Initial commit.

app.py

@@ -0,0 +1,96 @@
+import asyncio
+from flask import Flask, render_template, redirect, url_for, request
+from datetime import date, timedelta
+
+from cache import get_cached, set_cached
+import scraper.eurostar as eurostar_scraper
+import scraper.realtime_trains as rtt_scraper
+from trip_planner import combine_trips
+
+app = Flask(__name__)
+
+DESTINATIONS = {
+    'paris':      'Paris Gare du Nord',
+    'brussels':   'Brussels Midi',
+    'lille':      'Lille Europe',
+    'amsterdam':  'Amsterdam Centraal',
+}
+
+
+async def _fetch_both(destination: str, travel_date: str, user_agent: str):
+    """Fetch GWR trains and Eurostar times simultaneously."""
+    gwr, es = await asyncio.gather(
+        rtt_scraper.fetch(travel_date, user_agent),
+        eurostar_scraper.fetch(destination, travel_date, user_agent),
+        return_exceptions=True,
+    )
+    return gwr, es
+
+
+@app.route('/')
+def index():
+    today = date.today().isoformat()
+    return render_template('index.html', destinations=DESTINATIONS, today=today)
+
+
+@app.route('/results/<slug>/<travel_date>')
+def results(slug, travel_date):
+    destination = DESTINATIONS.get(slug)
+    if not destination or not travel_date:
+        return redirect(url_for('index'))
+
+    user_agent = request.headers.get('User-Agent', rtt_scraper.DEFAULT_UA)
+
+    cache_key = f"{travel_date}_{destination}"
+    cached = get_cached(cache_key)
+
+    error = None
+    if cached:
+        gwr_trains = cached['gwr']
+        eurostar_trains = cached['eurostar']
+        from_cache = True
+    else:
+        from_cache = False
+        gwr_result, es_result = asyncio.run(_fetch_both(destination, travel_date, user_agent))
+
+        if isinstance(gwr_result, Exception):
+            gwr_trains = []
+            error = f"Could not fetch GWR trains: {gwr_result}"
+        else:
+            gwr_trains = gwr_result
+
+        if isinstance(es_result, Exception):
+            eurostar_trains = []
+            msg = f"Could not fetch Eurostar times: {es_result}"
+            error = f"{error}; {msg}" if error else msg
+        else:
+            eurostar_trains = es_result
+
+        if gwr_trains or eurostar_trains:
+            set_cached(cache_key, {'gwr': gwr_trains, 'eurostar': eurostar_trains})
+
+    trips = combine_trips(gwr_trains, eurostar_trains, travel_date)
+
+    dt = date.fromisoformat(travel_date)
+    prev_date = (dt - timedelta(days=1)).isoformat()
+    next_date = (dt + timedelta(days=1)).isoformat()
+    travel_date_display = dt.strftime('%A %-d %B %Y')
+
+    return render_template(
+        'results.html',
+        trips=trips,
+        destination=destination,
+        travel_date=travel_date,
+        slug=slug,
+        prev_date=prev_date,
+        next_date=next_date,
+        travel_date_display=travel_date_display,
+        gwr_count=len(gwr_trains),
+        eurostar_count=len(eurostar_trains),
+        from_cache=from_cache,
+        error=error,
+    )
+
+
+if __name__ == '__main__':
+    app.run(debug=True)