package org.hedgewars.mobile.EngineProtocol;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.FilenameFilter;

import java.io.IOException;

import java.io.OutputStream;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.LinkedHashMap;

import org.xmlpull.v1.XmlPullParser;

import org.xmlpull.v1.XmlPullParserException;

import org.xmlpull.v1.XmlPullParserFactory;

import android.content.Context;

import android.os.Parcel;

import android.os.Parcelable;

public class Scheme implements Parcelable{

	public static final String DIRECTORY_SCHEME = "schemes";

	private String name;

	//private ArrayList<Integer> basic;

	private Integer gamemod;

	private ArrayList<Integer> basic;;

	private static ArrayList<LinkedHashMap<String, ?>> basicflags = new ArrayList<LinkedHashMap<String, ?>>();

	public Scheme(String _name, ArrayList<Integer> _basic, int _gamemod){

		name = _name;

		gamemod = _gamemod;

		basic = _basic;

	}

	public Scheme(Parcel in){

		readFromParcel(in);

	}

	public void sendToEngine(OutputStream os)throws IOException{ 

		os.write(String.format("e$gmflags %d", gamemod).getBytes());

		for(int pos = 0; pos < basic.size(); pos++){

			LinkedHashMap<String, ?> basicflag = basicflags.get(pos);

			String command = (String)basicflag.get("command");

			Integer value = basic.get(pos);

			Boolean checkOverMax = (Boolean) basicflag.get("checkOverMax");

			Boolean times1000 = (Boolean) basicflag.get("times1000");

			Integer max = (Integer) basicflag.get("max");

			if(checkOverMax && value >= max) value = max;

			if(times1000) value *= 1000;

			os.write(String.format("%s %d", command, value).getBytes());

		}

		os.flush();

	}

	public String toString(){

		return name;

	}

	public static final int STATE_START = 0;

	public static final int STATE_ROOT = 1;

	public static final int STATE_NAME = 2;

	public static final int STATE_BASICFLAGS = 3;

	public static final int STATE_GAMEMOD = 4;

	public static final int STATE_BASICFLAG_INTEGER = 5;

	public static final int STATE_GAMEMOD_TRUE = 6;

	public static final int STATE_GAMEMOD_FALSE = 7;

	public static ArrayList<Scheme> getSchemes(Context c) throws IllegalArgumentException{

		String dir = c.getFilesDir().getAbsolutePath() + '/' + DIRECTORY_SCHEME + '/';

		String[] files = new File(dir).list(fnf);

		if(files == null) files = new String[]{};

		Arrays.sort(files);

		ArrayList<Scheme> schemes = new ArrayList<Scheme>();

		try {

			XmlPullParserFactory xmlPullFactory = XmlPullParserFactory.newInstance();

			XmlPullParser xmlPuller = xmlPullFactory.newPullParser();

			for(String file : files){

				BufferedReader br = new BufferedReader(new FileReader(dir + file), 1024);

				xmlPuller.setInput(br);

				String name = null;

				ArrayList<Integer> basic = new ArrayList<Integer>();

				Integer gamemod = 0;

				int mask = 0x000000004;

				int eventType = xmlPuller.getEventType();

				int state = STATE_START;

				while(eventType != XmlPullParser.END_DOCUMENT){

					switch(state){

					case STATE_START:

						if(eventType == XmlPullParser.START_TAG && xmlPuller.getName().equals("scheme")) state = STATE_ROOT;

						else if(eventType != XmlPullParser.START_DOCUMENT) throwException(file, eventType);

						break;

					case STATE_ROOT:

						if(eventType == XmlPullParser.START_TAG){

							if(xmlPuller.getName().equals("basicflags")) state = STATE_BASICFLAGS;

							else if(xmlPuller.getName().toLowerCase().equals("gamemod")) state = STATE_GAMEMOD;

							else if(xmlPuller.getName().toLowerCase().equals("name")) state = STATE_NAME;

							else throwException(file, eventType);

