#76 added sessionDAO

app/src/main/java/be/ugent/sel/studeez/domain/SessionDAO.kt

@@ -0,0 +1,4 @@
+package be.ugent.sel.studeez.domain
+
+interface SessionDAO {
+}

app/src/main/java/be/ugent/sel/studeez/domain/implementation/FireBaseSessionDAO.kt

@@ -0,0 +1,43 @@
+package be.ugent.sel.studeez.domain.implementation
+
+import be.ugent.sel.studeez.data.local.models.SessionReport
+import be.ugent.sel.studeez.data.local.models.timer_info.TimerInfo
+import be.ugent.sel.studeez.domain.AccountDAO
+import be.ugent.sel.studeez.domain.SessionDAO
+import com.google.firebase.firestore.CollectionReference
+import com.google.firebase.firestore.FirebaseFirestore
+import com.google.firebase.firestore.ktx.snapshots
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
+import javax.inject.Inject
+
+class FireBaseSessionDAO @Inject constructor(
+    private val firestore: FirebaseFirestore,
+    private val auth: AccountDAO
+) : SessionDAO {
+
+    override fun getSessions(): Flow<List<SessionReport>> {
+        return currentUserSessionsCollection()
+            .snapshots()
+            .map { it.toObjects(SessionReport::class.java) }
+    }
+
+    override fun saveSession(newSessionReport: SessionReport) {
+        currentUserSessionsCollection().add(newSessionReport)
+    }
+
+    override fun deleteSession(newTimer: TimerInfo) {
+        currentUserSessionsCollection().document(newTimer.id).delete()
+    }
+
+    private fun currentUserSessionsCollection(): CollectionReference =
+        firestore.collection(USER_COLLECTION)
+            .document(auth.currentUserId)
+            .collection(SESSION_COLLECTION)
+
+    companion object {
+        private const val SESSION_COLLECTION = "sessions"
+        private const val USER_COLLECTION = "users"
+    }
+
+}