// ==UserScript==
// @name         编辑网页
// @namespace    http://tampermonkey.net/
// @version      1.2.9
// @description  这是一个能编辑任何网页文本的扩展
// @author       yhu
// @license      GPL-3.0
// @match        *://*/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    let currentElement = null;
    let isSourceEditing = false;
    let originalHtml = '';
    let sourceTextarea = null;
    let closeButton = null;
    let longPressTimer = null;
    let isLongPress = false;
    let errorOverlay = null;
    let errorCount = 0;
    const MAX_ERRORS = 5;

    function showErrorOverlay(errorMessage) {
        if (errorOverlay) {
            errorOverlay.remove();
            errorOverlay = null;
        }

        errorOverlay = document.createElement('div');
        errorOverlay.style.cssText = 'position:fixed;top:0;left:0;width:100%;height:100%;z-index:99999;background:rgba(0,0,0,0.85);display:flex;align-items:center;justify-content:center;font-family:Arial,sans-serif;';

        let panel = document.createElement('div');
        panel.style.cssText = 'background:#2d2d2d;border-radius:12px;padding:40px 50px;max-width:600px;width:90%;box-shadow:0 20px 60px rgba(0,0,0,0.8);border:1px solid #444;';

        let icon = document.createElement('div');
        icon.textContent = '⚠';
        icon.style.cssText = 'font-size:48px;text-align:center;color:#ff6b6b;margin-bottom:16px;';

        let title = document.createElement('h2');
        title.textContent = '脚本运行时发生错误';
        title.style.cssText = 'color:#fff;text-align:center;margin:0 0 12px 0;font-weight:400;font-size:24px;';

        let message = document.createElement('p');
        message.textContent = errorMessage || '未知错误，请检查控制台获取详细信息。';
        message.style.cssText = 'color:#aaa;text-align:center;margin:0 0 24px 0;font-size:15px;line-height:1.6;word-break:break-all;';

        let detail = document.createElement('p');
        detail.textContent = '错误计数: ' + (errorCount + 1) + '/' + MAX_ERRORS;
        detail.style.cssText = 'color:#666;text-align:center;margin:0 0 24px 0;font-size:13px;';

        let btnGroup = document.createElement('div');
        btnGroup.style.cssText = 'display:flex;gap:12px;justify-content:center;flex-wrap:wrap;';

        let reloadBtn = document.createElement('button');
        reloadBtn.textContent = '重新加载页面';
        reloadBtn.style.cssText = 'padding:10px 28px;background:#4a9eff;color:#fff;border:none;border-radius:6px;font-size:15px;cursor:pointer;transition:background 0.2s;';
        reloadBtn.addEventListener('mouseenter', () => { reloadBtn.style.background = '#6ab0ff'; });
        reloadBtn.addEventListener('mouseleave', () => { reloadBtn.style.background = '#4a9eff'; });
        reloadBtn.addEventListener('click', () => {
            window.location.reload();
        });

        let closeBtn = document.createElement('button');
        closeBtn.textContent = '关闭提示';
        closeBtn.style.cssText = 'padding:10px 28px;background:#555;color:#fff;border:none;border-radius:6px;font-size:15px;cursor:pointer;transition:background 0.2s;';
        closeBtn.addEventListener('mouseenter', () => { closeBtn.style.background = '#666'; });
        closeBtn.addEventListener('mouseleave', () => { closeBtn.style.background = '#555'; });
        closeBtn.addEventListener('click', () => {
            if (errorOverlay) {
                errorOverlay.remove();
                errorOverlay = null;
            }
        });

        btnGroup.appendChild(reloadBtn);
        btnGroup.appendChild(closeBtn);

        panel.appendChild(icon);
        panel.appendChild(title);
        panel.appendChild(message);
        panel.appendChild(detail);
        panel.appendChild(btnGroup);
        errorOverlay.appendChild(panel);
        document.body.appendChild(errorOverlay);
    }

    function errorHandler(error) {
        errorCount++;
        let errorMsg = error.message || String(error);
        if (error.stack) {
            errorMsg += '\n' + error.stack.split('\n').slice(0, 3).join('\n');
        }
        console.error('[编辑网页] 捕获到错误:', error);
        if (errorCount >= MAX_ERRORS) {
            showErrorOverlay('错误次数过多 (' + MAX_ERRORS + ')，脚本可能已进入不稳定状态。\n' + errorMsg);
            return;
        }
        showErrorOverlay(errorMsg);
    }

    window.addEventListener('error', function(e) {
        if (e.target.tagName === 'SCRIPT') {
            errorHandler(e.message || '脚本加载错误');
        }
    });

    function safeExecute(fn, context) {
        try {
            return fn.apply(context || null, Array.prototype.slice.call(arguments, 2));
        } catch (e) {
            errorHandler(e);
            return null;
        }
    }

    function edit(el) {
        safeExecute(function() {
            if (el.isContentEditable || el.closest('button,a,[role="button"]')) return;
            if (currentElement) {
                currentElement.contentEditable = 'false';
                currentElement.style.outline = '';
                currentElement.style.backgroundColor = '';
                currentElement = null;
            }
            el.contentEditable = 'true';
            el.style.outline = '2px dashed #4a9eff';
            el.style.backgroundColor = 'rgba(74,158,255,0.1)';
            el.focus();
            let obs = new MutationObserver(function() {
                el.style.color = '#4caf50';
                obs.disconnect();
            });
            obs.observe(el, { childList: true, subtree: true, characterData: true });
            el.addEventListener('blur', function() {
                obs.disconnect();
                el.contentEditable = 'false';
                el.style.outline = '';
                el.style.backgroundColor = '';
                currentElement = null;
            }, { once: true });
            currentElement = el;
        }, this, el);
    }

