import { html, nothing } from 'lit';
import { unsafeHTML } from 'lit/directives/unsafe-html.js';
import { LightElement } from '../lib/base.js';
import { t } from '../lib/i18n.js';
import { setSlice, clearSlice } from '../lib/view-context.js';
const PAGE_ID = 'session';
/// The view-context slice this page owns (see `lib/view-context.js`).
const VIEW_SLICE = 'entity@session';
function formatDate(iso) {
if (!iso) return '—';
return new Date(iso).toLocaleString(undefined, {
day: '2-digit', month: '2-digit', year: '2-digit',
hour: '2-digit', minute: '2-digit', second: '2-digit',
});
}
function formatTime(iso) {
if (!iso) return null;
return new Date(iso).toLocaleTimeString('en-GB', {
hour: '2-digit', minute: '2-digit', second: '2-digit',
});
}
function sourceBadgeClass(source) {
const map = { 'event-triage': 'bg-warning text-dark', cron: 'bg-info text-dark', web: 'bg-primary', telegram: 'bg-success', mobile: 'bg-secondary' };
return map[source] ?? 'bg-secondary';
}
function jsonPretty(val) {
if (val == null) return '—';
if (typeof val === 'string') return val;
return JSON.stringify(val, null, 2);
}
export class SessionDetailPage extends LightElement {
static properties = {
_open: { state: true },
_sessionId: { state: true },
_data: { state: true },
_loading: { state: true },
_error: { state: true },
_live: { state: true },
_expandedTools: { state: true },
_expandedReasons: { state: true },
};
constructor() {
super();
this._open = false;
this._sessionId = null;
this._data = null;
this._loading = false;
this._error = null;
this._live = false;
this._expandedTools = new Set();
this._expandedReasons = new Set();
this._ws = null;
this._wsReconnectTimer = null;
}
connectedCallback() {
super.connectedCallback();
this.__onLocaleChanged = () => this.requestUpdate();
this.__onPageChange = (e) => {
this._open = e.detail.page === PAGE_ID;
this.style.display = this._open ? 'flex' : 'none';
if (this._open) this._loadFromHash();
else { this._closeWs(); clearSlice(VIEW_SLICE); }
};
this.__onHashChange = () => {
if (this._open) this._loadFromHash();
};
window.addEventListener('locale-changed', this.__onLocaleChanged);
window.addEventListener('llm-page-change', this.__onPageChange);
window.addEventListener('hashchange', this.__onHashChange);
}
disconnectedCallback() {
window.removeEventListener('locale-changed', this.__onLocaleChanged);
window.removeEventListener('llm-page-change', this.__onPageChange);
window.removeEventListener('hashchange', this.__onHashChange);
this._closeWs();
clearSlice(VIEW_SLICE);
super.disconnectedCallback();
}
_idFromHash() {
const parts = location.hash.replace('#', '').split('/');
if (parts[0] === PAGE_ID && parts[1]) return parseInt(parts[1], 10);
return null;
}
_loadFromHash() {
const id = this._idFromHash();
if (id == null) { clearSlice(VIEW_SLICE); return; }
// The entity slice: which conversation is open. Published before the fetch
// — a message sent while the transcript loads is still about this session.
setSlice(VIEW_SLICE, [{ label: 'Open conversation', value: `#${id}` }]);
// Reload on the same id too when the socket is down: leaving the page closes
// it, so coming back to the session we already hold would otherwise show a
// frozen snapshot with nothing streaming into it.
if (id === this._sessionId && this._ws) return;
this._sessionId = id;
this._closeWs();
this._fetch(id);
}
async _fetch(id) {
this._loading = true;
this._error = null;
this._data = null;
this._expandedTools = new Set();
this._expandedReasons = new Set();
try {
this._data = await this._fetchDetail(id);
this._connectWs(id);
} catch (e) {
this._error = e.message;
} finally {
this._loading = false;
}
}
// Re-read the transcript without disturbing the view (no spinner, no
// collapsing of what the user opened). The bus has no replay, so every event
// broadcast while the socket was down is lost — a resync is the only repair.
