/**
 * Rendert die ECHTE WifiChannelChart.svelte (inkl. Kindkomponenten) server-
 * seitig zu SVG/PNG. Damit lässt sich eine Diagramm-Änderung ansehen, ohne
 * aufs Handy zu müssen — genau die Prüfung, deren Fehlen in Phase 4 dazu
 * geführt hat, dass ein rechnerisch korrektes, aber unlesbares Diagramm
 * ausgeliefert wurde.
 *   node tools/render-chart.mjs
 */
import { compile } from 'svelte/compiler';
import { transformSync } from 'esbuild';
import { render } from 'svelte/server';
import { readFileSync, writeFileSync, mkdirSync, existsSync } from 'fs';
import { pathToFileURL, fileURLToPath } from 'url';
import { dirname, resolve as pathResolve, basename } from 'path';

const ROOT = fileURLToPath(new URL('..', import.meta.url));
const OUT = pathResolve(ROOT, '.render');
mkdirSync(OUT, { recursive: true });

/** Svelte-/TS-Quelle rekursiv nach ESM kompilieren, $lib-Alias auflösen */
const cache = new Map();
function build(srcPath) {
  if (cache.has(srcPath)) return cache.get(srcPath);
  const code = readFileSync(srcPath, 'utf8');
  const isSvelte = srcPath.endsWith('.svelte');
  const outName = basename(srcPath).replace(/\.(svelte|ts)$/, '') + (isSvelte ? '.svelte.js' : '.js');
  const outPath = pathResolve(OUT, outName);
  cache.set(srcPath, outPath);

  let js;
  if (isSvelte) {
    js = compile(code, { generate: 'server', filename: basename(srcPath), runes: true }).js.code;
  } else {
    js = transformSync(code, { loader: 'ts', format: 'esm', target: 'node20' }).code;
  }

  // Importe umschreiben und Abhängigkeiten mitkompilieren
  js = js.replace(/from\s+['"]([^'"]+)['"]/g, (m, spec) => {
    if (spec.startsWith('svelte')) return m;
    let dep = null;
    if (spec.startsWith('$lib/')) dep = pathResolve(ROOT, 'src/lib', spec.slice(5));
    else if (spec.startsWith('.')) dep = pathResolve(dirname(srcPath), spec);
    if (!dep) return m;
    for (const ext of ['', '.ts', '.svelte', '.js']) {
      if (existsSync(dep + ext)) {
        const built = build(dep + ext);
        return `from './${basename(built)}'`;
      }
    }
    return m;
  });

  writeFileSync(outPath, js);
  return outPath;
}

const entry = build(pathResolve(ROOT, 'src/lib/components/WifiChannelChart.svelte'));
const { default: Chart } = await import(pathToFileURL(entry).href);
const tlEntry = build(pathResolve(ROOT, 'src/lib/components/WifiTimelineChart.svelte'));
const { default: Timeline } = await import(pathToFileURL(tlEntry).href);

const networks = [
  { ssid: 'FRITZ!Box 7590 SM', bssid: 'AA:00:01', channel: 6,   frequency: 2437, rssi: -48, band: '2.4 GHz', widthMhz: 20 },
  { ssid: 'FRITZ!Box 7590 SM', bssid: 'AA:00:02', channel: 44,  frequency: 5220, rssi: -55, band: '5 GHz',   widthMhz: 80, centerFreq0: 5210 },
  { ssid: 'Sandmann-Gast',     bssid: 'AA:00:03', channel: 6,   frequency: 2437, rssi: -52, band: '2.4 GHz', widthMhz: 20 },
  { ssid: 'Repeater-Halle',    bssid: 'AA:00:04', channel: 11,  frequency: 2462, rssi: -61, band: '2.4 GHz', widthMhz: 20 },
  { ssid: 'Repeater-Halle',    bssid: 'AA:00:05', channel: 100, frequency: 5500, rssi: -70, band: '5 GHz',   widthMhz: 80, centerFreq0: 5530 },
  { ssid: 'Nachbar-WLAN-1',    bssid: 'BB:00:01', channel: 1,   frequency: 2412, rssi: -74, band: '2.4 GHz', widthMhz: 40, centerFreq0: 2422 },
  { ssid: 'Telekom-2AB3F',     bssid: 'BB:00:02', channel: 11,  frequency: 2462, rssi: -79, band: '2.4 GHz', widthMhz: 20 },
  { ssid: 'Vodafone-Hotspot',  bssid: 'BB:00:03', channel: 13,  frequency: 2472, rssi: -85, band: '2.4 GHz', widthMhz: 20 },
  { ssid: 'o2-WLAN-9912',      bssid: 'BB:00:04', channel: 36,  frequency: 5180, rssi: -76, band: '5 GHz',   widthMhz: 20 },
  { ssid: 'DIRECT-hp-Drucker', bssid: 'BB:00:05', channel: 48,  frequency: 5240, rssi: -81, band: '5 GHz',   widthMhz: 20 },
  { ssid: 'Kamera-Hof-5G',     bssid: 'BB:00:06', channel: 149, frequency: 5745, rssi: -72, band: '5 GHz',   widthMhz: 40, centerFreq0: 5755 },
  { ssid: 'Buero-AP-2',        bssid: 'BB:00:07', channel: 161, frequency: 5805, rssi: -68, band: '5 GHz',   widthMhz: 80, centerFreq0: 5775 },
];

