import { Coins, LockKeyhole, Trophy } from 'lucide-react';
import { type UIEvent, useEffect, useMemo, useRef, useState } from 'react';

import type {
  CreationEntryConfig,
  CreationEntryEventBannerConfig,
} from '../../services/creationEntryConfigService';
import {
  groupVisiblePlatformCreationTypes,
  type PlatformCreationTypeCard,
  type PlatformCreationTypeId,
} from '../platform-entry/platformEntryCreationTypes';

/** 底部加号创作入口页的渲染参数，最近创作用作品架摘要推导模板入口。 */
type CustomWorldCreationStartCardProps = {
  busy?: boolean;
  entryConfig: CreationEntryConfig;
  creationTypes: readonly PlatformCreationTypeCard[];
  recentCreationTypeIds?: readonly PlatformCreationTypeId[];
  recentWindowDays?: number;
  onCreateType: (type: PlatformCreationTypeId) => void;
};

/** 创作入口公告卡兼容结构化和 HTML 两种后台配置。 */
type CreationEventBannerCard = CreationEntryEventBannerConfig;
const CREATION_ENTRY_BANNER_AUTOPLAY_MS = 4200;
const CREATION_ENTRY_RECENT_TAB_ID = '__recent_creation__';

/** 判断模板 badge 是否需要展示，普通可创建态不额外占用卡片空间。 */
function shouldShowCreationBadge(badge: string) {
  const normalizedBadge = badge.trim();
  return normalizedBadge !== '可创建' && normalizedBadge !== '可创作';
}

/** 从后端入口配置中解析创作入口公告位，保留旧单条字段兜底。 */
function resolveCreationEntryEventBanners(
  entryConfig: CreationEntryConfig,
): CreationEventBannerCard[] {
  const configuredBanners = Array.isArray(entryConfig.eventBanners)
    ? entryConfig.eventBanners.filter((banner) => banner.title.trim())
    : [];
  return configuredBanners.length > 0
    ? configuredBanners
    : [entryConfig.eventBanner];
}

/** 渲染创作入口公告位当前页指示点。 */
function CreationEntryBannerPager({
  banners,
  activeBannerIndex,
}: {
  banners: readonly CreationEventBannerCard[];
  activeBannerIndex: number;
}) {
  return (
    <div
      className="creation-event-banner__pager flex items-center justify-center gap-1.5"
      aria-hidden="true"
    >
      {banners.map((dotBanner, dotIndex) => (
        <span
          key={`${dotBanner.title}:dot:${dotIndex}`}
          className={
            dotIndex === activeBannerIndex
              ? 'h-1.5 w-5 rounded-full bg-[#d9793f]'
              : 'h-1.5 w-1.5 rounded-full bg-[#eadfd7]'
          }
        />
      ))}
    </div>
  );
}

/** 渲染底部加号进入的创作入口页，包括后台公告位和模板分类。 */
export function CustomWorldCreationStartCard({
  busy = false,
  entryConfig,
  creationTypes,
  recentCreationTypeIds = [],
  recentWindowDays = 7,
  onCreateType,
}: CustomWorldCreationStartCardProps) {
  const creationTypeGroups = useMemo(
    () => groupVisiblePlatformCreationTypes(creationTypes),
    [creationTypes],
  );
  const recentCreationTypes = useMemo(() => {
    const creationTypeById = new Map(
      creationTypes
        .filter((item) => !item.hidden)
        .map((item) => [item.id, item] as const),
    );
    return [...new Set(recentCreationTypeIds)]
      .map((id) => creationTypeById.get(id))
      .filter((item): item is PlatformCreationTypeCard => Boolean(item));
  }, [creationTypes, recentCreationTypeIds]);
  const [activeCategoryId, setActiveCategoryId] = useState<string | null>(null);
  const hasRecentCreationTypes = recentCreationTypes.length > 0;
  const activeTabId =
    activeCategoryId ??
    (hasRecentCreationTypes
      ? CREATION_ENTRY_RECENT_TAB_ID
      : (creationTypeGroups[0]?.id ?? null));
  const isRecentTabActive =
    hasRecentCreationTypes && activeTabId === CREATION_ENTRY_RECENT_TAB_ID;
  const activeGroup = isRecentTabActive
    ? null
    : (creationTypeGroups.find((group) => group.id === activeTabId) ??
      creationTypeGroups[0] ??
      null);
  const visibleCreationTypes = isRecentTabActive
    ? recentCreationTypes
    : (activeGroup?.items ?? []);
  const eventBanners = useMemo(
    () => resolveCreationEntryEventBanners(entryConfig),
    [entryConfig],
  );
  const [activeBannerIndex, setActiveBannerIndex] = useState(0);
  const bannerTrackRef = useRef<HTMLDivElement | null>(null);

