/* Copyright 2015 Mozilla Foundation
 *
 * 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.
 */

import { SVG_NS } from "./display_utils.js";
import { unreachable } from "../shared/util.js";

class BaseSVGFactory {
  constructor() {
    if (
      (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) &&
      this.constructor === BaseSVGFactory
    ) {
      unreachable("Cannot initialize BaseSVGFactory.");
    }
  }

  create(width, height, skipDimensions = false) {
    if (width <= 0 || height <= 0) {
      throw new Error("Invalid SVG dimensions");
    }
    const svg = this._createSVG("svg:svg");
    svg.setAttribute("version", "1.1");

    if (!skipDimensions) {
      svg.setAttribute("width", `${width}px`);
      svg.setAttribute("height", `${height}px`);
    }

    svg.setAttribute("preserveAspectRatio", "none");
    svg.setAttribute("viewBox", `0 0 ${width} ${height}`);

    return svg;
  }

  createElement(type) {
    if (typeof type !== "string") {
      throw new Error("Invalid SVG element type");
    }
    return this._createSVG(type);
  }

  /**
   * @ignore
   */
  _createSVG(type) {
    unreachable("Abstract method `_createSVG` called.");
  }
}

class DOMSVGFactory extends BaseSVGFactory {
  /**
   * @ignore
   */
  _createSVG(type) {
    return document.createElementNS(SVG_NS, type);
  }
}

export { BaseSVGFactory, DOMSVGFactory };