/**
 * Broker: syncCalendar event upsert + all-day handling
 *
 * Tests syncCalendar in src/broker/sync.ts.
 * Key behaviors verified (D-13, T-03-05):
 *   - All-day events: dtstart_date (DATE) set, dtstart_utc NULL, allDay=true
 *   - Timed events: dtstart_utc (TIMESTAMP UTC) set, dtstart_date NULL, allDay=false
 *   - UID used as idempotency key: second sync of same UID is an upsert, not duplicate
 *   - Raw VEVENT blob stored verbatim
 *   - Calendar ctag/syncToken updated after sync
 */

import { describe, it, expect, vi, beforeEach } from 'vitest'
import {
  SAMPLE_VEVENT_TIMED,
  SAMPLE_VEVENT_ALLDAY,
} from '../helpers/db.js'

// Mock the db singleton at module level (Vitest hoisting)
vi.mock('../../src/db/client.js', () => {
  const onDuplicateKeyUpdate = vi.fn().mockResolvedValue([{ id: 1 }])
  const values = vi.fn().mockReturnValue({ onDuplicateKeyUpdate })
  const insert = vi.fn().mockReturnValue({ values })
  return {
    db: { insert },
  }
})

describe('syncCalendar', () => {
  beforeEach(() => {
    vi.clearAllMocks()
  })

  it('stores all-day events with dtstart_date (DATE) and dtstart_utc=NULL', async () => {
    const { db } = await import('../../src/db/client.js')
    const { syncCalendar } = await import('../../src/broker/sync.js')

    const mockClient = {
      fetchCalendarObjects: vi.fn().mockResolvedValue([
        { data: SAMPLE_VEVENT_ALLDAY, etag: '"etag-allday"', url: '/cal/allday.ics' },
      ]),
    }
    const mockDavCal = {
      url: 'https://caldav.fastmail.com/dav/calendars/user/test@fm.com/Default/',
      displayName: 'Test Calendar',
      ctag: 'ctag-v1',
      syncToken: null,
    }

    await syncCalendar(mockClient as never, mockDavCal as never, 1)

    const insertMock = vi.mocked(db.insert)
    // Should have been called at least twice: once for calendars, once for calendarEvents
    expect(insertMock).toHaveBeenCalledTimes(2)

    // The second insert call is for calendarEvents
    const eventValuesArg = vi.mocked(insertMock).mock.results[1].value.values.mock.calls[0][0]
    expect(eventValuesArg.allDay).toBe(true)
    expect(eventValuesArg.dtstartDate).toBeTruthy() // YYYY-MM-DD string
    expect(eventValuesArg.dtstartUtc).toBeNull()
  })

  it('stores timed events with dtstart_utc (TIMESTAMP) and dtstart_date=NULL', async () => {
    const { db } = await import('../../src/db/client.js')
    const { syncCalendar } = await import('../../src/broker/sync.js')

    const mockClient = {
      fetchCalendarObjects: vi.fn().mockResolvedValue([
        { data: SAMPLE_VEVENT_TIMED, etag: '"etag-timed"', url: '/cal/timed.ics' },
      ]),
    }
    const mockDavCal = {
      url: 'https://caldav.fastmail.com/dav/calendars/user/test@fm.com/Default/',
      displayName: 'Test Calendar',
      ctag: 'ctag-v1',
      syncToken: null,
    }

    await syncCalendar(mockClient as never, mockDavCal as never, 1)

    const insertMock = vi.mocked(db.insert)
    expect(insertMock).toHaveBeenCalledTimes(2)

    const eventValuesArg = vi.mocked(insertMock).mock.results[1].value.values.mock.calls[0][0]
    expect(eventValuesArg.allDay).toBe(false)
    expect(eventValuesArg.dtstartUtc).toBeInstanceOf(Date)
    expect(eventValuesArg.dtstartDate).toBeNull()
  })

  it('sets allDay=true for all-day events, allDay=false for timed', async () => {
    const { db } = await import('../../src/db/client.js')
    const { syncCalendar } = await import('../../src/broker/sync.js')

