Good changes

server-rs/src/routes/journey.rs

@@ -0,0 +1,58 @@
+use std::sync::Arc;
+
+use axum::http::StatusCode;
+use axum::response::Json;
+use serde::{Deserialize, Serialize};
+
+use crate::state::AppState;
+
+#[derive(Deserialize)]
+pub struct JourneyQuery {
+    postcode: String,
+    mode: String,
+    slug: String,
+}
+
+#[derive(Serialize)]
+pub struct JourneyResponse {
+    /// Raw JSON array of journey legs, or null if no journey data available.
+    journey: Option<serde_json::Value>,
+    /// Median (50th percentile) total travel time in minutes.
+    minutes: Option<i16>,
+    /// Best-case (5th percentile) total travel time in minutes (transit only).
+    best_minutes: Option<i16>,
+}
+
+pub async fn get_journey(
+    state: Arc<AppState>,
+    query: axum::extract::Query<JourneyQuery>,
+) -> Result<Json<JourneyResponse>, (StatusCode, String)> {
+    let store = &state.travel_time_store;
+
+    if !store.has_destination(&query.mode, &query.slug) {
+        return Err((
+            StatusCode::NOT_FOUND,
+            format!("No travel data for mode={} slug={}", query.mode, query.slug),
+        ));
+    }
+
+    let travel_data = store.get(&query.mode, &query.slug).map_err(|e| {
+        (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            format!("Failed to load travel data: {e}"),
+        )
+    })?;
+
+    let row = travel_data.get(&query.postcode);
+    let journey = row
+        .and_then(|r| r.journey.as_ref())
+        .and_then(|j| serde_json::from_str::<serde_json::Value>(j).ok());
+    let minutes = row.map(|r| r.minutes);
+    let best_minutes = row.and_then(|r| r.best_minutes);
+
+    Ok(Json(JourneyResponse {
+        journey,
+        minutes,
+        best_minutes,
+    }))
+}