/*
 * 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
 */

package com.android.systemui.statusbar.phone;

import android.content.Context;
import android.os.Handler;
import android.os.PowerManager;
import android.os.SystemClock;
import android.util.Log;

import com.android.keyguard.KeyguardConstants;
import com.android.keyguard.KeyguardUpdateMonitor;
import com.android.keyguard.KeyguardUpdateMonitorCallback;
import com.android.systemui.keyguard.KeyguardViewMediator;

/**
 * Controller which coordinates all the fingerprint unlocking actions with the UI.
 */
public class FingerprintUnlockController extends KeyguardUpdateMonitorCallback {

    private static final String TAG = "FingerprintController";
    private static final boolean DEBUG_FP_WAKELOCK = KeyguardConstants.DEBUG_FP_WAKELOCK;
    private static final long FINGERPRINT_WAKELOCK_TIMEOUT_MS = 15 * 1000;
    private static final String FINGERPRINT_WAKE_LOCK_NAME = "wake-and-unlock wakelock";

    /**
     * Mode in which we don't need to wake up the device when we get a fingerprint.
     */
    public static final int MODE_NONE = 0;

    /**
     * Mode in which we wake up the device, and directly dismiss Keyguard. Active when we acquire
     * a fingerprint while the screen is off and the device was sleeping.
     */
    public static final int MODE_WAKE_AND_UNLOCK = 1;

    /**
     * Mode in which we wake the device up, and fade out the Keyguard contents because they were
     * already visible while pulsing in doze mode.
     */
    public static final int MODE_WAKE_AND_UNLOCK_PULSING = 2;

    /**
     * Mode in which we wake up the device, but play the normal dismiss animation. Active when we
     * acquire a fingerprint pulsing in doze mode.
     */
    public static final int MODE_SHOW_BOUNCER = 3;

    /**
     * Mode in which we only wake up the device, and keyguard was not showing when we acquired a
     * fingerprint.
     * */
    public static final int MODE_ONLY_WAKE = 4;

    /**
     * Mode in which fingerprint unlocks the device.
     */
    public static final int MODE_UNLOCK = 5;

    /**
     * Mode in which fingerprint brings up the bouncer because fingerprint unlocking is currently
     * not allowed.
     */
    public static final int MODE_DISMISS_BOUNCER = 6;

    /**
     * How much faster we collapse the lockscreen when authenticating with fingerprint.
     */
    private static final float FINGERPRINT_COLLAPSE_SPEEDUP_FACTOR = 1.3f;

    private PowerManager mPowerManager;
    private Handler mHandler = new Handler();
    private PowerManager.WakeLock mWakeLock;
    private KeyguardUpdateMonitor mUpdateMonitor;
    private int mMode;
    private StatusBarKeyguardViewManager mStatusBarKeyguardViewManager;
    private StatusBarWindowManager mStatusBarWindowManager;
    private DozeScrimController mDozeScrimController;
    private KeyguardViewMediator mKeyguardViewMediator;
    private ScrimController mScrimController;
    private PhoneStatusBar mPhoneStatusBar;
    private boolean mGoingToSleep;
    private int mPendingAuthenticatedUserId = -1;

    public FingerprintUnlockController(Context context,
            StatusBarWindowManager statusBarWindowManager,
            DozeScrimController dozeScrimController,
            KeyguardViewMediator keyguardViewMediator,
            ScrimController scrimController,
            PhoneStatusBar phoneStatusBar) {
        mPowerManager = context.getSystemService(PowerManager.class);
        mUpdateMonitor = KeyguardUpdateMonitor.getInstance(context);
        mUpdateMonitor.registerCallback(this);
        mStatusBarWindowManager = statusBarWindowManager;
        mDozeScrimController = dozeScrimController;
        mKeyguardViewMediator = keyguardViewMediator;
        mScrimController = scrimController;
        mPhoneStatusBar = phoneStatusBar;
    }

    public void setStatusBarKeyguardViewManager(
            StatusBarKeyguardViewManager statusBarKeyguardViewManager) {
        mStatusBarKeyguardViewManager = statusBarKeyguardViewManager;
    }

    private final Runnable mReleaseFingerprintWakeLockRunnable = new Runnable() {
        @Override
        public void run() {
            if (DEBUG_FP_WAKELOCK) {
                Log.i(TAG, "fp wakelock: TIMEOUT!!");
            }
            releaseFingerprintWakeLock();
        }
    };

    private void releaseFingerprintWakeLock() {
        if (mWakeLock != null) {
            mHandler.removeCallbacks(mReleaseFingerprintWakeLockRunnable);
            if (DEBUG_FP_WAKELOCK) {
                Log.i(TAG, "releasing fp wakelock");
            }
            mWakeLock.release();
            mWakeLock = null;
        }
    }

    @Override
    public void onFingerprintAcquired() {
        releaseFingerprintWakeLock();
        if (!mUpdateMonitor.isDeviceInteractive()) {
            mWakeLock = mPowerManager.newWakeLock(
                    PowerManager.PARTIAL_WAKE_LOCK, FINGERPRINT_WAKE_LOCK_NAME);
            mWakeLock.acquire();
            if (DEBUG_FP_WAKELOCK) {
                Log.i(TAG, "fingerprint acquired, grabbing fp wakelock");
            }
            mHandler.postDelayed(mReleaseFingerprintWakeLockRunnable,
                    FINGERPRINT_WAKELOCK_TIMEOUT_MS);
            if (mDozeScrimController.isPulsing()) {

