import {Express, Router} from "express";
import config from "config";
import * as child_process from "child_process";
import ApplicationComponent from "../ApplicationComponent";
import {ForbiddenHttpError} from "../HttpError";
import Logger from "../Logger";

const ROUTE = '/update/push.json';

export default class AutoUpdateComponent extends ApplicationComponent<void> {
    public async start(app: Express, router: Router): Promise<void> {
        router.post(ROUTE, (req, res, next) => {
            const token = req.header('X-Gitlab-Token');
            if (!token || token !== config.get<string>('gitlab_webhook_token')) throw new ForbiddenHttpError('Invalid token', req.url);

            this.update(req.body.checkout_sha)
                .catch(Logger.error);

            res.json({
                'status': 'ok',
            });
        });
    }

    public async stop(): Promise<void> {
    }

    private async update(checkout_sha: string) {
        await this.app!.stop();

        try {
            Logger.info('Starting auto update...');

            // Fetch
            await this.runCommand(`git fetch`);

            // Checkout new source
            await this.runCommand(`git checkout ${checkout_sha}`);

            // Install new dependencies
            await this.runCommand(`yarn install --production=false`);

            // Process assets
            await this.runCommand(`yarn dist`);

            Logger.info('Success!');
        } catch (e) {
            Logger.error(e, 'An error occurred while running the auto update.');
        }
    }

    private async runCommand(command: string) {
        Logger.info(`> ${command}`);
        Logger.info(child_process.execSync(command).toString());
    }
}