package eu.siacs.conversations.ui;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import net.java.otr4j.session.SessionStatus;
import eu.siacs.conversations.R;
import eu.siacs.conversations.crypto.PgpEngine;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.entities.Contact;
import eu.siacs.conversations.entities.Conversation;
import eu.siacs.conversations.entities.Message;
import eu.siacs.conversations.entities.MucOptions;
import eu.siacs.conversations.services.XmppConnectionService;
import eu.siacs.conversations.ui.XmppActivity.OnPresenceSelected;
import eu.siacs.conversations.ui.adapter.MessageAdapter;
import eu.siacs.conversations.ui.adapter.MessageAdapter.OnContactPictureClicked;
import eu.siacs.conversations.utils.UIHelper;
import android.app.AlertDialog;
import android.app.Fragment;
import android.app.PendingIntent;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentSender;
import android.content.SharedPreferences;
import android.content.IntentSender.SendIntentException;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.text.Editable;
import android.text.Selection;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AbsListView;

import android.widget.EditText;
import android.widget.ListView;
import android.widget.ImageButton;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

public class ConversationFragment extends Fragment {

	protected Conversation conversation;
	protected ListView messagesView;
	protected LayoutInflater inflater;
	protected List<Message> messageList = new ArrayList<Message>();
	protected MessageAdapter messageListAdapter;
	protected Contact contact;

	protected String queuedPqpMessage = null;

	private EditText chatMsg;
	private String pastedText = null;
	private RelativeLayout snackbar;
	private TextView snackbarMessage;
	private TextView snackbarAction;

	private boolean useSubject = true;
	private boolean messagesLoaded = false;

	private IntentSender askForPassphraseIntent = null;

	private OnClickListener sendMsgListener = new OnClickListener() {

		@Override
		public void onClick(View v) {
			if (chatMsg.getText().length() < 1)
				return;
			Message message = new Message(conversation, chatMsg.getText()
					.toString(), conversation.getNextEncryption());
			if (conversation.getNextEncryption() == Message.ENCRYPTION_OTR) {
				sendOtrMessage(message);
			} else if (conversation.getNextEncryption() == Message.ENCRYPTION_PGP) {
				sendPgpMessage(message);
			} else {
				sendPlainTextMessage(message);
			}
		}
	};
	protected OnClickListener clickToDecryptListener = new OnClickListener() {

		@Override
		public void onClick(View v) {
			if (activity.hasPgp() && askForPassphraseIntent != null) {
				try {
					getActivity().startIntentSenderForResult(
							askForPassphraseIntent,
							ConversationActivity.REQUEST_DECRYPT_PGP, null, 0,
							0, 0);
				} catch (SendIntentException e) {
					//
				}
			}
		}
	};

	private OnClickListener clickToMuc = new OnClickListener() {

		@Override
		public void onClick(View v) {
			Intent intent = new Intent(getActivity(),
					ConferenceDetailsActivity.class);
			intent.setAction(ConferenceDetailsActivity.ACTION_VIEW_MUC);
			intent.putExtra("uuid", conversation.getUuid());
			startActivity(intent);
		}
	};

	private OnClickListener leaveMuc = new OnClickListener() {

		@Override
		public void onClick(View v) {
			activity.endConversation(conversation);
		}
	};

	private OnScrollListener mOnScrollListener = new OnScrollListener() {

		@Override
		public void onScrollStateChanged(AbsListView view, int scrollState) {
			// TODO Auto-generated method stub

		}

		@Override
		public void onScroll(AbsListView view, int firstVisibleItem,
				int visibleItemCount, int totalItemCount) {
			if (firstVisibleItem == 0 && messagesLoaded) {
				long timestamp = messageList.get(0).getTimeSent();
				messagesLoaded = false;
				List<Message> messages = activity.xmppConnectionService
						.getMoreMessages(conversation, timestamp);
				messageList.addAll(0, messages);
				messageListAdapter.notifyDataSetChanged();
				if (messages.size() != 0) {
					messagesLoaded = true;
				}
				messagesView.setSelectionFromTop(messages.size() + 1, 0);
			}
		}
	};

	private ConversationActivity activity;

	public void updateChatMsgHint() {
		switch (conversation.getNextEncryption()) {
		case Message.ENCRYPTION_NONE:
			chatMsg.setHint(getString(R.string.send_plain_text_message));
			break;
		case Message.ENCRYPTION_OTR:
			chatMsg.setHint(getString(R.string.send_otr_message));
			break;
		case Message.ENCRYPTION_PGP:
			chatMsg.setHint(getString(R.string.send_pgp_message));
			break;
		default:
			break;
		}
	}

