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openspec/changes/enterprise-react-calendar/proposal.md

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+# OpenSpec Change: enterprise-react-calendar
+
+- **Change ID**: enterprise-react-calendar
+- **Package**: `@suaveplan/react-calendar`
+- **Category**: react
+- **Target path**: `react/forms/react-calendar`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/react-calendar.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/react-calendar` on genesis from scratch at enterprise quality. Headless calendar engine (`useCalendar`) plus `Calendar` component with month/week/day/agenda views. Ships four per-view components, `CalendarHeader`, typed `CalendarEvent`/`CalendarEventMap` with `@suaveplan/events` emitter. Genesis adds Storybook stories (zero currently exist), Playwright E2E, event store indexing for O(1) lookups, and `@suaveplan/datetime` integration for timezone-aware date math.
+
+---
+
+## Current-state audit (genesis)
+
+Package does not exist on genesis — fresh build.
+
+---
+
+## Available workspace deps on genesis
+
+| Package | Role |
+|---|---|
+| `@suaveplan/error` (`workspace:^`) | `CalendarError` |
+| `@suaveplan/events` (`workspace:^`) | `EventBus` for calendar events |
+| `@suaveplan/datetime` (`workspace:^`) | Timezone-aware date math |
+| `@suaveplan/react-translate` (`workspace:^`) | i18n |
+| `zod` (`catalog:forms`) | Event/config schemas |
+| `@opentelemetry/api` (`catalog:observability`) | `calendar.navigate` span |
+
+External: `tslib catalog:build`. React 18 peer.
+
+---
+
+## Preserved public API surface
+
+```ts
+Calendar, CalendarAgendaView, CalendarDayView, CalendarHeader,
+CalendarMonthView, CalendarWeekView
+useCalendar (+ UseCalendarReturn)
+
+// Types
+CalendarConfig, CalendarEvent, CalendarEventMap,
+CalendarHeaderProps, CalendarProps, CalendarView,
+CalendarViewProps, DateRange, NavigationDirection
+```
+
+---
+
+## New additions for genesis
+
+1. **`@suaveplan/datetime` integration** — `useCalendar` uses `@suaveplan/datetime` `addDuration`/`startOf`/`endOf` for view range computation; accepts optional `timeZone`.
+2. **O(1) event lookup** — event store is a `Map<string, CalendarEvent[]>` keyed by ISO date string.
+3. **`CalendarError`** — codes: `CALENDAR_INVALID_EVENT`, `CALENDAR_VIEW_NOT_SUPPORTED`.
+4. **Stories** — `Calendar` (month, week, day, agenda, with-events, empty, playground), `CalendarHeader` (all navigations), each view component.
+5. **Playwright E2E** — click next/prev, verify date advances; add event, verify appears in month view.
+
+---
+
+## File layout
+
+```text
+react/forms/react-calendar/
+  package.json
+  tsconfig.json
+  vitest.config.ts
+  src/
+    index.ts
+    hooks/
+      use-calendar/ (ts + types + md + test + index)
+    components/
+      calendar/ (tsx + types + md + test + stories + index)
+      calendar-header/ (tsx + types + md + test + stories + index)
+      month-view/ week-view/ day-view/ agenda-view/
+    types/
+      calendar.types.ts
+    utils/
+      cn.ts
+  e2e/
+    calendar.spec.ts
+```