/*
 * Copyright (C) 2017 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.launcher3.compat;

import android.annotation.TargetApi;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.LauncherActivityInfo;
import android.content.pm.LauncherApps;
import android.content.pm.LauncherApps.PinItemRequest;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Parcelable;
import android.os.Process;
import android.os.UserHandle;
import android.support.annotation.Nullable;

import com.android.launcher3.LauncherAppState;
import com.android.launcher3.LauncherModel;
import com.android.launcher3.ShortcutInfo;
import com.android.launcher3.compat.ShortcutConfigActivityInfo.ShortcutConfigActivityInfoVO;
import com.android.launcher3.graphics.LauncherIcons;
import com.android.launcher3.shortcuts.ShortcutInfoCompat;
import com.android.launcher3.util.LooperExecutor;
import com.android.launcher3.util.PackageUserKey;

import java.util.ArrayList;
import java.util.List;

@TargetApi(26)
public class LauncherAppsCompatVO extends LauncherAppsCompatVL {

    LauncherAppsCompatVO(Context context) {
        super(context);
    }

    @Override
    public ApplicationInfo getApplicationInfo(String packageName, int flags, UserHandle user) {
        try {
            ApplicationInfo info = mLauncherApps.getApplicationInfo(packageName, flags, user);
            return (info.flags & ApplicationInfo.FLAG_INSTALLED) == 0 || !info.enabled
                    ? null : info;
        } catch (PackageManager.NameNotFoundException e) {
            return null;
        }
    }

    @Override
    public List<ShortcutConfigActivityInfo> getCustomShortcutActivityList(
            @Nullable PackageUserKey packageUser) {
        List<ShortcutConfigActivityInfo> result = new ArrayList<>();
        UserHandle myUser = Process.myUserHandle();

        final List<UserHandle> users;
        final String packageName;
        if (packageUser == null) {
            users = UserManagerCompat.getInstance(mContext).getUserProfiles();
            packageName = null;
        } else {
            users = new ArrayList<>(1);
            users.add(packageUser.mUser);
            packageName = packageUser.mPackageName;
        }
        for (UserHandle user : users) {
            boolean ignoreTargetSdk = myUser.equals(user);
            List<LauncherActivityInfo> activities =
                    mLauncherApps.getShortcutConfigActivityList(packageName, user);
            for (LauncherActivityInfo activityInfo : activities) {
                if (ignoreTargetSdk || activityInfo.getApplicationInfo().targetSdkVersion >=
                        Build.VERSION_CODES.O) {
                    result.add(new ShortcutConfigActivityInfoVO(activityInfo));
                }
            }
        }

        return result;
    }

    /**
     * request.accept() will initiate the following flow:
     *      -> go-to-system-process for actual processing (a)
     *      -> callback-to-launcher on UI thread (b)
     *      -> post callback on the worker thread (c)
     *      -> Update model and unpin (in system) any shortcut not in out model. (d)
     *
     * Note that (b) will take at-least one frame as it involves posting callback from binder
     * thread to UI thread.
     * If (d) happens before we add this shortcut to our model, we will end up unpinning
     * the shortcut in the system.
     * Here its the caller's responsibility to add the newly created ShortcutInfo immediately
     * to the model (which may involves a single post-to-worker-thread). That will guarantee
     * that (d) happens after model is updated.
     */
    @Nullable
    public static ShortcutInfo createShortcutInfoFromPinItemRequest(
            Context context, final PinItemRequest request, final long acceptDelay) {
        if (request != null &&
                request.getRequestType() == PinItemRequest.REQUEST_TYPE_SHORTCUT &&
                request.isValid()) {

            if (acceptDelay <= 0) {
                if (!request.accept()) {
                    return null;
                }
            } else {
                // Block the worker thread until the accept() is called.
                new LooperExecutor(LauncherModel.getWorkerLooper()).execute(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            Thread.sleep(acceptDelay);
                        } catch (InterruptedException e) {
                            // Ignore
                        }
                        if (request.isValid()) {
                            request.accept();
                        }
                    }
                });
            }

            ShortcutInfoCompat compat = new ShortcutInfoCompat(request.getShortcutInfo());
            ShortcutInfo info = new ShortcutInfo(compat, context);
            // Apply the unbadged icon and fetch the actual icon asynchronously.
            info.iconBitmap = LauncherIcons
                    .createShortcutIcon(compat, context, false /* badged */);
            LauncherAppState.getInstance(context).getModel()
                    .updateAndBindShortcutInfo(info, compat);
            return info;
        } else {
            return null;
        }
    }

    public static PinItemRequest getPinItemRequest(Intent intent) {
        Parcelable extra = intent.getParcelableExtra(LauncherApps.EXTRA_PIN_ITEM_REQUEST);
        return extra instanceof PinItemRequest ? (PinItemRequest) extra : null;
    }
}