// ESP32 HTTPClient + Weather API (wttr.in) + I2C LCD
// LED: GPIO 5 (220 ohm) | LCD: SDA=21 SCL=22 VCC=VIN
// Bilingual TR/EN display
// API: wttr.in (key gerektirmez / no key required)

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

// Wi-Fi credentials — Wokwi default
const char* WIFI_SSID = "Wokwi-GUEST";
const char* WIFI_PASS = "";

// Sehir adi — kendi sehrinizle degistirin / Your city
const char* CITY = "Istanbul";

// API call interval — 30 dakika / 30 minutes
const unsigned long FETCH_INTERVAL_MS = 30UL * 60UL * 1000UL;

#define LED_PIN  5
#define I2C_SDA 21
#define I2C_SCL 22

LiquidCrystal_I2C lcd(0x27, 16, 2);

struct WeatherData {
  String city;
  String tempC;
  String humidity;
  String descEn;
  String descTr;
  String windKmh;
  unsigned long lastFetchMs;
  bool valid;
};
WeatherData weather = {"", "", "", "", "", "", 0, false};

bool wifiOk = false;

// ============================================================
// LCD helpers
// ============================================================
void lcdLine(uint8_t row, const String &text) {
  lcd.setCursor(0, row);
  String t = text;
  while (t.length() < 16) t += " ";
  lcd.print(t.substring(0, 16));
}

void showScreen(const String &tr, const String &en) {
  lcdLine(0, tr);
  lcdLine(1, en);
}

// ============================================================
// Hava durumu EN -> TR cevirisi / Weather EN -> TR mapping
// ============================================================
String translateWeather(const String &en) {
  String e = en;
  e.toLowerCase();
  if (e.indexOf("partly cloudy") >= 0) return "Parcali bulut";
  if (e.indexOf("sunny") >= 0)         return "Gunesli";
  if (e.indexOf("clear") >= 0)         return "Acik";
  if (e.indexOf("overcast") >= 0)      return "Kapali";
  if (e.indexOf("cloudy") >= 0)        return "Bulutlu";
  if (e.indexOf("mist") >= 0)          return "Sisli";
  if (e.indexOf("fog") >= 0)           return "Sis";
  if (e.indexOf("light rain") >= 0)    return "Hafif yagmur";
  if (e.indexOf("heavy rain") >= 0)    return "Siddetli yagmur";
  if (e.indexOf("rain") >= 0)          return "Yagmurlu";
  if (e.indexOf("drizzle") >= 0)       return "Cisenti";
  if (e.indexOf("snow") >= 0)          return "Karli";
  if (e.indexOf("thunder") >= 0)       return "Firtinali";
  if (e.indexOf("hail") >= 0)          return "Doluli";
  return en;
}

// ============================================================
// LED yardimcisi / LED helper
// ============================================================
void blink(uint8_t times, uint16_t onMs = 100, uint16_t offMs = 120) {
  for (uint8_t i = 0; i < times; i++) {
    digitalWrite(LED_PIN, HIGH); delay(onMs);
    digitalWrite(LED_PIN, LOW);  delay(offMs);
  }
}

// ============================================================
// API'den veri cek / Fetch from API
// ============================================================
bool fetchWeather() {
  if (!wifiOk) return false;

  showScreen("API cagriliyor", "Fetching data..");
  digitalWrite(LED_PIN, HIGH);

  HTTPClient http;
  String url = String("http://wttr.in/") + CITY + "?format=j1";
  http.setTimeout(10000);
  http.begin(url);
  http.addHeader("User-Agent", "BlueGrays-ESP32/1.0");

  int code = http.GET();
  bool ok = false;

  if (code == 200) {
    String body = http.getString();
    JsonDocument doc;
    DeserializationError err = deserializeJson(doc, body);
    if (!err) {
      JsonObject cur = doc["current_condition"][0];

      weather.city        = String(CITY);
      weather.tempC       = cur["temp_C"].as<String>();
      weather.humidity    = cur["humidity"].as<String>();
      weather.descEn      = cur["weatherDesc"][0]["value"].as<String>();
      weather.descTr      = translateWeather(weather.descEn);
      weather.windKmh     = cur["windspeedKmph"].as<String>();
      weather.lastFetchMs = millis();
      weather.valid       = true;
      ok = true;
    }
  }
  http.end();

