package com.android.systemui.assist;

import android.app.ActivityManager;
import android.app.ActivityOptions;
import android.app.SearchManager;
import android.content.ActivityNotFoundException;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.database.ContentObserver;
import android.graphics.PixelFormat;
import android.media.AudioAttributes;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.RemoteException;
import android.os.UserHandle;
import android.provider.Settings;
import android.service.voice.VoiceInteractionSession;
import android.util.Log;
import android.view.Gravity;
import android.view.HapticFeedbackConstants;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.ImageView;

import com.android.internal.app.AssistUtils;
import com.android.internal.app.IVoiceInteractionSessionShowCallback;
import com.android.systemui.R;
import com.android.systemui.statusbar.BaseStatusBar;
import com.android.systemui.statusbar.CommandQueue;
import com.android.systemui.statusbar.phone.PhoneStatusBar;

import java.io.FileDescriptor;
import java.io.PrintWriter;

/**
 * Class to manage everything related to assist in SystemUI.
 */
public class AssistManager {

    private static final String TAG = "AssistManager";
    private static final String ASSIST_ICON_METADATA_NAME =
            "com.android.systemui.action_assist_icon";

    private static final long TIMEOUT_SERVICE = 2500;
    private static final long TIMEOUT_ACTIVITY = 1000;

    private final Context mContext;
    private final WindowManager mWindowManager;
    private final AssistDisclosure mAssistDisclosure;

    private AssistOrbContainer mView;
    private final BaseStatusBar mBar;
    private final AssistUtils mAssistUtils;

    private ComponentName mAssistComponent;

    private IVoiceInteractionSessionShowCallback mShowCallback =
            new IVoiceInteractionSessionShowCallback.Stub() {

        @Override
        public void onFailed() throws RemoteException {
            mView.post(mHideRunnable);
        }

        @Override
        public void onShown() throws RemoteException {
            mView.post(mHideRunnable);
        }
    };

    private Runnable mHideRunnable = new Runnable() {
        @Override
        public void run() {
            mView.removeCallbacks(this);
            mView.show(false /* show */, true /* animate */);
        }
    };

    private final ContentObserver mAssistSettingsObserver = new ContentObserver(new Handler()) {
        @Override
        public void onChange(boolean selfChange) {
            updateAssistInfo();
        }
    };

    public AssistManager(BaseStatusBar bar, Context context) {
        mContext = context;
        mBar = bar;
        mWindowManager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
        mAssistUtils = new AssistUtils(context);

        mContext.getContentResolver().registerContentObserver(
                Settings.Secure.getUriFor(Settings.Secure.ASSISTANT), false,
                mAssistSettingsObserver);
        mAssistSettingsObserver.onChange(false);
        mAssistDisclosure = new AssistDisclosure(context, new Handler());
    }

    public void onConfigurationChanged() {
        boolean visible = false;
        if (mView != null) {
            visible = mView.isShowing();
            mWindowManager.removeView(mView);
        }

        mView = (AssistOrbContainer) LayoutInflater.from(mContext).inflate(
                R.layout.assist_orb, null);
        mView.setVisibility(View.GONE);
        mView.setSystemUiVisibility(
                View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION);
        WindowManager.LayoutParams lp = getLayoutParams();
        mWindowManager.addView(mView, lp);
        if (visible) {
            mView.show(true /* show */, false /* animate */);
        }
    }

    public void startAssist(Bundle args) {
        updateAssistInfo();
        if (mAssistComponent == null) {
            return;
        }

        final boolean isService = isAssistantService();
        if (!isService || !isVoiceSessionRunning()) {
            showOrb();
            mView.postDelayed(mHideRunnable, isService
                    ? TIMEOUT_SERVICE
                    : TIMEOUT_ACTIVITY);
        }
        startAssistInternal(args);
    }

    public void hideAssist() {
        mAssistUtils.hideCurrentSession();
    }

    private WindowManager.LayoutParams getLayoutParams() {
        WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                mContext.getResources().getDimensionPixelSize(R.dimen.assist_orb_scrim_height),
                WindowManager.LayoutParams.TYPE_VOICE_INTERACTION_STARTING,
                WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
                        | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
                        | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                PixelFormat.TRANSLUCENT);
        if (ActivityManager.isHighEndGfx()) {
            lp.flags |= WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED;
        }
        lp.gravity = Gravity.BOTTOM | Gravity.START;
        lp.setTitle("AssistPreviewPanel");
        lp.softInputMode = WindowManager.LayoutParams.SOFT_INPUT_STATE_UNCHANGED
                | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_NOTHING;
        return lp;
    }

    private void showOrb() {
        maybeSwapSearchIcon();
        mView.show(true /* show */, true /* animate */);
    }

    private void startAssistInternal(Bundle args) {
        if (mAssistComponent != null) {
            if (isAssistantService()) {
                startVoiceInteractor(args);
            } else {
                startAssistActivity(args);
            }
        }
    }

    private void startAssistActivity(Bundle args) {
        if (!mBar.isDeviceProvisioned()) {
            return;
        }

