//Get required packages
const electron = require('electron');
const path = require('path');
const url = require('url');
const fs = require('fs');
const asn1js = require('asn1js');
const util = require('util');
const notifier = require('node-notifier');
const smartcard = require('smartcard');
const axios = require('axios')

let class_code =  "";

let counter = 0;  

const {
  app,
  BrowserWindow,
  Menu,
  ipcMain
} = electron;

let mainWindow;
let AddWindow;

//Listen for the app to be ready
app.on('ready', function () {
  //Create new window
  mainWindow = new BrowserWindow({
    width: 500,
    height: 600,
	webPreferences: {
            nodeIntegration: true
  }});
  

  //Load html into window
  mainWindow.loadURL(url.format({
    pathname: path.join(__dirname, "classcode.html"),
    protocol: "file:",
    slashes: true
  }));

  //Quit app when closed
  mainWindow.on("closed", function () {
    app.quit();
  })

  //Menu from template
  const mainMenu = Menu.buildFromTemplate(mainMenuTemplate);
  Menu.setApplicationMenu(mainMenu);
});

function readNewCard(application) {
  application.issueCommand([0x00, 0xA4, 0x04, 0x04, 0x07, 0xD6, 0x16, 0x00, 0x00, 0x30, 0x01, 0x01, 0x00])
  .then(response => {
            console.info(`Response: '${response}' '${response.meaning()}'`);
    application.issueCommand([0x00, 0xA4, 0x02, 0x04, 0x02, 0x00, 0x02, 0x00])
      .then(response => {
              console.info(`Response: '${response}' '${response.meaning()}'`);
                var response2 = `${response}`;

              if(response2.indexOf("6a82") == 0) {
                console.log("ALERTTTTTT");
                readNewCard(application);
                return;
              }
        application.issueCommand([0x00, 0xB0, 0x00, 0x00, 0xE6])
          .then(response => {
              console.info(`Response: '${response}' '${response.meaning()}'`);

            var response2 = `${response}`;

            if(response2.indexOf("000000") == 0) {
              console.log("ALERTTTTTT");
              readNewCard(application);
              return;
            }
            var start = response2.indexOf("2a8468016504010101");
            start = start + 18;
            response2 = response2.substring(start);

            while (1) {

              var type = response2.substring(0, 2);

              if (type == "30") break;

              if (parseInt(response2.substring(2, 4), 16) > 127) {

                var count = parseInt(response2.substring(2, 4), 16) - 128;
                var length = "";
                var k = 1;


                for (k = 1; k <= count; k++) {

                  length += response2.substring(2 + (k * 2), 4 + (k * 2));

                }

                var total_length = parseInt(length, 16) * 2;
                response2 = response2.substr(4 + (k - 1) * 2, total_length);

              } else {

                var total_length = parseInt(response2.substring(2, 4), 16) * 2 + 4;
                response2 = response2.substr(4, total_length);

              }
            }

            //region How to work with ASN.1 strings
            let bmp_string_encoded = new ArrayBuffer(response2.length / 2); 

            let bmp_string_view = new Uint8Array(bmp_string_encoded);

            var kk = 0;

            for (var i = 0; i < (response2.length / 2); i++) {

              bmp_string_view[i] = "0x" + response2.substring(kk, kk + 2);
              kk += 2;

            }

            let bmp_string_decoded = asn1js.fromBER(bmp_string_encoded);

            if (bmp_string_decoded.offset === (-1)) return; // Error during decoding

            let obj = bmp_string_decoded.result.valueBlock.value;

            var names = obj[4].valueBlock.value[0].valueBlock.value;
            var surnames = obj[3].valueBlock.value[0].valueBlock.value;
            var index = obj[5].valueBlock.value;

            var output = [names, surnames, index];
            
            printStudent(output);

          }).catch(error => {
            console.error('Error:', error, error.stack + '\n');
          });
      }).catch(error => {
        console.error('Error:', error, error.stack + '\n');
      });
  }).catch(error => {
    console.error('Error:', error, error.stack + '\n');
  });

}

function readOldCard(application) {
  application.selectFile([0xD6, 0x16, 0x00, 0x00, 0x30, 0x01, 0x01])
  .then(response => {
            console.info(`Response: '${response}' '${response.meaning()}'`);
    application.issueCommand([0x00, 0xA4, 0x02, 0x00, 0x02, 0x00, 0x02, 0x12])
      .then(response => {
              console.info(`Response: '${response}' '${response.meaning()}'`);
        application.issueCommand([0x00, 0xB0, 0x00, 0x00, 0xF8])
          .then(response => {
              console.info(`Response: '${response}' '${response.meaning()}'`);

            var response2 = `${response}`;

            var start = response2.indexOf("2a8468016504010101");
            start = start + 18;
            response2 = response2.substring(start);

            while (1) {

              var type = response2.substring(0, 2);

              if (type == "30") break;

              if (parseInt(response2.substring(2, 4), 16) > 127) {

                var count = parseInt(response2.substring(2, 4), 16) - 128;
                var length = "";
                var k = 1;

                for (k = 1; k <= count; k++) {

                  length += response2.substring(2 + (k * 2), 4 + (k * 2));

