'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

function _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }

var stream = _interopDefault(require('stream'));

/*
 * merge2
 * https://github.com/teambition/merge2
 *
 * Copyright (c) 2014-2020 Teambition
 * Licensed under the MIT license.
 */

const PassThrough = stream.PassThrough;
const slice = Array.prototype.slice;

var merge2_1 = merge2;

function merge2 () {
  const streamsQueue = [];
  const args = slice.call(arguments);
  let merging = false;
  let options = args[args.length - 1];

  if (options && !Array.isArray(options) && options.pipe == null) {
    args.pop();
  } else {
    options = {};
  }

  const doEnd = options.end !== false;
  const doPipeError = options.pipeError === true;
  if (options.objectMode == null) {
    options.objectMode = true;
  }
  if (options.highWaterMark == null) {
    options.highWaterMark = 64 * 1024;
  }
  const mergedStream = PassThrough(options);

  function addStream () {
    for (let i = 0, len = arguments.length; i < len; i++) {
      streamsQueue.push(pauseStreams(arguments[i], options));
    }
    mergeStream();
    return this
  }

  function mergeStream () {
    if (merging) {
      return
    }
    merging = true;

    let streams = streamsQueue.shift();
    if (!streams) {
      process.nextTick(endStream);
      return
    }
    if (!Array.isArray(streams)) {
      streams = [streams];
    }

    let pipesCount = streams.length + 1;

    function next () {
      if (--pipesCount > 0) {
        return
      }
      merging = false;
      mergeStream();
    }

    function pipe (stream) {
      function onend () {
        stream.removeListener('merge2UnpipeEnd', onend);
        stream.removeListener('end', onend);
        if (doPipeError) {
          stream.removeListener('error', onerror);
        }
        next();
      }
      function onerror (err) {
        mergedStream.emit('error', err);
      }
      // skip ended stream
      if (stream._readableState.endEmitted) {
        return next()
      }

      stream.on('merge2UnpipeEnd', onend);
      stream.on('end', onend);

      if (doPipeError) {
        stream.on('error', onerror);
      }

      stream.pipe(mergedStream, { end: false });
      // compatible for old stream
      stream.resume();
    }

    for (let i = 0; i < streams.length; i++) {
      pipe(streams[i]);
    }

    next();
  }

  function endStream () {
    merging = false;
    // emit 'queueDrain' when all streams merged.
    mergedStream.emit('queueDrain');
    if (doEnd) {
      mergedStream.end();
    }
  }

  mergedStream.setMaxListeners(0);
  mergedStream.add = addStream;
  mergedStream.on('unpipe', function (stream) {
    stream.emit('merge2UnpipeEnd');
  });

  if (args.length) {
    addStream.apply(null, args);
  }
  return mergedStream
}

// check and pause streams for pipe.
function pauseStreams (streams, options) {
  if (!Array.isArray(streams)) {
    // Backwards-compat with old-style streams
    if (!streams._readableState && streams.pipe) {
      streams = streams.pipe(PassThrough(options));
    }
    if (!streams._readableState || !streams.pause || !streams.pipe) {
      throw new Error('Only readable stream can be merged.')
    }
    streams.pause();
  } else {
    for (let i = 0, len = streams.length; i < len; i++) {
      streams[i] = pauseStreams(streams[i], options);
    }
  }
  return streams
}

exports.__moduleExports = merge2_1;
exports.default = merge2_1;
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