package eu.siacs.conversations.ui;

import android.support.v7.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import net.java.otr4j.OtrException;
import net.java.otr4j.session.Session;

import eu.siacs.conversations.R;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.entities.Contact;
import eu.siacs.conversations.entities.Conversation;
import eu.siacs.conversations.services.XmppConnectionService;
import eu.siacs.conversations.utils.CryptoHelper;
import eu.siacs.conversations.utils.XmppUri;
import eu.siacs.conversations.utils.zxing.IntentIntegrator;
import eu.siacs.conversations.utils.zxing.IntentResult;
import eu.siacs.conversations.xmpp.jid.InvalidJidException;
import eu.siacs.conversations.xmpp.jid.Jid;

public class VerifyOTRActivity extends XmppActivity implements XmppConnectionService.OnConversationUpdate {

	public static final String ACTION_VERIFY_CONTACT = "verify_contact";
	public static final int MODE_SCAN_FINGERPRINT = - 0x0502;
	public static final int MODE_ASK_QUESTION = 0x0503;
	public static final int MODE_ANSWER_QUESTION = 0x0504;
	public static final int MODE_MANUAL_VERIFICATION = 0x0505;

	private LinearLayout mManualVerificationArea;
	private LinearLayout mSmpVerificationArea;
	private TextView mRemoteFingerprint;
	private TextView mYourFingerprint;
	private TextView mVerificationExplain;
	private TextView mStatusMessage;
	private TextView mSharedSecretHint;
	private EditText mSharedSecretHintEditable;
	private EditText mSharedSecretSecret;
	private Button mLeftButton;
	private Button mRightButton;
	private Account mAccount;
	private Conversation mConversation;
	private int mode = MODE_MANUAL_VERIFICATION;
	private XmppUri mPendingUri = null;

	private DialogInterface.OnClickListener mVerifyFingerprintListener = new DialogInterface.OnClickListener() {

		@Override
		public void onClick(DialogInterface dialogInterface, int click) {
			mConversation.verifyOtrFingerprint();
			xmppConnectionService.syncRosterToDisk(mConversation.getAccount());
			Toast.makeText(VerifyOTRActivity.this,R.string.verified,Toast.LENGTH_SHORT).show();
			finish();
		}
	};

	private View.OnClickListener mCreateSharedSecretListener = new View.OnClickListener() {
		@Override
		public void onClick(final View view) {
			if (isAccountOnline()) {
				final String question = mSharedSecretHintEditable.getText().toString();
				final String secret = mSharedSecretSecret.getText().toString();
				if (question.trim().isEmpty()) {
					mSharedSecretHintEditable.requestFocus();
					mSharedSecretHintEditable.setError(getString(R.string.shared_secret_hint_should_not_be_empty));
				} else if (secret.trim().isEmpty()) {
					mSharedSecretSecret.requestFocus();
					mSharedSecretSecret.setError(getString(R.string.shared_secret_can_not_be_empty));
				} else {
					mSharedSecretSecret.setError(null);
					mSharedSecretHintEditable.setError(null);
					initSmp(question, secret);
					updateView();
				}
			}
		}
	};
	private View.OnClickListener mCancelSharedSecretListener = new View.OnClickListener() {
		@Override
		public void onClick(View view) {
			if (isAccountOnline()) {
				abortSmp();
				updateView();
			}
		}
	};
	private View.OnClickListener mRespondSharedSecretListener = new View.OnClickListener() {

		@Override
		public void onClick(View view) {
			if (isAccountOnline()) {
				final String question = mSharedSecretHintEditable.getText().toString();
				final String secret = mSharedSecretSecret.getText().toString();
				respondSmp(question, secret);
				updateView();
			}
		}
	};
	private View.OnClickListener mRetrySharedSecretListener = new View.OnClickListener() {
		@Override
		public void onClick(View view) {
			mConversation.smp().status = Conversation.Smp.STATUS_NONE;
			mConversation.smp().hint = null;
			mConversation.smp().secret = null;
			updateView();
		}
	};
	private View.OnClickListener mFinishListener = new View.OnClickListener() {
		@Override
		public void onClick(View view) {
			mConversation.smp().status = Conversation.Smp.STATUS_NONE;
			finish();
		}
	};

