# modules/arabic.js

    /**
     * @license
     * Copyright (c) 2017 Aras Abbasi
     *
     * Licensed under the MIT License.
     * http://opensource.org/licenses/mit-license
     */

    import { jsPDF } from "../jspdf.js";

    /**
     * jsPDF arabic parser PlugIn
     *
     * @name arabic
     * @module
     */
    (function(jsPDFAPI) {
      "use strict";

      /**
       * Arabic shape substitutions: char code => (isolated, final, initial, medial).
       * Arabic Substition A
       */
      var arabicSubstitionA = {
        0x0621: [0xfe80], // ARABIC LETTER HAMZA
        0x0622: [0xfe81, 0xfe82], // ARABIC LETTER ALEF WITH MADDA ABOVE
        0x0623: [0xfe83, 0xfe84], // ARABIC LETTER ALEF WITH HAMZA ABOVE
        0x0624: [0xfe85, 0xfe86], // ARABIC LETTER WAW WITH HAMZA ABOVE
        0x0625: [0xfe87, 0xfe88], // ARABIC LETTER ALEF WITH HAMZA BELOW
        0x0626: [0xfe89, 0xfe8a, 0xfe8b, 0xfe8c], // ARABIC LETTER YEH WITH HAMZA ABOVE
        0x0627: [0xfe8d, 0xfe8e], // ARABIC LETTER ALEF
        0x0628: [0xfe8f, 0xfe90, 0xfe91, 0xfe92], // ARABIC LETTER BEH
        0x0629: [0xfe93, 0xfe94], // ARABIC LETTER TEH MARBUTA
        0x062a: [0xfe95, 0xfe96, 0xfe97, 0xfe98], // ARABIC LETTER TEH
        0x062b: [0xfe99, 0xfe9a, 0xfe9b, 0xfe9c], // ARABIC LETTER THEH
        0x062c: [0xfe9d, 0xfe9e, 0xfe9f, 0xfea0], // ARABIC LETTER JEEM
        0x062d: [0xfea1, 0xfea2, 0xfea3, 0xfea4], // ARABIC LETTER HAH
        0x062e: [0xfea5, 0xfea6, 0xfea7, 0xfea8], // ARABIC LETTER KHAH
        0x062f: [0xfea9, 0xfeaa], // ARABIC LETTER DAL
        0x0630: [0xfeab, 0xfeac], // ARABIC LETTER THAL
        0x0631: [0xfead, 0xfeae], // ARABIC LETTER REH
        0x0632: [0xfeaf, 0xfeb0], // ARABIC LETTER ZAIN
        0x0633: [0xfeb1, 0xfeb2, 0xfeb3, 0xfeb4], // ARABIC LETTER SEEN
        0x0634: [0xfeb5, 0xfeb6, 0xfeb7, 0xfeb8], // ARABIC LETTER SHEEN
        0x0635: [0xfeb9, 0xfeba, 0xfebb, 0xfebc], // ARABIC LETTER SAD
        0x0636: [0xfebd, 0xfebe, 0xfebf, 0xfec0], // ARABIC LETTER DAD
        0x0637: [0xfec1, 0xfec2, 0xfec3, 0xfec4], // ARABIC LETTER TAH
        0x0638: [0xfec5, 0xfec6, 0xfec7, 0xfec8], // ARABIC LETTER ZAH
        0x0639: [0xfec9, 0xfeca, 0xfecb, 0xfecc], // ARABIC LETTER AIN
        0x063a: [0xfecd, 0xfece, 0xfecf, 0xfed0], // ARABIC LETTER GHAIN
        0x0641: [0xfed1, 0xfed2, 0xfed3, 0xfed4], // ARABIC LETTER FEH
        0x0642: [0xfed5, 0xfed6, 0xfed7, 0xfed8], // ARABIC LETTER QAF
        0x0643: [0xfed9, 0xfeda, 0xfedb, 0xfedc], // ARABIC LETTER KAF
        0x0644: [0xfedd, 0xfede, 0xfedf, 0xfee0], // ARABIC LETTER LAM
        0x0645: [0xfee1, 0xfee2, 0xfee3, 0xfee4], // ARABIC LETTER MEEM
        0x0646: [0xfee5, 0xfee6, 0xfee7, 0xfee8], // ARABIC LETTER NOON
        0x0647: [0xfee9, 0xfeea, 0xfeeb, 0xfeec], // ARABIC LETTER HEH
        0x0648: [0xfeed, 0xfeee], // ARABIC LETTER WAW