                // If we are waking the device up while we are pulsing the clock and the
                // notifications would light up first, creating an unpleasant animation.
                // Defer changing the screen brightness by forcing doze brightness on our window
                // until the clock and the notifications are faded out.
                mStatusBarWindowManager.setForceDozeBrightness(true);
            }
        }
    }

    @Override
    public void onFingerprintAuthenticated(int userId) {
        if (mUpdateMonitor.isGoingToSleep()) {
            mPendingAuthenticatedUserId = userId;
            return;
        }
        boolean wasDeviceInteractive = mUpdateMonitor.isDeviceInteractive();
        mMode = calculateMode();
        if (!wasDeviceInteractive) {
            if (DEBUG_FP_WAKELOCK) {
                Log.i(TAG, "fp wakelock: Authenticated, waking up...");
            }
            mPowerManager.wakeUp(SystemClock.uptimeMillis(), "android.policy:FINGERPRINT");
        }
        releaseFingerprintWakeLock();
        switch (mMode) {
            case MODE_DISMISS_BOUNCER:
                mStatusBarKeyguardViewManager.notifyKeyguardAuthenticated(
                        false /* strongAuth */);
                break;
            case MODE_UNLOCK:
            case MODE_SHOW_BOUNCER:
                if (!wasDeviceInteractive) {
                    mStatusBarKeyguardViewManager.notifyDeviceWakeUpRequested();
                }
                mStatusBarKeyguardViewManager.animateCollapsePanels(
                        FINGERPRINT_COLLAPSE_SPEEDUP_FACTOR);
                break;
            case MODE_WAKE_AND_UNLOCK_PULSING:
                mPhoneStatusBar.updateMediaMetaData(false /* metaDataChanged */, 
                        true /* allowEnterAnimation */);
                // Fall through.
            case MODE_WAKE_AND_UNLOCK:
                mStatusBarWindowManager.setStatusBarFocusable(false);
                mDozeScrimController.abortPulsing();
                mKeyguardViewMediator.onWakeAndUnlocking();
                mScrimController.setWakeAndUnlocking();
                if (mPhoneStatusBar.getNavigationBarView() != null) {
                    mPhoneStatusBar.getNavigationBarView().setWakeAndUnlocking(true);
                }
                break;
            case MODE_ONLY_WAKE:
            case MODE_NONE:
                break;
        }
        if (mMode != MODE_WAKE_AND_UNLOCK_PULSING) {
            mStatusBarWindowManager.setForceDozeBrightness(false);
        }
        mPhoneStatusBar.notifyFpAuthModeChanged();
    }

    @Override
    public void onStartedGoingToSleep(int why) {
        mPendingAuthenticatedUserId = -1;
    }

    @Override
    public void onFinishedGoingToSleep(int why) {
        if (mPendingAuthenticatedUserId != -1) {

            // Post this to make sure it's executed after the device is fully locked.
            mHandler.post(new Runnable() {
                @Override
                public void run() {
                    onFingerprintAuthenticated(mPendingAuthenticatedUserId);
                }
            });
        }
        mPendingAuthenticatedUserId = -1;
    }

    public int getMode() {
        return mMode;
    }

    private int calculateMode() {
        boolean unlockingAllowed = mUpdateMonitor.isUnlockingWithFingerprintAllowed();
        if (!mUpdateMonitor.isDeviceInteractive()) {
            if (!mStatusBarKeyguardViewManager.isShowing()) {
                return MODE_ONLY_WAKE;
            } else if (mDozeScrimController.isPulsing() && unlockingAllowed) {
                return MODE_WAKE_AND_UNLOCK_PULSING;
            } else if (unlockingAllowed) {
                return MODE_WAKE_AND_UNLOCK;
            } else {
                return MODE_SHOW_BOUNCER;
            }
        }
        if (mStatusBarKeyguardViewManager.isShowing()) {
            if (mStatusBarKeyguardViewManager.isBouncerShowing() && unlockingAllowed) {
                return MODE_DISMISS_BOUNCER;
            } else if (unlockingAllowed) {
                return MODE_UNLOCK;
            } else if (!mStatusBarKeyguardViewManager.isBouncerShowing()) {
                return MODE_SHOW_BOUNCER;
            }
        }
        return MODE_NONE;
    }

    @Override
    public void onFingerprintAuthFailed() {
        cleanup();
    }

    @Override
    public void onFingerprintError(int msgId, String errString) {
        cleanup();
    }

    private void cleanup() {
        mMode = MODE_NONE;
        releaseFingerprintWakeLock();
        mStatusBarWindowManager.setForceDozeBrightness(false);
        mPhoneStatusBar.notifyFpAuthModeChanged();
    }

    public void startKeyguardFadingAway() {

        // Disable brightness override when the ambient contents are fully invisible.
        mHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                mStatusBarWindowManager.setForceDozeBrightness(false);
            }
        }, PhoneStatusBar.FADE_KEYGUARD_DURATION_PULSING);
    }

    public void finishKeyguardFadingAway() {
        mMode = MODE_NONE;
        if (mPhoneStatusBar.getNavigationBarView() != null) {
            mPhoneStatusBar.getNavigationBarView().setWakeAndUnlocking(false);
        }
        mPhoneStatusBar.notifyFpAuthModeChanged();
    }
}