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#include <HID-Project.h>
#include <HID-Settings.h>
#include <TimerOne.h>

//debounce milliseconds
const int debounce = 5;
//Switch Pins
const byte k[4] = { 4, 5, 6, 7 };
//Switch status
boolean s[4] = { 0, 0, 0, 0 };

//M for Media Key, K for Keyboard
const char codetype[4] = { 'K', 'K', 'K', 'K' };

//Keycodes
const ConsumerKeycode ccode[4] = { MEDIA_VOLUME_MUTE,
MEDIA_VOLUME_MUTE,
MEDIA_PLAY_PAUSE,
MEDIA_PLAY_PAUSE
};

const KeyboardKeycode kcode[4] = { KEY_LEFT_ARROW,
KEY_DOWN_ARROW,
KEY_UP_ARROW,
KEY_RIGHT_ARROW
};
byte col = 0;
byte leds[2][2];
const int keyfade = 40;
const char curve[] = {
0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5, 6, 6, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 1
};
const int fadecount = 2;
const unsigned long breathcount = 5000;
int fadecounter = 0;
unsigned long breathcounter = 0;
byte pass = 1;

// pin[xx] on led matrix connected to nn on Arduino (-1 is dummy to make array start at pos 1)
int pins[6] = {
-1, 18, 19, 20, 21
};

// col[xx] of leds = pin yy on led matrix
int cols[2] = {
pins[2], pins[1]
};

// row[xx] of leds = pin yy on led matrix
int rows[2] = {
pins[4], pins[3]
};



void setup() {
Keyboard.begin();
Consumer.begin();
setupLeds();
onLeds();
//setup inputs, turn on pullups
for (int i = 0; i < 4; i++) {
pinMode(k[i], INPUT);
digitalWrite(k[i], 1);
}
}

void loop() {
CheckKeys();
delay(debounce);

fadecounter++;
if (fadecounter > fadecount) {
fadecounter = 0;
fade();
}
breathcounter++;
if (breathcounter > breathcount) {
breathcounter = 0;
fadecounter = 0;
breath();
}
}

void CheckKeys() {
for (int i = 0; i < 4; i++) {
if (codetype[i] == 'M') {
if (digitalRead(k[i]) == 0) {
if (s[i] == 0) {
Consumer.press((ccode[i]));
s[i] = 1;
byte row = i / 2;
byte col = i % 2;
leds[col][row] = 60;
breathcounter = 0;
}
}
else {
if (s[i] == 1) {
s[i] = 0;
Consumer.release((ccode[i]));
byte row = i / 2;
byte col = i % 2;
leds[col][row] = 60;
breathcounter = 0;
}
}
}
if (codetype[i] == 'K') {
if (digitalRead(k[i]) == 0) {
if (s[i] == 0) {
Keyboard.press((kcode[i]));
s[i] = 1;
byte row = i / 2;
byte col = i % 2;
leds[col][row] = 60;
breathcounter = 0;
}
}
else {
if (s[i] == 1) {
s[i] = 0;
Keyboard.release((kcode[i]));
byte row = i / 2;
byte col = i % 2;
leds[col][row] = 60;
breathcounter = 0;
}
}
}
}
}

void setupLeds() {
// sets the pins as output
for (int i = 1; i <= 4; i++) {
pinMode(pins[i], OUTPUT);
}

// set up cols and rows
for (int i = 1; i <= 2; i++) {
digitalWrite(cols[i - 1], HIGH);
}

for (int i = 1; i <= 2; i++) {
digitalWrite(rows[i - 1], LOW);
}

clearLeds();

// Set refresh rate (interrupt timeout period)
Timer1.initialize(500);
// Set interrupt routine to be called
Timer1.attachInterrupt(display);
}

void clearLeds() {
// Clear display array
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
leds[i][j] = 0;
}
}
}

void onLeds() {
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
leds[i][j] = keyfade;
}
}
}

void fade() {
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
if (leds[i][j] > 0) {
leds[i][j] = leds[i][j] - 1;
}
}
}
}

void breath() {
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
leds[i][j] = 60;
}
}
}

// Interrupt routine
void display() {
digitalWrite(cols[col], HIGH); // Turn whole previous column off
col++;
if (col == 2) {
col = 0;
pass++;
if (pass > 8) {
pass = 1;
}
}
for (int row = 0; row < 2; row++) {
if (curve[leds[col][row]] > pass) {
digitalWrite(rows[row], HIGH); // Turn on this led
}
else {
digitalWrite(rows[row], LOW); // Turn off this led
}
}
digitalWrite(cols[col], LOW); // Turn whole column on at once (for equal lighting times)
}

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