// GET /api/tasks/upcoming — Top 3 upcoming tasks per user (for Dashboard)

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

#include "todo.hpp"
#include "types.hpp"

internal esp_err_t api_tasks_upcoming_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 *users_arr = cJSON_AddArrayToObject(root, "users");

  for (int u = 0; u < MAX_USERS; u++)
  {
    if (!g_Users[u].active)
      continue;

    // Collect incomplete tasks for this user
    task_t *user_tasks[MAX_TASKS];
    int count = 0;

    for (int t = 0; t < MAX_TASKS; t++)
    {
      if (g_Tasks[t].active && g_Tasks[t].user_id == g_Users[u].id &&
          !g_Tasks[t].completed)
      {
        user_tasks[count++] = &g_Tasks[t];
      }
    }

    // Sort by due_date ascending
    sort_tasks_by_due_date(user_tasks, count);

    // Build user object with top 3
    cJSON *user_obj = cJSON_CreateObject();
    cJSON_AddNumberToObject(user_obj, "id", g_Users[u].id);
    cJSON_AddStringToObject(user_obj, "name", g_Users[u].name);

    cJSON *tasks_arr = cJSON_AddArrayToObject(user_obj, "tasks");
    int limit = count < 3 ? count : 3;
    for (int i = 0; i < limit; i++)
    {
      cJSON *t_obj = cJSON_CreateObject();
      cJSON_AddNumberToObject(t_obj, "id", user_tasks[i]->id);
      cJSON_AddStringToObject(t_obj, "title", user_tasks[i]->title);
      cJSON_AddNumberToObject(t_obj, "due_date",
                              (double)user_tasks[i]->due_date);
      cJSON_AddBoolToObject(t_obj, "completed", user_tasks[i]->completed);
      cJSON_AddItemToArray(tasks_arr, t_obj);
    }

    cJSON_AddItemToArray(users_arr, user_obj);
  }

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

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

  return ESP_OK;
}

internal const httpd_uri_t api_tasks_upcoming_uri = {
    .uri = "/api/tasks/upcoming",
    .method = HTTP_GET,
    .handler = api_tasks_upcoming_handler,
    .user_ctx = NULL};