import { join } from 'path';

import glob from 'glob';

interface Options {
    cwd?: string;
    filename?: string;
}
/**
 *
 * @api public
 */
export class PagesPlugin {
    opts: any;
    constructor(opts: Options) {
        opts = opts || {};
        this.opts = {};
        this.opts.cwd = opts.cwd || join(process.cwd(), 'src', 'pages');
        this.opts.filename = opts.filename || 'pages.json';
    }

    apply(compiler: any) {
        compiler.hooks.emit.tapPromise('pages-plugin', this.emitStats.bind(this));
    }

    emitStats(curCompiler: any, callback: any) {
        return Promise.resolve().then(() => {
            const json = JSON.stringify(glob.sync('**/*.tsx', { cwd: join(this.opts.cwd) }));
            curCompiler.assets[this.opts.filename] = {
                source() {
                    return json;
                },
                size() {
                    return json.length;
                },
            };

            if (callback) {
                return void callback();
            }
        });
    }
}