// https://github.com/vangie/east-asian-width

// Copyright (c) 2015 Vangie Du
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.

// require('string.prototype.codepointat');
// var utils = require("./code_point_utils.js");

/*! http://mths.be/codepointat v0.2.0 by @mathias */
// https://github.com/mathiasbynens/String.prototype.codePointAt

// Copyright Mathias Bynens <https://mathiasbynens.be/>
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

if (!String.prototype.codePointAt) {
	(function() {
		'use strict'; // needed to support `apply`/`call` with `undefined`/`null`
		var defineProperty = (function() {
			// IE 8 only supports `Object.defineProperty` on DOM elements
			try {
				var object = {};
				var $defineProperty = Object.defineProperty;
				var result = $defineProperty(object, object, object) && $defineProperty;
			} catch(error) {}
			return result;
		}());
		var codePointAt = function(position) {
			if (this == null) {
				throw TypeError();
			}
			var string = String(this);
			var size = string.length;
			// `ToInteger`
			var index = position ? Number(position) : 0;
			if (index != index) { // better `isNaN`
				index = 0;
			}
			// Account for out-of-bounds indices:
			if (index < 0 || index >= size) {
				return undefined;
			}
			// Get the first code unit
			var first = string.charCodeAt(index);
			var second;
			if ( // check if it’s the start of a surrogate pair
				first >= 0xD800 && first <= 0xDBFF && // high surrogate
				size > index + 1 // there is a next code unit
			) {
				second = string.charCodeAt(index + 1);
				if (second >= 0xDC00 && second <= 0xDFFF) { // low surrogate
					// http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
					return (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
				}
			}
			return first;
		};
		if (defineProperty) {
			defineProperty(String.prototype, 'codePointAt', {
				'value': codePointAt,
				'configurable': true,
				'writable': true
			});
		} else {
			String.prototype.codePointAt = codePointAt;
		}
	}());
}

