/*
 * Copyright (C) 2019 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.wallpaper.picker;

import static android.view.View.IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS;
import static android.view.View.IMPORTANT_FOR_ACCESSIBILITY_YES;

import static com.android.wallpaper.widget.BottomActionBar.BottomAction.APPLY;
import static com.android.wallpaper.widget.BottomActionBar.BottomAction.CUSTOMIZE;
import static com.android.wallpaper.widget.BottomActionBar.BottomAction.DELETE;
import static com.android.wallpaper.widget.BottomActionBar.BottomAction.EDIT;
import static com.android.wallpaper.widget.BottomActionBar.BottomAction.INFORMATION;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.WallpaperColors;
import android.app.WallpaperInfo;
import android.app.WallpaperManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.pm.ServiceInfo;
import android.graphics.Point;
import android.net.Uri;
import android.os.Bundle;
import android.os.RemoteException;
import android.service.wallpaper.IWallpaperConnection;
import android.service.wallpaper.WallpaperService;
import android.service.wallpaper.WallpaperSettingsActivity;
import android.text.TextUtils;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.cardview.widget.CardView;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.constraintlayout.widget.ConstraintSet;
import androidx.lifecycle.LiveData;
import androidx.slice.Slice;
import androidx.slice.widget.SliceLiveData;
import androidx.slice.widget.SliceView;

import com.android.wallpaper.R;
import com.android.wallpaper.compat.BuildCompat;
import com.android.wallpaper.model.SetWallpaperViewModel;
import com.android.wallpaper.util.FullScreenAnimation;
import com.android.wallpaper.util.ResourceUtils;
import com.android.wallpaper.util.ScreenSizeCalculator;
import com.android.wallpaper.util.SizeCalculator;
import com.android.wallpaper.util.WallpaperConnection;
import com.android.wallpaper.util.WallpaperSurfaceCallback;
import com.android.wallpaper.widget.BottomActionBar;
import com.android.wallpaper.widget.BottomActionBar.AccessibilityCallback;
import com.android.wallpaper.widget.BottomActionBar.BottomSheetContent;
import com.android.wallpaper.widget.LockScreenPreviewer;
import com.android.wallpaper.widget.WallpaperColorsLoader;

import java.util.Locale;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * Fragment which displays the UI for previewing an individual live wallpaper, its attribution
 * information and settings slices if available.
 */
public class LivePreviewFragment extends PreviewFragment implements
        WallpaperConnection.WallpaperConnectionListener {

    public static final String EXTRA_LIVE_WALLPAPER_INFO = "android.live_wallpaper.info";
    public static final String KEY_ACTION_DELETE_LIVE_WALLPAPER = "action_delete_live_wallpaper";

    private static final String TAG = "LivePreviewFragment";

    /**
     * Instance of {@link WallpaperConnection} used to bind to the live wallpaper service to show
     * it in this preview fragment.
     * @see IWallpaperConnection
     */
    protected WallpaperConnection mWallpaperConnection;
    protected CardView mHomePreviewCard;
    protected SurfaceView mWorkspaceSurface;
    protected WallpaperSurfaceCallback mWallpaperSurfaceCallback;
    protected WorkspaceSurfaceHolderCallback mWorkspaceSurfaceCallback;
    protected ViewGroup mLockPreviewContainer;
    protected LockScreenPreviewer mLockScreenPreviewer;

    private Intent mDeleteIntent;
    private Intent mSettingsIntent;
    private SliceView mSettingsSliceView;
    private LiveData<Slice> mSettingsLiveData;
    private Point mScreenSize;
    private ViewGroup mPreviewContainer;
    private TouchForwardingLayout mTouchForwardingLayout;
    private SurfaceView mWallpaperSurface;
    private Future<Integer> mPlaceholderColorFuture;
    private WallpaperColors mWallpaperColors;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        android.app.WallpaperInfo info = mWallpaper.getWallpaperComponent();
        mPlaceholderColorFuture = mWallpaper.computePlaceholderColor(getContext());

