/**
 * Tests for GET /api/events — windowed endpoint.
 *
 * Contracts:
 *  1. Missing/malformed start or end params → 400 (input validation guard)
 *  2. Window wider than 90 days → 400 (DoS cap)
 *  3. Valid window returns { occurrences: [] } when DB is empty
 *  4. Recurring timed master (dtstartUtc years before window, hasRrule=1) yields occurrences
 *     inside the requested window via expandOccurrences.
 *  5. Recurring all-day master (dtstartUtc NULL, dtstartDate years before window, hasRrule=1)
 *     is NOT filtered out — its occurrence in the window is returned.
 */

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

// Mock @hono/oidc-auth so tests do not need a live Authelia instance.
// The mock makes oidcAuthMiddleware a no-op passthrough.
vi.mock('@hono/oidc-auth', () => ({
  oidcAuthMiddleware: () => async (_c: unknown, next: () => Promise<void>) => next(),
  processOAuthCallback: () => async (c: { json: (v: unknown) => unknown }) => c.json({ ok: true }),
  getAuth: () => null,
}))

// Configurable mock for the DB — tests can set mockDbRows before calling the route.
let mockDbRows: unknown[] = []
const mockWhereFn = vi.fn().mockImplementation(() => Promise.resolve(mockDbRows))
const mockInnerJoin2Fn = vi.fn().mockReturnValue({ where: mockWhereFn })
const mockInnerJoin1Fn = vi.fn().mockReturnValue({ innerJoin: mockInnerJoin2Fn })
const mockFromFn = vi.fn().mockReturnValue({ innerJoin: mockInnerJoin1Fn })
const mockSelectFn = vi.fn().mockReturnValue({ from: mockFromFn })

vi.mock('../../src/db/client.js', () => ({
  db: {
    select: mockSelectFn,
  },
}))

describe('GET /api/events', () => {
  beforeEach(() => {
    // Reset to empty result set before each test
    mockDbRows = []
    vi.clearAllMocks()
    // Restore mock implementations after clearAllMocks
    mockWhereFn.mockImplementation(() => Promise.resolve(mockDbRows))
    mockInnerJoin2Fn.mockReturnValue({ where: mockWhereFn })
    mockInnerJoin1Fn.mockReturnValue({ innerJoin: mockInnerJoin2Fn })
    mockFromFn.mockReturnValue({ innerJoin: mockInnerJoin1Fn })
    mockSelectFn.mockReturnValue({ from: mockFromFn })
  })

  it('returns 400 when start param is missing', async () => {
    const { app } = await import('../../src/index.js')
    const res = await app.request('/api/events?end=2026-07-01')
    expect(res.status).toBe(400)
  })

  it('returns 400 when end param is missing', async () => {
    const { app } = await import('../../src/index.js')
    const res = await app.request('/api/events?start=2026-06-01')
    expect(res.status).toBe(400)
  })

  it('returns 400 when start param is malformed (not YYYY-MM-DD)', async () => {
    const { app } = await import('../../src/index.js')
    const res = await app.request('/api/events?start=not-a-date&end=2026-07-01')
    expect(res.status).toBe(400)
  })

  it('returns occurrences with color, isShared, and ownerName fields for valid window', async () => {
    const { app } = await import('../../src/index.js')
    const res = await app.request('/api/events?start=2026-06-01&end=2026-07-01')
    expect(res.status).toBe(200)
    const body = await res.json() as { occurrences: Array<{ color: string; isShared: boolean; ownerName: string | null }> }
    expect(body).toHaveProperty('occurrences')
    expect(Array.isArray(body.occurrences)).toBe(true)
    // Each occurrence must carry color + isShared + ownerName (may be empty array if DB is mocked empty)
    for (const occ of body.occurrences) {
      expect(occ).toHaveProperty('color')
      expect(typeof occ.color).toBe('string')
      expect(occ).toHaveProperty('isShared')
      expect(typeof occ.isShared).toBe('boolean')
      expect(occ).toHaveProperty('ownerName')
      // ownerName is string | null — both are valid
      expect(occ.ownerName === null || typeof occ.ownerName === 'string').toBe(true)
    }
  })

  it('returns occurrences for a timed recurring master whose dtstartUtc is years before the window', async () => {
    // Simulates a weekly meeting created in 2024 (dtstartUtc=2024-01-01) being queried for
    // a 2026 window. The SQL pre-filter must select it (hasRrule=1 AND dtstartUtc < windowEnd)
    // and expandOccurrences must return the in-window occurrences.
    // SAMPLE_VEVENT_RECURRING_TIMED has DTSTART:20240101T100000Z RRULE:FREQ=WEEKLY;BYDAY=MO.
    // In the 2026-06-01..2026-07-01 window there are 4 Mondays.
    mockDbRows = [
      {
        rawVevent: SAMPLE_VEVENT_RECURRING_TIMED,
        calendarId: 1,
        calendarName: 'Work',
        isShared: false,
        userId: 1,
        userColor: '#4A90D9',
        ownerName: 'Alice',
      },
    ]

    const { app } = await import('../../src/index.js')
    const res = await app.request('/api/events?start=2026-06-01&end=2026-07-01')
    expect(res.status).toBe(200)

    const body = await res.json() as { occurrences: Array<{ uid: string; start: string; allDay: boolean; ownerName: string | null }> }
    expect(body.occurrences.length).toBeGreaterThan(0)

    // All returned occurrences must be inside [2026-06-01, 2026-07-01)
    for (const occ of body.occurrences) {
      expect(occ.uid).toBe('test-recurring-timed-001@familysync')
      expect(occ.allDay).toBe(false)
      // start must be within the window
      const startDate = occ.start.slice(0, 10) // 'YYYY-MM-DD'
      expect(startDate >= '2026-06-01').toBe(true)
      expect(startDate < '2026-07-01').toBe(true)
      // ownerName from the mock row must be threaded through
      expect(occ.ownerName).toBe('Alice')
    }
  })

  it('returns occurrence for an all-day recurring master whose dtstartDate is years before the window (dtstartUtc NULL)', async () => {
    // Simulates an annual birthday created in 2024 (DTSTART;VALUE=DATE:20240615, no dtstartUtc).
    // The SQL pre-filter MUST NOT exclude it on dtstartUtc IS NULL — the fix adds
    //   OR dtstartDate < end
    // so this row is selected and expandOccurrences returns the 2026-06-15 occurrence.
    // SAMPLE_VEVENT_RECURRING_ALLDAY has DTSTART;VALUE=DATE:20240615 RRULE:FREQ=YEARLY.
    mockDbRows = [
      {
        rawVevent: SAMPLE_VEVENT_RECURRING_ALLDAY,
        calendarId: 2,
        calendarName: 'Personal',
        isShared: false,
        userId: 1,
        userColor: '#50C878',
        ownerName: 'Bob',
      },
    ]

    const { app } = await import('../../src/index.js')
    const res = await app.request('/api/events?start=2026-06-01&end=2026-07-01')
    expect(res.status).toBe(200)

    const body = await res.json() as { occurrences: Array<{ uid: string; start: string; allDay: boolean }> }
    // There must be exactly one annual occurrence (June 15) in the window
    expect(body.occurrences.length).toBe(1)

    const occ = body.occurrences[0]
    expect(occ.uid).toBe('test-recurring-allday-001@familysync')
    expect(occ.allDay).toBe(true)
    expect(occ.start).toBe('2026-06-15')
  })
})