package org.ellab.elchat;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Handles the admin command.
 */
public class Command {
    private static Log log = LogFactory.getLog(EmotIcon.class);

    private static Map commandMap = new HashMap();

    private static final String CMD_SUSPEND = "suspend";
    private static final String CMD_RESUME = "resume";
    private static final String CMD_CLEAR = "clear";
    private static final String CMD_CLEARLAST = "clearlast";
    private static final String CMD_CLEARMSG = "clearmsg";
    private static final String CMD_CLEARALL = "clearall";
    private static final String CMD_STICKY = "sticky";
    private static final String CMD_REMOVESTICKY = "removesticky";
    private static final String CMD_LIMIT = "limit";
    private static final String CMD_MSGLENGTH = "msglength";
    private static final String CMD_ENABLEURL = "enableurl";
    private static final String CMD_DISABLEURL = "disableurl";
    private static final String CMD_ENABLEIMAGE = "enableimage";
    private static final String CMD_DISABLEIMAGE = "disableimage";
    private static final String CMD_RELOADEMOTICON = "releademoticon";
    private static final String CMD_ENABLEUSEREMOTICON = "enableuseremoticon";
    private static final String CMD_DISABLEUSEREMOTICON = "disableuseremoticon";
    private static final String CMD_ENABLEMSGEMOTICON = "enablemsgemoticon";
    private static final String CMD_DISABLEMSGEMOTICON = "disablemsgemoticon";
    private static final String CMD_ENABLEHTMLESCAPE = "enablehtmlescape";
    private static final String CMD_DISABLEHTMLESCAPE = "disablehtmlescape";
    private static final String CMD_INVISIBLE = "invisible";
    private static final String CMD_VISIBLE = "visible";

    static void init(String configFile) {
        InputStream is = null;
        Properties prop = new Properties();
        try {
            is = new FileInputStream(configFile);
            prop.load(is);
            commandMap.clear();
            for (Iterator it = prop.keySet().iterator(); it.hasNext();) {
                String key = (String) it.next();
                String value = prop.getProperty(key);
                commandMap.put(value, key);
            }
        }
        catch (IOException ex) {
            log.error(ex, ex);
        }
        finally {
            if (is != null) {
                try {
                    is.close();
                }
                catch (IOException ex) {
                    log.warn("Exception when closing input stream", ex);
                }
            }
        }
    }

    /**
     * @return true if a command is processed
     */
    static boolean process(String t, Chat chat, ChatConfig config) {
        // check command prefix
        String commandPrefix = ChatConfig.getInstance().getCommandPrefix();
        if (commandPrefix != null && commandPrefix.length() > 0) {
            if (!t.startsWith(commandPrefix)) {
                return false;
            }
            t = t.substring(commandPrefix.length());
        }

        String commandPart = t;
        String argPart = "";
        long argNum = 0;
        int pos = commandPart.indexOf(" ");
        if (pos > 0) {
            argPart = commandPart.substring(pos + 1).trim();
            try {
                argNum = Long.parseLong(argPart);
            }
            catch (NumberFormatException ex) {
                ; // do nothing
            }
            commandPart = commandPart.substring(0, pos).trim();
        }

        String command = (String) commandMap.get(commandPart);
        if (CMD_SUSPEND.equals(command)) {
            config.setSuspend(true);
        }
        else if (CMD_RESUME.equals(command)) {
            config.setSuspend(false);
        }
        else if (CMD_CLEAR.equals(command)) {
            if (argPart.length() > 0) {
                if (argNum > 0) {
                    for (int i = 0; i < argNum && chat.getNonStickyMessage().size() > 0; i++) {
                        chat.removeLastMessage();
                    }
                }
                else if (argNum < 0) {
                    for (int i = 0; i < (-argNum) && chat.getNonStickyMessage().size() > 0; i++) {
                        chat.removeFirstMessage();
                    }
                }
            }
            else {
                chat.clearMessage();
            }
        }
        else if (CMD_CLEARLAST.equals(command)) {
            chat.removeFirstMessage();
        }
        else if (CMD_CLEARMSG.equals(command)) {
            chat.clearMessage();
        }
        else if (CMD_CLEARALL.equals(command)) {
            chat.clearMessage();
            chat.clearSticky();
        }
        else if (CMD_STICKY.equals(command)) {
            if (argPart.length() > 0) {
                chat.setSticky(argNum);
            }
        }
        else if (CMD_REMOVESTICKY.equals(command)) {
            if (argPart.length() > 0) {
                chat.removeSticky(argNum);
            }
        }
        else if (CMD_LIMIT.equals(command)) {
            if (argNum > 0) {
                config.setLimit((int) argNum);
            }
        }
        else if (CMD_MSGLENGTH.equals(command)) {
            if (argNum > 0) {
                config.setMsgLength((int) argNum);
            }
        }
        else if (CMD_ENABLEURL.equals(command)) {
            config.setEnableUrl(true);
        }
        else if (CMD_DISABLEURL.equals(command)) {
            config.setEnableUrl(false);
        }
        else if (CMD_ENABLEIMAGE.equals(command)) {
            config.setEnableImage(true);
        }
        else if (CMD_DISABLEIMAGE.equals(command)) {
            config.setEnableImage(false);
        }
        else if (CMD_RELOADEMOTICON.equals(command)) {
            EmotIcon.reInit();
        }
        else if (CMD_ENABLEUSEREMOTICON.equals(command)) {
            config.setEnableUserEmotIcon(true);
        }
        else if (CMD_DISABLEUSEREMOTICON.equals(command)) {
            config.setEnableUserEmotIcon(false);
        }
        else if (CMD_ENABLEMSGEMOTICON.equals(command)) {
            config.setEnableMsgEmotIcon(true);
        }
        else if (CMD_DISABLEMSGEMOTICON.equals(command)) {
            config.setEnableMsgEmotIcon(false);
        }
        else if (CMD_ENABLEHTMLESCAPE.equals(command)) {
            config.setEnableHtmlEscape(true);
        }
        else if (CMD_DISABLEHTMLESCAPE.equals(command)) {
            config.setEnableHtmlEscape(false);
        }
        else if (CMD_VISIBLE.equals(command)) {
            ;
        }
        else if (CMD_INVISIBLE.equals(command)) {
            ;
        }
        else {
            return false;
        }

        return true;
    }
}