/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

const random = require('../random')
const make = require('../make')
const utils = require('../utils')

class text extends make {
  /**
   * Generate a random alphabetic character
   */
  static alpha () {
    return String.fromCharCode(random.range('A'.charCodeAt(0), 'z'.charCodeAt(0)))
  }

  /**
   * Generate a random alphanumeric character
   */
  static alphanum () {
    return String.fromCharCode(random.range('0'.charCodeAt(0), 'z'.charCodeAt(0)))
  }

  /**
   * Generate a random assignment operator
   */
  static assignmentOperator () {
    return random.pick([
      '=', '+=', '-=', '*=', '/=', '%=', '**=', '<<=', '>>=', '>>>=', '&=', '^=', '|='
    ])
  }

  /**
   * Generate a random arithmetic operator
   */
  static arithmeticOperator () {
    return random.pick([
      '%', '-', '+', '*', '/'
    ])
  }

  /**
   * Generate a random control character
   */
  static controlChar () {
    return random.pick([
      '\b', '\t', '\n', '\v', '\f', '\r', '\0', '\c', '\a', '\e' // eslint-disable-line no-useless-escape
    ])
  }

  /**
   * Generate a random digit
   */
  static digit () {
    return String.fromCharCode(random.range('0'.charCodeAt(0), '9'.charCodeAt(0)))
  }

  /**
   * Generate a random line ending
   */
  static lineEnd () {
    return random.pick([
      '\n', '\r', '\r\n', '\n\r'
    ])
  }

  /**
   * Generate a random token
   */
  static token () {
    return random.pick([
      '*', '+', '%', '-', '!', '^', ':', '|', '&', '<', '>', '.', '"',
      '#', ' ', ';', ',', '{', '}', '(', ')', '[', ']', '/', '\\', '/*', '*/'
    ])
  }

  static charset () {
    return random.pick([
      'UTF-8', 'ISO-8859-1'
    ])
  }

  static language () {
    return random.pick([
      // special casing for i, I, dotted/dotless variants
      ['tr', 'az', 'crh', 'tt', 'ba'],
      // special casing rules: https://developer.mozilla.org/en/CSS/text-transform
      ['nl', 'el', 'ga'],
      // special justification rules
      ['ja', 'zh'],
      // tend to be RTL
      ['ar', 'he'],
      // http://mxr.mozilla.org/mozilla-central/source/gfx/thebes/gfxAtomList.h
      ['en', 'x-unicode', 'x-western', 'ja', 'ko', 'zh-cn', 'zh-hk', 'zh-tw', 'x-cyrillic', 'el', 'tr', 'he', 'ar', 'x-baltic', 'th', 'x-devanagari', 'x-tamil', 'x-armn', 'x-beng', 'x-cans', 'x-ethi', 'x-geor', 'x-gujr', 'x-guru', 'x-khmr', 'x-knda', 'x-mlym', 'x-orya', 'x-sinh', 'x-telu', 'x-tibt', 'ko-xxx', 'x-central-euro', 'x-symbol', 'x-user-def', 'az', 'ba', 'crh', 'tt'],
      // Seen in mxr
      ['en-US', 'fr', 'fra', 'de', 'ru', 'en-us', 'is-IS', 'xyzzy']
    ])
  }

  /**
   * Generate a random character that may affect layout
   */
  static layoutCharCodes () {
    return String.fromCodePoint(
      random.pick([
        0, // null
        160, // non-breaking space
        0x005C, // backslash, but in some countries, represents local currency symbol (e.g. yen)
        0x00AD, // soft hyphen
        0x0BCC, // a Tamil character that is displayed as three glyphs
        // http://unicode.org/charts/PDF/U2000.pdf
        0x200B, // zero-width space
        0x200C, // zero-width non-joiner
        0x200D, // zero-width joiner
        0x200E, // left-to-right mark
        0x200F, // right-to-left mark
        0x2011, // non-breaking hyphen
        0x2027, // hyphenation point
        0x2028, // line separator
        0x2029, // paragraph separator
        0x202A, // left-to-right embedding
        0x202B, // right-to-left embedding
        0x202C, // pop directional formatting
        0x202D, // left-to-right override
        0x202E, // right-to-left override
        0x202F, // narrow no-break space
        0x2060, // word joiner
        0x2061, // function application (one of several invisible mathematical operators)
        // http://unicode.org/charts/PDF/U3000.pdf
        0x3000, // ideographic space (CJK)
        // http://unicode.org/charts/PDF/U0300.pdf
        0x0301, // combining acute accent (if it appears after "a", it turns into "a" with an accent)
        // Arabic has the interesting property that most letters connect to the next letter.
        // Some code calls this "shaping".
        0x0643, // arabic letter kaf
        0x0645, // arabic letter meem
        0x06CD, // arabic letter yeh with tail
        0xFDDE, // invalid unicode? but somehow associated with arabic.
        // http://unicode.org/reports/tr36/tr36-7.html#Buffer_Overflows
        // Characters with especially high expansion factors when they go through various unicode "normalizations"
        0x1F82,
        0xFDFA,
        0xFB2C,
        0x0390,
        // 0x1D160, // hmm, need surrogates
        // Characters with especially high expansion factors when lowercased or uppercased
        0x023A,
        0x0041,
        0xDC1D, // a low surrogate
        0xDB00, // a high surrogate
        // UFFF0.pdf
        0xFFF9, // interlinear annotation anchor
        0xFFFA, // interlinear annotation seperator
        0xFFFB, // interlinear annotation terminator
        0xFFFC, // object replacement character
        0xFFFD, // replacement character
        0xFEFF, // zero width no-break space
        0xFFFF, // not a character
        0x00A0, // no-break space
        0x2426,
        0x003F,
        0x00BF,
        0xDC80,
        0xDCFF,
        // http://en.wikipedia.org/wiki/Mapping_of_Unicode_characters
        0x205F, // mathematical space
        0x2061, // mathematical function application
        0x2064, // mathematical invisible separator
        0x2044 // fraction slash character
      ])
    )
  }

