/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * 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
 */

// TODO (b/35202196): move this class out of the root of the package.
package com.android.settings.password;

import android.annotation.Nullable;
import android.app.ActivityManager;
import android.app.ActivityOptions;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.app.FragmentManager;
import android.app.IActivityManager;
import android.app.KeyguardManager;
import android.app.admin.DevicePolicyManager;
import android.app.trust.TrustManager;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentSender;
import android.content.pm.UserInfo;
import android.graphics.Point;
import android.graphics.PorterDuff;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Handler;
import android.os.RemoteException;
import android.os.UserManager;
import android.text.TextUtils;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.TextView;

import com.android.internal.widget.LockPatternUtils;
import com.android.settings.R;
import com.android.settings.Utils;
import com.android.settings.core.InstrumentedFragment;
import com.android.settings.fingerprint.FingerprintUiHelper;

/**
 * Base fragment to be shared for PIN/Pattern/Password confirmation fragments.
 */
public abstract class ConfirmDeviceCredentialBaseFragment extends InstrumentedFragment
        implements FingerprintUiHelper.Callback {

    public static final String PACKAGE = "com.android.settings";
    public static final String TITLE_TEXT = PACKAGE + ".ConfirmCredentials.title";
    public static final String HEADER_TEXT = PACKAGE + ".ConfirmCredentials.header";
    public static final String DETAILS_TEXT = PACKAGE + ".ConfirmCredentials.details";
    public static final String ALLOW_FP_AUTHENTICATION =
            PACKAGE + ".ConfirmCredentials.allowFpAuthentication";
    public static final String DARK_THEME = PACKAGE + ".ConfirmCredentials.darkTheme";
    public static final String SHOW_CANCEL_BUTTON =
            PACKAGE + ".ConfirmCredentials.showCancelButton";
    public static final String SHOW_WHEN_LOCKED =
            PACKAGE + ".ConfirmCredentials.showWhenLocked";

    protected static final int USER_TYPE_PRIMARY = 1;
    protected static final int USER_TYPE_MANAGED_PROFILE = 2;
    protected static final int USER_TYPE_SECONDARY = 3;

    /** Time we wait before clearing a wrong input attempt (e.g. pattern) and the error message. */
    protected static final long CLEAR_WRONG_ATTEMPT_TIMEOUT_MS = 3000;

    private FingerprintUiHelper mFingerprintHelper;
    protected boolean mReturnCredentials = false;
    protected Button mCancelButton;
    protected ImageView mFingerprintIcon;
    protected int mEffectiveUserId;
    protected int mUserId;
    protected UserManager mUserManager;
    protected LockPatternUtils mLockPatternUtils;
    protected DevicePolicyManager mDevicePolicyManager;
    protected TextView mErrorTextView;
    protected final Handler mHandler = new Handler();
    protected boolean mFrp;
    private CharSequence mFrpAlternateButtonText;

