/*
 * Copyright (C) 2011 Citrix Systems, 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.cloud.bridge.util;

import java.io.PrintWriter;
import java.lang.reflect.Field;
import java.util.Calendar;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;

/**
 * @author Kelven
 */
public class XSerializerXmlAdapter implements XSerializerAdapter {

	private XSerializer serializer;

	public XSerializerXmlAdapter() {
	}
	
	@Override
	public void setSerializer(XSerializer serializer) {
		this.serializer = serializer; 
	}
	
	@Override
	public void beginElement(String element, String namespace, int indentLevel, PrintWriter writer) {
		indent(true, indentLevel, writer);
		writer.print("<" + element);
		if(namespace != null && !namespace.isEmpty()) {
			writer.print(" xmlns=\"");
			writer.print(namespace);
			writer.print("\"");
		}
		writer.print(">");
	}
	
	@Override
	public void endElement(String element, int indentLevel, PrintWriter writer) {
		indent(true, indentLevel, writer);
		writer.print("</" + element + ">");
	}
	
	@Override
	public void writeElement(String elementName, String itemName, Object value, Field f, int indentLevel, PrintWriter writer) {
		Class<?> fieldType = f.getType();
		if(!serializer.isComposite(fieldType)) {
			if(fieldType == Date.class) {
				if(value != null) {
					indent(true, indentLevel, writer);
					writer.print("<" + elementName + ">");
					writer.print(DateHelper.getGMTDateFormat("yyyy-MM-dd").format((Date)value) + "T" 
						+ DateHelper.getGMTDateFormat("HH:mm:ss").format((Date)value) + ".000Z");
					writer.print("</" + elementName + ">");
				} else {
					if(!serializer.omitNullField(f)) {
						indent(true, indentLevel, writer);
						writer.print("<" + elementName + "/>");
					}
				}
			} else if(fieldType == Calendar.class) {
				if(value != null) {
					indent(true, indentLevel, writer);
					
					Date dt = ((Calendar)value).getTime();
					writer.print("<" + elementName + ">");
					writer.print(DateHelper.getGMTDateFormat("yyyy-MM-dd").format(dt) + "T" 
						+ DateHelper.getGMTDateFormat("HH:mm:ss").format(dt) + ".000Z");
					writer.print("</" + elementName + ">");
				} else {
					if(!serializer.omitNullField(f)) {
						indent(true, indentLevel, writer);
						writer.print("<" + elementName + "/>");
					}
				}
			} else {
				if(value != null) {
					indent(true, indentLevel, writer);
					if(!value.toString().isEmpty()) {
						writer.print("<" + elementName + ">");
						writer.print(value);
						writer.print("</" + elementName + ">");
					} else {
						writer.print("<" + elementName + "/>");
					}
				} else {
					if(!serializer.omitNullField(f)) {
						indent(true, indentLevel, writer);
						writer.print("<" + elementName + "/>");
					}
				}
			}
		} else if(fieldType.isArray()) {
			if(value != null) {
				if(!serializer.flattenField(f)) {
					indent(true, indentLevel, writer);
					writer.print("<" + elementName + ">");
					indentLevel++;
				}
	
				for(Object sub : (Object[])value) {
					serializer.serializeTo(sub, itemName, null, indentLevel, writer);
				}
	
				if(!serializer.flattenField(f)) {
					indentLevel--;
					indent(true, indentLevel, writer);
					writer.print("</" + elementName + ">");
				}
			} else {
				if(!serializer.omitNullField(f)) {
					indent(true, indentLevel, writer);
					writer.print("<" + elementName + "/>");
				}
			}
		} else if(Collection.class.isAssignableFrom(fieldType)) {
			if(value != null) {
				if(!serializer.flattenField(f)) {
					indent(true, indentLevel, writer);
					writer.print("<" + elementName + ">");
					indentLevel++;
				}
				
				Iterator it = ((Collection)value).iterator();
				if(it != null) {
					while(it.hasNext()) {
						Object sub = it.next();
						serializer.serializeTo(sub, itemName, null, indentLevel, writer);
					}
				}
				
				if(!serializer.flattenField(f)) {
					indentLevel--;
					indent(true, indentLevel, writer);
					writer.print("</" + elementName + ">");
				}
			} else {
				if(!serializer.omitNullField(f)) {
					indent(true, indentLevel, writer);
					writer.print("<" + elementName + "/>");
				}
			}
		} else {
			serializer.serializeTo(value, elementName, null, indentLevel, writer);
		}
	}
	
	@Override
	public void writeSeparator(int indentLevel, PrintWriter writer) {
		// do nothing
	}
	
	private void indent(boolean newLine, int indentLevel, PrintWriter writer) {
		if(newLine)
			writer.println("");
		for(int i = 0; i < indentLevel; i++)
			writer.append("    ");
	}
}