/*
 * ConnectBot: simple, powerful, open-source SSH client for Android
 * Copyright 2007 Kenny Root, Jeffrey Sharkey
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.connectbot;

import java.util.List;

import org.connectbot.bean.HostBean;
import org.connectbot.bean.PortForwardBean;
import org.connectbot.service.TerminalBridge;
import org.connectbot.service.TerminalManager;
import org.connectbot.util.HostDatabase;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.res.Resources;
import android.database.SQLException;
import android.graphics.Paint;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.util.Log;
import android.view.ContextMenu;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.MenuItem.OnMenuItemClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;

/**
 * List all portForwards for a particular host and provide a way for users to add more portForwards,
 * edit existing portForwards, and delete portForwards.
 *
 * @author Kenny Root
 */
public class PortForwardListActivity extends ListActivity {
	public final static String TAG = "ConnectBot.PortForwardListActivity";

	private static final int LISTENER_CYCLE_TIME = 500;

	protected HostDatabase hostdb;

	private List<PortForwardBean> portForwards;

	private ServiceConnection connection = null;
	protected TerminalBridge hostBridge = null;
	protected LayoutInflater inflater = null;

	private HostBean host;

	@Override
	public void onStart() {
		super.onStart();

		this.bindService(new Intent(this, TerminalManager.class), connection, Context.BIND_AUTO_CREATE);

		if(this.hostdb == null)
			this.hostdb = new HostDatabase(this);
	}

	@Override
	public void onStop() {
		super.onStop();

		this.unbindService(connection);

		if(this.hostdb != null) {
			this.hostdb.close();
			this.hostdb = null;
		}
	}

	@Override
	public void onCreate(Bundle icicle) {
		super.onCreate(icicle);

		long hostId = this.getIntent().getLongExtra(Intent.EXTRA_TITLE, -1);

		setContentView(R.layout.act_portforwardlist);

		// connect with hosts database and populate list
		this.hostdb = new HostDatabase(this);
		host = hostdb.findHostById(hostId);

		{
			String nickname = host.getNickname();
			final Resources resources = getResources();

			if (nickname != null) {
				this.setTitle(String.format("%s: %s (%s)",
						resources.getText(R.string.app_name),
						resources.getText(R.string.title_port_forwards_list),
						nickname));
			} else {
				this.setTitle(String.format("%s: %s",
						resources.getText(R.string.app_name),
						resources.getText(R.string.title_port_forwards_list)));
			}
		}

		connection = new ServiceConnection() {
			public void onServiceConnected(ComponentName className, IBinder service) {
				TerminalManager bound = ((TerminalManager.TerminalBinder) service).getService();

				hostBridge = bound.getConnectedBridge(host);
				updateHandler.sendEmptyMessage(-1);
			}

			public void onServiceDisconnected(ComponentName name) {
				hostBridge = null;
			}
		};

		this.updateList();

		this.registerForContextMenu(this.getListView());

		this.getListView().setOnItemClickListener(new OnItemClickListener() {
			public void onItemClick(AdapterView<?> adapter, View view, int position, long id) {
				ListView lv = PortForwardListActivity.this.getListView();
				PortForwardBean pfb = (PortForwardBean) lv.getItemAtPosition(position);

				if (hostBridge != null) {
					if (pfb.isEnabled())
						hostBridge.disablePortForward(pfb);
					else {
						if (!hostBridge.enablePortForward(pfb))
							Toast.makeText(PortForwardListActivity.this, getString(R.string.portforward_problem), Toast.LENGTH_LONG).show();
					}

					updateHandler.sendEmptyMessage(-1);
				}
			}
		});

		this.inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		super.onCreateOptionsMenu(menu);

