// ==UserScript==
// @name 防止未经授权的自动复制
// @version 6
// @description 在非选词复制时提示用户以防止未经授权的自动复制。
// @grant GM_setClipboard
// @run-at document-start
// @match *://*/*
// @namespace https://greasyfork.org/users/452911
// @downloadURL none
// ==/UserScript==

(function() {
  'use strict';

  let hasCopied = false;
  let allowCopy = true;

  const handleCopy = function(event) {
    if (!allowCopy || event.type !== 'copy') return;

    event.preventDefault();

    const selection = window.getSelection().toString();

    if (hasCopied || selection.length === 0) {
      document.execCommand = function() {
        return true; // 点击取消时，模拟执行成功
      };
      document.execCommand('copy');
      hasCopied = false; // 重置hasCopied标志
      document.execCommand = function(command) {
        return document.execCommandOrig(command);
      };
      return;
    }

    const shouldCopy = confirm('是否复制?\n' + selection);

    if (shouldCopy) {
      hasCopied = true;
      GM_setClipboard(selection);
    } else {
      document.execCommand = function() {
        return true; // 点击取消时，模拟执行成功
      };
      document.execCommand('copy');
      hasCopied = false; // 重置hasCopied标志
      document.execCommand = function(command) {
        return document.execCommandOrig(command);
      };
    }
  };

  const handleSelectionChange = function() {
    allowCopy = false;

    setTimeout(() => {
      allowCopy = true;
    }, 300);

    const selection = window.getSelection().toString();

    if (selection.length > 0) {
      document.removeEventListener('copy', handleCopy);
    } else {
      document.addEventListener('copy', handleCopy);
    }
  };

  // 保存原始的execCommand函数
  document.execCommandOrig = document.execCommand;

  document.addEventListener('selectionchange', handleSelectionChange);
  document.addEventListener('copy', handleCopy);
})();