package eu.siacs.conversations.ui;

import android.app.ActionBar;
import android.app.AlertDialog;
import android.content.ActivityNotFoundException;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.os.Bundle;
import android.security.KeyChain;
import android.security.KeyChainAliasCallback;
import android.util.Pair;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;

import org.openintents.openpgp.util.OpenPgpApi;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;

import eu.siacs.conversations.Config;
import eu.siacs.conversations.R;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.services.XmppConnectionService;
import eu.siacs.conversations.services.XmppConnectionService.OnAccountUpdate;
import eu.siacs.conversations.ui.adapter.AccountAdapter;
import eu.siacs.conversations.xmpp.jid.InvalidJidException;
import eu.siacs.conversations.xmpp.jid.Jid;

public class ManageAccountActivity extends XmppActivity implements OnAccountUpdate, KeyChainAliasCallback, XmppConnectionService.OnAccountCreated {

	private final String STATE_SELECTED_ACCOUNT = "selected_account";

	protected Account selectedAccount = null;
	protected Jid selectedAccountJid = null;

	protected final List<Account> accountList = new ArrayList<>();
	protected ListView accountListView;
	protected AccountAdapter mAccountAdapter;
	protected AtomicBoolean mInvokedAddAccount = new AtomicBoolean(false);

	protected Pair<Integer, Intent> mPostponedActivityResult = null;

	@Override
	public void onAccountUpdate() {
		refreshUi();
	}

	@Override
	protected void refreshUiReal() {
		synchronized (this.accountList) {
			accountList.clear();
			accountList.addAll(xmppConnectionService.getAccounts());
		}
		ActionBar actionBar = getActionBar();
		if (actionBar != null) {
			actionBar.setHomeButtonEnabled(this.accountList.size() > 0);
			actionBar.setDisplayHomeAsUpEnabled(this.accountList.size() > 0);
		}
		invalidateOptionsMenu();
		mAccountAdapter.notifyDataSetChanged();
	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.manage_accounts);

		if (savedInstanceState != null) {
			String jid = savedInstanceState.getString(STATE_SELECTED_ACCOUNT);
			if (jid != null) {
				try {
					this.selectedAccountJid = Jid.fromString(jid);
				} catch (InvalidJidException e) {
					this.selectedAccountJid = null;
				}
			}
		}

		accountListView = (ListView) findViewById(R.id.account_list);
		this.mAccountAdapter = new AccountAdapter(this, accountList);
		accountListView.setAdapter(this.mAccountAdapter);
		accountListView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> arg0, View view,
									int position, long arg3) {
				switchToAccount(accountList.get(position));
			}
		});
		registerForContextMenu(accountListView);
	}

	@Override
	public void onSaveInstanceState(final Bundle savedInstanceState) {
		if (selectedAccount != null) {
			savedInstanceState.putString(STATE_SELECTED_ACCOUNT, selectedAccount.getJid().toBareJid().toString());
		}
		super.onSaveInstanceState(savedInstanceState);
	}

	@Override
	public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
		super.onCreateContextMenu(menu, v, menuInfo);
		ManageAccountActivity.this.getMenuInflater().inflate(
				R.menu.manageaccounts_context, menu);
		AdapterContextMenuInfo acmi = (AdapterContextMenuInfo) menuInfo;
		this.selectedAccount = accountList.get(acmi.position);
		if (this.selectedAccount.isOptionSet(Account.OPTION_DISABLED)) {
			menu.findItem(R.id.mgmt_account_disable).setVisible(false);
			menu.findItem(R.id.mgmt_account_announce_pgp).setVisible(false);
			menu.findItem(R.id.mgmt_account_publish_avatar).setVisible(false);
		} else {
			menu.findItem(R.id.mgmt_account_enable).setVisible(false);
			menu.findItem(R.id.mgmt_account_announce_pgp).setVisible(Config.supportOpenPgp());
		}
		menu.setHeaderTitle(this.selectedAccount.getJid().toBareJid().toString());
	}

	@Override
	void onBackendConnected() {
		if (selectedAccountJid != null) {
			this.selectedAccount = xmppConnectionService.findAccountByJid(selectedAccountJid);
		}
		refreshUiReal();
		if (this.mPostponedActivityResult != null) {
			this.onActivityResult(mPostponedActivityResult.first, RESULT_OK, mPostponedActivityResult.second);
		}
		if (Config.X509_VERIFICATION && this.accountList.size() == 0) {
			if (mInvokedAddAccount.compareAndSet(false, true)) {
				addAccountFromKey();
			}
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.manageaccounts, menu);
		MenuItem enableAll = menu.findItem(R.id.action_enable_all);
		MenuItem addAccount = menu.findItem(R.id.action_add_account);
		MenuItem addAccountWithCertificate = menu.findItem(R.id.action_add_account_with_cert);

		if (Config.X509_VERIFICATION) {
			addAccount.setVisible(false);
			addAccountWithCertificate.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
		} else {
			addAccount.setVisible(!Config.LOCK_SETTINGS);
		}
		addAccountWithCertificate.setVisible(!Config.LOCK_SETTINGS);

		if (!accountsLeftToEnable()) {
			enableAll.setVisible(false);
		}
		MenuItem disableAll = menu.findItem(R.id.action_disable_all);
		if (!accountsLeftToDisable()) {
			disableAll.setVisible(false);
		}
		return true;
	}

