import { afterEach, beforeEach, describe, expect, it } from 'vitest'
import { runSplice } from '../../server/utils/splice'
import { fakeGithubFetch, GitFixture, localReceivePackFactory } from '../utils/git-wire'

describe('runSplice thin-pack negotiation (knot already holds the base)', () => {
  let fx: GitFixture
  let realFetch: typeof globalThis.fetch

  beforeEach(() => {
    fx = new GitFixture()
    realFetch = globalThis.fetch
  })

  afterEach(() => {
    globalThis.fetch = realFetch
    fx.cleanup()
  })

  it('pushes an incremental update where the knot advertises the base commit as a have', async () => {
    // GitHub side: two commits on main (base -> head).
    const gh = fx.initBare('gh.git')
    const work = fx.initWork('work')
    const base = fx.commit(work, 'a.txt', 'hello')
    fx.pushTo(work, gh, 'HEAD:refs/heads/main')
    const head = fx.commit(work, 'b.txt', 'world')
    fx.pushTo(work, gh, 'HEAD:refs/heads/main')

    // Knot side: already has `base` on main (the state after the first sync).
    const knot = fx.initBare('knot.git')
    fx.pushTo(work, knot, `${base}:refs/heads/main`)

    globalThis.fetch = fakeGithubFetch(new Map([['owner/repo', gh]])) as unknown as typeof globalThis.fetch

    const result = await runSplice(localReceivePackFactory(knot), {
      repoFullName: 'owner/repo',
      ref: 'refs/heads/main',
      want: head,
      token: 't',
    })

    expect(result.status).toBe('synced')
    expect(fx.revParse(knot, 'refs/heads/main')).toBe(head)
  })
})