import * as http from "http";
import * as fs from "fs";
import * as path from "path";
import { ISensors } from "./io";


export default class HttpServer {

    private httpServer: http.Server;
    private port: number;
    private root: string;
    // public constructor(port: number, root: string, tune: (ch: string, adp?: number) => void, getChannels: ()=>string[], getSignal: (adapter:number)=>object) {

    public constructor(port: number, root: string, getSensors: ()=>ISensors, setPower: (power: boolean) => void) {
        this.port = port;
        this.root = root;
        this.httpServer = http.createServer((req, res) => {
            let status: number = 404;
            let body: any = "";
            const url = new URL(req.url, `http://${req.headers.host}`);
            const pathname = path.normalize(url.pathname);

            if (pathname.startsWith('/api/')) {
                const query = pathname.split('/');
                const api = query[2];
                switch (req.method) {
                    case "GET":
                        switch (api) {
                            case "sensors":
                                body = JSON.stringify(getSensors());
                                status = 200;
                                break;
                            case "signal":
                                const adapter = parseInt(url.searchParams.get('adapter'));
                                // body = JSON.stringify(getSignal(adapter));
                                status = 200;
                                break;

                        }
                        break;
                    case "PUT":
                        switch (api) {
                            case "power":
                                const channel = decodeURIComponent(query[3]);
                                const adapter = parseInt(url.searchParams.get('adapter'));
                                // tune(channel, adapter);
                                status = 202;
                                break;
     
                        }

                }
            }
            else if (req.method === 'GET') {
                const filePath = path.join(root, path.extname(pathname) === '' ? pathname + "/index.html" : pathname);
                try {
                    body = fs.readFileSync(filePath);
                    status = 200;
                }
                catch (err) {
                    body = "Invalid File"
                }
            }
            else {
                body = "Invalid Request"
            }
            res.writeHead(status);
            res.end(body);

        });
    }
    public start() {
        this.httpServer.listen(this.port, () => {
            console.log(`Serving ${this.root} at http://localhost:${this.port}`);
        });
    }







}