OpenNotes/codeprep.html at main · Tebby2008/OpenNotes

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<!DOCTYPE html>

<head>

<title>CodePrep - Your user-friendly coding practice platform</title>

tailwind.config = {

theme: {

extend: {

fontFamily: {

sans: ['Inter', 'sans-serif'],

mono: ['Source Code Pro', 'ui-monospace', 'SFMono-Regular', 'Menlo', 'Monaco', 'Consolas', 'Liberation Mono', 'Courier New', 'monospace'],

colors: {

'accent-blue': '#198cff',

'accent-dark-bg': '#1C1C1E',

'glass-surface': 'rgba(44, 44, 46, 0.85)',

}

</script>

<style>

@import url('https://fonts.googleapis.com/css2?family=Inter:[email protected]&display=swap');

@import url('https://fonts.googleapis.com/css2?family=Source+Code+Pro:wght@400;600&display=swap');

@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,[email protected],100..700,0..1,-50..200');

body {

min-height: 100vh;

display: flex;

flex-direction: column;

background: linear-gradient(135deg, #1f2937, #0f172a);

color: #E5E5E5;

}

.glass-card {

background-color: var(--tw-color-glass-surface);

backdrop-filter: blur(16px);

-webkit-backdrop-filter: blur(16px);

border: 1px solid rgba(255, 255, 255, 0.1);

transition: all 0.3s ease;

}

textarea::-webkit-scrollbar, .scroll-area::-webkit-scrollbar {

width: 8px;

}

textarea::-webkit-scrollbar-thumb, .scroll-area::-webkit-scrollbar-thumb {

background-color: rgba(255, 255, 255, 0.3);

border-radius: 4px;

}

textarea::-webkit-scrollbar-track, .scroll-area::-webkit-scrollbar-track {

background: transparent;

}

#code-editor {

caret-color: #198cff;

}

.file-tab {

margin-right: 0.5rem;

padding: 0.5rem 1rem;

font-size: 0.875rem;

font-weight: 500;

border-top-left-radius: 0.75rem;

border-top-right-radius: 0.75rem;

transition: all 150ms ease-in-out;

cursor: pointer;

background-color: rgba(41, 44, 51, 0.8);

color: #9ca3af;

white-space: nowrap;

overflow: hidden;

text-overflow: ellipsis;

border-bottom: 2px solid #27272a;

}

.file-tab:not(.active):hover {

background-color: #374151;

color: #ffffff;

}

.file-tab.active {

background-color: rgba(17, 24, 39, 0.6);

color: #ffffff;

font-weight: 600;

border-bottom: 2px solid transparent;

}

.modal-content-transition {

transition: opacity 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);

}

.modal-enter {

opacity: 0;

transform: scale(0.9);

}

.modal-enter-active {

opacity: 1;

transform: scale(1);

}

.modal-leave-active {

opacity: 0;

transform: scale(0.9);

}

.backdrop-transition {

transition: opacity 0.3s ease-out;

opacity: 0;

}

.backdrop-active {

opacity: 1;

}

.scrollable-content {

max-height: 50vh;

overflow-y: auto;

padding-right: 1rem;

}

.spinner {

border: 4px solid rgba(255, 255, 255, 0.1);

border-left-color: #198cff;

border-radius: 50%;

width: 30px;

height: 30px;

animation: spin 1s linear infinite;

}

@keyframes spin {

to { transform: rotate(360deg); }

}

</style>

</head>

<h1 class="text-6xl font-bold text-white tracking-tight p-6">\\: CodePrep</h1>

<p class="text-gray-400 mt-1 text-sm">Your user-friendly coding practice platform from OpenNotes. Tailored specifically for your AP CSA needs.</p>

Explore OpenNotes Platform

</a>

</header>

<h2 id="current-problem-title" class="text-xl font-semibold text-accent-blue">Loading Problems...</h2>

</div>

Fetching problem data from **problems.json**...

