import { afterEach, describe, expect, it, vi } from 'vitest'
import { ApiClient } from './client'

function response(body: unknown, status = 200, headers: Record<string, string> = {}): Response {
  return new Response(JSON.stringify(body), {
    status,
    headers: { 'Content-Type': 'application/json', ...headers },
  })
}

afterEach(() => {
  vi.unstubAllGlobals()
})

describe('ApiClient Egregoros compatibility', () => {
  it('refreshes an expired bearer token once and retries the request', async () => {
    const refreshToken = vi.fn().mockResolvedValue('fresh-token')
    const fetchMock = vi
      .fn()
      .mockResolvedValueOnce(response({ error: 'Invalid or expired token' }, 401))
      .mockResolvedValueOnce(response({ id: 'alice' }))
    vi.stubGlobal('fetch', fetchMock)
    const client = new ApiClient('egregoros.example', 'expired-token', refreshToken)

    await expect(client.get('/api/v1/accounts/verify_credentials')).resolves.toEqual({
      id: 'alice',
    })

    expect(refreshToken).toHaveBeenCalledOnce()
    expect((fetchMock.mock.calls[0][1].headers as Headers).get('Authorization')).toBe(
      'Bearer expired-token',
    )
    expect((fetchMock.mock.calls[1][1].headers as Headers).get('Authorization')).toBe(
      'Bearer fresh-token',
    )
  })

  it('does not invent a next page when the server supplied only a prev link', async () => {
    vi.stubGlobal(
      'fetch',
      vi.fn().mockResolvedValue(
        response(
          [{ id: 'newest' }, { id: 'oldest' }],
          200,
          {
            Link: '<https://egregoros.example/api/v1/timelines/public?since_id=newest>; rel="prev"',
          },
        ),
      ),
    )

    const page = await new ApiClient('egregoros.example').page<{ id: string }>(
      '/api/v1/timelines/public',
      { limit: 20 },
    )

    expect(page.links.sinceId).toBe('newest')
    expect(page.links.maxId).toBeUndefined()
  })

  it('derives a next cursor only for a full page when Link was stripped entirely', async () => {
    vi.stubGlobal(
      'fetch',
      vi.fn().mockResolvedValue(response([{ id: 'newest' }, { id: 'oldest' }])),
    )

    const page = await new ApiClient('egregoros.example').page<{ id: string }>(
      '/api/v1/timelines/public',
      { limit: 2 },
    )

    expect(page.links.maxId).toBe('oldest')
  })
})