'use strict';

var _commonjsHelpers = require('../../../_virtual/_commonjsHelpers.js');
var node = require('../../util-deprecate/node.js');
var stream = require('./internal/streams/stream.js');
var require$$0 = require('buffer');
var destroy = require('./internal/streams/destroy.js');
var state = require('./internal/streams/state.js');
var errors = require('../errors.js');
var inherits = require('../../inherits/inherits.js');
var _stream_duplex = require('./_stream_duplex.js');

var _stream_writable;
var hasRequired_stream_writable;

function require_stream_writable () {
	if (hasRequired_stream_writable) return _stream_writable;
	hasRequired_stream_writable = 1;

	_stream_writable = Writable;

	// It seems a linked list but it is not
	// there will be only 2 of these for each stream
	function CorkedRequest(state) {
	  var _this = this;
	  this.next = null;
	  this.entry = null;
	  this.finish = function () {
	    onCorkedFinish(_this, state);
	  };
	}
	/* </replacement> */

	/*<replacement>*/
	var Duplex;
	/*</replacement>*/

	Writable.WritableState = WritableState;

	/*<replacement>*/
	var internalUtil = {
	  deprecate: node.__require()
	};
	/*</replacement>*/

	/*<replacement>*/
	var Stream = stream.__require();
	/*</replacement>*/

	var Buffer = require$$0.Buffer;
	var OurUint8Array = (typeof _commonjsHelpers.commonjsGlobal !== 'undefined' ? _commonjsHelpers.commonjsGlobal : typeof window !== 'undefined' ? window : typeof self !== 'undefined' ? self : {}).Uint8Array || function () {};
	function _uint8ArrayToBuffer(chunk) {
	  return Buffer.from(chunk);
	}
	function _isUint8Array(obj) {
	  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
	}
	var destroyImpl = destroy.__require();
	var _require = state.__require(),
	  getHighWaterMark = _require.getHighWaterMark;
	var _require$codes = errors.__require().codes,
	  ERR_INVALID_ARG_TYPE = _require$codes.ERR_INVALID_ARG_TYPE,
	  ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED,
	  ERR_MULTIPLE_CALLBACK = _require$codes.ERR_MULTIPLE_CALLBACK,
	  ERR_STREAM_CANNOT_PIPE = _require$codes.ERR_STREAM_CANNOT_PIPE,
	  ERR_STREAM_DESTROYED = _require$codes.ERR_STREAM_DESTROYED,
	  ERR_STREAM_NULL_VALUES = _require$codes.ERR_STREAM_NULL_VALUES,
	  ERR_STREAM_WRITE_AFTER_END = _require$codes.ERR_STREAM_WRITE_AFTER_END,
	  ERR_UNKNOWN_ENCODING = _require$codes.ERR_UNKNOWN_ENCODING;
	var errorOrDestroy = destroyImpl.errorOrDestroy;
	inherits.__require()(Writable, Stream);
	function nop() {}
	function WritableState(options, stream, isDuplex) {
	  Duplex = Duplex || _stream_duplex.__require();
	  options = options || {};

	  // Duplex streams are both readable and writable, but share
	  // the same options object.
	  // However, some cases require setting options to different
	  // values for the readable and the writable sides of the duplex stream,
	  // e.g. options.readableObjectMode vs. options.writableObjectMode, etc.
	  if (typeof isDuplex !== 'boolean') isDuplex = stream instanceof Duplex;

	  // object stream flag to indicate whether or not this stream
	  // contains buffers or objects.
	  this.objectMode = !!options.objectMode;
	  if (isDuplex) this.objectMode = this.objectMode || !!options.writableObjectMode;

	  // the point at which write() starts returning false
	  // Note: 0 is a valid value, means that we always return false if
	  // the entire buffer is not flushed immediately on write()
	  this.highWaterMark = getHighWaterMark(this, options, 'writableHighWaterMark', isDuplex);

	  // if _final has been called
	  this.finalCalled = false;

	  // drain event flag.
	  this.needDrain = false;
	  // at the start of calling end()
	  this.ending = false;
	  // when end() has been called, and returned
	  this.ended = false;
	  // when 'finish' is emitted
	  this.finished = false;

	  // has it been destroyed
	  this.destroyed = false;

