Make stats DSL primary with highlighted editor, completion and live diagnostics

app/routes.py

@@ -29,7 +29,7 @@ from .extensions import db, limiter
 from .history import activity_page, latest_mapped_run, overview, records_for
 from .models import Activity, Friendship, GarminConnection, User
 from .services import activity_data, import_cache, import_upload, route_data
-from .stats import DEFAULT, METRICS, explore, parse_query, query_text
+from .stats import DEFAULT, METRICS, explore, parse_query, period_bounds, query_text
 
 web = Blueprint("web", __name__)
 DUMMY_HASH = generate_password_hash("not-a-real-account-password")
@@ -242,6 +242,23 @@ def stats_runs():
     )
 
 
+@web.post("/stats/validate")
+@login_required
+@limiter.limit("120 per minute")
+def stats_validate():
+    payload = request.get_json(silent=True)
+    if not isinstance(payload, dict) or not isinstance(payload.get("query"), str):
+        return jsonify(valid=False, diagnostics=[{"line": 1, "message": "Supply query text."}]), 400
+    try:
+        query = parse_query({"query": payload["query"]})
+        period_bounds(query, current_user.timezone)
+        return jsonify(valid=True, canonical=query_text(query), diagnostics=[])
+    except (ValueError, OverflowError) as exc:
+        return jsonify(
+            valid=False, diagnostics=[{"line": getattr(exc, "line", 1), "message": str(exc)}]
+        )
+
+
 @web.route("/friends", methods=["GET", "POST"])
 @login_required
 @limiter.limit("20 per hour", methods=["POST"])