import { expect } from 'chai'
import * as http from 'http'
import * as qs from 'querystring'
import * as path from 'path'
import * as WebSocket from 'ws'
import { ipcMain, session, WebContents, webContents } from 'electron'
import { AddressInfo } from 'net';
import { emittedOnce } from './events-helpers'

const fixturesPath = path.resolve(__dirname, '..', 'spec', 'fixtures')

describe('webRequest module', () => {
  const ses = session.defaultSession
  const server = http.createServer((req, res) => {
    if (req.url === '/serverRedirect') {
      res.statusCode = 301
      res.setHeader('Location', 'http://' + req.rawHeaders[1])
      res.end()
    } else {
      res.setHeader('Custom', ['Header'])
      let content = req.url
      if (req.headers.accept === '*/*;test/header') {
        content += 'header/received'
      }
      if (req.headers.origin === 'http://new-origin') {
        content += 'new/origin'
      }
      res.end(content)
    }
  })
  let defaultURL: string

  before((done) => {
    server.listen(0, '127.0.0.1', () => {
      const port = (server.address() as AddressInfo).port
      defaultURL = `http://127.0.0.1:${port}/`
      done()
    })
  })

  after(() => {
    server.close()
  })

  let contents: WebContents = null as unknown as WebContents
  // NB. sandbox: true is used because it makes navigations much (~8x) faster.
  before(async () => {
    contents = (webContents as any).create({sandbox: true})
    await contents.loadFile(path.join(fixturesPath, 'pages', 'jquery.html'))
  })
  after(() => (contents as any).destroy())

  async function ajax (url: string, options = {}) {
    return contents.executeJavaScript(`ajax("${url}", ${JSON.stringify(options)})`)
  }

  describe('webRequest.onBeforeRequest', () => {
    afterEach(() => {
      ses.webRequest.onBeforeRequest(null)
    })

    it('can cancel the request', async () => {
      ses.webRequest.onBeforeRequest((details, callback) => {
        callback({
          cancel: true
        })
      })
      await expect(ajax(defaultURL)).to.eventually.be.rejectedWith('404')
    })

    it('can filter URLs', async () => {
      const filter = { urls: [defaultURL + 'filter/*'] }
      ses.webRequest.onBeforeRequest(filter, (details, callback) => {
        callback({ cancel: true })
      })
      const { data } = await ajax(`${defaultURL}nofilter/test`)
      expect(data).to.equal('/nofilter/test')
      await expect(ajax(`${defaultURL}filter/test`)).to.eventually.be.rejectedWith('404')
    })

    it('receives details object', async () => {
      ses.webRequest.onBeforeRequest((details, callback) => {
        expect(details.id).to.be.a('number')
        expect(details.timestamp).to.be.a('number')
        expect(details.webContentsId).to.be.a('number')
        expect(details.url).to.be.a('string').that.is.equal(defaultURL)
        expect(details.method).to.be.a('string').that.is.equal('GET')
        expect(details.resourceType).to.be.a('string').that.is.equal('xhr')
        expect(details.uploadData).to.be.undefined()
        callback({})
      })
      const { data } = await ajax(defaultURL)
      expect(data).to.equal('/')
    })

    it('receives post data in details object', async () => {
      const postData = {
        name: 'post test',
        type: 'string'
      }
      ses.webRequest.onBeforeRequest((details, callback) => {
        expect(details.url).to.equal(defaultURL)
        expect(details.method).to.equal('POST')
        expect(details.uploadData).to.have.lengthOf(1)
        const data = qs.parse(details.uploadData[0].bytes.toString())
        expect(data).to.deep.equal(postData)
        callback({ cancel: true })
      })
      await expect(ajax(defaultURL, {
        type: 'POST',
        data: postData,
      })).to.eventually.be.rejectedWith('404')
    })

