"use strict";

const _ = require('lodash');

const os = require('os');

const cp = require('child_process');

const path = require('path');

const Promise = require('bluebird');

const debug = require('debug')('cypress:cli');

const debugElectron = require('debug')('cypress:electron');

const util = require('../util');

const state = require('../tasks/state');

const xvfb = require('./xvfb');

const verify = require('../tasks/verify');

const errors = require('../errors');

const isXlibOrLibudevRe = /^(?:Xlib|libudev)/;
const isHighSierraWarningRe = /\*\*\* WARNING/;
const isRenderWorkerRe = /\.RenderWorker-/;
const GARBAGE_WARNINGS = [isXlibOrLibudevRe, isHighSierraWarningRe, isRenderWorkerRe];

const isGarbageLineWarning = str => {
  return _.some(GARBAGE_WARNINGS, re => {
    return re.test(str);
  });
};

function isPlatform(platform) {
  return os.platform() === platform;
}

function needsStderrPiped(needsXvfb) {
  return _.some([isPlatform('darwin'), needsXvfb && isPlatform('linux'), util.isPossibleLinuxWithIncorrectDisplay()]);
}

function needsEverythingPipedDirectly() {
  return isPlatform('win32');
}

function getStdio(needsXvfb) {
  if (needsEverythingPipedDirectly()) {
    return 'pipe';
  } // https://github.com/cypress-io/cypress/issues/921
  // https://github.com/cypress-io/cypress/issues/1143
  // https://github.com/cypress-io/cypress/issues/1745


  if (needsStderrPiped(needsXvfb)) {
    // returning pipe here so we can massage stderr
    // and remove garbage from Xlib and libuv
    // due to starting the Xvfb process on linux
    return ['inherit', 'inherit', 'pipe'];
  }

  return 'inherit';
}

module.exports = {
  isGarbageLineWarning,

  start(args, options = {}) {
    const needsXvfb = xvfb.isNeeded();
    let executable = state.getPathToExecutable(state.getBinaryDir());

    if (util.getEnv('CYPRESS_RUN_BINARY')) {
      executable = path.resolve(util.getEnv('CYPRESS_RUN_BINARY'));
    }

    debug('needs to start own Xvfb?', needsXvfb); // 1. Start arguments with "--" so Electron knows these are OUR
    // arguments and does not try to sanitize them. Otherwise on Windows
    // an url in one of the arguments crashes it :(
    // https://github.com/cypress-io/cypress/issues/5466
    // 2. Always push cwd into the args
    // which additionally acts as a signal to the
    // binary that it was invoked through the NPM module

    args = ['--'].concat(args, '--cwd', process.cwd());

    _.defaults(options, {
      dev: false,
      env: process.env,
      detached: false,
      stdio: getStdio(needsXvfb)
    });

    const spawn = (overrides = {}) => {
      return new Promise((resolve, reject) => {
        _.defaults(overrides, {
          onStderrData: false,
          electronLogging: false
        });

        if (options.dev) {
          // if we're in dev then reset
          // the launch cmd to be 'npm run dev'
          executable = 'node';
          args.unshift(path.resolve(__dirname, '..', '..', '..', 'scripts', 'start.js'));
          debug('in dev mode the args became %o', args);
        }

        const {
          onStderrData,
          electronLogging
        } = overrides;
        const envOverrides = util.getEnvOverrides(options);

        const electronArgs = _.clone(args);

        const node11WindowsFix = isPlatform('win32');

        if (!options.dev && verify.needsSandbox()) {
          // this is one of the Electron's command line switches
          // thus it needs to be before "--" separator
          electronArgs.unshift('--no-sandbox');
        } // strip dev out of child process options


        let stdioOptions = _.pick(options, 'env', 'detached', 'stdio'); // figure out if we're going to be force enabling or disabling colors.
        // also figure out whether we should force stdout and stderr into thinking
        // it is a tty as opposed to a pipe.


