#include <stdint.h>
#include <stdio.h>

#include "sdkconfig.h"

/* FreeRTOS */
#include "freertos/FreeRTOS.h"
#include "freertos/event_groups.h"
#include "freertos/task.h"

/* IDF */
#include "esp_event.h"
#include "esp_log.h"
#include "esp_system.h"
#include "esp_wifi.h"

/* LwIP */
#include "lwip/err.h"
#include "lwip/sys.h"

static const char *LOG_TAG = "APP_WIFI";

#define WIFI_SSID CONFIG_APP_WIFI_SSID
#define WIFI_PSK  CONFIG_APP_WIFI_PASS
#define WIFI_RETR CONFIG_APP_WIFI_RETR

#define WIFI_CONNECTED_BIT BIT0
#define WIFI_FAIL_BIT      BIT1

static uint8_t s_retry_num = 0;

static EventGroupHandle_t s_wifi_event_group;

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) {
        xEventGroupClearBits(s_wifi_event_group, WIFI_CONNECTED_BIT);

#if WIFI_RETR != 0
        if (s_retry_num < WIFI_RETR) {
            esp_wifi_connect();
            s_retry_num++;
            ESP_LOGI(LOG_TAG, "connection lost, reconnecting...");
        } else {
            xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
            ESP_LOGE(LOG_TAG, "connection failed, no more retries scheduled.");
        }
#else
        esp_wifi_connect();
        ESP_LOGI(LOG_TAG, "connection lost, reconnecting...");
#endif
    }

    else if (event_base == IP_EVENT) {
        if (event_id == IP_EVENT_STA_GOT_IP) {
            xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);

            ip_event_got_ip_t *event = event_data;
            ESP_LOGI(LOG_TAG, "got IPv4 address: " IPSTR, IP2STR(&event->ip_info.ip));
            s_retry_num = 0;
        }

        if (event_id == IP_EVENT_GOT_IP6) {
            xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);

            ip_event_got_ip6_t *event = event_data;
            ESP_LOGI(LOG_TAG, "got IPv6 address: " IPV6STR, IPV62STR(event->ip6_info.ip));
            s_retry_num = 0;
        }
    }
}

void app_wifi_init(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));
    ESP_ERROR_CHECK(
        esp_event_handler_instance_register(IP_EVENT, IP_EVENT_GOT_IP6, &_wifi_event_handler, NULL, &instance_got_ip));

    wifi_config_t wifi_config = {
        .sta =
            {
                .ssid               = WIFI_SSID,
                .password           = WIFI_PSK,
                .threshold.authmode = WIFI_AUTH_WPA2_PSK,
                .pmf_cfg            = {.capable = true, .required = false},
            },
    };

    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());
}

void app_wifi_wait_connected(uint32_t timeout_ticks) {
}