/*
  ESP32 HTTPClient Messagebox

  Copyright (C) 2022, Florian M.
*/

#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";

#define BTN_PIN 5
#define LED_PIN 4
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SSD1306_NO_SPLASH
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

const String url = "https://mbox-9a811-default-rtdb.europe-west1.firebasedatabase.app/messages.json?orderBy=\"date\"&startAt=3&endAt=400000000000&limitToLast=1";

String getJoke() {
  HTTPClient http;
  http.useHTTP10(true);
  http.begin(url);
  http.GET();
  String result = http.getString();

  DynamicJsonDocument doc(2048);
  DeserializationError error = deserializeJson(doc, result);

  // Test if parsing succeeds.
  if (error) {
    Serial.print("deserializeJson() failed: ");
    Serial.println(error.c_str());
    return "<error>";
  }

  String msg = doc["msg"].as<String>();
  //if (msg == NULL) {
    Serial.println("HTTP GET failed: ");
    Serial.println(result);
  //}
  http.end();
  return msg;
}

void nextJoke() {
  display.clearDisplay();
  display.setCursor(0,0);             // Start at top-left corner
  //display.println(F("Chargement du message..."));

  String joke = getJoke();
  display.println(joke);
  display.display();
}

void setup() {
  Serial.begin(115200);
  pinMode(BTN_PIN, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT);

  WiFi.begin(ssid, password, 6);

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  
  display.clearDisplay();
  display.setCursor(0,0);             // Start at top-left corner

  display.setTextSize(1);             // Normal 1:1 pixel scale
  display.setTextColor(WHITE);        // Draw white text
  display.println(F("Connection au WiFi"));

  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    display.print(F("."));
  }

  display.println(F("OK ! IP="));
  display.println(WiFi.localIP());
  display.display();

  nextJoke();
}

void loop() {
  if (digitalRead(BTN_PIN) == LOW) {
    nextJoke();
  }
  delay(100);

  // LED
  digitalWrite(LED_PIN, HIGH);
  delay(500);
  digitalWrite(LED_PIN, LOW);
  delay(500);
}