  useEffect(() => {
    setActiveBannerIndex(0);
  }, [eventBanners.length]);

  useEffect(() => {
    if (hasRecentCreationTypes) {
      return;
    }

    setActiveCategoryId((currentId) =>
      currentId === CREATION_ENTRY_RECENT_TAB_ID ? null : currentId,
    );
  }, [hasRecentCreationTypes]);

  useEffect(() => {
    if (eventBanners.length <= 1) {
      return undefined;
    }

    const intervalId = window.setInterval(() => {
      setActiveBannerIndex((currentIndex) => {
        const nextIndex = (currentIndex + 1) % eventBanners.length;
        const track = bannerTrackRef.current;
        if (track && typeof track.scrollTo === 'function') {
          track.scrollTo({
            left: track.clientWidth * nextIndex,
            behavior: 'smooth',
          });
        }
        return nextIndex;
      });
    }, CREATION_ENTRY_BANNER_AUTOPLAY_MS);

    return () => window.clearInterval(intervalId);
  }, [eventBanners.length]);

  /** 同步手势滑动后的 banner 页码，避免自动轮播和手动滑动状态错位。 */
  function handleBannerScroll(event: UIEvent<HTMLDivElement>) {
    const { clientWidth, scrollLeft } = event.currentTarget;
    if (clientWidth <= 0) {
      return;
    }

    const nextIndex = Math.max(
      0,
      Math.min(eventBanners.length - 1, Math.round(scrollLeft / clientWidth)),
    );
    setActiveBannerIndex((currentIndex) =>
      currentIndex === nextIndex ? currentIndex : nextIndex,
    );
  }

  return (
    <div className="mx-auto flex w-full max-w-5xl flex-col gap-3 sm:gap-5">
      <section className="creation-event-banner relative overflow-hidden rounded-[1.35rem] border border-[#f0d8ca] bg-[#fff8f3] shadow-[0_16px_36px_rgba(174,111,73,0.12)] sm:rounded-[1.65rem]">
        <div
          ref={bannerTrackRef}
          className="creation-event-banner__track flex snap-x snap-mandatory overflow-x-auto overscroll-x-contain touch-pan-x scrollbar-hide"
          onScroll={handleBannerScroll}
          aria-label="创作公告横幅"
        >
          {eventBanners.map((banner, index) => {
            const prizePoolText =
              banner.prizePoolMudPoints.toLocaleString('zh-CN');
            const shouldRenderHtmlBanner =
              banner.renderMode === 'html' && Boolean(banner.htmlCode?.trim());

            return (
              <article
                key={`${banner.title}:${index}`}
                className="creation-event-banner__slide relative w-full shrink-0 snap-center overflow-hidden"
              >
                {shouldRenderHtmlBanner ? (
                  <div className="relative min-h-[12rem] sm:min-h-[15rem]">
                    <iframe
                      title={banner.title}
                      sandbox=""
                      srcDoc={banner.htmlCode ?? ''}
                      className="absolute inset-0 h-full w-full border-0 bg-transparent"
                    />
                  </div>
                ) : (
                  <>
                    <img
                      src={banner.coverImageSrc}
                      alt=""
                      className="absolute inset-y-0 right-0 h-full w-[58%] object-cover object-[70%_center] opacity-95"
                      loading={index === 0 ? 'eager' : 'lazy'}
                    />
                    <div className="absolute inset-0 bg-[linear-gradient(90deg,#fff8f3_0%,rgba(255,248,243,0.94)_34%,rgba(255,248,243,0.36)_68%,rgba(255,248,243,0.08)_100%)]" />
                    <div className="relative z-10 flex min-h-[12rem] flex-col justify-between px-4 py-4 sm:min-h-[15rem] sm:px-7 sm:py-6">
                      <div className="w-[68%] min-w-0 sm:w-[56%]">
                        <div className="inline-flex max-w-full items-center gap-1.5 rounded-full border border-[#df7949] bg-white/72 px-2.5 py-1 text-xs font-black text-[#cf6332] shadow-sm">
                          <Trophy className="h-3.5 w-3.5 shrink-0" />
                          <span className="truncate">{banner.title}</span>
                        </div>
                        <div className="mt-3 line-clamp-2 text-sm font-semibold leading-5 text-[#695143] sm:mt-5 sm:leading-6">
                          {banner.description}
                        </div>
                        <div className="mt-3 inline-flex max-w-full items-center gap-1.5 rounded-full bg-white/72 px-2.5 py-1.5 text-xs font-bold text-[#6f5140] shadow-sm">
                          <span className="grid h-5 w-5 place-items-center rounded-full bg-[#ffb64c] text-white">
                            <Coins className="h-3 w-3" />
                          </span>
                          <span className="shrink-0">奖池</span>
                          <span className="text-sm font-black text-[#d36b2f]">
                            {prizePoolText}
                          </span>
                          <span className="shrink-0">泥点数</span>
                        </div>
                      </div>

