"use client";

import { useCallback, useEffect, useMemo, useRef, useState } from "react";

import type {
  Cursor,
  PortfolioArtworkItem,
  PortfolioFilters,
} from "@/actions/portfolio/getPortfolioArtworksPage";
import { getPortfolioArtworksPage } from "@/actions/portfolio/getPortfolioArtworksPage";
import JustifiedGallery, {
  type JustifiedGalleryItem,
} from "@/components/gallery/JustifiedGallery";

export default function PortfolioGallery({
  filters,
}: {
  filters: PortfolioFilters;
}) {
  const { year, albumId, q } = filters;

  const queryFilters = useMemo<PortfolioFilters>(
    () => ({ year, albumId, q }),
    [year, albumId, q]
  );
  const resetKey = useMemo(
    () => `${year ?? ""}|${albumId ?? ""}|${q ?? ""}`,
    [year, albumId, q]
  );

  const [items, setItems] = useState<PortfolioArtworkItem[]>([]);
  const [done, setDone] = useState(false);
  const [loading, setLoading] = useState(false);
  const [screen, setScreen] = useState<{
    width: number;
    height: number;
    dpr: number;
  } | null>(null);

  const inFlight = useRef(false);
  const doneRef = useRef(false);
  doneRef.current = done;
  const cursorRef = useRef<Cursor>(null);

  useEffect(() => {
    if (resetKey == null) return;
    setItems([]);
    setDone(false);
    doneRef.current = false;
    inFlight.current = false;
    cursorRef.current = null;
  }, [resetKey]);

  const loadMore = useCallback(async () => {
    if (inFlight.current || doneRef.current) return 0;
    inFlight.current = true;
    setLoading(true);

    try {
      const data = await getPortfolioArtworksPage({
        take: 60,
        cursor: cursorRef.current,
        filters: queryFilters,
        onlyPublished: true,
      });

      // Defensive dedupe
      setItems((prev) => {
        const seen = new Set(prev.map((x) => x.id));
        const next = data.items.filter((x) => !seen.has(x.id));
        return prev.concat(next);
      });

      cursorRef.current = data.nextCursor;
      if (!data.nextCursor) setDone(true);

      return data.items.length;
    } finally {
      setLoading(false);
      inFlight.current = false;
    }
  }, [queryFilters]);

  useEffect(() => {
    void loadMore();
  }, [loadMore]);

  useEffect(() => {
    const update = () => {
      setScreen({
        width: window.innerWidth,
        height: window.innerHeight,
        dpr: window.devicePixelRatio || 1,
      });
    };

    update();
    window.addEventListener("resize", update);
    window.addEventListener("orientationchange", update);
    return () => {
      window.removeEventListener("resize", update);
      window.removeEventListener("orientationchange", update);
    };
  }, []);

  const galleryItems: JustifiedGalleryItem[] = items.map((it) => ({
    id: it.id,
    name: it.name,
    altText: it.altText,
    fileKey: it.fileKey,
    width: it.thumbW,
    height: it.thumbH,
    dominantHex: it.dominantHex,
  }));

  // useEffect(() => {
  //   if (items.length === 0) return;
  //   // Debug: inspect dominantHex values coming from the server.
  //   console.log(
  //     "[PortfolioGallery] dominantHex sample",
  //     items.slice(0, 5).map((it) => ({
  //       id: it.id,
  //       dominantHex: it.dominantHex,
  //     }))
  //   );
  // }, [items]);

  if (!loading && done && galleryItems.length === 0) {
    return (
      <p className="text-muted-foreground text-center py-20">
        No artworks to display
      </p>
    );
  }

  return (
    <div className="relative w-full">
      {screen ? (
        <div className="pointer-events-none absolute right-2 top-2 z-10 rounded border border-border/60 bg-background/80 px-2 py-1 text-[11px] font-mono text-muted-foreground shadow-sm">
          Screen {screen.width} × {screen.height} · {screen.dpr}x
        </div>
      ) : null}
      <JustifiedGallery
        items={galleryItems}
        hrefFrom="portfolio"
        showCaption={false}
        debug={false}
        targetRowHeight={160}
        targetRowHeightMobile={160}
        maxRowHeight={300}
        maxRowItems={5}
        maxRowItemsMobile={1}
        gap={12}
        onLoadMore={done ? undefined : () => void loadMore()}
        hasMore={!done}
        isLoadingMore={loading}
      />
    </div>
  );
}