/*
 * Copyright (C) 2021 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.role.controller.util;

import android.content.Context;
import android.os.Build;
import android.os.Process;
import android.os.UserHandle;
import android.os.UserManager;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import com.android.modules.utils.build.SdkLevel;

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

/** Utility class to deal with Android users. */
public final class UserUtils {

    private UserUtils() {}

    /**
     * Check whether a user is a profile.
     *
     * @param user    the user to check
     * @param context the {@code Context} to retrieve system services
     * @return whether the user is a profile
     */
    public static boolean isProfile(@NonNull UserHandle user, @NonNull Context context) {
        if (SdkLevel.isAtLeastV()) {
            Context userContext = getUserContext(context, user);
            UserManager userUserManager = userContext.getSystemService(UserManager.class);
            return userUserManager.isProfile();
        } else {
            return isManagedProfile(user, context) || isCloneProfile(user, context);
        }
    }

    /**
     * Check whether a user is a managed profile.
     *
     * @param user    the user to check
     * @param context the {@code Context} to retrieve system services
     * @return whether the user is a managed profile
     */
    public static boolean isManagedProfile(@NonNull UserHandle user, @NonNull Context context) {
        Context userContext = getUserContext(context, user);
        UserManager userUserManager = userContext.getSystemService(UserManager.class);
        return userUserManager.isManagedProfile(user.getIdentifier());
    }

    /**
     * Check whether a user is a clone profile.
     *
     * @param user    the user to check
     * @param context the {@code Context} to retrieve system services
     * @return whether the user is a clone profile
     */
    public static boolean isCloneProfile(@NonNull UserHandle user, @NonNull Context context) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.S) {
            return false;
        }
        Context userContext = getUserContext(context, user);
        UserManager userUserManager = userContext.getSystemService(UserManager.class);
        return userUserManager.isCloneProfile();
    }

    /**
     * Check whether a user is a private profile.
     *
     * @param user    the user to check
     * @param context the {@code Context} to retrieve system services
     * @return whether the user is a private profile. Private profiles are
     * allowed from Android V+ only, so this method will return false on Sdk levels below that.
     */
    public static boolean isPrivateProfile(@NonNull UserHandle user, @NonNull Context context) {
        if (!SdkLevel.isAtLeastV()) {
            return false;
        }
        Context userContext = getUserContext(context, user);
        UserManager userUserManager = userContext.getSystemService(UserManager.class);
        return userUserManager.isPrivateProfile();
    }

    /**
     * Create a context for a user.
     *
     * @param context The context to clone
     * @param user The user the new context should be for
     *
     * @return The context for the new user
     */
    @NonNull
    public static Context getUserContext(@NonNull Context context, @NonNull UserHandle user) {
        if (Process.myUserHandle().equals(user)) {
            return context;
        } else {
            return context.createContextAsUser(user, 0);
        }
    }

    /**
     * Returns the parent of a given user, or user if it has no parent (e.g. it is the primary
     * user)
     */
    @NonNull
    public static UserHandle getProfileParentOrSelf(@NonNull UserHandle user,
            @NonNull Context context) {
        UserHandle profileParent = getProfileParent(user, context);
        // If profile parent user is null, then original user is the parent
        return profileParent != null ? profileParent : user;
    }

    /** Returns the parent of a given user. */
    @Nullable
    public static UserHandle getProfileParent(UserHandle user, @NonNull Context context) {
        Context userContext = getUserContext(context, user);
        UserManager userManager = userContext.getSystemService(UserManager.class);
        return userManager.getProfileParent(user);
    }

    /**
     * Returns all the enabled user profiles on the device
     *
     * @param user the {@link UserHandle} to get profiles for
     * @param context the {@link Context}
     * @param excludePrivate {@code true} to exclude private profiles from returned list of users
     */
    @NonNull
    public static List<UserHandle> getUserProfiles(@NonNull UserHandle user,
            @NonNull Context context, boolean excludePrivate) {
        Context userContext = getUserContext(context, user);
        UserManager userUserManager = userContext.getSystemService(UserManager.class);
        List<UserHandle> profiles = userUserManager.getUserProfiles();
        if (!excludePrivate) {
            return profiles;
        }
        List<UserHandle> filteredProfiles = new ArrayList<>();
        final int profilesSize = profiles.size();
        for (int i = 0; i < profilesSize; i++) {
            UserHandle profile = profiles.get(i);
            if (!isPrivateProfile(profile, userContext)) {
                filteredProfiles.add(profile);
            }
        }
        return filteredProfiles;
    }
}