/*
 * 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.camel.quarkus.core.deployment;

import java.io.IOError;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Modifier;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.AbstractMap;
import java.util.HashSet;
import java.util.Properties;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import io.quarkus.deployment.builditem.ApplicationArchivesBuildItem;
import org.apache.camel.quarkus.core.deployment.util.PathFilter;
import org.jboss.jandex.ClassInfo;

public final class CamelSupport {
    public static final String CAMEL_SERVICE_BASE_PATH = "META-INF/services/org/apache/camel";
    public static final String CAMEL_ROOT_PACKAGE_DIRECTORY = "org/apache/camel";

    private CamelSupport() {
    }

    public static boolean isConcrete(ClassInfo ci) {
        return (ci.flags() & Modifier.ABSTRACT) == 0;
    }

    public static boolean isPublic(ClassInfo ci) {
        return (ci.flags() & Modifier.PUBLIC) != 0;
    }

    public static Stream<Path> safeWalk(Path p) {
        try {
            return Files.walk(p);
        } catch (IOException e) {
            throw new IOError(e);
        }
    }

    public static Stream<Path> resources(ApplicationArchivesBuildItem archives, String path) {
        return archives.getAllApplicationArchives().stream()
                .map(arch -> arch.getArchiveRoot().resolve(path))
                .filter(Files::isDirectory)
                .flatMap(CamelSupport::safeWalk)
                .filter(Files::isRegularFile);
    }

    public static Stream<CamelServiceBuildItem> services(ApplicationArchivesBuildItem archives, PathFilter pathFilter) {
        return resources(archives, CAMEL_SERVICE_BASE_PATH)
                .filter(pathFilter.asPathPredicate())
                .map(path -> new AbstractMap.SimpleImmutableEntry<>(path, readProperties(path)))
                .filter(entry -> entry.getValue().getProperty("class") != null)
                .map(entry -> new CamelServiceBuildItem(entry.getKey(), entry.getValue().getProperty("class")));
    }

    private static Properties readProperties(Path path) {
        try (InputStream in = Files.newInputStream(path)) {
            final Properties result = new Properties();
            result.load(in);
            return result;
        } catch (IOException e) {
            throw new RuntimeException("Could not read " + path, e);
        }
    }

    @SafeVarargs
    public static <T> Set<T> setOf(T... items) {
        return Stream.of(items).collect(Collectors.toCollection(HashSet::new));
    }

}