package eu.siacs.conversations.ui;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import org.whispersystems.libaxolotl.IdentityKey;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import eu.siacs.conversations.R;
import eu.siacs.conversations.crypto.axolotl.AxolotlService;
import eu.siacs.conversations.crypto.axolotl.XmppAxolotlSession;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.entities.Contact;
import eu.siacs.conversations.xmpp.OnKeyStatusUpdated;
import eu.siacs.conversations.xmpp.jid.InvalidJidException;
import eu.siacs.conversations.xmpp.jid.Jid;

public class TrustKeysActivity extends XmppActivity implements OnKeyStatusUpdated {
	private Jid accountJid;
	private Jid contactJid;

	private Contact contact;
	private Account mAccount;
	private TextView keyErrorMessage;
	private LinearLayout keyErrorMessageCard;
	private TextView ownKeysTitle;
	private LinearLayout ownKeys;
	private LinearLayout ownKeysCard;
	private TextView foreignKeysTitle;
	private LinearLayout foreignKeys;
	private LinearLayout foreignKeysCard;
	private Button mSaveButton;
	private Button mCancelButton;

	private AxolotlService.FetchStatus lastFetchReport = AxolotlService.FetchStatus.SUCCESS;

	private final Map<String, Boolean> ownKeysToTrust = new HashMap<>();
	private final Map<String, Boolean> foreignKeysToTrust = new HashMap<>();

	private final OnClickListener mSaveButtonListener = new OnClickListener() {
		@Override
		public void onClick(View v) {
			commitTrusts();
			finishOk();
		}
	};

	private final OnClickListener mCancelButtonListener = new OnClickListener() {
		@Override
		public void onClick(View v) {
			setResult(RESULT_CANCELED);
			finish();
		}
	};

	@Override
	protected void refreshUiReal() {
		invalidateOptionsMenu();
		populateView();
	}

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

	@Override
	protected void onCreate(final Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_trust_keys);
		try {
			this.accountJid = Jid.fromString(getIntent().getExtras().getString(EXTRA_ACCOUNT));
		} catch (final InvalidJidException ignored) {
		}
		try {
			this.contactJid = Jid.fromString(getIntent().getExtras().getString("contact"));
		} catch (final InvalidJidException ignored) {
		}

		keyErrorMessageCard = (LinearLayout) findViewById(R.id.key_error_message_card);
		keyErrorMessage = (TextView) findViewById(R.id.key_error_message);
		ownKeysTitle = (TextView) findViewById(R.id.own_keys_title);
		ownKeys = (LinearLayout) findViewById(R.id.own_keys_details);
		ownKeysCard = (LinearLayout) findViewById(R.id.own_keys_card);
		foreignKeysTitle = (TextView) findViewById(R.id.foreign_keys_title);
		foreignKeys = (LinearLayout) findViewById(R.id.foreign_keys_details);
		foreignKeysCard = (LinearLayout) findViewById(R.id.foreign_keys_card);
		mCancelButton = (Button) findViewById(R.id.cancel_button);
		mCancelButton.setOnClickListener(mCancelButtonListener);
		mSaveButton = (Button) findViewById(R.id.save_button);
		mSaveButton.setOnClickListener(mSaveButtonListener);


		if (getActionBar() != null) {
			getActionBar().setHomeButtonEnabled(true);
			getActionBar().setDisplayHomeAsUpEnabled(true);
		}
	}

	private void populateView() {
		setTitle(getString(R.string.trust_omemo_fingerprints));
		ownKeys.removeAllViews();
		foreignKeys.removeAllViews();
		boolean hasOwnKeys = false;
		boolean hasForeignKeys = false;
		for(final String fingerprint : ownKeysToTrust.keySet()) {
			hasOwnKeys = true;
			addFingerprintRowWithListeners(ownKeys, contact.getAccount(), fingerprint, false,
					XmppAxolotlSession.Trust.fromBoolean(ownKeysToTrust.get(fingerprint)), false,
					new CompoundButton.OnCheckedChangeListener() {
						@Override
						public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
							ownKeysToTrust.put(fingerprint, isChecked);
							// own fingerprints have no impact on locked status.
						}
					},
					null,
					null
			);
		}
		for(final String fingerprint : foreignKeysToTrust.keySet()) {
			hasForeignKeys = true;
			addFingerprintRowWithListeners(foreignKeys, contact.getAccount(), fingerprint, false,
					XmppAxolotlSession.Trust.fromBoolean(foreignKeysToTrust.get(fingerprint)), false,
					new CompoundButton.OnCheckedChangeListener() {
						@Override
						public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
							foreignKeysToTrust.put(fingerprint, isChecked);
							lockOrUnlockAsNeeded();
						}
					},
					null,
					null
			);
		}

