import React from "react";
import { Badge } from "../UI/Badge";
import { Button } from "../UI/Button";
import { Panel } from "../UI/Panel";
import { getInvitationReferenceLabel } from "./invitationReference";
import { supabase } from "../../supabaseClient";
import { matchesStopWord } from "../../hooks/useStopWords";

const flattenOrderProducts = (rawItems) => {
  if (!Array.isArray(rawItems) || rawItems.length === 0) return [];

  const products = [];

  for (const item of rawItems) {
    if (!item || typeof item !== "object") continue;

    const subItems = Array.isArray(item.items) ? item.items : [];

    if (subItems.length > 0) {
      const hasSubOrders = subItems.some(
        (s) => typeof s === "object" && ("nom" in s || ("items" in s && Array.isArray(s.items))),
      );

      if (hasSubOrders) {
        for (const sub of subItems) {
          if (!sub || typeof sub !== "object") continue;
          const productsList = Array.isArray(sub.items) ? sub.items : [];
          for (const p of productsList) {
            if (!p || typeof p !== "object") continue;
            const pName = String(p.product_name || p.name || "").trim();
            if (!pName) continue;
            products.push({
              name: pName,
              quantity: String(p.product_quantity || p.quantity || p.count || p.amount || "").trim(),
              unit: String(p.product_ed || p.unit || "").trim(),
              _sourceOrder: sub,
            });
          }
        }
      } else {
        for (const p of subItems) {
          if (!p || typeof p !== "object") continue;
          const pName = String(p.product_name || p.name || "").trim();
          if (!pName) continue;
          products.push({
            name: pName,
            quantity: String(p.product_quantity || p.quantity || p.count || p.amount || "").trim(),
            unit: String(p.product_ed || p.unit || "").trim(),
            _sourceOrder: item,
          });
        }
      }
      continue;
    }

    const name = String(item.product_name || item.name || item.nom || "").trim();
    if (!name) continue;
    products.push({
      name,
      quantity: String(item.product_quantity || item.quantity || item.count || item.amount || "").trim(),
      unit: String(item.product_ed || item.unit || "").trim(),
      _sourceOrder: item,
    });
  }

  return products;
};

export const OrderCompositionPanel = ({ invitation = {} }) => {
  const [stopWords, setStopWords] = React.useState([]);
  const [stopWordsLoaded, setStopWordsLoaded] = React.useState(false);
  const [scopeActive, setScopeActive] = React.useState(true);

  React.useEffect(() => {
    if (!supabase) { setStopWordsLoaded(true); return; }
    Promise.all([
      supabase.from("stop_words").select("word"),
      supabase.from("stop_words_scope").select("scope").eq("id", 1).single(),
    ]).then(([{ data: wordsData }, { data: scopeData }]) => {
        if (wordsData) setStopWords(wordsData.map((d) => d.word));
        setScopeActive(scopeData?.scope === "everywhere" || scopeData?.scope === "client_only");
        setStopWordsLoaded(true);
      })
      .catch(() => setStopWordsLoaded(true));
  }, []);

  const rawItems = invitation.orderItems || invitation.items || [];
  const allProducts = flattenOrderProducts(rawItems);
  const products = (stopWords.length && scopeActive)
    ? allProducts.filter((p) => !matchesStopWord(p.name, stopWords))
    : allProducts;

  const filteredCount = allProducts.length - products.length;
  const reference = getInvitationReferenceLabel(invitation);

  const [isExpanded, setIsExpanded] = React.useState(false);

  // Hide the entire panel if there are no products to show and some were filtered
  if (products.length === 0 && filteredCount > 0) return null;
  if (products.length === 0 && filteredCount === 0) return null;

  return (
    <Panel className="space-y-3 border shadow-soft p-5 sm:p-6">
      <Button
        variant="ghost"
        className="flex w-full items-center justify-between text-left"
        onClick={() => setIsExpanded(!isExpanded)}
      >
        <p className="text-sm uppercase tracking-[0.18em] text-[var(--color-text-muted)]">
          Состав заказа{reference && reference !== "Счет —" ? ` ${reference}` : ""}
        </p>
        <span className="flex items-center gap-2 text-sm text-[var(--color-text-muted)]">
          {products.length} поз.
          <svg
            className="h-4 w-4 transition-transform"
            style={{ transform: isExpanded ? "rotate(180deg)" : "rotate(0deg)" }}
            fill="none"
            viewBox="0 0 24 24"
            stroke="currentColor"
            strokeWidth={2}
          >
            <path strokeLinecap="round" strokeLinejoin="round" d="M19 9l-7 7-7-7" />
          </svg>
        </span>
      </Button>
      {isExpanded && (
        <div className="space-y-2">
          {products.map((product, idx) => (
            <div
              key={`${product.name}-${idx}`}
              className="flex items-center justify-between gap-3 rounded-[18px] border border-[var(--color-border)] bg-[var(--color-surface-strong)] px-4 py-3 text-sm"
            >
              <span className="leading-6">{product.name}</span>
              {(product.quantity || product.unit) ? (
                <Badge tone="neutral">{[product.quantity, product.unit].filter(Boolean).join(" ")}</Badge>
              ) : null}
            </div>
          ))}
        </div>
      )}
    </Panel>
  );
};