/**
 * FINALE Neukonvertierung aller Guides.
 *
 * Strategie:
 * 1. \\n -> echte Newlines
 * 2. Nav/Footer/SVG komplett entfernen
 * 3. style-Attribute entfernen (verursachen Backslash-Tabellen)
 * 4. node-html-markdown konvertiert den bereinigten HTML
 * 5. Post-Cleanup: verbleibende Artefakte
 */
import fs from "fs";
import path from "path";
import { NodeHtmlMarkdown } from "node-html-markdown";

const BACKUP_POSTS = "backup/content/posts";
const BACKUP_PAGES = "backup/content/pages";
const OUT_GUIDES = "app/src/content/guides";
const OUT_PAGES = "app/src/content/pages";

const SKIP = new Set([
  "guide-1-pla-perfekt-einstellen-2026-03-25",
  "guide-2-stringing-reduzieren-2026-03-25",
  "guide-1-warping-vermeiden-2026-03-26",
  "guide-2-petg-ohne-frust-2026-03-26",
]);

const categorize = (s) => {
  if (/guide-orcaslicer|guide-cura|guide-bambu|guide-prusaslicer|slicer/.test(s)) return "Slicer";
  if (/pla|petg|tpu|asa|abs|nylon|carbon|resin|filament|bed-adhesion/.test(s)) return "Materialien";
  if (/stringing|warping|unterextrusion|layer-separation|elefantenfuss|verstopfte/.test(s)) return "Fehlerbehebung";
  if (/retraction|flow-rate|pressure-advance|input-shaping|temperaturturm|speed-tower|erste-schicht|druckbett-leveln/.test(s)) return "Kalibrierung";
  if (/adaptive|modifier|ironing|fuzzy|multi-material|klipper/.test(s)) return "Fortgeschritten";
  if (/erstes-modell|support|infill|duesenwechsel|druckzeit|masshaltigkeit|bruecken|nachbearbeiten|gridfinity|naht/.test(s)) return "Grundlagen";
  return "Allgemein";
};

const diff = (slug, cat) => {
  if (/erstes-modell|erste-schicht|druckbett-leveln/.test(slug)) return "einsteiger";
  if (cat === "Fortgeschritten" || /klipper|pressure-advance|input-shaping|carbon|nylon-pa/.test(slug)) return "experte";
  return "fortgeschritten";
};

const nhm = new NodeHtmlMarkdown({
  keepDataImages: false,
  useLinkReferenceDefinitions: false,
});

function cleanHtml(raw) {
  let html = raw;

  // 1. Escaped newlines -> echte
  html = html.replace(/\\n/g, "\n");

  // 2. WordPress-Kommentare entfernen (nur die Tags)
  html = html.replace(/<!-- \/?wp:\w+ -->/g, "");

  // 3. Komplette Nav-Bloecke entfernen
  html = html.replace(/<nav[^>]*>[\s\S]*?<\/nav>/gi, "");
  html = html.replace(/<div[^>]*class="v2-mobile-menu"[^>]*>[\s\S]*?<\/div>/gi, "");

  // 4. Footer-Bloecke entfernen
  html = html.replace(/<footer[^>]*>[\s\S]*?<\/footer>/gi, "");

  // 5. SVG-Bloecke entfernen (Hero-Grafiken)
  html = html.replace(/<svg[^>]*>[\s\S]*?<\/svg>/gi, "");

  // 6. KRITISCH: style-Attribute entfernen (verursachen Backslash-Tabellen!)
  html = html.replace(/\s+style="[^"]*"/gi, "");

  // 7. Wrapping-Divs mit bekannten Klassen entfernen
  html = html.replace(/<div[^>]*class="(?:v2-guide|hub-section|v2-footer|lead)"[^>]*>/gi, "");

  // 8. class-Attribute bereinigen
  html = html.replace(/\s+class="[^"]*"/gi, "");

