// overview.js — Dashboard-Kopf: Hero + Mini-Stats, KPI-Reihe, Stack-Gesundheit,
// kompakte Modell-Liste ("Session Router"). Speist sich aus /api/status + /api/jobs.

import { $, icon, esc } from "../core/ui.js";

let S = null;   // letzter Status
let J = [];     // letzte Job-Liste

const RUNNING = new Set(["running", "ready", "loading", "starting"]);

function counts() {
  const models = S?.models || [];
  return {
    total:   models.length,
    running: models.filter(m => RUNNING.has(m.state)).length,
    jobsRun: J.filter(j => j.state === "running" || j.state === "queued").length,
    jobsErr: J.filter(j => j.state === "failed").length,
    swap:    !!S?.swap_ok,
  };
}

function mini(label, val, tone = "") {
  const v = tone ? `<b style="${tone === "bad" ? "color:var(--err)" : ""}">${val}</b>` : val;
  return `<div class="mini"><div class="l">${label}</div><div class="v">${v}</div></div>`;
}

function renderHero() {
  const c = counts();
  $("#hero").innerHTML = `<div class="hero">
    <div>
      <div class="eyebrow">Übersicht</div>
      <h1>Mission Control</h1>
      <p>Steuerzentrale für deinen lokalen llama-swap-Stack — Modelle, Downloads,
         Wartung und Schnelltest an einem Ort.</p>
    </div>
    <div class="hero-stats">
      ${mini("Modelle", c.total)}
      ${mini("Aktiv", c.running, "on")}
      ${mini("Jobs", c.jobsRun)}
      ${mini("Fehler", c.jobsErr, c.jobsErr ? "bad" : "")}
    </div>
  </div>`;
}

function kpi(cls, title, ic, value, sub) {
  return `<div class="kpi ${cls}">
    <div class="k-h"><span class="k-t">${title}</span><span class="k-ic">${icon(ic)}</span></div>
    <div class="k-v">${value}</div>
    <div class="k-s">${sub}</div>
  </div>`;
}

function renderKpis() {
  const c = counts();
  $("#kpis").innerHTML =
    kpi(c.swap ? "green" : "red", "llama-swap", "swap",
        c.swap ? "Online" : "Offline", "Transport-Status") +
    kpi("blue", "Modelle", "monitor",
        `${c.running}<small>/${c.total}</small>`, "aktiv / gesamt") +
    kpi("purple", "Jobs", "layers", c.jobsRun, "laufend") +
    kpi(c.jobsErr ? "red" : "muted", "Fehler", "alert", c.jobsErr, "in der Aktivität") +
    kpi("muted", "System-Last", "gauge", "n/a", "bald · Live-Auslastung");
}

function kvRow(k, v, cls = "") {
  return `<div class="kv-row"><span class="kv-k">${k}</span><span class="kv-v ${cls}">${v}</span></div>`;
}

function renderHealth() {
  const c = counts();
  $("#health").innerHTML = `
    <div class="card-h"><h3>Stack-Gesundheit</h3>
      <span class="meta ${c.swap ? "ok" : ""}">${c.swap ? "Connected" : "Offline"}</span></div>
    <div class="kv">
      ${kvRow("llama-swap", c.swap ? "Connected" : "Offline", c.swap ? "ok" : "bad")}
      ${kvRow("Modelle (gesamt)", c.total)}
      ${kvRow("Aktiv", c.running, c.running ? "ok" : "")}
      ${kvRow("Jobs (laufend)", c.jobsRun)}
      ${kvRow("Fehler", c.jobsErr, c.jobsErr ? "bad" : "")}
      ${kvRow("Auslastung (RAM/GPU/Disk)", "folgt", "na")}
    </div>`;
}

function modelRow(m) {
  const on = RUNNING.has(m.state);
  const dot = m.state === "loading" || m.state === "starting" ? "load" : on ? "on" : "";
  const state = on ? (m.state === "loading" ? "lädt…" : "geladen") : "bereit";
  return `<div class="li">
    <span class="li-dot ${dot}"></span>
    <div class="li-main">
      <div class="li-id">${esc(m.name)}</div>
      <div class="li-sub">TTL ${m.ttl ?? "—"}${typeof m.ttl === "number" ? "s" : ""}</div>
    </div>
    <div class="li-right">
      <div class="li-meta">${m.port ?? "auto"}</div>
      <div class="li-time">${state}</div>
    </div>
  </div>`;
}

function renderModels() {
  const models = S?.models || [];
  $("#ov-models").innerHTML = `
    <div class="card-h"><h3>Modelle</h3><span class="meta">${models.length || ""}</span></div>
    ${models.length
      ? `<div class="list">${models.map(modelRow).join("")}</div>`
      : `<div class="empty-c"><div class="e-t">Keine Modelle konfiguriert</div>
           <div class="e-s">Hol dir unter „Modelle" eins von HuggingFace.</div></div>`}`;
}

function renderAll() { renderHero(); renderKpis(); renderHealth(); renderModels(); }

function mount() { renderAll(); }
function onStatus(s) { S = s; renderAll(); }
function onJobs(jobs) { J = jobs || []; renderHero(); renderKpis(); renderHealth(); }

export default { id: "overview", mount, onStatus, onJobs };