import Utils from '../core/Utils';
import Uint8Array from 'core-js/modules/es6.typed.uint8-array';

/* globals Zlib, bzip2 */

/**
 * Compression operations.
 *
 * @author n1474335 [n1474335@gmail.com]
 * @copyright Crown Copyright 2016
 * @license Apache-2.0
 *
 * @namespace
 */
const Compress = {

    /**
     * @constant
     * @default
     */
  COMPRESSION_TYPE: ['Dynamic Huffman Coding', 'Fixed Huffman Coding', 'None (Store)'],
    /**
     * @constant
     * @default
     */
  INFLATE_BUFFER_TYPE: ['Adaptive', 'Block'],
    /**
     * @constant
     * @default
     */
  COMPRESSION_METHOD: ['Deflate', 'None (Store)'],
    /**
     * @constant
     * @default
     */
  OS: ['MSDOS', 'Unix', 'Macintosh'],
    /**
     * @constant
     * @default
     */
  RAW_COMPRESSION_TYPE_LOOKUP: {
    'Fixed Huffman Coding': Zlib.RawDeflate.CompressionType.FIXED,
    'Dynamic Huffman Coding': Zlib.RawDeflate.CompressionType.DYNAMIC,
    'None (Store)': Zlib.RawDeflate.CompressionType.NONE,
  },

    /**
     * Raw Deflate operation.
     *
     * @param {byte_array} input
     * @param {Object[]} args
     * @returns {byte_array}
     */
  run_raw_deflate(input, args) {
    const deflate = new Zlib.RawDeflate(input, {
      compressionType: Compress.RAW_COMPRESSION_TYPE_LOOKUP[args[0]],
    });
    return Array.prototype.slice.call(deflate.compress());
  },


    /**
     * @constant
     * @default
     */
  INFLATE_INDEX: 0,
    /**
     * @constant
     * @default
     */
  INFLATE_BUFFER_SIZE: 0,
    /**
     * @constant
     * @default
     */
  INFLATE_RESIZE: false,
    /**
     * @constant
     * @default
     */
  INFLATE_VERIFY: false,
    /**
     * @constant
     * @default
     */
  RAW_BUFFER_TYPE_LOOKUP: {
    Adaptive: Zlib.RawInflate.BufferType.ADAPTIVE,
    Block: Zlib.RawInflate.BufferType.BLOCK,
  },

    /**
     * Raw Inflate operation.
     *
     * @param {byte_array} input
     * @param {Object[]} args
     * @returns {byte_array}
     */
  run_raw_inflate(input, args) {
        // Deal with character encoding issues
    input = Utils.str_to_byte_array(Utils.byte_array_to_utf8(input));
    let inflate = new Zlib.RawInflate(input, {
        index: args[0],
        bufferSize: args[1],
        bufferType: Compress.RAW_BUFFER_TYPE_LOOKUP[args[2]],
        resize: args[3],
        verify: args[4],
      }),
      result = Array.prototype.slice.call(inflate.decompress());

        // Raw Inflate somethimes messes up and returns nonsense like this:
        // ]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]...
        // e.g. Input data of [8b, 1d, dc, 44]
        // Look for the first two square brackets:
    if (result.length > 158 && result[0] == 93 && result[5] == 93) {
            // If the first two square brackets are there, check that the others
            // are also there. If they are, throw an error. If not, continue.
      let valid = false;
      for (let i = 0; i < 155; i += 5) {
        if (result[i] != 93) {
          valid = true;
        }
      }

      if (!valid) {
        throw 'Error: Unable to inflate data';
      }
    }
        // Trust me, this is the easiest way...
    return result;
  },


    /**
     * @constant
     * @default
     */
  ZLIB_COMPRESSION_TYPE_LOOKUP: {
    'Fixed Huffman Coding': Zlib.Deflate.CompressionType.FIXED,
    'Dynamic Huffman Coding': Zlib.Deflate.CompressionType.DYNAMIC,
    'None (Store)': Zlib.Deflate.CompressionType.NONE,
  },

    /**
     * Zlib Deflate operation.
     *
     * @param {byte_array} input
     * @param {Object[]} args
     * @returns {byte_array}
     */
  run_zlib_deflate(input, args) {
    const deflate = new Zlib.Deflate(input, {
      compressionType: Compress.ZLIB_COMPRESSION_TYPE_LOOKUP[args[0]],
    });
    return Array.prototype.slice.call(deflate.compress());
  },


    /**
     * @constant
     * @default
     */
  ZLIB_BUFFER_TYPE_LOOKUP: {
    Adaptive: Zlib.Inflate.BufferType.ADAPTIVE,
    Block: Zlib.Inflate.BufferType.BLOCK,
  },

    /**
     * Zlib Inflate operation.
     *
     * @param {byte_array} input
     * @param {Object[]} args
     * @returns {byte_array}
     */
  run_zlib_inflate(input, args) {
        // Deal with character encoding issues
    input = Utils.str_to_byte_array(Utils.byte_array_to_utf8(input));
    const inflate = new Zlib.Inflate(input, {
      index: args[0],
      bufferSize: args[1],
      bufferType: Compress.ZLIB_BUFFER_TYPE_LOOKUP[args[2]],
      resize: args[3],
      verify: args[4],
    });
    return Array.prototype.slice.call(inflate.decompress());
  },


