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/*
* Copyright (C) 2023 MURENA SAS
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package foundation.e.advancedprivacy.trackers.service.usecases
import foundation.e.advancedprivacy.domain.entities.FeatureState
import foundation.e.advancedprivacy.domain.entities.MainFeatures
import foundation.e.advancedprivacy.domain.entities.MainFeatures.IpScrambling
import foundation.e.advancedprivacy.domain.entities.MainFeatures.TrackersControl
import foundation.e.advancedprivacy.domain.repositories.LocalStateRepository
import foundation.e.advancedprivacy.domain.usecases.VpnSupervisorUseCase
import foundation.e.advancedprivacy.externalinterfaces.servicesupervisors.FeatureSupervisor
import foundation.e.advancedprivacy.ipscrambler.OrbotSupervisor
import foundation.e.advancedprivacy.trackers.domain.externalinterfaces.TrackersSupervisor
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.combine
import kotlinx.coroutines.flow.first
import kotlinx.coroutines.flow.launchIn
import kotlinx.coroutines.launch
class VpnSupervisorUseCaseStandalone(
private val localStateRepository: LocalStateRepository,
private val trackersSupervisor: TrackersSupervisor,
private val orbotSupervisor: OrbotSupervisor,
private val scope: CoroutineScope,
) : VpnSupervisorUseCase {
private var applySettingJob: Job? = null
init {
listenSettings()
}
override fun listenSettings() {
var previousBlockTrackers: Boolean? = null
localStateRepository.blockTrackers.combine(
localStateRepository.ipScramblingSetting
) { blockTrackers, hideIp ->
applySettingJob?.cancel()
applySettingJob = scope.launch {
when {
blockTrackers && !hideIp ->
launchVpnService(trackersSupervisor)
!blockTrackers && !hideIp ->
stopAllServices()
else -> {
if (blockTrackers && previousBlockTrackers != true) {
localStateRepository.emitStartVpnDisclaimer(IpScrambling())
}
launchVpnService(orbotSupervisor)
}
}
previousBlockTrackers = blockTrackers
}
}.launchIn(scope)
}
private fun stopAllServices() {
listOf(orbotSupervisor, trackersSupervisor).map { stopVpnService(it) }
}
private fun stopVpnService(supervisor: FeatureSupervisor): FeatureSupervisor {
when (supervisor.state.value) {
FeatureState.ON,
FeatureState.STARTING ->
supervisor.stop()
else -> {}
}
return supervisor
}
private suspend fun launchVpnService(supervisor: FeatureSupervisor) {
stopVpnService(otherSupervisor(supervisor)).let { otherSupervisor ->
otherSupervisor.state.first { it == FeatureState.OFF }
}
when (supervisor.state.value) {
FeatureState.STOPPING -> {
supervisor.state.first { it == FeatureState.OFF }
initiateStartVpnService(supervisor)
}
FeatureState.OFF -> initiateStartVpnService(supervisor)
else -> {}
}
}
private fun otherSupervisor(supervisor: FeatureSupervisor): FeatureSupervisor {
return when (supervisor) {
trackersSupervisor -> orbotSupervisor
else -> trackersSupervisor
}
}
private fun getSupervisor(feature: MainFeatures): FeatureSupervisor {
return when (feature) {
is TrackersControl -> trackersSupervisor
else -> orbotSupervisor
}
}
private suspend fun initiateStartVpnService(supervisor: FeatureSupervisor) {
val authorizeVpnIntent = orbotSupervisor.prepareAndroidVpn()
val feature = when (supervisor) {
trackersSupervisor -> TrackersControl(authorizeVpnIntent)
else -> IpScrambling(authorizeVpnIntent)
}
if (authorizeVpnIntent == null) {
localStateRepository.emitStartVpnDisclaimer(feature)
startVpnService(feature)
} else {
localStateRepository.emitStartVpnDisclaimer(feature)
}
}
override fun startVpnService(feature: MainFeatures) {
if (feature is IpScrambling) {
localStateRepository.internetPrivacyMode.value = FeatureState.STARTING
orbotSupervisor.setDNSFilter(trackersSupervisor.dnsFilterForIpScrambling)
}
getSupervisor(feature).start()
}
override fun cancelStartVpnService(feature: MainFeatures) {
when (feature) {
is IpScrambling ->
localStateRepository.setIpScramblingSetting(enabled = false)
is TrackersControl ->
trackersSupervisor.stop()
else -> {}
}
}
}
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