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/*
* Copyright (C) 2023 MURENA SAS
* Copyright (C) 2021 E FOUNDATION
*
* 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.features.trackers.apptrackers
import android.net.Uri
import androidx.annotation.StringRes
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import foundation.e.advancedprivacy.domain.entities.ApplicationDescription
import foundation.e.advancedprivacy.domain.entities.TrackerMode
import foundation.e.advancedprivacy.domain.usecases.AppTrackersUseCase
import foundation.e.advancedprivacy.domain.usecases.GetQuickPrivacyStateUseCase
import foundation.e.advancedprivacy.domain.usecases.TrackersStateUseCase
import foundation.e.advancedprivacy.domain.usecases.TrackersStatisticsUseCase
import foundation.e.advancedprivacy.features.trackers.URL_LEARN_MORE_ABOUT_TRACKERS
import foundation.e.advancedprivacy.trackers.domain.entities.Tracker
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.flow.MutableSharedFlow
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.asSharedFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.flow.map
import kotlinx.coroutines.flow.merge
import kotlinx.coroutines.flow.update
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext
class AppTrackersViewModel(
private val app: ApplicationDescription,
private val appTrackersUseCase: AppTrackersUseCase,
private val trackersStateUseCase: TrackersStateUseCase,
private val trackersStatisticsUseCase: TrackersStatisticsUseCase,
private val getQuickPrivacyStateUseCase: GetQuickPrivacyStateUseCase
) : ViewModel() {
companion object {
private const val exodusBaseUrl = "https://reports.exodus-privacy.eu.org/trackers/"
}
private val _state = MutableStateFlow(AppTrackersState())
val state = _state.asStateFlow()
private val _singleEvents = MutableSharedFlow<SingleEvent>()
val singleEvents = _singleEvents.asSharedFlow()
init {
_state.update {
it.copy(
appDesc = app,
)
}
}
suspend fun doOnStartedState() = withContext(Dispatchers.IO) {
merge(
getQuickPrivacyStateUseCase.trackerMode.map {
_state.update { s -> s.copy(isTrackersBlockingEnabled = it != TrackerMode.VULNERABLE) }
},
trackersStatisticsUseCase.listenUpdates().map { fetchStatistics() }
).collect { }
}
fun onClickLearnMore() {
viewModelScope.launch {
_singleEvents.emit(SingleEvent.OpenUrl(Uri.parse(URL_LEARN_MORE_ABOUT_TRACKERS)))
}
}
fun onToggleBlockAll(isBlocked: Boolean) {
viewModelScope.launch(Dispatchers.IO) {
if (!state.value.isTrackersBlockingEnabled) {
_singleEvents.emit(SingleEvent.ToastTrackersControlDisabled)
}
appTrackersUseCase.toggleAppWhitelist(app, isBlocked)
updateWhitelist()
}
}
fun onToggleTracker(tracker: Tracker, isBlocked: Boolean) {
viewModelScope.launch(Dispatchers.IO) {
if (!state.value.isTrackersBlockingEnabled) {
_singleEvents.emit(SingleEvent.ToastTrackersControlDisabled)
}
trackersStateUseCase.blockTracker(app, tracker, isBlocked)
updateWhitelist()
}
}
fun onClickTracker(tracker: Tracker) {
viewModelScope.launch(Dispatchers.IO) {
tracker.exodusId?.let {
runCatching { Uri.parse(exodusBaseUrl + it) }.getOrNull()
}?.let { _singleEvents.emit(SingleEvent.OpenUrl(it)) }
}
}
fun onClickResetAllTrackers() {
viewModelScope.launch(Dispatchers.IO) {
appTrackersUseCase.clearWhitelist(app)
updateWhitelist()
}
}
private suspend fun fetchStatistics() = withContext(Dispatchers.IO) {
val (blocked, leaked) = appTrackersUseCase.getCalls(app)
val trackersWithBlockedList = appTrackersUseCase.getTrackersWithBlockedList(app)
_state.update { s ->
s.copy(
leaked = leaked,
blocked = blocked,
isBlockingActivated = !trackersStateUseCase.isWhitelisted(app),
isWhitelistEmpty = trackersStatisticsUseCase.isWhiteListEmpty(app),
trackersWithBlockedList = trackersWithBlockedList
)
}
}
private suspend fun updateWhitelist() = withContext(Dispatchers.IO) {
_state.update { s ->
s.copy(
isBlockingActivated = !trackersStateUseCase.isWhitelisted(app),
trackersWithBlockedList = appTrackersUseCase.enrichWithBlockedState(
app, s.trackersWithBlockedList.map { it.first }
),
isWhitelistEmpty = trackersStatisticsUseCase.isWhiteListEmpty(app),
)
}
}
sealed class SingleEvent {
data class ErrorEvent(@StringRes val errorResId: Int) : SingleEvent()
data class OpenUrl(val url: Uri) : SingleEvent()
object ToastTrackersControlDisabled : SingleEvent()
}
}
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