</div>

<h2 class="text-xl font-semibold mb-4 text-white">Your Solution (Java)</h2>

</div>

+ Add Class

</button>

- Remove Class

</button>

</div>

</div>

Problem Selector

</button>

Random Problem

</button>

</div>

Check Code

</button>

</div>

<h3 class="text-2xl font-bold mb-4 text-white">Select Challenge</h3>

<p class="text-sm text-gray-400 mb-2">Filter by Difficulty:</p>

</div>

</div>

</button>

</div>

<h3 class="text-2xl font-bold mb-4 text-red-500">Confirm Submission</h3>

<p>⚠️ <b>Are you sure you want to submit your code?</b></p>

<p class="text-sm text-yellow-400">This simulates a formal testing environment. Once submitted your current attempt will be graded. Revise your code carefully beforehand!</p>

</div>

Cancel

</button>

Submit Final Code

</button>

</div>

</div>

</div>

</button>

</div>

<p class="text-white text-lg font-medium">Processing request...</p>

<p class="text-gray-400 text-sm mt-1">Analyzing your code for conceptual errors.</p>

</div>

OpenNotes

</a>

Github

</a>

</div>

<span class="material-symbols-outlined text-lg">visibility</span>

</div>

</footer>

const editor = document.getElementById('code-editor');

const titleEl = document.getElementById('current-problem-title');

const difficultyEl = document.getElementById('current-problem-difficulty');

const descriptionEl = document.getElementById('problem-description');

const problemListEl = document.getElementById('problem-list');

const filterContainerEl = document.getElementById('difficulty-filters');

const randomBtnEl = document.getElementById('random-problem-btn');

const checkCodeBtn = document.getElementById('check-code-btn');

const fileManagerEl = document.getElementById('file-manager');

const fileTabsEl = document.getElementById('file-tabs');

const resultModalMessageEl = document.getElementById('result-modal-message');

const WORKER_BASE_URL = 'https://java-compiler-worker.tebby2008-li.workers.dev';

const COMPILER_URL = `${WORKER_BASE_URL}/compile`;

const TUTOR_URL = `${WORKER_BASE_URL}/tutor`;

const PROBLEM_DATA_URL = 'https://raw.githubusercontent.com/Tebby2008/OpenNotes/main/resources/coding_problems.json'; // URL for the JSON file

const TRANSITION_DURATION = 300;

const API_URL = "https://open-notes.tebby2008-li.workers.dev";

const websiteViewsEl = document.getElementById('websiteViews');

let problems = [];

let currentProblem = null;

let activeFilters = {

'Easy': true,

'Medium': true,

'Hard': true

};

let codeFiles = [];

let currentFileIndex = 0;

function showModalWithTransition(modalId, contentId) {

const modal = document.getElementById(modalId);

const content = contentId ? document.getElementById(contentId) : null;

modal.classList.remove('hidden');

setTimeout(() => {

modal.classList.add('backdrop-active');

if (content) {

content.classList.remove('modal-enter');

content.classList.add('modal-enter-active');

}

}, 10);

}

function hideModalWithTransition(modalId, contentId) {

const modal = document.getElementById(modalId);

const content = contentId ? document.getElementById(contentId) : null;

modal.classList.remove('backdrop-active');

if (content) {

content.classList.remove('modal-enter-active');

content.classList.add('modal-leave-active');

}

setTimeout(() => {

modal.classList.add('hidden');

if (content) {

content.classList.remove('modal-leave-active');

content.classList.add('modal-enter');

}

}, TRANSITION_DURATION);

}

function showLoadingModal() {

showModalWithTransition('loading-modal', null);

}

function hideLoadingModal() {

hideModalWithTransition('loading-modal', null);

}

function convertMarkdownToHtml(text) {

if (!text) return '';

text = text.replace(/`([^`]+)`/g, '<code class="font-mono text-yellow-300 bg-gray-800 px-1 py-0.5 rounded">\$1</code>');

text = text.replace(/\*\*([^\*]+)\*\*/g, '<strong>\$1</strong>');

text = text.replace(/\n/g, '<br>');

return text;

}

editor.addEventListener('input', () => {

if (codeFiles.length > 0 && currentFileIndex >= 0) {

const currentContent = editor.value;

codeFiles[currentFileIndex].content = currentContent;

const classNameRegex = /(?:public|private|protected)\s+class\s+([a-zA-Z_$][a-zA-Z0-9_$]*)/;

const match = currentContent.match(classNameRegex);

let newName = codeFiles[currentFileIndex].name;

if (match && match[1]) {

newName = match[1] + '.java';