	  // should we decode strings into buffers before passing to _write?
	  // this is here so that some node-core streams can optimize string
	  // handling at a lower level.
	  var noDecode = options.decodeStrings === false;
	  this.decodeStrings = !noDecode;

	  // Crypto is kind of old and crusty.  Historically, its default string
	  // encoding is 'binary' so we have to make this configurable.
	  // Everything else in the universe uses 'utf8', though.
	  this.defaultEncoding = options.defaultEncoding || 'utf8';

	  // not an actual buffer we keep track of, but a measurement
	  // of how much we're waiting to get pushed to some underlying
	  // socket or file.
	  this.length = 0;

	  // a flag to see when we're in the middle of a write.
	  this.writing = false;

	  // when true all writes will be buffered until .uncork() call
	  this.corked = 0;

	  // a flag to be able to tell if the onwrite cb is called immediately,
	  // or on a later tick.  We set this to true at first, because any
	  // actions that shouldn't happen until "later" should generally also
	  // not happen before the first write call.
	  this.sync = true;

	  // a flag to know if we're processing previously buffered items, which
	  // may call the _write() callback in the same tick, so that we don't
	  // end up in an overlapped onwrite situation.
	  this.bufferProcessing = false;

	  // the callback that's passed to _write(chunk,cb)
	  this.onwrite = function (er) {
	    onwrite(stream, er);
	  };

	  // the callback that the user supplies to write(chunk,encoding,cb)
	  this.writecb = null;

	  // the amount that is being written when _write is called.
	  this.writelen = 0;
	  this.bufferedRequest = null;
	  this.lastBufferedRequest = null;

	  // number of pending user-supplied write callbacks
	  // this must be 0 before 'finish' can be emitted
	  this.pendingcb = 0;

	  // emit prefinish if the only thing we're waiting for is _write cbs
	  // This is relevant for synchronous Transform streams
	  this.prefinished = false;

	  // True if the error was already emitted and should not be thrown again
	  this.errorEmitted = false;

	  // Should close be emitted on destroy. Defaults to true.
	  this.emitClose = options.emitClose !== false;

	  // Should .destroy() be called after 'finish' (and potentially 'end')
	  this.autoDestroy = !!options.autoDestroy;

	  // count buffered requests
	  this.bufferedRequestCount = 0;

	  // allocate the first CorkedRequest, there is always
	  // one allocated and free to use, and we maintain at most two
	  this.corkedRequestsFree = new CorkedRequest(this);
	}
	WritableState.prototype.getBuffer = function getBuffer() {
	  var current = this.bufferedRequest;
	  var out = [];
	  while (current) {
	    out.push(current);
	    current = current.next;
	  }
	  return out;
	};
	(function () {
	  try {
	    Object.defineProperty(WritableState.prototype, 'buffer', {
	      get: internalUtil.deprecate(function writableStateBufferGetter() {
	        return this.getBuffer();
	      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')
	    });
	  } catch (_) {}
	})();

	// Test _writableState for inheritance to account for Duplex streams,
	// whose prototype chain only points to Readable.
	var realHasInstance;
	if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {
	  realHasInstance = Function.prototype[Symbol.hasInstance];
	  Object.defineProperty(Writable, Symbol.hasInstance, {
	    value: function value(object) {
	      if (realHasInstance.call(this, object)) return true;
	      if (this !== Writable) return false;
	      return object && object._writableState instanceof WritableState;
	    }
	  });
	} else {
	  realHasInstance = function realHasInstance(object) {
	    return object instanceof this;
	  };
	}
	function Writable(options) {
	  Duplex = Duplex || _stream_duplex.__require();

	  // Writable ctor is applied to Duplexes, too.
	  // `realHasInstance` is necessary because using plain `instanceof`
	  // would return false, as no `_writableState` property is attached.

	  // Trying to use the custom `instanceof` for Writable here will also break the
	  // Node.js LazyTransform implementation, which has a non-trivial getter for
	  // `_writableState` that would lead to infinite recursion.

