package org.hedgewars.hedgeroid.netplay;

import java.util.Date;

import java.util.LinkedList;

import java.util.List;

import org.hedgewars.hedgeroid.R;

import android.content.Context;

import android.graphics.Color;

import android.graphics.Typeface;

import android.text.Html;

import android.text.Spannable;

import android.text.SpannableString;

import android.text.SpannableStringBuilder;

import android.text.Spanned;

import android.text.TextUtils;

import android.text.format.DateFormat;

import android.text.style.ForegroundColorSpan;

import android.text.style.RelativeSizeSpan;

import android.text.style.StyleSpan;

import android.util.Log;

public class MessageLog {

	private static final int BACKLOG_CHARS = 10000;

	private static final int INFO_COLOR = Color.GRAY;

	private static final int CHAT_COLOR = Color.GREEN;

	private static final int MECHAT_COLOR = Color.CYAN;

	private static final int WARN_COLOR = Color.RED;

	private static final int ERROR_COLOR = Color.RED;

	private final Context context;

	private List<Observer> observers = new LinkedList<Observer>();

	private SpannableStringBuilder log = new SpannableStringBuilder();

	private List<Integer> lineLengths = new LinkedList<Integer>();

	public MessageLog(Context context) {

		this.context = context;

	}

	private Spanned makeLogTime() {

		String time = DateFormat.getTimeFormat(context).format(new Date());

		return withColor("[" + time + "] ", INFO_COLOR);

	}

	private static Spanned span(CharSequence s, Object o) {

		Spannable spannable = new SpannableString(s);

		spannable.setSpan(o, 0, s.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

		return spannable;

	}

	private static Spanned withColor(CharSequence s, int color) {

		return span(s, new ForegroundColorSpan(color));

	}

	private static Spanned bold(CharSequence s) {

		return span(s, new StyleSpan(Typeface.BOLD));

	}

	private void append(CharSequence msg) {

		SpannableStringBuilder ssb = new SpannableStringBuilder();

		ssb.append(makeLogTime()).append(msg).append("\n");

		appendRaw(ssb);

	}

	private void appendRaw(CharSequence msg) {

		lineLengths.add(msg.length());

		log.append(msg);

		while(log.length() > BACKLOG_CHARS) {

			log.delete(0, lineLengths.remove(0));

		}

		for(Observer o : observers) {

			o.textChanged(log);

		}

	}

	void appendPlayerJoin(String playername) {

		append(withColor("***" + context.getResources().getString(R.string.log_player_join, playername), INFO_COLOR));

	}

	void appendPlayerLeave(String playername, String partMsg) {

		String msg = "***";

		if(partMsg != null) {

			msg += context.getResources().getString(R.string.log_player_leave_with_msg, playername, partMsg);

		} else {

			msg += context.getResources().getString(R.string.log_player_leave, playername);

		}

		append(withColor(msg, INFO_COLOR));

	}

	void appendChat(String playerName, String msg) {

		if(msg.startsWith("/me ")) {

			append(withColor("*"+playerName+" "+msg, MECHAT_COLOR));

		} else {

			Spanned name = bold(playerName+": ");

			Spanned fullMessage = withColor(TextUtils.concat(name, msg), CHAT_COLOR);

			append(fullMessage);			

		}

	}

	void appendMessage(int type, String msg) {

		switch(type) {

		case JnaFrontlib.NETCONN_MSG_TYPE_ERROR:

			append(withColor("***"+msg, ERROR_COLOR));

			break;

		case JnaFrontlib.NETCONN_MSG_TYPE_WARNING:

			append(withColor("***"+msg, WARN_COLOR));

			break;

		case JnaFrontlib.NETCONN_MSG_TYPE_PLAYERINFO:

			// TODO better formatting or different way to display

			append(msg);

			break;

		case JnaFrontlib.NETCONN_MSG_TYPE_SERVERMESSAGE:

			appendRaw(span(TextUtils.concat("\n", Html.fromHtml(msg), "\n\n"), new RelativeSizeSpan(1.5f)));

			break;

		default:

			Log.e("MessageLog", "Unknown messagetype "+type);

		}

	}

	void clear() {

		log.clear();

		lineLengths.clear();

	}

	public void observe(Observer o) {

		observers.add(o);

	}

	public void unobserve(Observer o) {

		observers.remove(o);

	}

	public static interface Observer {

		void textChanged(Spanned text);

	}

}