		MenuItem add = menu.add(R.string.portforward_menu_add);
		add.setIcon(android.R.drawable.ic_menu_add);
		add.setOnMenuItemClickListener(new OnMenuItemClickListener() {
			public boolean onMenuItemClick(MenuItem item) {
				// build dialog to prompt user about updating
				final View portForwardView = inflater.inflate(R.layout.dia_portforward, null, false);
				final EditText destEdit = (EditText) portForwardView.findViewById(R.id.portforward_destination);
				final Spinner typeSpinner = (Spinner)portForwardView.findViewById(R.id.portforward_type);

				typeSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
					public void onItemSelected(AdapterView<?> value, View view,
							int position, long id) {
						destEdit.setEnabled(position != 2);
					}
					public void onNothingSelected(AdapterView<?> arg0) {
					}
				});

				new AlertDialog.Builder(PortForwardListActivity.this)
					.setView(portForwardView)
					.setPositiveButton(R.string.portforward_pos, new DialogInterface.OnClickListener() {
						public void onClick(DialogInterface dialog, int which) {
							try {
								final EditText nicknameEdit = (EditText) portForwardView.findViewById(R.id.nickname);
								final EditText sourcePortEdit = (EditText) portForwardView.findViewById(R.id.portforward_source);

								String type = HostDatabase.PORTFORWARD_LOCAL;
								switch (typeSpinner.getSelectedItemPosition()) {
								case 0:
									type = HostDatabase.PORTFORWARD_LOCAL;
									break;
								case 1:
									type = HostDatabase.PORTFORWARD_REMOTE;
									break;
								case 2:
									type = HostDatabase.PORTFORWARD_DYNAMIC5;
									break;
								}

								PortForwardBean pfb = new PortForwardBean(host.getId(),
										nicknameEdit.getText().toString(), type,
										sourcePortEdit.getText().toString(),
										destEdit.getText().toString());

								if (hostBridge != null) {
									hostBridge.addPortForward(pfb);
									hostBridge.enablePortForward(pfb);
								}

								if (!hostdb.savePortForward(pfb))
									throw new SQLException("Could not save port forward");

								updateHandler.sendEmptyMessage(-1);
							} catch (Exception e) {
								Log.e(TAG, "Could not update port forward", e);
								// TODO Show failure dialog.
							}
						}
					})
					.setNegativeButton(R.string.delete_neg, null).create().show();

				return true;
			}
		});

		return true;
	}

	@Override
	public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
		// Create menu to handle deleting and editing port forward
		AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;
		final PortForwardBean pfb = (PortForwardBean) this.getListView().getItemAtPosition(info.position);

		menu.setHeaderTitle(pfb.getNickname());

		MenuItem edit = menu.add(R.string.portforward_edit);
		edit.setOnMenuItemClickListener(new OnMenuItemClickListener() {
			public boolean onMenuItemClick(MenuItem item) {
				final View editTunnelView = inflater.inflate(R.layout.dia_portforward, null, false);

				final Spinner typeSpinner = (Spinner) editTunnelView.findViewById(R.id.portforward_type);
				if (HostDatabase.PORTFORWARD_LOCAL.equals(pfb.getType()))
					typeSpinner.setSelection(0);
				else if (HostDatabase.PORTFORWARD_REMOTE.equals(pfb.getType()))
					typeSpinner.setSelection(1);
				else
					typeSpinner.setSelection(2);

				final EditText nicknameEdit = (EditText) editTunnelView.findViewById(R.id.nickname);
				nicknameEdit.setText(pfb.getNickname());

				final EditText sourcePortEdit = (EditText) editTunnelView.findViewById(R.id.portforward_source);
				sourcePortEdit.setText(String.valueOf(pfb.getSourcePort()));

				final EditText destEdit = (EditText) editTunnelView.findViewById(R.id.portforward_destination);
				if (HostDatabase.PORTFORWARD_DYNAMIC5.equals(pfb.getType())) {
					destEdit.setEnabled(false);
				} else {
					destEdit.setText(String.format("%s:%d", pfb.getDestAddr(), pfb.getDestPort()));
				}

				typeSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
					public void onItemSelected(AdapterView<?> value, View view,
							int position, long id) {
						destEdit.setEnabled(position != 2);
					}
					public void onNothingSelected(AdapterView<?> arg0) {
					}
				});

				new AlertDialog.Builder(PortForwardListActivity.this)
					.setView(editTunnelView)
					.setPositiveButton(R.string.button_change, new DialogInterface.OnClickListener() {
						public void onClick(DialogInterface dialog, int which) {
							try {
								if (hostBridge != null)
									hostBridge.disablePortForward(pfb);