	@Override
	public View onCreateView(final LayoutInflater inflater,
			ViewGroup container, Bundle savedInstanceState) {
		final View view = inflater.inflate(R.layout.fragment_conversation,
				container, false);
		chatMsg = (EditText) view.findViewById(R.id.textinput);
		chatMsg.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				if (activity.getSlidingPaneLayout().isSlideable()) {
					activity.getSlidingPaneLayout().closePane();
				}
			}
		});

		ImageButton sendButton = (ImageButton) view
				.findViewById(R.id.textSendButton);
		sendButton.setOnClickListener(this.sendMsgListener);

		snackbar = (RelativeLayout) view.findViewById(R.id.snackbar);
		snackbarMessage = (TextView) view.findViewById(R.id.snackbar_message);
		snackbarAction = (TextView) view.findViewById(R.id.snackbar_action);

		messagesView = (ListView) view.findViewById(R.id.messages_view);
		messagesView.setOnScrollListener(mOnScrollListener);
		messagesView.setTranscriptMode(ListView.TRANSCRIPT_MODE_NORMAL);
		messageListAdapter = new MessageAdapter((ConversationActivity) getActivity(), this.messageList);
		messageListAdapter.setOnContactPictureClicked(new OnContactPictureClicked() {
			
			@Override
			public void onContactPictureClicked(Message message) {
				if (message.getConversation().getMode() == Conversation.MODE_MULTI) {
					highlightInConference(message.getCounterpart());
				}
			}
		});
		messagesView.setAdapter(messageListAdapter);

		return view;
	}

	protected void highlightInConference(String nick) {
		String oldString = chatMsg.getText().toString().trim();
		if (oldString.isEmpty()) {
			chatMsg.setText(nick + ": ");
		} else {
			chatMsg.setText(oldString + " " + nick + " ");
		}
		int position = chatMsg.length();
		Editable etext = chatMsg.getText();
		Selection.setSelection(etext, position);
	}

	@Override
	public void onStart() {
		super.onStart();
		this.activity = (ConversationActivity) getActivity();
		SharedPreferences preferences = PreferenceManager
				.getDefaultSharedPreferences(activity);
		this.useSubject = preferences.getBoolean("use_subject_in_muc", true);
		if (activity.xmppConnectionServiceBound) {
			this.onBackendConnected();
		}
	}

	@Override
	public void onStop() {
		super.onStop();
		if (this.conversation != null) {
			this.conversation.setNextMessage(chatMsg.getText().toString());
		}
	}

	public void onBackendConnected() {
		this.conversation = activity.getSelectedConversation();
		if (this.conversation == null) {
			return;
		}
		String oldString = conversation.getNextMessage().trim();
		if (this.pastedText == null) {
			this.chatMsg.setText(oldString);
		} else {

			if (oldString.isEmpty()) {
				chatMsg.setText(pastedText);
			} else {
				chatMsg.setText(oldString + " " + pastedText);
			}
			pastedText = null;
		}
		int position = chatMsg.length();
		Editable etext = chatMsg.getText();
		Selection.setSelection(etext, position);
		updateMessages();
		if (activity.getSlidingPaneLayout().isSlideable()) {
			if (!activity.shouldPaneBeOpen()) {
				activity.getSlidingPaneLayout().closePane();
				activity.getActionBar().setDisplayHomeAsUpEnabled(true);
				activity.getActionBar().setHomeButtonEnabled(true);
				activity.getActionBar().setTitle(
						conversation.getName(useSubject));
				activity.invalidateOptionsMenu();
			}
		}
	}

	private void decryptMessage(Message message) {
		PgpEngine engine = activity.xmppConnectionService.getPgpEngine();
		if (engine != null) {
			engine.decrypt(message, new UiCallback<Message>() {

				@Override
				public void userInputRequried(PendingIntent pi, Message message) {
					askForPassphraseIntent = pi.getIntentSender();
					showSnackbar(R.string.openpgp_messages_found,
							R.string.decrypt, clickToDecryptListener);
				}

