'use strict'

import { ipcRenderer } from 'electron';
import SerialPort from 'serialport';

const serials = {};
const ids = ipcRenderer.sendSync('windowsid', 'already');


/* ************ Functions ************ */

/**
 * Parse a incoming a list of messages of ports, & divide into two parts, based
 * on connected boards.
 * @param {Array} list A list of messages of ports
 * @returns {Object} A object which contains two arrays
 */
function parsePorts(list) {
    let result = { boards: [], wifi: [] };
    list.forEach(val => {
        let mf = val.manufacturer;
        if (mf) {
            // if (mf.indexOf('Arduino') > -1)
            //     result.boards.push(val);
            if (mf.indexOf('ftdi') > -1)
                result.wifi.push(val);
        }
    });
    return result;
}

/**
 * Handle error, & send error back to the previous process.
 * @param {Error} err Incoming error
 * @param {string} event Event name
 * @param {Array<string|number>} data Data to send
 * @returns {void} void
 */
function errorHandler(err, event, sid = '', data = []) {
    ipcRenderer.sendTo(ids[0], 'error', err, event, sid, data);
    return;
}

/**
 * Handle list event & return a set of messages of connected boards.
 * @returns {void} void
 */
function listHandler() {
    SerialPort.list()
        .then(result => {
            let res = parsePorts(result);
            ipcRenderer.sendTo(ids[0], 'result_list', res);
        })
        .catch(err => errorHandler(err, 'list'));
    return;
}

/**
 * Handle open command, & receive messages from board.
 * @param {string} sid Socket's id
 * @param {string} comName Name of port
 * @param {number} baudRate Number of baud rate
 * @returns {void} void
 */
function openHandler(e, sid, comName, baudRate = 9600) {
    const serial = new SerialPort(comName, { baudRate: baudRate }, err => {
        if (!err) {
            ipcRenderer.sendTo(ids[0], 'result_open', sid, comName, baudRate);
            serial.on('readable', () => {
                let str = serial.read();
                str instanceof Buffer ? str = str.toString('utf-8') : '';
                ipcRenderer.sendTo(ids[0], 'message', sid, str);
            })
            serials[sid] = serial;
        } else
            errorHandler(err, 'open', sid);
    });
    return;
}

/**
 * Handle close command, & close the communication.
 * @param {string} sid Socket's id
 * @returns {void} void
 */
function closeHandler(e, sid) {
    const serial = serials[sid];
    if (serial && serial.isOpen)
        serial.close(err => {
            if (!err) {
                delete serials[sid];
                ipcRenderer.sendTo(ids[0], 'result_close', sid)
            } else
                errorHandler(err, 'close', sid);
            return;
        });
}

/**
 * Handle send command, & send a message to board.
 * @param {string} sid Socket's id
 * @param {string} msg Incoming message
 * @param {string} postfix Postfix of sending message
 * @returns {void} void
 */
function sendHandler(e, sid, msg, postfix = '') {
    const serial = serials[sid];
    if (serial && serial.isOpen) {
        if (postfix === 'nl')
            postfix = '\n';
        else if (postfix === 'cr')
            postfix = '\r';
        else if (postfix === 'blc')
            postfix = '\n\r';
        msg += postfix;
        serial.write(msg, 'utf-8', e => console.warn(e));
    }
    return;
}

/**
 * Handle update command, & update the communication to a specific
 * baud rate.
 * @param {string} sid Socket's id
 * @param {number} baudRate Baud rate to update to
 * @returns {void} void
 */
function updateHandler(e, sid, baudRate) {
    const serial = serials[sid];
    if (serial && serial.isOpen) {
        serial.update({ baudRate: baudRate }, err => {
            err ?
                errorHandler(err, 'update', sid, [baudRate]) :
                ipcRenderer.sendTo(ids[0], 'result_update', sid, baudRate);
        });
    }
    return;
}

/**
 * Parse a incoming a list of messages of ports, & compare with list map, &
 * check if it's get new boards connected.
 * @param {Array<string>} map An array with comNames
 * @returns {void} void
 */
function detectListChange(map) {
    SerialPort.list()
        .then(result => {
            let is_changed = false, comNames = [], res = { boards: [], wifi: [] };
            result.forEach(val => {
                if (val.manufacturer) {
                    if (val.manufacturer.toLocaleLowerCase().indexOf('ftdi') > -1)
                        res.wifi.push(val);
                    // else if (val.manufacturer.toLocaleLowerCase().indexOf('silicon') > -1)
                    //     res.wifi.push(val);
                    comNames.push(val.comName);
                }
            });
            if (comNames.length !== map.length)
                is_changed = true;
            else {
                for (let i = 0; i < comNames.length; i++)
                    if (map.indexOf(comNames[i]) < 0) {
                        is_changed = true;
                        break;
                    }
            }
            if (is_changed) {
                ipcRenderer.sendTo(ids[0], 'result_list', res);
                map.length = 0;
                comNames.forEach(val => {
                    map.push(val);
                });
            }
        })
        .catch(err => errorHandler(err, 'list'));
    return;
}

/**
 * Run detectListChange function every 3 secs.
 * @returns {void} void
 */
function loopDetectListChange() {
    let listMap = [];
    setInterval(() => {
        detectListChange(listMap);
    }, 3000);
}


// ------ bind functions to ipcRenderer's events  ------ //
ipcRenderer.on('handle_list', listHandler);
ipcRenderer.on('handle_open', openHandler);
ipcRenderer.on('handle_close', closeHandler);
ipcRenderer.on('handle_send', sendHandler);
ipcRenderer.on('handle_update', updateHandler);
ipcRenderer.on('disconnect', sid => {
    const serial = serials[sid];
    serial ? delete serials[sid] : '';
    return;
});

loopDetectListChange();