import { describe, it, expect } from 'vitest'
import { buildTestApp, setupAdmin, loginAs, auth } from './helpers.js'

function albumPage(count: number, offset: number) {
  return {
    'subsonic-response': {
      status: 'ok',
      albumList2: {
        album: Array.from({ length: count }, (_, i) => ({
          id: offset + i + 1,
          name: `Album ${offset + i + 1}`,
          artist: `Artist ${Math.floor((offset + i) / 10)}`,
        })),
      },
    },
  }
}

function subsonicStub(): typeof fetch {
  return (async (input: any) => {
    const url = new URL(String(input))
    if (url.pathname.endsWith('/rest/ping')) {
      return new Response(JSON.stringify({ 'subsonic-response': { status: 'ok' } }), {
        status: 200,
        headers: { 'content-type': 'application/json' },
      })
    }
    if (url.pathname.endsWith('/rest/getAlbumList2')) {
      const offset = Number(url.searchParams.get('offset') ?? 0)
      return new Response(
        JSON.stringify(offset === 0 ? albumPage(500, 0) : albumPage(3, 500)),
        { status: 200, headers: { 'content-type': 'application/json' } }
      )
    }
    return new Response('nope', { status: 404 })
  }) as typeof fetch
}

async function appWithSubsonic() {
  const app = await buildTestApp(subsonicStub())
  const cookie = await setupAdmin(app)
  await app.inject({
    method: 'PUT',
    url: '/api/settings',
    ...auth(cookie),
    payload: {
      subsonicUrl: 'http://navidrome.local',
      subsonicUsername: 'sam',
      subsonicPassword: 'pass',
    },
  })
  return { app, cookie }
}

async function waitForDone(app: any, cookie: string, timeoutMs = 2000) {
  const start = Date.now()
  while (Date.now() - start < timeoutMs) {
    const state = (await app.inject({ method: 'GET', url: '/api/library/sync', ...auth(cookie) })).json()
    if (state.status !== 'running') return state
    await new Promise((r) => setTimeout(r, 10))
  }
  throw new Error('sync did not finish in time')
}

describe('library sync', () => {
  it('sync paginates subsonic and caches albums', async () => {
    const { app, cookie } = await appWithSubsonic()
    const start = await app.inject({ method: 'POST', url: '/api/library/sync', ...auth(cookie) })
    expect(start.statusCode).toBe(202)

    const state = await waitForDone(app, cookie)
    expect(state.status).toBe('done')
    expect(state.albums).toBe(503)
    expect(state.lastSyncedAt).toBeTruthy()

    const albums = await app.inject({ method: 'GET', url: '/api/library/albums?q=Album 7', ...auth(cookie) })
    expect(albums.json().albums.length).toBeGreaterThan(0)

    // idempotent re-sync: count stays 503 (upsert, no duplicates)
    await app.inject({ method: 'POST', url: '/api/library/sync', ...auth(cookie) })
    const second = await waitForDone(app, cookie)
    expect(second.albums).toBe(503)
    await app.close()
  })

  it('returns 409 without subsonic config', async () => {
    const app = await buildTestApp()
    const cookie = await setupAdmin(app)
    const res = await app.inject({ method: 'POST', url: '/api/library/sync', ...auth(cookie) })
    expect(res.statusCode).toBe(409)
    expect(res.json()).toEqual({ error: 'no_subsonic_config' })
    await app.close()
  })

  it('reports error state when album fetch fails after valid ping', async () => {
    // ping succeeds (settings validation passes) but getAlbumList2 fails (sync errors)
    const fetcher = (async (input: any) => {
      if (String(input).includes('/rest/ping')) {
        return new Response(JSON.stringify({ 'subsonic-response': { status: 'ok' } }), {
          status: 200,
          headers: { 'content-type': 'application/json' },
        })
      }
      throw new TypeError('fetch failed')
    }) as unknown as typeof fetch
    const app = await buildTestApp(fetcher)
    const cookie = await setupAdmin(app)
    await app.inject({
      method: 'PUT',
      url: '/api/settings',
      ...auth(cookie),
      payload: {
        subsonicUrl: 'http://flaky.local',
        subsonicUsername: 'sam',
        subsonicPassword: 'pass',
      },
    })
    await app.inject({ method: 'POST', url: '/api/library/sync', ...auth(cookie) })
    const state = await waitForDone(app, cookie)
    expect(state.status).toBe('error')
    expect(state.error).toBeTruthy()
    await app.close()
  })

  it('albums search is scoped per user', async () => {
    const { app, cookie } = await appWithSubsonic()
    await app.inject({ method: 'POST', url: '/api/library/sync', ...auth(cookie) })
    await waitForDone(app, cookie)

    const bobCookie = await loginAs(app, cookie, 'bob', 'bobpass123')
    const empty = await app.inject({ method: 'GET', url: '/api/library/albums?q=Album', ...auth(bobCookie) })
    expect(empty.json().albums).toHaveLength(0)
    await app.close()
  })

  it('test-seed route inserts albums directly (used by lookup/collection tests)', async () => {
    const app = await buildTestApp()
    const cookie = await setupAdmin(app)
    const res = await app.inject({
      method: 'POST',
      url: '/api/library/albums/test-seed',
      ...auth(cookie),
      payload: { albums: [{ subsonicId: 'a1', title: 'Motion', artist: 'The Cinematic Orchestra' }] },
    })
    expect(res.statusCode).toBe(200)
    expect(res.json().inserted).toBe(1)
    await app.close()
  })

  it('saving subsonic settings triggers a first sync', async () => {
    const { app, cookie } = await appWithSubsonic()
    const state = await waitForDone(app, cookie)
    expect(state.status).toBe('done')
    expect(state.albums).toBe(503)
    await app.close()
  })
})