async _resync(id) {
try {
const data = await this._fetchDetail(id);
if (this._sessionId === id) this._data = data;
} catch { /* the socket is up; the next event or resync will catch up */ }
}
async _fetchDetail(id) {
const res = await fetch(`/api/sessions/${id}`);
if (!res.ok) throw new Error(`HTTP ${res.status}`);
return res.json();
}
// ── Live WebSocket ─────────────────────────────────────────────────────────
_connectWs(id, resync = false) {
this._closeWs();
const proto = location.protocol === 'https:' ? 'wss' : 'ws';
const ws = new WebSocket(`${proto}://${location.host}/api/ws/session/${id}`);
this._ws = ws;
ws.onopen = () => {
this._live = true;
// A reconnect means events were missed while we were away.
if (resync) this._resync(id);
};
ws.onmessage = (e) => {
try { this._handleEvent(JSON.parse(e.data)); } catch {}
};
ws.onclose = () => {
this._live = false;
this._ws = null;
// Reconnect after 3 s if the page is still open and showing this session.
if (this._open && this._sessionId === id) {
this._wsReconnectTimer = setTimeout(() => this._connectWs(id, true), 3000);
}
};
ws.onerror = () => ws.close();
}
_closeWs() {
clearTimeout(this._wsReconnectTimer);
if (this._ws) { this._ws.onclose = null; this._ws.close(); this._ws = null; }
this._live = false;
}
// True when the transcript is scrolled to (or near) its end — the only case
// in which a new event should pull the view along.
_atBottom() {
const box = this.querySelector('.sd-container');
if (!box) return true;
return box.scrollHeight - box.scrollTop - box.clientHeight < 120;
}
_scrollToBottom() {
this.updateComplete.then(() => {
const box = this.querySelector('.sd-container');
if (box) box.scrollTop = box.scrollHeight;
});
}
_handleEvent(ev) {
if (!this._data) return;
const msgs = [...this._data.messages];
const now = new Date().toISOString();
const stick = this._atBottom();
switch (ev.type) {
case 'tool_start':
msgs.push({
kind: 'tool',
tool_call_id: ev.tool_call_id,
message_id: ev.message_id,
name: ev.name,
label_short: ev.label_short,
label_full: ev.label_full,
arguments: ev.arguments,
result: null,
error: null,
status: 'pending',
created_at: now,
});
break;
case 'tool_done': {
const i = msgs.findIndex(m => m.kind === 'tool' && m.tool_call_id === ev.tool_call_id);
if (i >= 0) msgs[i] = { ...msgs[i], result: ev.result, status: 'done' };
break;
}
case 'tool_error': {
const i = msgs.findIndex(m => m.kind === 'tool' && m.tool_call_id === ev.tool_call_id);
if (i >= 0) msgs[i] = { ...msgs[i], error: ev.error, status: 'error' };
break;
}
// Terminal but not failures. Without these a stopped or denied call stays
// on "pending" until the page is reloaded.
