycloakSession session) throws IOException {
                            ImportUtils.importUsersFromStream(session, realmName, JsonSerialization.mapper, fis);
                            logger.infof("Imported users from %s", userFile.getAbsolutePath());
                        }
                    });
                }
            }
            for (final File userFile : federatedUserFiles) {
                try (InputStream fis = parseFile(userFile)) {
                    KeycloakModelUtils.runJobInTransaction(factory, new ExportImportSessionTask() {
                        @Override
                        protected void runExportImportTask(KeycloakSession session) throws IOException {
                            ImportUtils.importFederatedUsersFromStream(session, realmName, JsonSerialization.mapper, fis);
                            logger.infof("Imported federated users from %s", userFile.getAbsolutePath());
                        }
                    });
                }
            }
        }

        if (realmImported.get()) {
            // Import authorization and initialize service accounts last, as they require users already in DB
            KeycloakModelUtils.runJobInTransaction(factory, new ExportImportSessionTask() {

                @Override
                public void runExportImportTask(KeycloakSession session) {
                    RealmManager realmManager = new RealmManager(session);
                    realmManager.setupClientServiceAccountsAndAuthorizationOnImport(realmRep, false);
                }

            });
        }
    }

    @Override
    public void close() {

    }
}
