process.env.NODE_TLS_REJECT_UNAUTHORIZED = '0';
const path = require('path');
const fs = require('fs');
const urllib = require('urllib');
const request = require('request');
const { basicProxyRequest, proxyServerWithRule, } = require('./util.js');
const http = require('http');
const WebSocket = require('ws');
const tunnel = require('tunnel');

let proxyServer;
let proxyPort;
let proxyHost;
let proxyWebInterfaceHost;
beforeAll(async () => {
  jest.DEFAULT_TIMEOUT_INTERVAL = 20 * 1000;
  proxyServer = await proxyServerWithRule({}, {});
  proxyPort = proxyServer.proxyPort;
  proxyHost = `http://localhost:${proxyPort}`;
  const proxyWebInterfacePort = proxyServer.webServerInstance.webPort;
  proxyWebInterfaceHost = `http://localhost:${proxyWebInterfacePort}`;
});

afterAll(() => {
  return proxyServer && proxyServer.close();
});

function doProxyWebSocket(url, headers = {}) {
  let agent = new tunnel.httpOverHttp({
    proxy: {
      hostname: 'localhost',
      port: proxyPort,
    }
  })

  if (url.indexOf('wss') === 0) {
    agent = new tunnel.httpsOverHttp({
      rejectUnauthorized: false,
      proxy: {
        hostname: 'localhost',
        port: proxyPort,
      }
    })
  }

  const ws = new WebSocket(url, {
    agent,
    rejectUnauthorized: false,
    headers
  });

  return ws;
}

['http', 'https'].forEach(protocol => {
  describe(`${protocol} - HTTP verbs`, () => {
    const assertProxyRes = (result) => {
      const proxyRes = result.response;
      const body = JSON.parse(result.body);
      expect(proxyRes.statusCode).toBe(200);
      expect(body.args).toMatchSnapshot('args');
      expect(body.data).toMatchSnapshot('data');
      return body;
    };
  
    it('GET', async () => {
      const url = `${protocol}://httpbin.org/get`;
      const getParam = {
        param: 'param_value'
      };
      await basicProxyRequest(proxyHost, 'GET', url, {}, getParam).then(assertProxyRes);
    });
  
    it('POST body and header', async () => {
      const url = `${protocol}://httpbin.org/post`;
      const payloadStream = fs.createReadStream(path.resolve(__dirname, './fixtures/image.png'));
  
      const postHeaders = {
        anyproxy_header: 'header_value',
      };
  
      const body = await basicProxyRequest(proxyHost, 'POST', url, postHeaders, {}, payloadStream).then(assertProxyRes);
      expect(body.headers['Anyproxy-Header']).toBe(postHeaders.anyproxy_header);
    });
  
    it('PUT', async () => {
      const url = `${protocol}://httpbin.org/put`;
      const payloadStream = fs.createReadStream(path.resolve(__dirname, './fixtures/image.png'));
      await basicProxyRequest(proxyHost, 'PUT', url, {}, undefined, payloadStream).then(assertProxyRes);
    });
  
    it('DELETE', async () => {
      const url = `${protocol}://httpbin.org/delete`;
      const param = {
        foo: 'bar',
      };
      await basicProxyRequest(proxyHost, 'DELETE', url, {}, param).then(assertProxyRes);
    });
  
    it('PATCH', async () => {
      const url = `${protocol}://httpbin.org/patch`;
      await basicProxyRequest(proxyHost, 'PATCH', url).then(assertProxyRes);
    });

    it('Websocket', async () => {
      const expectEcho = (ws) => {
        return new Promise((resolve, reject) => {
          const wsMsg = Buffer.alloc(100 * 1024, 'a').toString(); // 100kb

          ws.on('open', () => {
            ws.send(wsMsg);
          });
    
          ws.on('message', (msg) => {
            expect(msg).toBe(wsMsg);
            ws.close();
            resolve();
          });
        });
      };

