/**
 *
 * Copyright (c) 2006-2017, Speedment, Inc. All Rights Reserved.
 *
 * Licensed 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 com.speedment.common.codegen.internal.model;

import com.speedment.common.codegen.internal.util.Copier;
import com.speedment.common.codegen.model.AnnotationUsage;
import com.speedment.common.codegen.model.Value;

import java.lang.reflect.Type;
import java.util.*;
import java.util.Map.Entry;

import static java.util.Objects.requireNonNull;

/**
 * This is the default implementation of the {@link AnnotationUsage} interface.
 * This class should not be instantiated directly. Instead you should call the
 * {@link AnnotationUsage#of(Type) } method to get an instance. In that way, you
 * can layer change the implementing class without modifying the using code.
 *
 * @author Emil Forslund
 * @see AnnotationUsage
 */
public final class AnnotationUsageImpl extends AnnotationUsageBase {

    /**
     * Initializes this annotation usage using a type.
     * <p>
     * <b>Warning!</b> This class should not be instantiated directly but using
     * the {@link AnnotationUsage#of(Type)} method!
     *
     * @param type the type
     */
    public AnnotationUsageImpl(Type type) {
        super(requireNonNull(type));
    }

    /**
     * Copy constructor.
     *
     * @param prototype the prototype
     */
    protected AnnotationUsageImpl(AnnotationUsage prototype) {
        super(requireNonNull(prototype));
    }

    public final static class AnnotationUsageConst extends AnnotationUsageBase {

        public AnnotationUsageConst(Type type) {
            super(type);
        }

        @Override
        public AnnotationUsage set(Value<?> val) {
            return copy().set(val);
        }

        @Override
        public AnnotationUsage put(String key, Value<?> val) {
            return copy().put(key, val);
        }

        @Override
        public AnnotationUsage set(Type type) {
            return copy().set(type);
        }
    }
}

abstract class AnnotationUsageBase implements AnnotationUsage {

    private Type type;
    private Value<?> value;
    private final List<Entry<String, Value<?>>> values;

    AnnotationUsageBase(Type type) {
        this.type = type;
        this.value = null;
        this.values = new ArrayList<>();
    }

    AnnotationUsageBase(AnnotationUsage prototype) {
        type = prototype.getType();
        value = prototype.getValue().map(Copier::copy).orElse(null);
        values = Copier.copy(prototype.getValues(),
            e -> new AbstractMap.SimpleEntry<>(
                e.getKey(), e.getValue().copy()
            )
        );
    }

    @Override
    public AnnotationUsage set(Value<?> val) {
        value = val;
        return this;
    }

    @Override
    public AnnotationUsage put(String key, Value<?> val) {
        values.add(new AbstractMap.SimpleEntry<>(key, val));
        return this;
    }

    @Override
    public Optional<Value<?>> getValue() {
        return Optional.ofNullable(value);
    }

    @Override
    public List<Entry<String, Value<?>>> getValues() {
        return values;
    }

    @Override
    public AnnotationUsage set(Type type) {
        this.type = type;
        return this;
    }

    @Override
    public Type getType() {
        return type;
    }

    @Override
    public AnnotationUsageImpl copy() {
        return new AnnotationUsageImpl(this);
    }

    @Override
    public int hashCode() {
        int hash = 5;
        hash = 67 * hash + Objects.hashCode(this.type);
        hash = 67 * hash + Objects.hashCode(this.value);
        hash = 67 * hash + Objects.hashCode(this.values);
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final AnnotationUsageBase other = (AnnotationUsageBase) obj;
        if (!Objects.equals(this.type, other.type)) {
            return false;
        }
        if (!Objects.equals(this.value, other.value)) {
            return false;
        }
        return Objects.equals(this.values, other.values);
    }

}