Add organizer cancel-event flow to EventList

Organizers can now cancel events directly from the event list via the
existing PATCH /events/{eventToken} API. The confirmation dialog shows
role-differentiated messaging: "Cancel event?" with a severity warning
for organizers vs. "Remove event?" for attendees. Responses 204, 409,
and 404 all result in successful removal from the local list.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/e2e/cancel-event-list.spec.ts

@@ -0,0 +1,210 @@
+import { test, expect } from './msw-setup'
+import type { StoredEvent } from '../src/composables/useEventStorage'
+
+const STORAGE_KEY = 'fete:events'
+
+const organizerEvent: StoredEvent = {
+  eventToken: 'org-event-aaa',
+  title: 'Summer BBQ',
+  dateTime: '2027-06-15T18:00:00Z',
+  organizerToken: 'org-secret-token',
+}
+
+const attendeeEvent: StoredEvent = {
+  eventToken: 'att-event-bbb',
+  title: 'Team Meeting',
+  dateTime: '2027-01-10T09:00:00Z',
+  rsvpToken: 'rsvp-token-1',
+  rsvpName: 'Alice',
+}
+
+function seedEvents(events: StoredEvent[]): string {
+  return `window.localStorage.setItem('${STORAGE_KEY}', ${JSON.stringify(JSON.stringify(events))})`
+}
+
+test.describe('US1: Organizer Cancels Event from List', () => {
+  test('T001: organizer taps delete, confirms, event is removed after successful API call', async ({
+    page,
+    network,
+  }) => {
+    await page.addInitScript(seedEvents([organizerEvent, attendeeEvent]))
+
+    const { http, HttpResponse } = await import('msw')
+    let patchCalled = false
+    network.use(
+      http.patch('*/api/events/:token', ({ request, params }) => {
+        const url = new URL(request.url)
+        if (
+          params['token'] === organizerEvent.eventToken &&
+          url.searchParams.get('organizerToken') === organizerEvent.organizerToken
+        ) {
+          patchCalled = true
+          return new HttpResponse(null, { status: 204 })
+        }
+        return HttpResponse.json(
+          { type: 'about:blank', title: 'Forbidden', status: 403 },
+          { status: 403, headers: { 'Content-Type': 'application/problem+json' } },
+        )
+      }),
+    )
+
+    await page.goto('/')
+    await expect(page.getByText('Summer BBQ')).toBeVisible()
+
+    // Click delete on organizer event
+    await page.getByRole('button', { name: /Remove Summer BBQ/ }).click()
+
+    // Confirmation dialog appears with organizer-specific text
+    await expect(page.getByRole('alertdialog')).toBeVisible()
+
+    // Confirm cancellation
+    await page.getByRole('button', { name: 'Remove', exact: true }).click()
+
+    // Event is removed from list
+    await expect(page.getByText('Summer BBQ')).not.toBeVisible()
+    // Other event remains
+    await expect(page.getByText('Team Meeting')).toBeVisible()
+
+    expect(patchCalled).toBe(true)
+  })
+
+  test('T002: organizer confirms cancellation, API fails, event stays in list and error shown', async ({
+    page,
+    network,
+  }) => {
+    await page.addInitScript(seedEvents([organizerEvent]))
+
+    const { http, HttpResponse } = await import('msw')
+    network.use(
+      http.patch('*/api/events/:token', () => {
+        return HttpResponse.json(
+          {
+            type: 'about:blank',
+            title: 'Internal Server Error',
+            status: 500,
+          },
+          { status: 500, headers: { 'Content-Type': 'application/problem+json' } },
+        )
+      }),
+    )
+
+    await page.goto('/')
+    await page.getByRole('button', { name: /Remove Summer BBQ/ }).click()
+    await expect(page.getByRole('alertdialog')).toBeVisible()
+
+    await page.getByRole('button', { name: 'Remove', exact: true }).click()
+
+    // Event stays in list
+    await expect(page.getByText('Summer BBQ')).toBeVisible()
+  })
+
+  test('T003: organizer confirms cancellation, API returns 409 Conflict, event is silently removed', async ({
+    page,
+    network,
+  }) => {
+    await page.addInitScript(seedEvents([organizerEvent]))
+