        0x0649: [0xfeef, 0xfef0, 64488, 64489], // ARABIC LETTER ALEF MAKSURA
        0x064a: [0xfef1, 0xfef2, 0xfef3, 0xfef4], // ARABIC LETTER YEH
        0x0671: [0xfb50, 0xfb51], // ARABIC LETTER ALEF WASLA
        0x0677: [0xfbdd], // ARABIC LETTER U WITH HAMZA ABOVE
        0x0679: [0xfb66, 0xfb67, 0xfb68, 0xfb69], // ARABIC LETTER TTEH
        0x067a: [0xfb5e, 0xfb5f, 0xfb60, 0xfb61], // ARABIC LETTER TTEHEH
        0x067b: [0xfb52, 0xfb53, 0xfb54, 0xfb55], // ARABIC LETTER BEEH
        0x067e: [0xfb56, 0xfb57, 0xfb58, 0xfb59], // ARABIC LETTER PEH
        0x067f: [0xfb62, 0xfb63, 0xfb64, 0xfb65], // ARABIC LETTER TEHEH
        0x0680: [0xfb5a, 0xfb5b, 0xfb5c, 0xfb5d], // ARABIC LETTER BEHEH
        0x0683: [0xfb76, 0xfb77, 0xfb78, 0xfb79], // ARABIC LETTER NYEH
        0x0684: [0xfb72, 0xfb73, 0xfb74, 0xfb75], // ARABIC LETTER DYEH
        0x0686: [0xfb7a, 0xfb7b, 0xfb7c, 0xfb7d], // ARABIC LETTER TCHEH
        0x0687: [0xfb7e, 0xfb7f, 0xfb80, 0xfb81], // ARABIC LETTER TCHEHEH
        0x0688: [0xfb88, 0xfb89], // ARABIC LETTER DDAL
        0x068c: [0xfb84, 0xfb85], // ARABIC LETTER DAHAL
        0x068d: [0xfb82, 0xfb83], // ARABIC LETTER DDAHAL
        0x068e: [0xfb86, 0xfb87], // ARABIC LETTER DUL
        0x0691: [0xfb8c, 0xfb8d], // ARABIC LETTER RREH
        0x0698: [0xfb8a, 0xfb8b], // ARABIC LETTER JEH
        0x06a4: [0xfb6a, 0xfb6b, 0xfb6c, 0xfb6d], // ARABIC LETTER VEH
        0x06a6: [0xfb6e, 0xfb6f, 0xfb70, 0xfb71], // ARABIC LETTER PEHEH
        0x06a9: [0xfb8e, 0xfb8f, 0xfb90, 0xfb91], // ARABIC LETTER KEHEH
        0x06ad: [0xfbd3, 0xfbd4, 0xfbd5, 0xfbd6], // ARABIC LETTER NG
        0x06af: [0xfb92, 0xfb93, 0xfb94, 0xfb95], // ARABIC LETTER GAF
        0x06b1: [0xfb9a, 0xfb9b, 0xfb9c, 0xfb9d], // ARABIC LETTER NGOEH
        0x06b3: [0xfb96, 0xfb97, 0xfb98, 0xfb99], // ARABIC LETTER GUEH
        0x06ba: [0xfb9e, 0xfb9f], // ARABIC LETTER NOON GHUNNA
        0x06bb: [0xfba0, 0xfba1, 0xfba2, 0xfba3], // ARABIC LETTER RNOON
        0x06be: [0xfbaa, 0xfbab, 0xfbac, 0xfbad], // ARABIC LETTER HEH DOACHASHMEE
        0x06c0: [0xfba4, 0xfba5], // ARABIC LETTER HEH WITH YEH ABOVE
        0x06c1: [0xfba6, 0xfba7, 0xfba8, 0xfba9], // ARABIC LETTER HEH GOAL
        0x06c5: [0xfbe0, 0xfbe1], // ARABIC LETTER KIRGHIZ OE
        0x06c6: [0xfbd9, 0xfbda], // ARABIC LETTER OE
        0x06c7: [0xfbd7, 0xfbd8], // ARABIC LETTER U
        0x06c8: [0xfbdb, 0xfbdc], // ARABIC LETTER YU
        0x06c9: [0xfbe2, 0xfbe3], // ARABIC LETTER KIRGHIZ YU
        0x06cb: [0xfbde, 0xfbdf], // ARABIC LETTER VE
        0x06cc: [0xfbfc, 0xfbfd, 0xfbfe, 0xfbff], // ARABIC LETTER FARSI YEH
        0x06d0: [0xfbe4, 0xfbe5, 0xfbe6, 0xfbe7], //ARABIC LETTER E
        0x06d2: [0xfbae, 0xfbaf], // ARABIC LETTER YEH BARREE
        0x06d3: [0xfbb0, 0xfbb1] // ARABIC LETTER YEH BARREE WITH HAMZA ABOVE
      };

