// ==UserScript==
// @name         PTA剪贴板逐行打字（自动清除缩进）
// @namespace    http://tampermonkey.net/
// @version      1.6
// @description  模拟Python版逻辑：检测每行前是否有缩进空格，有则删除，再输入内容
// @author       You
// @match        https://pintia.cn/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    let isPaused = false;
    let isRunning = false;

    let container = document.createElement('div');
    container.style.cssText = 'position:fixed;top:10px;right:10px;z-index:9999;display:flex;gap:10px;';
    document.body.appendChild(container);

    let startBtn = document.createElement('button');
    startBtn.innerHTML = '📋 自动打字';
    startBtn.style.cssText = 'padding:10px 20px;background:#4CAF50;color:white;border:none;border-radius:5px;cursor:pointer;font-size:16px;';
    container.appendChild(startBtn);

    let pauseBtn = document.createElement('button');
    pauseBtn.innerHTML = '⏸️ 暂停';
    pauseBtn.style.cssText = 'padding:10px 20px;background:#FF9800;color:white;border:none;border-radius:5px;cursor:pointer;font-size:16px;display:none;';
    container.appendChild(pauseBtn);

    pauseBtn.onclick = function() {
        isPaused = !isPaused;
        pauseBtn.innerHTML = isPaused ? '▶️ 继续' : '⏸️ 暂停';
        pauseBtn.style.background = isPaused ? '#2196F3' : '#FF9800';
    };

    async function deleteIndentIfExists() {
        // 模拟 Shift+Home 选中光标前面到行首的内容
        // 用键盘事件模拟
        let editor = document.activeElement;
        
        // Shift+Home
        editor.dispatchEvent(new KeyboardEvent('keydown', {
            key: 'Home',
            code: 'Home',
            keyCode: 36,
            shiftKey: true,
            bubbles: true,
            cancelable: true
        }));
        await new Promise(r => setTimeout(r, 50));
        
        // 复制选中内容来检测
        let oldClipboard = '';
        try {
            oldClipboard = await navigator.clipboard.readText();
        } catch(e) {}
        
        document.execCommand('copy');
        await new Promise(r => setTimeout(r, 50));
        
        let selected = '';
        try {
            selected = await navigator.clipboard.readText();
            // 恢复剪贴板
            await navigator.clipboard.writeText(oldClipboard);
        } catch(e) {}
        
        // 判断选中内容是否只有空格
        if (selected && selected.trim() === '') {
            // 纯空格，删除
            document.execCommand('delete');
        } else {
            // 包含代码，取消选中（按右方向键）
            editor.dispatchEvent(new KeyboardEvent('keydown', {
                key: 'ArrowRight',
                code: 'ArrowRight',
                keyCode: 39,
                bubbles: true
            }));
        }
        
        await new Promise(r => setTimeout(r, 100));
    }

    async function typeFast(text) {
        for (let char of text) {
            while (isPaused) {
                await new Promise(r => setTimeout(r, 200));
            }
            document.execCommand('insertText', false, char);
            await new Promise(r => setTimeout(r, 50));
        }
    }

    startBtn.onclick = async function() {
        if (isRunning) return;
        isRunning = true;
        startBtn.style.display = 'none';
        pauseBtn.style.display = 'block';

        try {
            let text = await navigator.clipboard.readText();
            let lines = text.split('\n');

            let editor = document.querySelector('.CodeMirror textarea') ||
                         document.querySelector('.cm-content') ||
                         document.activeElement;

            if (!editor) {
                alert('请先点击PTA的代码编辑区域');
                isRunning = false;
                startBtn.style.display = 'block';
                pauseBtn.style.display = 'none';
                return;
            }

            editor.focus();
            await new Promise(r => setTimeout(r, 300));

            for (let i = 0; i < lines.length; i++) {
                while (isPaused) {
                    await new Promise(r => setTimeout(r, 200));
                }

                if (i === 0) {
                    // 第一行直接输入
                    if (lines[i]) {
                        await typeFast(lines[i]);
                    }
                    // 回车
                    document.execCommand('insertText', false, '\n');
                    await new Promise(r => setTimeout(r, 150));
                } else {
                    // 检测并删除缩进
                    await deleteIndentIfExists();
                    
                    if (lines[i]) {
                        await typeFast(lines[i]);
                    }
                    
                    // 回车
                    document.execCommand('insertText', false, '\n');
                    await new Promise(r => setTimeout(r, 150));
                }
            }

            alert('✅ 输入完成！');
        } catch(e) {
            alert('❌ 请先复制代码，点击编辑区域，再按按钮');
            console.error(e);
        }

        isRunning = false;
        isPaused = false;
        startBtn.style.display = 'block';
        pauseBtn.style.display = 'none';
        pauseBtn.innerHTML = '⏸️ 暂停';
        pauseBtn.style.background = '#FF9800';
    };
})();