} else if (!codeFiles[currentFileIndex].name.startsWith('<unnamed_')) {

newName = 'Class.java';

} else if (codeFiles[currentFileIndex].name.startsWith('<unnamed_')) {

newName = codeFiles[currentFileIndex].name;

}

if (codeFiles[currentFileIndex].name !== newName) {

codeFiles[currentFileIndex].name = newName;

renderFileTabs();

}

});

editor.addEventListener('keydown', function(e) {

if (e.key === 'Tab') {

e.preventDefault();

const start = this.selectionStart;

const end = this.selectionEnd;

const fourSpaces = ' ';

this.value = this.value.substring(0, start) + fourSpaces + this.value.substring(end);

this.selectionStart = this.selectionEnd = start + fourSpaces.length;

}

});

function getDifficultyStyle(difficulty) {

switch (difficulty) {

case 'Easy':

return { text: 'text-green-300', bg: 'bg-green-700/30' };

case 'Medium':

return { text: 'text-yellow-300', bg: 'bg-yellow-700/30' };

case 'Hard':

return { text: 'text-red-300', bg: 'bg-red-700/30' };

default:

return { text: 'text-gray-300', bg: 'bg-gray-700/30' };

}

function loadProblem(problem) {

currentProblem = problem;

titleEl.textContent = problem.title;

descriptionEl.innerHTML = convertMarkdownToHtml(problem.description);

codeFiles = problem.requiredClasses.map(name => ({

name: name,

content: ''

}));

currentFileIndex = 0;

const isMultiClass = problem.requiredClasses.length > 1;

fileManagerEl.classList.toggle('hidden', !isMultiClass);

if (codeFiles.length > 0) {

editor.value = codeFiles[currentFileIndex].content;

} else {

editor.value = '';

}

const style = getDifficultyStyle(problem.difficulty);

difficultyEl.textContent = problem.difficulty;

difficultyEl.className = `px-3 py-1 text-xs rounded-full font-medium ${style.text} ${style.bg}`;

renderFileTabs();

hideResultModal();

toggleProblemSelector(false);

}

function renderFileTabs() {

fileTabsEl.innerHTML = '';

document.getElementById('remove-file-btn').classList.toggle('opacity-50', codeFiles.length <= 1);

document.getElementById('remove-file-btn').disabled = codeFiles.length <= 1;

codeFiles.forEach((file, index) => {

const tab = document.createElement('div');

tab.textContent = file.name;

const isActive = index === currentFileIndex;

tab.className = `file-tab ${isActive ? 'active' : ''}`;

tab.onclick = () => switchFile(index);

fileTabsEl.appendChild(tab);

});

}

function switchFile(index) {

if (index === currentFileIndex) return;

if (codeFiles.length > 0) {

codeFiles[currentFileIndex].content = editor.value;

}

currentFileIndex = index;

editor.value = codeFiles[currentFileIndex].content;

renderFileTabs();

}

function addFile() {

const newFileName = `<unnamed_${Date.now()}>.java`;

codeFiles.push({ name: newFileName, content: '' });

switchFile(codeFiles.length - 1);

}

function removeFile() {

if (codeFiles.length > 1) {

codeFiles.splice(currentFileIndex, 1);

currentFileIndex = Math.max(0, currentFileIndex - 1);

editor.value = codeFiles[currentFileIndex].content;

renderFileTabs();

}

function loadRandomProblem() {

let filteredProblems = problems.filter(p => activeFilters[p.difficulty]);

if (currentProblem) {

filteredProblems = filteredProblems.filter(p => p.id !== currentProblem.id);

}

if (filteredProblems.length === 0) {

const message = currentProblem

? 'Only the current problem is available in the current filter settings.'