	  // Checking for a Stream.Duplex instance is faster here instead of inside
	  // the WritableState constructor, at least with V8 6.5
	  var isDuplex = this instanceof Duplex;
	  if (!isDuplex && !realHasInstance.call(Writable, this)) return new Writable(options);
	  this._writableState = new WritableState(options, this, isDuplex);

	  // legacy.
	  this.writable = true;
	  if (options) {
	    if (typeof options.write === 'function') this._write = options.write;
	    if (typeof options.writev === 'function') this._writev = options.writev;
	    if (typeof options.destroy === 'function') this._destroy = options.destroy;
	    if (typeof options.final === 'function') this._final = options.final;
	  }
	  Stream.call(this);
	}

	// Otherwise people can pipe Writable streams, which is just wrong.
	Writable.prototype.pipe = function () {
	  errorOrDestroy(this, new ERR_STREAM_CANNOT_PIPE());
	};
	function writeAfterEnd(stream, cb) {
	  var er = new ERR_STREAM_WRITE_AFTER_END();
	  // TODO: defer error events consistently everywhere, not just the cb
	  errorOrDestroy(stream, er);
	  process.nextTick(cb, er);
	}

	// Checks that a user-supplied chunk is valid, especially for the particular
	// mode the stream is in. Currently this means that `null` is never accepted
	// and undefined/non-string values are only allowed in object mode.
	function validChunk(stream, state, chunk, cb) {
	  var er;
	  if (chunk === null) {
	    er = new ERR_STREAM_NULL_VALUES();
	  } else if (typeof chunk !== 'string' && !state.objectMode) {
	    er = new ERR_INVALID_ARG_TYPE('chunk', ['string', 'Buffer'], chunk);
	  }
	  if (er) {
	    errorOrDestroy(stream, er);
	    process.nextTick(cb, er);
	    return false;
	  }
	  return true;
	}
	Writable.prototype.write = function (chunk, encoding, cb) {
	  var state = this._writableState;
	  var ret = false;
	  var isBuf = !state.objectMode && _isUint8Array(chunk);
	  if (isBuf && !Buffer.isBuffer(chunk)) {
	    chunk = _uint8ArrayToBuffer(chunk);
	  }
	  if (typeof encoding === 'function') {
	    cb = encoding;
	    encoding = null;
	  }
	  if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
	  if (typeof cb !== 'function') cb = nop;
	  if (state.ending) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) {
	    state.pendingcb++;
	    ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb);
	  }
	  return ret;
	};
	Writable.prototype.cork = function () {
	  this._writableState.corked++;
	};
	Writable.prototype.uncork = function () {
	  var state = this._writableState;
	  if (state.corked) {
	    state.corked--;
	    if (!state.writing && !state.corked && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
	  }
	};
	Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
	  // node::ParseEncoding() requires lower case.
	  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
	  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new ERR_UNKNOWN_ENCODING(encoding);
	  this._writableState.defaultEncoding = encoding;
	  return this;
	};
	Object.defineProperty(Writable.prototype, 'writableBuffer', {
	  // making it explicit this property is not enumerable
	  // because otherwise some prototype manipulation in
	  // userland will fail
	  enumerable: false,
	  get: function get() {
	    return this._writableState && this._writableState.getBuffer();
	  }
	});
	function decodeChunk(state, chunk, encoding) {
	  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
	    chunk = Buffer.from(chunk, encoding);
	  }
	  return chunk;
	}
	Object.defineProperty(Writable.prototype, 'writableHighWaterMark', {
	  // making it explicit this property is not enumerable
	  // because otherwise some prototype manipulation in
	  // userland will fail
	  enumerable: false,
	  get: function get() {
	    return this._writableState.highWaterMark;
	  }
	});

