#include <esp_wifi.h>
#include <esp_event.h>
#include <esp_log.h>
#include <esp_system.h>
#include <nvs_flash.h>
#include <sys/param.h>
#include "esp_netif.h"
#include "esp_eth.h"
#include "protocol_examples_common.h"

#include <esp_https_server.h>
#include "bme280.h"

static const char *TAG = "BME280";

/* An HTTP GET handler */
static esp_err_t root_get_handler(httpd_req_t *req);
static httpd_handle_t start_webserver(void);
static void stop_webserver(httpd_handle_t server);
static void disconnect_handler(void* arg, esp_event_base_t event_base, 
                               int32_t event_id, void* event_data);
static void connect_handler(void* arg, esp_event_base_t event_base, 
                            int32_t event_id, void* event_data);

static const httpd_uri_t root = {
    .uri       = "/",
    .method    = HTTP_GET,
    .handler   = root_get_handler
};



void my_i2c_setup(void);
void my_bme280_init(void);
extern struct bme280_dev bme280; // from bme280_sup.c

void app_main(void)
{
    static httpd_handle_t server = NULL;

    ESP_ERROR_CHECK(nvs_flash_init());
    ESP_ERROR_CHECK(esp_netif_init());
    ESP_ERROR_CHECK(esp_event_loop_create_default());

    /* Register event handlers to start server when Wi-Fi or Ethernet is connected,
     * and stop server when disconnection happens.
     */

#ifdef CONFIG_EXAMPLE_CONNECT_WIFI
    ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &connect_handler, &server));
    ESP_ERROR_CHECK(esp_event_handler_register(WIFI_EVENT, WIFI_EVENT_STA_DISCONNECTED, &disconnect_handler, &server));
#endif // CONFIG_EXAMPLE_CONNECT_WIFI
#ifdef CONFIG_EXAMPLE_CONNECT_ETHERNET
    ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_ETH_GOT_IP, &connect_handler, &server));
    ESP_ERROR_CHECK(esp_event_handler_register(ETH_EVENT, ETHERNET_EVENT_DISCONNECTED, &disconnect_handler, &server));
#endif // CONFIG_EXAMPLE_CONNECT_ETHERNET

    /* This helper function configures Wi-Fi or Ethernet, as selected in menuconfig.
     * Read "Establishing Wi-Fi or Ethernet Connection" section in
     * examples/protocols/README.md for more information about this function.
     */
    ESP_ERROR_CHECK(example_connect());

    my_i2c_setup();
    my_bme280_init();

}

static esp_err_t root_get_handler(httpd_req_t *req)
{
    httpd_resp_set_type(req, "text/html");
    httpd_resp_send(req, "<h1>Hello Secure World!</h1>", -1); // -1 = use strlen()

    return ESP_OK;
}
static httpd_handle_t start_webserver(void)
{
    httpd_handle_t server = NULL;

    // Start the httpd server
    ESP_LOGI(TAG, "Starting server");

    httpd_ssl_config_t conf = HTTPD_SSL_CONFIG_DEFAULT();

    extern const unsigned char cacert_pem_start[] asm("_binary_cacert_pem_start");
    extern const unsigned char cacert_pem_end[]   asm("_binary_cacert_pem_end");
    conf.cacert_pem = cacert_pem_start;
    conf.cacert_len = cacert_pem_end - cacert_pem_start;

    extern const unsigned char prvtkey_pem_start[] asm("_binary_prvtkey_pem_start");
    extern const unsigned char prvtkey_pem_end[]   asm("_binary_prvtkey_pem_end");
    conf.prvtkey_pem = prvtkey_pem_start;
    conf.prvtkey_len = prvtkey_pem_end - prvtkey_pem_start;

    esp_err_t ret = httpd_ssl_start(&server, &conf);
    if (ESP_OK != ret) {
        ESP_LOGI(TAG, "Error starting server!");
        return NULL;
    }

    // Set URI handlers
    ESP_LOGI(TAG, "Registering URI handlers");
    httpd_register_uri_handler(server, &root);
    return server;
}

static void stop_webserver(httpd_handle_t server)
{
    // Stop the httpd server
    httpd_ssl_stop(server);
}

static void disconnect_handler(void* arg, esp_event_base_t event_base, 
                               int32_t event_id, void* event_data)
{
    httpd_handle_t* server = (httpd_handle_t*) arg;
    if (*server) {
        stop_webserver(*server);
        *server = NULL;
    }
}

static void connect_handler(void* arg, esp_event_base_t event_base, 
                            int32_t event_id, void* event_data)
{
    httpd_handle_t* server = (httpd_handle_t*) arg;
    if (*server == NULL) {
        *server = start_webserver();
    }
}