: 'No problems match the current filter. Please adjust the difficulty settings.';

showResultModal('No New Problems Available', message, 'error', null);

return;

}

const randomIndex = Math.floor(Math.random() * filteredProblems.length);

loadProblem(filteredProblems[randomIndex]);

}

function confirmSubmission() {

if (!currentProblem) {

showResultModal('Error', 'Please select a problem before attempting to check code.', 'error', null);

return;

}

if (codeFiles.length > 0 && currentFileIndex >= 0) {

codeFiles[currentFileIndex].content = editor.value;

}

showModalWithTransition('confirmation-modal', 'confirmation-content');

}

function cancelSubmission() {

hideModalWithTransition('confirmation-modal', 'confirmation-content');

}

const TEST_DELIMITER = "__TEST_CASE_DELIMITER__";

function createJavaTestDriver(tests, problem) {

let mainMethodBody = '';

tests.forEach((test, index) => {

let callString = problem.driverCallTemplate;

const inputParts = test.input.split(',').map(s => s.trim());

const inputRegex = /##__IN_(\d+)__##/g;

callString = callString.replace(inputRegex, (match, p1) => {

const i = parseInt(p1, 10) - 1;

return (i >= 0 && i < inputParts.length) ? inputParts[i] : match;

});

mainMethodBody += `

System.out.println("${TEST_DELIMITER}");

${callString};

System.out.println("${TEST_DELIMITER}");

});

return `

class TestDriver {

public static void main(String[] args) {

${mainMethodBody}

}

async function handleConfirmedSubmission() {

cancelSubmission();

showLoadingModal();

checkCodeBtn.textContent = 'Checking Code...';

checkCodeBtn.disabled = true;

if (codeFiles.length > 0) {

codeFiles[currentFileIndex].content = editor.value;

}

const userCode = codeFiles.map(f => f.content).join('\n');

const MAX_CODE_LENGTH = 2000;

const JAVA_CHARSET_REGEX = /[^\w\s{}\[\]();,.:<>="'+\/\%&|^\~?\@\#\$\-\\]/g;

let finalResults = [];

if (userCode.length > MAX_CODE_LENGTH) {

finalResults.push({

status: 'FAILED_VALIDATION',

actual: `Your combined code length is ${userCode.length} characters, which exceeds the limit of ${MAX_CODE_LENGTH} characters. Please shorten your code.`,

input: 'Length Check',

expected: `Code length <= ${MAX_CODE_LENGTH} characters`

});

}

const illegalCharsMatch = userCode.match(JAVA_CHARSET_REGEX);

if (illegalCharsMatch) {

const uniqueIllegalChars = [...new Set(illegalCharsMatch)].join(', ');

finalResults.push({

status: 'FAILED_VALIDATION',

actual: `Found non-standard characters in your code which could cause compilation issues. The following characters were flagged: ${uniqueIllegalChars}. Only use standard Java/ASCII characters.`,

input: 'Character Set Check',

expected: 'Only standard Java/ASCII characters'

});

}

if (finalResults.length > 0) {

hideLoadingModal();

checkCodeBtn.textContent = 'Check Code';

checkCodeBtn.disabled = false;

showFailureResult(finalResults, userCode);

return;

}

if (userCode.trim() === "") {

hideLoadingModal();

showFailureResult([ { status: 'FAILED_COMPILATION', actual: 'Your editor is empty. The compiler requires a complete class definition to proceed.', input: '', expected: '' } ], userCode);

return;

}

const isFullProgramMode = currentProblem.runAsMain;

const tests = currentProblem.tests;

let fullProgram;

let expectedOutput;

let inputForCompiler = null;

if (isFullProgramMode) {

fullProgram = userCode;

inputForCompiler = tests.map(t => t.input).join(`\n${TEST_DELIMITER}\n`);

expectedOutput = tests.map(t => t.expectedOutput).join('');

} else {

const driverCode = createJavaTestDriver(tests, currentProblem);

fullProgram = userCode + '\n' + driverCode;

expectedOutput = tests.map(t => t.expectedOutput).join('');

}

try {

const response = await fetch(COMPILER_URL, {

method: 'POST',

headers: { 'Content-Type': 'application/json' },

body: JSON.stringify({

code: fullProgram,

input: inputForCompiler

})

