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/*
 * Copyright 2004-2022 the original author or authors.
 *
 * 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
 *
 *      https://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.grails.web.converters.configuration;

import java.util.ArrayList;
import java.util.List;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.concurrent.atomic.AtomicInteger;

import groovy.lang.Closure;

import grails.core.support.proxy.DefaultProxyHandler;
import grails.core.support.proxy.ProxyHandler;

import org.grails.web.converters.Converter;
import org.grails.web.converters.marshaller.ClosureObjectMarshaller;
import org.grails.web.converters.marshaller.ObjectMarshaller;

/**
 * Mutable Converter Configuration with an priority sorted set of ObjectMarshallers
 *
 * @author Siegfried Puchbauer
 * @since 1.1
 */
@SuppressWarnings("rawtypes")
public class DefaultConverterConfiguration implements ConverterConfiguration {

    public static final int DEFAULT_PRIORITY = 0;

    private static final AtomicInteger MARSHALLER_SEQUENCE = new AtomicInteger(0);

    private ConverterConfiguration delegate;

    private String encoding;

    private boolean prettyPrint = false;

    private final SortedSet objectMarshallers = new TreeSet<>();

    private Converter.CircularReferenceBehaviour circularReferenceBehaviour;

    private ProxyHandler proxyHandler;

    private boolean cacheObjectMarshallerByClass = true;

    public DefaultConverterConfiguration() {
        this.proxyHandler = new DefaultProxyHandler();
    }

    public DefaultConverterConfiguration(ConverterConfiguration delegate) {
        this();
        this.delegate = delegate;
        this.prettyPrint = delegate.isPrettyPrint();
        this.circularReferenceBehaviour = delegate.getCircularReferenceBehaviour();
        this.encoding = delegate.getEncoding();
    }

    public DefaultConverterConfiguration(ProxyHandler proxyHandler) {
        this.proxyHandler = proxyHandler;
    }

    public DefaultConverterConfiguration(ConverterConfiguration delegate, ProxyHandler proxyHandler) {
        this(proxyHandler);
        this.delegate = delegate;
        this.prettyPrint = delegate.isPrettyPrint();
        this.circularReferenceBehaviour = delegate.getCircularReferenceBehaviour();
        this.encoding = delegate.getEncoding();
    }

    public DefaultConverterConfiguration(List> oms) {
        this();
        int initPriority = -1;
        for (ObjectMarshaller om : oms) {
            registerObjectMarshaller(om, initPriority--);
        }
    }

    public DefaultConverterConfiguration(List> oms, ProxyHandler proxyHandler) {
        this(oms);
        this.proxyHandler = proxyHandler;
    }

    public String getEncoding() {
        return this.encoding != null ? this.encoding : (this.delegate != null ? this.delegate.getEncoding() : null);
    }

    public void setEncoding(String encoding) {
        this.encoding = encoding;
    }

    public Converter.CircularReferenceBehaviour getCircularReferenceBehaviour() {
        return this.circularReferenceBehaviour != null
                ? this.circularReferenceBehaviour
                : (this.delegate != null ? this.delegate.getCircularReferenceBehaviour() : null);
    }

    public boolean isPrettyPrint() {
        return this.prettyPrint;
    }

    public void setPrettyPrint(boolean prettyPrint) {
        this.prettyPrint = prettyPrint;
    }

    public List> getOrderedObjectMarshallers() {
        List> list = new ArrayList<>();
        for (Entry entry : this.objectMarshallers) {
            list.add(entry.marshaller);
        }
        if (this.delegate != null) {
            for (ObjectMarshaller om : this.delegate.getOrderedObjectMarshallers()) {
                list.add(om);
            }
        }
        return list;
    }

    public void setCircularReferenceBehaviour(Converter.CircularReferenceBehaviour circularReferenceBehaviour) {
        this.circularReferenceBehaviour = circularReferenceBehaviour;
    }

    public void registerObjectMarshaller(ObjectMarshaller marshaller) {
        registerObjectMarshaller(marshaller, DEFAULT_PRIORITY);
    }

    public void registerObjectMarshaller(ObjectMarshaller marshaller, int priority) {
        this.objectMarshallers.add(new Entry(marshaller, priority));
    }

    public void registerObjectMarshaller(Class c, int priority, Closure callable) {
        registerObjectMarshaller(new ClosureObjectMarshaller(c, callable), priority);
    }

    public void registerObjectMarshaller(Class c, Closure callable) {
        registerObjectMarshaller(new ClosureObjectMarshaller(c, callable));
    }

    public ObjectMarshaller getMarshaller(Object o) {
        for (Entry entry : this.objectMarshallers) {
            if (entry.marshaller.supports(o)) {
                return entry.marshaller;
            }
        }
        return this.delegate != null ? this.delegate.getMarshaller(o) : null;
    }

    public ProxyHandler getProxyHandler() {
        return this.proxyHandler;
    }

    public boolean isCacheObjectMarshallerByClass() {
        return this.cacheObjectMarshallerByClass;
    }

    public void setCacheObjectMarshallerByClass(boolean cacheObjectMarshallerByClass) {
        this.cacheObjectMarshallerByClass = cacheObjectMarshallerByClass;
    }

    public final class Entry implements Comparable {

        private final ObjectMarshaller marshaller;

        private final int priority;

        private final int seq;

        private Entry(ObjectMarshaller marshaller, int priority) {
            this.marshaller = marshaller;
            this.priority = priority;
            this.seq = MARSHALLER_SEQUENCE.incrementAndGet();
        }

        public int compareTo(Entry entry) {
            return this.priority == entry.priority ? entry.seq - this.seq : entry.priority - this.priority;
        }

    }

}