/*
 * 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.plugins.clean;

/*
 * 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.
 */

import java.io.File;
import java.util.Arrays;
import org.apache.maven.shared.utils.io.DirectoryScanner;
import org.apache.maven.shared.utils.io.SelectorUtils;

/**
 * Selects paths based on Ant-like glob patterns.
 *
 * @author Benjamin Bentmann
 */
class GlobSelector implements Selector {

    private final String[] includes;

    private final String[] excludes;

    private final String str;

    GlobSelector(String[] includes, String[] excludes) {
        this(includes, excludes, false);
    }

    GlobSelector(String[] includes, String[] excludes, boolean useDefaultExcludes) {
        this.str = "includes = " + toString(includes) + ", excludes = " + toString(excludes);
        this.includes = normalizePatterns(includes);
        this.excludes = normalizePatterns(addDefaultExcludes(excludes, useDefaultExcludes));
    }

    private static String toString(String[] patterns) {
        return (patterns == null) ? "[]" : Arrays.asList(patterns).toString();
    }

    private static String[] addDefaultExcludes(String[] excludes, boolean useDefaultExcludes) {
        String[] defaults = DirectoryScanner.DEFAULTEXCLUDES;
        if (!useDefaultExcludes) {
            return excludes;
        } else if (excludes == null || excludes.length <= 0) {
            return defaults;
        } else {
            String[] patterns = new String[excludes.length + defaults.length];
            System.arraycopy(excludes, 0, patterns, 0, excludes.length);
            System.arraycopy(defaults, 0, patterns, excludes.length, defaults.length);
            return patterns;
        }
    }

    private static String[] normalizePatterns(String[] patterns) {
        String[] normalized;

        if (patterns != null) {
            normalized = new String[patterns.length];
            for (int i = patterns.length - 1; i >= 0; i--) {
                normalized[i] = normalizePattern(patterns[i]);
            }
        } else {
            normalized = new String[0];
        }

        return normalized;
    }

    private static String normalizePattern(String pattern) {
        if (pattern == null) {
            return "";
        }

        String normalized = pattern.replace((File.separatorChar == '/') ? '\\' : '/', File.separatorChar);

        if (normalized.endsWith(File.separator)) {
            normalized += "**";
        }

        return normalized;
    }

    public boolean isSelected(String pathname) {
        return (includes.length <= 0 || isMatched(pathname, includes))
                && (excludes.length <= 0 || !isMatched(pathname, excludes));
    }

    private static boolean isMatched(String pathname, String[] patterns) {
        for (String pattern : patterns) {
            if (SelectorUtils.matchPath(pattern, pathname)) {
                return true;
            }
        }
        return false;
    }

    public boolean couldHoldSelected(String pathname) {
        for (String include : includes) {
            if (SelectorUtils.matchPatternStart(include, pathname)) {
                return true;
            }
        }
        return includes.length <= 0;
    }

    public String toString() {
        return str;
    }
}