/*
 * 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.app.Application;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.media.tv.TvContract;
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.os.StrictMode;
import android.support.annotation.Nullable;
import android.support.v4.os.BuildCompat;
import android.util.Log;
import android.view.KeyEvent;

import com.android.tv.analytics.Analytics;
import com.android.tv.analytics.StubAnalytics;
import com.android.tv.analytics.StubAnalytics;
import com.android.tv.analytics.Tracker;
import com.android.tv.common.BuildConfig;
import com.android.tv.common.SharedPreferencesUtils;
import com.android.tv.common.TvCommonUtils;
import com.android.tv.common.feature.CommonFeatures;
import com.android.tv.common.ui.setup.animation.SetupAnimationHelper;
import com.android.tv.data.ChannelDataManager;
import com.android.tv.data.ProgramDataManager;
import com.android.tv.dvr.DvrDataManager;
import com.android.tv.dvr.DvrDataManagerImpl;
import com.android.tv.dvr.DvrManager;
import com.android.tv.dvr.DvrRecordingService;
import com.android.tv.dvr.DvrSessionManager;
import com.android.tv.util.Clock;
import com.android.tv.util.SetupUtils;
import com.android.tv.util.SystemProperties;
import com.android.tv.util.TvInputManagerHelper;
import com.android.tv.util.Utils;
import com.android.usbtuner.UsbTunerPreferences;
import com.android.usbtuner.setup.TunerSetupActivity;
import com.android.usbtuner.tvinput.UsbTunerTvInputService;

import java.util.List;

public class TvApplication extends Application implements ApplicationSingletons {
    private static final String TAG = "TvApplication";
    private static final boolean DEBUG = false;

    /**
     * Returns the @{@link ApplicationSingletons} using the application context.
     */
    public static ApplicationSingletons getSingletons(Context context) {
        return (ApplicationSingletons) context.getApplicationContext();
    }
    private String mVersionName = "";

    private final MainActivityWrapper mMainActivityWrapper = new MainActivityWrapper();

    private SelectInputActivity mSelectInputActivity;
    private Analytics mAnalytics;
    private Tracker mTracker;
    private TvInputManagerHelper mTvInputManagerHelper;
    private ChannelDataManager mChannelDataManager;
    private ProgramDataManager mProgramDataManager;
    private DvrManager mDvrManager;
    private DvrDataManager mDvrDataManager;
    @Nullable
    private DvrSessionManager mDvrSessionManager;

    @Override
    public void onCreate() {
        super.onCreate();
        SharedPreferencesUtils.initialize(this);
        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 Live TV " + getVersionName());
        // Only set StrictMode for ENG builds because the build server only produces userdebug
        // builds.
        if (BuildConfig.ENG && SystemProperties.ALLOW_STRICT_MODE.getValue()) {
            StrictMode.setThreadPolicy(
                    new StrictMode.ThreadPolicy.Builder().detectAll().penaltyLog().build());
            StrictMode.VmPolicy.Builder vmPolicyBuilder = new StrictMode.VmPolicy.Builder()
                    .detectAll().penaltyLog();
            if (BuildConfig.ENG && SystemProperties.ALLOW_DEATH_PENALTY.getValue() &&
                    !TvCommonUtils.isRunningInTest()) {
                // TODO turn on death penalty for tests when they stop leaking MainActivity
            }
            StrictMode.setVmPolicy(vmPolicyBuilder.build());
        }
        if (BuildConfig.ENG && !SystemProperties.ALLOW_ANALYTICS_IN_ENG.getValue()) {
            mAnalytics = StubAnalytics.getInstance(this);
        } else {
            mAnalytics = StubAnalytics.getInstance(this);
        }
        mTracker = mAnalytics.getDefaultTracker();
        mTvInputManagerHelper = new TvInputManagerHelper(this);
        mTvInputManagerHelper.start();
        mTvInputManagerHelper.addCallback(new TvInputCallback() {
            @Override
            public void onInputAdded(String inputId) {
                handleInputCountChanged();
            }

            @Override
            public void onInputRemoved(String inputId) {
                handleInputCountChanged();
            }
        });
        if (CommonFeatures.DVR.isEnabled(this) && BuildCompat.isAtLeastN()) {
            mDvrManager = new DvrManager(this);
            //NOTE: DvrRecordingService just keeps running.
            DvrRecordingService.startService(this);
        }
        // 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);
        if (DEBUG) Log.i(TAG, "Started Live TV " + mVersionName);
    }

    /**
     * Returns the {@link DvrManager}.
     */
    @Override
    public DvrManager getDvrManager() {
        return mDvrManager;
    }

    @Override
    @TargetApi(Build.VERSION_CODES.N)
    public DvrSessionManager getDvrSessionManger() {
        if (mDvrSessionManager == null) {
            mDvrSessionManager = new DvrSessionManager(this);
        }
        return mDvrSessionManager;
    }

    /**
     * Returns the {@link Analytics}.
     */
    @Override
    public Analytics getAnalytics() {
        return mAnalytics;
    }

    /**
     * Returns the default tracker.
     */
    @Override
    public Tracker getTracker() {
        return mTracker;
    }


    /**
     * Returns {@link ChannelDataManager}.
     */
    @Override
    public ChannelDataManager getChannelDataManager() {
        if (mChannelDataManager == null) {
            mChannelDataManager = new ChannelDataManager(this, mTvInputManagerHelper);
            mChannelDataManager.start();
        }
        return mChannelDataManager;
    }

    /**
     * Returns {@link ProgramDataManager}.
     */
    @Override
    public ProgramDataManager getProgramDataManager() {
        if (mProgramDataManager == null) {
            mProgramDataManager = new ProgramDataManager(this);
            mProgramDataManager.start();
        }
        return mProgramDataManager;
    }

    /**
     * Returns {@link DvrDataManager}.
     */
    @TargetApi(Build.VERSION_CODES.N)
    @Override
    public DvrDataManager getDvrDataManager() {
        if (mDvrDataManager == null) {
                DvrDataManagerImpl dvrDataManager = new DvrDataManagerImpl(this, Clock.SYSTEM);
                mDvrDataManager = dvrDataManager;
                dvrDataManager.start();
        }
        return mDvrDataManager;
    }

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

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

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

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

    /**
     * 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 < 2) {
            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 live channels.
     *
     * @see PackageInfo#versionName
     */
    public String getVersionName() {
        return mVersionName;
    }

    /**
     * Checks the input counts and enable/disable TvActivity. Also updates the input list in
     * {@link SetupUtils}.
     */
    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 UsbTunerTvInputService
     *        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)
                || Features.UNHIDE.isEnabled(TvApplication.this);
        if (!enable) {
            List<TvInputInfo> inputs = inputManager.getTvInputList();
            boolean skipTunerInputCheck = false;
            // Enable the TvActivity only if there is at least one tuner type input.
            if (!skipTunerInputCheck) {
                for (TvInputInfo input : inputs) {
                    if (calledByTunerServiceChanged && !tunerServiceEnabled
                            && UsbTunerTvInputService.getInputId(this).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);
        }
        SetupUtils.getInstance(TvApplication.this).onInputListUpdated(inputManager);
    }
}