Files
playground/chat.html
T

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HTML

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Cet ci pi ti</title>
<style>
:root {
color-scheme: light dark;
--bg-primary: Canvas;
--bg-secondary: #ccc;
--bg-input: #f0f0f0;
--bg-user-message: Highlight;
--bg-code: Field;
--text-primary: CanvasText;
--text-user: HighlightText;
--border-color: #aaa;
}
@media (prefers-color-scheme: dark) {
:root {
--bg-secondary: #555;
--bg-input: #444;
}
}
*,
*::before,
*::after {
box-sizing: border-box;
font-family: inherit;
}
body {
margin: 0;
/* font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; */
font-family: "JetBrains Mono", Consolas, Menlo, monospace;
line-height: 1.6;
font-size: 14px;
/* color: var(--text-primary); */
}
a {
color: var(--text-user);
text-decoration: none;
}
.chat-container {
height: 100vh;
display: grid;
grid-template-columns: 1fr min-content;
grid-template-rows: 1fr min-content;
gap: 1rem;
padding: 1rem;
grid-template-areas:
"messages messages"
"prompt submit";
}
.messages {
grid-area: messages;
overflow-y: auto;
padding-right: 0.5rem;
}
.message {
padding: 0.8rem 1.2rem;
border-radius: 0.8rem;
max-width: 85%;
}
textarea,
button {
font-size: inherit;
font-family: inherit;
appearance: none;
}
.button {
text-transform: uppercase;
letter-spacing: 0.05em;
}
.message + .message {
margin-top: 1rem;
}
.user-message {
color: var(--text-user);
background: var(--bg-user-message);
margin-left: auto;
white-space: pre-wrap;
}
.system-message {
background: var(--bg-secondary);
margin-right: auto;
}
.system-message pre,
.system-message code:not(pre code) {
font-family: menlo, consolas, monospace;
background: var(--bg-code);
border-radius: 0.4rem;
}
.system-message pre {
position: relative;
padding: 0.5rem 2.5rem 0.5rem 0.5rem;
white-space: pre;
overflow-x: auto;
}
.copy-btn {
position: absolute;
top: 0.4rem;
right: 0.6rem;
background: var(--bg-secondary);
color: var(--text-primary);
border: none;
border-radius: 0.3rem;
padding: 0.2rem 0.6rem;
font-size: 0.9em;
cursor: pointer;
opacity: 0.6;
transition: opacity 0.2s;
z-index: 2;
}
.copy-btn:hover {
opacity: 1;
}
.system-message code {
padding: 2px 4px;
}
.prompt {
grid-area: prompt;
min-height: 40px;
padding: 0.8rem;
border: none;
border-radius: 0.4rem;
/* background: var(--bg-input); */
/* color: var(--text-primary); */
resize: vertical;
}
.submit {
grid-area: submit;
cursor: pointer;
padding: 0.8rem 2rem;
background: var(--bg-secondary);
/* color: var(--text-primary); */
border: none;
border-radius: 0.4rem;
transition: background-color 0.2s ease;
}
.submit:hover {
background: var(--bg-user-message);
}
/* Scrollbar styling */
.messages::-webkit-scrollbar {
width: 4px;
}
.messages::-webkit-scrollbar-track {
background: var(--bg-primary);
}
.messages::-webkit-scrollbar-thumb {
background: var(--border-color);
border-radius: 4px;
}
/* Focus styles */
.prompt:focus,
.submit:focus {
outline: none;
border-color: var(--bg-user-message);
}
.submit {
anchor-name: --submit;
}
@keyframes pulse {
20% {
opacity: 0.8;
}
}
.submit.busy {
animation: both pulse 1s;
}
#model-selector {
user-select: none;
position: absolute;
top: 1rem;
left: 1rem;
opacity: 0.3;
padding: 0.5rem;
}
#model-selector:is(:hover, [open]) {
opacity: 1;
}
/* History panel (mirrors model selector behavior) */
#history-panel {
position: absolute;
user-select: none;
top: 1rem;
right: 1rem;
opacity: 0.3;
padding: 0.5rem;
}
#history-panel:is(:hover, [open]) {
opacity: 1;
}
#history-panel summary {
font-weight: bold;
}
.history-item {
cursor: pointer;
padding: 0.25rem 0.2rem;
border-radius: 0.2rem;
display: flex;
gap: 0.5rem;
align-items: center;
}
.history-item:hover {
background: rgba(0, 0, 0, 0.05);
}
/* History list classes */
.history-list {
min-width: 220px;
max-width: 320px;
padding-top: 0.5rem;
}
.history-none {
opacity: 0.7;
}
.history-time {
font-weight: 700;
}
.history-time::after {
content: " - ";
}
.history-excerpt {
/* margin-left: 6px; */
/* display: inline-block; */
max-width: 220px;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
vertical-align: middle;
}
#model-selector summary {
font-weight: bold;