      /*
        var ligaturesSubstitutionA = {
            0xFBEA: []// ARABIC LIGATURE YEH WITH HAMZA ABOVE WITH ALEF ISOLATED FORM
        };
        */

      var ligatures = {
        0xfedf: {
          0xfe82: 0xfef5, // ARABIC LIGATURE LAM WITH ALEF WITH MADDA ABOVE ISOLATED FORM
          0xfe84: 0xfef7, // ARABIC LIGATURE LAM WITH ALEF WITH HAMZA ABOVE ISOLATED FORM
          0xfe88: 0xfef9, // ARABIC LIGATURE LAM WITH ALEF WITH HAMZA BELOW ISOLATED FORM
          0xfe8e: 0xfefb // ARABIC LIGATURE LAM WITH ALEF ISOLATED FORM
        },
        0xfee0: {
          0xfe82: 0xfef6, // ARABIC LIGATURE LAM WITH ALEF WITH MADDA ABOVE FINAL FORM
          0xfe84: 0xfef8, // ARABIC LIGATURE LAM WITH ALEF WITH HAMZA ABOVE FINAL FORM
          0xfe88: 0xfefa, // ARABIC LIGATURE LAM WITH ALEF WITH HAMZA BELOW FINAL FORM
          0xfe8e: 0xfefc // ARABIC LIGATURE LAM WITH ALEF FINAL FORM
        },
        0xfe8d: { 0xfedf: { 0xfee0: { 0xfeea: 0xfdf2 } } }, // ALLAH
        0x0651: {
          0x064c: 0xfc5e, // Shadda + Dammatan
          0x064d: 0xfc5f, // Shadda + Kasratan
          0x064e: 0xfc60, // Shadda + Fatha
          0x064f: 0xfc61, // Shadda + Damma
          0x0650: 0xfc62 // Shadda + Kasra
        }
      };

      var arabic_diacritics = {
        1612: 64606, // Shadda + Dammatan
        1613: 64607, // Shadda + Kasratan
        1614: 64608, // Shadda + Fatha
        1615: 64609, // Shadda + Damma
        1616: 64610 // Shadda + Kasra
      };

      var alfletter = [1570, 1571, 1573, 1575];

      var noChangeInForm = -1;
      var isolatedForm = 0;
      var finalForm = 1;
      var initialForm = 2;
      var medialForm = 3;

      jsPDFAPI.__arabicParser__ = {};

      //private
      var isInArabicSubstitutionA = (jsPDFAPI.__arabicParser__.isInArabicSubstitutionA = function(
        letter
      ) {
        return typeof arabicSubstitionA[letter.charCodeAt(0)] !== "undefined";
      });

      var isArabicLetter = (jsPDFAPI.__arabicParser__.isArabicLetter = function(
        letter
      ) {
        return (
          typeof letter === "string" &&
          /^[\u0600-\u06FF\u0750-\u077F\u08A0-\u08FF\uFB50-\uFDFF\uFE70-\uFEFF]+$/.test(
            letter
          )
        );
      });

      var isArabicEndLetter = (jsPDFAPI.__arabicParser__.isArabicEndLetter = function(
        letter
      ) {
        return (
          isArabicLetter(letter) &&
          isInArabicSubstitutionA(letter) &&
          arabicSubstitionA[letter.charCodeAt(0)].length <= 2
        );
      });

      var isArabicAlfLetter = (jsPDFAPI.__arabicParser__.isArabicAlfLetter = function(
        letter
      ) {
        return (
          isArabicLetter(letter) && alfletter.indexOf(letter.charCodeAt(0)) >= 0
        );
      });

      jsPDFAPI.__arabicParser__.arabicLetterHasIsolatedForm = function(letter) {
        return (
          isArabicLetter(letter) &&
          isInArabicSubstitutionA(letter) &&
          arabicSubstitionA[letter.charCodeAt(0)].length >= 1
        );
      };

      var arabicLetterHasFinalForm = (jsPDFAPI.__arabicParser__.arabicLetterHasFinalForm = function(
        letter
      ) {
        return (
          isArabicLetter(letter) &&
          isInArabicSubstitutionA(letter) &&
          arabicSubstitionA[letter.charCodeAt(0)].length >= 2
        );
      });

      jsPDFAPI.__arabicParser__.arabicLetterHasInitialForm = function(letter) {
        return (
          isArabicLetter(letter) &&
          isInArabicSubstitutionA(letter) &&
          arabicSubstitionA[letter.charCodeAt(0)].length >= 3
        );
      };

      var arabicLetterHasMedialForm = (jsPDFAPI.__arabicParser__.arabicLetterHasMedialForm = function(
        letter
      ) {
        return (
          isArabicLetter(letter) &&
          isInArabicSubstitutionA(letter) &&
          arabicSubstitionA[letter.charCodeAt(0)].length == 4
        );
      });