								pfb.setNickname(nicknameEdit.getText().toString());

								switch (typeSpinner.getSelectedItemPosition()) {
								case 0:
									pfb.setType(HostDatabase.PORTFORWARD_LOCAL);
									break;
								case 1:
									pfb.setType(HostDatabase.PORTFORWARD_REMOTE);
									break;
								case 2:
									pfb.setType(HostDatabase.PORTFORWARD_DYNAMIC5);
									break;
								}

								pfb.setSourcePort(Integer.parseInt(sourcePortEdit.getText().toString()));
								pfb.setDest(destEdit.getText().toString());

								// Use the new settings for the existing connection.
								if (hostBridge != null)
									updateHandler.postDelayed(new Runnable() {
										public void run() {
											hostBridge.enablePortForward(pfb);
											updateHandler.sendEmptyMessage(-1);
										}
									}, LISTENER_CYCLE_TIME);


								if (!hostdb.savePortForward(pfb))
									throw new SQLException("Could not save port forward");

								updateHandler.sendEmptyMessage(-1);
							} catch (Exception e) {
								Log.e(TAG, "Could not update port forward", e);
								// TODO Show failure dialog.
							}
						}
					})
					.setNegativeButton(android.R.string.cancel, null).create().show();

				return true;
			}
		});

		MenuItem delete = menu.add(R.string.portforward_delete);
		delete.setOnMenuItemClickListener(new OnMenuItemClickListener() {
			public boolean onMenuItemClick(MenuItem item) {
				// prompt user to make sure they really want this
				new AlertDialog.Builder(PortForwardListActivity.this)
					.setMessage(getString(R.string.delete_message, pfb.getNickname()))
					.setPositiveButton(R.string.delete_pos, new DialogInterface.OnClickListener() {
						public void onClick(DialogInterface dialog, int which) {
							try {
								// Delete the port forward from the host if needed.
								if (hostBridge != null)
									hostBridge.removePortForward(pfb);

								hostdb.deletePortForward(pfb);
							} catch (Exception e) {
								Log.e(TAG, "Could not delete port forward", e);
							}

							updateHandler.sendEmptyMessage(-1);
						}
					})
					.setNegativeButton(R.string.delete_neg, null).create().show();

				return true;
			}
		});
	}

	protected Handler updateHandler = new Handler() {
		@Override
		public void handleMessage(Message msg) {
			PortForwardListActivity.this.updateList();
		}
	};

	protected void updateList() {
		if (hostBridge != null) {
			this.portForwards = hostBridge.getPortForwards();
		} else {
			if (this.hostdb == null) return;
			this.portForwards = this.hostdb.getPortForwardsForHost(host);
		}

		PortForwardAdapter adapter = new PortForwardAdapter(this, portForwards);

		this.setListAdapter(adapter);
	}

	class PortForwardAdapter extends ArrayAdapter<PortForwardBean> {
		class ViewHolder {
			public TextView nickname;
			public TextView caption;
		}

		private List<PortForwardBean> portForwards;

		public PortForwardAdapter(Context context, List<PortForwardBean> portForwards) {
			super(context, R.layout.item_portforward, portForwards);

			this.portForwards = portForwards;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			ViewHolder holder;

			if (convertView == null) {
				convertView = inflater.inflate(R.layout.item_portforward, null, false);

				holder = new ViewHolder();
				holder.nickname = (TextView)convertView.findViewById(android.R.id.text1);
				holder.caption = (TextView)convertView.findViewById(android.R.id.text2);

				convertView.setTag(holder);
			} else
				holder = (ViewHolder) convertView.getTag();

			PortForwardBean pfb = portForwards.get(position);
			holder.nickname.setText(pfb.getNickname());
			holder.caption.setText(pfb.getDescription());

			if (hostBridge != null && !pfb.isEnabled()) {
				holder.nickname.setPaintFlags(holder.nickname.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
				holder.caption.setPaintFlags(holder.caption.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
			}

			return convertView;
		}
	}
}