+    const { http, HttpResponse } = await import('msw')
+    network.use(
+      http.patch('*/api/events/:token', () => {
+        return HttpResponse.json(
+          {
+            type: 'about:blank',
+            title: 'Conflict',
+            status: 409,
+            detail: 'Event is already cancelled.',
+          },
+          { status: 409, headers: { 'Content-Type': 'application/problem+json' } },
+        )
+      }),
+    )
+
+    await page.goto('/')
+    await page.getByRole('button', { name: /Remove Summer BBQ/ }).click()
+    await expect(page.getByRole('alertdialog')).toBeVisible()
+
+    await page.getByRole('button', { name: 'Remove', exact: true }).click()
+
+    // 409 treated as success — event removed
+    await expect(page.getByText('Summer BBQ')).not.toBeVisible()
+  })
+
+  test('T004: organizer opens cancel dialog then dismisses (cancel button), event remains', async ({
+    page,
+  }) => {
+    await page.addInitScript(seedEvents([organizerEvent]))
+    await page.goto('/')
+
+    await page.getByRole('button', { name: /Remove Summer BBQ/ }).click()
+    await expect(page.getByRole('alertdialog')).toBeVisible()
+
+    // Dismiss via Cancel button
+    await page.getByRole('button', { name: 'Cancel' }).click()
+
+    await expect(page.getByRole('alertdialog')).not.toBeVisible()
+    await expect(page.getByText('Summer BBQ')).toBeVisible()
+  })
+
+  test('T004b: organizer opens cancel dialog then dismisses via Escape', async ({ page }) => {
+    await page.addInitScript(seedEvents([organizerEvent]))
+    await page.goto('/')
+
+    await page.getByRole('button', { name: /Remove Summer BBQ/ }).click()
+    await expect(page.getByRole('alertdialog')).toBeVisible()
+
+    await page.keyboard.press('Escape')
+
+    await expect(page.getByRole('alertdialog')).not.toBeVisible()
+    await expect(page.getByText('Summer BBQ')).toBeVisible()
+  })
+
+  test('T004c: organizer opens cancel dialog then dismisses via overlay click', async ({
+    page,
+  }) => {
+    await page.addInitScript(seedEvents([organizerEvent]))
+    await page.goto('/')
+
+    await page.getByRole('button', { name: /Remove Summer BBQ/ }).click()
+    await expect(page.getByRole('alertdialog')).toBeVisible()
+
+    // Click on overlay (outside dialog)
+    await page.locator('.confirm-dialog__overlay').click({ position: { x: 10, y: 10 } })
+
+    await expect(page.getByRole('alertdialog')).not.toBeVisible()
+    await expect(page.getByText('Summer BBQ')).toBeVisible()
+  })
+})
+
+test.describe('US2: Distinct Dialog for Organizer vs. Attendee', () => {
+  test('T011: organizer dialog shows event-cancellation warning', async ({ page }) => {
+    await page.addInitScript(seedEvents([organizerEvent]))
+    await page.goto('/')
+
+    await page.getByRole('button', { name: /Remove Summer BBQ/ }).click()
+    const dialog = page.getByRole('alertdialog')
+    await expect(dialog).toBeVisible()
+
+    // Organizer-specific title and message
+    await expect(dialog.locator('.confirm-dialog__title')).toHaveText('Cancel event?')
+    await expect(dialog.locator('.confirm-dialog__message')).toContainText(
+      'all attendees',
+    )
+  })
+
+  test('T012: attendee dialog preserves existing RSVP-cancellation message', async ({
+    page,
+  }) => {
+    await page.addInitScript(seedEvents([attendeeEvent]))
+    await page.goto('/')
+
+    await page.getByRole('button', { name: /Remove Team Meeting/ }).click()
+    const dialog = page.getByRole('alertdialog')
+    await expect(dialog).toBeVisible()
+
+    // Attendee-specific title and message
+    await expect(dialog.locator('.confirm-dialog__title')).toHaveText('Remove event?')
+    await expect(dialog.locator('.confirm-dialog__message')).toContainText(
+      'attendance will be cancelled',
+    )
+  })
+})

frontend/e2e/cancel-rsvp.spec.ts

@@ -162,20 +162,20 @@ test.describe('US2: Auto-Cancel on Event List Removal', () => {
     await expect(page.getByText('your attendance will be cancelled')).toBeVisible()
   })
 