    private boolean isInternalActivity() {
        return (getActivity() instanceof ConfirmLockPassword.InternalActivity)
                || (getActivity() instanceof ConfirmLockPattern.InternalActivity);
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mFrpAlternateButtonText = getActivity().getIntent().getCharSequenceExtra(
                KeyguardManager.EXTRA_ALTERNATE_BUTTON_LABEL);
        mReturnCredentials = getActivity().getIntent().getBooleanExtra(
                ChooseLockSettingsHelper.EXTRA_KEY_RETURN_CREDENTIALS, false);
        // Only take this argument into account if it belongs to the current profile.
        Intent intent = getActivity().getIntent();
        mUserId = Utils.getUserIdFromBundle(getActivity(), intent.getExtras(),
                isInternalActivity());
        mFrp = (mUserId == LockPatternUtils.USER_FRP);
        mUserManager = UserManager.get(getActivity());
        mEffectiveUserId = mUserManager.getCredentialOwnerProfile(mUserId);
        mLockPatternUtils = new LockPatternUtils(getActivity());
        mDevicePolicyManager = (DevicePolicyManager) getActivity().getSystemService(
                Context.DEVICE_POLICY_SERVICE);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        mCancelButton = (Button) view.findViewById(R.id.cancelButton);
        mFingerprintIcon = (ImageView) view.findViewById(R.id.fingerprintIcon);
        mFingerprintHelper = new FingerprintUiHelper(
                mFingerprintIcon,
                (TextView) view.findViewById(R.id.errorText), this, mEffectiveUserId);
        boolean showCancelButton = getActivity().getIntent().getBooleanExtra(
                SHOW_CANCEL_BUTTON, false);
        boolean hasAlternateButton = mFrp && !TextUtils.isEmpty(mFrpAlternateButtonText);
        mCancelButton.setVisibility(showCancelButton || hasAlternateButton
                ? View.VISIBLE : View.GONE);
        if (hasAlternateButton) {
            mCancelButton.setText(mFrpAlternateButtonText);
        }
        mCancelButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (hasAlternateButton) {
                    getActivity().setResult(KeyguardManager.RESULT_ALTERNATE);
                }
                getActivity().finish();
            }
        });
        int credentialOwnerUserId = Utils.getCredentialOwnerUserId(
                getActivity(),
                Utils.getUserIdFromBundle(
                        getActivity(),
                        getActivity().getIntent().getExtras(), isInternalActivity()));
        if (mUserManager.isManagedProfile(credentialOwnerUserId)) {
            setWorkChallengeBackground(view, credentialOwnerUserId);
        }
    }

    private boolean isFingerprintDisabledByAdmin() {
        final int disabledFeatures =
                mDevicePolicyManager.getKeyguardDisabledFeatures(null, mEffectiveUserId);
        return (disabledFeatures & DevicePolicyManager.KEYGUARD_DISABLE_FINGERPRINT) != 0;
    }

    // User could be locked while Effective user is unlocked even though the effective owns the
    // credential. Otherwise, fingerprint can't unlock fbe/keystore through
    // verifyTiedProfileChallenge. In such case, we also wanna show the user message that
    // fingerprint is disabled due to device restart.
    protected boolean isStrongAuthRequired() {
        return mFrp
                || !mLockPatternUtils.isFingerprintAllowedForUser(mEffectiveUserId)
                || !mUserManager.isUserUnlocked(mUserId);
    }

    private boolean isFingerprintAllowed() {
        return !mReturnCredentials
                && getActivity().getIntent().getBooleanExtra(ALLOW_FP_AUTHENTICATION, false)
                && !isStrongAuthRequired()
                && !isFingerprintDisabledByAdmin();
    }

    @Override
    public void onResume() {
        super.onResume();
        refreshLockScreen();
    }

    protected void refreshLockScreen() {
        if (isFingerprintAllowed()) {
            mFingerprintHelper.startListening();
        } else {
            if (mFingerprintHelper.isListening()) {
                mFingerprintHelper.stopListening();
            }
        }
        updateErrorMessage(mLockPatternUtils.getCurrentFailedPasswordAttempts(mEffectiveUserId));
    }

    protected void setAccessibilityTitle(CharSequence supplementalText) {
        Intent intent = getActivity().getIntent();
        if (intent != null) {
            CharSequence titleText = intent.getCharSequenceExtra(
                    ConfirmDeviceCredentialBaseFragment.TITLE_TEXT);
            if (supplementalText == null) {
                return;
            }
            if (titleText == null) {
                getActivity().setTitle(supplementalText);
            } else {
                String accessibilityTitle =
                        new StringBuilder(titleText).append(",").append(supplementalText).toString();
                getActivity().setTitle(Utils.createAccessibleSequence(titleText, accessibilityTitle));
            }
        }
    }

    @Override
    public void onPause() {
        super.onPause();
        if (mFingerprintHelper.isListening()) {
            mFingerprintHelper.stopListening();
        }
    }

    @Override
    public void onAuthenticated() {
        // Check whether we are still active.
        if (getActivity() != null && getActivity().isResumed()) {
            TrustManager trustManager =
                (TrustManager) getActivity().getSystemService(Context.TRUST_SERVICE);
            trustManager.setDeviceLockedForUser(mEffectiveUserId, false);
            authenticationSucceeded();
            checkForPendingIntent();
        }
    }

    protected abstract void authenticationSucceeded();

