//<File !Start!>
// Varous system includes
#include <Arduino.h>
//<File !End!>

// Various library includes
#include <Adafruit_NeoPixel.h>
#include <Adafruit_GFX.h>

//<Includes !Start!>
//<Includes !End!>

#include <Adafruit_ILI9341.h>
#include <BBQ10Keyboard.h>
#include <CircularBuffer.h>

// Various local includes
#include "serial_debugger_GSLC.h"

// Battery level measurement
#define VBATPIN A6
float measuredVBat;
int batteryPercent;

// TFT Setup
#define TFT_CS 9
#define TFT_DC 10
Adafruit_ILI9341 tft(TFT_CS, TFT_DC);
#include <Fonts/FreeMono9pt7b.h>
#define CHARS_HORIZONTAL 28
#define CHARS_ROWS 13
CircularBuffer<char,364> textBuffer;

// Keyboard
BBQ10Keyboard keyboard;
#define KBD_BTN_1 0x06
#define KBD_BTN_2 0x11
#define KBD_BTN_3 0x07
#define KBD_BTN_4 0x12
#define KBD_SW_UP 0x01
#define KBD_SW_DN 0x02
#define KBD_SW_LF 0x03
#define KBD_SW_RT 0x04
#define KBD_SW_OK 0x05
// NeoPixels
#define PIXELS_NUM_BOARD 1
#define PIXELS_NUM_WING 1
#define PIXELS_WING_PIN 11
Adafruit_NeoPixel pixels_board(PIXELS_NUM_BOARD, PIN_NEOPIXEL, NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel pixels_wing(PIXELS_NUM_WING, PIXELS_WING_PIN, NEO_GRB + NEO_KHZ800);

// Various loop handlers
void handlerKeyboard();
void handlerBatteryLevel();

// GUI Slice
gslc_tsElemRef* m_pElemBatteryLevel= NULL;
gslc_tsElemRef* m_pElemStatusText = NULL;
gslc_tsElemRef* m_pElemText       = NULL;
gslc_tsElemRef* m_pTextSlider     = NULL;
static int16_t DebugOut(char ch) { if (ch == (char)'\n') Serial.println(""); else Serial.write(ch); return 0; }
bool CbSlidePos(void* pvGui,void* pvElemRef,int16_t nPos);

void setup() {
  Serial.begin(115200);

  // Setup red LED to indicate device is on (in case we disable NeoPixel battery level later)
  pinMode(3, OUTPUT);
  digitalWrite(3, HIGH);

  // Setup NeoPixels
  pixels_board.begin();
  pixels_wing.begin();
  pixels_board.clear();
  pixels_wing.clear();
  pixels_board.setBrightness(10);
  pixels_wing.setBrightness(5);

  // Start with blank wing indicator
  pixels_wing.show();

  // Green : pixels.Color(0, 255, 0)
  // Yellow : pixels.Color(255, 255, 0)
  // Orange : pixels.Color(255, 128, 0)
  // Red : pixels.Color(255, 0, 0)
  pixels_board.setPixelColor(0, pixels_board.Color(0, 0, 255));
  pixels_board.show();

  // Setup BBQ10Keyboard
  Wire.begin();
  keyboard.begin();
  keyboard.setBacklight(0.5f);

  // GUI Slice (TFT is setup through GUI Slice)
  gslc_InitDebug(&DebugOut);
  InitGUIslice_gen();
}

 // Main program via the Arduino standard methods 
void loop() {
  // Handle keyboard events
  handlerKeyboard();

  // Update battery level as appropriate
  handlerBatteryLevel();

  // Update UI
  gslc_Update(&m_gui);
}

// Keyboard handler
void handlerKeyboard() {
  // Check if keys were pressed
  if (keyboard.keyCount()) {
    // Get keyboard event
    const BBQ10Keyboard::KeyEvent key = keyboard.keyEvent();

    char output[28];
    snprintf(output, 28, "key: '%c' (dec %d, hex %02x)", key.key, key.key, key.key);
    for (int i=0; i<sizeof(output); i++) {
      char toPush = output[i];
      if (toPush != '\0') {
        textBuffer.push(toPush);
      }
      else if (toPush == '\0') {
        textBuffer.push('\n');
        break;
      }
    }
    