});

const rawOutput = await response.text();

let combinedStatus = 'PASSED';

let actualOutput = rawOutput;

let compilationFailed = false;

if (rawOutput.startsWith('COMPILATION_ERROR:')) {

combinedStatus = 'FAILED_COMPILATION';

compilationFailed = true;

} else if (rawOutput.startsWith('RUNTIME_ERROR:')) {

combinedStatus = 'FAILED_RUNTIME';

compilationFailed = true;

}

if (compilationFailed) {

finalResults = [{

input: 'All Tests',

expected: '',

actual: actualOutput,

status: combinedStatus

}];

} else {

const expectedOutputsCount = tests.length;

const rawParts = actualOutput.split(TEST_DELIMITER);

let outputs = [];

for (let i = 0; i < expectedOutputsCount; i++) {

const outputIndex = (2 * i) + 1;

if (outputIndex < rawParts.length) {

outputs.push(rawParts[outputIndex].trim());

} else {

outputs.push("[ERROR: Output Missing]");

}

if (outputs.length !== tests.length) {

combinedStatus = 'FAILED_LOGIC';

finalResults = [{

input: 'Test Parsing Error',

expected: 'Expected ' + tests.length + ' test results.',

actual: `Received ${outputs.length} results. Raw output (first 500 chars): ${actualOutput.substring(0, 500)}`,

status: combinedStatus

}];

} else {

finalResults = tests.map((test, i) => {

const rawActual = outputs[i];

const rawExpected = test.expectedOutput;

const sanitize = (str) => {

if (typeof str !== 'string') return '';

str = str.replace(/\r\n/g, '\n');

return str.trim();

};

const isRandomIntMatch = (expected, actual) => {

const randomIntRegex = /^##__Randint_(-?\d+)_(-?\d+)__##$/;

const match = expected.trim().match(randomIntRegex);

if (match) {

const min = parseInt(match[1], 10);

const max = parseInt(match[2], 10);

const actualInt = parseInt(actual, 10);

if (actual === String(actualInt) && !isNaN(actualInt) && actualInt >= min && actualInt <= max) {

return true;

}

return false;

} else {

return actual === sanitize(expected);

}

};

const actual = sanitize(rawActual);

let status = isRandomIntMatch(rawExpected, actual) ? 'PASSED' : 'FAILED_LOGIC';

if (status !== 'PASSED') { combinedStatus = 'FAILED_LOGIC'; }

return {

input: test.input,

expected: rawExpected,

actual: rawActual,

status: status

};

});

}

hideLoadingModal();

const firstFailure = finalResults.find(r => r.status.startsWith('FAILED'));

if (firstFailure) {

showFailureResult(finalResults, userCode);

} else {

showSuccessResult(finalResults);

}

} catch (error) {

hideLoadingModal();

showFailureResult([ { status: 'FAILED_NETWORK', actual: `Failed to reach the compiler service: ${error.message}.`, input: '', expected: '' } ], userCode);

return;

}

let lastFailedCode = '';

function showSuccessResult(testResults) {

checkCodeBtn.textContent = 'Check Code';

checkCodeBtn.disabled = false;

const passedCount = testResults.filter(r => r.status === 'PASSED').length;

let testOutput = "Compilation Success! All tests passed.\n\n";

testResults.forEach((test, index) => {

testOutput += `[✅ PASSED] Test Case ${index + 1} (Input: ${test.input})\n`;

testOutput += ` - Expected Output: ${test.expected}\n`;

testOutput += ` - Actual Output: ${test.actual}\n\n`;

});

const message = `Congratulations! All ${passedCount}/${testResults.length} tests passed successfully. You have completed the challenge.`;

const actions = document.getElementById('result-modal-actions');

actions.innerHTML = `

Select Next Problem

</button>

showResultModal('Challenge Complete', message, 'success', testOutput);

