feat: add DownloadsViewModel for managing offline media downloads

feature/shared/src/main/java/hu/bbara/purefin/feature/shared/download/DownloadsViewModel.kt

@@ -0,0 +1,60 @@
+package hu.bbara.purefin.feature.shared.download
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import dagger.hilt.android.lifecycle.HiltViewModel
+import hu.bbara.purefin.core.data.OfflineMediaRepository
+import hu.bbara.purefin.core.data.navigation.MovieDto
+import hu.bbara.purefin.core.data.navigation.NavigationManager
+import hu.bbara.purefin.core.data.navigation.Route
+import hu.bbara.purefin.core.data.navigation.SeriesDto
+import hu.bbara.purefin.feature.download.MediaDownloadManager
+import hu.bbara.purefin.feature.shared.home.PosterItem
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.launch
+import org.jellyfin.sdk.model.UUID
+import org.jellyfin.sdk.model.api.BaseItemKind
+import javax.inject.Inject
+
+@HiltViewModel
+class DownloadsViewModel @Inject constructor(
+    private val offlineMediaRepository: OfflineMediaRepository,
+    private val navigationManager: NavigationManager,
+    private val downloadManager: MediaDownloadManager
+) : ViewModel() {
+
+    fun onMovieSelected(movieId: UUID) {
+        navigationManager.navigate(Route.MovieRoute(
+            MovieDto(
+                id = movieId,
+            )
+        ))
+    }
+
+    fun onSeriesSelected(seriesId: UUID) {
+        viewModelScope.launch {
+            navigationManager.navigate(Route.SeriesRoute(
+                SeriesDto(
+                    id = seriesId,
+                )
+            ))
+        }
+    }
+
+    val downloads = combine(
+        offlineMediaRepository.movies,
+        offlineMediaRepository.series
+    ) { movies, series ->
+        movies.values.map {
+            PosterItem(
+                type = BaseItemKind.MOVIE,
+                movie = it
+            )
+        } + series.values.map {
+            PosterItem(
+                type = BaseItemKind.SERIES,
+                series = it
+            )
+        }
+    }
+}