Initial commit

app/routes/api.py

@@ -0,0 +1,95 @@
+from flask import Blueprint, jsonify
+from app.auth import login_required
+from app.db import query
+
+bp = Blueprint("api", __name__, url_prefix="/api")
+
+
+@bp.route("/chart-data/<int:user_id>")
+@login_required
+def chart_data(user_id):
+    """Return weight & BMI over time for Chart.js."""
+    checkins = query(
+        """SELECT weight_kg, bmi, checked_in_at
+           FROM checkins WHERE user_id = %s
+           ORDER BY checked_in_at ASC""",
+        (user_id,),
+    )
+
+    labels = [c["checked_in_at"].strftime("%d %b") for c in checkins]
+    weights = [float(c["weight_kg"]) for c in checkins]
+    bmis = [float(c["bmi"]) if c["bmi"] else None for c in checkins]
+
+    return jsonify({
+        "labels": labels,
+        "weights": weights,
+        "bmis": bmis,
+    })
+
+
+@bp.route("/comparison")
+@login_required
+def comparison():
+    """Return all-user comparison data for bar charts."""
+    users = query("""
+        SELECT
+            u.id,
+            u.display_name,
+            u.username,
+            u.starting_weight_kg,
+            (SELECT weight_kg FROM checkins WHERE user_id = u.id ORDER BY checked_in_at ASC LIMIT 1) as first_weight,
+            (SELECT weight_kg FROM checkins WHERE user_id = u.id ORDER BY checked_in_at DESC LIMIT 1) as current_weight
+        FROM users u
+        WHERE (SELECT COUNT(*) FROM checkins WHERE user_id = u.id) > 0
+        ORDER BY u.display_name
+    """)
+
+    names = []
+    pct_lost = []
+    kg_lost = []
+
+    for u in users:
+        start_w = float(u["starting_weight_kg"] or u["first_weight"] or 0)
+        current_w = float(u["current_weight"] or start_w)
+        if start_w > 0:
+            lost = start_w - current_w
+            pct = round((lost / start_w) * 100, 1)
+        else:
+            lost = 0
+            pct = 0
+        names.append(u["display_name"] or u["username"])
+        pct_lost.append(pct)
+        kg_lost.append(round(lost, 1))
+
+    return jsonify({
+        "names": names,
+        "pct_lost": pct_lost,
+        "kg_lost": kg_lost,
+    })
+
+
+@bp.route("/weekly-change/<int:user_id>")
+@login_required
+def weekly_change(user_id):
+    """Return weekly weight changes for bar chart."""
+    checkins = query(
+        """SELECT weight_kg, checked_in_at
+           FROM checkins WHERE user_id = %s
+           ORDER BY checked_in_at ASC""",
+        (user_id,),
+    )
+
+    if len(checkins) < 2:
+        return jsonify({"labels": [], "changes": []})
+
+    labels = []
+    changes = []
+    for i in range(1, len(checkins)):
+        prev_w = float(checkins[i - 1]["weight_kg"])
+        curr_w = float(checkins[i]["weight_kg"])
+        change = round(curr_w - prev_w, 1)
+        label = checkins[i]["checked_in_at"].strftime("%d %b")
+        labels.append(label)
+        changes.append(change)
+
+    return jsonify({"labels": labels, "changes": changes})