/**
 * 가요 다방 — 턴테이블 하나 + 도넛판 캐러셀.
 *
 * 판을 누르면 톤암이 내려오고 판이 돈다. 가사를 못 싣는 제약(DB_Guide: 원문 전재 금지)을
 * 숨기지 않고 라벨 아래 각인으로 드러낸다 — 제약이 곧 이 아이템의 인상이다.
 */
import {useState} from 'react';
import {SectionBody, SectionFrame} from '../../primitives';
import type {SectionRenderProps} from '../../types';
import {parseSectionData, type SongItem} from '../../dataSpec';
import {
  CarouselNav,
  ParseError,
  PasteHint,
  RETRO_BODY,
  RETRO_SIGN,
  SourceLine,
  useCarousel,
} from '../retro/common';
import '../retro/retro.css';

const FALLBACK_LABEL = '#d4551f';

export function SongsTurntable(props: SectionRenderProps) {
  const {section, isSelected, onSelect, template} = props;
  const parsed = parseSectionData<SongItem>(section.type, section.data);
  const [playing, setPlaying] = useState(0);
  const {ref, scrollBy} = useCarousel<HTMLDivElement>();

  // 항목이 줄어 인덱스가 범위를 벗어나도 첫 곡으로 떨어진다 — 빈 화면을 만들지 않는다.
  const current = parsed.items[playing] ?? parsed.items[0];

  return (
    <SectionFrame section={section} isSelected={isSelected} onSelect={onSelect} tone="dark">
      <SectionBody width="wide">
        <div className="space-y-1.5">
          <p className="text-[11px] tracking-[0.28em] text-amber-500/90">33⅓ RPM</p>
          <h2 className="text-2xl text-stone-50 sm:text-3xl" style={{fontFamily: RETRO_SIGN}}>
            {parsed.title || section.name}
          </h2>
          {(parsed.subtitle || section.description) && (
            <p className="text-sm text-stone-400" style={{fontFamily: RETRO_BODY}}>
              {parsed.subtitle || section.description}
            </p>
          )}
        </div>

        {parsed.error ? (
          <ParseError message={parsed.error} />
        ) : !current ? (
          <PasteHint label="가요 다방" />
        ) : (
          <>
            <div className="grid items-center gap-8 border border-stone-700/60 bg-linear-160 from-stone-800 to-stone-900 p-6 sm:p-8 md:grid-cols-[260px_minmax(0,1fr)]">
              {/* 턴테이블 */}
              <div className="relative mx-auto size-[240px]">
                <div className="absolute inset-0 rounded-full bg-radial from-stone-700 from-32% to-stone-800 shadow-[0_10px_26px_rgba(0,0,0,.5)]" />
                <div
                  className="w4-disc w4-spin absolute inset-2 rounded-full"
                  style={{['--lbl' as string]: current.labelColor || FALLBACK_LABEL}}
                >
                  <div className="w4-disc-sheen absolute inset-0 rounded-full" />
                  <div className="absolute left-1/2 top-1/2 size-2.5 -translate-x-1/2 -translate-y-1/2 rounded-full bg-stone-700" />
                </div>
                {/* 톤암 — 곡이 얹혀 있으니 항상 내려와 있다. */}
                <div className="absolute -right-1 top-3 h-2 w-[120px] origin-right rotate-6">
                  <div className="absolute inset-y-[3px] right-4 left-0 rounded-sm bg-linear-to-b from-stone-300 to-stone-500" />
                  <div className="absolute left-0 -top-1 h-4 w-4 rounded-sm bg-stone-700" />
                  <div className="absolute -top-2 right-0 size-6 rounded-full bg-radial from-stone-300 to-stone-600" />
                </div>
              </div>

              {/* 지금 도는 곡 */}
              <div className="min-w-0 space-y-3">
                <p className="text-[10px] tracking-[0.24em] text-amber-500/90">
                  A면 · {playing + 1} / {parsed.items.length}
                </p>
                <h3 className="text-2xl text-stone-50 sm:text-3xl" style={{fontFamily: RETRO_SIGN}}>
                  {current.title}
                </h3>
                <p className="text-xs text-stone-400">
                  {[
                    current.artist,
                    current.year ? String(current.year) : undefined,
                    current.lyricist || current.composer
                      ? `작사 ${current.lyricist ?? '미상'} / 작곡 ${current.composer ?? '미상'}`
                      : undefined,
                    current.label,
                  ]
                    .filter(Boolean)
                    .join(' · ')}
                </p>
                {current.story && (
                  <p
                    className="max-w-[46ch] text-sm leading-relaxed text-stone-300"
                    style={{fontFamily: RETRO_BODY}}
                  >
                    {current.story}
                  </p>
                )}
                {current.connection && (
                  <p
                    className="max-w-[46ch] text-sm leading-relaxed"
                    style={{fontFamily: RETRO_BODY, color: template.colors.accent}}
                  >
                    {current.connection}
                  </p>
                )}
                <span className="inline-block border border-dashed border-stone-600 px-2 py-1 text-[10px] tracking-[0.1em] text-stone-400">
                  ◎ 가사 대신 이야기 — 원문은 싣지 않습니다
                </span>
                <SourceLine source={current.source} verified={current.verified} tone="dark" />
              </div>
            </div>

            {/* 판 고르기 */}
            <div className="space-y-2">
              <div ref={ref} className="w4-scroll flex snap-x snap-mandatory gap-4 overflow-x-auto pb-2">
                {parsed.items.map((song, index) => (
                  <button
                    key={`${song.title}-${index}`}
                    type="button"
                    onClick={(event) => {
                      event.stopPropagation();
                      setPlaying(index);
                    }}
                    aria-current={index === playing}
                    className="w-24 shrink-0 snap-center text-center"
                  >
                    <span
                      className="w4-disc-mini mx-auto block size-[84px] rounded-full transition-transform hover:scale-105"
                      style={{
                        ['--lbl' as string]: song.labelColor || FALLBACK_LABEL,
                        boxShadow:
                          index === playing
                            ? '0 0 0 2px #c9930f, 0 3px 10px rgba(0,0,0,.45)'
                            : undefined,
                      }}
                    />
                    <span className="mt-2 block truncate text-[10px] leading-tight text-stone-400">
                      {song.title}
                    </span>
                  </button>
                ))}
              </div>
              {parsed.items.length > 3 && (
                <CarouselNav
                  onPrev={() => scrollBy(-1)}
                  onNext={() => scrollBy(1)}
                  tone="dark"
                  label="곡"
                />
              )}
            </div>
          </>
        )}
      </SectionBody>
    </SectionFrame>
  );
}