						}else if(eventType == XmlPullParser.END_TAG) state = STATE_START;

						else throwException(xmlPuller.getText(), eventType);

						break;

					case STATE_BASICFLAGS:

						if(eventType == XmlPullParser.START_TAG && xmlPuller.getName().toLowerCase().equals("integer")) state = STATE_BASICFLAG_INTEGER;

						else if(eventType == XmlPullParser.END_TAG)	state = STATE_ROOT;

						else throwException(file, eventType);

						break;

					case STATE_GAMEMOD:

						if(eventType == XmlPullParser.START_TAG){

							if(xmlPuller.getName().toLowerCase().equals("true")) state = STATE_GAMEMOD_TRUE;

							else if(xmlPuller.getName().toLowerCase().equals("false")) state = STATE_GAMEMOD_FALSE;

							else throwException(file, eventType);

						}else if(eventType == XmlPullParser.END_TAG) state = STATE_ROOT;

						else throwException(file, eventType);

						break;

					case STATE_NAME:

						if(eventType == XmlPullParser.TEXT) name = xmlPuller.getText().trim();

						else if(eventType == XmlPullParser.END_TAG) state = STATE_ROOT;

						else throwException(file, eventType);

						break;

					case STATE_BASICFLAG_INTEGER:

						if(eventType == XmlPullParser.TEXT) basic.add(Integer.parseInt(xmlPuller.getText().trim()));

						else if(eventType == XmlPullParser.END_TAG) state = STATE_BASICFLAGS;

						else throwException(file, eventType);

						break;

					case STATE_GAMEMOD_FALSE:

						if(eventType == XmlPullParser.TEXT) gamemod <<= 1;

						else if(eventType == XmlPullParser.END_TAG) state = STATE_GAMEMOD;

						else throwException(file, eventType);

						break;

					case STATE_GAMEMOD_TRUE:

						if(eventType == XmlPullParser.TEXT){

							gamemod |= mask;

							gamemod <<= 1;

						}else if(eventType == XmlPullParser.END_TAG) state = STATE_GAMEMOD;

						else throwException(file, eventType);

						break;

					}

					eventType = getEventType(xmlPuller);

				}//end while(eventtype != END_DOCUMENT

				schemes.add(new Scheme(name, basic, gamemod));

			}//end for(string file : files

			return schemes;

		} catch (XmlPullParserException e) {

			e.printStackTrace();

		} catch (FileNotFoundException e) {

			e.printStackTrace();

		} catch (IOException e) {

			e.printStackTrace();

		}

		return new ArrayList<Scheme>();//TODO handle correctly

	}

	private static FilenameFilter fnf = new FilenameFilter(){

		public boolean accept(File dir, String filename) {

			return filename.toLowerCase().startsWith("scheme_");

		}

	};

	/**

	 * This method will parse the basic flags from a prespecified xml file.

	 * I use a raw xml file rather than one parsed by aatp at compile time

	 * to keep it generic with other frontends, ie in the future we could 

	 * use one provided by the Data folder.

	 */

	public static void parseBasicFlags(Context c){

		String filename = String.format("%s/%s/basicflags", c.getFilesDir().getAbsolutePath(), DIRECTORY_SCHEME);

		XmlPullParser xmlPuller = null;

		BufferedReader br = null;

		try {

			XmlPullParserFactory xmlPullFactory = XmlPullParserFactory.newInstance();

			xmlPuller = xmlPullFactory.newPullParser();

			br = new BufferedReader(new FileReader(filename), 1024);

			xmlPuller.setInput(br);

			int eventType = getEventType(xmlPuller);

			boolean continueParsing = true;

			do{

				switch(eventType){

				case XmlPullParser.START_TAG:

					if(xmlPuller.getName().toLowerCase().equals("flag")){

						basicflags.add(parseFlag(xmlPuller));

					}else if(xmlPuller.getName().toLowerCase().equals("basicflags")){

						eventType = getEventType(xmlPuller);

					}else{

						skipCurrentTag(xmlPuller);

						eventType = getEventType(xmlPuller);

					}

					break;

				case XmlPullParser.START_DOCUMENT://ignore all tags not being "flag"

				case XmlPullParser.END_TAG:

				case XmlPullParser.TEXT:

				default:

					continueParsing = true;

				case XmlPullParser.END_DOCUMENT:

					continueParsing = false;

				}

			}while(continueParsing);

		}catch(IOException e){

			e.printStackTrace();

		}catch (XmlPullParserException e) {

			e.printStackTrace();

		}finally{

			if(br != null)

				try {

					br.close();