const SZENARIEN = [
  { name: 'kunde-24', band: '2.4 GHz', nets: networks, self: 'AA:00:01' },
  { name: 'kunde-5',  band: '5 GHz',   nets: networks, self: 'AA:00:02' },
  { name: 'einzeln',  band: '2.4 GHz', nets: [networks[0]], self: 'AA:00:01' },
  { name: 'leer5',    band: '5 GHz',   nets: [], self: undefined },
  { name: 'stapel',   band: '2.4 GHz', self: 'CC:00:01',
    nets: [1,2,3,4,5].map((i) => ({ ssid: `Netz-auf-Kanal-6-Nr${i}`, bssid: `CC:00:0${i}`, channel: 6, frequency: 2437, rssi: -45 - i*8, band: '2.4 GHz', widthMhz: 20 })) },
  { name: 'randlage', band: '2.4 GHz', self: 'DD:00:01',
    nets: [
      { ssid: 'GanzLinksAmRand', bssid: 'DD:00:01', channel: 1,  frequency: 2412, rssi: -50, band: '2.4 GHz', widthMhz: 20 },
      { ssid: 'GanzRechtsAmRand', bssid: 'DD:00:02', channel: 13, frequency: 2472, rssi: -55, band: '2.4 GHz', widthMhz: 20 },
    ] },
  { name: 'voll5', band: '5 GHz', self: 'EE:00:00',
    nets: [36,40,44,48,52,56,60,64,100,104,108,112,116,120,124,128,132,136,140,144,149,153,157,161,165].map((ch, i) => ({
      ssid: `AP-${ch}`, bssid: `EE:00:${String(i).padStart(2,'0')}`, channel: ch,
      frequency: 5000 + ch*5, rssi: -50 - (i % 8) * 5, band: '5 GHz', widthMhz: 20 })) },
];

const FARBEN = [
  [/text-zinc-800/, 'stroke:#27272a'], [/text-zinc-700/, 'stroke:#3f3f46'],
  [/text-zinc-600/, 'stroke:#52525b'], [/text-zinc-400/, 'stroke:#a1a1aa'],
  [/fill-zinc-600/, 'fill:#52525b'], [/fill-zinc-500/, 'fill:#71717a'],
  [/fill-zinc-400/, 'fill:#a1a1aa'], [/fill-zinc-300/, 'fill:#d4d4d8'],
  [/fill-zinc-200/, 'fill:#e4e4e7'],
  [/fill-emerald-500\/\[0\.07\]/, 'fill:rgba(16,185,129,.07)'],
  [/fill-red-500\/\[0\.07\]/, 'fill:rgba(239,68,68,.07)'],
  [/fill-emerald-500\/70/, 'fill:rgba(16,185,129,.7)'],
  [/stroke-amber-400/, 'stroke:#fbbf24'],
  // Netzfarben (fill /25 + stroke + text)
  [/fill-violet-400\/25/, 'fill:rgba(167,139,250,.25)'], [/stroke-violet-400/, 'stroke:#a78bfa'], [/fill-violet-300/, 'fill:#c4b5fd'],
  [/fill-emerald-400\/25/, 'fill:rgba(52,211,153,.25)'], [/stroke-emerald-400/, 'stroke:#34d399'], [/fill-emerald-300/, 'fill:#6ee7b7'],
  [/fill-amber-400\/25/, 'fill:rgba(251,191,36,.25)'], [/fill-amber-300/, 'fill:#fcd34d'],
  [/fill-rose-400\/25/, 'fill:rgba(251,113,133,.25)'], [/stroke-rose-400/, 'stroke:#fb7185'], [/fill-rose-300/, 'fill:#fda4af'],
  [/fill-lime-400\/25/, 'fill:rgba(163,230,53,.25)'], [/stroke-lime-400/, 'stroke:#a3e635'], [/fill-lime-300/, 'fill:#bef264'],
  [/fill-orange-400\/25/, 'fill:rgba(251,146,60,.25)'], [/stroke-orange-400/, 'stroke:#fb923c'], [/fill-orange-300/, 'fill:#fdba74'],
  [/fill-teal-400\/25/, 'fill:rgba(45,212,191,.25)'], [/stroke-teal-400/, 'stroke:#2dd4bf'], [/fill-teal-300/, 'fill:#5eead4'],
  [/fill-fuchsia-400\/25/, 'fill:rgba(232,121,249,.25)'], [/stroke-fuchsia-400/, 'stroke:#e879f9'], [/fill-fuchsia-300/, 'fill:#f0abfc'],
  [/fill-sky-500\/40/, 'fill:rgba(14,165,233,.4)'], [/stroke-sky-300/, 'stroke:#7dd3fc'], [/fill-sky-200/, 'fill:#bae6fd'],
];

