#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
#include <LiquidCrystal_I2C.h>
#include <TimeLib.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* url = "https://api-arrivals.sofiatraffic.bg/api/v1/arrivals/0124/?line=67&type=bus";
const int interval = 30*1000;

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup(){
  lcd.init();
  lcd.backlight();
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  lcd.home();
  lcd.print("Connecting...");
  while(WiFi.status() != WL_CONNECTED){
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());
  lcd.clear();
  lcd.print("Connected");
}

void loop(){
  if (WiFi.status()== WL_CONNECTED){
    String response = httpGETRequest(url);
    Serial.println(response);
    
    const size_t capacity = JSON_ARRAY_SIZE(1) + JSON_ARRAY_SIZE(8) + 9*JSON_OBJECT_SIZE(4) + JSON_OBJECT_SIZE(5) + 780;
    DynamicJsonDocument doc(capacity);
    //const char* json = response.c_str();
    const char* json = "{'license': '','timestamp_calculated': '2020-11-24 23:25:01','lines': [{'arrivals': [{'time': '23:41:36','has_wifi': null,'has_air_conditioning': true,'is_wheelchair_accessible': true}],'vehicle_type': 'bus','direction': null,'name': '67'}],'code': '0124','name': ''}";
    deserializeJson(doc, json);

    const char* dateTimeCalc = doc["timestamp_calculated"];
    Serial.println(dateTimeCalc);

    unsigned long timeCalc = makeTime(setTimeElements(dateTimeCalc));
    
    JsonArray arrivals = doc["lines"][0]["arrivals"];

    const char* timeArrStr_1 = arrivals[0]["time"];
    Serial.println(timeArrStr_1);

    char* dateTimeArrStr_1 = setDateTimeArr(dateTimeCalc, timeArrStr_1);
    
    unsigned long timeArr_1 = makeTime(setTimeElements(dateTimeArrStr_1));
    int timeTo_1 = (timeArr_1 - timeCalc) / 60;
    Serial.println(timeTo_1);
    
    lcd.clear();
    lcd.setCursor(1, 0);
    lcd.print(timeTo_1);
/*
    const char* time2 = arrivals[1]["time"];
    char sub2[6];
    strncpy(sub2, time2, 5);
    sub2[5] = '\0';
    Serial.println(sub2);
    lcd.setCursor(9, 0);
    lcd.print(sub2);

    
    const char* time3 = arrivals[2]["time"];
    char sub3[6];
    strncpy(sub3, time3, 5);
    sub3[5] = '\0';
    Serial.println(sub3);
    lcd.setCursor(1, 1);
    lcd.print(sub3);

    const char* time4 = arrivals[3]["time"];
    char sub4[6];
    strncpy(sub4, time4, 5);
    sub4[5] = '\0';
    Serial.println(sub4);
    lcd.setCursor(9, 1);
    lcd.print(sub4);
    */
  } else {
    Serial.println("WiFi Disconnected");
    lcd.clear();
    lcd.print("Disconnected");
  }
  delay(interval);
}

String httpGETRequest(const char* url){
  HTTPClient http;
  http.begin(url);
  String payload = "{}"; 
  int responseCode = http.GET();
  if (responseCode > 0){
    payload = http.getString();
  } else {
    Serial.print("Error code: ");
    Serial.println(responseCode);
    lcd.clear();
    lcd.print("Error: ");
    lcd.print(responseCode);
  }
  http.end();
  return payload;
}

tmElements_t setTimeElements(const char* str){
  tmElements_t tm;
  int Year, Month, Day, Hour, Minute, Second;
  sscanf(str, "%d-%d-%d %d:%d:%d", &Year, &Month, &Day, &Hour, &Minute, &Second);
  tm.Year = CalendarYrToTm(Year);
  tm.Month = Month;
  tm.Day = Day;
  tm.Hour = Hour;
  tm.Minute = Minute;
  tm.Second = Second;
  return tm;
}

char* setDateTimeArr(const char* dateTimeCalc, const char* timeArrStr){
  char str[20];
  strncpy(str, dateTimeCalc, 11);
  str[11] = '\0';
  strncat(str, timeArrStr, 8);
  Serial.println(str);
  return str;
}