		if(hasOwnKeys) {
			ownKeysTitle.setText(accountJid.toString());
			ownKeysCard.setVisibility(View.VISIBLE);
		}
		if(hasForeignKeys) {
			foreignKeysTitle.setText(contactJid.toString());
			foreignKeysCard.setVisibility(View.VISIBLE);
		}
		if(hasPendingKeyFetches()) {
			setFetching();
			lock();
		} else {
			if (!hasForeignKeys && hasNoOtherTrustedKeys()) {
				keyErrorMessageCard.setVisibility(View.VISIBLE);
				if (lastFetchReport == AxolotlService.FetchStatus.ERROR
						|| contact.getAccount().getAxolotlService().fetchMapHasErrors(contact)) {
					keyErrorMessage.setText(R.string.error_no_keys_to_trust_server_error);
				} else {
					keyErrorMessage.setText(R.string.error_no_keys_to_trust);
				}
				ownKeys.removeAllViews(); ownKeysCard.setVisibility(View.GONE);
				foreignKeys.removeAllViews(); foreignKeysCard.setVisibility(View.GONE);
			}
			lockOrUnlockAsNeeded();
			setDone();
		}
	}

	private boolean reloadFingerprints() {
		ownKeysToTrust.clear();
		foreignKeysToTrust.clear();
		AxolotlService service = this.mAccount.getAxolotlService();
		Set<IdentityKey> ownKeysSet = service.getKeysWithTrust(XmppAxolotlSession.Trust.UNDECIDED);
		Set<IdentityKey> foreignKeysSet = service.getKeysWithTrust(XmppAxolotlSession.Trust.UNDECIDED, contact);
		if (hasNoOtherTrustedKeys() && ownKeysSet.size() == 0) {
			foreignKeysSet.addAll(service.getKeysWithTrust(XmppAxolotlSession.Trust.UNTRUSTED, contact));
		}
		for(final IdentityKey identityKey : ownKeysSet) {
			if(!ownKeysToTrust.containsKey(identityKey)) {
				ownKeysToTrust.put(identityKey.getFingerprint().replaceAll("\\s", ""), false);
			}
		}
		for(final IdentityKey identityKey : foreignKeysSet) {
			if(!foreignKeysToTrust.containsKey(identityKey)) {
				foreignKeysToTrust.put(identityKey.getFingerprint().replaceAll("\\s", ""), false);
			}
		}
		return ownKeysSet.size() + foreignKeysSet.size() > 0;
	}

	@Override
	public void onBackendConnected() {
		if ((accountJid != null) && (contactJid != null)) {
			this.mAccount = xmppConnectionService.findAccountByJid(accountJid);
			if (this.mAccount == null) {
				return;
			}
			this.contact = this.mAccount.getRoster().getContact(contactJid);
			reloadFingerprints();
			populateView();
		}
	}

	private boolean hasNoOtherTrustedKeys() {
		return mAccount == null || mAccount.getAxolotlService().getNumTrustedKeys(contact) == 0;
	}

	private boolean hasPendingKeyFetches() {
		return mAccount != null && contact != null && mAccount.getAxolotlService().hasPendingKeyFetches(mAccount,contact);
	}


	@Override
	public void onKeyStatusUpdated(final AxolotlService.FetchStatus report) {
		if (report != null) {
			lastFetchReport = report;
			runOnUiThread(new Runnable() {
				@Override
				public void run() {
					switch (report) {
						case ERROR:
							Toast.makeText(TrustKeysActivity.this,R.string.error_fetching_omemo_key,Toast.LENGTH_SHORT).show();
							break;
						case SUCCESS_VERIFIED:
							Toast.makeText(TrustKeysActivity.this,R.string.verified_omemo_key_with_certificate,Toast.LENGTH_LONG).show();
							break;
					}
				}
			});

		}
		boolean keysToTrust = reloadFingerprints();
		if (keysToTrust || hasPendingKeyFetches() || hasNoOtherTrustedKeys()) {
			refreshUi();
		} else {
			runOnUiThread(new Runnable() {
				@Override
				public void run() {
					finishOk();
				}
			});

		}
	}

	private void finishOk() {
		Intent data = new Intent();
		data.putExtra("choice", getIntent().getIntExtra("choice", ConversationActivity.ATTACHMENT_CHOICE_INVALID));
		setResult(RESULT_OK, data);
		finish();
	}

	private void commitTrusts() {
		for(final String fingerprint :ownKeysToTrust.keySet()) {
			contact.getAccount().getAxolotlService().setFingerprintTrust(
					fingerprint,
					XmppAxolotlSession.Trust.fromBoolean(ownKeysToTrust.get(fingerprint)));
		}
		for(final String fingerprint:foreignKeysToTrust.keySet()) {
			contact.getAccount().getAxolotlService().setFingerprintTrust(
					fingerprint,
					XmppAxolotlSession.Trust.fromBoolean(foreignKeysToTrust.get(fingerprint)));
		}
	}

	private void unlock() {
		mSaveButton.setEnabled(true);
		mSaveButton.setTextColor(getPrimaryTextColor());
	}

	private void lock() {
		mSaveButton.setEnabled(false);
		mSaveButton.setTextColor(getSecondaryTextColor());
	}

	private void lockOrUnlockAsNeeded() {
		if (hasNoOtherTrustedKeys() && !foreignKeysToTrust.values().contains(true)){
			lock();
		} else {
			unlock();
		}
	}

	private void setDone() {
		mSaveButton.setText(getString(R.string.done));
	}

	private void setFetching() {
		mSaveButton.setText(getString(R.string.fetching_keys));
	}
}