const express = require("express"),
fs = require("fs"),
chalk = require("chalk"),
emoji = require("./misc/emoji_list.json");
// This is a class that contains the name and status of required modules
class reqMod {
    constructor(name, status) {
        this.name = name;
        this.status = status;
    }
}
// Array containing a list of required modules and their flags
const requiredModules = [
    new reqMod("handle_console", false)
];
let config;
// Statup so sync stuff is fine
// Check if config exists
if (fs.existsSync("./config/config.json")) {
    // It exists, load it.
    config = JSON.parse(fs.readFileSync("./config/config.json"));
} else {
    console.log("[Config] Config file doesn't exist! You probably haven't copied the example config in the config directory.");
    console.log("[Config] Exiting...");
    // It doesn't exist, exit the framework and tell the user what to do
    process.exit(1);
}
global.actualDir = __dirname;
global.internals = {
    version:"Open Source",
};
global.app = express();
global.modules = [];
let dE = new Date(),
// Get the time at invocation
startTime = dE.getTime(),
endTime,
reqhandler;

// Clear console before printing anything
console.clear();

// Read the server header for output
fs.readFile('./misc/ascii.txt', function(err, data) {
    // Make sure there are no errors
    if (err) throw err;
    // Generate and Print the banner
    console.log(highlightHeader(data));
    // Get the modules from the ./modules folder
    fs.readdir("./modules", (err, files) => {
        // Make sure there are no errors
        if (err) throw err;
        for (var i = 0; i < files.length; i++) {
            /*
                For every file in the array, output that it was found 
                in the console and attempt to load it using require.
                Oh, and check that it has .js in it's file name!
            */
            try {
                // Make sure the file has the extention of .js
                if (files[i].includes(".js")) {
                    console.log(`[Modules] Found module ${files[i].toString()}`);
                    global.modules[files[i].toString().replace(".js", "")] = require(`./modules/${files[i].toString()}`);
                    
                    // We want to find out what the request handler module is
                    if (global.modules[files[i].toString().replace(".js", "")].MOD_FUNC == "handle_requests") {
                        // Set reqhandler to the request handler for easy getting
                        reqhandler = global.modules[files[i].toString().replace(".js", "")];
                    }

                    // Loop through and set the required modules flags
                    for (var i1 = 0; i1 < requiredModules.length; i1++) {
                        // Check if this module is a required module
                        if (global.modules[files[i].toString().replace(".js", "")].MOD_FUNC == requiredModules[i1].name) {
                            // It is a required module, set the status flag of this one to true
                            requiredModules[i1].status = true;
                        }
                    }
                } else {
                    // File is not a .js file (module)
                    // Make sure the file is not a directory
                    if (files[i].split(".").length < 2) continue;
                    // Inform user that a file that was found in the modules folder is not a module
                    console.log(`[Modules] Found file ${files[i]}. It is not a module.`)
                }
            } catch (err) {
                console.log(chalk.bgRed(` ! [Modules] There was an issue loading ${files[i]} ! `));
                console.log(chalk.bgRed(` ! [Modules] ${err} ! `));
            }
        }
        // Check if all the required modules flags are set
        let allRequiredExist = [];
        for (var i = 0; i < requiredModules.length; i++) {
            // Push the status of the required modules to an array
            allRequiredExist.push(requiredModules[i].status);
        }
        // Make sure all required modules are found
        if (allRequiredExist.length !== requiredModules.length) {
            // Inform the user that not all required modules are found.
            console.log("[Modules] All required modules could not be found.");
            console.log("[Modules] Server will not start until all required modules are found.");
            // They are not all found, exit framework with code 1.
            process.exit(1);
        } else {
            // All required modules are found, start the framework's server.
            global.modules.consoleHelper.printInfo(emoji.wave, "Starting Revolution...");
            if (reqhandler == null) {
                global.modules.consoleHelper.printError(emoji.cross, "No request handler was loaded, possibly due to an error.");
                process.exit(1);
            }
            frameworkServer();
        }
    });
});

function frameworkServer() {
    // Load in the request handler's extra required items.
    await reqhandler.extras();
    // Define where GET requests go to in the request handlers.
    app.get('*', async (req, res) => {
        res.set("X-Powered-By", "Revolution");
        reqhandler.get(req, res);
    });
    // Define where POST requests go to in the request handlers.
    app.post('*', async (req, res) => {
        res.set("X-Powered-By", "Revolution");
        reqhandler.post(req, res);
    });
    // Start the server listening at the port defined in the config file
    app.listen(config.server.port, () => {
        dE = new Date(),
        // Get time after server has started listening or the "end time".
        endTime = dE.getTime();
        global.modules.consoleHelper.printInfo(emoji.thumb_up, `Started Revolution on port ${config.server.port}! Took ${endTime - startTime}ms`);
    });
}

function highlightHeader(s) {
    // Add the appropriate colours to the header and add information to it
    const s1 = s.toString().replace("|replaceVersion|", `${chalk.yellow("Version:")} ${chalk.cyan(internals.version)}`)
    .replace("|titlecard|", chalk.yellow("A modular and fexible server"))
    .replace("|replaceType|", `${chalk.yellow("Instance: ")}${chalk.cyan(config.server.instance_type)}`);
    return s1;
}