        stdioOptions.env = _.extend({}, stdioOptions.env, envOverrides);

        if (node11WindowsFix) {
          stdioOptions = _.extend({}, stdioOptions, {
            windowsHide: false
          });
        }

        if (electronLogging) {
          stdioOptions.env.ELECTRON_ENABLE_LOGGING = true;
        }

        if (util.isPossibleLinuxWithIncorrectDisplay()) {
          // make sure we use the latest DISPLAY variable if any
          debug('passing DISPLAY', process.env.DISPLAY);
          stdioOptions.env.DISPLAY = process.env.DISPLAY;
        }

        debug('spawning Cypress with executable: %s', executable);
        debug('spawn args %o %o', electronArgs, _.omit(stdioOptions, 'env'));
        const child = cp.spawn(executable, electronArgs, stdioOptions);

        function resolveOn(event) {
          return function (code, signal) {
            debug('child event fired %o', {
              event,
              code,
              signal
            });

            if (code === null) {
              const errorObject = errors.errors.childProcessKilled(event, signal);
              return errors.getError(errorObject).then(reject);
            }

            resolve(code);
          };
        }

        child.on('close', resolveOn('close'));
        child.on('exit', resolveOn('exit'));
        child.on('error', reject); // if stdio options is set to 'pipe', then
        //   we should set up pipes:
        //  process STDIN (read stream) => child STDIN (writeable)
        //  child STDOUT => process STDOUT
        //  child STDERR => process STDERR with additional filtering

        if (child.stdin) {
          debug('piping process STDIN into child STDIN');
          process.stdin.pipe(child.stdin);
        }

        if (child.stdout) {
          debug('piping child STDOUT to process STDOUT');
          child.stdout.pipe(process.stdout);
        } // if this is defined then we are manually piping for linux
        // to filter out the garbage


        if (child.stderr) {
          debug('piping child STDERR to process STDERR');
          child.stderr.on('data', data => {
            const str = data.toString(); // bail if this is warning line garbage

            if (isGarbageLineWarning(str)) {
              return;
            } // if we have a callback and this explictly returns
            // false then bail


            if (onStderrData && onStderrData(str) === false) {
              return;
            } // else pass it along!


            process.stderr.write(data);
          });
        } // https://github.com/cypress-io/cypress/issues/1841
        // https://github.com/cypress-io/cypress/issues/5241
        // In some versions of node, it will throw on windows
        // when you close the parent process after piping
        // into the child process. unpiping does not seem
        // to have any effect. so we're just catching the
        // error here and not doing anything.


        process.stdin.on('error', err => {
          if (['EPIPE', 'ENOTCONN'].includes(err.code)) {
            return;
          }

          throw err;
        });

        if (stdioOptions.detached) {
          child.unref();
        }
      });
    };

    const spawnInXvfb = () => {
      return xvfb.start().then(userFriendlySpawn).finally(xvfb.stop);
    };

    const userFriendlySpawn = linuxWithDisplayEnv => {
      debug('spawning, should retry on display problem?', Boolean(linuxWithDisplayEnv));
      let brokenGtkDisplay;
      const overrides = {};

      if (linuxWithDisplayEnv) {
        _.extend(overrides, {
          electronLogging: true,

          onStderrData(str) {
            // if we receive a broken pipe anywhere
            // then we know that's why cypress exited early
            if (util.isBrokenGtkDisplay(str)) {
              brokenGtkDisplay = true;
            } // we should attempt to always slurp up
            // the stderr logs unless we've explicitly
            // enabled the electron debug logging


            if (!debugElectron.enabled) {
              return false;
            }
          }

        });
      }

      return spawn(overrides).then(code => {
        if (code !== 0 && brokenGtkDisplay) {
          util.logBrokenGtkDisplayWarning();
          return spawnInXvfb();
        }

        return code;
      }) // we can format and handle an error message from the code above
      // prevent wrapping error again by using "known: undefined" filter
      .catch({
        known: undefined
      }, errors.throwFormErrorText(errors.errors.unexpected));
    };

    if (needsXvfb) {
      return spawnInXvfb();
    } // if we are on linux and there's already a DISPLAY
    // set, then we may need to rerun cypress after
    // spawning our own Xvfb server


    const linuxWithDisplayEnv = util.isPossibleLinuxWithIncorrectDisplay();
    return userFriendlySpawn(linuxWithDisplayEnv);
  }

};