/* Blob.js
 * A Blob, File, FileReader & URL implementation.
 * 2019-04-19
 *
 * By Eli Grey, http://eligrey.com
 * By Jimmy Wärting, https://github.com/jimmywarting
 * License: MIT
 *   See https://github.com/eligrey/Blob.js/blob/master/LICENSE.md
 */

;(function () {
  var global =
    typeof window === "object" ? window : typeof self === "object" ? self : this

  var BlobBuilder =
    global.BlobBuilder ||
    global.WebKitBlobBuilder ||
    global.MSBlobBuilder ||
    global.MozBlobBuilder

  global.URL =
    global.URL ||
    global.webkitURL ||
    function (href, a) {
      a = document.createElement("a")
      a.href = href
      return a
    }

  var origBlob = global.Blob
  var createObjectURL = URL.createObjectURL
  var revokeObjectURL = URL.revokeObjectURL
  var strTag = global.Symbol && global.Symbol.toStringTag
  var blobSupported = false
  var blobSupportsArrayBufferView = false
  var arrayBufferSupported = !!global.ArrayBuffer
  var blobBuilderSupported =
    BlobBuilder && BlobBuilder.prototype.append && BlobBuilder.prototype.getBlob

  try {
    // Check if Blob constructor is supported
    blobSupported = new Blob(["ä"]).size === 2

    // Check if Blob constructor supports ArrayBufferViews
    // Fails in Safari 6, so we need to map to ArrayBuffers there.
    blobSupportsArrayBufferView = new Blob([new Uint8Array([1, 2])]).size === 2
  } catch (e) {}

  /**
   * Helper function that maps ArrayBufferViews to ArrayBuffers
   * Used by BlobBuilder constructor and old browsers that didn't
   * support it in the Blob constructor.
   */
  function mapArrayBufferViews (ary) {
    return ary.map(function (chunk) {
      if (chunk.buffer instanceof ArrayBuffer) {
        var buf = chunk.buffer

        // if this is a subarray, make a copy so we only
        // include the subarray region from the underlying buffer
        if (chunk.byteLength !== buf.byteLength) {
          var copy = new Uint8Array(chunk.byteLength)
          copy.set(new Uint8Array(buf, chunk.byteOffset, chunk.byteLength))
          buf = copy.buffer
        }

        return buf
      }

      return chunk
    })
  }

  function BlobBuilderConstructor (ary, options) {
    options = options || {}

    var bb = new BlobBuilder()
    mapArrayBufferViews(ary).forEach(function (part) {
      bb.append(part)
    })

    return options.type ? bb.getBlob(options.type) : bb.getBlob()
  }

  function BlobConstructor (ary, options) {
    return new origBlob(mapArrayBufferViews(ary), options || {})
  }

  if (global.Blob) {
    BlobBuilderConstructor.prototype = Blob.prototype
    BlobConstructor.prototype = Blob.prototype
  }

  /********************************************************/
  /*               String Encoder fallback                */
  /********************************************************/
  function stringEncode (string) {
    var pos = 0
    var len = string.length
    var out = []
    var Arr = global.Uint8Array || Array // Use byte array when possible

    var at = 0 // output position
    var tlen = Math.max(32, len + (len >> 1) + 7) // 1.5x size
    var target = new Arr((tlen >> 3) << 3) // ... but at 8 byte offset

    while (pos < len) {
      var value = string.charCodeAt(pos++)
      if (value >= 0xd800 && value <= 0xdbff) {
        // high surrogate
        if (pos < len) {
          var extra = string.charCodeAt(pos)
          if ((extra & 0xfc00) === 0xdc00) {
            ++pos
            value = ((value & 0x3ff) << 10) + (extra & 0x3ff) + 0x10000
          }
        }
        if (value >= 0xd800 && value <= 0xdbff) {
          continue // drop lone surrogate
        }
      }

