import { describe, it, expect, beforeAll, afterAll, vi } from 'vitest'
import * as ftp from 'basic-ftp'
import { FTPServer } from '../adapters/server/ftp.js'
import type { BaseClient } from '../adapters/client/base.js'
import {
  createMockClient, populateCache,
  HOME_TREE, HOME_FILES, STORAGE_TREE, STORAGE_FILES,
} from './helpers.js'

vi.mock('../logger.js', () => ({
  logger: {
    info: vi.fn(),
    error: vi.fn(),
    warn: vi.fn(),
  },
}))

const TEST_PORT = 2391
const TEST_USER = 'testuser'
const TEST_PASS = 'testpass'

/** Creates a connected + authenticated FTP client. */
async function connectFTP(): Promise<ftp.Client> {
  const client = new ftp.Client()
  await client.access({
    host: '127.0.0.1',
    port: TEST_PORT,
    user: TEST_USER,
    password: TEST_PASS,
    secure: false,
  })
  return client
}

describe('E2E: FTP Server', () => {
  let server: FTPServer
  let homeClient: BaseClient
  let storageClient: BaseClient

  beforeAll(async () => {
    homeClient = createMockClient('/home', HOME_TREE, HOME_FILES)
    storageClient = createMockClient('/storage', STORAGE_TREE, STORAGE_FILES)

    await populateCache(homeClient, HOME_TREE)
    await populateCache(storageClient, STORAGE_TREE)

    server = new FTPServer(
      [homeClient, storageClient],
      { port: TEST_PORT, pasv_url: '127.0.0.1', pasv_min: 3000, pasv_max: 3100 },
      { username: TEST_USER, password: TEST_PASS },
    )
    await server.start()
  })

  afterAll(async () => {
    await server.stop()
  })

  // ---------------------------------------------------------------------------
  // Authentication
  // ---------------------------------------------------------------------------

  it('should reject invalid credentials', async () => {
    const client = new ftp.Client()
    await expect(
      client.access({
        host: '127.0.0.1',
        port: TEST_PORT,
        user: 'wrong',
        password: 'wrong',
        secure: false,
      })
    ).rejects.toThrow()
    client.close()
  })

  // ---------------------------------------------------------------------------
  // Directory listing
  // ---------------------------------------------------------------------------

  it('should list the virtual root', async () => {
    const client = await connectFTP()
    try {
      const list = await client.list('/')
      const names = list.map(e => e.name)
      expect(names).toContain('home')
      expect(names).toContain('storage')
    } finally {
      client.close()
    }
  })

  it('should list mount point contents', async () => {
    const client = await connectFTP()
    try {
      const list = await client.list('/home')
      const names = list.map(e => e.name)
      expect(names).toContain('docs')
      expect(names).toContain('readme.txt')
    } finally {
      client.close()
    }
  })

  it('should list nested directory contents', async () => {
    const client = await connectFTP()
    try {
      const list = await client.list('/home/docs')
      const names = list.map(e => e.name)
      expect(names).toContain('hello.txt')
      expect(names).toContain('world.txt')
    } finally {
      client.close()
    }
  })

  it('should list storage mount contents', async () => {
    const client = await connectFTP()
    try {
      const list = await client.list('/storage/backups')
      const names = list.map(e => e.name)
      expect(names).toContain('db.sql')
    } finally {
      client.close()
    }
  })

  // ---------------------------------------------------------------------------
  // Directory navigation
  // ---------------------------------------------------------------------------

  it('should change directory to mount point', async () => {
    const client = await connectFTP()
    try {
      await client.cd('/home')
      const pwd = await client.pwd()
      expect(pwd).toBe('/home')
    } finally {
      client.close()
    }
  })

  it('should change directory to nested path', async () => {
    const client = await connectFTP()
    try {
      await client.cd('/home/docs')
      const pwd = await client.pwd()
      expect(pwd).toBe('/home/docs')
    } finally {
      client.close()
    }
  })

  // ---------------------------------------------------------------------------
  // File download
  // ---------------------------------------------------------------------------

  it('should download a file', async () => {
    const client = await connectFTP()
    try {
      const chunks: Buffer[] = []
      const writable = new (await import('node:stream')).PassThrough()
      writable.on('data', (chunk: Buffer) => chunks.push(chunk))

      await client.downloadTo(writable, '/home/readme.txt')
      const content = Buffer.concat(chunks).toString()
      expect(content).toBe('Hello from home!')
    } finally {
      client.close()
    }
  })

  it('should download a nested file', async () => {
    const client = await connectFTP()
    try {
      const chunks: Buffer[] = []
      const writable = new (await import('node:stream')).PassThrough()
      writable.on('data', (chunk: Buffer) => chunks.push(chunk))

      await client.downloadTo(writable, '/home/docs/hello.txt')
      const content = Buffer.concat(chunks).toString()
      expect(content).toBe('Hello, World!')
    } finally {
      client.close()
    }
  })

  // ---------------------------------------------------------------------------
  // File upload
  // ---------------------------------------------------------------------------

  it('should upload a file', async () => {
    const client = await connectFTP()
    try {
      const { Readable } = await import('node:stream')
      const readable = Readable.from(Buffer.from('Uploaded content'))

      await client.uploadFrom(readable, '/home/uploaded.txt')
      expect(homeClient.write).toHaveBeenCalled()
    } finally {
      client.close()
    }
  })

  // ---------------------------------------------------------------------------
  // Directory creation
  // ---------------------------------------------------------------------------

  it('should create a directory', async () => {
    const client = await connectFTP()
    try {
      // Use raw MKD command — ensureDir does CWD+MKD which fails on virtual paths
      await client.send('MKD /home/new-dir')
      expect(homeClient.mkdir).toHaveBeenCalledWith('/new-dir')
    } finally {
      client.close()
    }
  })

  // ---------------------------------------------------------------------------
  // Delete
  // ---------------------------------------------------------------------------

  it('should delete a file', async () => {
    const client = await connectFTP()
    try {
      await client.remove('/home/readme.txt')
      expect(homeClient.delete).toHaveBeenCalledWith('/readme.txt')
    } finally {
      client.close()
    }
  })

  // ---------------------------------------------------------------------------
  // Rename
  // ---------------------------------------------------------------------------

  it('should rename a file', async () => {
    const client = await connectFTP()
    try {
      await client.rename('/home/readme.txt', '/home/renamed.txt')
      expect(homeClient.rename).toHaveBeenCalledWith('/readme.txt', '/renamed.txt')
    } finally {
      client.close()
    }
  })
})