/*
 * Copyright (C) 2012 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.
 */
package com.android.keyguard;

import static com.android.internal.util.LatencyTracker.ACTION_CHECK_CREDENTIAL;
import static com.android.internal.util.LatencyTracker.ACTION_CHECK_CREDENTIAL_UNLOCKED;

import android.content.Context;
import android.graphics.Rect;
import android.os.AsyncTask;
import android.os.CountDownTimer;
import android.os.SystemClock;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;
import android.view.animation.Interpolator;
import android.widget.LinearLayout;

import com.android.internal.util.LatencyTracker;
import com.android.internal.widget.LockPatternChecker;
import com.android.internal.widget.LockPatternUtils;
import com.android.internal.widget.LockPatternView;
import com.android.settingslib.animation.AppearAnimationCreator;
import com.android.settingslib.animation.AppearAnimationUtils;
import com.android.settingslib.animation.DisappearAnimationUtils;

import java.util.List;

public class KeyguardPatternView extends LinearLayout implements KeyguardSecurityView,
        AppearAnimationCreator<LockPatternView.CellState>,
        EmergencyButton.EmergencyButtonCallback {

    private static final String TAG = "SecurityPatternView";
    private static final boolean DEBUG = KeyguardConstants.DEBUG;

    // how long before we clear the wrong pattern
    private static final int PATTERN_CLEAR_TIMEOUT_MS = 2000;

    // how long we stay awake after each key beyond MIN_PATTERN_BEFORE_POKE_WAKELOCK
    private static final int UNLOCK_PATTERN_WAKE_INTERVAL_MS = 7000;

    // how many cells the user has to cross before we poke the wakelock
    private static final int MIN_PATTERN_BEFORE_POKE_WAKELOCK = 2;

    // How much we scale up the duration of the disappear animation when the current user is locked
    public static final float DISAPPEAR_MULTIPLIER_LOCKED = 1.5f;

    private final KeyguardUpdateMonitor mKeyguardUpdateMonitor;
    private final AppearAnimationUtils mAppearAnimationUtils;
    private final DisappearAnimationUtils mDisappearAnimationUtils;
    private final DisappearAnimationUtils mDisappearAnimationUtilsLocked;

    private CountDownTimer mCountdownTimer = null;
    private LockPatternUtils mLockPatternUtils;
    private AsyncTask<?, ?, ?> mPendingLockCheck;
    private LockPatternView mLockPatternView;
    private KeyguardSecurityCallback mCallback;

    
Keeps track of the last time we poked the wake lock during dispatching of the touch event.
Initialized to something guaranteed to make us poke the wakelock when the user starts
drawing the pattern.
See Also:
dispatchTouchEvent(MotionEvent)/**
     * Keeps track of the last time we poked the wake lock during dispatching of the touch event.
     * Initialized to something guaranteed to make us poke the wakelock when the user starts
     * drawing the pattern.
     * @see #dispatchTouchEvent(android.view.MotionEvent)
     */
    private long mLastPokeTime = -UNLOCK_PATTERN_WAKE_INTERVAL_MS;

    
Useful for clearing out the wrong pattern after a delay
/**
     * Useful for clearing out the wrong pattern after a delay
     */
    private Runnable mCancelPatternRunnable = new Runnable() {
        @Override
        public void run() {
            mLockPatternView.clearPattern();
        }
    };
    private Rect mTempRect = new Rect();
    private KeyguardMessageArea mSecurityMessageDisplay;
    private View mEcaView;
    private ViewGroup mContainer;
    private int mDisappearYTranslation;

    enum FooterMode {
        Normal,
        ForgotLockPattern,
        VerifyUnlocked
    }

    public KeyguardPatternView(Context context) {
        this(context, null);
    }

    public KeyguardPatternView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mKeyguardUpdateMonitor = KeyguardUpdateMonitor.getInstance(mContext);
        mAppearAnimationUtils = new AppearAnimationUtils(context,
                AppearAnimationUtils.DEFAULT_APPEAR_DURATION, 1.5f /* translationScale */,
                2.0f /* delayScale */, AnimationUtils.loadInterpolator(
                        mContext, android.R.interpolator.linear_out_slow_in));
        mDisappearAnimationUtils = new DisappearAnimationUtils(context,
                125, 1.2f /* translationScale */,
                0.6f /* delayScale */, AnimationUtils.loadInterpolator(
                        mContext, android.R.interpolator.fast_out_linear_in));
        mDisappearAnimationUtilsLocked = new DisappearAnimationUtils(context,
                (long) (125 * DISAPPEAR_MULTIPLIER_LOCKED), 1.2f /* translationScale */,
                0.6f /* delayScale */, AnimationUtils.loadInterpolator(
                mContext, android.R.interpolator.fast_out_linear_in));
        mDisappearYTranslation = getResources().getDimensionPixelSize(
                R.dimen.disappear_y_translation);
    }