    @Override
    public void onFingerprintIconVisibilityChanged(boolean visible) {
    }

    public void prepareEnterAnimation() {
    }

    public void startEnterAnimation() {
    }

    protected void checkForPendingIntent() {
        int taskId = getActivity().getIntent().getIntExtra(Intent.EXTRA_TASK_ID, -1);
        if (taskId != -1) {
            try {
                IActivityManager activityManager = ActivityManager.getService();
                final ActivityOptions options = ActivityOptions.makeBasic();
                activityManager.startActivityFromRecents(taskId, options.toBundle());
                return;
            } catch (RemoteException e) {
                // Do nothing.
            }
        }
        IntentSender intentSender = getActivity().getIntent()
                .getParcelableExtra(Intent.EXTRA_INTENT);
        if (intentSender != null) {
            try {
                getActivity().startIntentSenderForResult(intentSender, -1, null, 0, 0, 0);
            } catch (IntentSender.SendIntentException e) {
                /* ignore */
            }
        }
    }

    private void setWorkChallengeBackground(View baseView, int userId) {
        View mainContent = getActivity().findViewById(com.android.settings.R.id.main_content);
        if (mainContent != null) {
            // Remove the main content padding so that the background image is full screen.
            mainContent.setPadding(0, 0, 0, 0);
        }

        baseView.setBackground(
                new ColorDrawable(mDevicePolicyManager.getOrganizationColorForUser(userId)));
        ImageView imageView = (ImageView) baseView.findViewById(R.id.background_image);
        if (imageView != null) {
            Drawable image = getResources().getDrawable(R.drawable.work_challenge_background);
            image.setColorFilter(
                    getResources().getColor(R.color.confirm_device_credential_transparent_black),
                    PorterDuff.Mode.DARKEN);
            imageView.setImageDrawable(image);
            Point screenSize = new Point();
            getActivity().getWindowManager().getDefaultDisplay().getSize(screenSize);
            imageView.setLayoutParams(new FrameLayout.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT,
                    screenSize.y));
        }
    }

    protected void reportSuccessfulAttempt() {
        mLockPatternUtils.reportSuccessfulPasswordAttempt(mEffectiveUserId);
        if (mUserManager.isManagedProfile(mEffectiveUserId)) {
            // Keyguard is responsible to disable StrongAuth for primary user. Disable StrongAuth
            // for work challenge only here.
            mLockPatternUtils.userPresent(mEffectiveUserId);
        }
    }

    protected void reportFailedAttempt() {
        updateErrorMessage(
                mLockPatternUtils.getCurrentFailedPasswordAttempts(mEffectiveUserId) + 1);
        mLockPatternUtils.reportFailedPasswordAttempt(mEffectiveUserId);
    }

    protected void updateErrorMessage(int numAttempts) {
        final int maxAttempts =
                mLockPatternUtils.getMaximumFailedPasswordsForWipe(mEffectiveUserId);
        if (maxAttempts <= 0 || numAttempts <= 0) {
            return;
        }

        // Update the on-screen error string
        if (mErrorTextView != null) {
            final String message = getActivity().getString(
                    R.string.lock_failed_attempts_before_wipe, numAttempts, maxAttempts);
            showError(message, 0);
        }

        // Only show popup dialog before the last attempt and before wipe
        final int remainingAttempts = maxAttempts - numAttempts;
        if (remainingAttempts > 1) {
            return;
        }
        final FragmentManager fragmentManager = getChildFragmentManager();
        final int userType = getUserTypeForWipe();
        if (remainingAttempts == 1) {
            // Last try
            final String title = getActivity().getString(
                    R.string.lock_last_attempt_before_wipe_warning_title);
            final int messageId = getLastTryErrorMessage(userType);
            LastTryDialog.show(fragmentManager, title, messageId,
                    android.R.string.ok, false /* dismiss */);
        } else {
            // Device, profile, or secondary user is wiped
            final int messageId = getWipeMessage(userType);
            LastTryDialog.show(fragmentManager, null /* title */, messageId,
                    R.string.lock_failed_attempts_now_wiping_dialog_dismiss, true /* dismiss */);
        }
    }