                      <div className="mt-4 flex flex-col gap-2">
                        <div className="creation-event-banner__timebar flex min-w-0 items-center justify-center gap-1.5 rounded-full border border-[#e9c5b0] bg-white/72 px-2.5 py-1.5 text-center text-[10px] font-bold text-[#9a5a39] shadow-[0_8px_18px_rgba(174,111,73,0.1)] sm:gap-2 sm:px-5 sm:py-2.5 sm:text-[11px]">
                          <span className="min-w-0 truncate">
                            开始时间&nbsp;&nbsp;{banner.startsAtText}
                          </span>
                          <span className="shrink-0 text-[#c99373]">|</span>
                          <span className="min-w-0 truncate">
                            结束时间&nbsp;&nbsp;{banner.endsAtText}
                          </span>
                        </div>
                        <CreationEntryBannerPager
                          banners={eventBanners}
                          activeBannerIndex={activeBannerIndex}
                        />
                      </div>
                    </div>
                  </>
                )}
                {shouldRenderHtmlBanner ? (
                  <div className="absolute inset-x-0 bottom-3 z-10">
                    <CreationEntryBannerPager
                      banners={eventBanners}
                      activeBannerIndex={activeBannerIndex}
                    />
                  </div>
                ) : null}
              </article>
            );
          })}
        </div>
      </section>

      <section className="creation-template-list -mx-1 px-1 sm:-mx-2 sm:px-2">
        <div
          className="-mx-0.5 flex snap-x items-center gap-2 overflow-x-auto px-0.5 pb-1 scrollbar-hide scroll-px-2 sm:gap-3"
          role="tablist"
          aria-label="创作入口页签"
        >
          {hasRecentCreationTypes ? (
            <button
              type="button"
              role="tab"
              aria-selected={isRecentTabActive}
              onClick={() => setActiveCategoryId(CREATION_ENTRY_RECENT_TAB_ID)}
              className={`relative min-h-8 shrink-0 rounded-full px-2.5 text-xs font-black transition sm:min-h-9 sm:px-3.5 sm:text-sm ${
                isRecentTabActive
                  ? 'text-[#6f2f21]'
                  : 'text-[#7a6558] hover:text-[#6f2f21]'
              }`}
            >
              <span>最近创作</span>
              {isRecentTabActive ? (
                <span className="absolute bottom-0 left-3 right-3 h-1 rounded-full bg-[#d9793f]" />
              ) : null}
            </button>
          ) : null}
          {creationTypeGroups.map((group) => {
            const selected = group.id === activeGroup?.id;
            return (
              <button
                key={group.id}
                type="button"
                role="tab"
                aria-selected={selected}
                onClick={() => setActiveCategoryId(group.id)}
                className={`relative min-h-8 shrink-0 rounded-full px-2.5 text-xs font-black transition sm:min-h-9 sm:px-3.5 sm:text-sm ${
                  selected
                    ? 'text-[#6f2f21]'
                    : 'text-[#7a6558] hover:text-[#6f2f21]'
                }`}
              >
                <span>{group.label}</span>
                {selected ? (
                  <span className="absolute bottom-0 left-3 right-3 h-1 rounded-full bg-[#d9793f]" />
                ) : null}
              </button>
            );
          })}
        </div>

        {isRecentTabActive ? (
          <div className="creation-template-list__recent-window mt-2 text-[11px] font-bold leading-4 text-[#8b6654] sm:text-xs">
            仅显示最近{recentWindowDays}天内使用过的模板
          </div>
        ) : null}

