import { describe, it, expect, beforeEach, vi } from 'vitest'
import { db, saveSession, clearSession } from './db.js'

// Must import api after fake-indexeddb is initialized (via test-setup.js)
const { apiFetch, apiJSON, api } = await import('./api.js')

beforeEach(async () => {
  await Promise.all(db.tables.map(t => t.clear()))
  vi.restoreAllMocks()
})

function mockFetch(body = {}, status = 200) {
  const fn = vi.fn(() =>
    Promise.resolve({
      ok: status >= 200 && status < 300,
      status,
      statusText: 'OK',
      json: () => Promise.resolve(body),
      text: () => Promise.resolve(JSON.stringify(body)),
    })
  )
  globalThis.fetch = fn
  return fn
}

describe('apiFetch', () => {
  it('adds Authorization header when session exists', async () => {
    await saveSession('mytoken', { id: 1 })
    const f = mockFetch()
    await apiFetch('/api/test')
    expect(f).toHaveBeenCalledTimes(1)
    const [, opts] = f.mock.calls[0]
    expect(opts.headers['Authorization']).toBe('Bearer mytoken')
  })

  it('omits Authorization when no session', async () => {
    const f = mockFetch()
    await apiFetch('/api/test')
    const [, opts] = f.mock.calls[0]
    expect(opts.headers['Authorization']).toBeUndefined()
  })

  it('clears session on 401', async () => {
    await saveSession('expired', { id: 1 })
    mockFetch({}, 401)
    await expect(apiFetch('/api/test')).rejects.toThrow('unauthorized')
    expect(await db.session.get(1)).toBeUndefined()
  })
})

describe('apiJSON', () => {
  it('parses JSON response', async () => {
    mockFetch({ name: 'Titania' })
    const result = await apiJSON('/api/test')
    expect(result.name).toBe('Titania')
  })

  it('throws on non-OK response', async () => {
    mockFetch({ error: 'not found' }, 404)
    await expect(apiJSON('/api/test')).rejects.toThrow('not found')
  })
})

describe('api methods', () => {
  it('login calls correct endpoint', async () => {
    const f = mockFetch({ token: 'tok', user: { id: 1 } })
    await api.login('admin', 'pass')
    const [url, opts] = f.mock.calls[0]
    expect(url).toBe('/api/login')
    expect(opts.method).toBe('POST')
    expect(JSON.parse(opts.body)).toEqual({ username: 'admin', password: 'pass' })
  })

  it('attendees.list calls correct endpoint', async () => {
    const f = mockFetch({ attendees: [] })
    await api.attendees.list({ search: 'test' })
    expect(f.mock.calls[0][0]).toBe('/api/attendees?search=test')
  })

  it('attendees.delete uses DELETE method', async () => {
    const f = mockFetch({}, 204)
    await api.attendees.delete(5)
    expect(f.mock.calls[0][0]).toBe('/api/attendees/5')
    expect(f.mock.calls[0][1].method).toBe('DELETE')
  })

  it('sync.pull passes since param', async () => {
    const f = mockFetch({ server_time: '2026-01-01', attendees: [] })
    await api.sync.pull('2026-01-01T00:00:00Z')
    expect(f.mock.calls[0][0]).toContain('since=')
  })

  it('sync.pull omits since when empty', async () => {
    const f = mockFetch({ server_time: '2026-01-01', attendees: [] })
    await api.sync.pull('')
    expect(f.mock.calls[0][0]).toBe('/api/sync/pull')
  })
})