      // expand the buffer if we couldn't write 4 bytes
      if (at + 4 > target.length) {
        tlen += 8 // minimum extra
        tlen *= 1.0 + (pos / string.length) * 2 // take 2x the remaining
        tlen = (tlen >> 3) << 3 // 8 byte offset

        const update = new Uint8Array(tlen)
        update.set(target)
        target = update
      }

      if ((value & 0xffffff80) === 0) {
        // 1-byte
        target[at++] = value // ASCII
        continue
      } else if ((value & 0xfffff800) === 0) {
        // 2-byte
        target[at++] = ((value >> 6) & 0x1f) | 0xc0
      } else if ((value & 0xffff0000) === 0) {
        // 3-byte
        target[at++] = ((value >> 12) & 0x0f) | 0xe0
        target[at++] = ((value >> 6) & 0x3f) | 0x80
      } else if ((value & 0xffe00000) === 0) {
        // 4-byte
        target[at++] = ((value >> 18) & 0x07) | 0xf0
        target[at++] = ((value >> 12) & 0x3f) | 0x80
        target[at++] = ((value >> 6) & 0x3f) | 0x80
      } else {
        // FIXME: do we care
        continue
      }

      target[at++] = (value & 0x3f) | 0x80
    }

    return target.slice(0, at)
  }

  /********************************************************/
  /*               String Decoder fallback                */
  /********************************************************/
  function stringDecode (buf) {
    var end = buf.length
    var res = []

    var i = 0
    while (i < end) {
      var firstByte = buf[i]
      var codePoint = null
      var bytesPerSequence =
        firstByte > 0xef ? 4 : firstByte > 0xdf ? 3 : firstByte > 0xbf ? 2 : 1

      if (i + bytesPerSequence <= end) {
        var secondByte, thirdByte, fourthByte, tempCodePoint

        switch (bytesPerSequence) {
          case 1:
            if (firstByte < 0x80) {
              codePoint = firstByte
            }
            break
          case 2:
            secondByte = buf[i + 1]
            if ((secondByte & 0xc0) === 0x80) {
              tempCodePoint = ((firstByte & 0x1f) << 0x6) | (secondByte & 0x3f)
              if (tempCodePoint > 0x7f) {
                codePoint = tempCodePoint
              }
            }
            break
          case 3:
            secondByte = buf[i + 1]
            thirdByte = buf[i + 2]
            if ((secondByte & 0xc0) === 0x80 && (thirdByte & 0xc0) === 0x80) {
              tempCodePoint =
                ((firstByte & 0xf) << 0xc) |
                ((secondByte & 0x3f) << 0x6) |
                (thirdByte & 0x3f)
              if (
                tempCodePoint > 0x7ff &&
                (tempCodePoint < 0xd800 || tempCodePoint > 0xdfff)
              ) {
                codePoint = tempCodePoint
              }
            }
            break
          case 4:
            secondByte = buf[i + 1]
            thirdByte = buf[i + 2]
            fourthByte = buf[i + 3]
            if (
              (secondByte & 0xc0) === 0x80 &&
              (thirdByte & 0xc0) === 0x80 &&
              (fourthByte & 0xc0) === 0x80
            ) {
              tempCodePoint =
                ((firstByte & 0xf) << 0x12) |
                ((secondByte & 0x3f) << 0xc) |
                ((thirdByte & 0x3f) << 0x6) |
                (fourthByte & 0x3f)
              if (tempCodePoint > 0xffff && tempCodePoint < 0x110000) {
                codePoint = tempCodePoint
              }
            }
        }
      }

      if (codePoint === null) {
        // we did not generate a valid codePoint so insert a
        // replacement char (U+FFFD) and advance only 1 byte
        codePoint = 0xfffd
        bytesPerSequence = 1
      } else if (codePoint > 0xffff) {
        // encode to utf16 (surrogate pair dance)
        codePoint -= 0x10000
        res.push(((codePoint >>> 10) & 0x3ff) | 0xd800)
        codePoint = 0xdc00 | (codePoint & 0x3ff)
      }

      res.push(codePoint)
      i += bytesPerSequence
    }

    var len = res.length
    var str = ""
    var i = 0

    while (i < len) {
      str += String.fromCharCode.apply(String, res.slice(i, (i += 0x1000)))
    }

    return str
  }

  // string -> buffer
  var textEncode =
    typeof TextEncoder === "function"
      ? TextEncoder.prototype.encode.bind(new TextEncoder())
      : stringEncode

