1 files changed, 78 insertions, 0 deletions
diff --git a/app/src/main/java/foundation/e/advancedprivacy/domain/usecases/TrackersAndAppsListsUseCase.kt b/app/src/main/java/foundation/e/advancedprivacy/domain/usecases/TrackersAndAppsListsUseCase.kt
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+++ b/app/src/main/java/foundation/e/advancedprivacy/domain/usecases/TrackersAndAppsListsUseCase.kt
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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.domain.usecases
+
+import foundation.e.advancedprivacy.data.repositories.AppListsRepository
+import foundation.e.advancedprivacy.domain.entities.ApplicationDescription
+import foundation.e.advancedprivacy.features.trackers.AppWithTrackersCount
+import foundation.e.advancedprivacy.features.trackers.TrackerWithAppsCount
+import foundation.e.advancedprivacy.trackers.data.StatsDatabase
+import foundation.e.advancedprivacy.trackers.data.TrackersRepository
+import foundation.e.advancedprivacy.trackers.domain.entities.Tracker
+import kotlinx.coroutines.flow.first
+
+class TrackersAndAppsListsUseCase(
+    private val statsDatabase: StatsDatabase,
+    private val trackersRepository: TrackersRepository,
+    private val appListsRepository: AppListsRepository,
+) {
+
+    suspend fun getAppsAndTrackersCounts(): Pair<List<AppWithTrackersCount>, List<TrackerWithAppsCount>> {
+        val trackersAndAppsIds = statsDatabase.getDistinctTrackerAndApp()
+        val trackersAndApps = mapIdsToEntities(trackersAndAppsIds)
+        val (countByApp, countByTracker) = foldToCountByEntityMaps(trackersAndApps)
+
+        val appList = buildAppList(countByApp)
+        val trackerList = buildTrackerList(countByTracker)
+        return appList to trackerList
+    }
+
+    private fun buildTrackerList(countByTracker: Map<Tracker, Int>): List<TrackerWithAppsCount> {
+        return countByTracker.map { (tracker, count) ->
+            TrackerWithAppsCount(tracker = tracker, appsCount = count)
+        }.sortedByDescending { it.appsCount }
+    }
+
+    private suspend fun buildAppList(countByApp: Map<ApplicationDescription, Int>): List<AppWithTrackersCount> {
+        return appListsRepository.apps().first().map { app: ApplicationDescription ->
+            AppWithTrackersCount(app = app, trackersCount = countByApp[app] ?: 0)
+        }.sortedByDescending { it.trackersCount }
+    }
+
+    private suspend fun mapIdsToEntities(trackersAndAppsIds: List<Pair<String, String>>): List<Pair<Tracker, ApplicationDescription>> {
+        return trackersAndAppsIds.mapNotNull { (trackerId, apId) ->
+            trackersRepository.getTracker(trackerId)?.let { tracker ->
+                appListsRepository.getDisplayableApp(apId)?.let { app ->
+                    tracker to app
+                }
+            }
+            // appListsRepository.getDisplayableApp() may transform many apId to one
+            // ApplicationDescription, so the lists is not distinct anymore.
+        }.distinct()
+    }
+
+    private fun foldToCountByEntityMaps(trackersAndApps: List<Pair<Tracker, ApplicationDescription>>):
+        Pair<Map<ApplicationDescription, Int>, Map<Tracker, Int>> {
+            return trackersAndApps.fold(
+                mutableMapOf<ApplicationDescription, Int>() to mutableMapOf<Tracker, Int>()
+            ) { (countByApp, countByTracker), (tracker, app) ->
+                countByApp[app] = countByApp.getOrDefault(app, 0) + 1
+                countByTracker[tracker] = countByTracker.getOrDefault(tracker, 0) + 1
+                countByApp to countByTracker
+            }
+        }
+}