var utils = (function() {
/* sorted list of non-overlapping intervals of non-spacing characters */
/* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
var combining = [
[ 0x0300, 0x036F ], [ 0x0483, 0x0486 ], [ 0x0488, 0x0489 ],
[ 0x0591, 0x05BD ], [ 0x05BF, 0x05BF ], [ 0x05C1, 0x05C2 ],
[ 0x05C4, 0x05C5 ], [ 0x05C7, 0x05C7 ], [ 0x0600, 0x0603 ],
[ 0x0610, 0x0615 ], [ 0x064B, 0x065E ], [ 0x0670, 0x0670 ],
[ 0x06D6, 0x06E4 ], [ 0x06E7, 0x06E8 ], [ 0x06EA, 0x06ED ],
[ 0x070F, 0x070F ], [ 0x0711, 0x0711 ], [ 0x0730, 0x074A ],
[ 0x07A6, 0x07B0 ], [ 0x07EB, 0x07F3 ], [ 0x0901, 0x0902 ],
[ 0x093C, 0x093C ], [ 0x0941, 0x0948 ], [ 0x094D, 0x094D ],
[ 0x0951, 0x0954 ], [ 0x0962, 0x0963 ], [ 0x0981, 0x0981 ],
[ 0x09BC, 0x09BC ], [ 0x09C1, 0x09C4 ], [ 0x09CD, 0x09CD ],
[ 0x09E2, 0x09E3 ], [ 0x0A01, 0x0A02 ], [ 0x0A3C, 0x0A3C ],
[ 0x0A41, 0x0A42 ], [ 0x0A47, 0x0A48 ], [ 0x0A4B, 0x0A4D ],
[ 0x0A70, 0x0A71 ], [ 0x0A81, 0x0A82 ], [ 0x0ABC, 0x0ABC ],
[ 0x0AC1, 0x0AC5 ], [ 0x0AC7, 0x0AC8 ], [ 0x0ACD, 0x0ACD ],
[ 0x0AE2, 0x0AE3 ], [ 0x0B01, 0x0B01 ], [ 0x0B3C, 0x0B3C ],
[ 0x0B3F, 0x0B3F ], [ 0x0B41, 0x0B43 ], [ 0x0B4D, 0x0B4D ],
[ 0x0B56, 0x0B56 ], [ 0x0B82, 0x0B82 ], [ 0x0BC0, 0x0BC0 ],
[ 0x0BCD, 0x0BCD ], [ 0x0C3E, 0x0C40 ], [ 0x0C46, 0x0C48 ],
[ 0x0C4A, 0x0C4D ], [ 0x0C55, 0x0C56 ], [ 0x0CBC, 0x0CBC ],
[ 0x0CBF, 0x0CBF ], [ 0x0CC6, 0x0CC6 ], [ 0x0CCC, 0x0CCD ],
[ 0x0CE2, 0x0CE3 ], [ 0x0D41, 0x0D43 ], [ 0x0D4D, 0x0D4D ],
[ 0x0DCA, 0x0DCA ], [ 0x0DD2, 0x0DD4 ], [ 0x0DD6, 0x0DD6 ],
[ 0x0E31, 0x0E31 ], [ 0x0E34, 0x0E3A ], [ 0x0E47, 0x0E4E ],
[ 0x0EB1, 0x0EB1 ], [ 0x0EB4, 0x0EB9 ], [ 0x0EBB, 0x0EBC ],
[ 0x0EC8, 0x0ECD ], [ 0x0F18, 0x0F19 ], [ 0x0F35, 0x0F35 ],
[ 0x0F37, 0x0F37 ], [ 0x0F39, 0x0F39 ], [ 0x0F71, 0x0F7E ],
[ 0x0F80, 0x0F84 ], [ 0x0F86, 0x0F87 ], [ 0x0F90, 0x0F97 ],
[ 0x0F99, 0x0FBC ], [ 0x0FC6, 0x0FC6 ], [ 0x102D, 0x1030 ],
[ 0x1032, 0x1032 ], [ 0x1036, 0x1037 ], [ 0x1039, 0x1039 ],
[ 0x1058, 0x1059 ], [ 0x1160, 0x11FF ], [ 0x135F, 0x135F ],
[ 0x1712, 0x1714 ], [ 0x1732, 0x1734 ], [ 0x1752, 0x1753 ],
[ 0x1772, 0x1773 ], [ 0x17B4, 0x17B5 ], [ 0x17B7, 0x17BD ],
[ 0x17C6, 0x17C6 ], [ 0x17C9, 0x17D3 ], [ 0x17DD, 0x17DD ],
[ 0x180B, 0x180D ], [ 0x18A9, 0x18A9 ], [ 0x1920, 0x1922 ],
[ 0x1927, 0x1928 ], [ 0x1932, 0x1932 ], [ 0x1939, 0x193B ],
[ 0x1A17, 0x1A18 ], [ 0x1B00, 0x1B03 ], [ 0x1B34, 0x1B34 ],
[ 0x1B36, 0x1B3A ], [ 0x1B3C, 0x1B3C ], [ 0x1B42, 0x1B42 ],
[ 0x1B6B, 0x1B73 ], [ 0x1DC0, 0x1DCA ], [ 0x1DFE, 0x1DFF ],
[ 0x200B, 0x200F ], [ 0x202A, 0x202E ], [ 0x2060, 0x2063 ],
[ 0x206A, 0x206F ], [ 0x20D0, 0x20EF ], [ 0x302A, 0x302F ],
[ 0x3099, 0x309A ], [ 0xA806, 0xA806 ], [ 0xA80B, 0xA80B ],
[ 0xA825, 0xA826 ], [ 0xFB1E, 0xFB1E ], [ 0xFE00, 0xFE0F ],
[ 0xFE20, 0xFE23 ], [ 0xFEFF, 0xFEFF ], [ 0xFFF9, 0xFFFB ],
[ 0x10A01, 0x10A03 ], [ 0x10A05, 0x10A06 ], [ 0x10A0C, 0x10A0F ],
[ 0x10A38, 0x10A3A ], [ 0x10A3F, 0x10A3F ], [ 0x1D167, 0x1D169 ],
[ 0x1D173, 0x1D182 ], [ 0x1D185, 0x1D18B ], [ 0x1D1AA, 0x1D1AD ],
[ 0x1D242, 0x1D244 ], [ 0xE0001, 0xE0001 ], [ 0xE0020, 0xE007F ],
[ 0xE0100, 0xE01EF ]
];

