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/**
 * 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.tomitribe.util;

import java.io.File;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

public class Join {

    private Join() {
        // no-op
    }

    public static final MethodCallback METHOD_CALLBACK = new MethodCallback();

    public static final ClassCallback CLASS_CALLBACK = new ClassCallback();

    public static String join(final String delimiter, final Collection collection) {
        if (collection.size() == 0) return "";

        final StringBuilder sb = new StringBuilder();

        for (final Object obj : collection) {
            sb.append(obj).append(delimiter);
        }

        return sb.substring(0, sb.length() - delimiter.length());
    }

    public static String join(final String delimiter, final Object... collection) {
        if (collection.length == 0) return "";

        final StringBuilder sb = new StringBuilder();

        for (final Object obj : collection) {
            sb.append(obj).append(delimiter);
        }

        return sb.substring(0, sb.length() - delimiter.length());
    }

    public static  String join(final String delimiter, final NameCallback nameCallback, final T... collection) {
        if (collection.length == 0) return "";

        final StringBuilder sb = new StringBuilder();

        for (final T obj : collection) {
            sb.append(nameCallback.getName(obj)).append(delimiter);
        }

        return sb.substring(0, sb.length() - delimiter.length());
    }

    public static  String join(final String delimiter, final NameCallback nameCallback, final Collection collection) {
        if (collection.size() == 0) return "";

        final StringBuilder sb = new StringBuilder();

        for (final T obj : collection) {
            sb.append(nameCallback.getName(obj)).append(delimiter);
        }

        return sb.substring(0, sb.length() - delimiter.length());
    }

    public static  List strings(final Collection collection, final NameCallback callback) {
        final List list = new ArrayList();

        for (final T t : collection) {
            final String name = callback.getName(t);
            list.add(name);
        }

        return list;
    }

    public interface NameCallback {

        String getName(T object);
    }

    public static class FileCallback implements NameCallback {

        public String getName(final File file) {
            return file.getName();
        }
    }

    public static class MethodCallback implements NameCallback {

        public String getName(final Method method) {
            return method.getName();
        }
    }

    public static class ClassCallback implements NameCallback> {

        public String getName(final Class cls) {
            return cls.getName();
        }
    }
}