  /**
   * Generate a random character that affects bidi layout
   */
  static bidiCharCodes () {
    return String.fromCodePoint(
      random.pick([
        0x0660, // START_HINDI_DIGITS
        0x0669, // END_HINDI_DIGITS
        0x066A, // START_ARABIC_SEPARATOR
        0x066B, // END_ARABIC_SEPARATOR
        0x0030, // START_ARABIC_DIGITS
        0x0039, // END_ARABIC_DIGITS
        0x06f0, // START_FARSI_DIGITS
        0x06f9 // END_FARSI_DIGITS
      ])
    )
  }

  /**
   * Generate a random unicode combining character
   * http://www.unicode.org/Public/6.0.0/ucd/UnicodeData.txt
   */
  static unicodeCombiningCharacter () {
    return String.fromCodePoint(
      random.range(
        ...random.item([
          [0x0300, 0x036F], // Combining Diacritical Marks
          [0x0483, 0x0489],
          [0x07EB, 0x07F3],
          [0x135D, 0x135F],
          [0x1A7F, 0x1A7F],
          [0x1B6B, 0x1B73],
          [0x1DC0, 0x1DFF], // Combining Diacritical Marks Supplement
          [0x20D0, 0x2DFF],
          [0x3099, 0x309A],
          [0xA66F, 0xA6F1],
          [0xA8E0, 0xA8F1],
          [0xFE20, 0xFE26], // Combining Half Marks
          [0x101FD, 0x101FD],
          [0x1D165, 0x1D169],
          [0x1D16D, 0x1D172],
          [0x1D17B, 0x1D18B],
          [0x1D1AA, 0x1D1AD],
          [0x1D242, 0x1D244]
        ])
      )
    )
  }

  /**
   * Generate a random basic multilingual plane character
   */
  static unicodeBMP () {
    return String.fromCodePoint(
      random.range(0x0000, 0xFFFF)
    )
  }

  /**
   * Generate a random supplementary multilingual plane character
   */
  static unicodeSMP () {
    return String.fromCodePoint(
      random.range(
        ...random.item([
          [0x10000, 0x13FFF],
          [0x16000, 0x16FFF],
          [0x1B000, 0x1BFFF],
          [0x1D000, 0x1DFFF],
          [0x1F000, 0x1FFFF]
        ])
      )
    )
  }

  /**
   * Generate a random supplementary ideographic plane character
   */
  static unicodeSIP () {
    return String.fromCodePoint(
      random.range(
        ...random.item([
          [0x20000, 0x2BFFF],
          [0x2F000, 0x2FFFF]
        ])
      )
    )
  }

  /**
   * Generate a random supplementary special-purpose plane character
   */
  static unicodeSSP () {
    return String.fromCodePoint(
      random.range(0xE0000, 0xE0FFF)
    )
  }

  static currency () {
    return random.pick([
      // https://en.wikipedia.org/wiki/ISO_4217
      'USD', 'USS', 'USN', 'EUR', 'CHF', 'GBP', 'XAG', 'XBA', 'XBB', 'XBC',
      'XBD', 'XSU', 'XTS', 'XXX'
    ])
  }

  static fromBlocks (set, maxlen) {
    let s = ''

    for (let i = 0; i < random.number(maxlen || 255); i++) {
      s += random.pick(set)
    }

    return s
  }

  static quotedString () {
    return utils.common.quote(text.any())
  }

  /**
   * Wrapper for all text generators
   * @returns {string}
   */
  static random () {
    return random.choose([
      [1, text.alpha],
      [1, text.alphanum],
      [1, text.arithmeticOperator],
      [1, text.assignmentOperator],
      [1, text.controlChar],
      [1, text.digit],
      [1, text.lineEnd],
      [1, text.token],
      [3, text.layoutCharCodes],
      [3, text.bidiCharCodes],
      [3, text.unicodeCombiningCharacter],
      [3, text.unicodeBMP],
      [3, text.unicodeSMP],
      [3, text.unicodeSIP],
      [3, text.unicodeSSP]
    ])
  }

  /**
   * Generate a single character
   */
  static character () {
    return text.random().charAt(0)
  }

  /**
   * Generate string comprised of random generators
   */
  static any () {
    let s = ''
    let len = random.range(1, 126)

    while (len--) {
      s += make.text.random()
    }

    return s
  }
}

module.exports = text