const database = require('../database/database')
const {get_webrtc_port, get_app_port, get_sfu_port} = require('../modules/port_alloc')
const {get_app_path} = require('../modules/titles')
const not_found_error = require('../../lib/src/http/errors/not_found_error')
const server_error = require('../../lib/src/http/errors/server_error')
const {run_webrtc, run_app, run_sfu, kill_proc} = require('../modules/run_process')
const {create_websocket_url} = require('../modules/links')
const {port} = require('../../config')


const run_session = async (req, res, next) => {
    const {title, session_id} = req.body

    let app_path = get_app_path(title)
    if (!app_path) {
        next(new not_found_error('title or path does not exist'))
        return
    }

    let webrtc_port = await get_webrtc_port()
    let app_port = await get_app_port()
    let sfu_port = 8889//await get_sfu_port()

    if (!app_port) {
        next(new server_error('all app ports busy'))
        return
    } else if (!webrtc_port) {
        next(new server_error('all webrtc ports busy'))
        return
    } 
    // else if (!sfu_port) {
    //     next(new server_error('all sfu ports busy'))
    //     return
    // }

    let app_pid = await run_app(app_path, app_port)
    if (!app_pid) {
        next(new server_error('can not run app'))
        return
    }

    const this_server_url = `http://127.0.0.1:${port}`

    let webrtc_pid = await run_webrtc(webrtc_port, app_port, sfu_port, this_server_url, session_id)
    if (!webrtc_pid) {
        kill_proc(app_pid)
        next(new server_error('can not run webrtc'))
        return
    }

    let sfu_pid = null //await run_sfu(sfu_port)
    // if (!sfu_pid) {
    //     kill_proc(app_pid)
    //     kill_proc(webrtc_pid)
    //     next(new server_error('can not run sfu'))
    //     return
    // }


    let add_runnning_session_result = await database.add_running_session(session_id, title, app_pid, webrtc_pid, sfu_pid, app_port, webrtc_port, sfu_port)

    if(!add_runnning_session_result) {
        next(new server_error('can not add session to database'))
        return
    }
    res.json({websocket_url:create_websocket_url(webrtc_port)})
}

module.exports = {
    run_session
}