				} catch (IOException e) {}

		}

	}

	/*

	 * * Parses a Tag structure from xml as example we use

	 *<flag>

	 *   <checkOverMax>

	 *       <boolean>false</boolean>

	 *   </checkOverMax>

	 *</flag>

	 *

	 * It returns a LinkedHashMap with key/value pairs

	 */

	private static LinkedHashMap<String, Object> parseFlag(XmlPullParser xmlPuller)throws XmlPullParserException, IOException{

		LinkedHashMap<String, Object> hash = new LinkedHashMap<String, Object>();

		int eventType = xmlPuller.getEventType();//Get the event type which triggered this method

		if(eventType == XmlPullParser.START_TAG && xmlPuller.getName().toLowerCase().equals("flag")){//valid start of flag tag

			String lcKey = null;

			String lcType = null;

			String value = null;

			eventType = getEventType(xmlPuller);//<checkOverMax>

			while(eventType == XmlPullParser.START_TAG){

				lcKey = xmlPuller.getName();//checkOverMax

				if(getEventType(xmlPuller) == XmlPullParser.START_TAG){//<boolean>

					lcType = xmlPuller.getName().toLowerCase();

					if(getEventType(xmlPuller) == XmlPullParser.TEXT){

						value = xmlPuller.getText();

						if(getEventType(xmlPuller) == XmlPullParser.END_TAG && //</boolean> 

								getEventType(xmlPuller) == XmlPullParser.END_TAG){//</checkOverMax>

							if(lcType.equals("boolean")) hash.put(lcKey, new Boolean(value));

							else if(lcType.equals("string"))hash.put(lcKey, value);							

							else if(lcType.equals("integer")){

								try{

									hash.put(lcKey, new Integer(value));

								}catch (NumberFormatException e){

									throw new XmlPullParserException("Wrong integer value in xml file");

								}

							}else{

								throwException("basicflags", eventType);

							}

						}//</boolean> / </checkOverMax>

					}//if TEXT

				}//if boolean

				eventType = getEventType(xmlPuller);//start new loop

			}

			eventType = getEventType(xmlPuller);//</flag>

		}

		return hash;

	}

	private static void skipCurrentTag(XmlPullParser xmlPuller) throws XmlPullParserException, IOException{

		int eventType = xmlPuller.getEventType();

		if(eventType != XmlPullParser.START_TAG)return;

		String tag = xmlPuller.getName().toLowerCase();

		while(true){

			eventType = getEventType(xmlPuller);//getNext()

			switch(eventType){

			case XmlPullParser.START_DOCUMENT://we're inside of a start tag so START_ or END_DOCUMENT is just wrong

			case XmlPullParser.END_DOCUMENT:

				throw new XmlPullParserException("invalid xml file");

			case XmlPullParser.START_TAG://if we get a new tag recursively handle it

				skipCurrentTag(xmlPuller);

				break;

			case XmlPullParser.TEXT:

				break;

			case XmlPullParser.END_TAG:

				if(!xmlPuller.getName().toLowerCase().equals(tag)){//if the end tag doesn't match the start tag

					throw new XmlPullParserException("invalid xml file");

				}else{

					return;//skip completed	

				}

			}

		}

	}

	/**

	 * Skips whitespaces..

	 */

	private static int getEventType(XmlPullParser xmlPuller)throws XmlPullParserException, IOException{

		int eventType = xmlPuller.next();

		while(eventType == XmlPullParser.TEXT && xmlPuller.isWhitespace()){

			eventType = xmlPuller.next();

		}

		return eventType;

	}

	private static void throwException(String file, int eventType){

		throw new IllegalArgumentException(String.format("Xml file: %s malformed with error: %d.", file, eventType));

	}

	@Override

	public int describeContents() {

		// TODO Auto-generated method stub

		return 0;

	}

	public void writeToParcel(Parcel dest, int flags) {

		dest.writeString(name);

		dest.writeInt(gamemod);

		dest.writeList(basic);

	}

	public void readFromParcel(Parcel src){

		name = src.readString();

		gamemod = src.readInt();

		basic = src.readArrayList(ArrayList.class.getClassLoader());

	}

	public static final Parcelable.Creator<Scheme> CREATOR = new Parcelable.Creator<Scheme>() {

		public Scheme createFromParcel(Parcel source) {

			return new Scheme(source);

		}

		public Scheme[] newArray(int size) {

			return new Scheme[size];

		}

	};

}