}
.model-opt__label {
display: block;
}
details {
cursor: pointer;
}
blockquote {
padding: 1rem;
margin: 1rem 0;
background-color: rgba(0, 0, 0, 0.1);
border-left: 3px solid dodgerblue;
}
blockquote > p + p {
margin: 1em 0 0 0;
}
blockquote > p:only-child {
margin: 0;
}
ul {
padding-left: 1rem;
}
td {
vertical-align: top;
}
th {
vertical-align: top;
}
tr:nth-child(odd) {
background-color: rgba(0, 0, 0, 0.05);
}
</style>
</head>
<body>
<div id="app">
<div class="chat-container">
<div id="messages" class="messages"></div>
<textarea rows="6" id="prompt" class="prompt" placeholder="Type your message..."></textarea>
<button id="submit" class="submit button">Send</button>
<details id="model-selector">
<summary>Model</summary>
</details>
</div>
</div>
<script type="module">
import * as smd from "https://cdn.jsdelivr.net/npm/streaming-markdown@latest/smd.min.js";
window.env ??= {};
const models = [
{ name: "gpt-4.1", chat: chatWithOpenAI },
{ name: "gpt-4.1-mini", chat: chatWithOpenAI },
{ name: "gemini-3-flash-preview", chat: chatWithGemini },
{ name: "claude-haiku-4-5-20251001", chat: chatWithClaude },
];
window.env.MODEL ||= "gemini-3-flash-preview";
const systemPrompt = `You are a helpful AI assistant.
Do not preach about implications,
do not praise excessively.
Keep a critical mindset,
do not assume blindly.
Answer in valid markdown.`;
const messages = [
{
role: "system",
content: systemPrompt,
},
];
const $messages = document.querySelector("#messages");
const $prompt = document.querySelector("#prompt");
const $submit = document.querySelector("#submit");
const $modelSelector = document.querySelector("#model-selector");
const $historyPanel = (function createHistoryPanel() {
const details = document.createElement("details");
details.id = "history-panel";
details.innerHTML = `<summary>History</summary>`;
return details;
})();
// insert history panel next to model selector
$modelSelector.parentNode.appendChild($historyPanel);
// grow the prompt textarea as needed
const minRows = +$prompt.rows;
const maxRows = 10;
$prompt.addEventListener(
"input",
debounce((e) => {
const lines = e.target.value.split("\n").length;
e.target.rows = Math.min(maxRows, Math.max(minRows, lines));
}, 100)
);
// populate model selector
$modelSelector.append(
...models.map((model) => {
const $label = document.createElement("label");
$label.className = "model-opt__label";
const $input = document.createElement("input");
$input.type = "radio";
$input.name = "model";
$input.value = model.name;
$label.append($input, model.name);
return $label;
})
);
$modelSelector.addEventListener("mouseenter", (e) => {
const open = $modelSelector.hasAttribute("open");
if (!open) {
$modelSelector.setAttribute("open", "");
}
});
document.querySelectorAll("[name=model]").forEach(($option) => {
if ($option.value === window.env.MODEL) {
$option.checked = true;
}
});
/** @type {AbortController} */
let abortController = null;
$submit.addEventListener("click", () => {
if (abortController) {
abortController.abort();
} else {
handleSubmit();
}
});
$prompt.addEventListener("keydown", (e) => {
if (e.key === "Enter" && (e.ctrlKey || e.metaKey)) {
e.preventDefault();
if (!abortController) {
handleSubmit();
}
}
});
const injectedPrompt = window.env.PROMPT?.trim() ?? "";
if (injectedPrompt) {
$prompt.value = injectedPrompt + "\n\n";
}
$prompt.focus();
const STORAGE_KEY = "chat_conversations";
function todayKey(date = new Date()) {
return date.toISOString().slice(0, 10); // YYYY-MM-DD
}
function loadConversations() {
try {
const raw = localStorage.getItem(STORAGE_KEY);
if (!raw) return {};
return JSON.parse(raw);
} catch (e) {
console.error("Failed to load conversations", e);
return {};
}
}
function saveConversations(obj) {
try {
localStorage.setItem(STORAGE_KEY, JSON.stringify(obj));
} catch (e) {
console.error("Failed to save conversations", e);
}
}
function clearOldConversations() {
const all = loadConversations();
const today = todayKey();
Object.keys(all).forEach((k) => {
if (k !== today) delete all[k];
});
saveConversations(all);
}
function saveConversationNow(messages) {
// messages: array of {role, content}
const all = loadConversations();
