// GET /api/devices/screen?mac=XX — Return the image URL for a device's current screen

#include "cJSON.h"
#include "esp_http_server.h"

#include "types.hpp"
#include "device.hpp"

internal esp_err_t api_devices_screen_handler(httpd_req_t *req)
{
  httpd_resp_set_type(req, "application/json");
  httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");

  // Extract mac query parameter
  char mac[18] = {};
  size_t buf_len = httpd_req_get_url_query_len(req) + 1;
  if (buf_len > 1)
  {
    char query[64] = {};
    if (httpd_req_get_url_query_str(req, query, sizeof(query)) == ESP_OK)
    {
      httpd_query_key_value(query, "mac", mac, sizeof(mac));
    }
  }

  if (mac[0] == '\0')
  {
    httpd_resp_send_err(req, HTTPD_400_BAD_REQUEST, "Missing 'mac' query param");
    return ESP_FAIL;
  }

  device_t *dev = find_device(mac);
  if (!dev)
  {
    httpd_resp_send_err(req, HTTPD_404_NOT_FOUND, "Device not registered");
    return ESP_FAIL;
  }

  // Build image_url: /api/devices/screen.png?mac=XX
  char image_url[64];
  snprintf(image_url, sizeof(image_url), "/api/devices/screen.png?mac=%s", mac);

  cJSON *resp = cJSON_CreateObject();
  cJSON_AddStringToObject(resp, "image_url", image_url);

  const char *json = cJSON_PrintUnformatted(resp);
  httpd_resp_sendstr(req, json);

  free((void *)json);
  cJSON_Delete(resp);

  return ESP_OK;
}

internal const httpd_uri_t api_devices_screen_info_uri = {
    .uri = "/api/devices/screen",
    .method = HTTP_GET,
    .handler = api_devices_screen_handler,
    .user_ctx = NULL};