-  test('removal of non-RSVP\'d event shows standard dialog', async ({ page }) => {
-    const noRsvp: StoredEvent = {
-      eventToken: 'no-rsvp-token',
-      title: 'No RSVP Event',
+  test('removal of non-RSVP\'d watcher event shows standard dialog', async ({ page }) => {
+    const watcherEvent: StoredEvent = {
+      eventToken: 'watcher-token',
+      title: 'Watcher Event',
       dateTime: '2027-06-15T18:00:00Z',
-      organizerToken: 'org-123',
     }
-    await page.addInitScript(seedEvents([noRsvp]))
+    await page.addInitScript(seedEvents([watcherEvent]))
     await page.goto('/')
 
-    await page.getByRole('button', { name: /Remove No RSVP Event/ }).click()
+    // Watcher events are removed directly without dialog
+    await page.getByRole('button', { name: /Remove Watcher Event/ }).click()
 
-    await expect(page.getByText('This event will be removed from your list.')).toBeVisible()
-    await expect(page.getByText('attendance will be cancelled')).not.toBeVisible()
+    // Watcher removal is immediate — event disappears
+    await expect(page.getByText('Watcher Event')).not.toBeVisible()
   })
 
   test('confirm removal → DELETE called → event removed from list', async ({ page, network }) => {

frontend/e2e/home-events.spec.ts

@@ -93,19 +93,30 @@ test.describe('US4: Past Events Appear Faded', () => {
 })
 
 test.describe('US3: Remove Event from List', () => {
-  test('delete icon triggers confirmation dialog, confirm removes event', async ({ page }) => {
+  test('delete icon triggers confirmation dialog, confirm removes event', async ({
+    page,
+    network,
+  }) => {
     await page.addInitScript(seedEvents([futureEvent1, futureEvent2]))
+
+    const { http, HttpResponse } = await import('msw')
+    network.use(
+      http.patch('*/api/events/:token', () => {
+        return new HttpResponse(null, { status: 204 })
+      }),
+    )
+
     await page.goto('/')
 
     // Both events visible
     await expect(page.getByText('Summer BBQ')).toBeVisible()
     await expect(page.getByText('Team Meeting')).toBeVisible()
 
-    // Click delete on Summer BBQ
+    // Click delete on Summer BBQ (organizer event)
     await page.getByRole('button', { name: /Remove Summer BBQ/ }).click()
 
-    // Confirmation dialog appears
-    await expect(page.getByText('Remove event?')).toBeVisible()
+    // Confirmation dialog appears (organizer event shows "Cancel event?")
+    await expect(page.getByText('Cancel event?')).toBeVisible()
 
     // Confirm removal
     await page.getByRole('button', { name: 'Remove', exact: true }).click()
@@ -120,13 +131,13 @@ test.describe('US3: Remove Event from List', () => {
     await page.goto('/')
 
     await page.getByRole('button', { name: /Remove Summer BBQ/ }).click()
-    await expect(page.getByText('Remove event?')).toBeVisible()
+    await expect(page.getByText('Cancel event?')).toBeVisible()
 
     // Cancel
     await page.getByRole('button', { name: 'Cancel' }).click()
 
     // Dialog gone, event still there
-    await expect(page.getByText('Remove event?')).not.toBeVisible()
+    await expect(page.getByText('Cancel event?')).not.toBeVisible()
     await expect(page.getByText('Summer BBQ')).toBeVisible()
   })
 })

frontend/src/components/EventList.vue

@@ -27,7 +27,7 @@
     </section>
     <ConfirmDialog
       :open="!!pendingDeleteToken"
-      title="Remove event?"
+      :title="deleteDialogTitle"
       :message="deleteDialogMessage"
       confirm-label="Remove"
       cancel-label="Cancel"
@@ -49,13 +49,26 @@ import DateSubheader from './DateSubheader.vue'
 import ConfirmDialog from './ConfirmDialog.vue'
 import type { StoredEvent } from '../composables/useEventStorage'
 