        String deleteAction = getDeleteAction(info);
        if (!TextUtils.isEmpty(deleteAction)) {
            mDeleteIntent = new Intent(deleteAction);
            mDeleteIntent.setPackage(info.getPackageName());
            mDeleteIntent.putExtra(EXTRA_LIVE_WALLPAPER_INFO, info);
        }
        String settingsActivity = getSettingsActivity(info);
        if (settingsActivity != null) {
            mSettingsIntent = new Intent();
            mSettingsIntent.setComponent(new ComponentName(info.getPackageName(),
                    settingsActivity));
            mSettingsIntent.putExtra(WallpaperSettingsActivity.EXTRA_PREVIEW_MODE, true);
            PackageManager pm = requireContext().getPackageManager();
            ActivityInfo activityInfo = mSettingsIntent.resolveActivityInfo(pm, 0);
            if (activityInfo == null) {
                Log.i(TAG, "Couldn't find wallpaper settings activity: " + settingsActivity);
                mSettingsIntent = null;
            }
        }
    }

    @Nullable
    protected String getSettingsActivity(WallpaperInfo info) {
        return info.getSettingsActivity();
    }

    protected Intent getWallpaperIntent(WallpaperInfo info) {
        return new Intent(WallpaperService.SERVICE_INTERFACE)
                .setClassName(info.getPackageName(), info.getServiceName());
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = super.onCreateView(inflater, container, savedInstanceState);

        Activity activity = requireActivity();
        mScreenSize = ScreenSizeCalculator.getInstance().getScreenSize(
                activity.getWindowManager().getDefaultDisplay());
        mPreviewContainer = view.findViewById(R.id.live_wallpaper_preview);
        mTouchForwardingLayout = view.findViewById(R.id.touch_forwarding_layout);
        // Set aspect ratio on the preview card.
        ConstraintSet set = new ConstraintSet();
        set.clone((ConstraintLayout) mPreviewContainer);
        String ratio = String.format(Locale.US, "%d:%d", mScreenSize.x, mScreenSize.y);
        set.setDimensionRatio(mTouchForwardingLayout.getId(), ratio);
        set.applyTo((ConstraintLayout) mPreviewContainer);

        mHomePreviewCard = mPreviewContainer.findViewById(R.id.wallpaper_full_preview_card);
        mLockPreviewContainer = mPreviewContainer.findViewById(R.id.lock_screen_preview_container);
        mLockScreenPreviewer = new LockScreenPreviewer(getLifecycle(), getContext(),
                mLockPreviewContainer);
        mLockScreenPreviewer.setDateViewVisibility(!mFullScreenAnimation.isFullScreen());
        mFullScreenAnimation.setFullScreenStatusListener(
                isFullScreen -> mLockScreenPreviewer.setDateViewVisibility(!isFullScreen));
        mWallpaperSurface = mHomePreviewCard.findViewById(R.id.wallpaper_surface);
        mTouchForwardingLayout.setTargetView(mHomePreviewCard);
        mTouchForwardingLayout.setForwardingEnabled(true);
        mWorkspaceSurface = mHomePreviewCard.findViewById(R.id.workspace_surface);

        mWorkspaceSurfaceCallback = createWorkspaceSurfaceCallback(mWorkspaceSurface);
        mWallpaperSurfaceCallback = new WallpaperSurfaceCallback(getContext(),
                mHomePreviewCard, mWallpaperSurface, mPlaceholderColorFuture, null);

        setUpTabs(view.findViewById(R.id.separated_tabs));

        view.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
            @Override
            public void onLayoutChange(View thisView, int left, int top, int right, int bottom,
                    int oldLeft, int oldTop, int oldRight, int oldBottom) {
                mHomePreviewCard.setRadius(SizeCalculator.getPreviewCornerRadius(activity,
                        mHomePreviewCard.getMeasuredWidth()));
                view.removeOnLayoutChangeListener(this);
            }
        });

        return view;
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        updateWallpaperSurface();
        setupCurrentWallpaperPreview();
        renderWorkspaceSurface();
    }

    private void updateWallpaperSurface() {
        mWallpaperSurface.getHolder().addCallback(mWallpaperSurfaceCallback);
        mWallpaperSurface.setZOrderMediaOverlay(true);
    }

