Merge ticket/022-edit-existing-metric-declarations

webapp/src/components/Metrics.tsx

@@ -6,6 +6,7 @@ import {
   fetchMetricBucketValues,
   fetchMetricDeclarations,
   metricPrimitiveToDisplayString,
+  updateMetric,
   type BucketValue,
   type MetricDeclaration,
   type MetricParamMatcher,
@@ -88,6 +89,8 @@ export function Metrics({ range }: { range: TimeRange | null }) {
   const [submitError, setSubmitError] = useState<string | null>(null)
   const [submitting, setSubmitting] = useState(false)
   const [collapsed, setCollapsed] = useSectionCollapsed('metrics')
+  // Name of the declaration currently loaded into the form for editing, or `null` when the form is declaring a brand-new metric. Kept separate from `selected` (which drives the bucket-values view below) so clicking a badge can populate the form *and* select it for the values table at the same time, without either hiding the other.
+  const [editingName, setEditingName] = useState<string | null>(null)
 
   async function loadMetrics() {
     try {
@@ -133,29 +136,51 @@ export function Metrics({ range }: { range: TimeRange | null }) {
     setMatchers((prev) => prev.filter((_, i) => i !== index))
   }
 
+  function resetForm() {
+    setEditingName(null)
+    setName('')
+    setRegex('')
+    setMatchers([{ ...EMPTY_MATCHER }])
+    setSubmitError(null)
+  }
+
+  // Loads `metric`'s current values into the declaration form for editing, in addition to (not instead of) selecting it for the bucket-values view below — both a click handler for a declared-metric badge, so the two behaviors are always available together.
+  function editMetric(metric: MetricDeclaration) {
+    setEditingName(metric.name)
+    setName(metric.name)
+    setRegex(metric.message_match_regex)
+    setMatchers(metric.params.length > 0 ? metric.params.map((p) => ({ ...p })) : [{ ...EMPTY_MATCHER }])
+    setSubmitError(null)
+  }
+
+  function selectMetric(metric: MetricDeclaration) {
+    setSelected(metric.name)
+    editMetric(metric)
+  }
+
   async function handleSubmit(e: React.FormEvent) {
     e.preventDefault()
     setSubmitError(null)
     setSubmitting(true)
     try {
-      const declared = await declareMetric({
+      const request: MetricDeclaration = {
         name,
         message_match_regex: regex,
         params: matchers.filter((m) => m.param_name && m.capture_group),
-      })
-      setName('')
-      setRegex('')
-      setMatchers([{ ...EMPTY_MATCHER }])
+      }
+      const saved = editingName ? await updateMetric(editingName, request) : await declareMetric(request)
+      resetForm()
       await loadMetrics()
-      setSelected(declared.name)
+      setSelected(saved.name)
     } catch (err) {
-      setSubmitError(err instanceof ApiError ? err.message : 'Failed to declare metric')
+      setSubmitError(err instanceof ApiError ? err.message : `Failed to ${editingName ? 'update' : 'declare'} metric`)
     } finally {
       setSubmitting(false)
     }
   }
 
   const groups = groupByLabels(bucketValues)
+  const selectedMetric = metrics.find((m) => m.name === selected) ?? null
 
   return (
     <div className="border-b border-border text-sm">
@@ -258,14 +283,31 @@ export function Metrics({ range }: { range: TimeRange | null }) {
               ))}
             </div>
           </div>
+          {editingName && (
+            <div className="rounded border border-accent bg-accent/5 px-2 py-1 text-xs text-accent-text">
+              Editing "{editingName}"
+            </div>
+          )}
           {submitError && <div className="rounded border border-danger-border bg-danger-bg/50 px-2 py-1 text-xs text-danger-text">{submitError}</div>}
-          <button
-            type="submit"
-            disabled={submitting}
-            className="rounded border border-border-soft px-3 py-1 text-sm text-text-secondary hover:bg-surface-2 disabled:opacity-50"
-          >
-            {submitting ? 'Declaring…' : 'Declare metric'}
-          </button>
+          <div className="flex items-center gap-2">
+            <button
+              type="submit"
+              disabled={submitting}
+              className="rounded border border-border-soft px-3 py-1 text-sm text-text-secondary hover:bg-surface-2 disabled:opacity-50"
+            >
+              {submitting ? (editingName ? 'Saving…' : 'Declaring…') : editingName ? 'Save changes' : 'Declare metric'}
+            </button>
+            {editingName && (
+              <button
+                type="button"
+                onClick={resetForm}
+                disabled={submitting}
+                className="rounded border border-border-soft px-3 py-1 text-sm text-text-secondary hover:bg-surface-2 disabled:opacity-50"
+              >
+                Cancel
+              </button>
+            )}
+          </div>
         </form>
 
         <div className="min-w-0 flex-1">
@@ -275,7 +317,7 @@ export function Metrics({ range }: { range: TimeRange | null }) {
             {metrics.map((m) => (
               <button
                 key={m.name}
-                onClick={() => setSelected(m.name)}
+                onClick={() => selectMetric(m)}
                 className={`rounded border px-2 py-1 text-xs ${
                   selected === m.name
                     ? 'border-accent bg-accent/10 text-accent-text'
@@ -293,6 +335,26 @@ export function Metrics({ range }: { range: TimeRange | null }) {
               <div className="mb-1 text-xs text-text-subtle">
                 {selected} — {bucketValues.length} occurrence{bucketValues.length === 1 ? '' : 's'} in range
               </div>
+              {selectedMetric && (
+                <div className="mb-2 space-y-1 rounded border border-border-soft bg-surface-1 px-2 py-1.5 text-xs text-text-secondary">
+                  <div>
+                    <span className="text-text-subtle">Regex: </span>
+                    <span className="font-mono">{selectedMetric.message_match_regex}</span>
+                  </div>
+                  <div>
+                    <span className="text-text-subtle">Params: </span>
+                    {selectedMetric.params.length === 0 ? (
+                      <span className="text-text-faint">none</span>
+                    ) : (
+                      <span className="font-mono">
+                        {selectedMetric.params
+                          .map((p) => `${p.param_name}←${p.capture_group} (${p.kind}, ${p.role ?? 'label'})`)
+                          .join(', ')}
+                      </span>
+                    )}
+                  </div>
+                </div>
+              )}
               {groups.length === 0 ? (
                 <div className="text-xs text-text-faint">No matching values in the active range.</div>
               ) : (