                }

                var total_length = parseInt(length, 16) * 2;
                response2 = response2.substr(4 + (k - 1) * 2, total_length);

              } else {

                var total_length = parseInt(response2.substring(2, 4), 16) * 2 + 4;
                response2 = response2.substr(4, total_length);

              }
            }

            //region How to work with ASN.1 strings
            let bmp_string_encoded = new ArrayBuffer(response2.length / 2); 

            let bmp_string_view = new Uint8Array(bmp_string_encoded);

            var kk = 0;

            for (var i = 0; i < (response2.length / 2); i++) {

              bmp_string_view[i] = "0x" + response2.substring(kk, kk + 2);
              kk += 2;

            }

            let bmp_string_decoded = asn1js.fromBER(bmp_string_encoded);

            if (bmp_string_decoded.offset === (-1)) return; // Error during decoding

            let obj = bmp_string_decoded.result.valueBlock.value;

            var names = obj[4].valueBlock.value[0].valueBlock.value;
            var surnames = obj[3].valueBlock.value[0].valueBlock.value;
            var index = obj[5].valueBlock.value;

            var output = [names, surnames, index];
            
            printStudent(output);

          }).catch(error => {
            console.error('Error:', error, error.stack + '\n');
          });
      }).catch(error => {
        console.error('Error:', error, error.stack + '\n');
      }); }).catch(error => {
    console.error('Error:', error, error.stack + '\n');
  });
}

  var Devices = smartcard.Devices;
  var devices = new Devices();

  devices.on('device-activated', event => {
      console.log('Smart card reader active');
      var device = event.device;

      device.on('card-inserted', event => {
        var card = event.card;

        //console.log(`Card '${card.getAtr()}' inserted into '${event.device}'` + '\n');
        var Iso7816Application = smartcard.Iso7816Application;
        var application = new Iso7816Application(card);

        console.log(card.getAtr());

        if(card.getAtr() == "3bdd18008131fe4580f9a000000077010800079000fe") {
         readNewCard(application);
        } else {
         readOldCard(application);
        }
     });   
    });


//Add student manually
function createAddWindow() {
  //Create new window
  AddWindow = new BrowserWindow({
    width: 300,
    height: 400,
    title: "Add student manually"
  });

  //Load html into window
  AddWindow.loadURL(url.format({
    pathname: path.join(__dirname, "addstudent.html"),
    protocol: "file:",
    slashes: true
  }));

  //Garbage
  AddWindow.on("close", function () {
    AddWindow = null;
  });
}

function printStudent(item) {

	var dateTime = require('node-datetime');
    var dt = dateTime.create();
    var formatted = dt.format('d-m-Y H:M:S');

	item.push(formatted);
  mainWindow.webContents.send("item:add", item);

	notifier.notify({
		title: "Student registered",
		message: item[0] + " " + item[1],
		icon: path.join(__dirname, 'ok.png')

  });
  
axios.post('http://127.0.0.1:8889', JSON.stringify({
  classes_code: class_code,
  student_index: item[2],
  student_name: item[0],
  student_surname: item[1]
}))
.then((res) => {
  console.log(`statusCode: ${res.statusCode}`)
  console.log(res)
})
.catch((error) => {
  console.error(error)
})

}

//Catch
ipcMain.on("item:add", function (e, item) {

  printStudent(item);

  AddWindow.close();
})

ipcMain.on("card:read", function (e) {
  card_read();
})

ipcMain.on("set:classcode", function (e,classcode) {
    class_code = classcode;
    
    mainWindow.loadURL(url.format({
      pathname: path.join(__dirname, "index.html"),
      protocol: "file:",
      slashes: true
    }));  
})

//Menu template
const mainMenuTemplate = [{
  label: "Student",
  submenu: [{
      label: "Add student",
      accelerator: process.platfrom == "darwin" ? "Command+E" : "Ctrl+E",
      click() {
        createAddWindow();
      }
    },
    {
      label: "Quit program",
      accelerator: process.platfrom == "darwin" ? "Command+Q" : "Ctrl+Q",
      click() {
        app.quit();
      }
    }
  ]
}, {
  label: "Classes",
  submenu: [{
      label: "Add classes",
      click() {
        createAddClassesWindow();
      }
    },
    {
      label: "Pick classes",
      click() {
        createSelectClassesWindow();
      }
    }
  ]
}];

//If mac psuh empty obj to Menu
if (process.platfrom == "darwin") {
  mainMenuTemplate.unshift({});
}

//Add dev tools on DEV
if (process.env.NODE_ENV !== 'production') {
  mainMenuTemplate.push({
    label: "DEV",
    submenu: [{
        label: "Toggle dev tools",
        accelerator: process.platfrom == "darwin" ? "Command+I" : "Ctrl+I",
        click(item, focusedWindow) {
          focusedWindow.toggleDevTools();
        }
      },
      {
        role: "reload"
      }
    ]
  });
}