import express, {Application, RequestHandler} from "express";
import { Server as HttpServer } from "http";
import { Logger } from "../logger/logger";

export class Server {
    private readonly app: Application;
    private server?: HttpServer;
    private readonly logger: Logger;

    constructor(logger: Logger) {
        this.logger = logger;

        this.app = express();

        this.app.use(express.json());
        this.app.use(express.urlencoded({ extended: true }));
        this.app.use((req, res, next) => {
            const start = Date.now();
            this.logger.info(`[${new Date().toISOString()}] ${req.method} ${req.originalUrl}`);

            res.on('finish', () => {
                const duration = Date.now() - start;
                this.logger.info(`${req.method} ${req.originalUrl} ${res.statusCode} - ${duration}ms`);
            });

            next();
        })
    }

    public start(port: number): Promise<void> {
        return new Promise((resolve, reject) => {
            if (this.server) {
                return reject(new Error("Server is already running"));
            }

            this.server = this.app.listen(port, () => {
                this.logger.info(`[Server]: Listening on port ${port}`);
                resolve();
            });

            this.server.on("error", reject);
        });
    }

    public stop(): Promise<void> {
        return new Promise((resolve, reject) => {
            if (!this.server) {
                return resolve();
            }

            this.server.close((err) => {
                if (err) {
                    return reject(err);
                }

                this.server = undefined;
                resolve();
            });
        });
    }

    public get(path: string, handler: RequestHandler): void {
        this.app.get(path, handler);
    }

    public post(path: string, handler: RequestHandler): void {
        this.app.post(path, handler);
    }
}