---
phase: 03-event-write-back-pwa-install
plan: 05
type: execute
wave: 3
depends_on: ["03-03"]
files_modified:
  - apps/pwa/src/api/client.ts
  - apps/pwa/src/store/calendarStore.ts
  - apps/pwa/src/components/EventForm.tsx
  - apps/pwa/src/components/CalendarShell.tsx
autonomous: true
requirements: [CAL-04, CAL-05, CAL-07]
user_setup: []

must_haves:
  truths:
    - "A member can tap 'New Event', fill the form, and save — POST /api/events/create fires and the form closes"
    - "The form supports timed and all-day events, a recurrence preset (None/Daily/Weekly/Monthly/Yearly), title/location/description"
    - "The calendar picker is hidden when the member has exactly one writable calendar (D-02)"
    - "Edit mode pre-populates the form and calls PATCH /api/events/:uid/edit"
  artifacts:
    - path: "apps/pwa/src/components/EventForm.tsx"
      provides: "create/edit modal form (bottom sheet on phone, dialog on desktop)"
      min_lines: 80
    - path: "apps/pwa/src/api/client.ts"
      provides: "createEvent, updateEvent, fetchWritableCalendars typed calls"
      exports: ["createEvent", "updateEvent", "fetchWritableCalendars"]
  key_links:
    - from: "apps/pwa/src/components/EventForm.tsx"
      to: "/api/events/create"
      via: "createEvent mutation"
      pattern: "createEvent"
    - from: "apps/pwa/src/api/client.ts"
      to: "/api/events/writable-calendars"
      via: "fetchWritableCalendars GET"
      pattern: "writable-calendars"
    - from: "apps/pwa/src/components/CalendarShell.tsx"
      to: "EventForm"
      via: "New Event FAB toggles eventFormOpen"
      pattern: "eventFormOpen"
---

<objective>
Build the create/edit event UI: the typed write client calls, the Zustand form-state
keys, the `EventForm` modal (timed/all-day/recurring fields, conditional calendar
picker), and the "New Event" FAB/toolbar entry on the calendar shell. This is the
front half of the create and edit vertical slices — after this plan a member can
open the form and submit a write (delete + sync feedback land in Plan 06).

Purpose: CAL-04 (create timed/all-day) and CAL-07 (create recurring) become user-reachable.
Built against the UI Design Contract (03-UI-SPEC.md) for fields, copy, tokens, and
interaction; reuses the Phase 2 EventDetailPopover overlay/focus-trap/responsive pattern (D-10).
The calendar picker is populated from the authoritative `GET /api/events/writable-calendars`
endpoint (added in Plan 03) — the writable set (D-03) is owned by the server, not derived
on the client.

Output: EventForm + client write calls + store keys + FAB, all wired to the Plan 03 API.
</objective>

<execution_context>
@$HOME/.claude/get-shit-done/workflows/execute-plan.md
@$HOME/.claude/get-shit-done/templates/summary.md
</execution_context>

<context>
@.planning/phases/03-event-write-back-pwa-install/03-UI-SPEC.md
@.planning/phases/03-event-write-back-pwa-install/03-PATTERNS.md
@apps/pwa/src/api/client.ts
@apps/pwa/src/store/calendarStore.ts
@apps/pwa/src/components/EventDetailPopover.tsx
@apps/pwa/src/components/CalendarShell.tsx
</context>

<tasks>

<task type="auto" tdd="true">
  <name>Task 1: Typed write client calls + Zustand form-state keys</name>
  <files>apps/pwa/src/api/client.ts, apps/pwa/src/store/calendarStore.ts</files>
  <read_first>
    - apps/pwa/src/api/client.ts (existing — fetch function + interface-first pattern; CalendarOccurrence shape)
    - apps/pwa/src/store/calendarStore.ts (existing — CalendarStore interface + create() pattern)
    - .planning/phases/03-event-write-back-pwa-install/03-UI-SPEC.md (§State Management Contract — Zustand keys; §EventForm fields → request shape)
    - .planning/phases/03-event-write-back-pwa-install/03-PATTERNS.md (§client.ts — POST/PATCH fetch shape; §Zustand UI state)
    - .planning/phases/03-event-write-back-pwa-install/03-03-PLAN.md (Task 3 — GET /api/events/writable-calendars response shape `{ calendars: [{ url, displayName, color, isShared }] }`)
  </read_first>
  <behavior>
    Tests (extend pwa test suite where one exists, else add a small client unit test):
    - createEvent posts to /api/events/create with credentials:'include' and JSON body; returns { uid } on 202.
    - updateEvent PATCHes /api/events/:uid/edit.
    - fetchWritableCalendars GETs /api/events/writable-calendars and returns the WritableCalendar[] from the response's `calendars` array.
    - The Zustand store exposes the new keys with correct defaults.
  </behavior>
  <action>
    In client.ts add exported interfaces `CreateEventPayload` (title, allDay, start, end, optional location, description, recurrence: 'none'|'daily'|'weekly'|'monthly'|'yearly', calendarUrl?), `CreateEventResponse` ({ uid }), `WritableCalendar` ({ url, displayName, color, isShared }). Add `createEvent(payload): Promise<CreateEventResponse>` (POST), `updateEvent(uid, payload): Promise<CreateEventResponse>` (PATCH `/api/events/${uid}/edit`), and `fetchWritableCalendars(): Promise<WritableCalendar[]>` (GET `/api/events/writable-calendars`, added by Plan 03 Task 3 — call it unconditionally; parse the JSON `{ calendars }` envelope and return `body.calendars`). The server is the authoritative owner of the D-03 writable set; do NOT derive the writable set on the client. All follow the existing fetch shape with credentials:'include' and `if (!res.ok) throw`.

