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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();
        }
    }
}