        // Close Recent Apps if needed
        mBar.animateCollapsePanels(CommandQueue.FLAG_EXCLUDE_SEARCH_PANEL |
                CommandQueue.FLAG_EXCLUDE_RECENTS_PANEL);

        boolean structureEnabled = Settings.Secure.getIntForUser(mContext.getContentResolver(),
                Settings.Secure.ASSIST_STRUCTURE_ENABLED, 1, UserHandle.USER_CURRENT) != 0;

        final Intent intent = ((SearchManager) mContext.getSystemService(Context.SEARCH_SERVICE))
                .getAssistIntent(structureEnabled);
        if (intent == null) {
            return;
        }
        if (mAssistComponent != null) {
            intent.setComponent(mAssistComponent);
        }
        intent.putExtras(args);

        if (structureEnabled) {
            showDisclosure();
        }

        try {
            final ActivityOptions opts = ActivityOptions.makeCustomAnimation(mContext,
                    R.anim.search_launch_enter, R.anim.search_launch_exit);
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            AsyncTask.execute(new Runnable() {
                @Override
                public void run() {
                    mContext.startActivityAsUser(intent, opts.toBundle(),
                            new UserHandle(UserHandle.USER_CURRENT));
                }
            });
        } catch (ActivityNotFoundException e) {
            Log.w(TAG, "Activity not found for " + intent.getAction());
        }
    }

    private void startVoiceInteractor(Bundle args) {
        mAssistUtils.showSessionForActiveService(args,
                VoiceInteractionSession.SHOW_SOURCE_ASSIST_GESTURE, mShowCallback, null);
    }

    public void launchVoiceAssistFromKeyguard() {
        mAssistUtils.launchVoiceAssistFromKeyguard();
    }

    public boolean canVoiceAssistBeLaunchedFromKeyguard() {
        return mAssistUtils.activeServiceSupportsLaunchFromKeyguard();
    }

    public ComponentName getVoiceInteractorComponentName() {
        return mAssistUtils.getActiveServiceComponentName();
    }

    private boolean isVoiceSessionRunning() {
        return mAssistUtils.isSessionRunning();
    }

    public void destroy() {
        mWindowManager.removeViewImmediate(mView);
    }

    private void maybeSwapSearchIcon() {
        if (mAssistComponent != null) {
            replaceDrawable(mView.getOrb().getLogo(), mAssistComponent, ASSIST_ICON_METADATA_NAME,
                    isAssistantService());
        } else {
            mView.getOrb().getLogo().setImageDrawable(null);
        }
    }

    public void replaceDrawable(ImageView v, ComponentName component, String name,
            boolean isService) {
        if (component != null) {
            try {
                PackageManager packageManager = mContext.getPackageManager();
                // Look for the search icon specified in the activity meta-data
                Bundle metaData = isService
                        ? packageManager.getServiceInfo(
                                component, PackageManager.GET_META_DATA).metaData
                        : packageManager.getActivityInfo(
                                component, PackageManager.GET_META_DATA).metaData;
                if (metaData != null) {
                    int iconResId = metaData.getInt(name);
                    if (iconResId != 0) {
                        Resources res = packageManager.getResourcesForApplication(
                                component.getPackageName());
                        v.setImageDrawable(res.getDrawable(iconResId));
                        return;
                    }
                }
            } catch (PackageManager.NameNotFoundException e) {
                Log.w(TAG, "Failed to swap drawable; "
                        + component.flattenToShortString() + " not found", e);
            } catch (Resources.NotFoundException nfe) {
                Log.w(TAG, "Failed to swap drawable from "
                        + component.flattenToShortString(), nfe);
            }
        }
        v.setImageDrawable(null);
    }

    private boolean isAssistantService() {
        return mAssistComponent == null ?
                false : mAssistComponent.equals(getVoiceInteractorComponentName());
    }

    private void updateAssistInfo() {
        mAssistComponent = mAssistUtils.getAssistComponentForUser(UserHandle.USER_CURRENT);
    }

    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        pw.println("AssistManager state:");
        pw.print("  mAssistComponent="); pw.println(mAssistComponent);
    }

    public void showDisclosure() {
        mAssistDisclosure.postShow();
    }

    public void onUserSwitched(int newUserId) {
        updateAssistInfo();
    }

    public void onLockscreenShown() {
        mAssistUtils.onLockscreenShown();
    }
}