/*
 * 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.maven.surefire.api.util;

import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import org.apache.maven.surefire.api.filter.SpecificTestClassFilter;

/**
 * Scans directories looking for tests.
 *
 * @author Karl M. Davis
 * @author Kristian Rosenvold
 */
@Deprecated
public class DefaultDirectoryScanner implements DirectoryScanner {

    private static final String FS = System.getProperty("file.separator");

    private static final String[] EMPTY_STRING_ARRAY = new String[0];

    private static final String JAVA_SOURCE_FILE_EXTENSION = ".java";

    private static final String JAVA_CLASS_FILE_EXTENSION = ".class";

    private final File basedir;

    private final List<String> includes;

    private final List<String> excludes;

    private final List<String> specificTests;

    public DefaultDirectoryScanner(
            File basedir, List<String> includes, List<String> excludes, List<String> specificTests) {
        this.basedir = basedir;
        this.includes = includes;
        this.excludes = excludes;
        this.specificTests = specificTests;
    }

    @Override
    public TestsToRun locateTestClasses(ClassLoader classLoader, ScannerFilter scannerFilter) {
        String[] testClassNames = collectTests();
        Set<Class<?>> result = new LinkedHashSet<>();

        String[] specific = specificTests == null ? new String[0] : processIncludesExcludes(specificTests);
        SpecificTestClassFilter specificTestFilter = new SpecificTestClassFilter(specific);

        for (String className : testClassNames) {
            Class<?> testClass = loadClass(classLoader, className);

            if (!specificTestFilter.accept(testClass)) {
                // FIXME: Log this somehow!
                continue;
            }

            if (scannerFilter == null || scannerFilter.accept(testClass)) {
                result.add(testClass);
            }
        }

        return new TestsToRun(result);
    }

    private static Class<?> loadClass(ClassLoader classLoader, String className) {
        try {
            return classLoader.loadClass(className);
        } catch (ClassNotFoundException e) {
            throw new RuntimeException("Unable to create test class '" + className + "'", e);
        }
    }

    String[] collectTests() {
        String[] tests = EMPTY_STRING_ARRAY;
        if (basedir.exists()) {
            org.apache.maven.surefire.shared.utils.io.DirectoryScanner scanner =
                    new org.apache.maven.surefire.shared.utils.io.DirectoryScanner();

            scanner.setBasedir(basedir);

            if (includes != null) {
                scanner.setIncludes(processIncludesExcludes(includes));
            }

            if (excludes != null) {
                scanner.setExcludes(processIncludesExcludes(excludes));
            }

            scanner.scan();

            tests = scanner.getIncludedFiles();
            for (int i = 0; i < tests.length; i++) {
                String test = tests[i];
                test = test.substring(0, test.indexOf("."));
                tests[i] = test.replace(FS.charAt(0), '.');
            }
        }
        return tests;
    }

    private static String[] processIncludesExcludes(List<String> list) {
        List<String> newList = new ArrayList<>();
        for (String include : list) {
            String[] includes = include.split(",");
            Collections.addAll(newList, includes);
        }

        String[] incs = new String[newList.size()];

        for (int i = 0; i < incs.length; i++) {
            String inc = newList.get(i);
            if (inc.endsWith(JAVA_SOURCE_FILE_EXTENSION)) {
                inc = inc.substring(0, inc.lastIndexOf(JAVA_SOURCE_FILE_EXTENSION)) + JAVA_CLASS_FILE_EXTENSION;
            }
            incs[i] = inc;
        }
        return incs;
    }
}