const today = todayKey();
all[today] ||= [];
const ts = new Date();
const entry = { time: ts.toISOString(), messages };
all[today].unshift(entry);
// keep only last 5
if (all[today].length > 5) all[today] = all[today].slice(0, 5);
saveConversations(all);
renderHistoryList();
}
function formatTime(iso) {
const d = new Date(iso);
return d.toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" });
}
function renderHistoryList() {
// remove existing list
const today = todayKey();
const all = loadConversations();
const $list = document.createElement("div");
$list.className = "history-list";
const items = (all[today] || []).slice(0, 5);
if (items.length === 0) {
const $none = document.createElement("div");
$none.textContent = "No recent conversations today";
$none.className = "history-none";
$list.appendChild($none);
} else {
items.forEach((entry, idx) => {
const firstUser = entry.messages.find((m) => m.role === "user")?.content || "";
const preview = firstUser.trim().replace(/\n/g, " ").slice(0, 30);
const $line = document.createElement("div");
$line.className = "history-item";
$line.dataset.idx = idx;
const $timeSpan = document.createElement("span");
$timeSpan.className = "history-time";
$timeSpan.textContent = formatTime(entry.time);
const $previewSpan = document.createElement("span");
$previewSpan.className = "history-excerpt";
$previewSpan.innerText = preview;
$line.appendChild($timeSpan);
$line.appendChild($previewSpan);
$line.addEventListener("click", () => {
restoreConversation(entry.messages);
$historyPanel.removeAttribute("open");
});
$list.appendChild($line);
});
}
// clear previous children and append
$historyPanel.querySelectorAll(".history-list").forEach((n) => n.remove());
const wrapper = document.createElement("div");
wrapper.className = "history-list";
wrapper.appendChild($list);
$historyPanel.appendChild(wrapper);
}
function escapeHtml(str) {
return str.replace(/[&<>"']/g, function (m) {
return {
"&": "&amp;",
"<": "&lt;",
">": "&gt;",
'"': "&quot;",
"'": "&#39;",
}[m];
});
}
function restoreConversation(messagesArr) {
// Clear current messages UI and re-populate
messages.length = 0; // clear array
// push system prompt back if exists
messagesArr.forEach((m) => messages.push(m));
// re-render messages UI
$messages.innerHTML = "";
messages
.filter((m) => m.role !== "system")
.forEach((m) => {
const el = createMessageElement(m.content, m.role === "user");
if (!(m.role === "user")) {
el.innerHTML = renderMarkdown(m.content);
}
$messages.appendChild(el);
});
scrollToBottom($messages);
}
// initialize
clearOldConversations();
renderHistoryList();
async function handleSubmit() {
const prompt = $prompt.value.trim();
if (!prompt) return;
$modelSelector.removeAttribute("open");
// Add user message
const $userMessage = createMessageElement(prompt, true);
$messages.appendChild($userMessage);
messages.push({ role: "user", content: prompt });
// Prepare for system response
const $systemMessage = createMessageElement("", false);
$messages.appendChild($systemMessage);
const md = new StreamingMarkdown($systemMessage);
let fullResponse = "";
$prompt.value = "";
scrollToBottom($messages);
abortController = new AbortController();
const pickedModel = document.querySelector("[name=model]:checked")?.value;
const chat = models.find((m) => m.name === pickedModel)?.chat;
if (!chat) {
console.error(`Unknown model: ${window.env.MODEL}`);
return;
}
$submit.textContent = "Cancel";
$submit.classList.add("busy");
try {
await chat({
model: pickedModel,
onContent: (content) => {
fullResponse += content;
md.append(content);
scrollToBottom($messages);
},
onError(e) {
md.append("ERROR:```\n" + e.message + "\n```");
},
messages,
signal: abortController.signal,
});
if (fullResponse.trim() !== "") {
messages.push({ role: "assistant", content: fullResponse });
}
} catch (err) {
if (err.name === "AbortError") {
md.append("\n\n[Cancelled]");
} else {
md.append("\n\n[Error: " + err.message + "]");
}
} finally {
md.finish();
// Save conversation after assistant finishes responding
try {
// clone messages to avoid mutation issues
const clone = messages.map((m) => ({ role: m.role, content: m.content }));
