/* ============================================
  code is placed under the MIT license
  Copyright (c) 2023 J-M-L
  For the Arduino Forum : https://forum.arduino.cc/u/j-m-l

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  ===============================================
*/

#include <Wire.h>
#include <hd44780.h>                        // main hd44780 header
#include <hd44780ioClass/hd44780_I2Cexp.h>  // i2c expander i/o class header
#include "Sonde.h"

// LE LCD
const uint8_t nbColonnes = 16;
const uint8_t nbLignes = 2;
hd44780_I2Cexp lcd;
byte barre[] = {0b00100, 0b00100, 0b00100, 0b00100, 0b00100, 0b00100, 0b00100, 0b00100};

// Les sondes
Sonde sondes[] = {
  { 7, "S1"},
  { 6, "S2"},
};
constexpr size_t nombreDeSondes = sizeof sondes / sizeof * sondes;

// le relai
enum {INITIALISATION, S0_PLUS_GRANDE, S1_PLUS_GRANDE} etatSonde = INITIALISATION;

const byte pinRelai = 11;
constexpr byte relaiOn  = HIGH; // mettre HIGH ou LOW en fonction du type de relai
constexpr byte relaiOff = (relaiOn == LOW) ? HIGH : LOW; // calculé automatiquement pour être l'autre état

const byte tailleMaxTxt = 12;
char affichageTemperature[nombreDeSondes][tailleMaxTxt];

void gestionTemperatures() {
  // on met à jour les températures
  char tmpTxt[tailleMaxTxt];
  float tempSonde[nombreDeSondes];
  for (byte i = 0; i < nombreDeSondes; i++) {
    tempSonde[i] = sondes[i].temperature();
    if (! isnan(tempSonde[i])) {
      dtostrf(tempSonde[i], 1, 1, tmpTxt); // conversion en chaîne de caractères
      if (strcmp(tmpTxt, affichageTemperature[i]) != 0) {
        // le texte a changé on effectue le nouvel affichage
        lcd.setCursor(0, i);
        for (byte i = 0; i < 10; i++) lcd.write(' '); // on efface ce qui était là avant
        lcd.setCursor(0, i);
        lcd.print(sondes[i].nom);
        lcd.print(":");
        lcd.print(tmpTxt);
        lcd.write(0xDF); // symbole °
        strcpy(affichageTemperature[i], tmpTxt); // on mémorise ce qui est affiché
      }
    }
  }

  // on gère le relai

  if (nombreDeSondes >= 2) { // si on a plus de deux sondes
    // on utilise alors les sondes 0 et 1 pour décider de l'état du relai
    switch (etatSonde) {
      case INITIALISATION:
        if (tempSonde[0] > tempSonde[1]) {
          etatSonde = S0_PLUS_GRANDE;
          lcd.setCursor(12, 0); lcd.print("+++");
          digitalWrite(pinRelai, relaiOn);
        } else {
          etatSonde = S1_PLUS_GRANDE;
          digitalWrite(pinRelai, relaiOff);
          lcd.setCursor(12, 1); lcd.print("+++");
          digitalWrite(pinRelai, relaiOff);
        }
        break;
      case S0_PLUS_GRANDE:
        if (tempSonde[1] > tempSonde[0]) {
          etatSonde = S1_PLUS_GRANDE;
          digitalWrite(pinRelai, relaiOff);
          lcd.setCursor(12, 0); lcd.print("   ");
          lcd.setCursor(12, 1); lcd.print("+++");
        }
        break;

      case S1_PLUS_GRANDE:
        if (tempSonde[0] > tempSonde[1]) {
          etatSonde = S0_PLUS_GRANDE;
          digitalWrite(pinRelai, relaiOn);
          lcd.setCursor(12, 0); lcd.print("+++");
          lcd.setCursor(12, 1); lcd.print("   ");
        }
        break;
    }


  }
}

void setup() {
  pinMode(pinRelai, OUTPUT);
  digitalWrite(pinRelai, relaiOff);
  for (Sonde& s : sondes) s.begin();
  Serial.begin(115200);
  int result = lcd.begin(nbColonnes, nbLignes);
  if (result) {
    Serial.print("problème LCD: ");
    Serial.println(result);
    hd44780::fatalError(result);
  }
  lcd.createChar(0, barre);
  // on dessine la barre de séparation
  for (byte i = 0; i < nbLignes; i++) {
    lcd.setCursor(10, i);
    lcd.write(0);
  }
}

void loop() {
  gestionTemperatures();
}