      var resolveLigatures = (jsPDFAPI.__arabicParser__.resolveLigatures = function(
        letters
      ) {
        var i = 0;
        var tmpLigatures = ligatures;
        var result = "";
        var effectedLetters = 0;

        for (i = 0; i < letters.length; i += 1) {
          if (typeof tmpLigatures[letters.charCodeAt(i)] !== "undefined") {
            effectedLetters++;
            tmpLigatures = tmpLigatures[letters.charCodeAt(i)];

            if (typeof tmpLigatures === "number") {
              result += String.fromCharCode(tmpLigatures);
              tmpLigatures = ligatures;
              effectedLetters = 0;
            }
            if (i === letters.length - 1) {
              tmpLigatures = ligatures;
              result += letters.charAt(i - (effectedLetters - 1));
              i = i - (effectedLetters - 1);
              effectedLetters = 0;
            }
          } else {
            tmpLigatures = ligatures;
            result += letters.charAt(i - effectedLetters);
            i = i - effectedLetters;
            effectedLetters = 0;
          }
        }

        return result;
      });

      jsPDFAPI.__arabicParser__.isArabicDiacritic = function(letter) {
        return (
          letter !== undefined &&
          arabic_diacritics[letter.charCodeAt(0)] !== undefined
        );
      };

      var getCorrectForm = (jsPDFAPI.__arabicParser__.getCorrectForm = function(
        currentChar,
        beforeChar,
        nextChar
      ) {
        if (!isArabicLetter(currentChar)) {
          return -1;
        }

        if (isInArabicSubstitutionA(currentChar) === false) {
          return noChangeInForm;
        }
        if (
          !arabicLetterHasFinalForm(currentChar) ||
          (!isArabicLetter(beforeChar) && !isArabicLetter(nextChar)) ||
          (!isArabicLetter(nextChar) && isArabicEndLetter(beforeChar)) ||
          (isArabicEndLetter(currentChar) && !isArabicLetter(beforeChar)) ||
          (isArabicEndLetter(currentChar) && isArabicAlfLetter(beforeChar)) ||
          (isArabicEndLetter(currentChar) && isArabicEndLetter(beforeChar))
        ) {
          return isolatedForm;
        }

        if (
          arabicLetterHasMedialForm(currentChar) &&
          isArabicLetter(beforeChar) &&
          !isArabicEndLetter(beforeChar) &&
          isArabicLetter(nextChar) &&
          arabicLetterHasFinalForm(nextChar)
        ) {
          return medialForm;
        }

        if (isArabicEndLetter(currentChar) || !isArabicLetter(nextChar)) {
          return finalForm;
        }
        return initialForm;
      });

      /**
       * @name processArabic
       * @function
       * @param {string} text
       * @returns {string}
       */
      var parseArabic = function(text) {
        text = text || "";

        var result = "";
        var i = 0;
        var j = 0;
        var position = 0;
        var currentLetter = "";
        var prevLetter = "";
        var nextLetter = "";

        var words = text.split("\\s+");
        var newWords = [];
        for (i = 0; i < words.length; i += 1) {
          newWords.push("");
          for (j = 0; j < words[i].length; j += 1) {
            currentLetter = words[i][j];
            prevLetter = words[i][j - 1];
            nextLetter = words[i][j + 1];
            if (isArabicLetter(currentLetter)) {
              position = getCorrectForm(currentLetter, prevLetter, nextLetter);
              if (position !== -1) {
                newWords[i] += String.fromCharCode(
                  arabicSubstitionA[currentLetter.charCodeAt(0)][position]
                );
              } else {
                newWords[i] += currentLetter;
              }
            } else {
              newWords[i] += currentLetter;
            }
          }

          newWords[i] = resolveLigatures(newWords[i]);
        }
        result = newWords.join(" ");

        return result;
      };

      var processArabic = (jsPDFAPI.__arabicParser__.processArabic = jsPDFAPI.processArabic = function() {
        var text =
          typeof arguments[0] === "string" ? arguments[0] : arguments[0].text;
        var tmpText = [];
        var result;

        if (Array.isArray(text)) {
          var i = 0;
          tmpText = [];
          for (i = 0; i < text.length; i += 1) {
            if (Array.isArray(text[i])) {
              tmpText.push([parseArabic(text[i][0]), text[i][1], text[i][2]]);
            } else {
              tmpText.push([parseArabic(text[i])]);
            }
          }
          result = tmpText;
        } else {
          result = parseArabic(text);
        }
        if (typeof arguments[0] === "string") {
          return result;
        } else {
          arguments[0].text = result;
          return arguments[0];
        }
      });

      jsPDFAPI.events.push(["preProcessText", processArabic]);
    })(jsPDF.API);