//************************************************
// Da implementare per risparmio energetico:
//  1. Spegnere periferiche:
//      - power_adc_disable();
//      - power_spi_disable();
//      - power_twi_disable();
//      - power_timer0_disable();
//
//  2. Sleep mode arudino.
//  3. Spegnere backlight
// 
// 
//************************************************

#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>
#include <DHT.h>
#include <avr/sleep.h>
#include <avr/power.h>
#include "img.h"

// Button
#define BTN          4
volatile bool        wake_flag = false;
unsigned long        awake_time     = 0;
const unsigned long  awake_duration = 2000; // per quanto resta acceso 
bool                 prev_btn_flag  = LOW;

// TFT
#define TFT_CS   10
#define TFT_DC   3
#define TFT_RST  8
#define TFT_BL   7
Adafruit_ILI9341 tft(TFT_CS, TFT_DC, TFT_RST);

// DHT
#define DHTPIN 2
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Sensori suolo
#define SOIL_PIN_1 A0 
#define SOIL_PIN_2 A1
#define SOIL_PIN_3 A2


void setup() {
  Serial.begin(9600);

  pinMode(BTN,    INPUT);
  pinMode(TFT_BL, OUTPUT);

  digitalWrite(TFT_BL, LOW);

  dht.begin();

  tft.begin();
  tft.setRotation(1);
  tft.fillScreen(ILI9341_BLACK);
  tft.setTextColor(ILI9341_WHITE);
  tft.setTextSize(3);

  for (int i = 0; i < sizeof(plant); i++) {
    inverted[i] = ~pgm_read_byte(&plant[i]);
  }
}

void loop() {

  // Lettura DHT
  float H = dht.readHumidity();
  float T = dht.readTemperature();

  // Lettura suoli e conversione !!! DA TARARE !!!
  int soilRaw_1      = analogRead(SOIL_PIN_1);
  int soil_percent_1 = map(soilRaw_1, 1023, 300, 0, 100);
      soil_percent_1 = constrain(soil_percent_1, 0, 100);

  int soilRaw_2      = analogRead(SOIL_PIN_2);
  int soil_percent_2 = map(soilRaw_2, 1023, 300, 0, 100);
      soil_percent_2 = constrain(soil_percent_2, 0, 100);

  int soilRaw_3      = analogRead(SOIL_PIN_3);
  int soil_percent_3 = map(soilRaw_3, 1023, 300, 0, 100);
      soil_percent_3 = constrain(soil_percent_3, 0, 100);

  if (wake_flag) {
    // Display
    tft.fillScreen(ILI9341_BLACK);

    // Print Temperatura Serra
    tft.setCursor(T_x, T_y);
      tft.print(T);
      tft.print("C");

    // Print Umidità Serra
    tft.setCursor(H_x, H_y);
      tft.print(H);
      tft.print("%");


    // *** Draw plants and humidities *******************
    // Plant 1
    tft.setCursor(plant_x0 + 10, plant_hum_y);
    tft.print(soil_percent_1);
    tft.print("%");  
    if      (soil_percent_1 >= 50)                       tft.drawBitmap(plant_x0, plant_y, inverted, plant_w, plant_h, ILI9341_GREEN);
    else if (soil_percent_1 > 25 && soil_percent_1 < 50) tft.drawBitmap(plant_x0, plant_y, inverted, plant_w, plant_h, ILI9341_YELLOW);
    else                                                 tft.drawBitmap(plant_x0, plant_y, inverted, plant_w, plant_h, ILI9341_RED);
    
    // Plant 2
    tft.setCursor(plant_x1 + 10, plant_hum_y);
    tft.print(soil_percent_2);
    tft.print("%");
    if      (soil_percent_2 >= 50)                       tft.drawBitmap(plant_x1, plant_y, inverted, plant_w, plant_h, ILI9341_GREEN);
    else if (soil_percent_2 > 25 && soil_percent_2 < 50) tft.drawBitmap(plant_x1, plant_y, inverted, plant_w, plant_h, ILI9341_YELLOW);
    else                                                 tft.drawBitmap(plant_x1, plant_y, inverted, plant_w, plant_h, ILI9341_RED);

    // Plant 3
    tft.setCursor(plant_x2 + 10, plant_hum_y);
    tft.print(soil_percent_3);
    tft.print("%");
    if      (soil_percent_3 >= 50)                       tft.drawBitmap(plant_x2, plant_y, inverted, plant_w, plant_h, ILI9341_GREEN);
    else if (soil_percent_3 > 25 && soil_percent_2 < 50) tft.drawBitmap(plant_x2, plant_y, inverted, plant_w, plant_h, ILI9341_YELLOW);
    else                                                 tft.drawBitmap(plant_x2, plant_y, inverted, plant_w, plant_h, ILI9341_RED);
  }
  //**********************************************  




// *** Power save mode **************************************
// Per il momento mantiene il pin BL alto per 10 secondi e poi lo spegne.
  bool btn_flag = digitalRead(BTN);

  if (btn_flag == LOW && prev_btn_flag == HIGH) {
    digitalWrite(TFT_BL, HIGH);
    awake_time = millis();
    wake_flag = true;
  }

  prev_btn_flag = btn_flag;

  if (wake_flag && (millis() - awake_time >= awake_duration)) {
    digitalWrite(TFT_BL, LOW);
    wake_flag = false;
  }
//************************************************************

Serial.println(digitalRead(TFT_BL));
  // delay(2000);
}