  // buffer -> string
  var textDecode =
    typeof TextDecoder === "function"
      ? TextDecoder.prototype.decode.bind(new TextDecoder())
      : stringDecode

  function FakeBlobBuilder () {
    function isDataView (obj) {
      return obj && DataView.prototype.isPrototypeOf(obj)
    }
    function bufferClone (buf) {
      var view = new Array(buf.byteLength)
      var array = new Uint8Array(buf)
      var i = view.length
      while (i--) {
        view[i] = array[i]
      }
      return view
    }
    function array2base64 (input) {
      var byteToCharMap =
        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="

      var output = []

      for (var i = 0; i < input.length; i += 3) {
        var byte1 = input[i]
        var haveByte2 = i + 1 < input.length
        var byte2 = haveByte2 ? input[i + 1] : 0
        var haveByte3 = i + 2 < input.length
        var byte3 = haveByte3 ? input[i + 2] : 0

        var outByte1 = byte1 >> 2
        var outByte2 = ((byte1 & 0x03) << 4) | (byte2 >> 4)
        var outByte3 = ((byte2 & 0x0f) << 2) | (byte3 >> 6)
        var outByte4 = byte3 & 0x3f

        if (!haveByte3) {
          outByte4 = 64

          if (!haveByte2) {
            outByte3 = 64
          }
        }

        output.push(
          byteToCharMap[outByte1],
          byteToCharMap[outByte2],
          byteToCharMap[outByte3],
          byteToCharMap[outByte4]
        )
      }

      return output.join("")
    }

    var create =
      Object.create ||
      function (a) {
        function c () {}
        c.prototype = a
        return new c()
      }

    if (arrayBufferSupported) {
      var viewClasses = [
        "[object Int8Array]",
        "[object Uint8Array]",
        "[object Uint8ClampedArray]",
        "[object Int16Array]",
        "[object Uint16Array]",
        "[object Int32Array]",
        "[object Uint32Array]",
        "[object Float32Array]",
        "[object Float64Array]"
      ]

      var isArrayBufferView =
        ArrayBuffer.isView ||
        function (obj) {
          return (
            obj && viewClasses.indexOf(Object.prototype.toString.call(obj)) > -1
          )
        }
    }

    function concatTypedarrays (chunks) {
      var size = 0
      var i = chunks.length
      while (i--) {
        size += chunks[i].length
      }
      var b = new Uint8Array(size)
      var offset = 0
      for (i = 0, l = chunks.length; i < l; i++) {
        var chunk = chunks[i]
        b.set(chunk, offset)
        offset += chunk.byteLength || chunk.length
      }

      return b
    }

    /********************************************************/
    /*                   Blob constructor                   */
    /********************************************************/
    function Blob (chunks, opts) {
      chunks = chunks || []
      opts = opts == null ? {} : opts
      for (var i = 0, len = chunks.length; i < len; i++) {
        var chunk = chunks[i]
        if (chunk instanceof Blob) {
          chunks[i] = chunk._buffer
        } else if (typeof chunk === "string") {
          chunks[i] = textEncode(chunk)
        } else if (
          arrayBufferSupported &&
          (ArrayBuffer.prototype.isPrototypeOf(chunk) ||
            isArrayBufferView(chunk))
        ) {
          chunks[i] = bufferClone(chunk)
        } else if (arrayBufferSupported && isDataView(chunk)) {
          chunks[i] = bufferClone(chunk.buffer)
        } else {
          chunks[i] = textEncode(String(chunk))
        }
      }

      this._buffer = global.Uint8Array
        ? concatTypedarrays(chunks)
        : [].concat.apply([], chunks)
      this.size = this._buffer.length

      this.type = opts.type || ""
      if (/[^\u0020-\u007E]/.test(this.type)) {
        this.type = ""
      } else {
        this.type = this.type.toLowerCase()
      }
    }

    Blob.prototype.arrayBuffer = function () {
      return Promise.resolve(this._buffer)
    }

    Blob.prototype.text = function () {
      return Promise.resolve(textDecode(this._buffer))
    }

    Blob.prototype.slice = function (start, end, type) {
      var slice = this._buffer.slice(start || 0, end || this._buffer.length)
      return new Blob([slice], { type: type })
    }

