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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.apache.camel.language.xtokenizer;

import java.util.Iterator;
import java.util.Map;

import org.apache.camel.CamelContext;
import org.apache.camel.Exchange;
import org.apache.camel.Expression;
import org.apache.camel.spi.annotations.Language;
import org.apache.camel.support.ExpressionAdapter;
import org.apache.camel.support.IteratorConvertTo;
import org.apache.camel.support.SingleInputTypedLanguageSupport;
import org.apache.camel.support.builder.Namespaces;

/**
 * A language for tokenizer expressions.
 * 
 * This xmltokenizer language can operate in the following modes:
 * 

 * i - injecting the contextual namespace bindings into the extracted token (default)
 * w - wrapping the extracted token in its ancestor context
 * u - unwrapping the extracted token to its child content
 * t - extracting the text content of the specified element
 * 
 */
@Language("xtokenize")
public class XMLTokenizeLanguage extends SingleInputTypedLanguageSupport {

    @Override
    protected boolean supportResultType() {
        // result type is handled specially in tokenizer
        return false;
    }

    @Override
    public Expression createExpression(Expression source, String expression, Object[] properties) {
        Class type = property(Class.class, properties, 0, null);
        Character mode = property(Character.class, properties, 2, "i");

        XMLTokenExpressionIterator xml = new XMLTokenExpressionIterator(source, expression, mode);
        xml.setGroup(property(int.class, properties, 3, 1));
        Object obj = properties[4];
        if (obj != null) {
            Namespaces ns;
            if (obj instanceof Namespaces) {
                ns = (Namespaces) obj;
            } else if (obj instanceof Map) {
                ns = new Namespaces();
                ((Map) obj).forEach(ns::add);
            } else {
                throw new IllegalArgumentException(
                        "Namespaces is not instance of java.util.Map or " + Namespaces.class.getName());
            }
            xml.setNamespaces(ns.getNamespaces());
        }
        Expression answer = xml;

        if (type != null && type != Object.class) {
            // wrap iterator in a converter
            final Expression delegate = xml;
            answer = new ExpressionAdapter() {
                @Override
                public Object evaluate(Exchange exchange) {
                    Object value = delegate.evaluate(exchange, Object.class);
                    if (value instanceof Iterator it) {
                        value = new IteratorConvertTo(exchange, it, type);
                    }
                    return value;
                }

                @Override
                public void init(CamelContext context) {
                    super.init(context);
                    delegate.init(context);
                }

                @Override
                public String toString() {
                    return delegate.toString();
                }
            };
        }

        if (getCamelContext() != null) {
            answer.init(getCamelContext());
        }
        return answer;
    }

}