				@Override
				public void success(Message message) {
					activity.xmppConnectionService.databaseBackend
							.updateMessage(message);
					updateMessages();
				}

				@Override
				public void error(int error, Message message) {
					message.setEncryption(Message.ENCRYPTION_DECRYPTION_FAILED);
					// updateMessages();
				}
			});
		}
	}

	public void updateMessages() {
		if (getView() == null) {
			return;
		}
		hideSnackbar();
		final ConversationActivity activity = (ConversationActivity) getActivity();
		if (this.conversation != null) {
			final Contact contact = this.conversation.getContact();
			if (!contact.showInRoster() && contact.getOption(Contact.Options.PENDING_SUBSCRIPTION_REQUEST)) {
				showSnackbar(R.string.contact_added_you, R.string.add_back, new OnClickListener() {
					
					@Override
					public void onClick(View v) {
						activity.xmppConnectionService.createContact(contact);
						activity.switchToContactDetails(contact);
					}
				});
			}
			for (Message message : this.conversation.getMessages()) {
				if ((message.getEncryption() == Message.ENCRYPTION_PGP)
						&& ((message.getStatus() == Message.STATUS_RECIEVED) || (message
								.getStatus() == Message.STATUS_SEND))) {
					decryptMessage(message);
					break;
				}
			}
			if (this.conversation.getMessages().size() == 0) {
				this.messageList.clear();
				messagesLoaded = false;
			} else {
				for (Message message : this.conversation.getMessages()) {
					if (!this.messageList.contains(message)) {
						this.messageList.add(message);
					}
				}
				messagesLoaded = true;
				updateStatusMessages();
			}
			this.messageListAdapter.notifyDataSetChanged();
			if (conversation.getMode() == Conversation.MODE_SINGLE) {
				if (messageList.size() >= 1) {
					makeFingerprintWarning(conversation.getLatestEncryption());
				}
			} else {
				if (!conversation.getMucOptions().online()
						&& conversation.getAccount().getStatus() == Account.STATUS_ONLINE) {
					if (conversation.getMucOptions().getError() == MucOptions.ERROR_NICK_IN_USE) {
						showSnackbar(R.string.nick_in_use, R.string.edit,
								clickToMuc);
					} else if (conversation.getMucOptions().getError() == MucOptions.ERROR_ROOM_NOT_FOUND) {
						showSnackbar(R.string.conference_not_found,
								R.string.leave, leaveMuc);
					}
				}
			}
			getActivity().invalidateOptionsMenu();
			updateChatMsgHint();
			if (!activity.shouldPaneBeOpen()) {
				activity.xmppConnectionService.markRead(conversation);
				// TODO update notifications
				UIHelper.updateNotification(getActivity(),
						activity.getConversationList(), null, false);
				activity.updateConversationList();
			}
		}
	}

	private void messageSent() {
		int size = this.messageList.size();
		if (size >= 1) {
			messagesView.setSelection(size - 1);
		}
		chatMsg.setText("");
	}

	protected void updateStatusMessages() {
		boolean addedStatusMsg = false;
		if (conversation.getMode() == Conversation.MODE_SINGLE) {
			for (int i = this.messageList.size() - 1; i >= 0; --i) {
				if (addedStatusMsg) {
					if (this.messageList.get(i).getType() == Message.TYPE_STATUS) {
						this.messageList.remove(i);
						--i;
					}
				} else {
					if (this.messageList.get(i).getStatus() == Message.STATUS_RECIEVED) {
						addedStatusMsg = true;
					} else {
						if (this.messageList.get(i).getStatus() == Message.STATUS_SEND_DISPLAYED) {
							this.messageList.add(i + 1,
									Message.createStatusMessage(conversation));
							addedStatusMsg = true;
						}
					}
				}
			}
		}
	}

	protected void makeFingerprintWarning(int latestEncryption) {
		Set<String> knownFingerprints = conversation.getContact()
				.getOtrFingerprints();
		if ((latestEncryption == Message.ENCRYPTION_OTR)
				&& (conversation.hasValidOtrSession()
						&& (conversation.getOtrSession().getSessionStatus() == SessionStatus.ENCRYPTED) && (!knownFingerprints
							.contains(conversation.getOtrFingerprint())))) {
			showSnackbar(R.string.unknown_otr_fingerprint, R.string.verify,
					new OnClickListener() {

