package org.madore.android.unicodeMap;

import java.util.Arrays;
import java.util.List;
import java.util.ArrayList;
import java.util.Formatter;
import java.util.regex.Pattern;
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.ViewGroup;
import android.view.Window;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MenuInflater;
import android.view.KeyEvent;
import android.widget.*;
import android.text.ClipboardManager;
import android.app.ListActivity;
import android.app.Dialog;
import android.app.ProgressDialog;

public final class UnicodeMapActivity extends ListActivity {

    protected UnicodeDatabase db;

    protected class ViewHistory {
	public final UnicodeArrayAdapter adapter;
	public final int selPosition;
	public final int yOffset;
	public final CharSequence title;
	public ViewHistory(UnicodeArrayAdapter adapter,
			   int selPosition, int yOffset,
			   CharSequence title) {
	    this.adapter = adapter;
	    this.selPosition = selPosition;
	    this.yOffset = yOffset;
	    this.title = title;
	}
    }

    protected final List<ViewHistory> historyStack
	= new ArrayList<ViewHistory>(10);

    EditText textForm;

    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();
    }

    protected void saveView(View selView, int selPosition) {
	final ListView lv = getListView();
	lv.clearTextFilter();
	final UnicodeArrayAdapter adapter
	    = (UnicodeArrayAdapter) lv.getAdapter();
	final int yOffset;
	if ( selView != null )
	    yOffset = selView.getTop();
	else
	    yOffset = 0;
	CharSequence title = getTitle();
	historyStack.add(new ViewHistory(adapter, selPosition, yOffset,
					 title));
    }

    protected void saveView() {
	final ListView lv = getListView();
	lv.clearTextFilter();
	final UnicodeArrayAdapter adapter
	    = (UnicodeArrayAdapter) lv.getAdapter();
	int position = lv.getSelectedItemPosition();
	int position0 = lv.getFirstVisiblePosition();
	if ( position == AdapterView.INVALID_POSITION )
	    position = position0;
	View view = lv.getChildAt(position-position0);
	final int yOffset;
	if ( view != null )
	    yOffset = view.getTop();
	else
	    yOffset = 0;
	CharSequence title = getTitle();
	historyStack.add(new ViewHistory(adapter, position, yOffset,
					 title));
    }

    protected class MapItemClickListener
	implements AdapterView.OnItemClickListener,
		   AdapterView.OnItemLongClickListener {
	public void onItemClick(AdapterView<?> parent, View view,
				int position, long id) {
	    UnicodeDisplayable it
		= (UnicodeDisplayable)parent.getItemAtPosition(position);
	    if ( it instanceof UnicodeCharacter )
		textForm.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);
		saveView(view, position);
		setListAdapter(adapter);
		setTitle(String.format(getResources()
				       .getString(R.string.app_name_spec),
				       ((UnicodeCharacter.Range)it).getDescr()));
	    } else
		throw new AssertionError("unknown UnicodeDisplayable");
	}
	public boolean onItemLongClick(AdapterView<?> parent, View view,
				       int position, long id) {
	    UnicodeDisplayable it
		= (UnicodeDisplayable)parent.getItemAtPosition(position);
	    if ( it instanceof UnicodeCharacter ) {
		UnicodeCharacter itch = (UnicodeCharacter)it;
		Dialog dialog = new Dialog(UnicodeMapActivity.this);
		dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
		dialog.setOwnerActivity(UnicodeMapActivity.this);
		dialog.setContentView(R.layout.char_details);
		dialog.setCancelable(true);
		TextView text;
		text = (TextView) dialog.findViewById(R.id.detailsLabel);
		text.setText(itch.getLabel());
		text = (TextView) dialog.findViewById(R.id.encodingLabel);
		StringBuilder s = new StringBuilder();
		Formatter fmt = new Formatter(s);
		fmt.format("UTF-8:");
		byte[] bytes;
		bytes = UnicodeCharacter.toUtf8(itch.getChar());
		for ( int i=0 ; i<bytes.length ; i++ )
		    fmt.format(" 0x%02x", bytes[i]);
		fmt.format("\nUTF-16BE:");
		bytes = UnicodeCharacter.toUtf16(itch.getChar());
		for ( int i=0 ; i<bytes.length ; i++ )
		    fmt.format(" 0x%02x", bytes[i]);
		text.setText(new String(s));
		dialog.show();
		return true;
	    } else if ( it instanceof UnicodeCharacter.Range ) {
		UnicodeCharacter.Range itr = (UnicodeCharacter.Range)it;
		Dialog dialog = new Dialog(UnicodeMapActivity.this);
		dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
		dialog.setOwnerActivity(UnicodeMapActivity.this);
		dialog.setContentView(R.layout.range_details);
		dialog.setCancelable(true);
		TextView text;
		text = (TextView) dialog.findViewById(R.id.rangeDescrLabel);
		text.setText(itr.getDescr());
		text = (TextView) dialog.findViewById(R.id.rangeRangeLabel);
		StringBuilder s = new StringBuilder();
		Formatter fmt = new Formatter(s);
		fmt.format("%04X\u2013%04X (%d slots, %d chars)",
			   itr.getFrom(), itr.getTo()-1,
			   itr.getTo()-itr.getFrom(),
			   db.countRange(itr.getFrom(), itr.getTo()));
		text.setText(new String(s));
		dialog.show();
		return true;
	    } else
		throw new AssertionError("unknown UnicodeDisplayable");
	}
    }