case 'tool_cancelled': {
const i = msgs.findIndex(m => m.kind === 'tool' && m.tool_call_id === ev.tool_call_id);
if (i >= 0) msgs[i] = { ...msgs[i], status: 'cancelled' };
break;
}
case 'tool_rejected': {
const i = msgs.findIndex(m => m.kind === 'tool' && m.tool_call_id === ev.tool_call_id);
if (i >= 0) msgs[i] = { ...msgs[i], error: ev.reason, status: 'rejected' };
break;
}
case 'thinking':
msgs.push({
kind: 'thinking',
message_id: ev.message_id,
content: ev.content,
reasoning: '',
input_tokens: ev.input_tokens ?? null,
output_tokens: ev.output_tokens ?? null,
created_at: now,
});
break;
case 'done':
msgs.push({
kind: 'assistant',
message_id: ev.message_id,
content: ev.content,
reasoning: '',
input_tokens: ev.input_tokens ?? null,
output_tokens: ev.output_tokens ?? null,
created_at: now,
});
break;
case 'user_message':
msgs.push({
kind: 'user',
content: ev.content,
is_synthetic: false,
created_at: now,
});
break;
case 'agent_start':
msgs.push({
kind: 'agent',
agent_id: ev.agent_id,
depth: ev.depth,
});
break;
case 'agent_done':
msgs.push({
kind: 'agent_end',
agent_id: ev.agent_id,
});
break;
default:
return; // ignore unknown events
}
this._data = { ...this._data, messages: msgs };
if (stick) this._scrollToBottom();
}
_toggleTool(id) {
const next = new Set(this._expandedTools);
next.has(id) ? next.delete(id) : next.add(id);
this._expandedTools = next;
}
_toggleReason(id) {
const next = new Set(this._expandedReasons);
next.has(id) ? next.delete(id) : next.add(id);
this._expandedReasons = next;
}
// ── Renderers ─────────────────────────────────────────────────────────────────
_back() {
history.back();
}
_renderSessionHeader(session) {
return html`
`;
}
_renderUserMsg(item, idx) {
const time = formatTime(item.created_at);
return html`
${item.is_synthetic
? html`${t('session.synthetic')}`
: nothing}
${t('session.user_role')}
${time ? html`${time}` : nothing}
${item.content}
${item.failed ? html`
${t('session.failed')}
` : nothing}
`;
}
_renderAssistantMsg(item, idx) {
const key = `ast-${idx}`;
const hasReasoning = item.reasoning && item.reasoning.trim().length > 0;
const expanded = this._expandedReasons.has(key);
const time = formatTime(item.created_at);
return html`
${t('session.assistant_role')}
${time ? html`${time}` : nothing}
${item.input_tokens != null ? html`${item.input_tokens}↑ ${item.output_tokens}↓` : nothing}
${hasReasoning ? html`
this._toggleReason(key)}>
${t('session.reasoning_label')}
${expanded ? html`
${item.reasoning}` : nothing}
` : nothing}
${item.content ? html`
${item.content}
` : nothing}
`;
}
_renderThinkingMsg(item, idx) {
const key = `think-${item.message_id ?? idx}`;
const hasReasoning = item.reasoning && item.reasoning.trim().length > 0;
const expanded = this._expandedReasons.has(key);
const time = formatTime(item.created_at);
return html`
${t('session.thinking_role')}
${time ? html`${time}` : nothing}
${item.input_tokens != null ? html`${item.input_tokens}↑ ${item.output_tokens}↓` : nothing}
${hasReasoning ? html`
this._toggleReason(key)}>
${t('session.reasoning_label')}
${expanded ? html`
${item.reasoning}` : nothing}
` : nothing}
${item.content ? html`
${item.content}
` : nothing}
`;
}
_renderToolMsg(item, idx) {
const key = item.tool_call_id ?? idx;
const expanded = this._expandedTools.has(key);
const statusClass = {
done: 'sd-tool--done',
error: 'sd-tool--error',
pending: 'sd-tool--pending',
cancelled: 'sd-tool--stopped',
rejected: 'sd-tool--stopped',
}[item.status] ?? '';
return html`
`;
}
_renderAgentFrame(item) {
return html`
${t('session.sub_agent')} ${item.agent_id}
${t('session.depth', { n: item.depth })}
`;
}
_renderAgentFrameEnd(item) {
return html`${t('session.end_of')} ${item.agent_id}
`;
}
_renderMessage(item, idx) {
switch (item.kind) {
case 'user': return this._renderUserMsg(item, idx);
case 'assistant': return this._renderAssistantMsg(item, idx);
case 'thinking': return this._renderThinkingMsg(item, idx);
case 'tool': return this._renderToolMsg(item, idx);
case 'agent': return this._renderAgentFrame(item);
case 'agent_end': return this._renderAgentFrameEnd(item);
default: return nothing;
}
}
render() {
return html`
${this._loading ? html`
` : this._error ? html`
${this._error}
` : !this._data ? html`
${t('session.no_session')}
${unsafeHTML(t('session.no_session_hint'))}
` : html`
${this._renderSessionHeader(this._data.session)}
${this._data.messages.length === 0
? html`
${t('session.empty')}
`
: this._data.messages.map((m, i) => this._renderMessage(m, i))
}
`}