saveConversationNow(clone);
} catch (e) {
console.error("Failed to save conversation", e);
}
$submit.textContent = "Send";
$submit.classList.remove("busy");
abortController = null;
}
}
function createMessageElement(content, isUser) {
const $el = document.createElement("div");
$el.className = `message ${isUser ? "user-message" : "system-message"}`;
$el.innerText = content;
// if (isUser) {
// } else {
// // For system messages we create a pre element so streaming markdown can render into it
// const $pre = document.createElement("pre");
// $pre.textContent = content;
// $el.appendChild($pre);
// }
return $el;
}
// Auto scroll functionality
let userHasScrolledUp = false;
// Function to check if user is at the bottom
function isAtBottom($el) {
const threshold = 50; // Allow some tolerance (50px from bottom)
return $el.scrollHeight - $el.clientHeight - $el.scrollTop <= threshold;
}
const scrollToBottom = throttle(($el) => {
if (!userHasScrolledUp) {
$el.scrollTop = $el.scrollHeight;
}
}, 500);
$messages.addEventListener("scroll", () => {
userHasScrolledUp = !isAtBottom($messages);
});
/**
* @typedef {{
* onContent: (content: string) => Promise<void>,
* messages: Array<{ role: string, content: string }>,
* extraHeaders: Record<string, string>,
* signal: AbortSignal,
* apiKey: string,
* model: string,
* [key: string]: any
* }} ChatArgs
*/
/** @param {ChatArgs} args - The arguments for the chatWithClaude function. */
async function chatWithOpenAI({
baseUrl = "https://api.openai.com/v1",
onContent,
onError,
messages,
signal,
apiKey = window.env.OPENAI_API_KEY,
model,
extraHeaders = {},
...rest
}) {
const response = await fetch(`${baseUrl}/chat/completions`, {
method: "POST",
headers: {
"Content-Type": "application/json",
Authorization: `Bearer ${apiKey}`,
...extraHeaders,
},
body: JSON.stringify({
model,
messages,
stream: true,
...rest,
}),
signal,
});
if (!response.ok) {
const text = await response.text();
await onError?.(new Error(`HTTP ${response.status}:\n${text.trim()}`));
return;
}
const reader = response.body.getReader();
const decoder = new TextDecoder();
while (true) {
const { done, value } = await reader.read();
if (done) break;
const text = decoder.decode(value, { stream: true });
const lines = text
.split("\n\n")
.filter((line) => !!line.trim())
.map((line) => line.trim().replace("data: ", ""));
for (const line of lines) {
if (line === "[DONE]") return;
try {
const parsed = JSON.parse(line);
const content = parsed.choices[0].delta.content;
if (content) {
await onContent(content);
}
} catch (e) {}
}
}
}
/*** @param {ChatArgs} args - The arguments for the chatWithClaude function. */
async function chatWithClaude(args) {
return chatWithOpenAI({
...args,
baseUrl: "https://api.anthropic.com/v1",
extraHeaders: {
"x-api-key": args.apiKey,
"anthropic-version": "2023-06-01",
"anthropic-dangerous-direct-browser-access": "true",
},
apiKey: window.env.ANTHROPIC_API_KEY,
});
}
/*** @param {ChatArgs} args - The arguments for the chatWithGemini function. */
/**
* Native Gemini Implementation
* @param {ChatArgs} args
*/
async function chatWithGemini({ onContent, onError, messages, signal, apiKey = window.env.GEMINI_API_KEY, model = "gemini-3-flash-preview", ...rest }) {
// Convert OpenAI message format to Gemini format
const contents = messages.map((msg) => ({
role: msg.role === "assistant" ? "model" : "user",
parts: [{ text: msg.content }],
}));
try {
const response = await fetch(`https://generativelanguage.googleapis.com/v1beta/models/${model}:streamGenerateContent?key=${apiKey}`, {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify({
contents,
generationConfig: {
thinkingConfig: {
thinkingLevel: "low",
},
...rest,
},
}),
signal,
});
if (!response.ok) {
const text = await response.text();
await onError?.(new Error(`Gemini API Error ${response.status}: ${text}`));
return;
}
const reader = response.body.getReader();
const decoder = new TextDecoder();
let buffer = "";
while (true) {
const { done, value } = await reader.read();
if (done) break;
buffer += decoder.decode(value, { stream: true });
// Gemini's native stream returns a JSON array of objects.
