// shared helpers + global chrome (stats bar) used by every admin page.
// each page-specific script depends on this loading first.

const PAGE = 50;


const api = (path, opts) => fetch(path, opts).then(r => {
  if (!r.ok) throw new Error(r.status);
  return r.json();
});


function toast(msg, err) {
  const el = document.getElementById("toast");
  if (!el) return;
  document.getElementById("toast-msg").textContent = msg;
  el.className = "show" + (err ? " error" : "");
  clearTimeout(toast._t);
  toast._t = setTimeout(() => el.className = "", 2500);
}


function badgeHtml(status) {
  const s = status || "null";
  const cls = s === "ok" ? "ok" : s === "error" ? "err" : s === "pending" ? "pending" : "null";
  return `<span class="badge ${cls}">${s}</span>`;
}


function escapeHtml(s) {
  return String(s ?? "").replace(/[&<>"']/g, c => ({
    "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;"
  }[c]));
}


function formatNumber(value, compact = false) {
  const number = Number(value || 0);
  return new Intl.NumberFormat("en-GB", compact ? { notation: "compact", maximumFractionDigits: 1 } : {}).format(number);
}


function formatPercent(value, digits = 1) {
  if (value == null || !Number.isFinite(Number(value))) return "—";
  return `${(Number(value) * 100).toFixed(digits)}%`;
}


function formatRelative(value) {
  if (!value) return "—";
  const timestamp = new Date(value.endsWith && value.endsWith("Z") ? value : `${value}Z`).getTime();
  if (!Number.isFinite(timestamp)) return value;
  const seconds = Math.round((timestamp - Date.now()) / 1000);
  const units = [[86400, "day"], [3600, "hour"], [60, "minute"]];
  const formatter = new Intl.RelativeTimeFormat("en", { numeric: "auto" });
  for (const [size, name] of units) {
    if (Math.abs(seconds) >= size) return formatter.format(Math.round(seconds / size), name);
  }
  return "just now";
}


function installChrome() {
  const header = document.querySelector("header.app-header");
  if (!header) return;
  const title = header.querySelector("h1");
  if (title) title.innerHTML = `<span class="brand-mark">D</span><span class="brand-copy">Duriin<span>Autonomous intelligence</span></span>`;

  const nav = header.querySelector(".tabs");
  if (nav && !nav.querySelector('[href="/admin/autonomy"]')) {
    nav.insertAdjacentHTML("afterbegin", '<a href="/admin/autonomy">Autonomy</a>');
  }
  if (nav) {
    const path = location.pathname;
    nav.querySelectorAll("a").forEach(link => {
      const href = link.getAttribute("href");
      const active = href === "/admin/autonomy"
        ? path === href
        : href === "/admin/ingest"
          ? path.startsWith("/admin/ingest")
          : href === "/admin/intelligence"
            ? path.startsWith("/admin/intelligence")
            : path === href;
      link.classList.toggle("active", active);
    });
  }

  const status = document.createElement("div");
  status.className = "rail-status";
  status.innerHTML = `<div class="rail-status-label"><span class="rail-status-dot"></span><span id="rail-mode">Connecting</span></div><div class="rail-status-meta" id="rail-meta">Runtime status</div>`;
  header.appendChild(status);
  api("/admin/api/autonomy/overview").then(data => {
    const mode = String(data.mode || "offline").toUpperCase();
    document.getElementById("rail-mode").textContent = data.enabled ? `${mode} runtime` : "Runtime unavailable";
    document.getElementById("rail-meta").textContent = data.broker?.configured ? `${data.broker.name} · connected` : "Broker not configured";
    document.querySelector(".rail-status-dot")?.classList.toggle("live", data.enabled);
  }).catch(() => {
    document.getElementById("rail-mode").textContent = "Runtime unavailable";
  });
}


// ── url query-param helpers ────────────────────────────────────────────────
//
// filters and sort state live in the url so reloads and shared links keep
// their shape. queryGet reads a single param, queryAll returns them all,
// queryWrite replaces the query string with the cleaned-up params (empty
// values removed). we use replaceState so each filter change doesnt spam
// history.

function queryGet(key, fallback = "") {
  const v = new URLSearchParams(location.search).get(key);
  return v == null ? fallback : v;
}


function queryAll() {
  return Object.fromEntries(new URLSearchParams(location.search));
}


function queryWrite(params) {
  const clean = {};
  for (const [k, v] of Object.entries(params)) {
    if (v === "" || v == null) continue;
    clean[k] = v;
  }
  const qs = new URLSearchParams(clean).toString();
  const next = location.pathname + (qs ? "?" + qs : "");
  history.replaceState(null, "", next);
}


// apply current query params onto form inputs — call on page init
function queryApplyToInputs(bindings) {
  for (const [id, key] of Object.entries(bindings)) {
    const el = document.getElementById(id);
    if (!el) continue;
    const v = queryGet(key, "");
    if (v !== "") el.value = v;
  }
}


// global stats bar — small counters shown on articles/events/stats pages
async function loadGlobalStats() {
  const bar = document.getElementById("statsBar");
  if (!bar) return;

  try {
    const data = await api("/admin/api/stats");
    const t = document.getElementById("s-total");
    if (t) t.textContent = data.total.toLocaleString();
    const c = document.getElementById("s-content");
    if (c) c.textContent = data.withContent.toLocaleString();
    const em = document.getElementById("s-embed");
    if (em) em.textContent = data.withEmbedding.toLocaleString();
    const ev = document.getElementById("s-events");
    if (ev) ev.textContent = data.eventCount.toLocaleString();
  } catch (_) { /* ignore — stats bar is best-effort */ }
}


// common overlay close-on-backdrop wiring
function wireOverlays() {
  document.querySelectorAll(".overlay").forEach(ov => {
    ov.addEventListener("click", e => {
      if (e.target === ov) ov.classList.remove("open");
    });
  });
}


document.addEventListener("DOMContentLoaded", () => {
  installChrome();
  wireOverlays();
  loadGlobalStats();
});