    @Override
    protected void updateScreenPreview(boolean isHomeSelected) {
        mWorkspaceSurface.setVisibility(isHomeSelected ? View.VISIBLE : View.INVISIBLE);

        mLockPreviewContainer.setVisibility(isHomeSelected ? View.INVISIBLE : View.VISIBLE);

        mFullScreenAnimation.setIsHomeSelected(isHomeSelected);
    }

    private void setupCurrentWallpaperPreview() {
        mHomePreviewCard.setOnTouchListener((v, ev) -> {
            if (mWallpaperConnection != null && mWallpaperConnection.getEngine() != null) {
                float scaleRatio =
                        (float) mTouchForwardingLayout.getWidth() / (float) mScreenSize.x;
                int action = ev.getActionMasked();
                if (action == MotionEvent.ACTION_DOWN) {
                    mBottomActionBar.collapseBottomSheetIfExpanded();
                }
                MotionEvent dup = MotionEvent.obtainNoHistory(ev);
                dup.setLocation(ev.getX() / scaleRatio, ev.getY() / scaleRatio);
                try {
                    mWallpaperConnection.getEngine().dispatchPointer(dup);
                    if (action == MotionEvent.ACTION_UP) {
                        mWallpaperConnection.getEngine().dispatchWallpaperCommand(
                                WallpaperManager.COMMAND_TAP,
                                (int) ev.getX(), (int) ev.getY(), 0, null);
                    } else if (action == MotionEvent.ACTION_POINTER_UP) {
                        int pointerIndex = ev.getActionIndex();
                        mWallpaperConnection.getEngine().dispatchWallpaperCommand(
                                WallpaperManager.COMMAND_SECONDARY_TAP,
                                (int) ev.getX(pointerIndex), (int) ev.getY(pointerIndex), 0, null);
                    }
                } catch (RemoteException e) {
                    Log.e(TAG, "Remote exception of wallpaper connection");
                }
            }
            return false;
        });
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        if (mSettingsLiveData != null && mSettingsLiveData.hasObservers()
                && mSettingsSliceView != null) {
            mSettingsLiveData.removeObserver(mSettingsSliceView);
            mSettingsLiveData = null;
        }
        if (mWallpaperConnection != null) {
            mWallpaperConnection.disconnect();
            mWallpaperConnection = null;
        }
        if (mLockScreenPreviewer != null) {
            mLockScreenPreviewer.release();
        }
        mWorkspaceSurfaceCallback.cleanUp();
        mWorkspaceSurface.getHolder().removeCallback(mWorkspaceSurfaceCallback);
        mWallpaperSurfaceCallback.cleanUp();
        mWallpaperSurface.getHolder().removeCallback(mWallpaperSurfaceCallback);
    }

    protected void previewLiveWallpaper(ImageView thumbnailView) {
        mWallpaperSurface.post(() -> {
            Activity activity = getActivity();
            if (activity == null) {
                return;
            }
            if (mWallpaperSurfaceCallback.getHomeImageWallpaper() != null) {
                Integer placeholderColor = null;
                try {
                    placeholderColor = mPlaceholderColorFuture.get(50, TimeUnit.MILLISECONDS);
                } catch (InterruptedException | ExecutionException | TimeoutException e) {
                    Log.i(TAG, "Couldn't obtain placeholder color", e);
                }
                mWallpaper.getThumbAsset(activity.getApplicationContext())
                        .loadLowResDrawable(activity,
                                mWallpaperSurfaceCallback.getHomeImageWallpaper(),
                                placeholderColor != null
                                        ? placeholderColor
                                        : ResourceUtils.getColorAttr(activity,
                                                android.R.attr.colorBackground),
                                mPreviewBitmapTransformation);
            }
            setUpLiveWallpaperPreview(mWallpaper);
        });
    }

    protected void setUpLiveWallpaperPreview(
            com.android.wallpaper.model.WallpaperInfo homeWallpaper) {
        Activity activity = getActivity();
        if (activity == null || activity.isFinishing()) {
            return;
        }
        if (mWallpaperConnection != null) {
            mWallpaperConnection.disconnect();
        }

        if (WallpaperConnection.isPreviewAvailable()) {
            mWallpaperConnection = new WallpaperConnection(
                    getWallpaperIntent(homeWallpaper.getWallpaperComponent()),
                    activity,
                    /* listener= */ this,
                    mWallpaperSurface);

