#include <WiFi.h>
#include <WebServer.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>

// === WiFi Ayarları ===
const char* ssid = "SSID_ADI";
const char* password = "WIFI_SIFRE";

// === LCD Ayarları ===
#define I2C_ADDR 0x27
#define LCD_COLUMNS 20
#define LCD_ROWS 4
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_ROWS);

// === Keypad Ayarları ===
const byte ROWS = 5;
const byte COLS = 6;
byte rowPins[ROWS] = {23,19,18,17,16};
byte colPins[COLS] = {32,33,25,26,27,4};

char keys[ROWS][COLS] = {
  {'J', '+','1', '2', '3', 'A' },
  {'K', '-','4', '5', '6', 'B' },
  {'L', '/','7', '8', '9', 'C' },
  {'Z', '=','.', '0', 'M', 'D' },
  {'V', 'W','Q', 'S', 'E', 'R' }
};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// === HTTP Server ===
WebServer server(80);

// === Liste ===
const int MAX_ROWS = 50;
String dataList[MAX_ROWS];   
int totalRows = 0;        
int currentIndex = 0;     


// === Satır Gösterme ===
void showRows() {
  lcd.clear();
  for (int i = 0; i < 4; i++) {
    int idx = currentIndex + i;
    if (idx < totalRows) {
      lcd.setCursor(2, i);
      lcd.print(dataList[idx]);
      Serial.printf("Satir %d: %s\n", idx+1, dataList[idx].c_str());
    }
  }
}

// === Satır Silme ===
void deleteRow(int btnIndex) {
  int idx = currentIndex + btnIndex;
  if (idx < totalRows) {
    Serial.printf("Buton %d basildi, silinen: %s\n", btnIndex+1, dataList[idx].c_str());

    // satırı sil
    for (int i = idx; i < totalRows - 1; i++) {
      dataList[i] = dataList[i + 1];
    }
    totalRows--;

    // currentIndex ayarı
    if (currentIndex > totalRows - 4) currentIndex = max(0, totalRows - 4);

    showRows();
  }
}

// === HTTP POST Liste Alma ===
void handlePostData() {
  if (server.hasArg("plain")) {
    String body = server.arg("plain");
    totalRows = 0;
    int start = 0;

    while (start < body.length() && totalRows < MAX_ROWS) {
      int end = body.indexOf('\n', start);
      if (end == -1) end = body.length();
      dataList[totalRows] = body.substring(start, end);
      dataList[totalRows].trim(); // boşluk/CR temizle
      totalRows++;
      start = end + 1;
    }

    server.send(200, "text/plain", "Liste alindi. Satir sayisi: " + String(totalRows));
    Serial.printf("Liste alindi! Toplam %d satir yuklendi.\n", totalRows);
    showRows();
  } else {
    server.send(400, "text/plain", "Gecersiz veri");
  }
}

// === Setup ===
void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.print("WiFi Baglaniyor");

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("\nWiFi baglandi. IP: " + WiFi.localIP().toString());
  lcd.clear();
  lcd.print("IP: ");
  lcd.print(WiFi.localIP());
 Serial.print(WiFi.localIP());
  // HTTP endpoint
  server.on("/liste", HTTP_POST, handlePostData);
  server.begin();
  Serial.println("HTTP Server basladi.");
}

// === Loop ===
void loop() {
  server.handleClient();

  char key = keypad.getKey();
  if (key) {
    if (key == '1') deleteRow(0);
    if (key == '2') deleteRow(1);
    if (key == '3') deleteRow(2);
    if (key == '4') deleteRow(3);
  }
}