fix: ssl error & offline teacher schedule

app/src/main/AndroidManifest.xml

@@ -12,6 +12,7 @@
         android:fullBackupContent="@xml/backup_rules"
         android:icon="@drawable/icon"
         android:label="@string/app_name"
+        android:networkSecurityConfig="@xml/network_security_config"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.VyatsuSchedule">

app/src/main/java/agzam/vyatsu/data/local/TeacherScheduleDao.kt

@@ -33,6 +33,9 @@ interface TeacherScheduleDao {
     @Query("DELETE FROM teacher_schedules")
     suspend fun deleteAll()
 
+    @Query("SELECT lastSyncedAt FROM teacher_schedules WHERE departmentId = :departmentId AND season = :season AND weekStart = :weekStart")
+    suspend fun lastSyncedAt(departmentId: String, season: String, weekStart: Long): Long?
+
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     suspend fun insertDays(days: List<TeacherDayEntity>): List<Long>
 
@@ -41,6 +44,7 @@ interface TeacherScheduleDao {
 
     @Transaction
     suspend fun replaceSchedule(schedule: TeacherScheduleEntity, days: List<TeacherDayEntity>, lessons: List<TeacherLessonEntity>) {
+        deleteSchedule(schedule.departmentId, schedule.season.name, schedule.weekStart)
         val scheduleId = insertSchedule(schedule)
         val daysWithScheduleId = days.map { it.copy(scheduleId = scheduleId) }
         deleteDaysForSchedule(scheduleId)

app/src/main/java/agzam/vyatsu/data/repository/TeacherScheduleRepositoryImpl.kt

@@ -56,7 +56,7 @@ class TeacherScheduleRepositoryImpl(
         scheduleDao.observeDistinctTeachers(period.season.name, period.weekStart.toEpochDay())
             .map { names -> names.map { name -> Teacher(name = name) } }
 
-    override suspend fun syncPeriod(date: LocalDate): Flow<BulkSyncProgress> = flow {
+    override suspend fun syncPeriod(date: LocalDate, force: Boolean): Flow<BulkSyncProgress> = flow {
         // Unique index (departmentId, season, weekStart) breaks on interleaved
         // delete+insert from concurrent syncPeriod() callers.
         syncMutex.withLock {
@@ -68,18 +68,27 @@ class TeacherScheduleRepositoryImpl(
                 return@withLock
             }
 
-            targets.map { it.season to it.weekStart }
-                .distinct()
-                .forEach { (season, weekStart) ->
-                    withContext(Dispatchers.IO) {
-                        scheduleDao.deletePeriod(season.name, weekStart)
+            val now = now()
+            var skippedCount = 0
+            val nonSkipped = mutableListOf<DepartmentPeriodEntity>()
+            for (target in targets) {
+                val last = withContext(Dispatchers.IO) {
+                    scheduleDao.lastSyncedAt(target.departmentId, target.season.name, target.weekStart)
+                }
+                val shouldSkip = !force && last != null && now - last < STALE_WINDOW_MS
+                if (shouldSkip) {
+                    skippedCount++
+                } else {
+                    nonSkipped.add(target)
                 }
             }
 
+            emit(BulkSyncProgress(total = targets.size, done = skippedCount, failed = 0))
+
             val total = targets.size
             val semaphore = Semaphore(PARALLELISM)
             val jobs = coroutineScope {
-                targets.map { target ->
+                nonSkipped.map { target ->
                     async {
                         semaphore.withPermit {
                             try {
@@ -102,7 +111,7 @@ class TeacherScheduleRepositoryImpl(
                 }
             }
 
-            var done = 0
+            var done = skippedCount
             var failed = 0
             for (job in jobs) {
                 if (job.await()) done++ else failed++

