package net.sabi.pester;

import danger.app.Application;
import danger.text.Collator;
import danger.text.DangerCollator;
import danger.ui.ListSelectMenu;
import danger.ui.MenuItem;
import danger.util.DEBUG;
import danger.util.TextFinder;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedList;
import java.util.ListIterator;
import java.util.Vector;

class MessageFinder implements TextFinder, Resources {
    private static final int VERSION_1 = 1;
    private static final int MAX_MESSAGE_COUNT = 50;
    private static LinkedList sMessageList = new LinkedList();
    private Vector mItems;

    public static void setDefaultMessageList() {
	String messages[] =
	    Application.getCurrentApp().getStringArray(ID_ALARM_MESSAGES);
	sMessageList = new LinkedList(Arrays.asList(messages));
    }

    public static byte[] messageListAsByteArray() {
	try {
	    ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
	    DataOutputStream dataStream = new DataOutputStream(byteStream);

	    dataStream.writeByte(VERSION_1);
	    dataStream.writeInt(sMessageList.size());
	    ListIterator i = sMessageList.listIterator(0);
	    while (i.hasNext())
		dataStream.writeUTF((String)i.next());
	    dataStream.flush();
	    return byteStream.toByteArray();
	} catch (Exception e) {
	    DEBUG.p("Pester: couldn't serialize message list: " + e);
	}
	return null;
    }

    public static void setMessageListFromByteArray(byte[] data) {
	try {
	    ByteArrayInputStream byteStream = new ByteArrayInputStream(data);
	    DataInputStream dataStream = new DataInputStream(byteStream);
	    
	    byte version = dataStream.readByte();
	    if (version != VERSION_1)
		throw new Exception();
	    
	    int count = dataStream.readInt();
	    for (int i = 0 ; i < count ; i++)
		addMessage(dataStream.readUTF());
	} catch (Exception e) {
	    setDefaultMessageList();
	    DEBUG.p("Pester: setting default message list: " + e);
	}
    }

    private static boolean addMessage(String message) {
	int i = sMessageList.indexOf(message);
	if (i == 0)
	    return false;
	if (i != -1)
	    sMessageList.remove(i);
	sMessageList.addFirst(message);
	if (sMessageList.size() > MAX_MESSAGE_COUNT)
	    sMessageList.removeLast();
	return true;
    }

    public static void usedMessage(String message) {
	if (!addMessage(message))
	    return;
	Alarms.recentMessagesChanged();
    }

    public MessageFinder() {
	mItems = new Vector(sMessageList.size() / 2);
    }

    public void search(ListSelectMenu menu, String key) {
	DangerCollator collator = (DangerCollator)DangerCollator.getInstance();
	mItems.removeAllElements();
	ListIterator i = sMessageList.listIterator(0);
	while (i.hasNext()) {
	    String message = (String)i.next();
	    if (collator.startsWith(message, key, Collator.PRIMARY)) {
		mItems.addElement(new MenuItem(message));
	    }
	}
	Collections.sort(mItems);
	menu.makeResultInclusive(true);
	menu.updateMenuContents(mItems);
    }
}