/*
 * 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.tv;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.media.tv.TvContract.Programs;
import android.media.tv.TvInputInfo;
import android.media.tv.TvInputManager;
import android.media.tv.TvInputManager.TvInputCallback;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.text.TextUtils;
import android.util.Log;
import android.view.KeyEvent;
import android.widget.Toast;

import com.android.tv.common.BaseApplication;
import com.android.tv.common.feature.CommonFeatures;
import com.android.tv.common.recording.RecordingStorageStatusManager;
import com.android.tv.common.ui.setup.animation.SetupAnimationHelper;
import com.android.tv.common.util.Debug;
import com.android.tv.common.util.SharedPreferencesUtils;
import com.android.tv.data.ChannelDataManager;
import com.android.tv.data.PreviewDataManager;
import com.android.tv.data.ProgramDataManager;
import com.android.tv.data.epg.EpgFetcher;
import com.android.tv.data.epg.EpgReader;
import com.android.tv.dvr.DvrDataManager;
import com.android.tv.dvr.DvrManager;
import com.android.tv.dvr.DvrScheduleManager;
import com.android.tv.dvr.DvrStorageStatusManager;
import com.android.tv.dvr.DvrWatchedPositionManager;
import com.android.tv.dvr.recorder.RecordingScheduler;
import com.android.tv.dvr.ui.browse.DvrBrowseActivity;
import com.android.tv.features.TvFeatures;
import com.android.tv.perf.PerformanceMonitor;
import com.android.tv.perf.StartupMeasure;
import com.android.tv.perf.StartupMeasureFactory;
import com.android.tv.recommendation.ChannelPreviewUpdater;
import com.android.tv.recommendation.RecordedProgramPreviewUpdater;
import com.android.tv.tunerinputcontroller.BuiltInTunerManager;
import com.android.tv.tunerinputcontroller.TunerInputController;
import com.android.tv.util.AsyncDbTask.DbExecutor;
import com.android.tv.util.SetupUtils;
import com.android.tv.util.TvInputManagerHelper;
import com.android.tv.util.Utils;

import com.google.common.base.Optional;

import dagger.Lazy;

import com.android.tv.common.flags.CloudEpgFlags;
import com.android.tv.common.flags.LegacyFlags;

import java.util.List;
import java.util.concurrent.Executor;

import javax.inject.Inject;

/**
 * TV application.
 *
 * <p>This includes all the Google specific hooks.
 */
public abstract class TvApplication extends BaseApplication implements TvSingletons, Starter {

    protected static final StartupMeasure STARTUP_MEASURE = StartupMeasureFactory.create();
    private static final String TAG = "TvApplication";
    private static final boolean DEBUG = false;

    /**
     * Broadcast Action: The user has updated LC to a new version that supports tuner input. {@link
     * TunerInputController} will receive this intent to check the existence of tuner input when the
     * new version is first launched.
     */
    public static final String ACTION_APPLICATION_FIRST_LAUNCHED =
            " com.android.tv.action.APPLICATION_FIRST_LAUNCHED";

    private static final String PREFERENCE_IS_FIRST_LAUNCH = "is_first_launch";

    private String mVersionName = "";

    private final MainActivityWrapper mMainActivityWrapper = new MainActivityWrapper();

    private SelectInputActivity mSelectInputActivity;
    @Inject Lazy<ChannelDataManager> mChannelDataManager;
    private volatile ProgramDataManager mProgramDataManager;
    private PreviewDataManager mPreviewDataManager;
    @Inject Lazy<DvrManager> mDvrManager;
    private DvrScheduleManager mDvrScheduleManager;
    @Inject Lazy<DvrDataManager> mDvrDataManager;
    private DvrWatchedPositionManager mDvrWatchedPositionManager;
    private RecordingScheduler mRecordingScheduler;
    private RecordingStorageStatusManager mDvrStorageStatusManager;
    @Nullable private InputSessionManager mInputSessionManager;
    // STOP-SHIP: Remove this variable when Tuner Process is split to another application.
    // When this variable is null, we don't know in which process TvApplication runs.
    private Boolean mRunningInMainProcess;
    @Inject Lazy<TvInputManagerHelper> mLazyTvInputManagerHelper;
    private boolean mStarted;
    @Inject EpgFetcher mEpgFetcher;

