/*
 * Copyright (C) 2022 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.systemui.user.domain.interactor

import android.os.UserHandle
import android.os.UserManager
import com.android.systemui.user.data.repository.UserRepository

/** Utilities related to user management actions. */
object UserActionsUtil {

    /**
     * Returns `true` if it's possible for the given user to add a guest user to the device; `false`
     * otherwise.
     */
    fun canCreateGuest(
        manager: UserManager,
        repository: UserRepository,
        isUserSwitcherEnabled: Boolean,
        canAddUsersWhenLockedOrDeviceUnlocked: Boolean,
    ): Boolean {
        return canAddMoreUsers(
            manager,
            repository,
            isUserSwitcherEnabled,
            canAddUsersWhenLockedOrDeviceUnlocked,
            UserManager.USER_TYPE_FULL_GUEST
        )
    }

    /**
     * Returns `true` if it's possible for the given user to add a user to the device; `false`
     * otherwise.
     */
    fun canCreateUser(
        manager: UserManager,
        repository: UserRepository,
        isUserSwitcherEnabled: Boolean,
        canAddUsersWhenLockedOrDeviceUnlocked: Boolean,
    ): Boolean {
        return canAddMoreUsers(
            manager,
            repository,
            isUserSwitcherEnabled,
            canAddUsersWhenLockedOrDeviceUnlocked,
            UserManager.USER_TYPE_FULL_SECONDARY
        )
    }

    /**
     * Returns `true` if it's possible to add a supervised user to the device given the current
     * user; false` otherwise.
     */
    fun canCreateSupervisedUser(
        manager: UserManager,
        repository: UserRepository,
        isUserSwitcherEnabled: Boolean,
        canAddUsersWhenLockedOrDeviceUnlocked: Boolean,
        supervisedUserPackageName: String?
    ): Boolean {
        if (supervisedUserPackageName.isNullOrEmpty()) {
            return false
        }

        return canCreateUser(
            manager,
            repository,
            isUserSwitcherEnabled,
            canAddUsersWhenLockedOrDeviceUnlocked
        )
    }

    fun canManageUsers(repository: UserRepository, isUserSwitcherEnabled: Boolean): Boolean {
        return isUserSwitcherEnabled && repository.getSelectedUserInfo().isAdmin
    }

    /**
     * Returns `true` if it's possible to add a user to the device for the given user type; false
     * otherwise.
     */
    private fun canAddMoreUsers(
        manager: UserManager,
        repository: UserRepository,
        isUserSwitcherEnabled: Boolean,
        canAddUsersWhenLockedOrDeviceUnlocked: Boolean,
        userType: String
    ): Boolean {
        if (!isUserSwitcherEnabled || !canAddUsersWhenLockedOrDeviceUnlocked) {
            return false
        }

        return currentUserCanCreateUsers(manager, repository) && manager.canAddMoreUsers(userType)
    }

    /**
     * Returns `true` if the current user is allowed to add users to the device; `false` otherwise.
     */
    private fun currentUserCanCreateUsers(
        manager: UserManager,
        repository: UserRepository
    ): Boolean {
        val currentUser = repository.getSelectedUserInfo()
        if (!currentUser.isAdmin && currentUser.id != UserHandle.USER_SYSTEM) {
            return false
        }
        return !manager.hasUserRestrictionForUser(
            UserManager.DISALLOW_ADD_USER,
            UserHandle.of(currentUser.id)
        ) && !manager.hasUserRestrictionForUser(UserManager.DISALLOW_ADD_USER, UserHandle.SYSTEM)
    }
}