/*************************************************************
 *
 *  Copyright (c) 2023 The MathJax Consortium, krautzource UG
 *
 *  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    Macro to include images
 *
 * @author dpvc@mathjax.org (Davide P. Cervone)
 * @author peter@krautzource.com (Peter Krautzberger)
 */

import { Configuration } from "@mathjax/src/js/input/tex/Configuration.js";
import { CommandMap } from "@mathjax/src/js/input/tex/TokenMap.js";
import TexError from "@mathjax/src/js/input/tex/TexError.js";
import TexParser from "@mathjax/src/js/input/tex/TexParser.js";
import { ParseMethod } from "@mathjax/src/js/input/tex/Types.js";

let imgMethods: Record<string, ParseMethod> = {};

const CheckDimen = function (dimen: string) {
  if (dimen === "") return "";
  if (
    dimen.match(
      /^\s*([-+]?(\.\d+|\d+(\.\d*)?))\s*(pt|em|ex|mu|px|mm|cm|in|pc)\s*$/
    )
  ) {
    return dimen.replace(/ /g, "");
  }
  throw new TexError("BadImageDimen", "Bad dimension for image: %1", dimen);
};

interface def extends Record<string, any> {
  src: string;
  alt?: string;
  valign?: string;
  width?: string;
  height?: string;
}

imgMethods.Img = function (parser: TexParser, name: string) {
  const arg = parser.GetBrackets(name, "");
  const def: def = {
    src: "",
    alt: "",
    valign: "",
    width: "",
    height: "",
  };
  if (arg.match(/[,=]/)) {
    for (const pair of arg.split(/\s*,\s*/)) {
      const [key, ...value] = pair.split(/\s*=\s*/);
      if (!def.hasOwnProperty(key))
        throw new TexError(
          "UnknownKey",
          'Unknown parameter "%1" in %2',
          key,
          name
        );
      def[key] = CheckDimen(value.join("="));
    }
  } else {
    def.valign = CheckDimen(arg);
    def.width = CheckDimen(parser.GetBrackets(name, ""));
    def.height = CheckDimen(parser.GetBrackets(name, ""));
  }
  def.alt = parser.GetBrackets(name, "");
  def.src = parser.GetArgument(name);
  if (!def.valign) delete def.valign;
  if (!def.width) delete def.width;
  if (!def.height) delete def.height;
  if (!def.alt) delete def.alt;
  parser.Push(parser.create("token", "mglyph", def));
};

new CommandMap("img", { img: "Img" }, imgMethods);

export const configuration = Configuration.create("img", {
  handler: { macro: ["img"] },
});