	protected boolean initSmp(final String question, final String secret) {
		final Session session = mConversation.getOtrSession();
		if (session!=null) {
			try {
				session.initSmp(question, secret);
				mConversation.smp().status = Conversation.Smp.STATUS_WE_REQUESTED;
				mConversation.smp().secret = secret;
				mConversation.smp().hint = question;
				return true;
			} catch (OtrException e) {
				return false;
			}
		} else {
			return false;
		}
	}

	protected boolean abortSmp() {
		final Session session = mConversation.getOtrSession();
		if (session!=null) {
			try {
				session.abortSmp();
				mConversation.smp().status = Conversation.Smp.STATUS_NONE;
				mConversation.smp().hint = null;
				mConversation.smp().secret = null;
				return true;
			} catch (OtrException e) {
				return false;
			}
		} else {
			return false;
		}
	}

	protected boolean respondSmp(final String question, final String secret) {
		final Session session = mConversation.getOtrSession();
		if (session!=null) {
			try {
				session.respondSmp(question,secret);
				return true;
			} catch (OtrException e) {
				return false;
			}
		} else {
			return false;
		}
	}

	protected boolean verifyWithUri(XmppUri uri) {
		Contact contact = mConversation.getContact();
		if (this.mConversation.getContact().getJid().equals(uri.getJid()) && uri.hasFingerprints()) {
			xmppConnectionService.verifyFingerprints(contact,uri.getFingerprints());
			Toast.makeText(this,R.string.verified,Toast.LENGTH_SHORT).show();
			updateView();
			return true;
		} else {
			Toast.makeText(this,R.string.could_not_verify_fingerprint,Toast.LENGTH_SHORT).show();
			return false;
		}
	}

	protected boolean isAccountOnline() {
		if (this.mAccount.getStatus() != Account.State.ONLINE) {
			Toast.makeText(this,R.string.not_connected_try_again,Toast.LENGTH_SHORT).show();
			return false;
		} else {
			return true;
		}
	}

	protected boolean handleIntent(Intent intent) {
		if (intent != null && intent.getAction().equals(ACTION_VERIFY_CONTACT)) {
			this.mAccount = extractAccount(intent);
			if (this.mAccount == null) {
				return false;
			}
			try {
				this.mConversation = this.xmppConnectionService.find(this.mAccount,Jid.fromString(intent.getExtras().getString("contact")));
				if (this.mConversation == null) {
					return false;
				}
			} catch (final InvalidJidException ignored) {
				return false;
			}
			this.mode = intent.getIntExtra("mode", MODE_MANUAL_VERIFICATION);
			if (this.mode == MODE_SCAN_FINGERPRINT) {
				new IntentIntegrator(this).initiateScan();
				return false;
			}
			return true;
		} else {
			return false;
		}
	}

	@Override
	public void onActivityResult(int requestCode, int resultCode, Intent intent) {
		if ((requestCode & 0xFFFF) == IntentIntegrator.REQUEST_CODE) {
			IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
			if (scanResult != null && scanResult.getFormatName() != null) {
				String data = scanResult.getContents();
				XmppUri uri = new XmppUri(data);
				if (xmppConnectionServiceBound) {
					verifyWithUri(uri);
					finish();
				} else {
					this.mPendingUri = uri;
				}
			} else {
				finish();
			}
		}
		super.onActivityResult(requestCode, requestCode, intent);
	}

	@Override
	protected void onBackendConnected() {
		if (handleIntent(getIntent())) {
			updateView();
		} else if (mPendingUri!=null) {
			verifyWithUri(mPendingUri);
			finish();
			mPendingUri = null;
		}
		setIntent(null);
	}