-const { getStoredEvents, getRsvp, removeEvent } = useEventStorage()
+const { getStoredEvents, getRsvp, getOrganizerToken, removeEvent } = useEventStorage()
 
 const pendingDeleteToken = ref<string | null>(null)
 const deleteError = ref('')
 
+const pendingDeleteRole = computed(() => {
+  if (!pendingDeleteToken.value) return null
+  const event = getStoredEvents().find((e) => e.eventToken === pendingDeleteToken.value)
+  return event ? getRole(event) : null
+})
+
+const deleteDialogTitle = computed(() => {
+  return pendingDeleteRole.value === 'organizer' ? 'Cancel event?' : 'Remove event?'
+})
+
 const deleteDialogMessage = computed(() => {
   if (!pendingDeleteToken.value) return ''
+  if (pendingDeleteRole.value === 'organizer') {
+    return 'This will permanently cancel the event for all attendees.'
+  }
   const rsvp = getRsvp(pendingDeleteToken.value)
   if (rsvp) {
     return 'This event will be removed from your list and your attendance will be cancelled.'
@@ -77,6 +90,32 @@ async function confirmDelete() {
   if (!pendingDeleteToken.value) return
 
   const eventToken = pendingDeleteToken.value
+  const organizerToken = getOrganizerToken(eventToken)
+
+  if (organizerToken) {
+    try {
+      const { response } = await api.PATCH('/events/{eventToken}', {
+        params: {
+          path: { eventToken },
+          query: { organizerToken },
+        },
+        body: { cancelled: true },
+      })
+
+      if (response.status !== 204 && response.status !== 409 && response.status !== 404) {
+        deleteError.value = 'Could not cancel event. Please try again.'
+        return
+      }
+    } catch {
+      deleteError.value = 'Could not cancel event. Please try again.'
+      return
+    }
+
+    removeEvent(eventToken)
+    pendingDeleteToken.value = null
+    return
+  }
+
   const rsvp = getRsvp(eventToken)
 
   if (rsvp) {

frontend/src/components/__tests__/EventList.spec.ts

@@ -1,8 +1,15 @@
 import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
-import { mount } from '@vue/test-utils'
+import { mount, flushPromises } from '@vue/test-utils'
 import { createRouter, createMemoryHistory } from 'vue-router'
 import EventList from '../EventList.vue'
 
+vi.mock('../../api/client', () => ({
+  api: {
+    PATCH: vi.fn(),
+    DELETE: vi.fn(),
+  },
+}))
+
 const router = createRouter({
   history: createMemoryHistory(),
   routes: [
@@ -24,6 +31,8 @@ const mockEvents = [
   { eventToken: 'rsvp-1', title: 'Attending Event', dateTime: '2026-03-11T20:00:00', rsvpToken: 'rsvp-token', rsvpName: 'Max' },
 ]
 
+const removeEventMock = vi.fn()
+
 vi.mock('../../composables/useEventStorage', () => ({
   isValidStoredEvent: (e: unknown) => {
     if (typeof e !== 'object' || e === null) return false
@@ -41,7 +50,14 @@ vi.mock('../../composables/useEventStorage', () => ({
       }
       return undefined
     },
-    removeEvent: vi.fn(),
+    getOrganizerToken: (token: string) => {
+      const evt = mockEvents.find((e) => e.eventToken === token)
+      if (evt && 'organizerToken' in evt) {
+        return (evt as Record<string, unknown>).organizerToken as string
+      }
+      return undefined
+    },
+    removeEvent: removeEventMock,
   }),
 }))
 
@@ -60,7 +76,10 @@ vi.mock('../../composables/useRelativeTime', () => ({
 
 function mountList() {
   return mount(EventList, {
-    global: { plugins: [router] },
+    global: {
+      plugins: [router],
+      stubs: { Teleport: true },
+    },
   })
 }
 