    /** 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();
	List<UnicodeDisplayable> rootList
	    = new ArrayList<UnicodeDisplayable>(UnicodeCharacter.Range.values().length);
	for ( UnicodeCharacter.Range rng : UnicodeCharacter.Range.values() )
	    rootList.add(rng);
	UnicodeArrayAdapter rootAdapter
	    = new UnicodeArrayAdapter(this, rootList);
	setListAdapter(rootAdapter);
	final ClipboardManager cmgr
	    = (ClipboardManager)getSystemService(Context.CLIPBOARD_SERVICE);
	final Button btn = (Button) findViewById(R.id.copyButton);
	textForm = (EditText) findViewById(R.id.edit);
	btn.setOnClickListener(new View.OnClickListener() {
		public void onClick(View view) {
		    cmgr.setText(textForm.getText());
		    Toast.makeText(UnicodeMapActivity.this,
				   R.string.copied_toast,
				   Toast.LENGTH_SHORT).show();
		}
	    });
	final ListView lv = getListView();
	lv.setTextFilterEnabled(true);
	MapItemClickListener listener = new MapItemClickListener();
	lv.setOnItemClickListener(listener);
	lv.setOnItemLongClickListener(listener);
    }

    final static int searchLimit = 1000;

    protected void doSearch(String s) {
	List<UnicodeDisplayable> list
	    = new ArrayList<UnicodeDisplayable>(128);
	for ( UnicodeCharacter ch : db.searchNames(s,searchLimit+1) )
	    list.add(ch);
	boolean overflowed = ( list.size() > searchLimit );
	if ( overflowed )
	    list.remove(list.size()-1);
	UnicodeArrayAdapter adapter
	    = new UnicodeArrayAdapter(UnicodeMapActivity.this,
				      list);
	saveView();
	setListAdapter(adapter);
	setTitle(String.format(getResources()
			       .getString(R.string.app_name_spec),
			       getResources()
			       .getString(R.string.search_results)));
	if ( overflowed ) {
	    String str = getResources().getString(R.string.list_too_long);
	    android.util.Log.e("UnicodeMapActivity", "format is: "+str);
	    Toast.makeText(UnicodeMapActivity.this,
			   String.format(str, searchLimit),
			   Toast.LENGTH_SHORT).show();
	}
    }

    protected void querySearch() {
	final Dialog dialog = new Dialog(UnicodeMapActivity.this);
	// dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
	dialog.setTitle(R.string.search_title);
	dialog.setOwnerActivity(this);
	dialog.setContentView(R.layout.search_dialog);
	dialog.setCancelable(true);
	dialog.getWindow().setLayout(ViewGroup.LayoutParams.FILL_PARENT,
				     ViewGroup.LayoutParams.WRAP_CONTENT);
	final EditText textForm
	    = (EditText) dialog.findViewById(R.id.searchTerm);
	textForm.setOnKeyListener(new View.OnKeyListener() {
		public boolean onKey(View view, int keyCode, KeyEvent event) {
		    if ( ( event.getAction() == KeyEvent.ACTION_DOWN )
			 && ( keyCode == KeyEvent.KEYCODE_ENTER ) ) {
			String s = textForm.getText().toString();
			if ( ! Pattern.matches("^\\s*$", s) )
			    doSearch(s);
			dialog.dismiss();
			return true;
		    }
		    return false;
		}
	    });
	final Button btn = (Button) dialog.findViewById(R.id.searchButton);
	btn.setOnClickListener(new View.OnClickListener() {
		public void onClick(View view) {
		    String s = textForm.getText().toString();
		    if ( ! Pattern.matches("^\\s*$", s) ) {
			doSearch(s);
			dialog.dismiss();
		    }
		}
	    });
	dialog.show();
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
	if ( ( keyCode == KeyEvent.KEYCODE_BACK )
	     && historyStack.size() > 0 ) {
	    final ListView lv = getListView();
	    ViewHistory saved = historyStack.remove(historyStack.size()-1);
	    setListAdapter(saved.adapter);
	    setTitle(saved.title);
	    lv.setSelectionFromTop(saved.selPosition, saved.yOffset);
	    return true;
	} else if ( keyCode == KeyEvent.KEYCODE_SEARCH ) {
	    querySearch();
	    return true;
	}
	return super.onKeyDown(keyCode, event);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
	switch ( item.getItemId() ) {
	case R.id.menuSearch:
	    querySearch();
	    return true;
	default:
	    return super.onContextItemSelected(item);
	}
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
	MenuInflater inflater = getMenuInflater();
	inflater.inflate(R.menu.options_menu, menu);
	return true;
    }

}