// ==UserScript==
// @name         SJTU Auto Evaluator
// @namespace    http://tampermonkey.net/
// @version      1.1
// @description  Automatically clicks the first radio button ("非常认同") and fills text areas for SJTU teaching evaluations.
// @author       You
// @match        *://i.sjtu.edu.cn/*
// @match        *://*/xspjgl/*
// @match        *://*/*xspj*
// @run-at       document-end
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    function injectButton() {
        // Prevent duplicate buttons if the script runs multiple times
        if (document.getElementById('auto-eval-btn')) return;
        if (!document.body) return;

        const btn = document.createElement('button');
        btn.id = 'auto-eval-btn';
        btn.innerText = 'Auto Select All: 非常认同';
        Object.assign(btn.style, {
            position: 'fixed',
            top: '20px',
            right: '20px',
            zIndex: '999999', // Increased z-index
            padding: '10px 15px',
            backgroundColor: '#28a745',
            color: 'white',
            border: 'none',
            borderRadius: '5px',
            cursor: 'pointer',
            fontWeight: 'bold',
            boxShadow: '0 2px 5px rgba(0,0,0,0.2)'
        });

        btn.onclick = function(e) {
            e.preventDefault();

            let radioCount = 0;
            let textCount = 0;

            // Target the first option in every metric group
            const firstOptions = document.querySelectorAll('.input-xspj-1 input[type="radio"]');

            firstOptions.forEach(radio => {
                if (!radio.checked) {
                    radio.click();
                    radioCount++;
                }
            });

            // Target the required subjective text areas
            const textareas = document.querySelectorAll('textarea.input-zgpj');
            textareas.forEach(ta => {
                if (!ta.value.trim()) {
                    ta.value = "老师上课十分认真负责，教学内容丰富，非常满意。";
                    ta.dispatchEvent(new Event('input', { bubbles: true }));
                    ta.dispatchEvent(new Event('change', { bubbles: true }));
                    textCount++;
                }
            });

            const originalText = btn.innerText;
            btn.innerText = `Done! (${radioCount} options, ${textCount} texts)`;
            btn.style.backgroundColor = '#1e7e34';

            setTimeout(() => {
                btn.innerText = originalText;
                btn.style.backgroundColor = '#28a745';
            }, 2000);
        };

        document.body.appendChild(btn);
    }

    // 1. Try to inject immediately
    injectButton();

    // 2. Try again after the DOM is fully loaded
    window.addEventListener('DOMContentLoaded', injectButton);

    // 3. Brute-force fallback for delayed iframe/AJAX rendering
    setTimeout(injectButton, 1500);
    setTimeout(injectButton, 3000);

})();