import {promises as fsp} from 'fs';
import {join} from 'path';
import Zip from 'jszip';
import nunjucks from 'nunjucks';
import {generateLove, LoveVariant} from './love';

export async function entry(): Promise<void> {
  const themeDirectory: string = join(__dirname, '../kitty/');
  // Configure Nunjucks to use the templates for `source/kitty/`.
  nunjucks.configure(themeDirectory, {
    lstripBlocks: true,
    trimBlocks: true,
    throwOnUndefined: true
  });

  // Create a new zip archive.
  const kittyPackage: Zip = new Zip();

  // Generate the Love variants.
  const love: LoveVariant[] = generateLove();

  for (const variant of love) {
    const themeName = `love-${variant.name}.conf`;
    const outputPath: string = join(themeDirectory, themeName);

    // Render the template.
    const theme: string = nunjucks.render('love-template.conf', {
      love: variant
    });

    // Write the theme to file and add it to the zip archive.
    await fsp.writeFile(outputPath, theme);
    kittyPackage.file(themeName, theme);
  }

  // Write the zip archive to file.
  const zip: Buffer = await kittyPackage.generateAsync({type: 'nodebuffer'});
  await fsp.writeFile(join(themeDirectory, 'love-kitty.zip'), zip);
}

if (require.main === module) {
  entry();
}