    @Override
    public void setKeyguardCallback(KeyguardSecurityCallback callback) {
        mCallback = callback;
    }

    @Override
    public void setLockPatternUtils(LockPatternUtils utils) {
        mLockPatternUtils = utils;
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        mLockPatternUtils = mLockPatternUtils == null
                ? new LockPatternUtils(mContext) : mLockPatternUtils;

        mLockPatternView = findViewById(R.id.lockPatternView);
        mLockPatternView.setSaveEnabled(false);
        mLockPatternView.setOnPatternListener(new UnlockPatternListener());
        mLockPatternView.setInStealthMode(!mLockPatternUtils.isVisiblePatternEnabled(
                KeyguardUpdateMonitor.getCurrentUser()));

        // vibrate mode will be the same for the life of this screen
        mLockPatternView.setTactileFeedbackEnabled(mLockPatternUtils.isTactileFeedbackEnabled());

        mSecurityMessageDisplay =
                (KeyguardMessageArea) KeyguardMessageArea.findSecurityMessageDisplay(this);
        mEcaView = findViewById(R.id.keyguard_selector_fade_container);
        mContainer = findViewById(R.id.container);

        EmergencyButton button = findViewById(R.id.emergency_call_button);
        if (button != null) {
            button.setCallback(this);
        }

        View cancelBtn = findViewById(R.id.cancel_button);
        if (cancelBtn != null) {
            cancelBtn.setOnClickListener(view -> {
                mCallback.reset();
            });
        }
    }

    @Override
    public void onEmergencyButtonClickedWhenInCall() {
        mCallback.reset();
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        boolean result = super.onTouchEvent(ev);
        // as long as the user is entering a pattern (i.e sending a touch event that was handled
        // by this screen), keep poking the wake lock so that the screen will stay on.
        final long elapsed = SystemClock.elapsedRealtime() - mLastPokeTime;
        if (result && (elapsed > (UNLOCK_PATTERN_WAKE_INTERVAL_MS - 100))) {
            mLastPokeTime = SystemClock.elapsedRealtime();
        }
        mTempRect.set(0, 0, 0, 0);
        offsetRectIntoDescendantCoords(mLockPatternView, mTempRect);
        ev.offsetLocation(mTempRect.left, mTempRect.top);
        result = mLockPatternView.dispatchTouchEvent(ev) || result;
        ev.offsetLocation(-mTempRect.left, -mTempRect.top);
        return result;
    }

    @Override
    public void reset() {
        // reset lock pattern
        mLockPatternView.setInStealthMode(!mLockPatternUtils.isVisiblePatternEnabled(
                KeyguardUpdateMonitor.getCurrentUser()));
        mLockPatternView.enableInput();
        mLockPatternView.setEnabled(true);
        mLockPatternView.clearPattern();

        // if the user is currently locked out, enforce it.
        long deadline = mLockPatternUtils.getLockoutAttemptDeadline(
                KeyguardUpdateMonitor.getCurrentUser());
        if (deadline != 0) {
            handleAttemptLockout(deadline);
        } else {
            displayDefaultSecurityMessage();
        }
    }

    private void displayDefaultSecurityMessage() {
        mSecurityMessageDisplay.setMessage("");
    }

    @Override
    public void showUsabilityHint() {
    }

    
TODO: hook this up /** TODO: hook this up */
    public void cleanUp() {
        if (DEBUG) Log.v(TAG, "Cleanup() called on " + this);
        mLockPatternUtils = null;
        mLockPatternView.setOnPatternListener(null);
    }

    private class UnlockPatternListener implements LockPatternView.OnPatternListener {

        @Override
        public void onPatternStart() {
            mLockPatternView.removeCallbacks(mCancelPatternRunnable);
            mSecurityMessageDisplay.setMessage("");
        }

        @Override
        public void onPatternCleared() {
        }

        @Override
        public void onPatternCellAdded(List<LockPatternView.Cell> pattern) {
            mCallback.userActivity();
        }

        @Override
        public void onPatternDetected(final List<LockPatternView.Cell> pattern) {
            mLockPatternView.disableInput();
            if (mPendingLockCheck != null) {
                mPendingLockCheck.cancel(false);
            }

            final int userId = KeyguardUpdateMonitor.getCurrentUser();
            if (pattern.size() < LockPatternUtils.MIN_PATTERN_REGISTER_FAIL) {
                mLockPatternView.enableInput();
                onPatternChecked(userId, false, 0, false /* not valid - too short */);
                return;
            }

            if (LatencyTracker.isEnabled(mContext)) {
                LatencyTracker.getInstance(mContext).onActionStart(ACTION_CHECK_CREDENTIAL);
                LatencyTracker.getInstance(mContext).onActionStart(ACTION_CHECK_CREDENTIAL_UNLOCKED);
            }
            mPendingLockCheck = LockPatternChecker.checkPattern(
                    mLockPatternUtils,
                    pattern,
                    userId,
                    new LockPatternChecker.OnCheckCallback() {

