/**
 * Adapter Lech Fabrics (lechfabrics.com) — parser strony kolekcji tkaniny.
 * Wejście: utrwalony snapshot HTML strony /pl/kolekcja/{slug}.
 * Struktura strony (Bootstrap + fancybox, stan 2026-09):
 *   meta[property="og:title"]                          — nazwa kolekcji ("LUMO")
 *   .offer-description-name2 + .offer-description      — parametry techniczne (pary etykieta/wartość)
 *   a[data-fancybox][data-src][data-caption]           — odcienie; data-src = pełnowymiarowa
 *     próbka JPG (upload/import/colors/...), data-caption = "LUMO 30"
 *   .conservation-svg[data-bs-title]                   — ikony konserwacji (tooltipy)
 *   a[href$=".pdf"]                                    — karta produktu PDF
 * Wyjście: wspólny kontrakt ParsedFabricCollection (fabricParser.ts).
 * Bez sieci, bez zapisu do DB.
 */

import { load } from "cheerio";
import { FabricParseError, type ParsedFabricCollection, type ParsedFabricShade } from "./fabricParser.js";

const num = (s: string) => Number(s.replace(/\s/g, "").replace(",", "."));

/** "300 g/m² ± 10%" → {value:300, tolerance:"±10%"} */
function parseGrammage(v: string): unknown {
  const g = v.match(/(\d[\d\s]*)\s*g\s*\/\s*m/i);
  if (!g) return v;
  const tol = v.match(/\+\s*\/\s*-\s*(\d+)\s*%|±\s*(\d+)\s*%/);
  return { value: num(g[1]!), ...(tol ? { tolerance: `±${tol[1] ?? tol[2]}%` } : {}) };
}

/** "143 cm ± 2 cm" → {value:143, tolerance:"±2 cm"}; "140 cm" → {value:140} */
function parseWidth(v: string): unknown {
  const w = v.match(/(\d[\d\s]*(?:[.,]\d+)?)\s*cm/i);
  if (!w) return v;
  const tol = v.match(/±\s*(\d[\d\s]*(?:[.,]\d+)?)\s*cm/i);
  return { value: num(w[1]!), ...(tol ? { tolerance: `±${num(tol[1]!)} cm` } : {}) };
}

/** ">5" → {min:5}; "< 30000 cykli" → {max:30000}; "4-5" → {min:4,max:5}; "A" → "A" */
function parseRange(v: string): unknown {
  const t = v.trim();
  const nums = [...t.matchAll(/(\d[\d\s]*(?:[.,]\d+)?)/g)].map((m) => num(m[1]!));
  if (!nums.length) return t;
  if (/^[<>]/.test(t)) return t.startsWith(">") ? { min: nums[0] } : { max: nums[0] };
  if (nums.length >= 2) return { min: nums[0], max: nums[1] };
  return nums[0];
}

const DETAIL_LABELS: Array<[RegExp, string, (v: string) => unknown]> = [
  [/^skład/i, "composition", (v) => v.replace(/\s+/g, " ").trim()],
  [/^gramatura/i, "grammage_g_m2", parseGrammage],
  [/^szerokość/i, "usable_width_cm", parseWidth],
  [/odporność na ścieranie|martindale/i, "martindale_cycles", parseRange],
  [/odporność na światło/i, "light_fastness", parseRange],
  [/trudnopalność/i, "flammability", (v) => v],
  [/^kolory/i, "colors_count", (v) => Number(v.replace(/\D/g, "")) || v],
];

const labelKey = (label: string) =>
  label.normalize("NFD").replace(/[̀-ͯ]/g, "").toLowerCase()
    .replace(/[^a-z0-9]+/g, "_").replace(/^_+|_+$/g, "").slice(0, 40) || "detail";

export function parseLechCollectionPage(html: string, pageUrl: string): ParsedFabricCollection {
  let host: string;
  try { host = new URL(pageUrl).hostname; } catch { throw new FabricParseError("unsupported_host", "Nieprawidłowy URL kolekcji Lech."); }
  if (!/(^|\.)lechfabrics\.com$/i.test(host)) {
    throw new FabricParseError("unsupported_host", "Adapter Lech obsługuje wyłącznie lechfabrics.com.");
  }