/* sorted list of non-overlapping intervals of East Asian Ambiguous
 * characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c" */
var ambiguous = [
[ 0x00A1, 0x00A1 ], [ 0x00A4, 0x00A4 ], [ 0x00A7, 0x00A8 ],
[ 0x00AA, 0x00AA ], [ 0x00AE, 0x00AE ], [ 0x00B0, 0x00B4 ],
[ 0x00B6, 0x00BA ], [ 0x00BC, 0x00BF ], [ 0x00C6, 0x00C6 ],
[ 0x00D0, 0x00D0 ], [ 0x00D7, 0x00D8 ], [ 0x00DE, 0x00E1 ],
[ 0x00E6, 0x00E6 ], [ 0x00E8, 0x00EA ], [ 0x00EC, 0x00ED ],
[ 0x00F0, 0x00F0 ], [ 0x00F2, 0x00F3 ], [ 0x00F7, 0x00FA ],
[ 0x00FC, 0x00FC ], [ 0x00FE, 0x00FE ], [ 0x0101, 0x0101 ],
[ 0x0111, 0x0111 ], [ 0x0113, 0x0113 ], [ 0x011B, 0x011B ],
[ 0x0126, 0x0127 ], [ 0x012B, 0x012B ], [ 0x0131, 0x0133 ],
[ 0x0138, 0x0138 ], [ 0x013F, 0x0142 ], [ 0x0144, 0x0144 ],
[ 0x0148, 0x014B ], [ 0x014D, 0x014D ], [ 0x0152, 0x0153 ],
[ 0x0166, 0x0167 ], [ 0x016B, 0x016B ], [ 0x01CE, 0x01CE ],
[ 0x01D0, 0x01D0 ], [ 0x01D2, 0x01D2 ], [ 0x01D4, 0x01D4 ],
[ 0x01D6, 0x01D6 ], [ 0x01D8, 0x01D8 ], [ 0x01DA, 0x01DA ],
[ 0x01DC, 0x01DC ], [ 0x0251, 0x0251 ], [ 0x0261, 0x0261 ],
[ 0x02C4, 0x02C4 ], [ 0x02C7, 0x02C7 ], [ 0x02C9, 0x02CB ],
[ 0x02CD, 0x02CD ], [ 0x02D0, 0x02D0 ], [ 0x02D8, 0x02DB ],
[ 0x02DD, 0x02DD ], [ 0x02DF, 0x02DF ], [ 0x0391, 0x03A1 ],
[ 0x03A3, 0x03A9 ], [ 0x03B1, 0x03C1 ], [ 0x03C3, 0x03C9 ],
[ 0x0401, 0x0401 ], [ 0x0410, 0x044F ], [ 0x0451, 0x0451 ],
[ 0x2010, 0x2010 ], [ 0x2013, 0x2016 ], [ 0x2018, 0x2019 ],
[ 0x201C, 0x201D ], [ 0x2020, 0x2022 ], [ 0x2024, 0x2027 ],
[ 0x2030, 0x2030 ], [ 0x2032, 0x2033 ], [ 0x2035, 0x2035 ],
[ 0x203B, 0x203B ], [ 0x203E, 0x203E ], [ 0x2074, 0x2074 ],
[ 0x207F, 0x207F ], [ 0x2081, 0x2084 ], [ 0x20AC, 0x20AC ],
