#define LDR_PIN 2
#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);
/**************************************************/
/* ajouter les lignes de code afin d'afficher sur la ligne vide de l'afficheur LCD 
 le taux de change de devis (le résultat souhaité: https://ibb.co/BySF3Ys) 
NB: vous devez récupérer les informations de taux de change par la méthode HTTP GET
   */

/**************************************************/

const char* server = "http://api.exchangerate.host/latest?base=TND&symbols=USD,EUR,CZK";
const char* ssid = "Wokwi-GUEST";
const char* password = "";
String payload;

float USD,EUR;
const char* date;

void setup() {
  Serial.begin(115200);
  // pin setup
  pinMode(LDR_PIN, INPUT);
  // lcd setup
  lcd.init();
  lcd.backlight();
  // wifi setup 
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

   
}

void loop() {
  WiFiClient client;
  HTTPClient http;

  if (http.begin(client, server)) {
    
    int httpResponseCode = http.GET(); 
    if(httpResponseCode>0){
      Serial.printf("HTTP GET code : %d",httpResponseCode);
      if(httpResponseCode == HTTP_CODE_OK || httpResponseCode == HTTP_CODE_MOVED_PERMANENTLY){
        String payload = http.getString();
        Serial.println(payload);
                  
        StaticJsonDocument<1024> doc;
        DeserializationError error =deserializeJson(doc,payload);

        if (error) {
         Serial.print("deserializeJson() failed");
          Serial.println(error.c_str());
         return;
            }
        
        Serial.println(payload);
        Serial.println("....................................................");
        const char* date = doc["date"];
        float usd = doc["rates"]["USD"];
        float eur = doc["rates"]["EUR"];
        Serial.printf("date : %s \n",date);
        Serial.printf("USD= %.2f \n",usd);
        Serial.printf("EUR= %.2f \n",eur);
        Tauxdechange(date,usd,eur); 
      }

    }else {
      Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpResponseCode).c_str());
    }
    http.end();

  }else{
    Serial.printf("[HTTP} Unable to connect\n");
  }

  
delay(2000);
}

void Tauxdechange(const char* date,float USD, float EUR) {
 
      lcd.setCursor(1, 0);
  lcd.print("FST:Taux de change");
  lcd.setCursor(2, 1);
  lcd.print("date:");
  lcd.print(date);
  lcd.setCursor(2, 2);
  lcd.print("USD:");
  lcd.print(USD,5);
  lcd.setCursor(2, 3);
  lcd.print("EUR:");
  lcd.print(EUR,5);
  

  delay(5000);
  }