    @Inject Optional<BuiltInTunerManager> mOptionalBuiltInTunerManager;
    @Inject SetupUtils mSetupUtils;
    @Inject @DbExecutor Executor mDbExecutor;
    @Inject Lazy<EpgReader> mEpgReader;
    @Inject BuildType mBuildType;
    @Inject CloudEpgFlags mCloudEpgFlags;
    @Inject LegacyFlags mLegacyFlags;
    @Inject PerformanceMonitor mPerformanceMonitor;

    @Override
    public void onCreate() {
        if (getSystemService(TvInputManager.class) == null) {
            String msg = "Not an Android TV device.";
            Toast.makeText(this, msg, Toast.LENGTH_LONG);
            Log.wtf(TAG, msg);
            throw new IllegalStateException(msg);
        }
        super.onCreate();
        mPerformanceMonitor.startMemoryMonitor();
        mPerformanceMonitor.startCrashMonitor();
        SharedPreferencesUtils.initialize(
                this,
                () -> {
                    if (mRunningInMainProcess != null && mRunningInMainProcess) {
                        checkTunerServiceOnFirstLaunch();
                    }
                });
        try {
            PackageInfo pInfo = getPackageManager().getPackageInfo(getPackageName(), 0);
            mVersionName = pInfo.versionName;
        } catch (PackageManager.NameNotFoundException e) {
            Log.w(TAG, "Unable to find package '" + getPackageName() + "'.", e);
            mVersionName = "";
        }
        Log.i(TAG, "Starting TV app " + getVersionName());

        // In SetupFragment, transitions are set in the constructor. Because the fragment can be
        // created in Activity.onCreate() by the framework, SetupAnimationHelper should be
        // initialized here before Activity.onCreate() is called.
        SetupAnimationHelper.initialize(this);
        getTvInputManagerHelper();

        Log.i(TAG, "Started TV app " + mVersionName);
        Debug.getTimer(Debug.TAG_START_UP_TIMER).log("finish TvApplication.onCreate");
    }

    /** Initializes application. It is a noop if called twice. */
    @Override
    public void start() {
        if (mStarted) {
            return;
        }
        mStarted = true;
        mRunningInMainProcess = true;
        Debug.getTimer(Debug.TAG_START_UP_TIMER).log("start TvApplication.start");
        if (mRunningInMainProcess) {
            getTvInputManagerHelper()
                    .addCallback(
                            new TvInputCallback() {
                                @Override
                                public void onInputAdded(String inputId) {
                                    if (mOptionalBuiltInTunerManager.isPresent()) {
                                        BuiltInTunerManager builtInTunerManager =
                                                mOptionalBuiltInTunerManager.get();
                                        if (TextUtils.equals(
                                                inputId,
                                                builtInTunerManager.getEmbeddedTunerInputId())) {

                                            builtInTunerManager
                                                    .getTunerInputController()
                                                    .updateTunerInputInfo(TvApplication.this);
                                        }
                                        handleInputCountChanged();
                                    }
                                }

                                @Override
                                public void onInputRemoved(String inputId) {
                                    handleInputCountChanged();
                                }
                            });
            if (mOptionalBuiltInTunerManager.isPresent()) {
                // If the tuner input service is added before the app is started, we need to
                // handle it here.
                mOptionalBuiltInTunerManager
                        .get()
                        .getTunerInputController()
                        .updateTunerInputInfo(TvApplication.this);
            }
            if (CommonFeatures.DVR.isEnabled(this)) {
                mDvrScheduleManager = new DvrScheduleManager(this);
                mRecordingScheduler = RecordingScheduler.createScheduler(this);
            }
            mEpgFetcher.startRoutineService();
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                ChannelPreviewUpdater.getInstance(this).startRoutineService();
                if (CommonFeatures.DVR.isEnabled(this)) {
                    RecordedProgramPreviewUpdater.getInstance(this)
                            .updatePreviewDataForRecordedPrograms();
                }
            }
        }
        Debug.getTimer(Debug.TAG_START_UP_TIMER).log("finish TvApplication.start");
    }

