/*
 * 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.theme;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.Locale;
import java.util.Properties;

/**
 * @author <a href="mailto:sthorger@redhat.com">Stian Thorgersen</a>
 */
public class ClassLoaderTheme implements Theme {

    private String name;

    private String parentName;

    private String importName;

    private Type type;

    private ClassLoader classLoader;

    private String templateRoot;

    private String resourceRoot;

    private String messageRoot;

    private Properties properties;

    public ClassLoaderTheme(String name, Type type, ClassLoader classLoader) throws IOException {
        init(name, type, classLoader);
    }

    public void init(String name, Type type, ClassLoader classLoader) throws IOException {
        this.name = name;
        this.type = type;
        this.classLoader = classLoader;

        String themeRoot = "theme/" + name + "/" + type.toString().toLowerCase() + "/";

        this.templateRoot = themeRoot;
        this.resourceRoot = themeRoot + "resources/";
        this.messageRoot = themeRoot + "messages/";
        this.properties = new Properties();

        URL p = classLoader.getResource(themeRoot + "theme.properties");
        if (p != null) {
            Charset encoding = PropertiesUtil.detectEncoding(p.openStream());
            try (Reader reader = new InputStreamReader(p.openStream(), encoding)) {
                properties.load(reader);
            }
            this.parentName = properties.getProperty("parent");
            this.importName = properties.getProperty("import");
        } else {
            this.parentName = null;
            this.importName = null;
        }
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public String getParentName() {
        return parentName;
    }

    @Override
    public String getImportName() {
        return importName;
    }

    @Override
    public Type getType() {
        return type;
    }

    @Override
    public URL getTemplate(String name) {
        return classLoader.getResource(templateRoot + name);
    }

    @Override
    public InputStream getResourceAsStream(String path) throws IOException {
        final URL rootResourceURL = classLoader.getResource(resourceRoot);
        if (rootResourceURL == null) {
            return null;
        }
        String rootPath = rootResourceURL.getPath();

        if (rootPath.endsWith("//")) {
            // needed for asset loading in quarkus IDELauncher - see gh issue #9942
            rootPath = rootPath.substring(0, rootPath.length() -1);
        }

        final URL resourceURL = classLoader.getResource(resourceRoot + path);
        if(resourceURL == null || !resourceURL.getPath().startsWith(rootPath)) {
            return null;
        }
        else {
            return resourceURL.openConnection().getInputStream();
        }
    }

    @Override
    public Properties getMessages(Locale locale) throws IOException {
        return getMessages("messages", locale);
    }

    @Override
    public Properties getMessages(String baseBundlename, Locale locale) throws IOException {
        if(locale == null){
            return null;
        }
        Properties m = new Properties();

        URL url = classLoader.getResource(this.messageRoot + baseBundlename + "_" + locale.toString() + ".properties");
        if (url != null) {
            Charset encoding = PropertiesUtil.detectEncoding(url.openStream());
            try (Reader reader = new InputStreamReader(url.openStream(), encoding)) {
                m.load(reader);
            }
        }
        return m;
    }

    @Override
    public Properties getProperties() {
        return properties;
    }

}