						@Override
						public void onClick(View v) {
							if (conversation.getOtrFingerprint() != null) {
								AlertDialog dialog = UIHelper
										.getVerifyFingerprintDialog(
												(ConversationActivity) getActivity(),
												conversation, snackbar);
								dialog.show();
							}
						}
					});
		}
	}

	protected void showSnackbar(int message, int action,
			OnClickListener clickListener) {
		snackbar.setVisibility(View.VISIBLE);
		snackbarMessage.setText(message);
		snackbarAction.setText(action);
		snackbarAction.setOnClickListener(clickListener);
	}

	protected void hideSnackbar() {
		snackbar.setVisibility(View.GONE);
	}

	protected void sendPlainTextMessage(Message message) {
		ConversationActivity activity = (ConversationActivity) getActivity();
		activity.xmppConnectionService.sendMessage(message);
		messageSent();
	}

	protected void sendPgpMessage(final Message message) {
		final ConversationActivity activity = (ConversationActivity) getActivity();
		final XmppConnectionService xmppService = activity.xmppConnectionService;
		final Contact contact = message.getConversation().getContact();
		if (activity.hasPgp()) {
			if (conversation.getMode() == Conversation.MODE_SINGLE) {
				if (contact.getPgpKeyId() != 0) {
					xmppService.getPgpEngine().hasKey(contact,
							new UiCallback<Contact>() {

								@Override
								public void userInputRequried(PendingIntent pi,
										Contact contact) {
									activity.runIntent(
											pi,
											ConversationActivity.REQUEST_ENCRYPT_MESSAGE);
								}

								@Override
								public void success(Contact contact) {
									messageSent();
									activity.encryptTextMessage(message);
								}

								@Override
								public void error(int error, Contact contact) {

								}
							});

				} else {
					showNoPGPKeyDialog(false,
							new DialogInterface.OnClickListener() {

								@Override
								public void onClick(DialogInterface dialog,
										int which) {
									conversation
											.setNextEncryption(Message.ENCRYPTION_NONE);
									message.setEncryption(Message.ENCRYPTION_NONE);
									xmppService.sendMessage(message);
									messageSent();
								}
							});
				}
			} else {
				if (conversation.getMucOptions().pgpKeysInUse()) {
					if (!conversation.getMucOptions().everybodyHasKeys()) {
						Toast warning = Toast
								.makeText(getActivity(),
										R.string.missing_public_keys,
										Toast.LENGTH_LONG);
						warning.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
						warning.show();
					}
					activity.encryptTextMessage(message);
					messageSent();
				} else {
					showNoPGPKeyDialog(true,
							new DialogInterface.OnClickListener() {

								@Override
								public void onClick(DialogInterface dialog,
										int which) {
									conversation
											.setNextEncryption(Message.ENCRYPTION_NONE);
									message.setEncryption(Message.ENCRYPTION_NONE);
									xmppService.sendMessage(message);
									messageSent();
								}
							});
				}
			}
		} else {
			activity.showInstallPgpDialog();
		}
	}

	public void showNoPGPKeyDialog(boolean plural,
			DialogInterface.OnClickListener listener) {
		AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
		builder.setIconAttribute(android.R.attr.alertDialogIcon);
		if (plural) {
			builder.setTitle(getString(R.string.no_pgp_keys));
			builder.setMessage(getText(R.string.contacts_have_no_pgp_keys));
		} else {
			builder.setTitle(getString(R.string.no_pgp_key));
			builder.setMessage(getText(R.string.contact_has_no_pgp_key));
		}
		builder.setNegativeButton(getString(R.string.cancel), null);
		builder.setPositiveButton(getString(R.string.send_unencrypted),
				listener);
		builder.create().show();
	}

	protected void sendOtrMessage(final Message message) {
		final ConversationActivity activity = (ConversationActivity) getActivity();
		final XmppConnectionService xmppService = activity.xmppConnectionService;
		if (conversation.hasValidOtrSession()) {
			activity.xmppConnectionService.sendMessage(message);
			messageSent();
		} else {
			activity.selectPresence(message.getConversation(),
					new OnPresenceSelected() {

						@Override
						public void onPresenceSelected() {
							message.setPresence(conversation.getNextPresence());
							xmppService.sendMessage(message);
							messageSent();
						}
					});
		}
	}

	public void setText(String text) {
		this.pastedText = text;
	}

	public void clearInputField() {
		this.chatMsg.setText("");
	}
}