            mWallpaperConnection.setVisibility(true);
        } else {
            WallpaperColorsLoader.getWallpaperColors(
                    activity,
                    homeWallpaper.getThumbAsset(activity),
                    colors -> onWallpaperColorsChanged(colors, 0));
        }
        if (mWallpaperConnection != null && !mWallpaperConnection.connect()) {
            mWallpaperConnection = null;
        }
    }

    private void renderWorkspaceSurface() {
        mWorkspaceSurface.setZOrderMediaOverlay(true);
        mWorkspaceSurface.getHolder().addCallback(mWorkspaceSurfaceCallback);
    }

    @Override
    protected void onBottomActionBarReady(BottomActionBar bottomActionBar) {
        super.onBottomActionBarReady(bottomActionBar);
        mBottomActionBar.showActionsOnly(INFORMATION, DELETE, EDIT, CUSTOMIZE, APPLY);
        mBottomActionBar.setActionClickListener(APPLY, unused -> onSetWallpaperClicked(null));
        mBottomActionBar.bindBottomSheetContentWithAction(
                new WallpaperInfoContent(getContext()), INFORMATION);

        View separatedTabsContainer = getView().findViewById(R.id.separated_tabs_container);
        // Update target view's accessibility param since it will be blocked by the bottom sheet
        // when expanded.
        mBottomActionBar.setAccessibilityCallback(new AccessibilityCallback() {
            @Override
            public void onBottomSheetCollapsed() {
                mPreviewContainer.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES);
                separatedTabsContainer.setImportantForAccessibility(
                        IMPORTANT_FOR_ACCESSIBILITY_YES);
            }

            @Override
            public void onBottomSheetExpanded() {
                mPreviewContainer.setImportantForAccessibility(
                        IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS);
                separatedTabsContainer.setImportantForAccessibility(
                        IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS);
            }
        });
        final Uri uriSettingsSlice = getSettingsSliceUri(mWallpaper.getWallpaperComponent());
        if (uriSettingsSlice != null) {
            mSettingsLiveData = SliceLiveData.fromUri(requireContext(), uriSettingsSlice);
            mBottomActionBar.bindBottomSheetContentWithAction(
                    new PreviewCustomizeSettingsContent(getContext()), CUSTOMIZE);
        } else {
            if (mSettingsIntent != null) {
                mBottomActionBar.setActionClickListener(CUSTOMIZE, listener ->
                        startActivity(mSettingsIntent));
            } else {
                mBottomActionBar.hideActions(CUSTOMIZE);
            }
        }

        if (TextUtils.isEmpty(getDeleteAction(mWallpaper.getWallpaperComponent()))) {
            mBottomActionBar.hideActions(DELETE);
        } else {
            mBottomActionBar.setActionClickListener(DELETE, listener ->
                    showDeleteConfirmDialog());
        }
        mBottomActionBar.show();
        // Action buttons are disabled when live wallpaper is not loaded.
        mBottomActionBar.disableActions();
        // Enable buttons if loaded, or wait for it.
        if (isLoaded()) {
            mBottomActionBar.enableActions();
        }
    }

    @Override
    public void onEngineShown() {
        Activity activity = getActivity();
        if (activity == null) {
            return;
        }
        mWallpaperSurfaceCallback.getHomeImageWallpaper().animate()
                .setStartDelay(250)
                .setDuration(250)
                .alpha(0f)
                .setInterpolator(ALPHA_OUT)
                .start();

        if (mBottomActionBar != null) {
            mBottomActionBar.enableActions();
        }
    }

    @Override
    public void onWallpaperColorsChanged(WallpaperColors colors, int displayId) {
        mWallpaperColors = colors;
        mLockScreenPreviewer.setColor(colors);

        mFullScreenAnimation.setFullScreenTextColor(
                colors == null || (colors.getColorHints()
                        & WallpaperColors.HINT_SUPPORTS_DARK_TEXT) == 0
                            ? FullScreenAnimation.FullScreenTextColor.LIGHT
                            : FullScreenAnimation.FullScreenTextColor.DARK);
    }

    @Override
    protected boolean isLoaded() {
        return mWallpaperConnection != null && mWallpaperConnection.isEngineReady();
    }

