/* Callbacks default responses. */

let GLOBAL = {};

GLOBAL.DEFAULT_OK_RESPONSE = {
    result: "Ok",
    message: "Operation Succeeded"
};

GLOBAL.DEFAULT_FAIL_RESPONSE = {
    result: "Fail",
    message: "Operation Failed"
};

GLOBAL.DEFAULT_RETRY_RESPONSE = {
    result: "Retry",
    message: "Retry Later"
};

GLOBAL.CUSTOM_OK_RESPONSE = {
    result: "Ok, but check Message",
    message: "Custom Message"
};

GLOBAL.CUSTOM_FAIL_RESPONSE = {
    result: "Fail Because",
    message: "Custom Message"
};

let browserCanvas;                 // This is the canvas object of the browser.

function spacePad(str, max) {
    str = str.toString();
    return str.length < max ? spacePad(" " + str, max) : str;
}

function loadSuperalgos() {

    const MODULE_NAME = "App Pre-Loader";
    const INFO_LOG = false;
    const ERROR_LOG = true;

    if (INFO_LOG === true) { console.log(spacePad(MODULE_NAME, 50) + " : " + "[INFO] loadSuperalgos -> Entering function."); }

    /* The first thing to do here is to add the canvas where all the action is going to happen. */


    let textArea = document.createElement('textarea');
    textArea.id = "textArea";
    textArea.spellcheck = false;
    textArea.style = 'resize: none;' +
        ' border: none;' +
        ' outline: none;' +
        'box-shadow: none;' +
        'overflow:hidden;' +
        'font-family: ' + 'Saira' + ';' +
        'font-size: 12px;' +
        'background-color: rgb(255, 255, 255);' +
        'color:rgb(255, 255, 255);' +
        'width: ' + 800 + 'px;' +
        'height: ' + 600 + 'px'

    let textAreaDiv = document.getElementById('textAreaDiv');
    textAreaDiv.appendChild(textArea);
    textAreaDiv.style = 'position:fixed; top:' + -1500 + 'px; left:' + 500 + 'px; z-index:10; '

    let input = document.createElement('input');
    input.id = "input";
    input.spellcheck = false;
    input.style = "border: none; outline: none; box-shadow: none; overflow:hidden;  width: 0px; height: 0px;";

    let inputDiv = document.getElementById('inputDiv');
    inputDiv.appendChild(input);


    let canvas = document.createElement('canvas');

    canvas.id = "canvas";
    canvas.width = 1400;
    canvas.height = 600;
    canvas.style.border = "0";
    canvas.style = "position:absolute; top:0px; left:0px; z-index:1";

    let canvasApp = document.getElementById('canvasApp');
    canvasApp.appendChild(canvas);

    browserCanvas = document.getElementById('canvas');

    browserCanvas.width = window.innerWidth;
    browserCanvas.height = window.innerHeight - window.canvasApp.topMargin;
    browserCanvas.style.border = "none";

    browserCanvas.style.top = window.canvasApp.topMargin + 'px';



    loadDebugModule();

    function loadDebugModule() {

        try {
            if (INFO_LOG === true) { console.log(spacePad(MODULE_NAME, 50) + " : " + "[INFO] loadDebugModule -> Entering function."); }

            let path = window.canvasApp.urlPrefix + "WebDebugLog.js";

            REQUIREJS([path], onRequired);

            function onRequired(pModule) {

                if (INFO_LOG === true) { console.log(spacePad(MODULE_NAME, 50) + " : " + "[INFO] " + path + " downloaded."); }

                loadModules();

            }
        }
        catch (err) {
            console.log(spacePad(MODULE_NAME, 50) + " : " + "[ERROR]  loadDebugModule --> " + path + " --> err = " + err.stack);
        }
    }

    /* And Finally, we start loading all the scripts we will inmediatelly need. */

    function loadModules() {

        try {

            if (INFO_LOG === true) { console.log(spacePad(MODULE_NAME, 50) + " : " + "[INFO] loadModules -> Entering function."); }

            let path = window.canvasApp.urlPrefix + "Scripts/AppLoader.js";

            REQUIREJS([path], onRequired);

            function onRequired(pModule) {

                if (INFO_LOG === true) { console.log(spacePad(MODULE_NAME, 50) + " : " + "[INFO] " + path + " downloaded."); }

                let APP_LOADER_MODULE = newAppLoader();
                APP_LOADER_MODULE.loadModules();

            }
        }
        catch (err) {
            console.log(spacePad(MODULE_NAME, 50) + " : " + "[ERROR]  loadModules --> " + path + " --> err = " + err.stack);
        }
    }
}

function callServer(pContentToSend, pPath, callBackFunction) {
    let xhttp = new XMLHttpRequest();
    xhttp.onreadystatechange = function () {
        if (this.readyState === 4 && this.status === 200) {
            callBackFunction(GLOBAL.DEFAULT_OK_RESPONSE, xhttp.responseText);
            return;
        } else if (this.readyState === 4 && this.status === 404) {
            callBackFunction({ result: "Fail", message: xhttp.responseText.trim(), code: xhttp.responseText.trim() });
            return;
        }
    };

    if (pContentToSend === undefined) {
        xhttp.open("GET", pPath, true);
        xhttp.send();
    } else {
        try {
            let blob = new Blob([pContentToSend], { type: 'text/plain' });
            xhttp.open("POST", pPath, true);
            xhttp.send(blob);
        } catch (err) {
            if (ERROR_LOG === true) { console.log(spacePad(MODULE_NAME, 50) + " : " + "[ERROR] callServer -> err.message = " & err.message); }
            callBackFunction({ result: "Fail", message: err.message })
        }
    }
}