  if (ok) {
    showScreen("Veri alindi!", "Data received!");
    digitalWrite(LED_PIN, HIGH);
    delay(2000);
    digitalWrite(LED_PIN, LOW);
  } else {
    showScreen("HATA: HTTP " + String(code), "Error: HTTP " + String(code));
    digitalWrite(LED_PIN, LOW);
    blink(3, 150, 150);
    delay(1500);
  }
  return ok;
}

// ============================================================
// Veri ekranlarini sirayla goster + LED davranisi
// ============================================================
void showWeatherScreens() {
  if (!weather.valid) {
    showScreen("Veri yok", "No data yet");
    delay(2500);
    return;
  }

  // Sehir / City — 1 kirpis
  showScreen("Sehir: " + weather.city, "City: " + weather.city);
  blink(1);
  delay(2780);

  // Sicaklik / Temperature — 2 kirpis
  showScreen("Sicaklik: " + weather.tempC + " C", "Temp: " + weather.tempC + " C");
  blink(2);
  delay(2560);

  // Nem / Humidity — 3 kirpis
  showScreen("Nem: %" + weather.humidity, "Humidity: " + weather.humidity + "%");
  blink(3);
  delay(2340);

  // Hava / Weather — uzun 1sn yanik
  showScreen("Hava: " + weather.descTr, "Weather: " + weather.descEn);
  digitalWrite(LED_PIN, HIGH);
  delay(1000);
  digitalWrite(LED_PIN, LOW);
  delay(2000);

  // Ruzgar / Wind — 4 hizli kirpis
  showScreen("Ruzgar: " + weather.windKmh + "km/h", "Wind: " + weather.windKmh + " km/h");
  blink(4, 80, 100);
  delay(2280);

  // Son guncelleme / Last update — yavas heartbeat
  unsigned long elapsedSec = (millis() - weather.lastFetchMs) / 1000;
  unsigned long elapsedMin = elapsedSec / 60;
  String trAge = elapsedMin > 0 ? String(elapsedMin) + " dk once" : String(elapsedSec) + " sn once";
  String enAge = elapsedMin > 0 ? String(elapsedMin) + " min ago" : String(elapsedSec) + " sec ago";
  showScreen("Guncel: " + trAge, "Updated: " + enAge);
  blink(1, 60, 940);
  blink(1, 60, 940);
}

// ============================================================
// SETUP
// ============================================================
void setup() {
  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, LOW);

  // LCD ilk basta / Init LCD first
  Wire.begin(I2C_SDA, I2C_SCL);
  lcd.init();
  lcd.backlight();

  // Splash 3sn
  showScreen("  BlueGrays", "  Weather v1.0");
  delay(3000);

  // WiFi — 20sn timeout
  showScreen("WiFi baglaniyor", "Connecting WiFi");
  WiFi.mode(WIFI_STA);
  WiFi.begin(WIFI_SSID, WIFI_PASS);

  unsigned long startWifi = millis();
  while (WiFi.status() != WL_CONNECTED && millis() - startWifi < 20000) {
    delay(400);
  }

  if (WiFi.status() == WL_CONNECTED) {
    wifiOk = true;
    showScreen("WiFi baglandi", "WiFi connected");
    delay(2000);
    showScreen("IP adresi:", WiFi.localIP().toString());
    delay(2000);

    // Ilk API cagrisi / First API call
    fetchWeather();
  } else {
    showScreen("WiFi baglanmadi", "WiFi failed");
    delay(2000);
    showScreen("Offline modu", "Offline mode");
    delay(2500);
  }
}

// ============================================================
// LOOP
// ============================================================
void loop() {
  // 30 dakikada bir API tekrar cagir
  if (wifiOk && millis() - weather.lastFetchMs > FETCH_INTERVAL_MS) {
    fetchWeather();
  }

  // Veri ekranlarini sirayla goster (LED davranisi ile birlikte)
  showWeatherScreens();
}