package org.madore.android.unicodeMap;

import java.util.Arrays;
import java.util.List;
import java.util.ArrayList;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.KeyEvent;
import android.widget.*;
import android.text.ClipboardManager;
import android.app.ListActivity;
import android.app.ProgressDialog;

public final class UnicodeMapActivity extends ListActivity {

    protected UnicodeDatabase db;

    protected final List<UnicodeDisplayable> rootList
	= new ArrayList<UnicodeDisplayable>(200);

    protected final List<UnicodeArrayAdapter> stack
	= new ArrayList<UnicodeArrayAdapter>(10);
    protected final List<Integer> positionStack
	= new ArrayList<Integer>(10);
    protected final List<Integer> positionYStack
	= new ArrayList<Integer>(10);

    protected void launchPopulation() {
	final ProgressDialog progress = new ProgressDialog(this);
	progress.setOwnerActivity(this);
	progress.setTitle(R.string.loading_database_title);
	progress.setMessage(getResources().getText(R.string.loading_database_msg));
	progress.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
	progress.setCancelable(false);
	progress.show();
	final Handler handler = new Handler() {
		public void handleMessage(Message msg) {
		    int done = msg.getData().getInt("done");
		    int total = msg.getData().getInt("total");
		    progress.setMax(total);
		    progress.setProgress(done);
		    if ( done >= total )
			progress.dismiss();
		}
	    };
	final Thread thr = new Thread() {
		public void run() {
		    final UnicodeDatabase writeDb
			= new UnicodeDatabase(UnicodeMapActivity.this);
		    writeDb.populate(handler);
		}
	    };
	thr.start();
    }

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
	setContentView(R.layout.main_layout);
	db = new UnicodeDatabase(this);
	final boolean needPopulate = db.needPopulate();
	if ( needPopulate )
	    launchPopulation();
	for ( UnicodeCharacter.Range rng : UnicodeCharacter.Range.values() )
	    rootList.add(rng);
	UnicodeArrayAdapter rootAdapter
	    = new UnicodeArrayAdapter(this, rootList);
	stack.add(rootAdapter);
	setListAdapter(rootAdapter);
	final ClipboardManager cmgr
	    = (ClipboardManager)getSystemService(Context.CLIPBOARD_SERVICE);
	final Button btn = (Button) findViewById(R.id.button);
	final EditText txt = (EditText) findViewById(R.id.edit);
	btn.setOnClickListener(new View.OnClickListener() {
		public void onClick(View view) {
		    cmgr.setText(txt.getText());
		    Toast.makeText(getApplicationContext(),
				   R.string.copied_toast,
				   Toast.LENGTH_SHORT).show();
		}
	    });
	final ListView lv = getListView();
	lv.setTextFilterEnabled(true);
	lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
		public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
		    UnicodeDisplayable it
			= (UnicodeDisplayable)parent.getItemAtPosition(position);
		    if ( it instanceof UnicodeCharacter )
			txt.append(((UnicodeCharacter)it).getChar());
		    else if ( it instanceof UnicodeCharacter.Range ) {
			int from = ((UnicodeCharacter.Range)it).getFrom();
			int to = ((UnicodeCharacter.Range)it).getTo();
			List<UnicodeDisplayable> list
			    = new ArrayList<UnicodeDisplayable>(db.countRange(from,to));
			for ( UnicodeCharacter ch : db.getRange(from,to) )
			    list.add(ch);
			UnicodeArrayAdapter adapter
			    = new UnicodeArrayAdapter(UnicodeMapActivity.this,
						      list);
			stack.add(adapter);
			positionStack.add(position);
			positionYStack.add(view.getTop());
			setListAdapter(adapter);
		    } else
			throw new AssertionError("unknown UnicodeDisplayable");
		}
	    });
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
	if ( ( keyCode == KeyEvent.KEYCODE_BACK) && stack.size() > 1 ) {
	    final ListView lv = getListView();
	    stack.remove(stack.size()-1);
	    setListAdapter(stack.get(stack.size()-1));
	    lv.setSelectionFromTop(positionStack.remove(positionStack.size()-1),
				   positionYStack.remove(positionYStack.size()-1));
	    return true;
	}
	return super.onKeyDown(keyCode, event);
    }

}