//3.3 for esp, 5v for external voltage soruces 5-14V
//CS to arduino is 10+, connected to esp16 here
//D/C command pin 9+ on arduino esp 17 here
//scl 22, sda 21
//cs,dc, sclk any just define
//does dc and cs have to be 15 and 2? tried 17 16 

//size of screen is 240x320
#include "SPI.h"
#include <TFT_eSPI.h>
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"

#include <Wire.h>      // this is needed for FT6206
#include <Adafruit_FT6206.h>

#define TFT_DC 16
#define TFT_CS 17
// #define TFT_MOSI 23
// #define TFT_SCLK 18
#define BUTTON_SIZE 40
#define BUTTON_SPACING 5
#define SCREEN_X 240
#define SCREEN_Y 320
//NEED TO TRY ESPI VARIANT
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);
// TFT_eSPI tft = TFT_eSPI();
Adafruit_FT6206 ctp = Adafruit_FT6206();

//button class?
typedef struct {
  int id;
  int x;
  int y;
}Button;

//dynamic memory allocation?
#define MAX_BUTTONS 40
Button buttons[MAX_BUTTONS];
int buttonCount = 0;

void setup() {
  tft.begin();
   
  Serial.begin(115200);
  Serial.println(F("Cap Touch Paint!"));
  
  if (! ctp.begin(40)) {  // pass in 'sensitivity' coefficient
    Serial.println("Couldn't start FT6206 touchscreen controller");
    while (1);
  }

  Serial.println("Capacitive touchscreen started");

  //drawing some text:
  //----------------------------------
  // tft.setCursor(26, 120);
  // tft.setTextColor(ILI9341_RED);
  // tft.setTextSize(3);
  // tft.println("Hello, TFT!");

  // tft.setCursor(20, 160);
  // tft.setTextColor(ILI9341_GREEN);
  // tft.setTextSize(2);
  // tft.println("I can has colors?");
  //-----------------------------------

  drawButtons(BUTTON_SIZE, BUTTON_SPACING);
  Serial.println("HELLO");
  
}

void loop() { 

  if (!ctp.touched()) {
    delay(10); // Speeds up the simulation
    return;
  }

  // Retrieve a point  
  TS_Point p = ctp.getPoint();

  //flip it around to match the screen.
  p.x = map(p.x, 0, 240, 240, 0);
  p.y = map(p.y, 0, 320, 320, 0);

  // Print out the remapped (rotated) coordinates
  Serial.print("("); Serial.print(p.x);
  Serial.print(", "); Serial.print(p.y);
  Serial.println(")");

  for(int i = 0; i < buttonCount; ++i){
     if (p.x >= buttons[i].x && p.x <= buttons[i].x + BUTTON_SIZE &&
        p.y >= buttons[i].y && p.y <= buttons[i].y + BUTTON_SIZE) {
      Serial.print("Button "); Serial.print(i); Serial.println(" pressed!");
      // displayButtonNumber(i);
      break;
    }
  }

}

void drawButtons(int buttonSize, int buttonSpacing){
  int x = BUTTON_SPACING;
  int y = 0;
  buttonCount = 0;

  while(1){

    //checking if we need to add a new row
    if(x + BUTTON_SIZE > SCREEN_X){
      Serial.println("new row!");
      x = BUTTON_SPACING;
      y = y + BUTTON_SPACING + BUTTON_SIZE;
    }
    //checking if all buttons have been drawn - cannot draw next row
    if(y + BUTTON_SIZE > SCREEN_Y){
      Serial.println("no more rows!");
      break;
    }
    //drawing a button
    tft.fillRect(x, y, BUTTON_SIZE, BUTTON_SIZE, ILI9341_RED);

    buttons[buttonCount].x = x;
    buttons[buttonCount].y = y;
    buttons[buttonCount].id = buttonCount;
    buttonCount++;

    x = x + BUTTON_SPACING + BUTTON_SIZE;
  }
  
}