/*
 * Copyright (C) 2023 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.healthconnect.controller.shared.app

import android.content.Context
import android.content.pm.ApplicationInfo
import android.content.pm.PackageManager
import android.content.pm.PackageManager.ApplicationInfoFlags
import dagger.hilt.android.qualifiers.ApplicationContext
import javax.inject.Inject
import javax.inject.Singleton

@Singleton
class AppInfoReader
@Inject
constructor(
    @ApplicationContext private val context: Context,
    private val applicationsInfoUseCase: GetContributorAppInfoUseCase
) {

    private var cache: HashMap<String, AppMetadata> = HashMap()
    private val packageManager = context.packageManager

    suspend fun getAppMetadata(packageName: String): AppMetadata {
        if (cache.containsKey(packageName)) {
            return cache[packageName]!!
        } else if (isAppInstalled(packageName)) {
            val app =
                AppMetadata(
                    packageName = packageName,
                    appName =
                        packageManager.getApplicationLabel(getPackageInfo(packageName)).toString(),
                    icon = packageManager.getApplicationIcon(packageName))
            cache[packageName] = app
            return app
        } else {
            val contributorApps = applicationsInfoUseCase.invoke()
            cache.putAll(contributorApps)
            return if (contributorApps.containsKey(packageName)) {
                contributorApps[packageName]!!
            } else {
                AppMetadata(packageName = packageName, appName = "", icon = null)
            }
        }
    }

    fun isAppInstalled(packageName: String): Boolean {
        return try {
            getPackageInfo(packageName).enabled
        } catch (e: PackageManager.NameNotFoundException) {
            false
        }
    }

    private fun getPackageInfo(packageName: String): ApplicationInfo {
        return packageManager.getApplicationInfo(packageName, ApplicationInfoFlags.of(0))
    }
}