#include "wifi.h"

#include "sdkconfig.h"
#include <esp_event.h>
#include <esp_log.h>
#include <esp_netif.h>
#include <esp_wifi.h>
#include <freertos/FreeRTOS.h>
#include <freertos/event_groups.h>
#include <freertos/task.h>
#include <string.h>

static const char *TAG = "wifi";

static EventGroupHandle_t s_wifi_event_group;
static const int WIFI_CONNECTED_BIT = BIT0;
static volatile bool s_connected = false;

/* -------------------------------------------------------------------------
 * Event handler
 * ---------------------------------------------------------------------- */
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();
        ESP_LOGI(TAG, "WiFi connecting...");
    } else if (event_base == WIFI_EVENT &&
               event_id == WIFI_EVENT_STA_DISCONNECTED) {
        s_connected = false;
        xEventGroupClearBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
        esp_wifi_connect();
        ESP_LOGI(TAG, "WiFi disconnected, reconnecting...");
    } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
        ip_event_got_ip_t *event = (ip_event_got_ip_t *)event_data;
        ESP_LOGI(TAG, "WiFi connected, IP: " IPSTR, IP2STR(&event->ip_info.ip));
        s_connected = true;
        xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
    }
}

/* -------------------------------------------------------------------------
 * Public API
 * ---------------------------------------------------------------------- */
void wifi_init(void)
{
    s_wifi_event_group = xEventGroupCreate();

    ESP_ERROR_CHECK(esp_netif_init());
    ESP_ERROR_CHECK(esp_event_loop_create_default());
    esp_netif_t *sta_netif = esp_netif_create_default_wifi_sta();
    configASSERT(sta_netif);

    ESP_ERROR_CHECK(esp_netif_set_hostname(sta_netif, "keypitecc"));

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

    ESP_ERROR_CHECK(esp_event_handler_register(WIFI_EVENT, ESP_EVENT_ANY_ID,
                                               &wifi_event_handler, NULL));
    ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP,
                                               &wifi_event_handler, NULL));

    wifi_config_t wifi_config = {};
    strncpy((char *)wifi_config.sta.ssid, CONFIG_WIFI_SSID,
            sizeof(wifi_config.sta.ssid) - 1);
    strncpy((char *)wifi_config.sta.password, CONFIG_WIFI_PASSWORD,
            sizeof(wifi_config.sta.password) - 1);
    wifi_config.sta.threshold.authmode = WIFI_AUTH_WPA2_PSK;

    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());

    ESP_LOGI(TAG, "Connecting to SSID: %s", CONFIG_WIFI_SSID);
}

bool wifi_is_connected(void)
{
    return s_connected;
}