/*****************************************************************
 *   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.cayenne.di;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

/**
 * @since 4.0
 */
class TypeLiteral<T> {

    final Class<? super T> type;
    final String typeName;
    final String[] argumentsType;

    static <T> TypeLiteral<T> of(Class<T> type) {
        return new TypeLiteral<>(type);
    }

    static <T> TypeLiteral<List<T>> listOf(Class<? extends T> type) {
        return new TypeLiteral<>(List.class, type);
    }

    static <K, V> TypeLiteral<Map<K, V>> mapOf(Class<? extends K> keyType, Class<? extends V> valueType) {
        return new TypeLiteral<>(Map.class, keyType, valueType);
    }

    TypeLiteral(Class<? super T> type, Type... argumentsType) {
        this.type = type;
        this.typeName = type.getName();
        this.argumentsType = new String[argumentsType.length];//argumentsType;
        for(int i=0; i<argumentsType.length; i++) {
            if(argumentsType[i] instanceof ParameterizedType) {
                argumentsType[i] = ((ParameterizedType)argumentsType[i]).getRawType();
            }

            if(argumentsType[i] instanceof Class) {
                this.argumentsType[i] = ((Class)argumentsType[i]).getName();
            } else {
                this.argumentsType[i] = argumentsType[i].toString();
            }
        }
    }

    Class<? super T> getType() {
        return type;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        TypeLiteral<?> that = (TypeLiteral<?>) o;

        if (!typeName.equals(that.typeName)) return false;
        return Arrays.equals(argumentsType, that.argumentsType);
    }

    @Override
    public int hashCode() {
        int result = typeName.hashCode();
        result = 31 * result + Arrays.hashCode(argumentsType);
        return result;
    }

    @Override
    public String toString() {
        String result = typeName;
        if(argumentsType.length > 0) {
            result += Arrays.toString(argumentsType);
        }
        return result;
    }
}