Library views with derived status (#83)

crates/arr-api/src/series.rs

@@ -50,6 +50,10 @@ pub struct Series {
     pub blocked: bool,
     /// `airing`, `incomplete`, `waiting`, `complete` or `ended` (§4.2).
     pub status: String,
+    /// Episodes currently marked wanted (§4.1 — the only intent).
+    pub wanted_episodes: i64,
+    /// Wanted episodes already on disk.
+    pub available_episodes: i64,
 }
 
 #[derive(Debug, Deserialize, ToSchema)]
@@ -262,6 +266,10 @@ fn status_name(status: SeriesStatus) -> &'static str {
 }
 
 fn with_status(row: &SeriesRow, episodes: &[arr_core::Episode], now: SystemTime) -> Series {
+    let wanted = episodes.iter().filter(|episode| episode.wanted);
+    let available = wanted
+        .clone()
+        .filter(|episode| episode.state == MediaState::Available);
     Series {
         id: row.id,
         tmdb_id: row.tmdb_id,
@@ -274,6 +282,8 @@ fn with_status(row: &SeriesRow, episodes: &[arr_core::Episode], now: SystemTime)
         upstream_ended: row.upstream_ended,
         blocked: row.blocked,
         status: status_name(derive_series_status(&core_series(row), episodes, now)).to_owned(),
+        wanted_episodes: i64::try_from(wanted.count()).unwrap_or(i64::MAX),
+        available_episodes: i64::try_from(available.count()).unwrap_or(i64::MAX),
     }
 }
 
@@ -1208,6 +1218,8 @@ mod tests {
             listed[0]["status"], "incomplete",
             "§4.2: an aired wanted episode with no file"
         );
+        assert_eq!(listed[0]["wanted_episodes"], 1);
+        assert_eq!(listed[0]["available_episodes"], 0);
 
         sqlx::query("UPDATE episodes SET state = 'available' WHERE id = ?")
             .bind(episode_id)