// In a streaming context, it looks like: [ { ... }, { ... } ]
// We need to strip the brackets and commas or parse the chunks.
// Note: This is a simplified parser for the typical Gemini stream format
// which arrives as an array of JSON objects.
let startIdx;
while ((startIdx = buffer.indexOf("{")) !== -1) {
let endIdx = -1;
let depth = 0;
// Find the matching closing bracket
for (let i = startIdx; i < buffer.length; i++) {
if (buffer[i] === "{") depth++;
else if (buffer[i] === "}") depth--;
if (depth === 0) {
endIdx = i;
break;
}
}
if (endIdx === -1) break; // Incomplete JSON object
const jsonStr = buffer.substring(startIdx, endIdx + 1);
buffer = buffer.substring(endIdx + 1);
try {
const parsed = JSON.parse(jsonStr);
const content = parsed.candidates?.[0]?.content?.parts?.[0]?.text;
if (content) {
await onContent(content);
}
} catch (e) {
console.error("Error parsing Gemini chunk", e);
}
}
}
} catch (err) {
if (err.name !== "AbortError") {
await onError?.(err);
}
}
}
function renderMarkdown(markdown) {
const $container = document.createElement("div");
const renderer = smd.default_renderer($container);
const parser = smd.parser(renderer);
smd.parser_write(parser, markdown);
smd.parser_end(parser);
return $container.innerHTML;
}
class StreamingMarkdown {
constructor($el) {
this.$el = $el;
this.renderer = smd.default_renderer($el);
this.parser = smd.parser(this.renderer);
}
append(markdown) {
smd.parser_write(this.parser, markdown);
// Add copy buttons after rendering new markdown
addCopyButtonsToCodeBlocks(this.$el);
}
finish() {
smd.parser_end(this.parser);
addCopyButtonsToCodeBlocks(this.$el);
}
}
/**
* Creates a debounced function that delays execution
* @param {Function} func - Function to debounce
* @param {number} delay - Delay in milliseconds
* @returns {Function} Debounced function
*/
function debounce(func, delay) {
let timeoutId;
return function debounced(...args) {
clearTimeout(timeoutId);
timeoutId = setTimeout(() => func.apply(this, args), delay);
};
}
/**
* Creates a throttled function that limits execution frequency
* @param {Function} func - Function to throttle
* @param {number} limit - Minimum time between calls in milliseconds
* @returns {Function} Throttled function
*/
function throttle(func, limit) {
let inThrottle;
return function throttled(...args) {
if (!inThrottle) {
func.apply(this, args);
inThrottle = true;
setTimeout(() => (inThrottle = false), limit);
}
};
}
// Add copy-to-clipboard buttons to code blocks in system messages
function addCopyButtonsToCodeBlocks($container) {
// Only add to <pre><code>...</code></pre> blocks
$container.querySelectorAll("pre").forEach(($pre) => {
// Avoid duplicate buttons
if ($pre.querySelector(".copy-btn")) return;
const $code = $pre.querySelector("code");
if (!$code) return;
const $btn = document.createElement("button");
$btn.className = "copy-btn";
$btn.type = "button";
$btn.textContent = "Copy";
$btn.addEventListener("click", (e) => {
try {
const $textArea = document.createElement("textarea");
$textArea.value = $code.innerText;
document.body.appendChild($textArea);
$textArea.select();
document.execCommand("copy");
document.body.removeChild($textArea);
$btn.textContent = "Copied!";
setTimeout(() => ($btn.textContent = "Copy"), 1200);
} catch {
$btn.textContent = "Failed";
setTimeout(() => ($btn.textContent = "Copy"), 1200);
}
});
$pre.appendChild($btn);
});
}
</script>
</body>
</html>