/**
 * 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')
  })
})

/**
 * RED test scaffold: write endpoints + sync-status + writable-calendars (CAL-04/05/06, D-03, D-05, D-08, D-09)
 *
 * These tests extend the existing GET /api/events suite.
 * They FAIL (RED) because the route handlers for write operations do not exist yet.
 * They will turn GREEN in Plan 03-03 when the implementation is added.
 *
 * Note: The vi.mock calls for @hono/oidc-auth and db are hoisted above — they apply to all
 * describe blocks in this file including these new ones.
 */

// Additional Drizzle mock helpers needed for write operations.
// The insert mock needs to support chaining: db.insert(table).values({...}) → Promise
let mockInsertValues: ReturnType<typeof vi.fn>
let mockInsert: ReturnType<typeof vi.fn>

// Update mock for outbox status reads
let mockOutboxRow: unknown = null
const mockOutboxWhere = vi.fn().mockImplementation(() => Promise.resolve(mockOutboxRow ? [mockOutboxRow] : []))
const mockOutboxFrom = vi.fn().mockReturnValue({ where: mockOutboxWhere })

// Calendar mock for writable-calendars
let mockCalendarRows: unknown[] = []
const mockCalsWhere = vi.fn().mockImplementation(() => Promise.resolve(mockCalendarRows))
const mockCalsFrom = vi.fn().mockReturnValue({ where: mockCalsWhere })

beforeEach(() => {
  mockInsertValues = vi.fn().mockResolvedValue([{ insertId: 1 }])
  mockInsert = vi.fn().mockReturnValue({ values: mockInsertValues })
  mockOutboxRow = null
  mockCalendarRows = []
})

describe('POST /api/events/create', () => {
  it('returns 202 and inserts a pending outbox row for a valid create request', async () => {
    // This test fails RED — route does not exist yet
    const { app } = await import('../../src/index.js')
    const res = await app.request('/api/events/create', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        summary: 'New event',
        allDay: false,
        dtstart: '2026-06-15T10:00:00Z',
        dtend: '2026-06-15T11:00:00Z',
        calendarUrl: 'https://caldav.fastmail.com/dav/calendars/user/test@fm.com/Default/',
      }),
    })
    // RED: 404 or 405 expected because route is not registered yet
    expect(res.status).toBe(202)
  })

  it('returns 400 for missing required fields', async () => {
    const { app } = await import('../../src/index.js')
    const res = await app.request('/api/events/create', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ summary: 'Missing dates' }),
    })
    // RED: 404 expected because route is not registered yet
    expect(res.status).toBe(400)
  })

  it('returns 403 when writing to a calendar not owned by the user (D-03 / V4)', async () => {
    const { app } = await import('../../src/index.js')
    const res = await app.request('/api/events/create', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        summary: 'Unauthorized write',
        allDay: false,
        dtstart: '2026-06-15T10:00:00Z',
        dtend: '2026-06-15T11:00:00Z',
        calendarUrl: 'https://caldav.fastmail.com/dav/calendars/user/other@fm.com/Personal/',
      }),
    })
    // RED: route not registered yet; a real implementation returns 403
    expect(res.status).toBe(403)
  })
})

describe('PATCH /api/events/:uid/edit', () => {
  it('returns 202 and inserts an outbox row with etag for a valid edit request', async () => {
    const { app } = await import('../../src/index.js')
    const res = await app.request('/api/events/uid-001%40familysync/edit', {
      method: 'PATCH',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        summary: 'Updated title',
        allDay: false,
        dtstart: '2026-06-15T10:00:00Z',
        dtend: '2026-06-15T11:00:00Z',
        calendarUrl: 'https://caldav.fastmail.com/dav/calendars/user/test@fm.com/Default/',
      }),
    })
    // RED: route not registered yet
    expect(res.status).toBe(202)
  })
})

describe('DELETE /api/events/:uid', () => {
  it('returns 202 and inserts a delete outbox row', async () => {
    const { app } = await import('../../src/index.js')
    const res = await app.request('/api/events/uid-001%40familysync', {
      method: 'DELETE',
    })
    // RED: route not registered yet
    expect(res.status).toBe(202)
  })
})

describe('GET /api/events/sync-status', () => {
  it('returns the outbox status for a given uid', async () => {
    const { app } = await import('../../src/index.js')
    const res = await app.request('/api/events/sync-status?uid=uid-001%40familysync')
    // RED: route not registered yet
    expect(res.status).toBe(200)
    const body = await res.json() as { uid: string; status: string }
    expect(body).toHaveProperty('uid')
    expect(body).toHaveProperty('status')
    expect(['pending', 'done', 'failed', 'dead']).toContain(body.status)
  })
})

describe('GET /api/events/writable-calendars', () => {
  it('returns calendars writable by the current user (own personal + shared isShared=1)', async () => {
    const { app } = await import('../../src/index.js')
    const res = await app.request('/api/events/writable-calendars')
    // RED: route not registered yet
    expect(res.status).toBe(200)
    const body = await res.json() as { calendars: unknown[] }
    expect(body).toHaveProperty('calendars')
    expect(Array.isArray(body.calendars)).toBe(true)
  })

  it('does NOT return another member\'s personal calendar (D-03 / V4 access control)', async () => {
    // Implementation must filter to: userId = currentUser.id OR isShared = true
    // Other member's personal (different userId, isShared=false) must be absent.
    const { app } = await import('../../src/index.js')
    const res = await app.request('/api/events/writable-calendars')
    // RED: route not registered yet
    expect(res.status).toBe(200)
    const body = await res.json() as { calendars: Array<{ userId?: number; isShared?: boolean }> }
    // When implemented: no calendar with userId !== currentUser.id AND isShared === false should appear
    for (const cal of body.calendars) {
      const isOwnedByUser = cal.userId !== undefined
      const isShared = cal.isShared === true
      expect(isOwnedByUser || isShared).toBe(true)
    }
  })
})