feat: add sort params to list/search, capo-aware GET /songs/{id}?apply_capo=true

crates/api/src/routes/songs.rs

@@ -3,7 +3,7 @@ use axum::{
     http::StatusCode,
     Json,
 };
-use domain::RepositoryError;
+use domain::{ChordTransposer, RepositoryError, SortField, SortOrder};
 use serde::Deserialize;
 use std::sync::Arc;
 use uuid::Uuid;
@@ -11,6 +11,8 @@ use uuid::Uuid;
 #[derive(Deserialize)]
 pub struct ListQuery {
     pub q: Option<String>,
+    pub sort: Option<String>,
+    pub order: Option<String>,
 }
 
 use crate::routes::tabs::{AppState, ErrorResponse, ParseRequest, resolve_html};
@@ -38,10 +40,19 @@ pub async fn list_songs(
     State(state): State<Arc<AppState>>,
     Query(params): Query<ListQuery>,
 ) -> Result<Json<Vec<domain::SongSummary>>, (StatusCode, Json<ErrorResponse>)> {
+    let sort = match params.sort.as_deref() {
+        Some("title") => SortField::Title,
+        Some("artist") => SortField::Artist,
+        _ => SortField::Date,
+    };
+    let order = match params.order.as_deref() {
+        Some("asc") => SortOrder::Asc,
+        _ => SortOrder::Desc,
+    };
     let result = if let Some(q) = params.q.filter(|s| !s.is_empty()) {
-        state.search.search(&q).await
+        state.search.search(&q, sort, order).await
     } else {
-        state.songs.list().await
+        state.songs.list(sort, order).await
     };
     result
         .map(Json)
@@ -80,19 +91,37 @@ pub async fn update_song(
         })
 }
 
+#[derive(Deserialize)]
+pub struct GetSongQuery {
+    pub apply_capo: Option<bool>,
+}
+
 pub async fn get_song(
     State(state): State<Arc<AppState>>,
     Path(id): Path<String>,
+    Query(params): Query<GetSongQuery>,
 ) -> Result<Json<domain::Song>, (StatusCode, Json<ErrorResponse>)> {
     let uuid = Uuid::parse_str(&id).map_err(|_| {
         (StatusCode::BAD_REQUEST, Json(ErrorResponse { error: "Invalid ID".into() }))
     })?;
 
-    match state.songs.get(uuid).await {
-        Ok(Some(song)) => Ok(Json(song)),
-        Ok(None) => Err((StatusCode::NOT_FOUND, Json(ErrorResponse { error: "Not found".into() }))),
-        Err(e) => Err((StatusCode::INTERNAL_SERVER_ERROR, Json(ErrorResponse { error: e.to_string() }))),
+    let song = match state.songs.get(uuid).await {
+        Ok(Some(s)) => s,
+        Ok(None) => return Err((StatusCode::NOT_FOUND, Json(ErrorResponse { error: "Not found".into() }))),
+        Err(e) => return Err((StatusCode::INTERNAL_SERVER_ERROR, Json(ErrorResponse { error: e.to_string() }))),
+    };
+
+    let song = if params.apply_capo.unwrap_or(false) {
+        if let Some(capo) = song.meta.capo {
+            ChordTransposer.transpose_song(&song, capo as i8)
+        } else {
+            song
         }
+    } else {
+        song
+    };
+
+    Ok(Json(song))
 }
 
 pub async fn delete_song(

crates/common/src/lib.rs

@@ -1,4 +1,4 @@
-use domain::{RepositoryError, Song, SongRepositoryPort, SongSearchPort, SongSummary, StoredSong};
+use domain::{RepositoryError, Song, SongRepositoryPort, SongSearchPort, SongSummary, StoredSong, SortField, SortOrder};
 use uuid::Uuid;
 
 pub struct SongService {
@@ -14,8 +14,8 @@ impl SongService {
         self.repo.save(song).await
     }
 
-    pub async fn list(&self) -> Result<Vec<SongSummary>, RepositoryError> {
-        self.repo.list().await
+    pub async fn list(&self, sort: SortField, order: SortOrder) -> Result<Vec<SongSummary>, RepositoryError> {
+        self.repo.list(sort, order).await
     }
 
     pub async fn get(&self, id: Uuid) -> Result<Option<Song>, RepositoryError> {
@@ -46,7 +46,7 @@ impl SongSearchService {
         Self { search }
     }
 