      const wsUrl = `${protocol === 'https' ? 'wss' : 'ws'}://echo.websocket.org`;
      const ws = doProxyWebSocket(wsUrl, {});
      await expectEcho(ws);
    });
  });
});

describe('status code and headers', () => {
  [302, 404, 500].forEach(statusCode => {
    it(`GET ${statusCode}`, async () => {
      const status = statusCode;
      const url = `http://httpbin.org/status/${status}`;
      const result = await basicProxyRequest(proxyHost, 'GET', url, {}, {});
      const proxyRes = result.response;
      expect(proxyRes.statusCode).toBe(statusCode);
    });

    it(`PUT ${statusCode}`, async () => {
      const status = statusCode;
      const url = `http://httpbin.org/status/${status}`;
      const result = await basicProxyRequest(proxyHost, 'PUT', url, {}, {});
      const proxyRes = result.response;
      expect(proxyRes.statusCode).toBe(statusCode);
    });
  });
});

describe('response data formats', () => {
  ['brotli', 'deflate', 'gzip'].forEach(encoding => {
    it(`GET ${encoding}`, async () => {
      const url = `http://httpbin.org/${encoding}`;
      const result = await basicProxyRequest(proxyHost, 'GET', url);
      const headers = result.response.headers;
      const body = JSON.parse(result.body);
      expect(headers['content-encoding']).toBeUndefined(); // should be removed by anyproxy
      expect(body.brotli || body.deflated || body.gzipped).toBeTruthy();
    });
  });
});

describe('big files', () => {
  const BIG_FILE_SIZE = 100 * 1024 * 1024 - 1; // 100 mb
  const BUFFER_FILL = 'a';

  let server;
  beforeAll(() => {
    server = http.createServer({}, (req, res) => {
      if (/download/.test(req.url)) {
        const bufferContent = Buffer.alloc(BIG_FILE_SIZE, BUFFER_FILL);
        res.write(bufferContent);
        res.end();
      } else if (/upload/.test(req.url)) {
        let reqPayloadSize = 0;
        req.on('data', (data) => {
          const bufferLength = data.length;
          reqPayloadSize += bufferLength;
          const expectBufferContent = Buffer.alloc(bufferLength, BUFFER_FILL);
          if (!expectBufferContent.equals(data)) {
            res.statusCode = 500;
            res.write('content not match');
          }
        }).on('end', () => {
          if (res.statusCode === 500 || reqPayloadSize !== BIG_FILE_SIZE) {
            res.statusCode = 500;
          } else {
            res.statusCode = 200;
          }
          res.end();
        });
      }
    });

    server.listen(3000);
  });

  afterAll((done) => {
    server && server.close(done);
  });

  it('download big file', (done) => {
    let responseSizeCount = 0;
    request({
      url: 'http://127.0.0.1:3000/download',
      proxy: proxyHost,
    }).on('data', (data) => {
      const bufferLength = data.length;
      responseSizeCount += bufferLength;
      const expectBufferContent = Buffer.alloc(bufferLength, BUFFER_FILL);
      if (!expectBufferContent.equals(data)) {
        return done(new Error('download content not match'));
      }
    }).on('end', () => {
      if (responseSizeCount !== BIG_FILE_SIZE) {
        return done(new Error('file size not match'));
      }
      done();
    });
  }, 120 * 1000);

  it('upload big file', (done) => {
    const bufferContent = Buffer.alloc(BIG_FILE_SIZE, BUFFER_FILL);
    const req = request({
      url: 'http://127.0.0.1:3000/upload',
      method: 'POST',
      proxy: proxyHost,
    }, (err, response, body) => {
      if (err) {
        return done(err);
      } else if (response.statusCode !== 200) {
        return done(new Error('upload failed ' + body));
      }
      done();
    });
    req.write(bufferContent);
    req.end();
  }, 120 * 1000);
});

describe('web interface', () => {
  it('should be available', async () => {
    await urllib.request(proxyWebInterfaceHost).then((result) => {
      expect(result.status).toBe(200);
    });
  });
});