feat(export): modal gains assignable axes + group-by control

frontend/src/components/ExportDataModal.jsx

@@ -2,9 +2,12 @@ import React, { useEffect, useMemo, useState } from 'react';
 import { experimentsApi } from '../api/client';
 import Button from './ui/Button';
 import Alert from './ui/Alert';
-import { listExportableParams, buildMatrix, toCSV, csvFilename } from '../lib/dataExport';
+import {
+  EXPORT_DIMENSIONS, dimLabel, otherDimension,
+  listDimensionMembers, buildMatrix, toCSV, csvFilename,
+} from '../lib/dataExport';
 
-const GROUP_LABELS = { metrics: 'Session metrics', daily: 'Daily record fields' };
+const PARAM_GROUP_LABELS = { metrics: 'Session metrics', daily: 'Daily record fields' };
 
 function triggerDownload(filename, text) {
   const blob = new Blob([text], { type: 'text/csv;charset=utf-8;' });
@@ -18,11 +21,17 @@ function triggerDownload(filename, text) {
   setTimeout(() => URL.revokeObjectURL(url), 0);
 }
 
-export default function ExportDataModal({ experimentTitle, experimentId, dailyTemplate, animals, onClose }) {
+export default function ExportDataModal({
+  experimentTitle, experimentId, dailyTemplate, animals, subjectTemplate = [], groupField = '__none__', onClose,
+}) {
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState(null);
   const [statuses, setStatuses] = useState([]);
-  const [selectedId, setSelectedId] = useState(null);
+
+  const [rowDim, setRowDim] = useState('date');
+  const [colDim, setColDim] = useState('subject');
+  const [pinnedId, setPinnedId] = useState(null);
+  const [groupBy, setGroupBy] = useState(groupField ?? '__none__');
 
   useEffect(() => {
     let alive = true;
@@ -35,33 +44,42 @@ export default function ExportDataModal({ experimentTitle, experimentId, dailyTe
     return () => { alive = false; };
   }, [experimentId]);
 
-  const params = useMemo(() => listExportableParams(dailyTemplate, statuses), [dailyTemplate, statuses]);
+  const pinnedDim = otherDimension(rowDim, colDim);
+  const subjectIsAxis = rowDim === 'subject' || colDim === 'subject';
+  const effGroup = subjectIsAxis ? groupBy : '__none__';
+  const ctx = useMemo(() => ({ statuses, animals, dailyTemplate }), [statuses, animals, dailyTemplate]);
 
-  // Derive the effective selection: the user's pick, else the first parameter.
-  const effectiveId = selectedId ?? params[0]?.id ?? null;
-  const selectedParam = params.find((p) => p.id === effectiveId) ?? null;
+  // Members of the pinned dimension populate its value dropdown.
+  const pinnedMembers = useMemo(
+    () => listDimensionMembers(pinnedDim, { ...ctx, groupField: effGroup }),
+    [pinnedDim, ctx, effGroup],
+  );
+  const effPinnedId = pinnedId ?? pinnedMembers[0]?.id ?? null;
+  const pinnedMember = pinnedMembers.find((m) => m.id === effPinnedId) ?? pinnedMembers[0] ?? null;
 
   const matrix = useMemo(
-    () => (selectedParam ? buildMatrix(statuses, animals, selectedParam) : { columns: [], rows: [] }),
-    [statuses, animals, selectedParam],
+    () => (pinnedMember
+      ? buildMatrix({ rowDim, colDim, pinnedMember, groupField: effGroup }, ctx)
+      : { columns: [], rows: [], context: { label: '', value: '' }, corner: '', groupAxis: null }),
+    [rowDim, colDim, pinnedMember, effGroup, ctx],
   );
-
   const hasData = matrix.rows.length > 0;
 
-  // Group params for <optgroup> rendering, preserving order.
-  const grouped = useMemo(() => {
-    const out = [];
-    for (const p of params) {
-      let g = out.find((x) => x.group === p.group);
-      if (!g) { g = { group: p.group, items: [] }; out.push(g); }
-      g.items.push(p);
-    }
-    return out;
-  }, [params]);
+  // When the user changes an axis, keep the two distinct and reset the pinned pick.
+  function changeRowDim(next) {
+    setRowDim(next);
+    if (colDim === next) setColDim(otherDimension(next, null) ?? EXPORT_DIMENSIONS.find((d) => d.dim !== next).dim);
+    setPinnedId(null);
+  }
+  function changeColDim(next) {
+    setColDim(next);
+    if (rowDim === next) setRowDim(EXPORT_DIMENSIONS.find((d) => d.dim !== next).dim);
+    setPinnedId(null);
+  }
 
   function handleExport() {
-    if (!hasData || !selectedParam) return;
-    triggerDownload(csvFilename(experimentTitle, selectedParam.label), toCSV(matrix));
+    if (!hasData || !pinnedMember) return;
+    triggerDownload(csvFilename(experimentTitle, pinnedMember.label), toCSV(matrix));
     onClose();
   }
 
