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#include <WiFi.h>
#include <ESPAsyncWebServer.h>
#include <SPIFFS.h>
#include <Preferences.h>

Preferences preferences; // For saving Wi-Fi credentials

const char *ssid = "ESP32-AP"; // Access point SSID
const char *password = "123456789"; // Access point password (optional)

AsyncWebServer server(80); // Web server on port 80

// HTML code for the Wi-Fi configuration page
const char* htmlForm = R"(
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>ESP32 Wi-Fi Configuration</title>
    <script>
        function submitForm() {
            var ssid = document.getElementById('ssid').value;
            var pass = document.getElementById('password').value;
            fetch('/savewifi', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/x-www-form-urlencoded',
                },
                body: 'ssid=' + ssid + '&password=' + pass
            }).then(response => response.text())
              .then(data => {
                  alert(data);
              });
        }
    </script>
</head>
<body>
    <h1>Wi-Fi Configuration</h1>
    <form onsubmit="event.preventDefault(); submitForm();">
        <label for="ssid">SSID:</label><br>
        <input type="text" id="ssid" name="ssid" required><br><br>
        <label for="password">Password:</label><br>
        <input type="password" id="password" name="password" required><br><br>
        <input type="submit" value="Save Wi-Fi">
    </form>
</body>
</html>
)";

void setup() {
    // Start the serial monitor
    Serial.begin(115200);
    
    // Mount SPIFFS filesystem
    if (!SPIFFS.begin(true)) {
        Serial.println("SPIFFS Mount Failed");
        return;
    }
    
    // Initialize Wi-Fi as Access Point (AP)
    WiFi.softAP(ssid, password);
    Serial.println("Access Point Started");
    Serial.print("IP Address: ");
    Serial.println(WiFi.softAPIP());

    // Handle root path for the Wi-Fi form
    server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
        request->send(200, "text/html", htmlForm);
    });

    // Handle the form POST request to save Wi-Fi credentials
    server.on("/savewifi", HTTP_POST, [](AsyncWebServerRequest *request){
        String ssid = request->arg("ssid");
        String password = request->arg("password");

        // Save Wi-Fi credentials to Preferences
        preferences.begin("wifi", false);
        preferences.putString("ssid", ssid);
        preferences.putString("password", password);
        preferences.end();

        // Provide feedback to the user
        request->send(200, "text/plain", "Wi-Fi credentials saved. Rebooting...");
        
        // Reboot the ESP32 to attempt Wi-Fi connection
        delay(1000);
        ESP.restart();
    });

    // Start the web server
    server.begin();
}

void loop() {
    // Check if Wi-Fi credentials are stored
    preferences.begin("wifi", true);
    String ssid = preferences.getString("ssid", "");
    String password = preferences.getString("password", "");
    preferences.end();

    // If credentials are stored, try to connect to Wi-Fi
    if (ssid != "" && password != "") {
        WiFi.begin(ssid.c_str(), password.c_str());
        Serial.print("Connecting to Wi-Fi");
        while (WiFi.status() != WL_CONNECTED) {
            delay(500);
            Serial.print(".");
        }
        Serial.println("\nConnected to Wi-Fi");
        Serial.print("IP Address: ");
        Serial.println(WiFi.localIP());
    }

    // Add any other functionality here
    delay(1000);
}