    private void checkTunerServiceOnFirstLaunch() {
        SharedPreferences sharedPreferences =
                this.getSharedPreferences(
                        SharedPreferencesUtils.SHARED_PREF_FEATURES, Context.MODE_PRIVATE);
        boolean isFirstLaunch = sharedPreferences.getBoolean(PREFERENCE_IS_FIRST_LAUNCH, true);
        if (isFirstLaunch) {
            if (DEBUG) Log.d(TAG, "Congratulations, it's the first launch!");
            if (mOptionalBuiltInTunerManager.isPresent()) {
                mOptionalBuiltInTunerManager
                        .get()
                        .getTunerInputController()
                        .onCheckingUsbTunerStatus(this, ACTION_APPLICATION_FIRST_LAUNCHED);
            }
            SharedPreferences.Editor editor = sharedPreferences.edit();
            editor.putBoolean(PREFERENCE_IS_FIRST_LAUNCH, false);
            editor.apply();
        }
    }

    @Override
    public synchronized SetupUtils getSetupUtils() {
        return mSetupUtils;
    }

    /** Returns the {@link DvrManager}. */
    @Override
    @Nullable
    public DvrManager getDvrManager() {
        return (CommonFeatures.DVR.isEnabled(this) && mDvrScheduleManager != null)
                ? mDvrManager.get()
                : null;
    }

    /** Returns the {@link DvrScheduleManager}. */
    @Override
    public DvrScheduleManager getDvrScheduleManager() {
        return mDvrScheduleManager;
    }

    /** Returns the {@link RecordingScheduler}. */
    @Override
    @Nullable
    public RecordingScheduler getRecordingScheduler() {
        return mRecordingScheduler;
    }

    /** Returns the {@link DvrWatchedPositionManager}. */
    @Override
    public DvrWatchedPositionManager getDvrWatchedPositionManager() {
        if (mDvrWatchedPositionManager == null) {
            mDvrWatchedPositionManager = new DvrWatchedPositionManager(this);
        }
        return mDvrWatchedPositionManager;
    }

    @Override
    @TargetApi(Build.VERSION_CODES.N)
    public InputSessionManager getInputSessionManager() {
        if (mInputSessionManager == null) {
            mInputSessionManager = new InputSessionManager(this);
        }
        return mInputSessionManager;
    }

    /** Returns {@link ChannelDataManager}. */
    @Override
    public ChannelDataManager getChannelDataManager() {
        return mChannelDataManager.get();
    }

    /** Returns {@link ProgramDataManager}. */
    @Override
    public ProgramDataManager getProgramDataManager() {
        if (mProgramDataManager != null) {
            return mProgramDataManager;
        }
        Utils.runInMainThreadAndWait(
                () -> {
                    if (mProgramDataManager == null) {
                        mProgramDataManager = new ProgramDataManager(TvApplication.this);
                        mProgramDataManager.start();
                    }
                });
        return mProgramDataManager;
    }

    /** Returns {@link PreviewDataManager}. */
    @TargetApi(Build.VERSION_CODES.O)
    @Override
    public PreviewDataManager getPreviewDataManager() {
        if (mPreviewDataManager == null) {
            mPreviewDataManager = new PreviewDataManager(this);
            mPreviewDataManager.start();
        }
        return mPreviewDataManager;
    }

    /** Returns {@link DvrDataManager}. */
    @TargetApi(Build.VERSION_CODES.N)
    @Override
    public DvrDataManager getDvrDataManager() {
        return mDvrDataManager.get();
    }

    @Override
    @TargetApi(Build.VERSION_CODES.N)
    public RecordingStorageStatusManager getRecordingStorageStatusManager() {
        if (mDvrStorageStatusManager == null) {
            mDvrStorageStatusManager = new DvrStorageStatusManager(this);
        }
        return mDvrStorageStatusManager;
    }

    @Override
    public PerformanceMonitor getPerformanceMonitor() {
        return mPerformanceMonitor;
    }