	@Override
	public boolean onContextItemSelected(MenuItem item) {
		switch (item.getItemId()) {
			case R.id.mgmt_account_publish_avatar:
				publishAvatar(selectedAccount);
				return true;
			case R.id.mgmt_account_disable:
				disableAccount(selectedAccount);
				return true;
			case R.id.mgmt_account_enable:
				enableAccount(selectedAccount);
				return true;
			case R.id.mgmt_account_delete:
				deleteAccount(selectedAccount);
				return true;
			case R.id.mgmt_account_announce_pgp:
				publishOpenPGPPublicKey(selectedAccount);
				return true;
			default:
				return super.onContextItemSelected(item);
		}
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
			case R.id.action_add_account:
				startActivity(new Intent(getApplicationContext(),
						EditAccountActivity.class));
				break;
			case R.id.action_disable_all:
				disableAllAccounts();
				break;
			case R.id.action_enable_all:
				enableAllAccounts();
				break;
			case R.id.action_add_account_with_cert:
				addAccountFromKey();
				break;
			default:
				break;
		}
		return super.onOptionsItemSelected(item);
	}

	@Override
	public boolean onNavigateUp() {
		if (xmppConnectionService.getConversations().size() == 0) {
			Intent contactsIntent = new Intent(this,
					StartConversationActivity.class);
			contactsIntent.setFlags(
					// if activity exists in stack, pop the stack and go back to it
					Intent.FLAG_ACTIVITY_CLEAR_TOP |
							// otherwise, make a new task for it
							Intent.FLAG_ACTIVITY_NEW_TASK |
							// don't use the new activity animation; finish
							// animation runs instead
							Intent.FLAG_ACTIVITY_NO_ANIMATION);
			startActivity(contactsIntent);
			finish();
			return true;
		} else {
			return super.onNavigateUp();
		}
	}

	public void onClickTglAccountState(Account account, boolean enable) {
		if (enable) {
			enableAccount(account);
		} else {
			disableAccount(account);
		}
	}

	private void addAccountFromKey() {
		try {
			KeyChain.choosePrivateKeyAlias(this, this, null, null, null, -1, null);
		} catch (ActivityNotFoundException e) {
			Toast.makeText(this, R.string.device_does_not_support_certificates, Toast.LENGTH_LONG).show();
		}
	}

	private void publishAvatar(Account account) {
		Intent intent = new Intent(getApplicationContext(),
				PublishProfilePictureActivity.class);
		intent.putExtra(EXTRA_ACCOUNT, account.getJid().toString());
		startActivity(intent);
	}

	private void disableAllAccounts() {
		List<Account> list = new ArrayList<>();
		synchronized (this.accountList) {
			for (Account account : this.accountList) {
				if (!account.isOptionSet(Account.OPTION_DISABLED)) {
					list.add(account);
				}
			}
		}
		for (Account account : list) {
			disableAccount(account);
		}
	}

	private boolean accountsLeftToDisable() {
		synchronized (this.accountList) {
			for (Account account : this.accountList) {
				if (!account.isOptionSet(Account.OPTION_DISABLED)) {
					return true;
				}
			}
			return false;
		}
	}

	private boolean accountsLeftToEnable() {
		synchronized (this.accountList) {
			for (Account account : this.accountList) {
				if (account.isOptionSet(Account.OPTION_DISABLED)) {
					return true;
				}
			}
			return false;
		}
	}

	private void enableAllAccounts() {
		List<Account> list = new ArrayList<>();
		synchronized (this.accountList) {
			for (Account account : this.accountList) {
				if (account.isOptionSet(Account.OPTION_DISABLED)) {
					list.add(account);
				}
			}
		}
		for (Account account : list) {
			enableAccount(account);
		}
	}

	private void disableAccount(Account account) {
		account.setOption(Account.OPTION_DISABLED, true);
		xmppConnectionService.updateAccount(account);
	}

	private void enableAccount(Account account) {
		account.setOption(Account.OPTION_DISABLED, false);
		xmppConnectionService.updateAccount(account);
	}

	private void publishOpenPGPPublicKey(Account account) {
		if (ManageAccountActivity.this.hasPgp()) {
			choosePgpSignId(selectedAccount);
		} else {
			this.showInstallPgpDialog();
		}
	}

	private void deleteAccount(final Account account) {
		AlertDialog.Builder builder = new AlertDialog.Builder(
				ManageAccountActivity.this);
		builder.setTitle(getString(R.string.mgmt_account_are_you_sure));
		builder.setIconAttribute(android.R.attr.alertDialogIcon);
		builder.setMessage(getString(R.string.mgmt_account_delete_confirm_text));
		builder.setPositiveButton(getString(R.string.delete),
				new OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int which) {
						xmppConnectionService.deleteAccount(account);
						selectedAccount = null;
					}
				});
		builder.setNegativeButton(getString(R.string.cancel), null);
		builder.create().show();
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		if (resultCode == RESULT_OK) {
			if (xmppConnectionServiceBound) {
				if (requestCode == REQUEST_CHOOSE_PGP_ID) {
					if (data.getExtras().containsKey(OpenPgpApi.EXTRA_SIGN_KEY_ID)) {
						selectedAccount.setPgpSignId(data.getExtras().getLong(OpenPgpApi.EXTRA_SIGN_KEY_ID));
						announcePgp(selectedAccount, null);
					} else {
						choosePgpSignId(selectedAccount);
					}
				} else if (requestCode == REQUEST_ANNOUNCE_PGP) {
					announcePgp(selectedAccount, null);
				}
				this.mPostponedActivityResult = null;
			} else {
				this.mPostponedActivityResult = new Pair<>(requestCode, data);
			}
		}
	}

	@Override
	public void alias(String alias) {
		if (alias != null) {
			xmppConnectionService.createAccountFromKey(alias, this);
		}
	}

	@Override
	public void onAccountCreated(Account account) {
		switchToAccount(account, true);
	}

	@Override
	public void informUser(final int r) {
		runOnUiThread(new Runnable() {
			@Override
			public void run() {
				Toast.makeText(ManageAccountActivity.this, r, Toast.LENGTH_LONG).show();
			}
		});
	}
}