#include "WiFi.h"
#include <WiFiClient.h>
#include <HTTPClient.h>
#include <LiquidCrystal_I2C.h>
#include <ArduinoJson.h>

#define SSID  "Wokwi-GUEST"
#define PASS ""
#define BTN 19

int mode = 0;
float coord_lon, coord_lat, main_temp, wind_speed;
int main_pressure, main_humidity;
const char * weather_0_main;
const char *sys_country;
const char * name;

LiquidCrystal_I2C lcd1(0x27, 16, 2);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115300);
  Serial.println("Initializing WiFi...");
  WiFi.mode(WIFI_STA);
  Serial.println("Setup done!");
  WiFi.begin(SSID, PASS);

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

  Serial.println();
  Serial.print("WIFI connected. LocalIP :");
  Serial.println(WiFi.localIP());
  Wire.begin();
  lcd1.init();
  lcd1.backlight();

  getWeatherInfo("Hanoi");

  pinMode(BTN, INPUT_PULLUP);
}

void loop() {
  unsigned long now  = millis();
  if (Serial.available()) {
    String location = Serial.readStringUntil('\n');
    getWeatherInfo(location);
  }

  if (digitalRead(BTN) == LOW) {
    delay(50);
    while (digitalRead(BTN) == LOW) {
      if (millis() - now > 1000) {
        now = millis();
        nextMode();
        showInfo();
      }
    }
  }
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}


void getWeatherInfo (String location) {

  // String location = "Hanoi";
  String api_key = "9396f69fee320a0014ac3fa7ab35381d";

  String api = "http://api.openweathermap.org/data/2.5/weather?q=" + location + "&appid=" + api_key;
  String output = "";

  WiFiClient client;
  HTTPClient http;

  if (http.begin(client, api)) {
    int httpCode = http.GET();
    if (httpCode > 0) {
      Serial.print("http code");
      Serial.println(httpCode);

      if (httpCode == HTTP_CODE_OK) {
        output = http.getString();
        Serial.print(output);
        deSerialization(output);
        showInfo();
      }
    } else {
      Serial.println(httpCode);
      Serial.println("Failed");
    }
    http.end();
  } else {
    Serial.println("unable to connect");
  }

}

void showInfoLCD(LiquidCrystal_I2C lcd,  float  input, int col, int row) {
  lcd.setCursor(col, row);
  lcd.print(input);
}
void showInfoLCD(LiquidCrystal_I2C lcd,  int  input, int col, int row) {
  lcd.setCursor(col, row);
  lcd.print(input);
}
void showInfoLCD(LiquidCrystal_I2C lcd,  const char * input, int col, int row) {
  lcd.setCursor(col, row);
  lcd.print(input);
}

void nextMode() {
  mode ++;
  if (mode == 3) mode = 0;
}

void deSerialization(String input) {
  // String input;

  JsonDocument doc;

  DeserializationError error = deserializeJson(doc, input);

  if (error) {
    Serial.print("deserializeJson() failed: ");
    Serial.println(error.c_str());
    return;
  }

  coord_lon = doc["coord"]["lon"]; // 105.8412
  coord_lat = doc["coord"]["lat"]; // 21.0245

  JsonObject weather_0 = doc["weather"][0];
  weather_0_main = weather_0["main"]; // "Clouds"

  JsonObject main = doc["main"];
  main_temp = main["temp"]; // 306.15
  main_pressure = main["pressure"]; // 1005
  main_humidity = main["humidity"]; // 71

  JsonObject wind = doc["wind"];
  wind_speed = wind["speed"]; // 5.56

  JsonObject sys = doc["sys"];
  sys_country = sys["country"]; // "VN"

  name = doc["name"]; // "Hanoi"
}

void showInfo() {
  switch (mode) {
    case 0  :
      lcd1.clear();
      lcd1.print("Country: ");
      showInfoLCD(lcd1, sys_country, 9, 0 );
      lcd1.setCursor(0, 1);
      lcd1.print("City: ");
      showInfoLCD(lcd1, name, 6, 1 );
      break;
    case 1 :
      lcd1.clear();
      lcd1.print("Temp: ");
      showInfoLCD(lcd1, main_temp, 6, 0 );
      lcd1.setCursor(0, 1);
      lcd1.print("Humid: ");
      showInfoLCD(lcd1, main_humidity, 7, 1 );
      break;
    case 2:
      lcd1.clear();
      lcd1.print("Pressure: ");
      showInfoLCD(lcd1, main_pressure, 10, 0 );
      lcd1.setCursor(0, 1);
      lcd1.print("windSpeed: ");
      showInfoLCD(lcd1, wind_speed, 11, 1 );
      break;
  }
}