    /** Returns the main activity information. */
    @Override
    public MainActivityWrapper getMainActivityWrapper() {
        return mMainActivityWrapper;
    }

    /** Returns {@link TvInputManagerHelper}. */
    @Override
    public TvInputManagerHelper getTvInputManagerHelper() {
        return mLazyTvInputManagerHelper.get();
    }

    @Override
    public boolean isRunningInMainProcess() {
        return mRunningInMainProcess != null && mRunningInMainProcess;
    }

    /**
     * SelectInputActivity is set in {@link SelectInputActivity#onCreate} and cleared in {@link
     * SelectInputActivity#onDestroy}.
     */
    public void setSelectInputActivity(SelectInputActivity activity) {
        mSelectInputActivity = activity;
    }

    public void handleGuideKey() {
        if (!mMainActivityWrapper.isResumed()) {
            startActivity(
                    new Intent(Intent.ACTION_VIEW, Programs.CONTENT_URI)
                            .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
        } else {
            mMainActivityWrapper.getMainActivity().getOverlayManager().toggleProgramGuide();
        }
    }

    /** Handles the global key KEYCODE_TV. */
    public void handleTvKey() {
        if (!mMainActivityWrapper.isResumed()) {
            startMainActivity(null);
        }
    }

    /** Handles the global key KEYCODE_DVR. */
    public void handleDvrKey() {
        startActivity(
                new Intent(this, DvrBrowseActivity.class).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
    }

    /** Handles the global key KEYCODE_TV_INPUT. */
    public void handleTvInputKey() {
        TvInputManager tvInputManager = (TvInputManager) getSystemService(Context.TV_INPUT_SERVICE);
        List<TvInputInfo> tvInputs = tvInputManager.getTvInputList();
        int inputCount = 0;
        boolean hasTunerInput = false;
        for (TvInputInfo input : tvInputs) {
            if (input.isPassthroughInput()) {
                if (!input.isHidden(this)) {
                    ++inputCount;
                }
            } else if (!hasTunerInput) {
                hasTunerInput = true;
                ++inputCount;
            }
        }

        if (inputCount < 1) {
            Log.w(TAG, "No available input to be selected.");
            return;
        }

        if (mMainActivityWrapper.isResumed() && inputCount < 2) {
            // if no other inputs can be switched to, keep in the same input
            return;
        }

        Activity activityToHandle =
                mMainActivityWrapper.isResumed()
                        ? mMainActivityWrapper.getMainActivity()
                        : mSelectInputActivity;
        if (activityToHandle != null) {
            // If startActivity is called, MainActivity.onPause is unnecessarily called. To
            // prevent it, MainActivity.dispatchKeyEvent is directly called.
            activityToHandle.dispatchKeyEvent(
                    new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_TV_INPUT));
            activityToHandle.dispatchKeyEvent(
                    new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_TV_INPUT));
        } else if (mMainActivityWrapper.isStarted()) {
            Bundle extras = new Bundle();
            extras.putString(Utils.EXTRA_KEY_ACTION, Utils.EXTRA_ACTION_SHOW_TV_INPUT);
            startMainActivity(extras);
        } else {
            startActivity(
                    new Intent(this, SelectInputActivity.class)
                            .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
        }
    }

    private void startMainActivity(Bundle extras) {
        // The use of FLAG_ACTIVITY_NEW_TASK enables arbitrary applications to access the intent
        // sent to the root activity. Having said that, we should be fine here since such an intent
        // does not carry any important user data.
        Intent intent =
                new Intent(this, MainActivity.class).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        if (extras != null) {
            intent.putExtras(extras);
        }
        startActivity(intent);
    }

    /**
     * Returns the version name of the TV app.
     *
     * @see PackageInfo#versionName
     */
    public String getVersionName() {
        return mVersionName;
    }

    /**
     * Checks the input counts and enable/disable TvActivity. Also upda162 the input list in {@link
     * SetupUtils}.
     */
    @Override
    public void handleInputCountChanged() {
        handleInputCountChanged(false, false, false);
    }

