import { describe, it, expect } from 'vitest'
import { openDatabase } from '../src/db.js'
import { buildTestAppWithDb, setupAdmin, auth } from './helpers.js'

const PASSWORD = 's3cret-pass-xyz'
const AUDIO = new TextEncoder().encode('fake-audio-payload')

interface UpstreamRequest {
  url: URL
  range: string | null
}

interface StubOptions {
  album?: () => Response
  stream?: (req: UpstreamRequest) => Response
  onStream?: (req: UpstreamRequest) => void
}

/** Subsonic stub: ping/getAlbumList2 always ok (settings PUT + sync); album/stream configurable. */
function subsonicStub(opts: StubOptions): typeof fetch {
  return (async (input: any, init?: 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')) {
      return new Response(
        JSON.stringify({ 'subsonic-response': { status: 'ok', albumList2: { album: [] } } }),
        { status: 200, headers: { 'content-type': 'application/json' } }
      )
    }
    if (url.pathname.endsWith('/rest/getAlbum')) {
      return opts.album ? opts.album() : new Response('nope', { status: 404 })
    }
    if (url.pathname.endsWith('/rest/stream')) {
      const req: UpstreamRequest = { url, range: init?.headers?.Range ?? null }
      opts.onStream?.(req)
      return opts.stream ? opts.stream(req) : new Response('nope', { status: 404 })
    }
    return new Response('nope', { status: 404 })
  }) as typeof fetch
}

async function appWithSubsonic(fetchImpl: typeof fetch) {
  const app = await buildTestAppWithDb(openDatabase(':memory:'), fetchImpl)
  const cookie = await setupAdmin(app)
  await app.inject({
    method: 'PUT',
    url: '/api/settings',
    ...auth(cookie),
    payload: { subsonicUrl: 'http://n.local', subsonicUsername: 'sam', subsonicPassword: PASSWORD },
  })
  return { app, cookie }
}

// Note: the played endpoint is covered in lastplayed.test.ts — this file
// focuses on the stream/album proxy behaviour.
describe('stream/album proxy routes', () => {
  it('forwards the Range header to the stream upstream', async () => {
    const seen: UpstreamRequest[] = []
    const { app, cookie } = await appWithSubsonic(
      subsonicStub({
        onStream: (req) => {
          seen.push(req)
        },
        stream: () =>
          new Response(AUDIO, { status: 200, headers: { 'content-type': 'audio/mpeg' } }),
      })
    )
    const res = await app.inject({
      method: 'GET',
      url: '/api/stream/song-1',
      ...auth(cookie),
      headers: { range: 'bytes=100-' },
    })
    expect(res.statusCode).toBe(200)
    expect(seen[0]?.range).toBe('bytes=100-')
    expect(res.body).toBe('fake-audio-payload')
    await app.close()
  })

  it('passes through an upstream 206 partial response with content-range', async () => {
    const { app, cookie } = await appWithSubsonic(
      subsonicStub({
        stream: () =>
          new Response(AUDIO, {
            status: 206,
            headers: { 'content-type': 'audio/mpeg', 'content-range': 'bytes 100-116/500' },
          }),
      })
    )
    const res = await app.inject({
      method: 'GET',
      url: '/api/stream/song-1',
      ...auth(cookie),
      headers: { range: 'bytes=100-' },
    })
    expect(res.statusCode).toBe(206)
    expect(res.headers['content-type']).toBe('audio/mpeg')
    expect(res.headers['content-range']).toBe('bytes 100-116/500')
    expect(res.body).toBe('fake-audio-payload')
    await app.close()
  })

  it('returns 502 stream_unavailable when the upstream fetch throws', async () => {
    const { app, cookie } = await appWithSubsonic(
      subsonicStub({
        stream: () => {
          throw new Error('upstream down')
        },
      })
    )
    const res = await app.inject({ method: 'GET', url: '/api/stream/song-1', ...auth(cookie) })
    expect(res.statusCode).toBe(502)
    expect(res.json()).toEqual({ error: 'stream_unavailable' })
    await app.close()
  })

  it('leaks no subsonic credentials in body or headers (token auth upstream)', async () => {
    const upstreamUrls: URL[] = []
    const { app, cookie } = await appWithSubsonic(
      subsonicStub({
        onStream: (req) => {
          upstreamUrls.push(req.url)
        },
        stream: () =>
          new Response(AUDIO, { status: 200, headers: { 'content-type': 'audio/mpeg' } }),
      })
    )
    const res = await app.inject({ method: 'GET', url: '/api/stream/song-1', ...auth(cookie) })
    expect(res.statusCode).toBe(200)
    expect(res.body).not.toContain(PASSWORD)
    expect(JSON.stringify(res.headers)).not.toContain(PASSWORD)
    // upstream request used token auth — raw password never sent
    const upstreamUrl = upstreamUrls[0]
    expect(upstreamUrl?.searchParams.get('u')).toBe('sam')
    expect(upstreamUrl?.searchParams.get('t')).toMatch(/^[0-9a-f]{32}$/)
    expect(upstreamUrl?.searchParams.has('p')).toBe(false)
    expect(upstreamUrl?.toString()).not.toContain(PASSWORD)
    await app.close()
  })

  it('album tracks endpoint returns the getAlbum payload with ordered tracks', async () => {
    const { app, cookie } = await appWithSubsonic(
      subsonicStub({
        album: () =>
          new Response(
            JSON.stringify({
              'subsonic-response': {
                status: 'ok',
                album: {
                  id: 'alb-1',
                  name: 'Motion',
                  artist: 'The Cinematic Orchestra',
                  song: [
                    { id: 's2', title: 'Theme de Yoyo', duration: 300, track: 2 },
                    { id: 's1', title: 'Overture', duration: 200, track: 1 },
                  ],
                },
              },
            }),
            { status: 200, headers: { 'content-type': 'application/json' } }
          ),
      })
    )
    const res = await app.inject({ method: 'GET', url: '/api/album/alb-1/tracks', ...auth(cookie) })
    expect(res.statusCode).toBe(200)
    expect(res.json()).toEqual({
      id: 'alb-1',
      title: 'Motion',
      artist: 'The Cinematic Orchestra',
      tracks: [
        { id: 's1', title: 'Overture', duration: 200, track: 1 },
        { id: 's2', title: 'Theme de Yoyo', duration: 300, track: 2 },
      ],
    })
    await app.close()
  })

  it('returns 502 subsonic_error when subsonic rejects the credentials', async () => {
    const { app, cookie } = await appWithSubsonic(
      subsonicStub({
        album: () =>
          new Response(
            JSON.stringify({
              'subsonic-response': {
                status: 'failed',
                error: { code: 40, message: 'Wrong username or password' },
              },
            }),
            { status: 200, headers: { 'content-type': 'application/json' } }
          ),
      })
    )
    const res = await app.inject({ method: 'GET', url: '/api/album/alb-1/tracks', ...auth(cookie) })
    expect(res.statusCode).toBe(502)
    expect(res.json().error).toBe('subsonic_error')
    await app.close()
  })
})