# 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
```