    it('can redirect the request', async () => {
      ses.webRequest.onBeforeRequest((details, callback) => {
        if (details.url === defaultURL) {
          callback({ redirectURL: `${defaultURL}redirect` })
        } else {
          callback({})
        }
      })
      const { data } = await ajax(defaultURL)
      expect(data).to.equal('/redirect')
    })

    it('does not crash for redirects', async () => {
      ses.webRequest.onBeforeRequest((details, callback) => {
        callback({ cancel: false })
      })
      await ajax(defaultURL + 'serverRedirect')
      await ajax(defaultURL + 'serverRedirect')
    })
  })

  describe('webRequest.onBeforeSendHeaders', () => {
    afterEach(() => {
      ses.webRequest.onBeforeSendHeaders(null)
    })

    it('receives details object', async () => {
      ses.webRequest.onBeforeSendHeaders((details, callback) => {
        expect(details.requestHeaders).to.be.an('object')
        expect(details.requestHeaders['Foo.Bar']).to.equal('baz')
        callback({})
      })
      const { data } = await ajax(defaultURL, { headers: { 'Foo.Bar': 'baz' } })
      expect(data).to.equal('/')
    })

    it('can change the request headers', async () => {
      ses.webRequest.onBeforeSendHeaders((details, callback) => {
        const requestHeaders = details.requestHeaders
        requestHeaders.Accept = '*/*;test/header'
        callback({ requestHeaders: requestHeaders })
      })
      const { data } = await ajax(defaultURL)
      expect(data).to.equal('/header/received')
    })

    it('can change CORS headers', async () => {
      ses.webRequest.onBeforeSendHeaders((details, callback) => {
        const requestHeaders = details.requestHeaders
        requestHeaders.Origin = 'http://new-origin'
        callback({ requestHeaders: requestHeaders })
      })
      const { data } = await ajax(defaultURL)
      expect(data).to.equal('/new/origin')
    })

    it('resets the whole headers', async () => {
      const requestHeaders = {
        Test: 'header'
      }
      ses.webRequest.onBeforeSendHeaders((details, callback) => {
        callback({ requestHeaders: requestHeaders })
      })
      ses.webRequest.onSendHeaders((details) => {
        expect(details.requestHeaders).to.deep.equal(requestHeaders)
      })
      await ajax(defaultURL)
    })
  })

  describe('webRequest.onSendHeaders', () => {
    afterEach(() => {
      ses.webRequest.onSendHeaders(null)
    })

    it('receives details object', async () => {
      ses.webRequest.onSendHeaders((details) => {
        expect(details.requestHeaders).to.be.an('object')
      })
      const { data } = await ajax(defaultURL)
      expect(data).to.equal('/')
    })
  })

  describe('webRequest.onHeadersReceived', () => {
    afterEach(() => {
      ses.webRequest.onHeadersReceived(null)
    })

    it('receives details object', async () => {
      ses.webRequest.onHeadersReceived((details, callback) => {
        expect(details.statusLine).to.equal('HTTP/1.1 200 OK')
        expect(details.statusCode).to.equal(200)
        expect(details.responseHeaders!['Custom']).to.deep.equal(['Header'])
        callback({})
      })
      const { data } = await ajax(defaultURL)
      expect(data).to.equal('/')
    })

    it('can change the response header', async () => {
      ses.webRequest.onHeadersReceived((details, callback) => {
        const responseHeaders = details.responseHeaders!
        responseHeaders['Custom'] = ['Changed'] as any
        callback({ responseHeaders: responseHeaders })
      })
      const { headers } = await ajax(defaultURL)
      expect(headers).to.match(/^custom: Changed$/m)
    })

    it('can change CORS headers', async () => {
      ses.webRequest.onHeadersReceived((details, callback) => {
        const responseHeaders = details.responseHeaders!
        responseHeaders['access-control-allow-origin'] = ['http://new-origin'] as any
        callback({ responseHeaders: responseHeaders })
      })
      const { headers } = await ajax(defaultURL)
      expect(headers).to.match(/^access-control-allow-origin: http:\/\/new-origin$/m)
    })

