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// MCP Apps (extension `io.modelcontextprotocol/ui`, spec 2026-01-26) — the
// interactive app shell for the `get_forecast_predictions` tool: WorldMonitor's
// AI-generated geopolitical/economic forecasts as probability cards (title,
// domain + region, probability bar). Built on the shared shell foundation.
//
// Tool result shape (cache tool — content[0].text JSON, freshness envelope).
// The tool serves the raw `forecast:predictions:v2` cache value under label
// `predictions`; items carry `probability` as a 0-1 fraction (see
// src/components/ForecastPanel.ts):
//   { cached_at, stale, data: {
//       predictions: { predictions: [{ title, domain, region, probability }] } } }
// probability is nullable (render "—" and hide the bar when absent). This widget
// renders forecast titles and probabilities ONLY — no calibration / Brier /
// scorecard claims (that is the get_forecast_scorecard tool's domain, guarded
// elsewhere).
//
// textContent-only rendering; renderBody stays backtick/`${`/regex-free.

import { buildAppHtml } from './shell';

const STYLES = `
  .fc { padding: 8px 0; border-bottom: 1px solid var(--border); }
  .fc:last-child { border-bottom: none; }
  .fc-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
  .fc-title { font-size: 13px; color: var(--fg); min-width: 0; }
  .fc-prob { font-variant-numeric: tabular-nums; font-weight: 700; font-size: 13px; white-space: nowrap; }
  .fc-meta { margin-top: 3px; display: flex; gap: 6px; flex-wrap: wrap; }
  .chip { font-size: 10px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted);
    border: 1px solid var(--border); border-radius: 999px; padding: 1px 7px; }
`;

const BODY = `
  <div class="head">
    <div class="title">Forecasts</div>
    <div class="badge">WorldMonitor Forecasts</div>
  </div>
  <div class="empty" id="empty">Waiting for forecasts…</div>
  <div id="card" style="display:none">
    <div id="list"></div>
    <div class="foot" id="foot"></div>
  </div>
`;

const RENDER = `
    if (!data || typeof data !== "object") return;
    var d = data.data && typeof data.data === "object" ? data.data : data;
    q("empty").style.display = "none";
    q("card").style.display = "block";

    var node = d.predictions && typeof d.predictions === "object" ? d.predictions : null;
    var preds = listState(node && node.predictions).items;
    var host = q("list");
    host.textContent = "";
    for (var i = 0; i < preds.length && i < 12; i++) {
      var p = preds[i];
      if (!p || typeof p !== "object") continue;
      var fc = el("div", "fc");
      var head = el("div", "fc-head");
      head.appendChild(el("span", "fc-title", collapseWs(p.title) || "Forecast"));
      var pr = num(p.probability);
      var pct = pr == null ? null : (pr <= 1 ? pr * 100 : pr);
      head.appendChild(el("span", "fc-prob", pct == null ? "—" : Math.round(pct) + "%"));
      fc.appendChild(head);
      var meta = el("div", "fc-meta");
      var dom = collapseWs(p.domain);
      if (dom) meta.appendChild(el("span", "chip", dom));
      var reg = collapseWs(p.region);
      if (reg) meta.appendChild(el("span", "chip", reg));
      if (meta.childNodes.length) fc.appendChild(meta);
      var bar = probabilityBar(pct);
      if (bar) fc.appendChild(bar);
      host.appendChild(fc);
    }
    if (!host.childNodes.length) host.appendChild(el("div", "empty", "No forecasts available."));

    q("foot").textContent = data.cached_at
      ? "Snapshot: " + collapseWs(data.cached_at) + (data.stale ? " (stale)" : "")
      : "";
`;

export const FORECASTS_APP_HTML = buildAppHtml({
  title: 'Forecasts — WorldMonitor',
  appName: 'worldmonitor-forecasts',
  styles: STYLES,
  body: BODY,
  renderBody: RENDER,
});