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/*
 * Copyright 2003-2012 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
 *
 *     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 groovy.util.slurpersupport;

import groovy.lang.Closure;
import groovy.lang.GroovyObject;
import groovy.lang.GroovyRuntimeException;

import java.io.IOException;
import java.io.Writer;
import java.util.Iterator;
import java.util.Map;

import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;

/**
 * Lazy evaluated representation of a node attribute.
 *
 * @author John Wilson
 */
public class Attribute extends GPathResult {
    private final String value;

    /**
     * @param name              of the attribute
     * @param value             of the attribute
     * @param parent            the GPathResult prior to the application of the expression creating this GPathResult
     * @param namespacePrefix   the namespace prefix if any
     * @param namespaceTagHints the known tag to namespace mappings
     */
    public Attribute(final String name, final String value, final GPathResult parent, final String namespacePrefix, final Map namespaceTagHints) {
        super(parent, name, namespacePrefix, namespaceTagHints);
        this.value = value;
    }

    public String name() {
        // this name contains @name we need to return name
        return this.name.substring(1);
    }

    /**
     * Returns the size of this Attribute, which is always 1.
     * @return 1
     */
    public int size() {
        return 1;
    }

    /**
     * Returns the value of this Attribute.
     * @return the value of this Attribute
     */
    public String text() {
        return this.value;
    }

    /**
     * Returns the URI of the namespace of this Attribute.
     * @return the namespace of this Attribute
     */
    public String namespaceURI() {
        if (namespacePrefix == null) return "";
        String uri = namespaceTagHints.get(namespacePrefix);
        return uri == null ? "" : uri;
    }

    /**
     * Throws a GroovyRuntimeException, because this method is not implemented yet.
     */
    public GPathResult parents() {
        // TODO Auto-generated method stub
        throw new GroovyRuntimeException("parents() not implemented yet");
    }

    /**
     * Throws a GroovyRuntimeException, because an attribute can have no children.
     */
    public Iterator childNodes() {
        throw new GroovyRuntimeException("can't call childNodes() in the attribute " + this.name);
    }

    public Iterator iterator() {
        return nodeIterator();
    }

    public GPathResult find(final Closure closure) {
        if (DefaultTypeTransformation.castToBoolean(closure.call(new Object[]{this}))) {
            return this;
        } else {
            return new NoChildren(this, "", this.namespaceTagHints);
        }
    }

    public GPathResult findAll(final Closure closure) {
        return find(closure);
    }

    public Iterator nodeIterator() {
        return new Iterator() {
            private boolean hasNext = true;

            public boolean hasNext() {
                return this.hasNext;
            }

            public Object next() {
                try {
                    return (this.hasNext) ? Attribute.this : null;
                } finally {
                    this.hasNext = false;
                }
            }

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

    public Writer writeTo(final Writer out) throws IOException {
        out.write(this.value);
        return out;
    }

    public void build(final GroovyObject builder) {
        builder.getProperty("mkp");
        builder.invokeMethod("yield", new Object[]{this.value});
    }

    /**
     * NOP, because an attribute does not have any Node to replace.
     */
    protected void replaceNode(final Closure newValue) {
    }

    /**
     * NOP, because an attribute does not have a Body.
     */
    protected void replaceBody(final Object newValue) {
    }

    /**
     * NOP, because an node can not be appended to an attribute.
     */
    protected void appendNode(final Object newValue) {
    }
}