import { plugin, type BunPlugin } from "bun";
import path from 'path';

const fontPlugin: BunPlugin = {
    name: "Font loader",
    async setup(build) {
        build.onLoad({ filter: /\.font\.css$/ }, async (args) => {
            const css = await Bun.file(args.path).text();

            const match = css.match(/url\(['"]?([^'")]*)['"]?\)/);
            if (match?.[1]) {
                const fontName = match[1];
                const fontPath = path.resolve(path.dirname(args.path), fontName);
                const fontFile = Bun.file(fontPath);
                if (await fontFile.exists()) {
                    const buffer = Buffer.from(await fontFile.arrayBuffer());
                    const url = `data:;base64,${buffer.toString('base64')}`;
                    const updatedCSS = css.replace(fontName, url)
                        .replace(/(\n\s*)*/g, '')
                        .replace(/;\s*\}/g, '}')
                        .replace(/\s*([{:])\s*/g, '$1');

                    return {
                        contents: `import { injectStyle } from '__style_helper__';
                                   injectStyle(${JSON.stringify(updatedCSS)})`,
                        loader: 'js',
                    }
                }
            }

            return {
                contents: '',
                loader: 'js',
            };
        });
    }
};

plugin(fontPlugin);

export default fontPlugin;