#include "esp_wifi.h"
#include "esp_log.h"

/* 待连接AP的ssid、password，连接失败重试次数   可以通过idf.py menuconfig配置 */
#define ESP_WIFI_SSID CONFIG_ESP_WIFI_SSID
#define ESP_WIFI_PASS CONFIG_ESP_WIFI_PASSWORD
#define ESP_MAXIMUM_RETRY CONFIG_ESP_MAXIMUM_RETRY

static const char *TAG = "wifi station";
static int s_retry_num = 0;

/* 修正：该函数还需要仔细编写，以处理在运行过程中发生的断连等多种事件，增加程序的健壮性 */
static void 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)
    {
        /* disconnected: 重试ESP_MAXIMUM_RETRY次*/
        ESP_LOGI(TAG, "connect to the AP fail");
        if (s_retry_num < ESP_MAXIMUM_RETRY)
        {
            esp_wifi_connect();
            s_retry_num++;
            ESP_LOGI(TAG, "retry to connect to the AP");
        }
        else
        {
            ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s",
                ESP_WIFI_SSID, ESP_WIFI_PASS);
        }
    }
    else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_CONNECTED)
    {
        ESP_LOGI(TAG, "connected to ap SSID:%s password:%s",
                 ESP_WIFI_SSID, ESP_WIFI_PASS);
    }
    else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) 
    {
        /* connected后lwip任务自动启动DHCP服务，分配ip */
        ip_event_got_ip_t *event = (ip_event_got_ip_t *)event_data;
        ESP_LOGI(TAG, "got ip:" IPSTR, IP2STR(&event->ip_info.ip));
        s_retry_num = 0;
    }
}


void wifi_init_sta(void)
{
    ESP_LOGI(TAG, "ESP_WIFI_INIT_STA");

    /* 初始化 */
    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));

    /* 注册WIFI和IP事件 */
    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,
                                                        &event_handler,
                                                        NULL,
                                                        &instance_any_id));
    ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT,
                                                        IP_EVENT_STA_GOT_IP,
                                                        &event_handler,
                                                        NULL,
                                                        &instance_got_ip));

    /* 配置、开启WIFI */
    wifi_config_t wifi_config = {
        .sta = {
            .ssid = ESP_WIFI_SSID,
            .password = ESP_WIFI_PASS,
            .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());
}