// clipboard.ts — 统一剪贴板复制（Clipboard API + execCommand 回退）// Logan.Li

/** 复制文本到剪贴板，兼容 HTTP / 非安全上下文 // Logan.Li */
export async function copyToClipboard(text: string): Promise<boolean> {
  if (!text) return false;

  // 优先使用 Clipboard API
  try {
    if (typeof navigator !== 'undefined' && navigator.clipboard?.writeText) {
      await navigator.clipboard.writeText(text);
      return true;
    }
  } catch {
    /* 回退 execCommand */
  }

  // execCommand 回退（参考 AgentWizard）// Logan.Li
  if (typeof document === 'undefined') return false;

  const textArea = document.createElement('textarea');
  textArea.value = text;
  textArea.style.position = 'fixed';
  textArea.style.top = '0';
  textArea.style.left = '0';
  textArea.style.width = '2em';
  textArea.style.height = '2em';
  textArea.style.padding = '0';
  textArea.style.border = 'none';
  textArea.style.outline = 'none';
  textArea.style.boxShadow = 'none';
  textArea.style.background = 'transparent';
  textArea.style.opacity = '0';
  textArea.style.pointerEvents = 'none';
  textArea.style.zIndex = '-1';
  textArea.style.fontSize = '16px';
  textArea.contentEditable = 'true';
  textArea.readOnly = true;
  document.body.appendChild(textArea);

  textArea.focus();
  textArea.select();
  if (textArea.setSelectionRange) {
    textArea.setSelectionRange(0, text.length);
  }

  let success = false;
  try {
    success = document.execCommand('copy');
  } catch {
    success = false;
  }
  document.body.removeChild(textArea);
  return success;
}

/** 从剪贴板读取文本；非 HTTPS / 无权限时返回 null，由调用方走手动粘贴回退 // Logan.Li */
export async function readFromClipboard(): Promise<string | null> {
  try {
    if (typeof navigator !== 'undefined' && navigator.clipboard?.readText) {
      return await navigator.clipboard.readText();
    }
  } catch {
    return null;
  }
  return null;
}