    /**
     * Checks the input counts and enable/disable TvActivity. Also updates the input list in {@link
     * SetupUtils}.
     *
     * @param calledByTunerServiceChanged true if it is called when BaseTunerTvInputService is
     *     enabled or disabled.
     * @param tunerServiceEnabled it's available only when calledByTunerServiceChanged is true.
     * @param dontKillApp when TvActivity is enabled or disabled by this method, the app restarts by
     *     default. But, if dontKillApp is true, the app won't restart.
     */
    public void handleInputCountChanged(
            boolean calledByTunerServiceChanged, boolean tunerServiceEnabled, boolean dontKillApp) {
        TvInputManager inputManager = (TvInputManager) getSystemService(Context.TV_INPUT_SERVICE);
        boolean enable =
                (calledByTunerServiceChanged && tunerServiceEnabled)
                        || TvFeatures.UNHIDE.isEnabled(TvApplication.this);
        if (!enable) {
            List<TvInputInfo> inputs = inputManager.getTvInputList();
            boolean skipTunerInputCheck = false;
            Optional<String> optionalEmbeddedTunerInputId =
                    mOptionalBuiltInTunerManager.transform(
                            BuiltInTunerManager::getEmbeddedTunerInputId);
            // If there is only play movies trailer input, we don't handle input count change.
            final String playMoviesInputIdPrefix = "com.google.android.videos/";
            int tunerInputCount = 0;
            boolean hasPlayMoviesInput = false;
            for (TvInputInfo input : inputs) {
                if (calledByTunerServiceChanged
                        && !tunerServiceEnabled
                        && optionalEmbeddedTunerInputId.isPresent()
                        && optionalEmbeddedTunerInputId.get().equals(input.getId())) {
                    continue;
                }
                if (input.getType() == TvInputInfo.TYPE_TUNER) {
                    if (DEBUG) Log.d(TAG, "Tuner input: " + input.getId());
                    ++tunerInputCount;
                    if (input.getId().startsWith(playMoviesInputIdPrefix)) {
                        hasPlayMoviesInput = true;
                    }
                }
            }
            if (DEBUG) {
                Log.d(
                        TAG,
                        "Input count: "
                                + tunerInputCount
                                + " hasPlayMoviesChannel: "
                                + hasPlayMoviesInput);
            }
            if (tunerInputCount == 1 && hasPlayMoviesInput) {
                if (DEBUG) Log.d(TAG, "There is only play movies input");
                skipTunerInputCheck = true;
            }
            // Enable the TvActivity only if there is at least one tuner type input.
            if (!skipTunerInputCheck) {
                for (TvInputInfo input : inputs) {
                    if (calledByTunerServiceChanged
                            && !tunerServiceEnabled
                            && optionalEmbeddedTunerInputId.isPresent()
                            && optionalEmbeddedTunerInputId.get().equals(input.getId())) {
                        continue;
                    }
                    if (input.getType() == TvInputInfo.TYPE_TUNER) {
                        enable = true;
                        break;
                    }
                }
            }
            if (DEBUG) Log.d(TAG, "Enable MainActivity: " + enable);
        }
        PackageManager packageManager = getPackageManager();
        ComponentName name = new ComponentName(this, TvActivity.class);
        int newState =
                enable
                        ? PackageManager.COMPONENT_ENABLED_STATE_ENABLED
                        : PackageManager.COMPONENT_ENABLED_STATE_DISABLED;
        if (packageManager.getComponentEnabledSetting(name) != newState) {
            packageManager.setComponentEnabledSetting(
                    name, newState, dontKillApp ? PackageManager.DONT_KILL_APP : 0);
            Log.i(TAG, (enable ? "Un-hide" : "Hide") + " TV app.");
        }
        mSetupUtils.onInputListUpdated(inputManager);
    }

    @Override
    @DbExecutor
    public Executor getDbExecutor() {
        return mDbExecutor;
    }

    @Override
    public Lazy<EpgReader> providesEpgReader() {
        return mEpgReader;
    }

    @Override
    public BuildType getBuildType() {
        return mBuildType;
    }
}