// Debug
const { DebugBuilder } = require("../utilities/debugBuilder.js");
const log = new DebugBuilder("client", "clientController");
// Modules
const path = require('path');
const fork = require('child_process').fork;
const discordBotPath = path.resolve('discord-bot/app.js');

let botChildProcess, tempRes;

/**
 * Bot Process Object Builder
 *
 * This construnctor is used to easily pass commands to the bot process
 */
class BPOB {
    /**
     * Build an object to be passed to the bot process
     * @param command The command to be run ("Status", "Join", "Leave", "ChgPreSet")
     * @param parameters Depending on the command being run, there parameters required in order to be run
     */
    constructor(command = "Status"||"Join"||"Leave"||"ChgPreSet", parameters = []||undefined) {
        this.cmd = command;
        if (parameters) this.params = parameters;
    }
}

/**
 * Get Status of the discord process
 */
exports.getStatus = (req, res) => {
    if (!botChildProcess) return res.sendStatus(200);
    botChildProcess.send(new BPOB("Status"));
    tempRes = res;
}

/**
 * Start the bot and join the server and preset specified
 */
exports.joinServer = (req, res) => {
    const channelID = req.body.channelID;
    const presetName = req.body.presetName;

    if (!channelID || !presetName) return res.status(400).json({'message': "Channel ID or Preset Name not present in the request"});
    // Start the bot
    botChildProcess = fork(discordBotPath);

    // Handle bot responses
    botChildProcess.on('message', (msg) => {
        log.DEBUG('Child response: ', msg);
        if (msg.msg === "INIT READY") {
            // Discord bot has started and is ready.
            botChildProcess.send(new BPOB("Join", {"channelID": channelID, "presetName": presetName}))
            tempRes = res;
        }
        switch (msg.cmd){
            case "Status":
                if (msg.msg === "VDISCONN") tempRes.sendStatus(201); // VDISCONN == Voice DISCONNected
                else tempRes.sendStatus(202);
                tempRes = undefined;
                return;
            case "Join":
                tempRes.sendStatus(202);
                tempRes = undefined;
                return;
            case "Leave":
                tempRes.sendStatus(202);
                tempRes = undefined;
                botChildProcess.kill();
                botChildProcess = undefined;
                return;
            case "ChgPreSet":
                tempRes.sendStatus(200);
                tempRes = undefined;
                return;
        }
    })
}

/**
 * Leaves the server if it's in one
 */
exports.leaveServer = (req, res) => {
    if (!botChildProcess) return res.sendStatus(200)
    botChildProcess.send(new BPOB("Leave"));
    tempRes = res;
}