@@ -170,3 +189,118 @@ describe('EventList', () => {
     expect(badge.text()).toBe('Attending')
   })
 })
+
+describe('EventList — Organizer Cancel (US1)', () => {
+  beforeEach(() => {
+    vi.useFakeTimers()
+    vi.setSystemTime(NOW)
+  })
+
+  afterEach(() => {
+    vi.useRealTimers()
+  })
+
+  it('T005: confirmDelete calls PATCH cancel-event API when role is organizer', async () => {
+    const { api } = await import('../../api/client')
+    const patchMock = vi.mocked(api.PATCH)
+    patchMock.mockResolvedValue({ response: { status: 204 } } as never)
+
+    const wrapper = mountList()
+
+    // Find the organizer event delete button and click it
+    const orgCard = wrapper.findAll('.event-card').find((c) => c.text().includes('Organized Event'))
+    expect(orgCard).toBeTruthy()
+    await orgCard!.find('.event-card__delete').trigger('click')
+
+    // Confirm the dialog
+    const confirmBtn = wrapper.find('.confirm-dialog__btn--confirm')
+    await confirmBtn.trigger('click')
+    await flushPromises()
+
+    expect(patchMock).toHaveBeenCalledWith(
+      '/events/{eventToken}',
+      expect.objectContaining({
+        params: expect.objectContaining({
+          path: { eventToken: 'org-1' },
+          query: { organizerToken: 'org-token' },
+        }),
+        body: { cancelled: true },
+      }),
+    )
+  })
+
+  it('T006: confirmDelete treats 409 response as success (removes event from list)', async () => {
+    const { api } = await import('../../api/client')
+    const patchMock = vi.mocked(api.PATCH)
+    patchMock.mockResolvedValue({ response: { status: 409 } } as never)
+
+    removeEventMock.mockClear()
+
+    const wrapper = mountList()
+
+    const orgCard = wrapper.findAll('.event-card').find((c) => c.text().includes('Organized Event'))
+    await orgCard!.find('.event-card__delete').trigger('click')
+
+    const confirmBtn = wrapper.find('.confirm-dialog__btn--confirm')
+    await confirmBtn.trigger('click')
+    await flushPromises()
+
+    // 409 should be treated as success — removeEvent should have been called
+    expect(removeEventMock).toHaveBeenCalledWith('org-1')
+  })
+
+  it('T006b: confirmDelete treats 404 response as success (removes event from list)', async () => {
+    const { api } = await import('../../api/client')
+    const patchMock = vi.mocked(api.PATCH)
+    patchMock.mockResolvedValue({ response: { status: 404 } } as never)
+
+    removeEventMock.mockClear()
+
+    const wrapper = mountList()
+
+    const orgCard = wrapper.findAll('.event-card').find((c) => c.text().includes('Organized Event'))
+    await orgCard!.find('.event-card__delete').trigger('click')
+
+    const confirmBtn = wrapper.find('.confirm-dialog__btn--confirm')
+    await confirmBtn.trigger('click')
+    await flushPromises()
+
+    expect(removeEventMock).toHaveBeenCalledWith('org-1')
+  })
+})
+
+describe('EventList — Dialog Differentiation (US2)', () => {
+  beforeEach(() => {
+    vi.useFakeTimers()
+    vi.setSystemTime(NOW)
+  })
+
+  afterEach(() => {
+    vi.useRealTimers()
+  })
+
+  it('T013: deleteDialogTitle returns organizer-specific text when role is organizer', async () => {
+    const wrapper = mountList()
+
+    // Click delete on organizer event
+    const orgCard = wrapper.findAll('.event-card').find((c) => c.text().includes('Organized Event'))
+    await orgCard!.find('.event-card__delete').trigger('click')
+
+    const dialogTitle = wrapper.find('.confirm-dialog__title')
+    expect(dialogTitle.text()).toBe('Cancel event?')
+  })
+
+  it('T014: deleteDialogMessage returns existing attendee text when role is attendee', async () => {
+    const wrapper = mountList()
+
+    // Click delete on attendee event
+    const attCard = wrapper.findAll('.event-card').find((c) => c.text().includes('Attending Event'))
+    await attCard!.find('.event-card__delete').trigger('click')
+
+    const dialogTitle = wrapper.find('.confirm-dialog__title')
+    expect(dialogTitle.text()).toBe('Remove event?')
+
+    const dialogMsg = wrapper.find('.confirm-dialog__message')
+    expect(dialogMsg.text()).toContain('attendance will be cancelled')
+  })
+})