#include <stdio.h>
#include "esp_wifi.h"
#include "nvs_flash.h"
#include "esp_netif.h"
#include <string.h>

#define WIFI_SSID "ESP32-Access-Point"
#define WIFI_PASS "123456789"
#define MAX_STA_CONN 4

// Event handler to log connected clients
static void wifi_event_handler(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data) {
    if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_AP_STACONNECTED) {
        wifi_event_ap_staconnected_t* event = (wifi_event_ap_staconnected_t*) event_data;
        // Print the MAC address manually
        printf("Client connected: MAC %02x:%02x:%02x:%02x:%02x:%02x\n", 
               event->mac[0], event->mac[1], event->mac[2],
               event->mac[3], event->mac[4], event->mac[5]);
    } 
    else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_AP_STADISCONNECTED) {
        wifi_event_ap_stadisconnected_t* event = (wifi_event_ap_stadisconnected_t*) event_data;
        // Print the MAC address manually
        printf("Client disconnected: MAC %02x:%02x:%02x:%02x:%02x:%02x\n", 
               event->mac[0], event->mac[1], event->mac[2],
               event->mac[3], event->mac[4], event->mac[5]);
    }
}

void app_main(void) {
    // Initialize NVS
    esp_err_t ret = nvs_flash_init();
    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
        ESP_ERROR_CHECK(nvs_flash_erase());
        ret = nvs_flash_init();
    }
    ESP_ERROR_CHECK(ret);

    // Initialize network interface
    ESP_ERROR_CHECK(esp_netif_init());
    ESP_ERROR_CHECK(esp_event_loop_create_default());

    // Create default Wi-Fi AP network interface
    esp_netif_t *netif = esp_netif_create_default_wifi_ap();
    if (netif == NULL) {
        // Print error message manually
        printf("Failed to create Wi-Fi AP netif\n");
        return;
    }

    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
    ESP_ERROR_CHECK(esp_wifi_init(&cfg));

    // Register event handler
    ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &wifi_event_handler, NULL, NULL));

    // Configure Wi-Fi as SoftAP
    wifi_config_t wifi_config = {
        .ap = {
            .ssid = WIFI_SSID,
            .ssid_len = strlen(WIFI_SSID),
            .password = WIFI_PASS,
            .max_connection = MAX_STA_CONN,
            .authmode = WIFI_AUTH_WPA_WPA2_PSK,
        },
    };

    if (strlen(WIFI_PASS) == 0) {
        wifi_config.ap.authmode = WIFI_AUTH_OPEN;
    }

    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_AP));
    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_AP, &wifi_config));
    ESP_ERROR_CHECK(esp_wifi_start());

    // Print IP Address of Soft AP
    esp_netif_ip_info_t ip_info;
    ESP_ERROR_CHECK(esp_netif_get_ip_info(netif, &ip_info));
    // Print IP address manually
    printf("Soft AP started! IP: " IPSTR "\n", IP2STR(&ip_info.ip));
}