    // Add keycodes to text box
    for (int i=0; i<textBuffer.size(); i++) {
      //tft.print(textBuffer[i]);
    }

    // Pick color for signaling a key was pressed (short or long press)
    uint32_t keyboard_pixel_color = pixels_wing.Color(0, 0, 255);
    if (key.state == BBQ10Keyboard::StateLongPress) {
      keyboard_pixel_color = pixels_wing.Color(0, 255, 255);
    }
  
    // Display indicator accordingly
    if (key.state == BBQ10Keyboard::StatePress || key.state == BBQ10Keyboard::StateLongPress) {
      pixels_wing.setPixelColor(0, keyboard_pixel_color);
      pixels_wing.show(); 
    } 
    else {
      pixels_wing.clear();
      pixels_wing.show();
    }
  }
}

// Measure battery level and change NeoPixel accordingly
void handlerBatteryLevel() {
  measuredVBat = analogRead(VBATPIN);
  measuredVBat *= 2;    // we divided by 2, so multiply back
  measuredVBat *= 3.3;  // Multiply by 3.3V, our reference voltage
  measuredVBat /= 1024; // convert to voltage
  batteryPercent = (measuredVBat / 3.3) * 100;

  gslc_tsColor colorForHeaderElements;
  if (batteryPercent >= 75) {
    pixels_board.setPixelColor(0, pixels_board.Color(0, 255, 0));
    colorForHeaderElements = GSLC_COL_GREEN;
  }
  else if (batteryPercent >= 50) {
    colorForHeaderElements = GSLC_COL_YELLOW;
    pixels_board.setPixelColor(0, pixels_board.Color(255, 255, 0));
  }
  else if (batteryPercent >= 25) {
    colorForHeaderElements = GSLC_COL_ORANGE;
    pixels_board.setPixelColor(0, pixels_board.Color(255, 128, 0));
  }
  else {
    colorForHeaderElements = GSLC_COL_RED;
    pixels_board.setPixelColor(0, pixels_board.Color(255, 0, 0));
  }

  gslc_ElemXProgressSetVal(&m_gui, m_pElemBatteryLevel, batteryPercent);
  gslc_tsXProgress*  pGauge  = (gslc_tsXProgress*)gslc_GetXDataFromRef(&m_gui,m_pElemBatteryLevel,GSLC_TYPEX_PROGRESS,__LINE__);
  pGauge->colGauge = colorForHeaderElements;
  gslc_ElemSetTxtCol(&m_gui, m_pElemBatteryLevel, colorForHeaderElements);
  gslc_ElemSetTxtCol(&m_gui, m_pElemStatusText, colorForHeaderElements);

  // Update GUI and NeoPixel with battery status information
  gslc_Update(&m_gui);
  pixels_board.show();
}

// Slider callback function
bool CbSlidePos(void* pvGui,void* pvElemRef,int16_t nPos) {
  gslc_tsGui*     pGui     = (gslc_tsGui*)(pvGui);
  gslc_tsElemRef* pElemRef = (gslc_tsElemRef*)(pvElemRef);
  gslc_tsElem*    pElem    = gslc_GetElemFromRef(pGui,pElemRef);
  int16_t         nVal;

  // From the element's ID we can determine which slider was updated.
  switch (pElem->nId) {
    case E_TXTSCROLL:
      // Fetch the slider position
      nVal = gslc_ElemXSliderGetPos(pGui,m_pTextSlider);
      break;
    default:
      break;
  }

  return true;
}

//<Checkbox Callback !Start!>
//<Checkbox Callback !End!>
//<Keypad Callback !Start!>
//<Keypad Callback !End!>
//<Spinner Callback !Start!>
//<Spinner Callback !End!>
//<Listbox Callback !Start!>
//<Listbox Callback !End!>