    it('does not change header by default', async () => {
      ses.webRequest.onHeadersReceived((details, callback) => {
        callback({})
      })
      const { data, headers } = await ajax(defaultURL)
      expect(headers).to.match(/^custom: Header$/m)
      expect(data).to.equal('/')
    })

    it('follows server redirect', async () => {
      ses.webRequest.onHeadersReceived((details, callback) => {
        const responseHeaders = details.responseHeaders
        callback({ responseHeaders: responseHeaders })
      })
      const { headers } = await ajax(defaultURL + 'serverRedirect')
      expect(headers).to.match(/^custom: Header$/m)
    })

    it('can change the header status', async () => {
      ses.webRequest.onHeadersReceived((details, callback) => {
        const responseHeaders = details.responseHeaders
        callback({
          responseHeaders: responseHeaders,
          statusLine: 'HTTP/1.1 404 Not Found'
        })
      })
      const { headers } = await contents.executeJavaScript(`new Promise((resolve, reject) => {
        const options = {
          ...${JSON.stringify({url: defaultURL})},
          success: (data, status, request) => {
            reject(new Error('expected failure'))
          },
          error: (xhr) => {
            resolve({ headers: xhr.getAllResponseHeaders() })
          }
        }
        $.ajax(options)
      })`)
      expect(headers).to.match(/^custom: Header$/m)
    })
  })

  describe('webRequest.onResponseStarted', () => {
    afterEach(() => {
      ses.webRequest.onResponseStarted(null)
    })

    it('receives details object', async () => {
      ses.webRequest.onResponseStarted((details) => {
        expect(details.fromCache).to.be.a('boolean')
        expect(details.statusLine).to.equal('HTTP/1.1 200 OK')
        expect(details.statusCode).to.equal(200)
        expect(details.responseHeaders!['Custom']).to.deep.equal(['Header'])
      })
      const { data, headers } = await ajax(defaultURL)
      expect(headers).to.match(/^custom: Header$/m)
      expect(data).to.equal('/')
    })
  })

  describe('webRequest.onBeforeRedirect', () => {
    afterEach(() => {
      ses.webRequest.onBeforeRedirect(null)
      ses.webRequest.onBeforeRequest(null)
    })

    it('receives details object', async () => {
      const redirectURL = defaultURL + 'redirect'
      ses.webRequest.onBeforeRequest((details, callback) => {
        if (details.url === defaultURL) {
          callback({ redirectURL: redirectURL })
        } else {
          callback({})
        }
      })
      ses.webRequest.onBeforeRedirect((details) => {
        expect(details.fromCache).to.be.a('boolean')
        expect(details.statusLine).to.equal('HTTP/1.1 307 Internal Redirect')
        expect(details.statusCode).to.equal(307)
        expect(details.redirectURL).to.equal(redirectURL)
      })
      const { data } = await ajax(defaultURL)
      expect(data).to.equal('/redirect')
    })
  })

  describe('webRequest.onCompleted', () => {
    afterEach(() => {
      ses.webRequest.onCompleted(null)
    })

    it('receives details object', async () => {
      ses.webRequest.onCompleted((details) => {
        expect(details.fromCache).to.be.a('boolean')
        expect(details.statusLine).to.equal('HTTP/1.1 200 OK')
        expect(details.statusCode).to.equal(200)
      })
      const { data } = await ajax(defaultURL)
      expect(data).to.equal('/')
    })
  })

  describe('webRequest.onErrorOccurred', () => {
    afterEach(() => {
      ses.webRequest.onErrorOccurred(null)
      ses.webRequest.onBeforeRequest(null)
    })