    const mockClient = {
      fetchCalendarObjects: vi.fn().mockResolvedValue([
        { data: SAMPLE_VEVENT_ALLDAY, etag: '"allday"', url: '/allday.ics' },
      ]),
    }
    const mockDavCal = {
      url: 'https://caldav.fastmail.com/dav/calendars/user/test@fm.com/Test/',
      displayName: 'Test',
      ctag: null,
      syncToken: null,
    }

    await syncCalendar(mockClient as never, mockDavCal as never, 1)
    const insertMock = vi.mocked(db.insert)
    const eventArg = vi.mocked(insertMock).mock.results[1].value.values.mock.calls[0][0]
    expect(eventArg.allDay).toBe(true)
  })

  it('upserts on duplicate UID within the same calendar (onDuplicateKeyUpdate called)', async () => {
    const { db } = await import('../../src/db/client.js')
    const { syncCalendar } = await import('../../src/broker/sync.js')

    const mockClient = {
      fetchCalendarObjects: vi.fn().mockResolvedValue([
        { data: SAMPLE_VEVENT_TIMED, etag: '"etag1"', url: '/timed.ics' },
      ]),
    }
    const mockDavCal = {
      url: 'https://caldav.fastmail.com/dav/calendars/user/test@fm.com/Default/',
      displayName: 'Test',
      ctag: 'v2',
      syncToken: null,
    }

    await syncCalendar(mockClient as never, mockDavCal as never, 1)

    // Both calendar insert and event insert must use onDuplicateKeyUpdate
    const insertMock = vi.mocked(db.insert)
    const calOnDup = vi.mocked(insertMock).mock.results[0].value.values.mock.results[0].value.onDuplicateKeyUpdate
    const evtOnDup = vi.mocked(insertMock).mock.results[1].value.values.mock.results[0].value.onDuplicateKeyUpdate
    expect(calOnDup).toHaveBeenCalledTimes(1)
    expect(evtOnDup).toHaveBeenCalledTimes(1)
  })

  it('stores the raw VEVENT blob in rawVevent column', async () => {
    const { db } = await import('../../src/db/client.js')
    const { syncCalendar } = await import('../../src/broker/sync.js')

    const mockClient = {
      fetchCalendarObjects: vi.fn().mockResolvedValue([
        { data: SAMPLE_VEVENT_TIMED, etag: '"etag"', url: '/timed.ics' },
      ]),
    }
    const mockDavCal = {
      url: 'https://caldav.fastmail.com/dav/calendars/user/test@fm.com/Default/',
      displayName: 'Test',
      ctag: 'v1',
      syncToken: null,
    }

    await syncCalendar(mockClient as never, mockDavCal as never, 1)
    const insertMock = vi.mocked(db.insert)
    const eventArg = vi.mocked(insertMock).mock.results[1].value.values.mock.calls[0][0]
    expect(eventArg.rawVevent).toBe(SAMPLE_VEVENT_TIMED)
  })

  it('updates the calendar ctag/syncToken after a successful sync', async () => {
    const { db } = await import('../../src/db/client.js')
    const { syncCalendar } = await import('../../src/broker/sync.js')

    const mockClient = {
      fetchCalendarObjects: vi.fn().mockResolvedValue([]),
    }
    const mockDavCal = {
      url: 'https://caldav.fastmail.com/dav/calendars/user/test@fm.com/Default/',
      displayName: 'Test Calendar',
      ctag: 'new-ctag-123',
      syncToken: 'sync-token-abc',
    }

    await syncCalendar(mockClient as never, mockDavCal as never, 1)

    const insertMock = vi.mocked(db.insert)
    const calValuesArg = vi.mocked(insertMock).mock.results[0].value.values.mock.calls[0][0]
    expect(calValuesArg.ctag).toBe('new-ctag-123')
    expect(calValuesArg.syncToken).toBe('sync-token-abc')
  })
})