/*
  Rui Santos
  Complete project details at Complete project details at https://RandomNerdTutorials.com/esp32-http-get-open-weather-map-thingspeak-arduino/

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files.

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
*/
#include <Arduino.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <Arduino_JSON.h>
#include <Wire.h>
#include <Adafruit_GFX.h>     //OLEDのGFXライブラリ
#include <Adafruit_SSD1306.h> //OLEDのライブラリ
#include "NTPClient.h"


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

//OLEDの初期設定
Adafruit_SSD1306 display(128, 64, &Wire, -1);

// Your Domain name with URL path or IP address with path
String openWeatherMapApiKey = "";
// Example:
//String openWeatherMapApiKey = "bd939aa3d23ff33d3c8f5dd1dd435";

// Replace with your country code and city
String city = "Morioka";
String countryCode = "JP";

// THE DEFAULT TIMER IS SET TO 10 SECONDS FOR TESTING PURPOSES
// For a final application, check the API call limits per hour/minute to avoid getting blocked/banned
unsigned long lastTime = 0;
// Timer set to 10 minutes (600000)
//unsigned long timerDelay = 600000;
// Set timer to 10 seconds (10000)
unsigned long timerDelay = 10000;

String jsonBuffer;
WiFiUDP udp; 
NTPClient ntp(udp, "ntp.nict.jp", 32400, 60000);  
// udp, ServerName, timeOffset, updateInterval

void setup() {
  Serial.begin(115200);
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
      configTime(9 * 3600L, 0, "ntp.nict.jp", "time.google.com", "ntp.jst.mfeed.ad.jp");//NTPの設定

  }
  ntp.begin();

  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());
 
  Serial.println("Timer set to 10 seconds (timerDelay variable), it will take 10 seconds before publishing the first reading.");

 //OLEDの初期化
  display.clearDisplay();
  display.setTextColor(WHITE);
}
  
 
void loop() {
  // Send an HTTP GET request
  if ((millis() - lastTime) > timerDelay) {
    // Check WiFi connection status
    if(WiFi.status()== WL_CONNECTED){
      String serverPath = "http://api.openweathermap.org/data/2.5/weather?q=" + city + "," + countryCode + "&APPID=" + openWeatherMapApiKey;
      
      jsonBuffer = httpGETRequest(serverPath.c_str());
      Serial.println(jsonBuffer);
      JSONVar myObject = JSON.parse(jsonBuffer);
  
      // JSON.typeof(jsonVar) can be used to get the type of the var
      if (JSON.typeof(myObject) == "undefined") {
        Serial.println("Parsing input failed!");
        return;
      }
      ntp.update();
      String formattedTime = ntp.getFormattedTime();  // hh:mm:ss

      double tempc = myObject["main"]["temp"];
      int prs = myObject["main"]["pressure"];
      int hum = myObject["main"]["humidity"];
      double speed = myObject["wind"]["speed"];
      int cloud = myObject["clouds"]["all"];

  //OLEDへの距離の表示
  display.clearDisplay();
  display.setCursor(0,0);
  display.setTextSize(1);
  display.print("Update: ");
  display.println(formattedTime);
  display.print("Weather: ");
  display.println(myObject["weather"][0]["main"]);
  display.print("Temp.: ");
  display.printf("%2.1f C\n", tempc-273.15);
  display.print("Pressure: ");
  display.printf("%4d hPa\n", prs);
  display.print("Humidity: ");
  display.printf("%2d %%\n", hum);
  display.print("Wind Speed: ");
  display.printf("%2.2f m/s\n", speed);
  display.print("Clouds: ");
  display.printf("%3d %%\n", cloud);
  display.display();

      Serial.println(formattedTime);
      Serial.print("JSON object = ");
      Serial.println(myObject);
      Serial.print("TemperatureC: ");
      Serial.println(tempc-273.15);
      //Serial.print("Temperature: ");
      //Serial.println(myObject["main"]["temp"]);
      Serial.print("Pressure: ");
      Serial.println(myObject["main"]["pressure"]);
      Serial.print("Humidity: ");
      Serial.println(myObject["main"]["humidity"]);
      Serial.print("Wind Speed: ");
      Serial.println(myObject["wind"]["speed"]);
      Serial.print("Clouds: ");
      Serial.println(myObject["clouds"]["all"]);
    }
    else {
      Serial.println("WiFi Disconnected");
    }
    lastTime = millis();
  }
}

String httpGETRequest(const char* serverName) {
  WiFiClient client;
  HTTPClient http;
    
  // Your Domain name with URL path or IP address with path
  http.begin(client, serverName);
  
  // Send HTTP POST request
  int httpResponseCode = http.GET();
  
  String payload = "{}"; 
  
  if (httpResponseCode>0) {
    Serial.print("HTTP Response code: ");
    Serial.println(httpResponseCode);
    payload = http.getString();
  }
  else {
    Serial.print("Error code: ");
    Serial.println(httpResponseCode);
  }
  // Free resources
  http.end();

  return payload;
}