function farbig(svg) {
  return svg.replace(/class="([^"]*)"/g, (_m, cls) => {
    const styles = FARBEN.filter(([re]) => re.test(cls)).map(([, v]) => v).join(';');
    return styles ? `data-style="${styles}"` : '';
  }).replace(/data-style="([^"]*)"\s*style="([^"]*)"/g, 'style="$1;$2"')
    .replace(/style="([^"]*)"\s*data-style="([^"]*)"/g, 'style="$1;$2"')
    .replace(/data-style="([^"]*)"/g, 'style="$1"');
}

for (const s of SZENARIEN) {
  const { body } = render(Chart, { props: { networks: s.nets, band: s.band, highlightBssid: s.self } });
  const svgs = body.match(/<svg[\s\S]*?<\/svg>/g) ?? [];
  if (svgs.length === 0) { console.log(`${s.name}: kein SVG`); continue; }
  // Jedes Segment hat seine EIGENE Hoehe (leere Baender werden kompakt
  // gezeichnet) — stapeln muss daher kumulativ erfolgen, sonst zeigt das
  // Testbild kuenstliche Luecken, die es in der App nicht gibt.
  const hoehen = svgs.map((sv) => Number((sv.match(/viewBox="0 0 \d+ (\d+)"/) ?? [])[1] ?? 190));
  const gesamt = hoehen.reduce((a, b) => a + b, 0);
  let yOff = 0;
  const teile = svgs.map((sv, i) => {
    const g = `<g transform="translate(0,${yOff})">` +
      farbig(sv).replace(/^<svg[^>]*>/, '').replace(/<\/svg>$/, '') + `</g>`;
    yOff += hoehen[i];
    return g;
  });
  const kombiniert =
    `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 ${gesamt}" width="960" height="${gesamt * 3}">` +
    `<rect width="320" height="${gesamt}" fill="#18181b"/>` + teile.join('') + `</svg>`;
  writeFileSync(pathResolve(OUT, `${s.name}.svg`), kombiniert);
  console.log(`gerendert: .render/${s.name}.svg  (${s.band}, ${s.nets.length} Netze, ${svgs.length} Segment(e))`);
}


/* --- Zeitverlauf: mehrere Momentaufnahmen, mit Lücke (Netz zeitweise weg) --- */
const T0 = 1786800000000;
const surveys = [0, 1, 2, 3, 4].map((i) => ({
  id: 's' + i,
  createdAt: T0 + i * 15 * 60 * 1000,
  networks: networks
    // Nur 4 Netze, damit alle in die Top-6 der Legende passen; das VIERTE
    // fehlt in Aufnahme 2 und 3 -> seine Linie MUSS reißen. Wird sie
    // durchgezogen, verschweigt das Diagramm einen Aussetzer.
    .slice(0, 4)
    .filter((_n, idx) => !(idx === 3 && (i === 2 || i === 3)))
    .map((n) => ({ ...n, rssi: n.rssi + [0, -4, -9, -3, 2][i] })),
}));
{
  const { body } = render(Timeline, { props: { surveys, connectedBssid: 'AA:00:01' } });
  const svgs = body.match(/<svg[\s\S]*?<\/svg>/g) ?? [];
  if (svgs.length) {
    const H = Number((svgs[0].match(/viewBox="0 0 \d+ (\d+)"/) ?? [])[1] ?? 170);
    const out =
      `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 ${H}" width="960" height="${H * 3}">` +
      `<rect width="320" height="${H}" fill="#18181b"/>` +
      farbig(svgs[0]).replace(/^<svg[^>]*>/, '').replace(/<\/svg>$/, '') +
      `</svg>`;
    writeFileSync(pathResolve(OUT, 'zeitverlauf.svg'), out);
    console.log('gerendert: .render/zeitverlauf.svg (5 Momentaufnahmen, eine Lücke)');
  } else {
    console.log('zeitverlauf: kein SVG (zu wenige Aufnahmen?)');
  }
}