    Blob.prototype.toString = function () {
      return "[object Blob]"
    }

    /********************************************************/
    /*                   File constructor                   */
    /********************************************************/
    function File (chunks, name, opts) {
      opts = opts || {}
      var a = Blob.call(this, chunks, opts) || this
      a.name = name.replace(/\//g, ":")
      a.lastModifiedDate = opts.lastModified
        ? new Date(opts.lastModified)
        : new Date()
      a.lastModified = +a.lastModifiedDate

      return a
    }

    File.prototype = create(Blob.prototype)
    File.prototype.constructor = File

    if (Object.setPrototypeOf) {
      Object.setPrototypeOf(File, Blob)
    } else {
      try {
        File.__proto__ = Blob
      } catch (e) {}
    }

    File.prototype.toString = function () {
      return "[object File]"
    }

    /********************************************************/
    /*                FileReader constructor                */
    /********************************************************/
    function FileReader () {
      if (!(this instanceof FileReader)) {
        throw new TypeError(
          "Failed to construct 'FileReader': Please use the 'new' operator, this DOM object constructor cannot be called as a function."
        )
      }

      var delegate = document.createDocumentFragment()
      this.addEventListener = delegate.addEventListener
      this.dispatchEvent = function (evt) {
        var local = this["on" + evt.type]
        if (typeof local === "function") local(evt)
        delegate.dispatchEvent(evt)
      }
      this.removeEventListener = delegate.removeEventListener
    }

    function _read (fr, blob, kind) {
      if (!(blob instanceof Blob)) {
        throw new TypeError(
          "Failed to execute '" +
            kind +
            "' on 'FileReader': parameter 1 is not of type 'Blob'."
        )
      }

      fr.result = ""

      setTimeout(function () {
        this.readyState = FileReader.LOADING
        fr.dispatchEvent(new Event("load"))
        fr.dispatchEvent(new Event("loadend"))
      })
    }

    FileReader.EMPTY = 0
    FileReader.LOADING = 1
    FileReader.DONE = 2
    FileReader.prototype.error = null
    FileReader.prototype.onabort = null
    FileReader.prototype.onerror = null
    FileReader.prototype.onload = null
    FileReader.prototype.onloadend = null
    FileReader.prototype.onloadstart = null
    FileReader.prototype.onprogress = null

    FileReader.prototype.readAsDataURL = function (blob) {
      _read(this, blob, "readAsDataURL")
      this.result =
        "data:" + blob.type + ";base64," + array2base64(blob._buffer)
    }

    FileReader.prototype.readAsText = function (blob) {
      _read(this, blob, "readAsText")
      this.result = textDecode(blob._buffer)
    }

    FileReader.prototype.readAsArrayBuffer = function (blob) {
      _read(this, blob, "readAsText")
      // return ArrayBuffer when possible
      this.result = (blob._buffer.buffer || blob._buffer).slice()
    }

    FileReader.prototype.abort = function () {}

    /********************************************************/
    /*                         URL                          */
    /********************************************************/
    URL.createObjectURL = function (blob) {
      return blob instanceof Blob
        ? "data:" + blob.type + ";base64," + array2base64(blob._buffer)
        : createObjectURL.call(URL, blob)
    }

    URL.revokeObjectURL = function (url) {
      revokeObjectURL && revokeObjectURL.call(URL, url)
    }

    /********************************************************/
    /*                         XHR                          */
    /********************************************************/
    var _send = global.XMLHttpRequest && global.XMLHttpRequest.prototype.send
    if (_send) {
      XMLHttpRequest.prototype.send = function (data) {
        if (data instanceof Blob) {
          this.setRequestHeader("Content-Type", data.type)
          _send.call(this, textDecode(data._buffer))
        } else {
          _send.call(this, data)
        }
      }
    }

    global.FileReader = FileReader
    global.File = File
    global.Blob = Blob
  }

  function fixFileAndXHR () {
    var isIE =
      !!global.ActiveXObject ||
      ("-ms-scroll-limit" in document.documentElement.style &&
        "-ms-ime-align" in document.documentElement.style)

