#include <ArduinoJson.h>

#include <TinyGPS++.h>
#include <wiring_private.h>
#include "TFT_eSPI.h"
#include <Arduino.h>
#include <rpcWiFi.h>
#include <HTTPClient.h>


TFT_eSPI tft;

static const uint32_t GPSBaud = 115200;

// The TinyGPS++ object
TinyGPSPlus gps;

// The serial connection to the GPS device - Left side Grove connector.
// Left side Grove connector shares pins with I2C1 of 40 pin connector.
static Uart Serial3(&sercom3, PIN_WIRE_SCL, PIN_WIRE_SDA, SERCOM_RX_PAD_1, UART_TX_PAD_0);

String last_date = "";
String last_time = "";
String last_lat = "";
String last_lon = "";

char* ssid = "SSID";
char* pw = "PASSWORD";

void setup()
{
  Serial.begin(115200);
  tft.begin();
  tft.setRotation(3);
  tft.fillScreen(TFT_BLACK);
  tft.setFreeFont(&FreeSans9pt7b);
  tft.setTextColor(TFT_WHITE);

  Serial3.begin(GPSBaud);
  pinPeripheral(PIN_WIRE_SCL, PIO_SERCOM_ALT);
  pinPeripheral(PIN_WIRE_SCL, PIO_SERCOM_ALT);

  tft.drawString("Not using WiFi", 10, 10);
  WiFi.begin(ssid, pw);
}
 
void loop()
{
  while (Serial3.available() > 0)
  {
    if (gps.encode(Serial3.read()))
    {
      displayInfo();
    }
  }

  delay(1000);
}

void displayInfo()
{
  if (gps.date.isValid())
  {
    String text = String(gps.date.day()) + "/" + String(gps.date.month()) + "/" + String(gps.date.year());
    if(text != last_date)
    {
      tft.fillRect(10, 210, 80, 15, TFT_BLACK);
      tft.drawString(text, 10, 210);
      last_date = text;
    }
  }

  if (gps.time.isValid())
  {
    String h = "";
    String m = "";
    if(gps.time.hour() < 10) h = "0";
    h = h + String(gps.time.hour());
    if(gps.time.minute() < 10) m = "0";
    m = m + String(gps.time.minute());

    String text = h + ":" + m;
    if(text != last_time)
    {
      tft.fillRect(250, 210, 50, 15, TFT_BLACK);
      tft.drawString(text, 250, 210);
      last_time = text;
    }
  }
  
  if (gps.location.isValid())
  {
    String lt = String(gps.location.lat(), 3);
    String ln = String(gps.location.lng(), 3);
    if(lt != last_lat || ln != last_lon)
    {
      String text = lt + ", " + ln;
      tft.fillRect(10, 60, 190, 15, TFT_BLACK);
      tft.drawString(text, 10, 60);

      last_lat = lt;
      last_lon = ln;

      if((WiFi.status() == WL_CONNECTED))
      {
        String wifi_text = "Connected to WiFi: " + String(ssid);
        tft.fillRect(10, 10, 250, 20, TFT_BLACK);
        tft.drawString(wifi_text, 10, 10);
        api_lookup();
      }
    }
  }
}

void api_lookup()
{
  HTTPClient http;
  String api_key = "API KEY";
  String url = "http://api.openweathermap.org/geo/1.0/reverse?lat=" + last_lat + "&lon=" + last_lon + "&limit=1&appid=" + api_key;
  http.begin(url);
  
  int http_code = http.GET();
  if(http_code > 0)
  {
    if(http_code == HTTP_CODE_OK)
    {
      String payload = http.getString();
      payload.remove(0, 1);
      payload.remove(payload.length(), 1);
      Serial.println(payload);

      JsonDocument doc;
      deserializeJson(doc, payload);
      String name = doc["name"];
      String state = doc["state"];
      String loc_text = name + ", " + state;
      tft.fillRect(10, 80, 200, 20, TFT_BLACK);
      tft.drawString(loc_text, 10, 80);
    }
  }

  http.end();
}

void SERCOM3_0_Handler()
{
  Serial3.IrqHandler();
}
void SERCOM3_1_Handler()
{
  Serial3.IrqHandler();
}
void SERCOM3_2_Handler()
{
  Serial3.IrqHandler();
}
void SERCOM3_3_Handler()
{
  Serial3.IrqHandler();
}