refactor: database multi-period schedule storage

app/src/main/java/agzam/vyatsu/domain/model/Schedule.kt

@@ -1,17 +1,18 @@
 package agzam.vyatsu.domain.model
 
-/**
- * Расписание группы, как правило содержит 2 недели
- * @author Agzam
- */
+import java.time.LocalDate
+
+data class SchedulePeriod(
+    val weekStart: LocalDate,
+    val weekEnd: LocalDate,
+    val season: Season
+)
+
 data class Schedule(
-
     val groupId: String,
-    val season: Season,
-
-    /** Может содержать более 7 дней */
+    val periods: List<SchedulePeriod>,
     val days: List<Day>
-
 ) {
-
+    fun periodOf(date: LocalDate): SchedulePeriod? =
+        periods.firstOrNull { !date.isBefore(it.weekStart) && !date.isAfter(it.weekEnd) }
 }

app/src/main/java/agzam/vyatsu/domain/repository/ScheduleRepository.kt

@@ -1,6 +1,7 @@
 package agzam.vyatsu.domain.repository
 
 import agzam.vyatsu.domain.model.Schedule
+import agzam.vyatsu.domain.model.SchedulePeriod
 import kotlinx.coroutines.flow.Flow
 
 interface ScheduleRepository {
@@ -8,5 +9,6 @@ interface ScheduleRepository {
     suspend fun getSchedule(groupId: String): Schedule?
     suspend fun sync(groupId: String): Schedule?
     suspend fun isStale(groupId: String): Boolean
-    suspend fun clear(groupId: String)
+    suspend fun clearPeriod(groupId: String, period: SchedulePeriod)
+    suspend fun clearAll(groupId: String)
 }