import { Check, ImageIcon, Music, Search, Video } from 'lucide-react';
import { type ReactNode, useEffect, useMemo, useState } from 'react';

import { PlatformActionButton } from '../../../packages/shared/src/components/PlatformActionButton';
import { PlatformResourceFilterBar } from '../../../packages/shared/src/components/PlatformResourceFilterBar';
import { PlatformStatusMessage } from '../../../packages/shared/src/components/PlatformStatusMessage';
import { UnifiedModal } from '../common/UnifiedModal';
import type { EditorAsset } from './ImageCanvasEditorTypes';
import {
  PROJECT_ASSET_PICKER_CATEGORY_OPTIONS,
  projectAssetMatchesPickerFilter,
  type ProjectAssetPickerCategory,
  projectAssetPickerCategory,
} from './projectAssetReferencePickerModel';

type ImageCanvasProjectAssetPickerDialogProps = {
  open: boolean;
  /** 项目已登记素材；弹窗只负责选择，不改素材本身。 */
  assets: readonly EditorAsset[];
  /** 打开时的初始选择，取消时原选择保持不变。 */
  selectedAssetIds: readonly string[];
  onCancel: () => void;
  onConfirm: (assetIds: string[]) => void;
  /**
   * 单选模式：点击即整组替换当前选择，不再渲染「已选」chip 行。
   * 默认 `false`，网页端美术画布的参考图多选行为逐字不变。
   */
  singleSelect?: boolean;
  /**
   * 被禁用的素材 id → 用户可见的禁用原因。默认空，即所有素材都可选。
   *
   * 禁用项仍然渲染（不隐藏）：隐藏会让用户以为"素材不存在"，而真实原因是它不可替换。
   */
  assetBlockedReasons?: Readonly<Record<string, string>>;
  /**
   * 可选素材 id → 非阻断提示（例如"格式与源素材不同"）。默认空，即不显示任何提示。
   *
   * 与 `assetBlockedReasons` 的区别：提示不改变可点性，只把差异说清楚。
   */
  assetHints?: Readonly<Record<string, string>>;
  /**
   * 素材缩略图渲染器。默认 `undefined` → 沿用 `<img src={thumbnailSrc || src}>`。
   *
   * 宿主（如 AGC 资源工作台）没有同步 `src` 时必须传它：AGC 的预览读取走带 scope 的
   * 原生调度器 + Blob URL，弹窗内取不到，直接给空 `src` 会挂破图。
   */
  renderAssetMedia?: (asset: EditorAsset) => ReactNode;
  /**
   * 选择对象的中文名词，用于拼弹窗标题与可访问名称。默认「参考图」，
   * 即网页端美术画布的现有文案逐字不变。
   */
  selectionNoun?: string;
  /**
   * 宿主的失败原因（例如后端拒绝了这次替换）。默认 `undefined` → 不渲染。
   *
   * 用于在弹窗内说明"为什么这次操作没成功"，而不是静默关闭弹窗让用户以为成功了。
   */
  errorMessage?: string | null;
};

function assetIcon(asset: EditorAsset) {
  const category = projectAssetPickerCategory(asset);
  if (category === 'video') {
    return <Video className="h-4 w-4" aria-hidden="true" />;
  }
  if (category === 'audio') {
    return <Music className="h-4 w-4" aria-hidden="true" />;
  }
  return <ImageIcon className="h-4 w-4" aria-hidden="true" />;
}

/**
 * 参考图选择弹窗。
 *
 * 画布筛选条在这里被完整复用，但筛选状态由本弹窗自己持有，
 * 与资源画布、`@` 面板互不影响。确认时只回传素材 id 列表，
 * 由调用方把 id 快照写进本次提交数据。
 */
export function ImageCanvasProjectAssetPickerDialog({
  open,
  assets,
  selectedAssetIds,
  onCancel,
  onConfirm,
  singleSelect = false,
  assetBlockedReasons,
  assetHints,
  renderAssetMedia,
  selectionNoun = '参考图',
  errorMessage,
}: ImageCanvasProjectAssetPickerDialogProps) {
  const [query, setQuery] = useState('');
  const [category, setCategory] = useState<ProjectAssetPickerCategory>('all');
  const [selection, setSelection] = useState<string[]>([]);

  // 每次打开都从调用方给的初始选择重新开始，取消不写回。
  useEffect(() => {
    if (!open) return;
    setQuery('');
    setCategory('all');
    setSelection([...selectedAssetIds]);
  }, [open, selectedAssetIds]);

  const visibleAssets = useMemo(
    () =>
      assets.filter((asset) =>
        projectAssetMatchesPickerFilter(asset, { category, query }),
      ),
    [assets, category, query],
  );
  const assetById = useMemo(
    () => new Map(assets.map((asset) => [asset.id, asset])),
    [assets],
  );
  const selectedAssets = selection.flatMap((assetId) => {
    const asset = assetById.get(assetId);
    return asset ? [asset] : [];
  });

  function toggleAsset(assetId: string) {
    if (assetBlockedReasons?.[assetId]) return;
    setSelection((current) => {
      if (singleSelect) {
        return current.includes(assetId) ? [] : [assetId];
      }
      return current.includes(assetId)
        ? current.filter((item) => item !== assetId)
        : [...current, assetId];
    });
  }

