import * as config from './config';
import * as storage from './storage';
import * as http_server from './http';
import * as des from './deserializer';
import * as send from './send';
import * as recv from './recv';

import { MESSAGE, EVENT, SESSION } from './enums';
import { sessions, desks } from './storage';

export function startup() {
    Bun.serve({
        hostname: config.HOST,
        port: config.PORT,
        
        fetch(req, server) {
            const url = new URL(req.url);

            if (url.pathname == '/ws/') {
                const desk_id = url.searchParams.get('deskId') || '0';
                const session_id = url.searchParams.get('sessionId') || '0';

                if (!(desk_id in desks)) {
                    const desk = {
                        id: desk_id,
                        sn: 0,
                        events: [],
                    };

                    storage.queries.insert_desk.run({
                        '$id': desk_id, 
                        '$title': `Desk ${desk_id}`
                    });

                    desks[desk_id] = desk;
                }

                server.upgrade(req, { 
                    data: { 
                        desk_id: desk_id,
                        session_id: session_id,
                    }
                });

                return;
            }

            return http_server.route(req);
        },

        websocket: {
            open(ws) {
                send.send_init(ws);
            },

            async message(ws, u8array) {
                const dataview = new DataView(u8array.buffer);
                const d = des.create(dataview);
                await recv.handle_message(ws, d);
            },

            close(ws, code, message) {
                if (ws.data.session_id in sessions) {
                    const leave_event = {'type': EVENT.LEAVE, 'user_id': ws.data.session_id};
                    send.fire_event(sessions[ws.data.session_id], leave_event); 
                    console.log(`session ${ws.data.session_id} closed`);
                    sessions[ws.data.session_id].state = SESSION.CLOSED;
                    sessions[ws.data.session_id].ws = null;
                }
            },

            error(ws, error) {
                close(ws, 1000, error); // Treat error as normal close
            }
        }
    });

    console.log(`Running on ${config.HOST}:${config.PORT}`)   
}