// ==UserScript==
// @name         双击全屏（使用手机浏览器）
// @namespace    http://tampermonkey.net/
// @version      1.7
// @description  双击切换全屏，不影响视频操作，键盘弹出时对话框自动抬高。就这么一个简单的操作，居然没人能做好，那就自己来！
// @author       青野
// @match        *://*/*
// @grant        none
// @license      MIT
// @downloadURL https://update.greasyfork.icu/scripts/557840/%E5%8F%8C%E5%87%BB%E5%85%A8%E5%B1%8F%EF%BC%88%E4%BD%BF%E7%94%A8%E6%89%8B%E6%9C%BA%E6%B5%8F%E8%A7%88%E5%99%A8%EF%BC%89.user.js
// @updateURL https://update.greasyfork.icu/scripts/557840/%E5%8F%8C%E5%87%BB%E5%85%A8%E5%B1%8F%EF%BC%88%E4%BD%BF%E7%94%A8%E6%89%8B%E6%9C%BA%E6%B5%8F%E8%A7%88%E5%99%A8%EF%BC%89.meta.js
// ==/UserScript==

(function() {
    'use strict';

    let lastTapTime = 0;
    const doubleTapDelay = 300; // 双击间隔时间（毫秒）

    // 检查是否为可输入元素
    function isInputElement(element) {
        const tagName = element.tagName.toLowerCase();
        const inputTags = ['input', 'textarea', 'select'];
        const isContentEditable = element.isContentEditable;
        const isInputRole = element.getAttribute('role') === 'textbox';
        
        return inputTags.includes(tagName) || isContentEditable || isInputRole;
    }

    // 检查是否在视频控件区域
    function isVideoControls(element) {
        let current = element;
        while (current) {
            if (current.tagName && current.tagName.toLowerCase() === 'video') {
                return false; // 视频元素本身可以双击
            }
            // 检查是否是视频控件容器
            const className = current.className || '';
            if (typeof className === 'string' && 
                (className.includes('controls') || 
                 className.includes('player-controls') ||
                 className.includes('video-controls'))) {
                return true;
            }
            current = current.parentElement;
        }
        return false;
    }

    // 检查当前是否处于全屏状态
    function isFullscreen() {
        return !!(document.fullscreenElement || 
                  document.webkitFullscreenElement || 
                  document.mozFullScreenElement || 
                  document.msFullscreenElement);
    }

    // 进入全屏
    function enterFullscreen() {
        const elem = document.documentElement;
        if (elem.requestFullscreen) {
            elem.requestFullscreen();
        } else if (elem.webkitRequestFullscreen) {
            elem.webkitRequestFullscreen();
        } else if (elem.mozRequestFullScreen) {
            elem.mozRequestFullScreen();
        } else if (elem.msRequestFullscreen) {
            elem.msRequestFullscreen();
        }
    }

    // 退出全屏
    function exitFullscreen() {
        if (document.exitFullscreen) {
            document.exitFullscreen();
        } else if (document.webkitExitFullscreen) {
            document.webkitExitFullscreen();
        } else if (document.mozCancelFullScreen) {
            document.mozCancelFullScreen();
        } else if (document.msExitFullscreen) {
            document.msExitFullscreen();
        }
    }

    // 切换全屏
    function toggleFullscreen() {
        if (!isFullscreen()) {
            enterFullscreen();
        } else {
            exitFullscreen();
        }
    }

    // 双击事件处理
    function handleTap(e) {
        const target = e.target;
        
        // 忽略输入元素
        if (isInputElement(target)) {
            return;
        }
        
        // 忽略视频控件区域
        if (isVideoControls(target)) {
            return;
        }

        const currentTime = new Date().getTime();
        const tapLength = currentTime - lastTapTime;
        
        if (tapLength < doubleTapDelay && tapLength > 0) {
            // 双击检测成功
            e.preventDefault();
            toggleFullscreenWithFlag();
            lastTapTime = 0; // 重置
        } else {
            lastTapTime = currentTime;
        }
    }

