package chat.server.call;

import java.math.BigDecimal;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.log4j.Logger;

import chat.server.im.ResultPool;
import frame.object.dao.Page;
import frame.object.data.Entity;
import frame.object.data.EntitySet;
import frame.object.data.EntityTree;
import frame.object.reader.EntityReaderContainer;
import frame.object.reader.IEntityReader;
import frame.object.reader.NameValuePair;


public class CachedJSONWriter {

	public final static String Code_URL = "url";

	protected static Logger logger;
	protected static EntityReaderContainer objectReaderContainer;
	protected StringBuilderJSONWriter writer; // 响应字符流

	static {
		logger = Logger.getLogger(CachedJSONWriter.class);
		objectReaderContainer = EntityReaderContainer.getInstance();
	}

	public CachedJSONWriter() {
		writer = new StringBuilderJSONWriter();
	}

	public String create(ResultPool result) throws Exception {
		writer.beginObject();
		try {
			//1. code
			ResultCode code = result.getCode();
			writer.write("code", code.getValue());
			writer.write("message", code.getMsg());

			//2. result
			List<ResultItem> itemList = result.getItemList();
			writeResultItems(itemList);
		}
		finally {
			writer.endObject();
		}
		
		return writer.toString();
	}

	private void writeResultItems(List<ResultItem> itemList) throws Exception {
		for (ResultItem item: itemList) {
			String name = item.getName();
			
			if (name == null) {
				name = createValueName(item.getValue());
				item.setName(name);
			}
		}
		
		for (ResultItem item: itemList) {
			String name = item.getName(); 
			Object value = item.getValue();
			
			if (name == null) {
				continue;
			}
			
			writeData(name, value);
		}		
	}

	private String createValueName(Object value) {
		if (value instanceof Entity) {
			return IEnvelop.ResultCode_Entity;
		}
		else if (value instanceof EntityTree) {
			return IEnvelop.ResultCode_EntityTree;
		}
		else if (value instanceof EntitySet) {
			return IEnvelop.ResultCode_EntitySet;
		}
		else if (value instanceof Page) {
			return IEnvelop.ResultCode_Page;
		}
		else if (value instanceof Collection) {
			return IEnvelop.ResultCode_EntitySet;
		}
		else {
			return "data";
		}
	}
	
	private void writeData(String name, Object value) throws Exception {
		if (value == null) {
			writer.writeNull(name);
			return;
		}
		
		//1. entity、entitySet、entityTree、page ...
		if (value instanceof IJsonProvider) {
			writeJsonProvider(name, (IJsonProvider) value);
		}
		//2. collection
		else if (value instanceof Collection) {
			writeCollection(name, (Collection<?>) value);
		}
		//3. iterator
		else if (value instanceof Iterable<?>) {
			writeIterable(name, (Iterable<?>) value);
		}	
		//4. map
		else if (value instanceof Map<?, ?>) {
			writeMap(name, (Map<?, ?>)value);
		}
		//5. string、integer、double、decimal、boolean、date、object ...
		else {
			writeObject(name, value);
		}
	}

	private void writeMap(String name, Map<?, ?> value) throws Exception {
		//1. name
		if (name != null) {
			writer.writeName(name);
		}
		
		//2. null data 
		if (value == null) {
			writer.writeNull();
			return;
		}
		
		//3. collection data
		writer.beginObject();
		Set<?> keySet = value.keySet();
		for (Object key : keySet) {
			Object obj = value.get(key);
			
			writeData(key.toString(), obj);
		}

		writer.endObject();
		
	}

	private void writeJsonProvider(String name, IJsonProvider jsonProvider) {
		//1. name
		if (name != null) {
			writer.writeName(name);
		}
		
		//2. null entity 
		if (jsonProvider == null) {
			writer.writeNull();
			return;
		}
		
		//3. entity data
		jsonProvider.writeJSONObject(writer);
	}
	
	private void writeCollection(String name, Collection<?> collection) throws Exception {
		//1. name
		if (name != null) {
			writer.writeName(name);
		}
		
		//2. null data 
		if (collection == null) {
			writer.writeNull();
			return;
		}
		
		//3. collection data
		writer.beginArray();
		
		for (Object obj : collection) {
			writeData(null, obj);
		}

		writer.endArray();
	}

	private void writeIterable(String name, Iterable<?> iterable) throws Exception {
		//1. name
		if (name != null) {
			writer.writeName(name);
		}
		
		//2. null data 
		if (iterable == null) {
			writer.writeNull();
			return;
		}
		
		//3. collection data
		writer.beginArray();
		
		Iterator<?> iterator = iterable.iterator();
		
		while(iterator.hasNext()) {
			Object obj = iterator.next();
			writeData(null, obj);
		}

		writer.endArray();		
	}

	private void writeObject(String name, Object value) throws Exception {
		//1. null data 
		if (value == null) {
			writer.writeNull(name);
			return;
		}
		
		if (value instanceof String) {
			writer.write(name, (String) value);
		}
		else if (value instanceof Integer) {
			writer.write(name, (Integer) value);
		}
		else if (value instanceof Double) {
			writer.write(name, (Double) value);
		}		
		else if (value instanceof BigDecimal) {
			writer.write(name, (BigDecimal) value);
		}
		else if (value instanceof Date) {
			writer.write(name, (Date) value);
		}
		else if (value instanceof Boolean) {
			writer.write(name, (Boolean) value);
		}
		else if (value instanceof Enum) {
			writer.write(name, value.toString());
		}
		else if (value instanceof IJsonProvider) {
			writer.writeName(name);
			IJsonProvider jsonAvailable = (IJsonProvider) value;
			jsonAvailable.writeJSONObject(writer);
		}
		else {
			IEntityReader entityReader = objectReaderContainer.getEntityReader(value.getClass());
			
			if (value instanceof String[]) {
				 System.out.println(value);
			}
			List<NameValuePair> values = entityReader.getValueList(value);
			
			writer.beginObject(name);
			
			for (NameValuePair nameValuePair: values) {
				 writeData(nameValuePair.getName(), nameValuePair.getValue());
			}
			
			writer.endObject();
		}
	}

}