  const $ = load(html);
  const name = (
    $("meta[property='og:title']").attr("content")
    ?? $("h1").first().text()
    ?? ""
  ).replace(/\s+/g, " ").trim();
  if (!name) throw new FabricParseError("no_title", "Strona kolekcji Lech nie zawiera nazwy (og:title).");
  const slug = pageUrl.match(/\/kolekcja\/([\w-]+)/i)?.[1];
  const code = slug ?? name.normalize("NFD").replace(/[̀-ͯ]/g, "").toLowerCase()
    .replace(/[^a-z0-9]+/g, "-").replace(/^-+|-+$/g, "").slice(0, 40);

  // --- parametry: pary .offer-description-name2 / .offer-description ---
  const params: Record<string, unknown> = {};
  $(".offer-description-name2").each((_, el) => {
    const label = $(el).text().replace(/\s+/g, " ").replace(/:$/, "").trim();
    const value = $(el).parent().find(".offer-description").first().text().replace(/\s+/g, " ").trim();
    if (!label || !value) return;
    const known = DETAIL_LABELS.find(([re]) => re.test(label));
    params[known ? known[1] : labelKey(label)] = known ? known[2](value) : value;
  });

  // --- rodzaj tkaniny z tekstu opisu ---
  const bodyText = $("body").text();
  if (/szenil/i.test(bodyText)) params.fabric_type = "szenil";
  else if (/chenille/i.test(bodyText)) params.fabric_type = "chenille";

  // --- ikony konserwacji: tooltips bootstrap ---
  const care = $(".conservation-svg[data-bs-title]")
    .map((_, el) => ($(el).attr("data-bs-title") ?? "").trim())
    .get()
    .filter(Boolean);
  if (care.length) params.care = [...new Set(care)];

  // --- odcienie: a[data-fancybox][data-src][data-caption] ---
  const shades = new Map<string, ParsedFabricShade>();
  $("a[data-fancybox][data-src]").each((_, el) => {
    const src = ($(el).attr("data-src") ?? "").trim();
    if (!/\/colors\//i.test(src) || !/\.(?:jpe?g|png|webp)(?:[?#]|$)/i.test(src)) return;
    const caption = ($(el).attr("data-caption") ?? "").replace(/\s+/g, " ").trim();
    const fileStem = src.match(/\/([\w-]+)\.(?:jpe?g|png|webp)(?:[?#]|$)/i)?.[1] ?? "";
    // kod: sufiks podpisu ("LUMO 30" → "30") albo sufiks pliku ("LUMO-30" → "30");
    // wpis bez kodu w podpisie ("LUMO") to zdjęcie kolekcji, nie odcień
    const code = caption.match(/(\w+)$/)?.[1] ?? fileStem.match(/-(\w+)$/)?.[1] ?? "";
    if (!code || !/^\w{1,10}$/.test(code) || shades.has(code)) return;
    if (caption && caption.toUpperCase() === name.toUpperCase() && !caption.match(/\d/)) return;
    const imageUrl = src.startsWith("//") ? `https:${src}` : new URL(src, pageUrl).href;
    shades.set(code, {
      code,
      vendorCode: fileStem || code,
      name: null,
      imageUrl,
    });
  });
  if (!shades.size) {
    throw new FabricParseError("no_shades", "Strona kolekcji Lech nie zawiera odcieni (a[data-fancybox][data-src]).");
  }

  // --- karta PDF produktu ---
  const cardHref = $("a[href$='.pdf']").first().attr("href")?.trim() ?? null;
  const cardUrl = cardHref ? new URL(cardHref, pageUrl).href : null;

  return {
    code,
    name,
    producer: "Lech Fabrics",
    params,
    cardUrl,
    shades: [...shades.values()].sort((a, b) => a.code.localeCompare(b.code, undefined, { numeric: true })),
  };
}