    private int getUserTypeForWipe() {
        final UserInfo userToBeWiped = mUserManager.getUserInfo(
                mDevicePolicyManager.getProfileWithMinimumFailedPasswordsForWipe(mEffectiveUserId));
        if (userToBeWiped == null || userToBeWiped.isPrimary()) {
            return USER_TYPE_PRIMARY;
        } else if (userToBeWiped.isManagedProfile()) {
            return USER_TYPE_MANAGED_PROFILE;
        } else {
            return USER_TYPE_SECONDARY;
        }
    }

    protected abstract int getLastTryErrorMessage(int userType);

    private int getWipeMessage(int userType) {
        switch (userType) {
            case USER_TYPE_PRIMARY:
                return R.string.lock_failed_attempts_now_wiping_device;
            case USER_TYPE_MANAGED_PROFILE:
                return R.string.lock_failed_attempts_now_wiping_profile;
            case USER_TYPE_SECONDARY:
                return R.string.lock_failed_attempts_now_wiping_user;
            default:
                throw new IllegalArgumentException("Unrecognized user type:" + userType);
        }
    }

    private final Runnable mResetErrorRunnable = new Runnable() {
        @Override
        public void run() {
            mErrorTextView.setText("");
        }
    };

    protected void showError(CharSequence msg, long timeout) {
        mErrorTextView.setText(msg);
        onShowError();
        mHandler.removeCallbacks(mResetErrorRunnable);
        if (timeout != 0) {
            mHandler.postDelayed(mResetErrorRunnable, timeout);
        }
    }

    protected abstract void onShowError();

    protected void showError(int msg, long timeout) {
        showError(getText(msg), timeout);
    }

    public static class LastTryDialog extends DialogFragment {
        private static final String TAG = LastTryDialog.class.getSimpleName();

        private static final String ARG_TITLE = "title";
        private static final String ARG_MESSAGE = "message";
        private static final String ARG_BUTTON = "button";
        private static final String ARG_DISMISS = "dismiss";

        static boolean show(FragmentManager from, String title, int message, int button,
                boolean dismiss) {
            LastTryDialog existent = (LastTryDialog) from.findFragmentByTag(TAG);
            if (existent != null && !existent.isRemoving()) {
                return false;
            }
            Bundle args = new Bundle();
            args.putString(ARG_TITLE, title);
            args.putInt(ARG_MESSAGE, message);
            args.putInt(ARG_BUTTON, button);
            args.putBoolean(ARG_DISMISS, dismiss);

            DialogFragment dialog = new LastTryDialog();
            dialog.setArguments(args);
            dialog.show(from, TAG);
            from.executePendingTransactions();
            return true;
        }

        static void hide(FragmentManager from) {
            LastTryDialog dialog = (LastTryDialog) from.findFragmentByTag(TAG);
            if (dialog != null) {
                dialog.dismissAllowingStateLoss();
                from.executePendingTransactions();
            }
        }

        /**
         * Dialog setup.
         * <p>
         * To make it less likely that the dialog is dismissed accidentally, for example if the
         * device is malfunctioning or if the device is in a pocket, we set
         * {@code setCanceledOnTouchOutside(false)}.
         */
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            Dialog dialog = new AlertDialog.Builder(getActivity())
                    .setTitle(getArguments().getString(ARG_TITLE))
                    .setMessage(getArguments().getInt(ARG_MESSAGE))
                    .setPositiveButton(getArguments().getInt(ARG_BUTTON), null)
                    .create();
            dialog.setCanceledOnTouchOutside(false);
            return dialog;
        }

        @Override
        public void onDismiss(final DialogInterface dialog) {
            super.onDismiss(dialog);
            if (getActivity() != null && getArguments().getBoolean(ARG_DISMISS)) {
                getActivity().finish();
            }
        }
    }
}