app.js

// Node.JS Packages
var express = require("express");
var bodyParser = require("body-parser");
var fs = require("fs");
var colors = require("colors");
var cookieParser = require('cookie-parser');
var Cookies = require("cookies");

colors.setTheme({
    title: ['white', 'italic'],
    error: ['bgRed', 'white', 'title'],
    info: ['bgYellow', 'white', 'italic'],
    success: ['bgGreen', 'white'],
});


// Imports for External Refresh Node.JS Functions
var list = require('./modules/list.js');
var examBoard = require('./modules/exam.js');
var scrape = require('./modules/scrape.js');
var convert = require('./modules/convert.js');
var research = require('./modules/research.js');
var question = require('./modules/question.js');
var answer = require('./modules/answer.js');
var database = require('./modules/database.js');
//console.log("App.JS: ".title + " Successfully Imported External Functions".success);

// Instantiating External Refresh Packages
var listModule = new list();
var examBoardModule = new examBoard();
var scrapeModule = new scrape();
var convertModule = new convert();
var researchModule = new research();
var questionModule = new question();
var answerModule = new answer();
var databaseModule = new database();
//console.log("App.JS: ".bold + " Successfully Instantiated Packages".blue);

var databaseModule = new database();

// Creating Express.JS Web Server
var app = express();
//console.log("App.JS: ".title + "Initialised Web Server".success);

// Initialising Middleware
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
    extended: true
}));
//console.log("App.JS: ".title + " Successfully Initialised Middleware".success);

// Creating Static Public Folder
app.use(express.static('public'));
//console.log("App.JS: ".title + " Successfully Created Public Folder".success);

// Pages Cache
var homeTemplate = "";
var dashboardTemplate = "";
var learnTemplate = "";

function refreshTemplateCache(callback) {
    count = 0;

    // Homepage Template
    fs.readFile("pages/index.html", "utf-8", function(err, data) {
        homeTemplate = data;
        count++;
        if ((count == 3) && (callback !== undefined)) {
            callback();
        }
    });

    // Dashboard Template
    fs.readFile("pages/dashboard.html", "utf-8", function(err, data) {
        dashboardTemplate = data;
        count++;
        if ((count == 3) && (callback !== undefined)) {
            callback();
        }
    });

    // Learning Environment Template
    fs.readFile("pages/learn.html", "utf-8", function(err, data) {
        learnTemplate = data;
        count++;
        if ((count == 3) && (callback !== undefined)) {
            callback();
        }
    });
}

// Template Engine
function refreshRenderer(template, elementsToReplace, callback) {
    // Variables //
    var bracket = false;
    var handlebar = false;
    var endBracket = false;
    var tagID = "";
    var start = 0;
    var end = 0;
    var toReplace = [];

    // Collect Points to Template //
    for (i in template) {
        if (handlebar == true) {
            if (template[i] == "}") {
                if (endBracket == true) {
                    handlebar = false;
                    end = i;
                    toReplace.push([tagID.trim(), start, end]);
                    tagID = "";
                }
                endBracket = true;
            } else {
                tagID += template[i];
            }
        } else {
            endBracket = false;
        }

        if (template[i] == "{") {
            if (bracket == true) {
                handlebar = true;
            } else {
                start = i;
            }
            bracket = true;
        } else {
            bracket = false;
        }
    }

    var renderedWebpage = "";
    var previousStartPoint = 0;

    for (e in toReplace) {
        renderedWebpage += template.substring(previousStartPoint, parseInt(toReplace[e][1]));
        renderedWebpage += elementsToReplace[toReplace[e][0]];
        previousStartPoint = parseInt(toReplace[e][2]) + 1;
    }

    renderedWebpage += template.substring(previousStartPoint, template.length);

    callback(renderedWebpage);
}

// App Routes
app.get("/", function(req, res) {
    fs.readFile("pages/index.html", "ASCII", function(err, data) {
        res.send(data);
    });
});

app.post("/register", function(req, res) {
    var firstName = req.body.fName;
    var lastName = req.body.lName;
    var email = req.body.eMail;
    var password = req.body.pass;
    var username = req.body.uName;

    databaseModule.addUser(firstName, lastName, email, password, username, function(output) {
        if (output == true) {
            fs.readFile("pages/syllabus-choice.html", "ASCII", function(err, data) {
                res.send(data);
            });
        } else {
            fs.readFile("pages/syllabus-choice.html", "ASCII", function(err, data) {
                res.send(data);
            });
        }