    it('receives details object', async () => {
      ses.webRequest.onBeforeRequest((details, callback) => {
        callback({ cancel: true })
      })
      ses.webRequest.onErrorOccurred((details) => {
        expect(details.error).to.equal('net::ERR_BLOCKED_BY_CLIENT')
      })
      await expect(ajax(defaultURL)).to.eventually.be.rejectedWith('404')
    })
  })

  describe('WebSocket connections', () => {
    it('can be proxyed', async () => {
      // Setup server.
      const reqHeaders : { [key: string] : any } = {}
      const server = http.createServer((req, res) => {
        reqHeaders[req.url!] = req.headers
        res.setHeader('foo1', 'bar1')
        res.end('ok')
      })
      const wss = new WebSocket.Server({ noServer: true })
      wss.on('connection', function connection (ws) {
        ws.on('message', function incoming (message) {
          if (message === 'foo') {
            ws.send('bar')
          }
        })
      })
      server.on('upgrade', function upgrade (request, socket, head) {
        const pathname = require('url').parse(request.url).pathname
        if (pathname === '/websocket') {
          reqHeaders[request.url] = request.headers
          wss.handleUpgrade(request, socket, head, function done (ws) {
            wss.emit('connection', ws, request)
          })
        }
      })

      // Start server.
      await new Promise(resolve => server.listen(0, '127.0.0.1', resolve))
      const port = String((server.address() as AddressInfo).port)

      // Use a separate session for testing.
      const ses = session.fromPartition('WebRequestWebSocket')

      // Setup listeners.
      const receivedHeaders : { [key: string] : any } = {}
      ses.webRequest.onBeforeSendHeaders((details, callback) => {
        details.requestHeaders.foo = 'bar'
        callback({ requestHeaders: details.requestHeaders })
      })
      ses.webRequest.onHeadersReceived((details, callback) => {
        const pathname = require('url').parse(details.url).pathname
        receivedHeaders[pathname] = details.responseHeaders
        callback({ cancel: false })
      })
      ses.webRequest.onResponseStarted((details) => {
        if (details.url.startsWith('ws://')) {
          expect(details.responseHeaders!['Connection'][0]).be.equal('Upgrade')
        } else if (details.url.startsWith('http')) {
          expect(details.responseHeaders!['foo1'][0]).be.equal('bar1')
        }
      })
      ses.webRequest.onSendHeaders((details) => {
        if (details.url.startsWith('ws://')) {
          expect(details.requestHeaders['foo']).be.equal('bar')
          expect(details.requestHeaders['Upgrade']).be.equal('websocket')
        } else if (details.url.startsWith('http')) {
          expect(details.requestHeaders['foo']).be.equal('bar')
        }
      })
      ses.webRequest.onCompleted((details) => {
        if (details.url.startsWith('ws://')) {
          expect(details['error']).be.equal('net::ERR_WS_UPGRADE')
        } else if (details.url.startsWith('http')) {
          expect(details['error']).be.equal('net::OK')
        }
      })

      const contents = (webContents as any).create({
        session: ses,
        nodeIntegration: true,
        webSecurity: false
      })

      // Cleanup.
      after(() => {
        contents.destroy()
        server.close()
        ses.webRequest.onBeforeRequest(null)
        ses.webRequest.onBeforeSendHeaders(null)
        ses.webRequest.onHeadersReceived(null)
        ses.webRequest.onResponseStarted(null)
        ses.webRequest.onSendHeaders(null)
        ses.webRequest.onCompleted(null)
      })

      contents.loadFile(path.join(__dirname, 'fixtures', 'api', 'webrequest.html'), { query: { port } })
      await emittedOnce(ipcMain, 'websocket-success')

      expect(receivedHeaders['/websocket']['Upgrade'][0]).to.equal('websocket')
      expect(receivedHeaders['/']['foo1'][0]).to.equal('bar1')
      expect(reqHeaders['/websocket']['foo']).to.equal('bar')
      expect(reqHeaders['/']['foo']).to.equal('bar')
    })
  })
})