	// if we're already writing something, then just put this
	// in the queue, and wait our turn.  Otherwise, call _write
	// If we return false, then we need a drain event, so set that flag.
	function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
	  if (!isBuf) {
	    var newChunk = decodeChunk(state, chunk, encoding);
	    if (chunk !== newChunk) {
	      isBuf = true;
	      encoding = 'buffer';
	      chunk = newChunk;
	    }
	  }
	  var len = state.objectMode ? 1 : chunk.length;
	  state.length += len;
	  var ret = state.length < state.highWaterMark;
	  // we must ensure that previous needDrain will not be reset to false.
	  if (!ret) state.needDrain = true;
	  if (state.writing || state.corked) {
	    var last = state.lastBufferedRequest;
	    state.lastBufferedRequest = {
	      chunk: chunk,
	      encoding: encoding,
	      isBuf: isBuf,
	      callback: cb,
	      next: null
	    };
	    if (last) {
	      last.next = state.lastBufferedRequest;
	    } else {
	      state.bufferedRequest = state.lastBufferedRequest;
	    }
	    state.bufferedRequestCount += 1;
	  } else {
	    doWrite(stream, state, false, len, chunk, encoding, cb);
	  }
	  return ret;
	}
	function doWrite(stream, state, writev, len, chunk, encoding, cb) {
	  state.writelen = len;
	  state.writecb = cb;
	  state.writing = true;
	  state.sync = true;
	  if (state.destroyed) state.onwrite(new ERR_STREAM_DESTROYED('write'));else if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
	  state.sync = false;
	}
	function onwriteError(stream, state, sync, er, cb) {
	  --state.pendingcb;
	  if (sync) {
	    // defer the callback if we are being called synchronously
	    // to avoid piling up things on the stack
	    process.nextTick(cb, er);
	    // this can emit finish, and it will always happen
	    // after error
	    process.nextTick(finishMaybe, stream, state);
	    stream._writableState.errorEmitted = true;
	    errorOrDestroy(stream, er);
	  } else {
	    // the caller expect this to happen before if
	    // it is async
	    cb(er);
	    stream._writableState.errorEmitted = true;
	    errorOrDestroy(stream, er);
	    // this can emit finish, but finish must
	    // always follow error
	    finishMaybe(stream, state);
	  }
	}
	function onwriteStateUpdate(state) {
	  state.writing = false;
	  state.writecb = null;
	  state.length -= state.writelen;
	  state.writelen = 0;
	}
	function onwrite(stream, er) {
	  var state = stream._writableState;
	  var sync = state.sync;
	  var cb = state.writecb;
	  if (typeof cb !== 'function') throw new ERR_MULTIPLE_CALLBACK();
	  onwriteStateUpdate(state);
	  if (er) onwriteError(stream, state, sync, er, cb);else {
	    // Check if we're actually ready to finish, but don't emit yet
	    var finished = needFinish(state) || stream.destroyed;
	    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
	      clearBuffer(stream, state);
	    }
	    if (sync) {
	      process.nextTick(afterWrite, stream, state, finished, cb);
	    } else {
	      afterWrite(stream, state, finished, cb);
	    }
	  }
	}
	function afterWrite(stream, state, finished, cb) {
	  if (!finished) onwriteDrain(stream, state);
	  state.pendingcb--;
	  cb();
	  finishMaybe(stream, state);
	}

	// Must force callback to be called on nextTick, so that we don't
	// emit 'drain' before the write() consumer gets the 'false' return
	// value, and has a chance to attach a 'drain' listener.
	function onwriteDrain(stream, state) {
	  if (state.length === 0 && state.needDrain) {
	    state.needDrain = false;
	    stream.emit('drain');
	  }
	}

	// if there's something in the buffer waiting, then process it
	function clearBuffer(stream, state) {
	  state.bufferProcessing = true;
	  var entry = state.bufferedRequest;
	  if (stream._writev && entry && entry.next) {
	    // Fast case, write everything using _writev()
	    var l = state.bufferedRequestCount;
	    var buffer = new Array(l);
	    var holder = state.corkedRequestsFree;
	    holder.entry = entry;
	    var count = 0;
	    var allBuffers = true;
	    while (entry) {
	      buffer[count] = entry;
	      if (!entry.isBuf) allBuffers = false;
	      entry = entry.next;
	      count += 1;
	    }
	    buffer.allBuffers = allBuffers;
	    doWrite(stream, state, true, state.length, buffer, '', holder.finish);