}

function showFailureResult(testResults, userCode) {

lastFailedCode = userCode;

checkCodeBtn.textContent = 'Check Code';

checkCodeBtn.disabled = false;

const firstFailure = testResults ? testResults.find(r => r.status.startsWith('FAILED')) || testResults[0] : null;

const isCompilationError = firstFailure && firstFailure.status.includes('COMPILATION');

const isRuntimeError = firstFailure && firstFailure.status.includes('RUNTIME');

let title = 'Test Failed: Logic Error';

let message = 'Your code ran, but the output did not match expectations for one or more test cases. Review the detailed test results.';

let codeContent = '';

let testOutput = '';

if (testResults) {

testResults.forEach((test, index) => {

const icon = test.status.startsWith('FAILED') ? '❌' : '✅';

const statusText = test.status.startsWith('FAILED') ? test.status.replace('FAILED_', '').padEnd(12) : 'PASSED';

testOutput += `[${icon} ${statusText}] Test Case ${index + 1} (Input: ${test.input})\n`;

if (test.status.startsWith('FAILED')) {

testOutput += ` - Expected Output: ${test.expected || 'N/A'}\n`;

testOutput += ` - Actual Output: ${test.actual}\n\n`;

} else {

testOutput += ` - Actual Output: ${test.actual}\n\n`;

}

});

}

if (isCompilationError) {

title = 'Compilation Error';

message = `The Java compiler failed to build your code. This is typically due to a syntax error, incorrect class/method signature, or missing required classes. The compiler reported an error (see box below). Use the AI explanation for a hint!`;

codeContent = firstFailure.actual;

} else if (isRuntimeError) {

title = 'Runtime Error';

message = `Your code compiled but crashed during execution (e.g., NullPointerException). The runtime reported an error (see box below). Use the AI explanation for a hint!`;

codeContent = firstFailure.actual;

} else if (firstFailure.status === 'FAILED_NETWORK') {

title = 'Network Error';

message = `There was an issue connecting to the compilation service. Please check your internet connection or try again.`;

codeContent = firstFailure.actual;

}

else {

codeContent = testOutput;

}

const actions = document.getElementById('result-modal-actions');

actions.innerHTML = `

<button onclick="restartFromScratch()"

class="bg-red-600 hover:bg-red-700 text-white font-medium py-2 px-4 rounded-xl shadow-md transition-colors

w-full md:flex-grow whitespace-nowrap">

Restart From Scratch

</button>

<button onclick="explainWithAI()"

class="bg-gradient-to-br from-cyan-500 to-indigo-600 hover:from-cyan-600 hover:to-indigo-700

text-white font-medium py-2 px-4 rounded-xl shadow-md transition-colors

w-full md:flex-grow whitespace-nowrap

flex items-center justify-center">

<span class="material-symbols-outlined mr-2 text-lg [font-variation-settings:'FILL'_1]"> auto_awesome</span>

<span class="text-base">Explain with AI</span>

</button>

<button onclick="showHelp()"

class="bg-gray-700/80 hover:bg-gray-600 text-white font-medium py-2 px-4 rounded-xl shadow-md transition-colors

w-full md:flex-grow whitespace-nowrap">

Show Solution

</button>

</div>

showResultModal(title, message, 'error', codeContent);

}

function showResultModal(title, message, type, codeContent) {

const modal = document.getElementById('result-modal');

document.getElementById('result-modal-title').textContent = title;

resultModalMessageEl.innerHTML = convertMarkdownToHtml(message);

const codeEl = document.getElementById('result-modal-code');

document.getElementById('result-modal-content-area').scrollTop = 0;

if (codeContent) {

codeEl.textContent = codeContent;

codeEl.style.display = 'block';

document.getElementById('result-modal-title').classList.remove('text-accent-blue', 'text-green-500', 'text-red-500', 'text-yellow-300');

document.getElementById('result-modal-title').classList.add(type === 'success' ? 'text-green-500' : (type === 'error' ? 'text-red-500' : 'text-yellow-300'));

} else {

codeEl.style.display = 'none';

document.getElementById('result-modal-title').classList.remove('text-accent-blue', 'text-green-500', 'text-red-500', 'text-yellow-300');

document.getElementById('result-modal-title').classList.add(type === 'success' ? 'text-green-500' : (type === 'error' ? 'text-red-500' : 'text-accent-blue'));

}

showModalWithTransition('result-modal', 'result-content');

}

function hideResultModal() {

hideModalWithTransition('result-modal', 'result-content');

