Chat panel in the garden editor (#57) (#71)

Co-authored-by: Steve Dudenhoeffer <[email protected]>

web/src/lib/history.test.ts

@@ -113,3 +113,29 @@ describe('totalChanges', () => {
     ).toBe(13)
   })
 })
+
+describe('describeUndo with an unknown total', () => {
+  // The chat panel offers Undo on a turn knowing only its change set id — the
+  // agent's reply carries the id, not the tally. Inventing a denominator to
+  // fill the sentence would be worse than not having one.
+  it("doesn't invent a denominator it was never given", () => {
+    const out = describeUndo(
+      { id: 5 },
+      {
+        changeSet: changeSet({ id: 6, counts: [{ entityType: 'planting', op: 'delete', n: 2 }] }),
+        conflicts: [{ entityType: 'object', entityId: 7, reason: 'changed', name: 'North Bed' }],
+      },
+    )
+    expect(out.tone).toBe('partial')
+    expect(out.message).toBe('Partly undone — “North Bed” was edited since, so it was left alone.')
+    expect(out.message).not.toMatch(/\d+ of \d+/)
+  })
+
+  it('still reports a clean undo the same way', () => {
+    const out = describeUndo(
+      { id: 5 },
+      { changeSet: changeSet({ id: 6, counts: [{ entityType: 'object', op: 'update', n: 1 }] }), conflicts: [] },
+    )
+    expect(out).toEqual({ tone: 'ok', message: 'Undone.' })
+  })
+})