  // 9. Hamburger-Buttons
  html = html.replace(/<button[^>]*>[\s\S]*?<\/button>/gi, "");

  return html;
}

function processFile(filePath, outDir) {
  const raw = fs.readFileSync(filePath, "utf-8");
  const fmMatch = raw.match(/^---\n([\s\S]*?)\n---\n([\s\S]*)$/);
  if (!fmMatch) return null;

  const fmBlock = fmMatch[1];
  const htmlContent = fmMatch[2].trim();

  const title = fmBlock.match(/title:\s*"(.+?)"/)?.[1] ?? path.basename(filePath, ".html");
  const slug = fmBlock.match(/slug:\s*"(.+?)"/)?.[1] ?? path.basename(filePath, ".html");

  if (SKIP.has(slug)) return null;

  // HTML bereinigen
  const cleanedHtml = cleanHtml(htmlContent);

  // Konvertieren
  let md = nhm.translate(cleanedHtml);

  // Post-Cleanup
  md = md
    // WordPress-Reste
    .replace(/M0LZI[_\\]*3D[\s\S]*?\[SYS_BOOT[^\]]*\]/g, "")
    .replace(/\[WISSEN\][\s\S]*?\[FAQ\]/gs, "")
    .replace(/JOIN_NETWORK.*?→/g, "")
    .replace(/M0LZI[_\\]*3D © \d{4}/g, "")
    .replace(/\[WHATSAPP\][\s\S]*?\[DATENSCHUTZ\][\s\S]*?$/gm, "")
    // Backslash-Artefakte
    .replace(/^\s*\\+\s*$/gm, "")
    .replace(/^\\ /gm, "")
    .replace(/ \\$/gm, "")
    .replace(/\\\s{2,}/g, " ")
    // Escaped Sonderzeichen
    .replace(/\\~/g, "~")
    .replace(/\\\[/g, "[")
    .replace(/\\\]/g, "]")
    .replace(/\\_/g, "_")
    // Doppelte Leerzeilen
    .replace(/\n{3,}/g, "\n\n")
    .trim();

  const cat = categorize(slug);
  const d = diff(slug, cat);

  const fm = `---\ntitle: "${title}"\nslug: "${slug}"\ncategory: "${cat}"\ndifficulty: "${d}"\nexcerpt: ""\n---`;

  const outPath = path.join(outDir, `${slug}.md`);
  fs.writeFileSync(outPath, `${fm}\n\n${md}\n`, "utf-8");
  return slug;
}

// Main
console.log("=== FINALE Neukonvertierung ===\n");

let ok = 0;
for (const f of fs.readdirSync(BACKUP_POSTS).filter(f => f.endsWith(".html")).sort()) {
  const r = processFile(path.join(BACKUP_POSTS, f), OUT_GUIDES);
  if (r) { console.log(`  OK: ${r}`); ok++; }
}
console.log(`\n${ok} Guides.\n`);

let pok = 0;
for (const f of fs.readdirSync(BACKUP_PAGES).filter(f => f.endsWith(".html")).sort()) {
  const r = processFile(path.join(BACKUP_PAGES, f), OUT_PAGES);
  if (r) { console.log(`  OK: ${r}`); pok++; }
}
console.log(`\n${pok} Pages.\n`);

// Verifikation
console.log("=== Verifikation ===");
let issues = 0;
for (const dir of [OUT_GUIDES, OUT_PAGES]) {
  for (const f of fs.readdirSync(dir).filter(f => f.endsWith(".md")).sort()) {
    const c = fs.readFileSync(path.join(dir, f), "utf-8");
    const inlineTables = c.split("\n").filter(l => l.includes("| ---") && l.split("|").length > 8).length;
    const backslashJunk = (c.match(/^\s*\\{2,}/gm) || []).length;
    const tables = (c.match(/\n\| -/g) || []).length;

    if (inlineTables > 0 || backslashJunk > 0) {
      console.log(`  ISSUE: ${f} (${inlineTables} inline, ${backslashJunk} bs)`);
      issues++;
    }
  }
}
console.log(issues === 0 ? "\nAlle sauber!" : `\n${issues} Probleme`);

// Stichprobe
console.log("\n=== Stichprobe: Carbon Fiber ===");
const cf = fs.readFileSync(path.join(OUT_GUIDES, "carbon-fiber-glasfaser-filamente.md"), "utf-8");
console.log(cf.split("\n").slice(0, 40).join("\n"));