                        @Override
                        public void onEarlyMatched() {
                            if (LatencyTracker.isEnabled(mContext)) {
                                LatencyTracker.getInstance(mContext).onActionEnd(
                                        ACTION_CHECK_CREDENTIAL);
                            }
                            onPatternChecked(userId, true /* matched */, 0 /* timeoutMs */,
                                    true /* isValidPattern */);
                        }

                        @Override
                        public void onChecked(boolean matched, int timeoutMs) {
                            if (LatencyTracker.isEnabled(mContext)) {
                                LatencyTracker.getInstance(mContext).onActionEnd(
                                        ACTION_CHECK_CREDENTIAL_UNLOCKED);
                            }
                            mLockPatternView.enableInput();
                            mPendingLockCheck = null;
                            if (!matched) {
                                onPatternChecked(userId, false /* matched */, timeoutMs,
                                        true /* isValidPattern */);
                            }
                        }

                        @Override
                        public void onCancelled() {
                            // We already got dismissed with the early matched callback, so we
                            // cancelled the check. However, we still need to note down the latency.
                            if (LatencyTracker.isEnabled(mContext)) {
                                LatencyTracker.getInstance(mContext).onActionEnd(
                                        ACTION_CHECK_CREDENTIAL_UNLOCKED);
                            }
                        }
                    });
            if (pattern.size() > MIN_PATTERN_BEFORE_POKE_WAKELOCK) {
                mCallback.userActivity();
            }
        }

        private void onPatternChecked(int userId, boolean matched, int timeoutMs,
                boolean isValidPattern) {
            boolean dismissKeyguard = KeyguardUpdateMonitor.getCurrentUser() == userId;
            if (matched) {
                mCallback.reportUnlockAttempt(userId, true, 0);
                if (dismissKeyguard) {
                    mLockPatternView.setDisplayMode(LockPatternView.DisplayMode.Correct);
                    mCallback.dismiss(true, userId);
                }
            } else {
                mLockPatternView.setDisplayMode(LockPatternView.DisplayMode.Wrong);
                if (isValidPattern) {
                    mCallback.reportUnlockAttempt(userId, false, timeoutMs);
                    if (timeoutMs > 0) {
                        long deadline = mLockPatternUtils.setLockoutAttemptDeadline(
                                userId, timeoutMs);
                        handleAttemptLockout(deadline);
                    }
                }
                if (timeoutMs == 0) {
                    mSecurityMessageDisplay.setMessage(R.string.kg_wrong_pattern);
                    mLockPatternView.postDelayed(mCancelPatternRunnable, PATTERN_CLEAR_TIMEOUT_MS);
                }
            }
        }
    }

    private void handleAttemptLockout(long elapsedRealtimeDeadline) {
        mLockPatternView.clearPattern();
        mLockPatternView.setEnabled(false);
        final long elapsedRealtime = SystemClock.elapsedRealtime();
        final long secondsInFuture = (long) Math.ceil(
                (elapsedRealtimeDeadline - elapsedRealtime) / 1000.0);
        mCountdownTimer = new CountDownTimer(secondsInFuture * 1000, 1000) {

            @Override
            public void onTick(long millisUntilFinished) {
                final int secondsRemaining = (int) Math.round(millisUntilFinished / 1000.0);
                mSecurityMessageDisplay.setMessage(mContext.getResources().getQuantityString(
                                R.plurals.kg_too_many_failed_attempts_countdown,
                                secondsRemaining, secondsRemaining));
            }

            @Override
            public void onFinish() {
                mLockPatternView.setEnabled(true);
                displayDefaultSecurityMessage();
            }

        }.start();
    }

    @Override
    public boolean needsInput() {
        return false;
    }

    @Override
    public void onPause() {
        if (mCountdownTimer != null) {
            mCountdownTimer.cancel();
            mCountdownTimer = null;
        }
        if (mPendingLockCheck != null) {
            mPendingLockCheck.cancel(false);
            mPendingLockCheck = null;
        }
    }

    @Override
    public void onResume(int reason) {
    }

    @Override
    public KeyguardSecurityCallback getCallback() {
        return mCallback;
    }

