/*************************************************************
 *
 *  Copyright (c) 2018 The MathJax Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */


/**
 * @fileoverview Configuration file for the mhchem package.
 *
 * @author v.sorge@mathjax.org (Volker Sorge)
 */

import {Configuration} from '../Configuration.js';
import {CommandMap} from '../SymbolMap.js';
import {ParseMethod} from '../Types.js';
import TexError from '../TexError.js';
import TexParser from '../TexParser.js';
import BaseMethods from '../base/BaseMethods.js';
import AmsMethods from '../ams/AmsMethods.js';
import {mhchemParser, texify} from './mhchem_parser.js';

// Namespace
let MhchemMethods: Record<string, ParseMethod> = {};

MhchemMethods.Macro = BaseMethods.Macro;
MhchemMethods.xArrow = AmsMethods.xArrow;
MhchemMethods.Machine = function(parser: TexParser, name: string, machine: string) {
  try {
    let arg = parser.GetArgument(name);
    let data = mhchemParser.go(arg, machine);
    // TODO: Harvest chemical information here from data, test looping through
    //       the array.
    let tex = texify.go(data);
    parser.string = tex + parser.string.substr(parser.i);
    parser.i = 0;
  } catch (err) {
    throw new TexError(err[0], err[1], err.slice(2));
  }
};

new CommandMap(
  'mhchem',
  {ce: ['Machine', 'ce'],
   pu: ['Machine', 'pu'],
   longrightleftharpoons: ['Macro',
                           '\\stackrel{\\textstyle{-}\\!\\!{\\rightharpoonup}}{\\smash{{\\leftharpoondown}\\!\\!{-}}}'],
   longRightleftharpoons: ['Macro',
                           '\\stackrel{\\textstyle{-}\\!\\!{\\rightharpoonup}}{\\smash{\\leftharpoondown}}'],
   longLeftrightharpoons: ['Macro',
                           '\\stackrel{\\textstyle\\vphantom{{-}}{\\rightharpoonup}}{\\smash{{\\leftharpoondown}\\!\\!{-}}}'],
   longleftrightarrows: ['Macro',
                         '\\stackrel{\\longrightarrow}{\\smash{\\longleftarrow}\\Rule{0px}{.25em}{0px}}'],
   //
   //  Needed for \bond for the ~ forms
   //  Not perfectly aligned when zoomed in, but on 100%
   //
   tripledash: ['Macro',
                '\\vphantom{-}\\raise2mu{\\kern2mu\\tiny\\text{-}\\kern1mu\\text{-}\\kern1mu\\text{-}\\kern2mu}'],
   xrightarrow: ['xArrow', 0x2192, 5, 6],
   xleftarrow:  ['xArrow', 0x2190, 7, 3],
   xleftrightarrow:    ['xArrow', 0x2194, 6, 6],
   xrightleftharpoons: ['xArrow', 0x21CC, 5, 7],   // FIXME:  doesn't stretch in HTML-CSS output
   xRightleftharpoons: ['xArrow', 0x21CC, 5, 7],   // FIXME:  how should this be handled?
   xLeftrightharpoons: ['xArrow', 0x21CC, 5, 7]
  },
  MhchemMethods);


export const MhchemConfiguration = Configuration.create(
  'mhchem', {handler: {macro: ['mhchem']}}
);