}

function restartFromScratch() {

codeFiles.forEach(file => file.content = '');

editor.value = '';

currentFileIndex = 0;

renderFileTabs();

hideResultModal();

}

function showHelp() {

if (currentProblem) {

const message = "Here is the verified solution for the problem. Use this to compare against your attempt.";

const actions = document.getElementById('result-modal-actions');

actions.innerHTML = `

Back to Editor

</button>

showResultModal('Solution Revealed', message, 'help', currentProblem.solution);

}

async function explainWithAI() {

hideResultModal();

showLoadingModal();

if (!lastFailedCode || !currentProblem) {

hideLoadingModal();

showResultModal('Error', 'No failed code found or problem data is missing.', 'error', null);

return;

}

const userQuestion = "Please review my failing code and identify the most critical flaw (e.g., incorrect loop structure, wrong return type, missing keyword, or conceptual mistake) compared to the correct solution. Do NOT provide the correct code or method signature. Guide me towards the fix.";

const problemDescription = `The problem title is: "${currentProblem.title}". The problem requires: ${currentProblem.description}. For your internal comparison, the correct solution is: \n\n\`\`\`java\n${currentProblem.solution}\n\`\`\n`;

let generatedText = "Apologies, the **AI explanation service is currently unavailable**. This may be due to a network connection issue or an error in the service. Please try again later or use the 'Help (Show Solution)' button.";

try {

const payload = {

question: userQuestion,

code: lastFailedCode,

problemDescription: problemDescription

};

const response = await fetch(TUTOR_URL, {

method: 'POST',

headers: { 'Content-Type': 'application/json' },

body: JSON.stringify(payload)

});

if (!response.ok) {

generatedText = `The AI explanation service returned an error (Status: ${response.status}).`;

if (response.status === 403) {

generatedText = "The AI explanation service failed due to a **403 Forbidden Error**. This is usually because a browser security setting (like an extension) is blocking the required authentication process, or the Worker's CORS settings are incorrect.";

}

throw new Error(`Worker API HTTP error! status: ${response.status}`);

}

generatedText = await response.text();

} catch (error) {

console.error("AI explain Fetch Error:", error);

}

hideLoadingModal();

showResultModal(

'Explain with AI',

convertMarkdownToHtml(generatedText),

'help',

null

);

}

function toggleProblemSelector(show = true) {

if (show) {

renderProblemList();

showModalWithTransition('problem-selector-modal', 'problem-selector-content');

} else {

hideModalWithTransition('problem-selector-modal', 'problem-selector-content');

}

function renderProblemList() {

problemListEl.innerHTML = '';

const filteredProblems = problems.filter(p => activeFilters[p.difficulty]);

if (filteredProblems.length === 0) {

problemListEl.innerHTML = '<p class="text-center text-gray-500 p-4">No problems match the current filter. Try selecting more difficulties.</p>';

randomBtnEl.textContent = 'Random Problem (None)';

randomBtnEl.disabled = true;

randomBtnEl.classList.add('opacity-50');

return;

}

filteredProblems.forEach(p => {

const style = getDifficultyStyle(p.difficulty);

const problemItem = document.createElement('div');

problemItem.className = 'p-3 rounded-xl bg-gray-900/50 hover:bg-gray-700/70 transition-colors cursor-pointer flex justify-between items-center';

problemItem.onclick = () => loadProblem(p);

problemItem.innerHTML = `

<span class="font-medium text-white">${p.title}</span>

<span class="px-3 py-1 text-xs rounded-full font-medium ${style.text} ${style.bg}">${p.difficulty}</span>

problemListEl.appendChild(problemItem);

});

randomBtnEl.textContent = `Random Problem (${filteredProblems.length})`;

randomBtnEl.disabled = false;

randomBtnEl.classList.remove('opacity-50');

}

function renderFilters() {

const difficulties = ['Easy', 'Medium', 'Hard'];

filterContainerEl.innerHTML = '';

difficulties.forEach(diff => {

const style = getDifficultyStyle(diff);

const isChecked = activeFilters[diff];

const button = document.createElement('button');

button.textContent = diff;

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