#include <cstddef>

// SDK
#include "cJSON.h"
#include "esp_http_server.h"
#include "esp_littlefs.h"
#include "esp_partition.h"

// Project
#include "appstate.hpp"
#include "types.hpp"
#include "utils.hpp"

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

  cJSON *root = cJSON_CreateObject();

  cJSON_AddNumberToObject(root, "active_slot", g_Active_WWW_Partition);

  constexpr const char *kPartitions[] = {"www_0", "www_1", "ota_0", "ota_1",
                                         "factory"};
  constexpr size_t kPartitionCount = ArrayCount(kPartitions);
  cJSON *parts_arr = cJSON_AddArrayToObject(root, "partitions");

  for (size_t i = 0; i < kPartitionCount; i++)
  {
    cJSON *p_obj = cJSON_CreateObject();
    cJSON_AddStringToObject(p_obj, "label", kPartitions[i]);

    const esp_partition_t *p = esp_partition_find_first(
        ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_ANY, kPartitions[i]);
    if (p)
    {
      cJSON_AddNumberToObject(p_obj, "size", p->size);

      size_t total = 0, used = 0;
      if (esp_littlefs_info(kPartitions[i], &total, &used) == ESP_OK)
      {
        cJSON_AddNumberToObject(p_obj, "used", used);
        cJSON_AddNumberToObject(p_obj, "free", total - used);
      }
      else
      {
        // Not mounted or not LFS
        cJSON_AddNumberToObject(p_obj, "used", 0);
        cJSON_AddNumberToObject(p_obj, "free", p->size);
      }
    }
    cJSON_AddItemToArray(parts_arr, p_obj);
  }

  cJSON_AddStringToObject(root, "active_partition",
                          g_Active_WWW_Partition == 0 ? "www_0" : "www_1");
  cJSON_AddStringToObject(root, "target_partition",
                          g_Active_WWW_Partition == 0 ? "www_1" : "www_0");

  const char *status_info = cJSON_Print(root);
  httpd_resp_sendstr(req, status_info);

  free((void *)status_info);
  cJSON_Delete(root);

  return ESP_OK;
}

internal const httpd_uri_t api_ota_status_uri = {.uri = "/api/ota/status",
                                                 .method = HTTP_GET,
                                                 .handler =
                                                     api_ota_status_handler,
                                                 .user_ctx = NULL};