/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.tomcat.buildutil.translate;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

/**
 * Base class providing common implementation for back-port utilities.
 */
public abstract class BackportBase {

    /**
     * Map of source translation properties, keyed by locale.
     */
    protected final Map<String,Properties> sourceTranslations = new HashMap<>();

    /**
     * Map of target translation properties, keyed by locale.
     */
    protected final Map<String,Properties> targetTranslations = new HashMap<>();

    /**
     * Root directory of the target project.
     */
    protected final File targetRoot;

    /**
     * English source properties.
     */
    protected final Properties sourceEnglish;

    /**
     * English target properties.
     */
    protected final Properties targetEnglish;

    /**
     * Directory for storing exported translation files.
     */
    protected final File storageDir;

    /**
     * Constructs a BackportBase instance.
     *
     * @param args array with a single element: the target directory path
     *
     * @throws IOException if an I/O error occurs while reading translation files
     */
    protected BackportBase(String... args) throws IOException {
        if (args.length != 1) {
            throw new IllegalArgumentException("Missing back-port target");
        }
        targetRoot = new File(args[0]);

        if (!targetRoot.isDirectory()) {
            throw new IllegalArgumentException("Back-port target not a directory");
        }

        File sourceRoot = new File(".");
        for (String dir : Constants.SEARCH_DIRS) {
            File directory = new File(dir);
            Utils.processDirectory(sourceRoot, directory, sourceTranslations);
        }

        for (String dir : Constants.SEARCH_DIRS) {
            File directory = new File(targetRoot, dir);
            Utils.processDirectory(targetRoot, directory, targetTranslations);
        }

        sourceEnglish = sourceTranslations.get("");
        targetEnglish = targetTranslations.get("");

        storageDir = new File(targetRoot, Constants.STORAGE_DIR);
    }

    /**
     * Executes the back-port operation.
     *
     * @throws IOException if an I/O error occurs
     */
    protected abstract void execute() throws IOException;
}
