application: library bounded context

crates/application/src/library/list_genres.rs

@@ -0,0 +1,33 @@
+use domain::errors::{DomainError, DomainResult};
+use domain::value_objects::ContentType;
+
+use super::deps::LibraryQueryDeps;
+use super::queries::ListGenresQuery;
+
+/// List genres available in the library, optionally filtered.
+pub async fn execute(deps: &LibraryQueryDeps, query: ListGenresQuery) -> DomainResult<Vec<String>> {
+    let content_type = query
+        .content_type
+        .as_deref()
+        .map(parse_content_type)
+        .transpose()?;
+
+    deps.library_query
+        .list_genres(content_type.as_ref(), query.provider_id.as_deref())
+        .await
+}
+
+fn parse_content_type(s: &str) -> DomainResult<ContentType> {
+    match s {
+        "movie" => Ok(ContentType::Movie),
+        "episode" => Ok(ContentType::Episode),
+        "short" => Ok(ContentType::Short),
+        other => Err(DomainError::ValidationError(format!(
+            "Unknown content type '{other}'. Use movie, episode, or short."
+        ))),
+    }
+}
+
+#[cfg(test)]
+#[path = "tests/list_genres.rs"]
+mod tests;