#define LDR_PIN 2
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
const char* ssid = "Wokwi-GUEST";
const char* password = "";

LiquidCrystal_I2C lcd(0x27, 20, 10);
/**************************************************/
/* 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";

float USD,EUR;
const char* date;

void setup() {
  pinMode(LDR_PIN, INPUT);
  lcd.init();
  lcd.backlight();

  Serial.begin(115200);
  WiFi.begin(ssid, password);

  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.print("OK! IP=");
  Serial.println(WiFi.localIP());

  Serial.print("Fetching ");
  Serial.print(server);
   
}

void loop() {
  Tauxdechange(date,USD,EUR);
  WiFiClient client;
  HTTPClient http;


  Serial.print("[HTTP] begin...\n");
    if (http.begin(client, server)) {  
            
    Serial.print("[HTTP] GET...\n");
     
    http.addHeader("Content-Type","application/json");

    int httpResponseCode = http.GET();

    if (httpResponseCode > 0) {
        
        Serial.printf("[HTTP] GET... code: %d\n", httpResponseCode);

        
        if (httpResponseCode == HTTP_CODE_OK || httpResponseCode == HTTP_CODE_MOVED_PERMANENTLY) {
        String jsonfile= http.getString();
        Serial.println(jsonfile);
        
        DynamicJsonDocument doc(512);
        DeserializationError error =deserializeJson(doc,jsonfile);

        if (error) {
         Serial.print("deserializeJson() failed");
          Serial.println(error.c_str());
         return;
        }
         date = doc["date"];
         USD = doc["rates"]["USD"];
         EUR = doc["rates"]["EUR"];
        Serial.print("la date est ");
        Serial.println(date);
        Serial.print("les rates en USD est ");
        Serial.println(USD);
        Serial.print("les rates en EUR est ");
        Serial.println(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(10000);

}

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);
  lcd.setCursor(2, 3);
  lcd.print("EUR:");
  lcd.print(EUR);

  delay(5000);
  }