	    // doWrite is almost always async, defer these to save a bit of time
	    // as the hot path ends with doWrite
	    state.pendingcb++;
	    state.lastBufferedRequest = null;
	    if (holder.next) {
	      state.corkedRequestsFree = holder.next;
	      holder.next = null;
	    } else {
	      state.corkedRequestsFree = new CorkedRequest(state);
	    }
	    state.bufferedRequestCount = 0;
	  } else {
	    // Slow case, write chunks one-by-one
	    while (entry) {
	      var chunk = entry.chunk;
	      var encoding = entry.encoding;
	      var cb = entry.callback;
	      var len = state.objectMode ? 1 : chunk.length;
	      doWrite(stream, state, false, len, chunk, encoding, cb);
	      entry = entry.next;
	      state.bufferedRequestCount--;
	      // if we didn't call the onwrite immediately, then
	      // it means that we need to wait until it does.
	      // also, that means that the chunk and cb are currently
	      // being processed, so move the buffer counter past them.
	      if (state.writing) {
	        break;
	      }
	    }
	    if (entry === null) state.lastBufferedRequest = null;
	  }
	  state.bufferedRequest = entry;
	  state.bufferProcessing = false;
	}
	Writable.prototype._write = function (chunk, encoding, cb) {
	  cb(new ERR_METHOD_NOT_IMPLEMENTED('_write()'));
	};
	Writable.prototype._writev = null;
	Writable.prototype.end = function (chunk, encoding, cb) {
	  var state = this._writableState;
	  if (typeof chunk === 'function') {
	    cb = chunk;
	    chunk = null;
	    encoding = null;
	  } else if (typeof encoding === 'function') {
	    cb = encoding;
	    encoding = null;
	  }
	  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);

	  // .end() fully uncorks
	  if (state.corked) {
	    state.corked = 1;
	    this.uncork();
	  }

	  // ignore unnecessary end() calls.
	  if (!state.ending) endWritable(this, state, cb);
	  return this;
	};
	Object.defineProperty(Writable.prototype, 'writableLength', {
	  // making it explicit this property is not enumerable
	  // because otherwise some prototype manipulation in
	  // userland will fail
	  enumerable: false,
	  get: function get() {
	    return this._writableState.length;
	  }
	});
	function needFinish(state) {
	  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
	}
	function callFinal(stream, state) {
	  stream._final(function (err) {
	    state.pendingcb--;
	    if (err) {
	      errorOrDestroy(stream, err);
	    }
	    state.prefinished = true;
	    stream.emit('prefinish');
	    finishMaybe(stream, state);
	  });
	}
	function prefinish(stream, state) {
	  if (!state.prefinished && !state.finalCalled) {
	    if (typeof stream._final === 'function' && !state.destroyed) {
	      state.pendingcb++;
	      state.finalCalled = true;
	      process.nextTick(callFinal, stream, state);
	    } else {
	      state.prefinished = true;
	      stream.emit('prefinish');
	    }
	  }
	}
	function finishMaybe(stream, state) {
	  var need = needFinish(state);
	  if (need) {
	    prefinish(stream, state);
	    if (state.pendingcb === 0) {
	      state.finished = true;
	      stream.emit('finish');
	      if (state.autoDestroy) {
	        // In case of duplex streams we need a way to detect
	        // if the readable side is ready for autoDestroy as well
	        var rState = stream._readableState;
	        if (!rState || rState.autoDestroy && rState.endEmitted) {
	          stream.destroy();
	        }
	      }
	    }
	  }
	  return need;
	}
	function endWritable(stream, state, cb) {
	  state.ending = true;
	  finishMaybe(stream, state);
	  if (cb) {
	    if (state.finished) process.nextTick(cb);else stream.once('finish', cb);
	  }
	  state.ended = true;
	  stream.writable = false;
	}
	function onCorkedFinish(corkReq, state, err) {
	  var entry = corkReq.entry;
	  corkReq.entry = null;
	  while (entry) {
	    var cb = entry.callback;
	    state.pendingcb--;
	    cb(err);
	    entry = entry.next;
	  }

	  // reuse the free corkReq.
	  state.corkedRequestsFree.next = corkReq;
	}
	Object.defineProperty(Writable.prototype, 'destroyed', {
	  // making it explicit this property is not enumerable
	  // because otherwise some prototype manipulation in
	  // userland will fail
	  enumerable: false,
	  get: function get() {
	    if (this._writableState === undefined) {
	      return false;
	    }
	    return this._writableState.destroyed;
	  },
	  set: function set(value) {
	    // we ignore the value if the stream
	    // has not been initialized yet
	    if (!this._writableState) {
	      return;
	    }

	    // backward compatibility, the user is explicitly
	    // managing destroyed
	    this._writableState.destroyed = value;
	  }
	});
	Writable.prototype.destroy = destroyImpl.destroy;
	Writable.prototype._undestroy = destroyImpl.undestroy;
	Writable.prototype._destroy = function (err, cb) {
	  cb(err);
	};
	return _stream_writable;
}

exports.__require = require_stream_writable;
