#include <LiquidCrystal_I2C.h>
#include "WiFi.h"

#include "button.h"

#define pin_btn 12

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 20, 4);
Button btn_button(pin_btn); 

int8_t networks_num = 0;
int8_t network_ptr = 0;

void setup()  
{
  Serial.begin(115200);
  LCD.init();
  LCD.backlight();
  LCD.setCursor(0, 0);
  LCD.print("Scan networks...");

  networks_num = WiFi.scanNetworks();
  LCD.clear();
  LCD.setCursor(0, 0);
  if (networks_num == 0) 
  {
    LCD.print("No networks found");
  }
  else if (networks_num == 1) 
  {
    LCD.print(networks_num);
    LCD.print(" network found");
  }
  else
  {
    LCD.print(networks_num);
    LCD.print(" networks found");
  }
  
}
void loop() 
{  
  check_button();
} 

void check_button()
{
if (btn_button.readButton())
  {
    if (networks_num == 0)
    {
      return;
    }
    LCD.clear();
    LCD.setCursor(0, 0);
    LCD.print(WiFi.SSID(network_ptr));
    Serial.print(WiFi.SSID(network_ptr));
    
    Serial.print(" ");
    LCD.setCursor(0, 1);
    LCD.print(WiFi.RSSI(network_ptr));
    Serial.println(WiFi.RSSI(network_ptr));    

    ++network_ptr;
    if (network_ptr >= networks_num)
    {
      network_ptr = 0;
    }

  }  

}