    In calendarStore.ts extend `CalendarStore` with `eventFormOpen: boolean`, `eventFormMode: 'create'|'edit'`, `eventFormUid: string|null`, plus setters `setEventForm(open, mode?, uid?)`. Defaults: closed, mode 'create', uid null. Keep all server data out of Zustand (D — server state stays in TanStack Query).
  </action>
  <verify>
    <automated>cd /home/luc/Projects/familysync && pnpm --filter @familysync/pwa exec tsc --noEmit && grep -q "createEvent" apps/pwa/src/api/client.ts && grep -q "writable-calendars" apps/pwa/src/api/client.ts && grep -q "eventFormOpen" apps/pwa/src/store/calendarStore.ts && pnpm --filter @familysync/pwa test</automated>
  </verify>
  <acceptance_criteria>
    - `grep -Eq "createEvent|updateEvent" apps/pwa/src/api/client.ts`.
    - `grep -q "writable-calendars" apps/pwa/src/api/client.ts` (calls the Plan 03 endpoint; no client-side derivation).
    - `grep -q "eventFormOpen" apps/pwa/src/store/calendarStore.ts`.
    - PWA tsc --noEmit passes; existing PWA tests stay green.
  </acceptance_criteria>
  <done>Write client calls (including fetchWritableCalendars against the Plan 03 endpoint) and form-state Zustand keys exist and type-check.</done>
</task>

<task type="auto" tdd="true">
  <name>Task 2: EventForm modal (create + edit) per UI Design Contract</name>
  <files>apps/pwa/src/components/EventForm.tsx</files>
  <read_first>
    - .planning/phases/03-event-write-back-pwa-install/03-UI-SPEC.md (§EventForm — field order/types/required; §CalendarPicker D-02; §Recurrence picker; §Copywriting Contract; §Interaction Contract all-day toggle + recurrence + keyboard; §Spacing/Typography/Color tokens)
    - apps/pwa/src/components/EventDetailPopover.tsx (analog — backdrop+dialog structure ~202-221, Escape+focus-trap useEffect ~143-159, responsive isPhone/dialogStyle ~165-199, design tokens, XSS plain-text rule)
    - .planning/phases/03-event-write-back-pwa-install/03-PATTERNS.md (§EventForm.tsx — modal/overlay, focus trap, TanStack mutation, Zustand)
    - apps/pwa/src/api/client.ts (createEvent/updateEvent/fetchWritableCalendars from Task 1)
  </read_first>
  <behavior>
    Tests (EventForm.test.tsx): renders title/all-day/start/end/recurrence/location/description fields; toggling "All day" hides time inputs; calendar picker is absent when fetchWritableCalendars returns one calendar and present when it returns two (D-02); empty title shows "Title is required"; end-before-start shows "End time must be after start"; submitting calls the createEvent mutation in create mode and updateEvent in edit mode; Escape and backdrop close the form.
  </behavior>
  <action>
    Implement `EventForm.tsx` as a modal overlay reusing the EventDetailPopover backdrop+dialog+focus-trap+responsive pattern (bottom sheet on phone, centered 480px dialog on desktop). Fields and order exactly per UI-SPEC §EventForm. All-day toggle (`role="switch"`) hides start/end time inputs and applies the auto-advance rule; defaults start 09:00/end 10:00 when toggled off. Recurrence as a segmented select (`role="radiogroup"` or `<select>`) of None/Daily/Weekly/Monthly/Yearly (D-11 whole-series; map to the recurrence enum). Calendar picker rendered only when `fetchWritableCalendars()` (TanStack Query, key `['writable-calendars']`) returns >1 (D-02); default selection = last-used (read from a localStorage key) else personal (D-01). Use `useMutation` (TanStack Query) calling `createEvent`/`updateEvent` by `eventFormMode`; on success close the form (`setEventForm(false)`) and set `lastSyncedUid` (added in Plan 06; if absent, store the returned uid in a placeholder for now). Validation: empty title and end-before-start show the exact UI-SPEC error copy in `--color-destructive`. All spacing/color via tokens; all field values rendered as plain-text JSX children (XSS guard); 44px min touch targets; `role="dialog"` `aria-modal="true"` `aria-label` "New Event"/"Edit Event"; focus the Title input on open; Escape/backdrop close. Edit mode pre-populates fields from the occurrence identified by `eventFormUid` (read from the TanStack `['events']` cache like EventDetailPopover does).
  </action>
  <verify>
    <automated>cd /home/luc/Projects/familysync && pnpm --filter @familysync/pwa test -- EventForm && pnpm --filter @familysync/pwa exec tsc --noEmit</automated>
  </verify>
  <acceptance_criteria>
    - EventForm.test.tsx GREEN (fields, all-day toggle, D-02 picker visibility, validation copy, create vs edit mutation, Escape/backdrop close).
    - `grep -q 'aria-modal="true"' apps/pwa/src/components/EventForm.tsx`.
    - No `dangerouslySetInnerHTML` in EventForm.tsx.
  </acceptance_criteria>
  <done>EventForm renders all contract fields, enforces D-02/D-11/validation, and submits create/edit; tests GREEN.</done>
</task>

