* do not prematurely abort diagnosis keys task, if there is no last server fetch time; before anything else store time stamp after successfully submitting keys to enf

* comments and logs

* We need to reset the tracked exposure detections on app reset.

* Make sure that all flow preferences reset when we use the app reset function.

* Add workaround for EncryptedSharedPreferences, it's `clear` behavior is not like a normal sharedpreference,
as no listeners are called when keys are removed.

* Fix failing test.

Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>

Catch case where we are trying to download on the same hour as previously, but on a new day. (#1670)

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>

Fix RiskLevelCalculationTask not being executed if no new match was found (EXPOSUREAPP-3849) (#1657)

* Execute risk calculation even if no match.

* Pass an "originTag" with each started task to support debugging efforts.
Fix unit test regression.

* Re-add missing download task arguments.

* Fix misleading log statement.

Fix config default values not being used if protobuf is missing the data structures (EXPOSUREAPP-3856) (#1649)

* Improve logging.

* Fix exposure detection config not using default values if protobuf structures are null.

* Fix key download config not using default values if protobuf structures are null.

Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>

* Test

* Test

* Test

* Test

* Test

* Test

* Test

* Test

* Test

* Test

* Test upload

* Test

* Test

* Test

* Test

* Test

* Cleaned

Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>

due to use of `sendBlocking`.

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

Refactor app config to source, check validity and improve edgecase handling (EXPOSUREAPP-3774,EXPOSUREAPP-3771) (#1623)

* Refactor app config in to source: remote, local and default.
Check validity on local config before requesting one from remote.

* Handle JSON/GSON related edge-case behavior.

* Set local time offset for the default config to 0.

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

* Don't limit the DownloadDiagnosisKeysTask to once a day (EXPOSUREAPP-3771)

* Start DownloadDiagnosisKeysTask only once every hour (EXPOSUREAPP-3771)

* Fix initial state after fresh install (EXPOSUREAPP-3771)

* please ktlint and small fix

* Remove debug notification

* Use task state instead of a dedicated retrieving status indicator

* remove empty line

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>
Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>

Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>

Release version 1.6.1

Cannot delete tests older than 21 days - DE: Tests die älter als 21 Tage sind, können nicht gelöscht werden (EXPOSUREAPP-2398) (#1586)

* 1. Replaced redundant uiStateState during test result fetch with a NetworkRequestWrapper that is able to represent multiple states. This allows for better request state handling throughout the app
2. Completely removed the SubmissionViewModel
3. Failure to fetch the test should now always display the invalid test card on the home screen

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

* Keep displaying fetching card on server errors as this usually does not indicate any problems with the test itself

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

* Fixing unit tests (mostly just syntax, one test case changed due to new card)

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

* Promoted unknown host exception to server exception

Co-authored-by: chris-cwa <69595386+chris-cwa@users.noreply.github.com>
Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

Merge 1.6.x into 1.7.x

Co-authored-by: Kolya Opahle <k.opahle@sap.com>
Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

# Conflicts:
#	Corona-Warn-App/src/main/java/de/rki/coronawarnapp/nearby/modules/detectiontracker/ExposureDetectionTrackerStorage.kt
#	Corona-Warn-App/src/main/java/de/rki/coronawarnapp/util/flow/HotDataFlow.kt
#	Corona-Warn-App/src/test/java/de/rki/coronawarnapp/util/flow/HotDataFlowTest.kt
#	gradle.properties

Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>

* Make config sharing behavior `SharingStarted.Lazily`. (start once, never release)
Otherwise classes that are just interested in the current config, if there is no other subscriber active,
would launch the `startValueProvider` and pull a config each time.

The ExposureDetectionTracker is such a candidate that would like to use the latest config every ~3min.

While this already no longer happens since "Track config changes" (4d1ecb54),
because there is no a class that is permanently subscribed to `currentConfig`, we should not rely on side-effects,
so let's make the sharing behavior explicit.

* Fix test regression.

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

* Fix HotDataFlow behavior.
* Prevent re-execution of past submissions when the observable goes cold.
* Guard internal value updates with a mutex in case the value update is not as thread-safe as we think it is.

* Fix problematic testcases.

* Update RiskLevelRepository.kt

* Removed comment

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

* Flush the json data after writing it, otherwise if the app process dies, we end up with an empty file.
GSON deserializes this into a null object that looks like a non-null object until it is evaluated some time later.

Force an evaluation via `require(it.size >= 0)` and delete the corrupt data file when catching the exception.

* Show a visible error dialog if we fail to save data.

* Used buffered versions of readers and writer.

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

* Catch cancellation exceptions for coroutines launched on the viewModelScope.

* Use the viewmodel provided launch method to use common handling.

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>
Co-authored-by: chris-cwa <69595386+chris-cwa@users.noreply.github.com>

Change-Id: I64e8b3a17346d3e14e3c7306c89100633afc104e

Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>