    @SuppressLint("NewApi") //Already checking with isAtLeastQ
    protected Uri getSettingsSliceUri(android.app.WallpaperInfo info) {
        if (BuildCompat.isAtLeastQ()) {
            return info.getSettingsSliceUri();
        }
        return null;
    }

    @Override
    protected int getLayoutResId() {
        return R.layout.fragment_live_preview;
    }

    @Override
    protected void setCurrentWallpaper(int destination) {
        mWallpaperSetter.setCurrentWallpaper(getActivity(), mWallpaper, null,
                destination, 0, null, mWallpaperColors,
                SetWallpaperViewModel.getCallback(mViewModelProvider));
    }

    @Nullable
    protected String getDeleteAction(android.app.WallpaperInfo wallpaperInfo) {
        android.app.WallpaperInfo currentInfo =
                WallpaperManager.getInstance(requireContext()).getWallpaperInfo();
        ServiceInfo serviceInfo = wallpaperInfo.getServiceInfo();
        if (!isPackagePreInstalled(serviceInfo.applicationInfo)) {
            Log.d(TAG, "This wallpaper is not pre-installed: " + serviceInfo.name);
            return null;
        }

        ServiceInfo currentService = currentInfo == null ? null : currentInfo.getServiceInfo();
        // A currently set Live wallpaper should not be deleted.
        if (currentService != null && TextUtils.equals(serviceInfo.name, currentService.name)) {
            return null;
        }

        final Bundle metaData = serviceInfo.metaData;
        if (metaData != null) {
            return metaData.getString(KEY_ACTION_DELETE_LIVE_WALLPAPER);
        }
        return null;
    }

    @Override
    public void onStart() {
        super.onStart();
        previewLiveWallpaper(null);
    }

    @Override
    public void onResume() {
        super.onResume();
        if (mWallpaperConnection != null) {
            mWallpaperConnection.setVisibility(true);
        }
    }

    @Override
    public void onPause() {
        super.onPause();
        if (mWallpaperConnection != null) {
            mWallpaperConnection.setVisibility(false);
        }
    }

    @Override
    public void onStop() {
        super.onStop();
        if (mWallpaperConnection != null) {
            mWallpaperConnection.disconnect();
            mWallpaperConnection = null;
        }
    }

    private void showDeleteConfirmDialog() {
        final AlertDialog alertDialog = new AlertDialog.Builder(getContext())
                .setMessage(R.string.delete_wallpaper_confirmation)
                .setOnDismissListener(dialog -> mBottomActionBar.deselectAction(DELETE))
                .setPositiveButton(R.string.delete_live_wallpaper,
                        (dialog, which) -> deleteLiveWallpaper())
                .setNegativeButton(android.R.string.cancel, null /* listener */)
                .create();
        alertDialog.show();
    }

    private void deleteLiveWallpaper() {
        if (mDeleteIntent != null) {
            requireContext().startService(mDeleteIntent);
            finishActivity(/* success= */ false);
        }
    }

    private boolean isPackagePreInstalled(ApplicationInfo info) {
        return info != null && (info.flags & ApplicationInfo.FLAG_SYSTEM) != 0;
    }

    private final class PreviewCustomizeSettingsContent extends BottomSheetContent<View> {

        private PreviewCustomizeSettingsContent(Context context) {
            super(context);
        }

        @Override
        public int getViewId() {
            return R.layout.preview_customize_settings;
        }

        @Override
        public void onViewCreated(View previewPage) {
            mSettingsSliceView = previewPage.findViewById(R.id.settings_slice);
            mSettingsSliceView.setMode(SliceView.MODE_LARGE);
            mSettingsSliceView.setScrollable(false);
            if (mSettingsLiveData != null) {
                mSettingsLiveData.observeForever(mSettingsSliceView);
            }
        }

        @Override
        public void onRecreateView(View oldPreviewPage) {
            super.onRecreateView(oldPreviewPage);
            if (mSettingsLiveData != null && mSettingsLiveData.hasObservers()
                    && mSettingsSliceView != null) {
                mSettingsLiveData.removeObserver(mSettingsSliceView);
            }
        }
    }
}