<task type="auto">
  <name>Task 3: Mount EventForm + add "New Event" FAB/toolbar trigger on CalendarShell</name>
  <files>apps/pwa/src/components/CalendarShell.tsx</files>
  <read_first>
    - apps/pwa/src/components/CalendarShell.tsx (existing — where EventDetailPopover is mounted; toolbar/nav structure)
    - .planning/phases/03-event-write-back-pwa-install/03-UI-SPEC.md (§Interaction Contract — Create opens from FAB (phone) or toolbar button (desktop); Copywriting "New Event" + Plus icon)
    - apps/pwa/src/store/calendarStore.ts (eventFormOpen / setEventForm from Task 1)
  </read_first>
  <action>
    Mount `<EventForm />` in CalendarShell (conditionally rendered while `eventFormOpen`). Add a "New Event" entry point: a floating action button (Plus icon, lucide-react) bottom-right on phone and a toolbar button on tablet/desktop, both calling `setEventForm(true, 'create')`. Use the dark neutral primary fill (`--color-text-primary` bg, white label) per UI-SPEC — never an accent color. 44px min touch target. Do not alter existing read-only calendar rendering.
  </action>
  <verify>
    <automated>cd /home/luc/Projects/familysync && grep -q "EventForm" apps/pwa/src/components/CalendarShell.tsx && grep -q "setEventForm" apps/pwa/src/components/CalendarShell.tsx && pnpm --filter @familysync/pwa test && pnpm --filter @familysync/pwa exec tsc --noEmit</automated>
  </verify>
  <acceptance_criteria>
    - CalendarShell mounts EventForm and a "New Event" trigger that opens it in create mode.
    - Full PWA suite green; tsc --noEmit passes.
  </acceptance_criteria>
  <done>A member can open the create form from the calendar; EventForm is mounted and wired to Zustand.</done>
</task>

</tasks>

<threat_model>
## Trust Boundaries

| Boundary | Description |
|----------|-------------|
| form input → API | Member-typed event fields cross to the write API |

## STRIDE Threat Register

| Threat ID | Category | Component | Disposition | Mitigation Plan |
|-----------|----------|-----------|-------------|-----------------|
| T-03-15 | Tampering | XSS via event title/location/description in the form | mitigate | All values rendered as plain-text JSX children; never dangerouslySetInnerHTML (Phase 2 T-02e-01 pattern); server re-validates with zod (Plan 03) |
| T-03-16 | Elevation of Privilege | client offering a non-writable calendar in the picker | mitigate | Picker is populated only from the authoritative `GET /api/events/writable-calendars` set (Plan 03, D-03 enforced server-side); the client never derives writability, and the write endpoints re-enforce D-03 ownership on enqueue regardless |
</threat_model>

<verification>
- `pnpm --filter @familysync/pwa test` green (EventForm + existing).
- `pnpm --filter @familysync/pwa exec tsc --noEmit` passes.
- EventForm reachable from CalendarShell; D-02 picker conditional (driven by the writable-calendars endpoint); D-11 recurrence presets present.
</verification>

<success_criteria>
- CAL-04 and CAL-07 create paths are user-reachable through EventForm → POST /api/events/create.
- Edit mode pre-populates and PATCHes; calendar picker honors D-01/D-02, sourced from the Plan 03 writable-calendars endpoint.
</success_criteria>

<output>
Create `.planning/phases/03-event-write-back-pwa-install/03-05-SUMMARY.md` when done.
</output>