UpdateDetector.kt

@Singleton
class UpdateDetector @Inject constructor(private val updatePreferences: UpdatePreferences) {

    /**
     * Store in RAM version so that we can directly save new version in preferences while using previous version in same session (Singleton)
     */
    private var version = updatePreferences.version

    /**
     * Save current version into preferences. Must be called at app launch
     */
    fun updateVersion(currentVersion: String) {
        updatePreferences.version = currentVersion
    }

    /**
     * Check if the version in RAM exists and is lower than target version
     */
    fun doOnUpdate(targetVersion: String? = null, call: ((previousVersion: String?, newVersion: String) -> Unit)? = null) {
        val previousVersion = version
        val newVersion = updatePreferences.version
        if (previousVersion != null && newVersion != null &&
            Version(previousVersion).isLowerThan(targetVersion) &&
            Version(newVersion).isAtLeast(targetVersion)) {
            call?.invoke(previousVersion, newVersion)
        }
    }
}