/*
 * Copyright (C) 2020 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.permissioncontroller.permission.data

import android.app.Application
import android.content.ComponentName
import android.os.UserHandle
import android.provider.Settings
import com.android.permissioncontroller.PermissionControllerApplication
import com.android.permissioncontroller.permission.utils.Utils
import kotlinx.coroutines.Job

/**
 * A LiveData which tracks disabled print service packages
 *
 * @param app The current application
 * @param user The user the services should be determined for
 */
class DisabledPrintServicesLiveData(
    private val app: Application,
    private val user: UserHandle
) : SmartAsyncMediatorLiveData<List<String>>() {

    override suspend fun loadDataAndPostValue(job: Job) {
        if (job.isCancelled) {
            return
        }

        val packageNames = Settings.Secure.getString(
                Utils.getUserContext(app, user).contentResolver, SETTING)
                ?.split(":")
                ?.map { pkgOrComponent ->
                    if ('/' in pkgOrComponent) {
                        ComponentName.unflattenFromString(pkgOrComponent)
                                ?.packageName
                                ?: pkgOrComponent
                    } else {
                        pkgOrComponent
                    }
                } ?: emptyList()

        postValue(packageNames)
    }

    /**
     * Repository for [DisabledPrintServicesLiveData]
     *
     * <p> Key value is a user, value is its corresponding LiveData.
     */
    companion object : DataRepositoryForPackage<UserHandle,
            DisabledPrintServicesLiveData>() {
        /* Settings.Secure.DISABLED_PRINT_SERVICES */
        private const val SETTING = "disabled_print_services"

        override fun newValue(key: UserHandle): DisabledPrintServicesLiveData {
            return DisabledPrintServicesLiveData(PermissionControllerApplication.get(), key)
        }
    }
}