        <div className="creation-template-list__grid mt-2 grid grid-cols-2 gap-2 sm:mt-3 sm:gap-3">
          {visibleCreationTypes.map((item) => {
            const disabled = item.locked || busy;
            const lockedBadge = item.badge.trim() || '暂未开放';

            return (
              <button
                key={item.id}
                type="button"
                disabled={disabled}
                data-locked={item.locked ? 'true' : undefined}
                onClick={() => {
                  onCreateType(item.id);
                }}
                className={`creation-template-card platform-interactive-card relative flex min-h-[12.5rem] flex-col overflow-hidden rounded-[1rem] border bg-white p-0 text-left transition sm:min-h-[15rem] sm:rounded-[1.2rem] ${
                  item.locked
                    ? 'cursor-not-allowed border-[#d9ccc2] text-[#725b4d] shadow-[inset_0_0_0_1px_rgba(111,78,61,0.08)]'
                    : 'border-[#eadbd3] text-[#2f211b] hover:border-[#dc9a72] hover:shadow-[0_16px_34px_rgba(174,111,73,0.14)]'
                } ${busy && !item.locked ? 'opacity-70' : ''}`}
              >
                <div className="creation-template-card__media relative aspect-[1.32/1] w-full overflow-hidden bg-[#f7ebe3]">
                  <img
                    src={item.imageSrc}
                    alt=""
                    className={`h-full w-full object-cover ${
                      item.locked
                        ? 'scale-[1.01] grayscale-[0.62] saturate-[0.55] brightness-[0.82]'
                        : ''
                    }`}
                    loading="lazy"
                  />
                  {item.locked ? (
                    <div className="absolute inset-0 bg-[linear-gradient(180deg,rgba(52,36,27,0.22)_0%,rgba(52,36,27,0.52)_100%)]" />
                  ) : null}
                  {item.locked || shouldShowCreationBadge(item.badge) ? (
                    <span
                      className={`absolute left-2 top-2 inline-flex max-w-[calc(100%-1rem)] items-center gap-1 rounded-full px-2 py-0.5 text-xs font-black shadow-sm sm:left-3 sm:top-3 sm:px-2.5 sm:py-1 ${
                        item.locked
                          ? 'bg-[#3f3129]/90 text-white'
                          : 'bg-[#b66a3e] text-white'
                      }`}
                    >
                      {item.locked ? <LockKeyhole className="h-3 w-3" /> : null}
                      {item.locked ? lockedBadge : item.badge}
                    </span>
                  ) : null}
                  {item.locked ? (
                    <span className="absolute left-1/2 top-1/2 inline-flex h-11 w-11 -translate-x-1/2 -translate-y-1/2 items-center justify-center rounded-full bg-white/88 text-[#5d4639] shadow-[0_12px_24px_rgba(46,31,23,0.22)]">
                      <LockKeyhole className="h-5 w-5" />
                    </span>
                  ) : null}
                  <span
                    className={`creation-template-card__cost-badge absolute bottom-2 right-2 inline-flex max-w-[calc(100%-1rem)] items-center gap-1 rounded-full px-2 py-1 text-[11px] font-black leading-4 shadow-[0_8px_18px_rgba(119,72,44,0.16)] ${
                      item.locked
                        ? 'bg-[#3f3129]/88 text-white'
                        : 'bg-[#fff7ec]/92 text-[#b65f2c]'
                    }`}
                  >
                    {item.locked ? (
                      <LockKeyhole className="h-3 w-3 shrink-0" />
                    ) : (
                      <Coins className="h-3 w-3 shrink-0" />
                    )}
                    <span className="truncate">
                      {item.locked ? '暂未开放' : item.mudPointCostLabel}
                    </span>
                  </span>
                </div>

                <div
                  className={`creation-template-card__body flex min-h-[4.6rem] flex-1 flex-col px-2.5 pb-2.5 pt-2.5 sm:min-h-[5.4rem] sm:px-3.5 sm:pb-3.5 ${
                    item.locked
                      ? 'bg-[#f3ece6] text-[#725b4d]'
                      : 'bg-white text-[#2f211b]'
                  }`}
                >
                  <div
                    className={`creation-template-card__title line-clamp-1 text-sm font-black leading-5 ${
                      item.locked ? 'text-[#5d4639]' : 'text-[#2f211b]'
                    }`}
                  >
                    {item.title}
                  </div>
                  <div
                    className={`creation-template-card__subtitle mt-1 line-clamp-2 text-xs font-semibold leading-4 sm:leading-5 ${
                      item.locked ? 'text-[#8a766a]' : 'text-[#6f5a4c]'
                    }`}
                  >
                    {item.subtitle}
                  </div>
                </div>
              </button>
            );
          })}
        </div>
      </section>
    </div>
  );
}