@@ -69,38 +87,72 @@ export default function ExportDataModal({ experimentTitle, experimentId, dailyTe
   if (error) return (
     <div className="space-y-4">
       <Alert type="error" message={error} />
-      <div className="flex justify-end">
-        <Button variant="secondary" onClick={onClose}>Close</Button>
-      </div>
+      <div className="flex justify-end"><Button variant="secondary" onClick={onClose}>Close</Button></div>
     </div>
   );
 
+  const selectCls = 'w-full border border-gray-200 rounded px-2 py-1.5 text-sm bg-white focus:outline-none focus:ring-1 focus:ring-indigo-400';
+  const colOptions = EXPORT_DIMENSIONS.filter((d) => d.dim !== rowDim);
+
   return (
     <div className="space-y-4">
       <p className="text-sm text-gray-500">
-        Export one parameter as a CSV file — each row is a date, each column is a subject.
+        Choose what goes on the rows and columns. The remaining dimension is fixed to one value, shown at the top of the file.
       </p>
 
+      <div className="grid grid-cols-2 gap-3">
+        <div>
+          <label htmlFor="export-rows" className="block text-xs font-medium text-gray-500 mb-1">Rows</label>
+          <select id="export-rows" value={rowDim} onChange={(e) => changeRowDim(e.target.value)} className={selectCls}>
+            {EXPORT_DIMENSIONS.map((d) => <option key={d.dim} value={d.dim}>{d.label}</option>)}
+          </select>
+        </div>
+        <div>
+          <label htmlFor="export-cols" className="block text-xs font-medium text-gray-500 mb-1">Columns</label>
+          <select id="export-cols" value={colDim} onChange={(e) => changeColDim(e.target.value)} className={selectCls}>
+            {colOptions.map((d) => <option key={d.dim} value={d.dim}>{d.label}</option>)}
+          </select>
+        </div>
+      </div>
+
       <div>
-        <label htmlFor="export-param" className="block text-xs font-medium text-gray-500 mb-1">Parameter</label>
+        <label htmlFor="export-pinned" className="block text-xs font-medium text-gray-500 mb-1">
+          Fixed: {dimLabel(pinnedDim)}
+        </label>
         <select
-          id="export-param"
-          value={effectiveId ?? ''}
-          onChange={(e) => setSelectedId(e.target.value)}
-          className="w-full border border-gray-200 rounded px-2 py-1.5 text-sm bg-white focus:outline-none focus:ring-1 focus:ring-indigo-400"
+          id="export-pinned"
+          value={effPinnedId ?? ''}
+          onChange={(e) => setPinnedId(e.target.value)}
+          className={selectCls}
         >
-          {grouped.map((g) => (
-            <optgroup key={g.group} label={GROUP_LABELS[g.group] ?? g.group}>
-              {g.items.map((p) => <option key={p.id} value={p.id}>{p.label}</option>)}
-            </optgroup>
-          ))}
+          {pinnedDim === 'parameter'
+            ? groupParamMembers(pinnedMembers).map((g) => (
+                <optgroup key={g.group} label={PARAM_GROUP_LABELS[g.group] ?? g.group}>
+                  {g.items.map((m) => <option key={m.id} value={m.id}>{m.label}</option>)}
+                </optgroup>
+              ))
+            : pinnedMembers.map((m) => <option key={m.id} value={m.id}>{m.label}</option>)}
         </select>
       </div>
 
+      {subjectIsAxis && (
+        <div>
+          <label htmlFor="export-group" className="block text-xs font-medium text-gray-500 mb-1">Group by</label>
+          <select id="export-group" value={groupBy} onChange={(e) => setGroupBy(e.target.value)} className={selectCls}>
+            <option value="__none__">— None —</option>
+            <option value="__name__">Name</option>
+            <option value="__id__">Subject ID</option>
+            {subjectTemplate.filter((f) => f.active).map((f) => (
+              <option key={f.fieldId} value={f.fieldId}>{f.label}</option>
+            ))}
+          </select>
+        </div>
+      )}
+
       <p className="text-xs text-gray-400">
         {hasData
-          ? `${matrix.rows.length} date${matrix.rows.length !== 1 ? 's' : ''} × ${matrix.columns.length} subject${matrix.columns.length !== 1 ? 's' : ''}`
-          : 'No data for this parameter yet.'}
+          ? `${matrix.rows.length} ${matrix.corner.toLowerCase()}${matrix.rows.length !== 1 ? 's' : ''} × ${matrix.columns.length} ${dimLabel(colDim).toLowerCase()}${matrix.columns.length !== 1 ? 's' : ''}`
+          : 'No data for this selection yet.'}
       </p>
 
       <div className="flex justify-end gap-2 pt-2">
@@ -110,3 +162,14 @@ export default function ExportDataModal({ experimentTitle, experimentId, dailyTe
     </div>
   );
 }
+
+// Group parameter members by their .group for <optgroup> rendering, preserving order.
+function groupParamMembers(members) {
+  const out = [];
+  for (const m of members) {
+    let g = out.find((x) => x.group === m.group);
+    if (!g) { g = { group: m.group, items: [] }; out.push(g); }
+    g.items.push(m);
+  }
+  return out;
+}