    // 监听触摸结束事件（移动端）
    document.addEventListener('touchend', function(e) {
        // 确保只是单点触摸
        if (e.changedTouches.length === 1) {
            handleTap(e);
        }
    }, { passive: false });

    // 处理返回键：在全屏状态下，保持全屏并执行返回上一页
    // 核心思路：检测非双击导致的全屏退出，自动重新进入全屏
    let isDoubleTapExit = false; // 标记是否是双击主动退出全屏
    
    // 重写 toggleFullscreen，标记双击退出
    function toggleFullscreenWithFlag() {
        if (!isFullscreen()) {
            enterFullscreen();
        } else {
            isDoubleTapExit = true;
            exitFullscreen();
        }
    }

    // 监听全屏状态变化
    function handleFullscreenChange() {
        if (!isFullscreen()) {
            // 全屏被退出了
            if (isDoubleTapExit) {
                // 是用户双击主动退出的，不做处理
                isDoubleTapExit = false;
            } else {
                // 不是双击退出的（比如按了返回键），重新进入全屏
                // 使用 requestAnimationFrame 确保在下一帧执行
                requestAnimationFrame(() => {
                    enterFullscreen();
                });
            }
        }
    }

    document.addEventListener('fullscreenchange', handleFullscreenChange);
    document.addEventListener('webkitfullscreenchange', handleFullscreenChange);
    document.addEventListener('mozfullscreenchange', handleFullscreenChange);
    document.addEventListener('MSFullscreenChange', handleFullscreenChange);

    // 键盘弹出时对话框抬高处理
    function handleKeyboardResize() {
        // 检测可能的对话框元素
        const dialogSelectors = [
            'dialog',
            '[role="dialog"]',
            '[role="alertdialog"]',
            '.modal',
            '.dialog',
            '.popup',
            '[class*="modal"]',
            '[class*="dialog"]',
            '[class*="popup"]'
        ];

        const visualViewport = window.visualViewport;
        
        if (visualViewport) {
            visualViewport.addEventListener('resize', function() {
                const keyboardHeight = window.innerHeight - visualViewport.height;
                
                dialogSelectors.forEach(selector => {
                    const dialogs = document.querySelectorAll(selector);
                    dialogs.forEach(dialog => {
                        if (dialog.offsetParent !== null) { // 可见的对话框
                            if (keyboardHeight > 100) { // 键盘可能已弹出
                                dialog.style.transition = 'transform 0.3s ease';
                                dialog.style.transform = `translateY(-${keyboardHeight / 2}px)`;
                            } else {
                                dialog.style.transform = 'translateY(0)';
                            }
                        }
                    });
                });
            });

            visualViewport.addEventListener('scroll', function() {
                // 保持对话框位置
                const scrollTop = visualViewport.offsetTop;
                dialogSelectors.forEach(selector => {
                    const dialogs = document.querySelectorAll(selector);
                    dialogs.forEach(dialog => {
                        if (dialog.offsetParent !== null && 
                            dialog.style.position === 'fixed') {
                            dialog.style.top = `${scrollTop}px`;
                        }
                    });
                });
            });
        }

        // 备用方案：监听焦点事件
        document.addEventListener('focusin', function(e) {
            if (isInputElement(e.target)) {
                setTimeout(() => {
                    dialogSelectors.forEach(selector => {
                        const dialogs = document.querySelectorAll(selector);
                        dialogs.forEach(dialog => {
                            if (dialog.offsetParent !== null) {
                                dialog.scrollIntoView({ behavior: 'smooth', block: 'center' });
                            }
                        });
                    });
                }, 300);
            }
        });

        document.addEventListener('focusout', function(e) {
            if (isInputElement(e.target)) {
                setTimeout(() => {
                    dialogSelectors.forEach(selector => {
                        const dialogs = document.querySelectorAll(selector);
                        dialogs.forEach(dialog => {
                            dialog.style.transform = 'translateY(0)';
                        });
                    });
                }, 100);
            }
        });
    }

    // 初始化键盘处理
    handleKeyboardResize();

    console.log('🐵 双击全屏脚本已加载 v1.2 - 作者：青野');
})();