  return (
    <UnifiedModal
      open={open}
      title={`选择${selectionNoun}`}
      size="lg"
      portalTheme="light"
      closeLabel={`关闭选择${selectionNoun}`}
      onClose={onCancel}
      panelClassName="image-canvas-editor__project-asset-picker"
      bodyClassName="image-canvas-editor__project-asset-picker-body"
      footer={
        <>
          <span className="mr-auto text-xs text-[var(--platform-text-base)]">
            已选 {selection.length} 个
          </span>
          <PlatformActionButton
            type="button"
            tone="secondary"
            size="sm"
            disabled={selection.length === 0}
            onClick={() => setSelection([])}
          >
            清空
          </PlatformActionButton>
          <PlatformActionButton
            type="button"
            tone="secondary"
            size="sm"
            onClick={onCancel}
          >
            取消
          </PlatformActionButton>
          <PlatformActionButton
            type="button"
            size="sm"
            aria-label={`确认选择${selectionNoun}`}
            onClick={() => onConfirm(selection)}
          >
            确认
          </PlatformActionButton>
        </>
      }
    >
      {errorMessage ? (
        <PlatformStatusMessage
          tone="error"
          size="xs"
          className="mb-3"
          role="alert"
        >
          {errorMessage}
        </PlatformStatusMessage>
      ) : null}
      {selectedAssets.length > 0 && !singleSelect ? (
        <div
          className="mb-3 flex flex-wrap gap-1.5"
          aria-label={`已选${selectionNoun}`}
        >
          {selectedAssets.map((asset) => (
            <button
              key={asset.id}
              type="button"
              aria-label={`取消${selectionNoun}${asset.label}`}
              className="platform-category-chip gap-1 px-2 text-xs"
              onClick={() => toggleAsset(asset.id)}
            >
              {assetIcon(asset)}
              <span>{asset.label}</span>
            </button>
          ))}
        </div>
      ) : null}
      <PlatformResourceFilterBar
        ariaLabel="参考图筛选"
        search={{
          value: query,
          label: '搜索参考图素材',
          placeholder: '搜索素材名称',
          onChange: setQuery,
        }}
        categoryItems={PROJECT_ASSET_PICKER_CATEGORY_OPTIONS}
        activeCategoryId={category}
        onCategoryChange={(nextCategory) => setCategory(nextCategory)}
        className="mb-3"
      />
      {visibleAssets.length === 0 ? (
        <p className="py-6 text-center text-sm text-[var(--platform-text-base)]">
          {assets.length === 0 ? '当前项目还没有已登记素材' : '没有匹配的素材'}
        </p>
      ) : (
        <div
          className="grid grid-cols-2 gap-2 sm:grid-cols-3 lg:grid-cols-4"
          role="listbox"
          aria-label={`${selectionNoun}素材`}
          aria-multiselectable={!singleSelect}
        >
          {visibleAssets.map((asset) => {
            const selected = selection.includes(asset.id);
            const blockedReason = assetBlockedReasons?.[asset.id] ?? null;
            const hint = blockedReason
              ? null
              : (assetHints?.[asset.id] ?? null);
            return (
              <button
                key={asset.id}
                type="button"
                role="option"
                aria-selected={selected}
                aria-label={`选择${selectionNoun}${asset.label}`}
                disabled={blockedReason !== null}
                title={blockedReason ?? hint ?? undefined}
                className={[
                  'relative flex min-h-[7.5rem] flex-col overflow-hidden rounded-[0.9rem] border text-left transition',
                  selected
                    ? 'border-[var(--platform-accent)] bg-white shadow-sm'
                    : 'border-[var(--platform-subpanel-border)] bg-white/70 hover:bg-white',
                  // 禁用项的"变灰"只压在缩略图与名称上，**不压禁用原因**：
                  // 「分类不同」这类小字压在整卡 `opacity-60` 下几乎读不出来，而它恰恰是
                  // 用户唯一能看到的解释。视觉上的禁用感由缩略图与名称承担。
                  blockedReason !== null ? 'cursor-not-allowed' : '',
                ]
                  .filter(Boolean)
                  .join(' ')}
                onClick={() => toggleAsset(asset.id)}
              >
                <span
                  className={[
                    'flex h-20 w-full items-center justify-center overflow-hidden bg-white/60',
                    blockedReason !== null ? 'opacity-50' : '',
                  ]
                    .filter(Boolean)
                    .join(' ')}
                >
                  {renderAssetMedia ? (
                    renderAssetMedia(asset)
                  ) : projectAssetPickerCategory(asset) === 'image' ? (
                    <img
                      src={asset.thumbnailSrc || asset.src}
                      alt=""
                      className="h-full w-full object-cover"
                    />
                  ) : (
                    assetIcon(asset)
                  )}
                </span>
                <span
                  className={[
                    'flex min-w-0 items-center gap-1 px-2 py-1.5',
                    blockedReason !== null ? 'opacity-60' : '',
                  ]
                    .filter(Boolean)
                    .join(' ')}
                >
                  <span className="min-w-0 flex-1 truncate text-xs font-bold text-[var(--platform-text-strong)]">
                    {asset.label}
                  </span>
                  {selected ? (
                    <Check
                      className="h-3.5 w-3.5 shrink-0"
                      aria-hidden="true"
                    />
                  ) : null}
                </span>
                {blockedReason !== null ? (
                  <span className="block px-2 pb-1.5 text-[0.6875rem] leading-snug font-medium text-[var(--platform-text-strong)]">
                    {blockedReason}
                  </span>
                ) : hint !== null ? (
                  <span className="block px-2 pb-1.5 text-[0.6875rem] leading-snug text-[var(--platform-text-base)]">
                    {hint}
                  </span>
                ) : null}
              </button>
            );
          })}
        </div>
      )}
      {visibleAssets.length > 0 ? (
        <p className="mt-2 text-center text-xs text-[var(--platform-text-base)]">
          <Search className="mr-1 inline h-3 w-3" aria-hidden="true" />
          {visibleAssets.length} / {assets.length}
        </p>
      ) : null}
    </UnifiedModal>
  );
}