    // Monkey patched
    // IE don't set Content-Type header on XHR whose body is a typed Blob
    // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/6047383
    var _send = global.XMLHttpRequest && global.XMLHttpRequest.prototype.send
    if (isIE && _send) {
      XMLHttpRequest.prototype.send = function (data) {
        if (data instanceof Blob) {
          this.setRequestHeader("Content-Type", data.type)
          _send.call(this, data)
        } else {
          _send.call(this, data)
        }
      }
    }

    try {
      new File([], "")
    } catch (e) {
      try {
        var klass = new Function(
          "class File extends Blob {" +
            "constructor(chunks, name, opts) {" +
            "opts = opts || {};" +
            "super(chunks, opts || {});" +
            "this.name = name.replace(///g, \":\");" +
            "this.lastModifiedDate = opts.lastModified ? new Date(opts.lastModified) : new Date();" +
            "this.lastModified = +this.lastModifiedDate;" +
            "}};" +
            "return new File([], \"\"), File"
        )()
        global.File = klass
      } catch (e) {
        var klass = function (b, d, c) {
          var blob = new Blob(b, c)
          var t =
            c && void 0 !== c.lastModified
              ? new Date(c.lastModified)
              : new Date()

          blob.name = d.replace(/\//g, ":")
          blob.lastModifiedDate = t
          blob.lastModified = +t
          blob.toString = function () {
            return "[object File]"
          }

          if (strTag) {
            blob[strTag] = "File"
          }

          return blob
        }
        global.File = klass
      }
    }
  }

  if (blobSupported) {
    fixFileAndXHR()
    global.Blob = blobSupportsArrayBufferView ? global.Blob : BlobConstructor
  } else if (blobBuilderSupported) {
    fixFileAndXHR()
    global.Blob = BlobBuilderConstructor
  } else {
    FakeBlobBuilder()
  }

  if (strTag) {
    File.prototype[strTag] = "File"
    Blob.prototype[strTag] = "Blob"
    FileReader.prototype[strTag] = "FileReader"
  }

  var blob = global.Blob.prototype
  var stream

  function promisify (obj) {
    return new Promise(function (resolve, reject) {
      obj.onload = obj.onerror = function (evt) {
        obj.onload = obj.onerror = null

        evt.type === "load"
          ? resolve(obj.result || obj)
          : reject(new Error("Failed to read the blob/file"))
      }
    })
  }

  try {
    new ReadableStream({ type: "bytes" })
    stream = function stream () {
      var position = 0
      var blob = this

      return new ReadableStream({
        type: "bytes",
        autoAllocateChunkSize: 524288,

        pull: function (controller) {
          var v = controller.byobRequest.view
          var chunk = blob.slice(position, position + v.byteLength)
          return chunk.arrayBuffer().then(function (buffer) {
            var uint8array = new Uint8Array(buffer)
            var bytesRead = uint8array.byteLength

            position += bytesRead
            v.set(uint8array)
            controller.byobRequest.respond(bytesRead)

            if (position >= blob.size) controller.close()
          })
        }
      })
    }
  } catch (e) {
    try {
      new ReadableStream({})
      stream = function stream (blob) {
        var position = 0
        var blob = this

        return new ReadableStream({
          pull: function (controller) {
            var chunk = blob.slice(position, position + 524288)

            return chunk.arrayBuffer().then(function (buffer) {
              position += buffer.byteLength
              var uint8array = new Uint8Array(buffer)
              controller.enqueue(uint8array)

              if (position == blob.size) controller.close()
            })
          }
        })
      }
    } catch (e) {
      try {
        new Response("").body.getReader().read()
        stream = function stream () {
          return new Response(this).body
        }
      } catch (e) {
        stream = function stream () {
          throw new Error(
            "Include https://github.com/MattiasBuelens/web-streams-polyfill"
          )
        }
      }
    }
  }

  if (!blob.arrayBuffer) {
    blob.arrayBuffer = function arrayBuffer () {
      var fr = new FileReader()
      fr.readAsArrayBuffer(this)
      return promisify(fr)
    }
  }

  if (!blob.text) {
    blob.text = function text () {
      var fr = new FileReader()
      fr.readAsText(this)
      return promisify(fr)
    }
  }

  if (!blob.stream) {
    blob.stream = stream
  }
})()