	protected void updateView() {
		if (this.mConversation != null && this.mConversation.hasValidOtrSession()) {
			final ActionBar actionBar = getSupportActionBar();
			this.mVerificationExplain.setText(R.string.no_otr_session_found);
			invalidateOptionsMenu();
			switch(this.mode) {
				case MODE_ASK_QUESTION:
					if (actionBar != null ) {
						actionBar.setTitle(R.string.ask_question);
					}
					this.updateViewAskQuestion();
					break;
				case MODE_ANSWER_QUESTION:
					if (actionBar != null ) {
						actionBar.setTitle(R.string.smp_requested);
					}
					this.updateViewAnswerQuestion();
					break;
				case MODE_MANUAL_VERIFICATION:
				default:
					if (actionBar != null ) {
						actionBar.setTitle(R.string.manually_verify);
					}
					this.updateViewManualVerification();
					break;
			}
		} else {
			this.mManualVerificationArea.setVisibility(View.GONE);
			this.mSmpVerificationArea.setVisibility(View.GONE);
		}
	}

	protected void updateViewManualVerification() {
		this.mVerificationExplain.setText(R.string.manual_verification_explanation);
		this.mManualVerificationArea.setVisibility(View.VISIBLE);
		this.mSmpVerificationArea.setVisibility(View.GONE);
		this.mYourFingerprint.setText(CryptoHelper.prettifyFingerprint(this.mAccount.getOtrFingerprint()));
		this.mRemoteFingerprint.setText(CryptoHelper.prettifyFingerprint(this.mConversation.getOtrFingerprint()));
		if (this.mConversation.isOtrFingerprintVerified()) {
			deactivateButton(this.mRightButton,R.string.verified);
			activateButton(this.mLeftButton,R.string.cancel,this.mFinishListener);
		} else {
			activateButton(this.mLeftButton,R.string.cancel,this.mFinishListener);
			activateButton(this.mRightButton,R.string.verify, new View.OnClickListener() {
				@Override
				public void onClick(View view) {
					showManuallyVerifyDialog();
				}
			});
		}
	}

	protected void updateViewAskQuestion() {
		this.mManualVerificationArea.setVisibility(View.GONE);
		this.mSmpVerificationArea.setVisibility(View.VISIBLE);
		this.mVerificationExplain.setText(R.string.smp_explain_question);
		final int smpStatus = this.mConversation.smp().status;
		switch (smpStatus) {
			case Conversation.Smp.STATUS_WE_REQUESTED:
				this.mStatusMessage.setVisibility(View.GONE);
				this.mSharedSecretHintEditable.setVisibility(View.VISIBLE);
				this.mSharedSecretSecret.setVisibility(View.VISIBLE);
				this.mSharedSecretHintEditable.setText(this.mConversation.smp().hint);
				this.mSharedSecretSecret.setText(this.mConversation.smp().secret);
				this.activateButton(this.mLeftButton, R.string.cancel, this.mCancelSharedSecretListener);
				this.deactivateButton(this.mRightButton, R.string.in_progress);
				break;
			case Conversation.Smp.STATUS_FAILED:
				this.mStatusMessage.setVisibility(View.GONE);
				this.mSharedSecretHintEditable.setVisibility(View.VISIBLE);
				this.mSharedSecretSecret.setVisibility(View.VISIBLE);
				this.mSharedSecretSecret.requestFocus();
				this.mSharedSecretSecret.setError(getString(R.string.secrets_do_not_match));
				this.deactivateButton(this.mLeftButton, R.string.cancel);
				this.activateButton(this.mRightButton, R.string.try_again, this.mRetrySharedSecretListener);
				break;
			case Conversation.Smp.STATUS_VERIFIED:
				this.mSharedSecretHintEditable.setText("");
				this.mSharedSecretHintEditable.setVisibility(View.GONE);
				this.mSharedSecretSecret.setText("");
				this.mSharedSecretSecret.setVisibility(View.GONE);
				this.mStatusMessage.setVisibility(View.VISIBLE);
				this.deactivateButton(this.mLeftButton, R.string.cancel);
				this.activateButton(this.mRightButton, R.string.finish, this.mFinishListener);
				break;
			default:
				this.mStatusMessage.setVisibility(View.GONE);
				this.mSharedSecretHintEditable.setVisibility(View.VISIBLE);
				this.mSharedSecretSecret.setVisibility(View.VISIBLE);
				this.activateButton(this.mLeftButton,R.string.cancel,this.mFinishListener);
				this.activateButton(this.mRightButton, R.string.ask_question, this.mCreateSharedSecretListener);
				break;
		}
	}

