// Keyboard wiring
var KEYROW = [B10,B13,B14,B15, B6,B5,B4,B3];
var KEYCOL = [A4,A3,A2,A1, B9,B8,A8,B7];

// Key Maps for Keyboard
var KEYMAPLOWER = [
  "`1234567890-=\x08",
  "\tqwertyuiop[]\n",
  "\0asdfghjkl;'#\x84\x82\x85",
  "\x01\\zxcvbnm,./ \x80\x83\x81",
  ];
var KEYMAPUPPER = [
  "¬!\"£$%^&*()_+\x08",
  "\tQWERTYUIOP{}\n",
  "\0ASDFGHJKL:@~\x84\x82\x85",
  "\x01|ZXCVBNM<>? \x80\x83\x81",
  ];

/* If a char in the keymap is >=128, 
subtract 128 and look in this array for
multi-character key codes*/
var KEYEXTRA = [
  String.fromCharCode(27,91,68), // 0x80 left
  String.fromCharCode(27,91,67), // 0x81 right
  String.fromCharCode(27,91,65), // 0x82 up
  String.fromCharCode(27,91,66), // 0x83 down
  String.fromCharCode(27,91,53,126), // 0x84 page up
  String.fromCharCode(27,91,54,126), // 0x85 page down
];
// Shift status
var hasShift = false;
function setShift(s) {
  hasShift = s;
  digitalWrite(LED1, s);
}

// Convert an actual key into a sequence of characters
// And send to Loopback (where the console is)
function handleKeyPress(e) {
  var kx = e>>3;
  var ky = e&7;
  if (ky>3) { // turn into long row
    kx+=8;
    ky-=4;
  }
  var key = hasShift ? KEYMAPUPPER[ky][kx] : KEYMAPLOWER[ky][kx];
  if (key=="\x01") {
    setShift(!hasShift);
  } else { 
    setShift(false);
    if (key && key.length) {
      if (key.charCodeAt(0)>127)
        key = KEYEXTRA[key.charCodeAt(0)-128];
      //USB.write(JSON.stringify(key)+"\r\n"); // debug
      LoopbackB.write(key);
    }
  }
}

var term; // the terminal
var g; // graphics

function onInit() {
  // set up the keypad
  require("KeyPad").connect(KEYROW, KEYCOL, handleKeyPress);
  // Start TV out
  g = require('tv').setup({ type : "vga",
    video : A7,
    hsync : A6,
    vsync : A5,
    width : 320,
    height : 240,
    repeat : 2, // amount of times to repeat each line
  });
  // use a larger font instead of the default
  require("Font8x12").add(Graphics);
  g.setFont8x12();

  // Set up the terminal
  term = require("VT100").connect(g, {
    charWidth : 8,
    charHeight : 12,
    marginTop : 10, // might want to tweak these depending on your monitor
    marginLeft : 20,
    marginBottom : 16
  });

  // take characters from Espruino, and push them into the VT100 terminal
  LoopbackB.on('data',function(e){
    for (var i in e) term.char(e[i]);
  });
  // copy characters coming down USB into the 'loopback' device
  USB.on('data',function(e){ LoopbackB.write(e); });
  // Now move the console to Loopback
  LoopbackA.setConsole();
}