/**
 * Adapter Davis (davis.pl) — parser strony kolekcji tkaniny.
 * Wejście: utrwalony snapshot HTML strony /kolekcja/{slug}/.
 * Struktura strony (WordPress + ACF, stan 2026-09):
 *   h1.product__title                       — nazwa kolekcji
 *   dl.product__details > dt/dd             — parametry techniczne
 *   .product__technologies                  — badge'e technologii (może być pusty)
 *   a.product__colors__element[href][title] — odcienie; href = pełnowymiarowa
 *     próbka ~2000px, span.product__colors__title = kod ("01", "83", "100")
 *   a[href*="generate-card"]                — karta PDF z PIM (pim.davis.pl)
 * 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(",", "."));

/** "420g/m² +/-5%" → {value:420, tolerance:"±5%"}; "500g/m² +/-10%" analogicznie */
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]}%` } : {}) };
}

/** "90000-100000" → {min,max}; ">100000" → {min}; "4" → 4; "min. 140cm" → {min:140} */
function parseRange(v: string): unknown {
  const nums = [...v.matchAll(/(\d[\d\s]*(?:[.,]\d+)?)/g)].map((m) => num(m[1]!));
  if (!nums.length) return v;
  if (/^>/.test(v.trim()) || /^min/i.test(v.trim())) return { min: nums[0] };
  if (nums.length >= 2) return { min: nums[0], max: nums[1] };
  return nums[0];
}

/** "1,9-2,1 mm WARP / 1,5-1,7 mm WEFT" → {warp:{min,max}, weft:{min,max}} */
function parseSlippage(v: string): unknown {
  const warp = v.match(/([\d.,]+)\s*-\s*([\d.,]+)\s*mm\s*WARP/i);
  const weft = v.match(/([\d.,]+)\s*-\s*([\d.,]+)\s*mm\s*WEFT/i);
  if (!warp && !weft) return v;
  const range = (m: RegExpMatchArray | null) => (m ? { min: num(m[1]!), max: num(m[2]!) } : null);
  return { ...(range(warp) ? { warp: range(warp) } : {}), ...(range(weft) ? { weft: range(weft) } : {}) };
}

/** "light-4-5 / medium-5 / dark-4-5" → {light:"4-5", medium:"5", dark:"4-5"}; "4-5" → {min:4,max:5} */
function parseRubbing(v: string): unknown {
  const tones = [...v.matchAll(/(light|medium|dark)\s*-\s*(\d(?:-\d)?)/gi)];
  if (tones.length) {
    const out: Record<string, string> = {};
    for (const t of tones) out[t[1]!.toLowerCase()] = t[2]!;
    return out;
  }
  return parseRange(v);
}

/** "100% Polyester" → "100% poliester" (kanon jak w params_json TILII) */
function parseComposition(v: string): string {
  return v.replace(/\s+/g, " ").trim().replace(/polyester/i, "poliester");
}

const DETAIL_LABELS: Array<[RegExp, string, (v: string) => unknown]> = [
  [/^gramatura/i, "grammage_g_m2", parseGrammage],
  [/^skład/i, "composition", parseComposition],
  [/^szerokość/i, "usable_width_cm", parseRange],
  [/martindale/i, "martindale_cycles", parseRange],
  [/przesuwalność/i, "seam_slippage_mm", parseSlippage],
  [/mechacenia|pillingu/i, "pilling_grade", parseRange],
  [/tarcie\s+suche/i, "rubbing_fastness_dry", parseRubbing],
  [/tarcie\s+mokre/i, "rubbing_fastness_wet", parseRubbing],
];

const TECH_FLAGS: Array<[RegExp, string]> = [
  [/easy[\s-]*clean/i, "easy_clean"],
  [/water[\s-]*repellent|hydrofob/i, "water_repellent"],
  [/pet[\s-]*friendly/i, "pet_friendly"],
  [/recycled/i, "recycled"],
];

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

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

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

  // --- parametry: dl.product__details > dt/dd ---
  const params: Record<string, unknown> = {};
  $("dl.product__details > dt").each((_, el) => {
    const label = $(el).text().replace(/\s+/g, " ").trim();
    const dd = $(el).next("dd");
    const value = dd.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;
  });

  // --- technologie: tekst badge'ów + alt ikon ---
  const techText = `${$(".product__technologies").text()} ${$(".product__technologies img").map((_, i) => $(i).attr("alt") ?? "").get().join(" ")}`;
  for (const [re, key] of TECH_FLAGS) if (re.test(techText)) params[key] = true;

  // --- odcienie: a.product__colors__element ---
  const shades = new Map<string, ParsedFabricShade>();
  $("a.product__colors__element").each((_, el) => {
    const href = ($(el).attr("href") ?? "").trim();
    const code = $(el).find(".product__colors__title").first().text().replace(/\s+/g, "").trim();
    if (!href || !code || shades.has(code)) return;
    const imageUrl = href.startsWith("//") ? `https:${href}` : new URL(href, pageUrl).href;
    const title = ($(el).attr("title") ?? "").trim();
    // title zwykle "Tilia 01" → nazwa handlowa po odjęciu kolekcji i kodu
    const shadeName = title.replace(new RegExp(`^${name}`, "i"), "").replace(code, "").trim() || null;
    const vendorCode = imageUrl.match(/\/([\w-]+)\.(?:jpe?g|png|webp)(?:[?#]|$)/i)?.[1] ?? code;
    shades.set(code, { code, vendorCode, name: shadeName, imageUrl });
  });
  if (!shades.size) {
    throw new FabricParseError("no_shades", "Strona kolekcji Davis nie zawiera odcieni (a.product__colors__element).");
  }

  // --- karta PDF: link PIM (protokół-względny //pim.davis.pl/...) ---
  const cardHref = $("a[href*='generate-card']").first().attr("href")?.trim() ?? null;
  const cardUrl = cardHref ? (cardHref.startsWith("//") ? `https:${cardHref}` : new URL(cardHref, pageUrl).href) : null;

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