	protected void updateViewAnswerQuestion() {
		this.mManualVerificationArea.setVisibility(View.GONE);
		this.mSmpVerificationArea.setVisibility(View.VISIBLE);
		this.mVerificationExplain.setText(R.string.smp_explain_answer);
		this.mSharedSecretHintEditable.setVisibility(View.GONE);
		this.mSharedSecretHint.setVisibility(View.VISIBLE);
		this.deactivateButton(this.mLeftButton, R.string.cancel);
		final int smpStatus = this.mConversation.smp().status;
		switch (smpStatus) {
			case Conversation.Smp.STATUS_CONTACT_REQUESTED:
				this.mStatusMessage.setVisibility(View.GONE);
				this.mSharedSecretHint.setText(this.mConversation.smp().hint);
				this.activateButton(this.mRightButton,R.string.respond,this.mRespondSharedSecretListener);
				break;
			case Conversation.Smp.STATUS_VERIFIED:
				this.mSharedSecretHintEditable.setText("");
				this.mSharedSecretHintEditable.setVisibility(View.GONE);
				this.mSharedSecretHint.setVisibility(View.GONE);
				this.mSharedSecretSecret.setText("");
				this.mSharedSecretSecret.setVisibility(View.GONE);
				this.mStatusMessage.setVisibility(View.VISIBLE);
				this.activateButton(this.mRightButton, R.string.finish, this.mFinishListener);
				break;
			case Conversation.Smp.STATUS_FAILED:
			default:
				this.mSharedSecretSecret.requestFocus();
				this.mSharedSecretSecret.setError(getString(R.string.secrets_do_not_match));
				this.activateButton(this.mRightButton,R.string.finish,this.mFinishListener);
				break;
		}
	}

	protected void activateButton(Button button, int text, View.OnClickListener listener) {
		button.setEnabled(true);
		button.setTextColor(getPrimaryTextColor());
		button.setText(text);
		button.setOnClickListener(listener);
	}

	protected void deactivateButton(Button button, int text) {
		button.setEnabled(false);
		button.setTextColor(getSecondaryTextColor());
		button.setText(text);
		button.setOnClickListener(null);
	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_verify_otr);
		this.mRemoteFingerprint = (TextView) findViewById(R.id.remote_fingerprint);
		this.mYourFingerprint = (TextView) findViewById(R.id.your_fingerprint);
		this.mLeftButton = (Button) findViewById(R.id.left_button);
		this.mRightButton = (Button) findViewById(R.id.right_button);
		this.mVerificationExplain = (TextView) findViewById(R.id.verification_explanation);
		this.mStatusMessage = (TextView) findViewById(R.id.status_message);
		this.mSharedSecretSecret = (EditText) findViewById(R.id.shared_secret_secret);
		this.mSharedSecretHintEditable = (EditText) findViewById(R.id.shared_secret_hint_editable);
		this.mSharedSecretHint = (TextView) findViewById(R.id.shared_secret_hint);
		this.mManualVerificationArea = (LinearLayout) findViewById(R.id.manual_verification_area);
		this.mSmpVerificationArea = (LinearLayout) findViewById(R.id.smp_verification_area);
	}

	@Override
	public boolean onCreateOptionsMenu(final Menu menu) {
		super.onCreateOptionsMenu(menu);
		getMenuInflater().inflate(R.menu.verify_otr, menu);
		return true;
	}

	private void showManuallyVerifyDialog() {
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setTitle(R.string.manually_verify);
		builder.setMessage(R.string.are_you_sure_verify_fingerprint);
		builder.setNegativeButton(R.string.cancel, null);
		builder.setPositiveButton(R.string.verify, mVerifyFingerprintListener);
		builder.create().show();
	}

	@Override
	protected String getShareableUri() {
		if (mAccount!=null) {
			return mAccount.getShareableUri();
		} else {
			return "";
		}
	}

	public void onConversationUpdate() {
		refreshUi();
	}

	@Override
	protected void refreshUiReal() {
		updateView();
	}
}