[ 0x2103, 0x2103 ], [ 0x2105, 0x2105 ], [ 0x2109, 0x2109 ],
[ 0x2113, 0x2113 ], [ 0x2116, 0x2116 ], [ 0x2121, 0x2122 ],
[ 0x2126, 0x2126 ], [ 0x212B, 0x212B ], [ 0x2153, 0x2154 ],
[ 0x215B, 0x215E ], [ 0x2160, 0x216B ], [ 0x2170, 0x2179 ],
[ 0x2190, 0x2199 ], [ 0x21B8, 0x21B9 ], [ 0x21D2, 0x21D2 ],
[ 0x21D4, 0x21D4 ], [ 0x21E7, 0x21E7 ], [ 0x2200, 0x2200 ],
[ 0x2202, 0x2203 ], [ 0x2207, 0x2208 ], [ 0x220B, 0x220B ],
[ 0x220F, 0x220F ], [ 0x2211, 0x2211 ], [ 0x2215, 0x2215 ],
[ 0x221A, 0x221A ], [ 0x221D, 0x2220 ], [ 0x2223, 0x2223 ],
[ 0x2225, 0x2225 ], [ 0x2227, 0x222C ], [ 0x222E, 0x222E ],
[ 0x2234, 0x2237 ], [ 0x223C, 0x223D ], [ 0x2248, 0x2248 ],
[ 0x224C, 0x224C ], [ 0x2252, 0x2252 ], [ 0x2260, 0x2261 ],
[ 0x2264, 0x2267 ], [ 0x226A, 0x226B ], [ 0x226E, 0x226F ],
[ 0x2282, 0x2283 ], [ 0x2286, 0x2287 ], [ 0x2295, 0x2295 ],
[ 0x2299, 0x2299 ], [ 0x22A5, 0x22A5 ], [ 0x22BF, 0x22BF ],
[ 0x2312, 0x2312 ], [ 0x2460, 0x24E9 ], [ 0x24EB, 0x254B ],
[ 0x2550, 0x2573 ], [ 0x2580, 0x258F ], [ 0x2592, 0x2595 ],
[ 0x25A0, 0x25A1 ], [ 0x25A3, 0x25A9 ], [ 0x25B2, 0x25B3 ],
[ 0x25B6, 0x25B7 ], [ 0x25BC, 0x25BD ], [ 0x25C0, 0x25C1 ],
[ 0x25C6, 0x25C8 ], [ 0x25CB, 0x25CB ], [ 0x25CE, 0x25D1 ],
[ 0x25E2, 0x25E5 ], [ 0x25EF, 0x25EF ], [ 0x2605, 0x2606 ],
[ 0x2609, 0x2609 ], [ 0x260E, 0x260F ], [ 0x2614, 0x2615 ],
[ 0x261C, 0x261C ], [ 0x261E, 0x261E ], [ 0x2640, 0x2640 ],
[ 0x2642, 0x2642 ], [ 0x2660, 0x2661 ], [ 0x2663, 0x2665 ],
[ 0x2667, 0x266A ], [ 0x266C, 0x266D ], [ 0x266F, 0x266F ],
[ 0x273D, 0x273D ], [ 0x2776, 0x277F ], [ 0xE000, 0xF8FF ],
[ 0xFFFD, 0xFFFD ], [ 0xF0000, 0xFFFFD ], [ 0x100000, 0x10FFFD ]
];