    });
});

app.get("/learn", function(req, res) {
    fs.readFile("pages/syllabus-choice.html", "ASCII", function(err, data) {
        res.send(data);
    });
});

app.get("/dashboard", function(req, res) {
    console.log("GET /dashboard");
    fs.readFile("pages/dashboard.html", "ASCII", function(err, data) {
        res.send(data);
    });
});

app.get("/login", function(req, res) {
    fs.readFile("pages/login.html", "ASCII", function(err, data) {
        res.send(data);
    });
});

app.get("/logout", function(req, res) {
    res.clearCookie('emai');
    res.clearCookie('loggedin');
    res.redirect(301, "/");
});

app.post("/checkLogin", function(req, res) {
    var cookies = new Cookies(req, res),
        unsigned, signed, tampered;
    var password = req.body.password;
    var email = req.body.email;

    databaseModule.login(email, password, function(output) {
        if (output != false) {
            console.log(output.Email, output.FirstName, output.LastName);
            cookies.set("emai", output.Email, {
                httpOnly: false
            });
            res.cookie('emai', output.Email, {
                maxAge: 900000,
                httpOnly: true
            });
            cookies.set("forename", output.FirstName, {
                httpOnly: false
            });
            cookies.set("surname", output.LastName, {
                httpOnly: false
            });
            cookies.set("loggedin", true, {
                httpOnly: false
            });
            res.redirect(301, '/dashboard?s=loggedin&email=' + email);
        } else {
            res.redirect(301, '/dashboard?s=incorrect_username_password');
        }
    });
});

app.post("/CIE", function(req, res) {
    console.log("App.JS".title + ": " + "Looking for subjects".success);
    listModule.examBoardCIE(function(data) {
        res.send({
            subjectData: data
        });
    });
});

app.post("/CIEsubject", function(req, res) {
    console.log("App.JS".title + ": " + "Looking for syllabii".success);
    var syllabusNumber = String(req.body.syllabusNumber);
    examBoardModule.collectURLs(syllabusNumber, function(data) {
        res.send(data);
    });
});

app.post("/getQuestions", function(req, res) {
    console.log("App.JS".title + ": " + "Looking for questions".success);
    try {
        var email = req.body.email;
        var password = req.body.password;
        var examBoard = req.body.examBoard;
        var subject = req.body.subject;
        var syllabus = req.body.syllabus;
        var url = req.body.url;
        databaseModule.login(email, password, function(output) {
            if (output != false) {
                databaseModule.createSyllabusEntry(email, examBoard, subject, syllabus, function() {
                    scrapeModule.convertPDF(examBoard, subject, syllabus, url, function() {
                        console.log("App.JS".title + ": " + "Converted PDF".success);
                        scrapeModule.scrape(examBoard, subject, syllabus, function(points) {
                        console.log("App.JS".title + ": " + "Scraped".success);
                            convertModule.convert(points, function(searchFields) {
                        console.log("App.JS".title + ": " + "Converted".success);
                                researchModule.researchTopic(searchFields, function(usefulSentences) {
                        console.log("App.JS".title + ": " + "Researched".success);
                                    questionModule.question(usefulSentences, function(toStore) {
                                        //console.log(toStore);
                                        
                                        toStore = JSON.parse(toStore);
                                        if (!toStore) {
                                            res.send(toStore)
                                        } else {
                                            // we have some duplicate keywords in the data so we need to remove them
                                            var newToStore = [[]];
                                            var keywords = [];

                                            for (var i = 0; i < toStore[0].length - 1; i++) {
                                                //console.log(toStore[0][i]);
                                                if (keywords.indexOf(toStore[0][i][0]) == -1) {
                                                    keywords.push(toStore[0][i][0]);
                                                    newToStore[0].push(toStore[0][i]);
                                                }
                                                else {
                                                }
                                            }
                                            newToStore.push(toStore[1]);
                                            fs.writeFile("files/" + subject + ".sentenceData", newToStore, function(err) {
                                                //if (err) throw err;
                                                res.send(newToStore);
                                                console.log(newToStore);
                                                console.log("App.JS".title + ": " + "Sent data to client".success);
                                            });
                                        }
                                    });
                                })
                            });
                        });
                    });
                });
            } else {

            }
        });
    } catch (err) {
        console.log(String(err).red);
    }
});

app.post("/getLearnData", function(req, res) {
    var subject = req.body.examSubject;
    subject = "0620";
    fs.readFile("files/" + subject + ".sentenceData", function(err, data) {
        if (err) {
            res.send("Error :(");
        } else {
            var buffer = JSON.parse(data);
            console.log(buffer);
            res.send(buffer);
        }
    });
});

// Initialising the Express.JS Web Server to Listen on Port process.argv[2]
if (process.argv[2] == undefined) {
    process.argv[2] = 80;
}

var server = app.listen(process.argv[2], function() {
    var host = server.address().address;
    var port = server.address().port;

    refreshTemplateCache();
    console.log("App.JS".title + ": " + "Refresh Running at".success + " " + String(host).blue + ":" + String(port).blue);
});