    /**
     * @constant
     * @default
     */
  GZIP_CHECKSUM: false,

    /**
     * Gzip operation.
     *
     * @param {byte_array} input
     * @param {Object[]} args
     * @returns {byte_array}
     */
  run_gzip(input, args) {
    let filename = args[1],
      comment = args[2],
      options = {
        deflateOptions: {
          compressionType: Compress.ZLIB_COMPRESSION_TYPE_LOOKUP[args[0]],
        },
        flags: {
          fhcrc: args[3],
        },
      };

    if (filename.length) {
      options.flags.fname = true;
      options.filename = filename;
    }
    if (comment.length) {
      options.flags.fcommenct = true;
      options.comment = comment;
    }

    const gzip = new Zlib.Gzip(input, options);
    return Array.prototype.slice.call(gzip.compress());
  },


    /**
     * Gunzip operation.
     *
     * @param {byte_array} input
     * @param {Object[]} args
     * @returns {byte_array}
     */
  run_gunzip(input, args) {
        // Deal with character encoding issues
    input = Utils.str_to_byte_array(Utils.byte_array_to_utf8(input));
    const gunzip = new Zlib.Gunzip(input);
    return Array.prototype.slice.call(gunzip.decompress());
  },


    /**
     * @constant
     * @default
     */
  PKZIP_FILENAME: 'file.txt',
    /**
     * @constant
     * @default
     */
  ZIP_COMPRESSION_METHOD_LOOKUP: {
    Deflate: Zlib.Zip.CompressionMethod.DEFLATE,
    'None (Store)': Zlib.Zip.CompressionMethod.STORE,
  },
    /**
     * @constant
     * @default
     */
  ZIP_OS_LOOKUP: {
    MSDOS: Zlib.Zip.OperatingSystem.MSDOS,
    Unix: Zlib.Zip.OperatingSystem.UNIX,
    Macintosh: Zlib.Zip.OperatingSystem.MACINTOSH,
  },

    /**
     * Zip operation.
     *
     * @param {byte_array} input
     * @param {Object[]} args
     * @returns {byte_array}
     */
  run_pkzip(input, args) {
    let password = Utils.str_to_byte_array(args[2]),
      options = {
        filename: Utils.str_to_byte_array(args[0]),
        comment: Utils.str_to_byte_array(args[1]),
        compressionMethod: Compress.ZIP_COMPRESSION_METHOD_LOOKUP[args[3]],
        os: Compress.ZIP_OS_LOOKUP[args[4]],
        deflateOption: {
          compressionType: Compress.ZLIB_COMPRESSION_TYPE_LOOKUP[args[5]],
        },
      },
      zip = new Zlib.Zip();

    if (password.length) { zip.setPassword(password); }
    zip.addFile(input, options);
    return Array.prototype.slice.call(zip.compress());
  },


    /**
     * @constant
     * @default
     */
  PKUNZIP_VERIFY: false,

    /**
     * Unzip operation.
     *
     * @param {byte_array} input
     * @param {Object[]} args
     * @returns {string}
     */
  run_pkunzip(input, args) {
    let options = {
        password: Utils.str_to_byte_array(args[0]),
        verify: args[1],
      },
      file = '',
      unzip = new Zlib.Unzip(input, options),
      filenames = unzip.getFilenames(),
      output = `<div style='padding: 5px;'>${filenames.length} file(s) found</div>\n`;

    output += "<div class='panel-group' id='zip-accordion' role='tablist' aria-multiselectable='true'>";

    window.uzip = unzip;
    for (let i = 0; i < filenames.length; i++) {
      file = Utils.byte_array_to_utf8(unzip.decompress(filenames[i]));
      output += `${"<div class='panel panel-default'>" +
                "<div class='panel-heading' role='tab' id='heading"}${i}'>` +
                '<h4 class=\'panel-title\'>' +
                `<a class='collapsed' role='button' data-toggle='collapse' data-parent='#zip-accordion' href='#collapse${i
                }' aria-expanded='true' aria-controls='collapse${i}'>${
                filenames[i]}<span class='pull-right'>${file.length.toLocaleString()} bytes</span></a></h4></div>` +
                `<div id='collapse${i}' class='panel-collapse collapse' role='tabpanel' aria-labelledby='heading${i}'>` +
                `<div class='panel-body'>${
                Utils.escape_html(file)}</div></div></div>`;
    }

    return `${output}</div>`;
  },


    /**
     * Bzip2 Decompress operation.
     *
     * @param {byte_array} input
     * @param {Object[]} args
     * @returns {string}
     */
  run_bzip2_decompress(input, args) {
    let compressed = new Uint8Array(input),
      bzip2_reader,
      plain = '';

    bzip2_reader = bzip2.array(compressed);
    plain = bzip2.simple(bzip2_reader);
    return plain;
  },

};

export default Compress;