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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.reflect;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.NoSuchElementException;

public class Reflection {

    private Reflection() {
        // no-op
    }

    public static Iterable methods(final Class clazz) {
        return new ArrayList(Arrays.asList(clazz.getMethods()));
    }

    public static Iterable params(final Method method) {
        return new Iterable() {
            @Override
            public Iterator iterator() {
                return new Iterator() {
                    private int index = 0;

                    @Override
                    public boolean hasNext() {
                        return index < method.getParameterTypes().length;
                    }

                    @Override
                    public Parameter next() {
                        if (!hasNext()) throw new NoSuchElementException();

                        return new Parameter(
                                method.getParameterAnnotations()[index],
                                method.getParameterTypes()[index],
                                method.getGenericParameterTypes()[index],
                                index++);
                    }

                    @Override
                    public void remove() {
                        throw new UnsupportedOperationException();
                    }
                };
            }
        };
    }

    public static Iterable params(final Constructor constructor) {
        return new Iterable() {
            @Override
            public Iterator iterator() {
                return new Iterator() {
                    private int index = 0;

                    @Override
                    public boolean hasNext() {
                        return index < constructor.getParameterTypes().length;
                    }

                    @Override
                    public Parameter next() {
                        if (!hasNext()) throw new NoSuchElementException();

                        return new Parameter(
                                constructor.getParameterAnnotations()[index],
                                constructor.getParameterTypes()[index],
                                constructor.getGenericParameterTypes()[index],
                                index++);
                    }

                    @Override
                    public void remove() {
                        throw new UnsupportedOperationException();
                    }
                };
            }
        };
    }
}