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

@@ -10,7 +10,7 @@ import java.time.LocalDate
 interface TeacherScheduleRepository {
     fun observeTeachers(period: SchedulePeriod): Flow<List<Teacher>>
     fun observeSchedule(period: SchedulePeriod): Flow<TeacherSchedule?>
-    suspend fun syncPeriod(date: LocalDate): Flow<BulkSyncProgress>
+    suspend fun syncPeriod(date: LocalDate, force: Boolean = false): Flow<BulkSyncProgress>
     suspend fun hasData(period: SchedulePeriod): Boolean
     suspend fun weeksFor(date: LocalDate): List<SchedulePeriod>
     suspend fun clearAll()

app/src/main/java/agzam/vyatsu/ui/picker/PickerViewModel.kt

@@ -146,7 +146,15 @@ class PickerViewModel(
         syncJob = viewModelScope.launch {
             try {
                 teacherScheduleRepository.syncPeriod(today).collect { progress ->
-                    _uiState.value = _uiState.value.copy(syncProgress = progress)
+                    _uiState.value = _uiState.value.copy(
+                        syncProgress = progress,
+                        error = if (progress.failed > 0) {
+                            "Не удалось загрузить расписание: ${progress.failed} из " +
+                                "${progress.total} кафедр. Проверьте подключение к интернету."
+                        } else {
+                            _uiState.value.error
+                        }
+                    )
                 }
             } catch (e: CancellationException) {
                 throw e

app/src/main/java/agzam/vyatsu/ui/teacher/TeacherScheduleViewModel.kt

@@ -89,7 +89,9 @@ class TeacherScheduleViewModel(
         if (!scheduleRepository.hasData(period)) {
             _uiState.value = _uiState.value.copy(isLoading = true, loadError = false)
             try {
-                scheduleRepository.syncPeriod(period.weekStart).collect { }
+                // force = true: hasData() already proved there is nothing cached for
+                // this period, so never let the staleness window skip the fetch.
+                scheduleRepository.syncPeriod(period.weekStart, force = true).collect { }
             } catch (e: CancellationException) {
                 throw e
             } catch (e: Exception) {
@@ -199,7 +201,7 @@ class TeacherScheduleViewModel(
             try {
                 _uiState.value = _uiState.value.copy(isLoading = true, loadError = false)
                 try {
-                    scheduleRepository.syncPeriod(ScheduleDates.moscowToday()).collect { }
+                    scheduleRepository.syncPeriod(ScheduleDates.moscowToday(), force = true).collect { }
                 } catch (e: CancellationException) {
                     throw e
                 } catch (e: Exception) {

app/src/main/res/raw/globalsign_root_r46.pem

@@ -0,0 +1,27 @@
+-----BEGIN CERTIFICATE-----
+MIIFWjCCA0KgAwIBAgISEdK7udcjGJ5AXwqdLdDfJWfRMA0GCSqGSIb3DQEBDAUAMEYxCzAJBgNV
+BAYTAkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMRwwGgYDVQQDExNHbG9iYWxTaWduIFJv
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+DEJ4Y9HiD2971KE9dJeFt0g5QdYg/NA6s/rob8SKunE3vouXsXgxT7PntgMTzlSdriVZzH81Xwj3
+QEUxeCp6
+-----END CERTIFICATE-----

app/src/main/res/xml/network_security_config.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Сертификат vyatsu.ru перевыпущен 05.10.2026 и теперь выдан в иерархии
+  GlobalSign Root R46, которая в системный trust store Android попала
+  только в Android 14. На устройствах с Android 13 и ниже все HTTPS-запросы
+  к сайту падают с "Trust anchor for certification path not found".
+
+  Добавляем этот корень как дополнительный якорь доверия ТОЛЬКО для доменов
+  vyatsu.ru — системные корни сохраняются, остальные сайты не затронуты.
+-->
+<network-security-config>
+    <base-config>
+        <trust-anchors>
+            <certificates src="system" />
+        </trust-anchors>
+        <cleartextTrafficPermitted>false</cleartextTrafficPermitted>
+    </base-config>
+    <domain-config>
+        <domain includeSubdomains="true">vyatsu.ru</domain>
+        <trust-anchors>
+            <certificates src="system" />
+            <certificates src="@raw/globalsign_root_r46" />
+        </trust-anchors>
+    </domain-config>
+</network-security-config>