/*
 * Copyright (C) 2014 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.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.LauncherActivityInfo;
import android.graphics.Rect;
import android.os.Bundle;
import android.os.UserHandle;
import android.support.annotation.Nullable;

import com.android.launcher3.LauncherAppState;
import com.android.launcher3.ShortcutInfo;
import com.android.launcher3.Utilities;
import com.android.launcher3.graphics.LauncherIcons;
import com.android.launcher3.shortcuts.ShortcutInfoCompat;

import java.util.List;

public abstract class LauncherAppsCompat {

    public interface OnAppsChangedCallbackCompat {
        void onPackageRemoved(String packageName, UserHandle user);
        void onPackageAdded(String packageName, UserHandle user);
        void onPackageChanged(String packageName, UserHandle user);
        void onPackagesAvailable(String[] packageNames, UserHandle user, boolean replacing);
        void onPackagesUnavailable(String[] packageNames, UserHandle user, boolean replacing);
        void onPackagesSuspended(String[] packageNames, UserHandle user);
        void onPackagesUnsuspended(String[] packageNames, UserHandle user);
        void onShortcutsChanged(String packageName, List<ShortcutInfoCompat> shortcuts,
                UserHandle user);
    }

    protected LauncherAppsCompat() {
    }

    private static LauncherAppsCompat sInstance;
    private static Object sInstanceLock = new Object();

    public static LauncherAppsCompat getInstance(Context context) {
        synchronized (sInstanceLock) {
            if (sInstance == null) {
                if (Utilities.isAtLeastO()) {
                    sInstance = new LauncherAppsCompatVO(context.getApplicationContext());
                } else {
                    sInstance = new LauncherAppsCompatVL(context.getApplicationContext());
                }
            }
            return sInstance;
        }
    }

    public abstract List<LauncherActivityInfo> getActivityList(String packageName,
            UserHandle user);
    public abstract LauncherActivityInfo resolveActivity(Intent intent,
            UserHandle user);
    public abstract void startActivityForProfile(ComponentName component, UserHandle user,
            Rect sourceBounds, Bundle opts);
    public abstract ApplicationInfo getApplicationInfo(
            String packageName, int flags, UserHandle user);
    public abstract void showAppDetailsForProfile(ComponentName component, UserHandle user);
    public abstract void addOnAppsChangedCallback(OnAppsChangedCallbackCompat listener);
    public abstract void removeOnAppsChangedCallback(OnAppsChangedCallbackCompat listener);
    public abstract boolean isPackageEnabledForProfile(String packageName, UserHandle user);
    public abstract boolean isActivityEnabledForProfile(ComponentName component,
            UserHandle user);
    public abstract List<ShortcutConfigActivityInfo> getCustomShortcutActivityList();

    /**
     * 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, PinItemRequestCompat request) {
        if (request != null &&
                request.getRequestType() == PinItemRequestCompat.REQUEST_TYPE_SHORTCUT &&
                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;
        }
    }
}