    @Override
    public void showPromptReason(int reason) {
        switch (reason) {
            case PROMPT_REASON_RESTART:
                mSecurityMessageDisplay.setMessage(R.string.kg_prompt_reason_restart_pattern);
                break;
            case PROMPT_REASON_TIMEOUT:
                mSecurityMessageDisplay.setMessage(R.string.kg_prompt_reason_timeout_pattern);
                break;
            case PROMPT_REASON_DEVICE_ADMIN:
                mSecurityMessageDisplay.setMessage(R.string.kg_prompt_reason_device_admin);
                break;
            case PROMPT_REASON_USER_REQUEST:
                mSecurityMessageDisplay.setMessage(R.string.kg_prompt_reason_user_request);
                break;
            case PROMPT_REASON_NONE:
                break;
            default:
                mSecurityMessageDisplay.setMessage(R.string.kg_prompt_reason_timeout_pattern);
                break;
        }
    }

    @Override
    public void showMessage(CharSequence message, int color) {
        mSecurityMessageDisplay.setNextMessageColor(color);
        mSecurityMessageDisplay.setMessage(message);
    }

    @Override
    public void startAppearAnimation() {
        enableClipping(false);
        setAlpha(1f);
        setTranslationY(mAppearAnimationUtils.getStartTranslation());
        AppearAnimationUtils.startTranslationYAnimation(this, 0 /* delay */, 500 /* duration */,
                0, mAppearAnimationUtils.getInterpolator());
        mAppearAnimationUtils.startAnimation2d(
                mLockPatternView.getCellStates(),
                new Runnable() {
                    @Override
                    public void run() {
                        enableClipping(true);
                    }
                },
                this);
        if (!TextUtils.isEmpty(mSecurityMessageDisplay.getText())) {
            mAppearAnimationUtils.createAnimation(mSecurityMessageDisplay, 0,
                    AppearAnimationUtils.DEFAULT_APPEAR_DURATION,
                    mAppearAnimationUtils.getStartTranslation(),
                    true /* appearing */,
                    mAppearAnimationUtils.getInterpolator(),
                    null /* finishRunnable */);
        }
    }

    @Override
    public boolean startDisappearAnimation(final Runnable finishRunnable) {
        float durationMultiplier = mKeyguardUpdateMonitor.needsSlowUnlockTransition()
                ? DISAPPEAR_MULTIPLIER_LOCKED
                : 1f;
        mLockPatternView.clearPattern();
        enableClipping(false);
        setTranslationY(0);
        AppearAnimationUtils.startTranslationYAnimation(this, 0 /* delay */,
                (long) (300 * durationMultiplier),
                -mDisappearAnimationUtils.getStartTranslation(),
                mDisappearAnimationUtils.getInterpolator());

        DisappearAnimationUtils disappearAnimationUtils = mKeyguardUpdateMonitor
                .needsSlowUnlockTransition()
                        ? mDisappearAnimationUtilsLocked
                        : mDisappearAnimationUtils;
        disappearAnimationUtils.startAnimation2d(mLockPatternView.getCellStates(),
                () -> {
                    enableClipping(true);
                    if (finishRunnable != null) {
                        finishRunnable.run();
                    }
                }, KeyguardPatternView.this);
        if (!TextUtils.isEmpty(mSecurityMessageDisplay.getText())) {
            mDisappearAnimationUtils.createAnimation(mSecurityMessageDisplay, 0,
                    (long) (200 * durationMultiplier),
                    - mDisappearAnimationUtils.getStartTranslation() * 3,
                    false /* appearing */,
                    mDisappearAnimationUtils.getInterpolator(),
                    null /* finishRunnable */);
        }
        return true;
    }

    private void enableClipping(boolean enable) {
        setClipChildren(enable);
        mContainer.setClipToPadding(enable);
        mContainer.setClipChildren(enable);
    }

    @Override
    public void createAnimation(final LockPatternView.CellState animatedCell, long delay,
            long duration, float translationY, final boolean appearing,
            Interpolator interpolator,
            final Runnable finishListener) {
        mLockPatternView.startCellStateAnimation(animatedCell,
                1f, appearing ? 1f : 0f, /* alpha */
                appearing ? translationY : 0f, appearing ? 0f : translationY, /* translation */
                appearing ? 0f : 1f, 1f /* scale */,
                delay, duration, interpolator, finishListener);
        if (finishListener != null) {
            // Also animate the Emergency call
            mAppearAnimationUtils.createAnimation(mEcaView, delay, duration, translationY,
                    appearing, interpolator, null);
        }
    }

    @Override
    public boolean hasOverlappingRendering() {
        return false;
    }

    @Override
    public CharSequence getTitle() {
        return getContext().getString(
                com.android.internal.R.string.keyguard_accessibility_pattern_unlock);
    }
}