/*
 * Copyright (C) 2022 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
import {Font, open} from 'fontkit';
import {existsSync} from 'fs';
import {getUsedIcons} from './gather-used-icons.js';
import {fetchCodePointMap} from './get-code-points.js';
import type {IconConfig} from '../index.js';

export async function checkIconCorrectness(config: IconConfig) {
  if (!existsSync(config.outputPath)) {
    throw new Error('Icons have not been generated');
  }

  const modifiedFont = (await open(config.outputPath)) as Font;
  const codePoints = await fetchCodePointMap();

  for (const icon of await getUsedIcons(config)) {
    const codePoint = codePoints.get(icon);
    if (!codePoint) throw new Error(`"${icon}" is not a valid icon`);
    if (!modifiedFont.getGlyph(Number.parseInt(codePoint, 16))) {
      throw new Error(`"${icon}" (code point ${codePoint}) is missing`);
    }
  }
}