// SPDX-License-Identifier: LGPL-2.1-or-later
#pragma once
#include <windows.h>
#include <algorithm>
#include <string>

constexpr size_t max_accessible_units = 4096;
constexpr size_t max_controller_units = 65536;
constexpr size_t max_reader_event_bytes = 131072;
constexpr size_t max_reader_queue_bytes = 1048576;

inline std::string bounded_accessible_text(const WCHAR *text, size_t length) {
  if (!text) return {};
  length = std::min(length, max_accessible_units);
  // MSAA strings can include padding past their first terminating NUL.
  size_t used = 0;
  while (used < length && text[used]) ++used;
  if (used && text[used - 1] >= 0xd800 && text[used - 1] <= 0xdbff) --used;
  if (!used) return {};
  int size = WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS, text,
      static_cast<int>(used), nullptr, 0, nullptr, nullptr);
  if (size <= 0) return {};
  std::string result(size, '\0');
  WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS, text,
      static_cast<int>(used), result.data(), size, nullptr, nullptr);
  return result;
}

inline bool controller_text_fits(const WCHAR *text) {
  if (!text) return false;
  for (size_t i = 0; i <= max_controller_units; ++i)
    if (!text[i]) return true;
  return false;
}