/* auxiliary function for binary search in interval table */
function binary_search(code_point, table){
    var min = 0, mid, max = table.length - 1;

    if(code_point < table[0][0] || code_point > table[max][1]){
        return false;
    }

    while(max >= min) {
        // integer division
        mid = ~~((min + max) / 2);
        if(code_point > table[mid][1]){
            min = mid + 1;
        }else if( code_point < table[mid][0]){
            max = mid - 1;
        }else{
            return true;
        }
    }

    return false;
}

function is_non_spacing(code_point) {
    return binary_search(code_point, combining);
}

function is_ambiguous(code_point) {
    return binary_search(code_point, ambiguous);
}

return {
    is_non_spacing:is_non_spacing,
    is_ambiguous:is_ambiguous
};
})();

/* The following two functions define the column width of an ISO 10646
 * character as follows:
 *
 *    - The null character (U+0000) has a column width of 0.
 *
 *    - Other C0/C1 control characters and DEL will lead to a return
 *      value of 2.
 *
 *    - Non-spacing and enclosing combining characters (general
 *      category code Mn or Me in the Unicode database) have a
 *      column width of 0.
 *
 *    - SOFT HYPHEN (U+00AD) has a column width of 1.
 *
 *    - Other format characters (general category code Cf in the Unicode
 *      database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
 *
 *    - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
 *      have a column width of 0.
 *
 *    - Spacing characters in the East Asian Wide (W) or East Asian
 *      Full-width (F) category as defined in Unicode Technical
 *      Report #11 have a column width of 2.
 *
 *    - All remaining characters (including all printable
 *      ISO 8859-1 and WGL4 characters, Unicode control characters,
 *      etc.) have a column width of 1.
 *
 * This implementation assumes that code_point of characters are encoded
 * in ISO 10646.
 */
function char_width(code_point) {

  if (typeof code_point !== 'number') {
    throw "'code_point' must be type of number!"
  }

  // null
  if (code_point === 0) {
    return 0;
  }

  // 8-bit control characters
  if (code_point < 32 || (code_point >= 0x7f && code_point < 0xa0)) {
    return 2;
  }

  // binary search in table of non-spacing characters
  if (utils.is_non_spacing(code_point)) {
    return 0;
  }

  // if we arrive here, ucs is not a combining or C0/C1 control character
  if (code_point >= 0x1100 &&
    (code_point <= 0x115f || /* Hangul Jamo init. consonants */
    code_point == 0x2329 || code_point == 0x232a ||
    (code_point >= 0x2e80 && code_point <= 0xa4cf &&
    code_point != 0x303f) || /* CJK ... Yi */
    (code_point >= 0xac00 && code_point <= 0xd7a3) || /* Hangul Syllables */
    (code_point >= 0xf900 && code_point <= 0xfaff) || /* CJK Compatibility Ideographs */
    (code_point >= 0xfe10 && code_point <= 0xfe19) || /* Vertical forms */
    (code_point >= 0xfe30 && code_point <= 0xfe6f) || /* CJK Compatibility Forms */
    (code_point >= 0xff00 && code_point <= 0xff60) || /* Fullwidth Forms */
    (code_point >= 0xffe0 && code_point <= 0xffe6) ||
    (code_point >= 0x20000 && code_point <= 0x2fffd) ||
    (code_point >= 0x30000 && code_point <= 0x3fffd))) {
    return 2;
  }

  return 1;

}

function str_width(str) {

  if (typeof str !== 'string') {
    throw "'str' must be type of string!"
  }

  var i, len = str.length, code_point, width = 0;

  for (i = 0; i < len; i++) {
    code_point = str.codePointAt(i);
    width += char_width(code_point);
  }

  return width;
}

/*
 * The following functions are the same as cjk_char_width() and
 * cjk_str_width(), except that spacing characters in the East Asian
 * Ambiguous (A) category as defined in Unicode Technical Report #11
 * have a column width of 2. This variant might be useful for users of
 * CJK legacy encodings who want to migrate to UCS without changing
 * the traditional terminal character-width behaviour. It is not
 * otherwise recommended for general use.
 */
function cjk_char_width(code_point) {

  if (typeof code_point !== 'number') {
    throw "'code_point' must be type of number!"
  }

  if (utils.is_ambiguous(code_point)) {
    return 2;
  }

  return char_width(code_point);
}

function cjk_str_width(str) {

  if (typeof str !== 'string') {
    throw "'str' must be type of string!"
  }

  var i, len = str.length, code_point, width = 0;

  for (i = 0; i < len; i++) {
    code_point = str.codePointAt(i);
    width += cjk_char_width(code_point);
  }

  return width;
}

module.exports = {
  char_width: char_width,
  str_width: str_width,
  cjk_char_width: cjk_char_width,
  cjk_str_width: cjk_str_width
}