-    pub async fn search(&self, query: &str) -> Result<Vec<domain::SongSummary>, domain::RepositoryError> {
-        self.search.search(query).await
+    pub async fn search(&self, query: &str, sort: SortField, order: SortOrder) -> Result<Vec<domain::SongSummary>, domain::RepositoryError> {
+        self.search.search(query, sort, order).await
     }
 }

crates/domain/src/lib.rs

@@ -9,5 +9,5 @@ pub use chord::Chord;
 pub use song::{ChordPosition, LyricLine, Section, SectionKind, SongMeta, Song};
 pub use song::{song_preview_chords, StoredSong, SongSummary};
 pub use ports::{FetchError, ParseError, TabFetcherPort, TabParserPort, TabSource};
-pub use ports::{RepositoryError, SongRepositoryPort, SongSearchPort};
+pub use ports::{RepositoryError, SongRepositoryPort, SongSearchPort, SortField, SortOrder};
 pub use transposer::{ChordTransposer, TransposeError};

crates/domain/src/ports.rs

@@ -39,6 +39,21 @@ pub trait TabParserPort: Send + Sync {
 use uuid::Uuid;
 use crate::song::{StoredSong, SongSummary};
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+pub enum SortField {
+    #[default]
+    Date,
+    Title,
+    Artist,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+pub enum SortOrder {
+    #[default]
+    Desc,
+    Asc,
+}
+
 #[derive(Debug, Error)]
 pub enum RepositoryError {
     #[error("Song not found")]
@@ -50,7 +65,7 @@ pub enum RepositoryError {
 #[async_trait]
 pub trait SongRepositoryPort: Send + Sync {
     async fn save(&self, song: &Song) -> Result<StoredSong, RepositoryError>;
-    async fn list(&self) -> Result<Vec<SongSummary>, RepositoryError>;
+    async fn list(&self, sort: SortField, order: SortOrder) -> Result<Vec<SongSummary>, RepositoryError>;
     async fn get(&self, id: Uuid) -> Result<Option<Song>, RepositoryError>;
     async fn delete(&self, id: Uuid) -> Result<(), RepositoryError>;
     async fn update_meta(
@@ -64,5 +79,5 @@ pub trait SongRepositoryPort: Send + Sync {
 
 #[async_trait]
 pub trait SongSearchPort: Send + Sync {
-    async fn search(&self, query: &str) -> Result<Vec<SongSummary>, RepositoryError>;
+    async fn search(&self, query: &str, sort: SortField, order: SortOrder) -> Result<Vec<SongSummary>, RepositoryError>;
 }

crates/infrastructure/persistence/src/lib.rs

@@ -1,11 +1,23 @@
 use async_trait::async_trait;
 use domain::{
     RepositoryError, Song, SongMeta, SongRepositoryPort, SongSearchPort, SongSummary, StoredSong,
+    SortField, SortOrder,
     song_preview_chords,
 };
 use sqlx::SqlitePool;
 use uuid::Uuid;
 
+fn sort_clause(field: SortField, order: SortOrder) -> &'static str {
+    match (field, order) {
+        (SortField::Title,  SortOrder::Asc)  => "ORDER BY title ASC",
+        (SortField::Title,  SortOrder::Desc) => "ORDER BY title DESC",
+        (SortField::Artist, SortOrder::Asc)  => "ORDER BY artist ASC",
+        (SortField::Artist, SortOrder::Desc) => "ORDER BY artist DESC",
+        (SortField::Date,   SortOrder::Asc)  => "ORDER BY created_at ASC",
+        (SortField::Date,   SortOrder::Desc) => "ORDER BY created_at DESC",
+    }
+}
+
 #[derive(Clone)]
 pub struct SqliteSongRepository {
     pool: SqlitePool,
@@ -57,10 +69,12 @@ impl SongRepositoryPort for SqliteSongRepository {
         Ok(StoredSong { id, song: song.clone() })
     }
 
-    async fn list(&self) -> Result<Vec<SongSummary>, RepositoryError> {
-        let rows = sqlx::query_as::<_, SongRow>(
-            "SELECT id, title, artist, original_key, preview_chords, body FROM songs ORDER BY created_at DESC"
-        )
+    async fn list(&self, sort: SortField, order: SortOrder) -> Result<Vec<SongSummary>, RepositoryError> {
+        let sql = format!(
+            "SELECT id, title, artist, original_key, preview_chords, body FROM songs {}",
+            sort_clause(sort, order)
+        );
+        let rows = sqlx::query_as::<_, SongRow>(&sql)
             .fetch_all(&self.pool)
             .await
             .map_err(|e| RepositoryError::Internal(e.to_string()))?;
@@ -158,13 +172,15 @@ impl SongRepositoryPort for SqliteSongRepository {
 
 #[async_trait]
 impl SongSearchPort for SqliteSongRepository {
-    async fn search(&self, query: &str) -> Result<Vec<SongSummary>, RepositoryError> {
+    async fn search(&self, query: &str, sort: SortField, order: SortOrder) -> Result<Vec<SongSummary>, RepositoryError> {
         let escaped = query.replace('\\', "\\\\").replace('%', "\\%").replace('_', "\\_");
         let pattern = format!("%{}%", escaped);
-        let rows = sqlx::query_as::<_, SongRow>(
+        let sql = format!(
             "SELECT id, title, artist, original_key, preview_chords, body FROM songs \
-             WHERE (title LIKE ? ESCAPE '\\' OR artist LIKE ? ESCAPE '\\') ORDER BY created_at DESC"
-        )
+             WHERE (title LIKE ? ESCAPE '\\' OR artist LIKE ? ESCAPE '\\') {}",
+            sort_clause(sort, order)
+        );
+        let rows = sqlx::query_as::<_, SongRow>(&sql)
             .bind(&pattern)
             .bind(&pattern)
             .fetch_all(&self.pool)