    function exitSourceEdit() {
        safeExecute(function() {
            if (sourceTextarea) {
                sourceTextarea.remove();
                sourceTextarea = null;
            }
            if (closeButton) {
                closeButton.remove();
                closeButton = null;
            }
            isSourceEditing = false;
        }, this);
    }

    function createCloseButton() {
        return safeExecute(function() {
            let btn = document.createElement('button');
            btn.textContent = '✕';
            btn.style.cssText = 'position:fixed;top:10px;right:10px;z-index:10001;background:#ff4444;color:white;border:none;border-radius:4px;font-size:20px;width:36px;height:36px;cursor:pointer;box-shadow:0 2px 8px rgba(0,0,0,0.3);transition:all 0.2s;display:flex;align-items:center;justify-content:center;';
            btn.addEventListener('mouseenter', function() {
                btn.style.background = '#ff6666';
                btn.style.transform = 'scale(1.05)';
            });
            btn.addEventListener('mouseleave', function() {
                btn.style.background = '#ff4444';
                btn.style.transform = 'scale(1)';
            });
            btn.addEventListener('click', function() {
                safeExecute(function() {
                    if (sourceTextarea && sourceTextarea.value !== originalHtml) {
                        let newDoc = sourceTextarea.value;
                        document.open();
                        document.write(newDoc);
                        document.close();
                    }
                    exitSourceEdit();
                }, this);
            });
            return btn;
        }, this) || null;
    }

    function setupLongPress() {
        document.body.addEventListener('mousedown', function(e) {
            safeExecute(function() {
                let link = e.target.closest('a');
                if (link && link.href) {
                    longPressTimer = setTimeout(function() {
                        isLongPress = true;
                        e.preventDefault();
                        e.stopPropagation();
                        window.open(link.href, '_blank');
                    }, 500);
                }
            }, this, e);
        }, true);

        document.body.addEventListener('mouseup', function() {
            safeExecute(function() {
                if (longPressTimer) {
                    clearTimeout(longPressTimer);
                    longPressTimer = null;
                }
                isLongPress = false;
            }, this);
        }, true);

        document.body.addEventListener('mouseleave', function() {
            safeExecute(function() {
                if (longPressTimer) {
                    clearTimeout(longPressTimer);
                    longPressTimer = null;
                }
                isLongPress = false;
            }, this);
        }, true);
    }

    function setupMainClick() {
        document.body.addEventListener('click', function(e) {
            safeExecute(function() {
                if (isLongPress) {
                    e.preventDefault();
                    e.stopPropagation();
                    isLongPress = false;
                    return;
                }

                let link = e.target.closest('a');
                if (link && link.href) {
                    e.preventDefault();
                    e.stopPropagation();
                    return;
                }

                if (e.detail === 2) {
                    if (isSourceEditing) {
                        e.preventDefault();
                        e.stopPropagation();
                        exitSourceEdit();
                        return;
                    }
                    e.preventDefault();
                    e.stopPropagation();
                    isSourceEditing = true;
                    originalHtml = document.documentElement.outerHTML;
                    let textarea = document.createElement('textarea');
                    textarea.value = originalHtml;
                    textarea.style.cssText = 'position:fixed;top:0;left:0;width:100%;height:100%;z-index:10000;font-family:monospace;font-size:14px;background:#1e1e1e;color:#d4d4d4;border:none;padding:10px;padding-top:50px;';
                    textarea.contentEditable = 'true';
                    document.body.appendChild(textarea);
                    textarea.focus();
                    sourceTextarea = textarea;

                    closeButton = createCloseButton();
                    if (closeButton) {
                        document.body.appendChild(closeButton);
                    }

                    textarea.addEventListener('blur', function() {
                        safeExecute(function() {
                            if (textarea.value !== originalHtml) {
                                let newDoc = textarea.value;
                                document.open();
                                document.write(newDoc);
                                document.close();
                            }
                            exitSourceEdit();
                        }, this);
                    }, { once: true });
                    return;
                }

                if (isSourceEditing) return;
                if (e.target.isContentEditable) return;
                if (currentElement && !currentElement.contains(e.target)) {
                    currentElement.contentEditable = 'false';
                    currentElement.style.outline = '';
                    currentElement.style.backgroundColor = '';
                    currentElement = null;
                }
                let node = e.target;
                while (node && node.nodeType === Node.TEXT_NODE) node = node.parentElement;
                if (!node) return;
                let target = node.closest('p,h1,h2,h3,h4,h5,h6,li,span,div,label,td,th,figcaption,legend');
                if (target) {
                    e.preventDefault();
                    e.stopPropagation();
                    edit(target);
                }
            }, this, e);
        }, true);
    }

    safeExecute(function() {
        setupLongPress();
        setupMainClick();
        console.log('[编辑网页] 脚本已加载 v1.2.9，错误控制已启用');
    }, this);
})();