#include <WiFi.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <SD.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>

#define CS_PIN 5
int lcdRows=2;int lcdCols=16;

#define TFT_DC 2
#define TFT_CS 5
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

#define CS_PIN 5
LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, lcdCols, lcdRows);
File root;

String ssid="";
String password="";

void setup() {
  Serial.begin(115200);
  Serial.println("! ESP32 ! online");
  LCD.init();
  LCD.backlight();
  initalize();
  sdcard_scan();
  wifi_scan();
  wifi_connect("Wokwi-GUEST", "");
  tft.begin();
  }

void loop() {
  delay(10);
}

void initalize(){
  LCD.setCursor(3, 0);
  LCD.print("LCD online");
  delay(500);
  LCD.clear();
  LCD.print("Initializing");
  LCD.setCursor(0,1);
  for (int i=0; i<5; i++){
    delay(200);
    LCD.print('.');
  }
  LCD.clear();
  LCD.setCursor(3,0);
  LCD.print("..ONLINE..");
  delay(500);
  LCD.clear();
  
  // tft.setRotation(1);
  // tft.setTextColor(ILI9341_WHITE);
  // tft.setTextSize(2);
  // tft.print("Connecting to WiFi");
}

void sdcard_scan(){
  Serial.print("Initializing SD card... ");
  if (!SD.begin(CS_PIN)) {
    Serial.println("Card initialization failed!");
    while (true);
  }
  Serial.println("initialization done.");
  Serial.println("Files in the card:");
  root = SD.open("/");
  printDirectory(root, 0);
  Serial.println("");
  File textFile = SD.open("/wifi-key.txt");
  if (textFile) {
    Serial.print("wifi-key.txt: ");
    while (textFile.available()) {
      char wifi_key=textFile.read();
      Serial.write(wifi_key);
      }
    textFile.close();
  } else {
    Serial.println("error opening wifi-key.txt!");
  }
}

void printDirectory(File dir, int numTabs) {
  while (true) {
    File entry =  dir.openNextFile();
    if (! entry) {
      break;
    }
    for (uint8_t i = 0; i < numTabs; i++) {
      Serial.print('\t');
    }
    Serial.print(entry.name());
    if (entry.isDirectory()) {
      Serial.println("/");
      printDirectory(entry, numTabs + 1);
    } else {
      Serial.print("\t\t");
      Serial.println(entry.size(), DEC);
    }
    entry.close();
  }
}

void wifi_scan(){
  LCD.setCursor(2,0);
  LCD.print("! WIFI MOD !");
  LCD.setCursor(4,1);
  LCD.print("Scanning");
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(100);
  LCD.clear();
  int n = WiFi.scanNetworks();
  Serial.println("scan done");
  LCD.setCursor(0,1);
  LCD.print("Scan Done.");
  delay(500);
  LCD.clear();
  if (n == 0) {
  LCD.setCursor(3,1);
    LCD.print("no networks");
      Serial.println("no networks found");
  } else {
    Serial.print(n);
  LCD.setCursor(2,1);
    LCD.print(n);
  LCD.setCursor(4,1);
    LCD.print("wifi found");
    Serial.println(" networks found");
    for (int j = 0; j < n; ++j) {
      Serial.print(j + 1);
      Serial.print(": ");
      Serial.print(WiFi.SSID(j));
      Serial.print(" (");
      Serial.print(WiFi.RSSI(j));
      Serial.print(")");
      Serial.println((WiFi.encryptionType(j) == WIFI_AUTH_OPEN)?" ":"*");
      delay(10);
    }delay(200);
  }
  Serial.println("");
  delay(5000);
}

void wifi_connect(String wifi_ssid,String wifi_pswd){
  WiFi.begin(wifi_ssid, wifi_pswd);
  LCD.clear();
  LCD.setCursor(0,0);
  LCD.print("Connected to");
  delay(500);
  Serial.print("Connecting to WiFi ..");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print('.');
    delay(1000);
  }
  LCD.clear();
  LCD.setCursor(0,0);
  delay(500);
  LCD.print(wifi_ssid);
  LCD.setCursor(0,0);
  LCD.print(wifi_ssid);
  LCD.setCursor(0,1);
  LCD.print("[IP] ");
  LCD.setCursor(5,1);
  LCD.print(WiFi.localIP());
  delay(1000);
  LCD.clear();
}