#include "esp_event.h"
#include "esp_log.h"
#include "esp_wifi.h"
#include "freertos/event_groups.h"
#include "freertos/task.h"
#include "secrets.h"

// `TAG` is common naming convention for logs in ESP-IDF
static const char *TAG = "wifi"; // Logs are coming from this wifi module. TAG =
// common naming convention for logs in ESP-IDF
static EventGroupHandle_t s_wifi_event_group;
static int s_retry_num = 0;

#define WIFI_CONNECTED_BIT BIT0
#define WIFI_FAIL_BIT BIT1
#define MAX_RETRY 5

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_STA_START) {
    esp_wifi_connect();
  } else if (event_base == WIFI_EVENT &&
             event_id == WIFI_EVENT_STA_DISCONNECTED) {
    if (s_retry_num < MAX_RETRY) {
      esp_wifi_connect();
      s_retry_num++;
      ESP_LOGI(TAG, "Retrying connection...");
    } else {
      xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
    }
  } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
    ESP_LOGI(TAG, "Connected! Got IP");
    s_retry_num = 0;
    xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
  }
}

void wifi_connect(void) {
  s_wifi_event_group = xEventGroupCreate();
  ESP_ERROR_CHECK(esp_netif_init());
  ESP_ERROR_CHECK(esp_event_loop_create_default());
  esp_netif_create_default_wifi_sta();

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

  esp_event_handler_instance_t instance_any_id;
  esp_event_handler_instance_t instance_got_ip;
  ESP_ERROR_CHECK(esp_event_handler_instance_register(
      WIFI_EVENT, ESP_EVENT_ANY_ID, &wifi_event_handler, NULL,
      &instance_any_id));
  ESP_ERROR_CHECK(esp_event_handler_instance_register(
      IP_EVENT, IP_EVENT_STA_GOT_IP, &wifi_event_handler, NULL,
      &instance_got_ip));

  wifi_config_t wifi_config = {
      .sta =
          {
              .ssid = SECRETS_WIFI_SSID,
              .password = SECRETS_WIFI_PASS,
          },
  };
  ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
  ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
  ESP_ERROR_CHECK(esp_wifi_start());

  // Wait for connection
  EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group,
                                         WIFI_CONNECTED_BIT | WIFI_FAIL_BIT,
                                         pdFALSE, pdFALSE, portMAX_DELAY);

  if (bits & WIFI_CONNECTED_BIT) {
    ESP_LOGI(TAG, "WiFi connected successfully");
  } else {
    ESP_LOGE(TAG, "WiFi connection failed");
  }
}