added snackbar

app/src/main/java/be/ugent/sel/studeez/common/snackbar/SnackBarManager.kt

@@ -0,0 +1,20 @@
+package be.ugent.sel.studeez.common.snackbar
+
+import androidx.annotation.StringRes
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+
+object SnackbarManager {
+    private val messages: MutableStateFlow<SnackbarMessage?> = MutableStateFlow(null)
+    val snackbarMessages: StateFlow<SnackbarMessage?>
+        get() = messages.asStateFlow()
+
+    fun showMessage(@StringRes message: Int) {
+        messages.value = SnackbarMessage.ResourceSnackbar(message)
+    }
+
+    fun showMessage(message: SnackbarMessage) {
+        messages.value = message
+    }
+}

app/src/main/java/be/ugent/sel/studeez/common/snackbar/SnackBarMessage.kt

@@ -0,0 +1,25 @@
+package be.ugent.sel.studeez.common.snackbar
+
+import android.content.res.Resources
+import androidx.annotation.StringRes
+import be.ugent.sel.studeez.R.string as AppText
+
+sealed class SnackbarMessage {
+    class StringSnackbar(val message: String) : SnackbarMessage()
+    class ResourceSnackbar(@StringRes val message: Int) : SnackbarMessage()
+
+    companion object {
+        fun SnackbarMessage.toMessage(resources: Resources): String {
+            return when (this) {
+                is StringSnackbar -> this.message
+                is ResourceSnackbar -> resources.getString(this.message)
+            }
+        }
+
+        fun Throwable.toSnackbarMessage(): SnackbarMessage {
+            val message = this.message.orEmpty()
+            return if (message.isNotBlank()) StringSnackbar(message)
+            else ResourceSnackbar(AppText.generic_error)
+        }
+    }
+}