import {
  type Dispatch,
  type PointerEvent as ReactPointerEvent,
  type RefObject,
  type SetStateAction,
  useCallback,
  useEffect,
  useMemo,
  useState,
} from 'react';

import { ApiClientError } from '../../services/apiClient';
import {
  createEditorAssetFolder,
  deleteEditorAsset,
  deleteEditorAssetFolder,
  loadEditorAssetLibrary,
  updateEditorAsset,
  updateEditorAssetFolder,
} from '../../services/image-editor/editorProjectClient';
import {
  EDITOR_ASSET_FOLDERS,
  escapeCssIdentifier,
  normalizeAssetLibrary,
} from './ImageCanvasEditorModel';
import type {
  AssetMarqueeState,
  AssetPointerDragState,
  EditorAsset,
  EditorAssetFolder,
} from './ImageCanvasEditorTypes';
export { readImageFileAsDataUrl } from './ImageCanvasFileModel';

function isEditorAuthError(error: unknown) {
  return (
    error instanceof ApiClientError &&
    (error.status === 401 || error.status === 403)
  );
}

export function useImageCanvasAssetLibrary({
  assetListRef,
  canAccessProtectedData,
  openEditorLoginModal,
  onDeleteAssets,
}: {
  assetListRef: RefObject<HTMLDivElement | null>;
  canAccessProtectedData: boolean;
  openEditorLoginModal: (postLoginAction?: (() => void) | null) => void;
  onDeleteAssets?: (assets: EditorAsset[]) => void;
}) {
  const [assetFolders, setAssetFolders] =
    useState<EditorAssetFolder[]>(EDITOR_ASSET_FOLDERS);
  const [assets, setAssets] = useState<EditorAsset[]>([]);
  const [renamingAsset, setRenamingAsset] = useState<{
    assetId: string;
    value: string;
  } | null>(null);
  const [renamingFolder, setRenamingFolder] = useState<{
    folderId: string;
    value: string;
  } | null>(null);
  const [creatingFolder, setCreatingFolder] = useState(false);
  const [newFolderName, setNewFolderName] = useState('');
  const [activeUploadFolderId, setActiveUploadFolderId] = useState('project');
  const [isAssetSelectionMode, setIsAssetSelectionMode] = useState(false);
  const [selectedAssetIds, setSelectedAssetIds] = useState<Set<string>>(
    () => new Set(),
  );
  const [assetMarquee, setAssetMarquee] = useState<AssetMarqueeState | null>(
    null,
  );
  const [assetPointerDrag, setAssetPointerDrag] =
    useState<AssetPointerDragState | null>(null);
  const [assetMoveDropFolderId, setAssetMoveDropFolderId] = useState<
    string | null
  >(null);
  const [pinnedAssetMoveFolderId, setPinnedAssetMoveFolderId] = useState<
    string | null
  >(null);

  const groupedAssets = useMemo(
    () =>
      assetFolders.map((folder) => ({
        ...folder,
        assets: assets.filter((asset) => asset.folderId === folder.id),
      })),
    [assetFolders, assets],
  );
  const selectableAssets = useMemo(
    () => assets.filter((asset) => asset.sourceKind === 'uploaded'),
    [assets],
  );
  const allSelectableAssetsSelected =
    selectableAssets.length > 0 &&
    selectableAssets.every((asset) => selectedAssetIds.has(asset.id));

  useEffect(() => {
    if (!canAccessProtectedData) {
      return undefined;
    }
    let cancelled = false;
    loadEditorAssetLibrary()
      .then((library) => {
        if (cancelled) {
          return;
        }
        const nextLibrary = normalizeAssetLibrary(library);
        setAssetFolders(nextLibrary.folders);
        setAssets(nextLibrary.assets);
        const defaultFolder = nextLibrary.folders.find(
          (folder) => folder.systemDefault,
        );
        setActiveUploadFolderId(
          defaultFolder?.id ?? nextLibrary.folders[0]?.id ?? 'project',
        );
      })
      .catch((error: unknown) => {
        if (!cancelled && isEditorAuthError(error)) {
          openEditorLoginModal();
        }
      });
    return () => {
      cancelled = true;
    };
  }, [canAccessProtectedData, openEditorLoginModal]);

  const resolveAssetFolderId = useCallback(
    (clientX: number, clientY: number) => {
      const listElement = assetListRef.current;
      if (!listElement) {
        return null;
      }
      const listRect = listElement.getBoundingClientRect();
      if (
        clientX < listRect.left ||
        clientX > listRect.right ||
        clientY < listRect.top ||
        clientY > listRect.bottom
      ) {
        return null;
      }
      const folderElements = [
        ...listElement.querySelectorAll<HTMLElement>('[data-asset-folder-id]'),
      ];
      const matchedFolder = folderElements.find((element) => {
        const rect = element.getBoundingClientRect();
        return (
          clientX >= rect.left &&
          clientX <= rect.right &&
          clientY >= rect.top &&
          clientY <= rect.bottom
        );
      });
      return matchedFolder?.dataset.assetFolderId ?? null;
    },
    [assetListRef],
  );

  const updateAssetMoveDropFolder = useCallback(
    (folderId: string | null) => {
      setAssetMoveDropFolderId(folderId);
      if (!folderId) {
        setPinnedAssetMoveFolderId(null);
        return;
      }
      const listElement = assetListRef.current;
      const header = listElement?.querySelector<HTMLElement>(
        `[data-asset-folder-header-id="${escapeCssIdentifier(folderId)}"]`,
      );
      const listRect = listElement?.getBoundingClientRect();
      const headerRect = header?.getBoundingClientRect();
      setPinnedAssetMoveFolderId(
        listRect &&
          headerRect &&
          (headerRect.bottom < listRect.top || headerRect.top > listRect.bottom)
          ? folderId
          : null,
      );
    },
    [assetListRef],
  );

  const startRenamingAsset = useCallback((asset: EditorAsset) => {
    setRenamingAsset({
      assetId: asset.id,
      value: asset.label,
    });
  }, []);

  const commitAssetRename = useCallback(
    (asset: EditorAsset) => {
      const nextLabel = renamingAsset?.value.trim();
      if (!nextLabel) {
        setRenamingAsset(null);
        return;
      }
      setAssets((currentAssets) =>
        currentAssets.map((currentAsset) =>
          currentAsset.id === asset.id
            ? {
                ...currentAsset,
                label: nextLabel,
              }
            : currentAsset,
        ),
      );
      if (asset.persisted) {
        updateEditorAsset(asset.id, { label: nextLabel }).catch(() => {});
      }
      setRenamingAsset(null);
    },
    [renamingAsset],
  );

  const toggleAssetFolder = useCallback(
    (folderId: string) => {
      const nextFolder = assetFolders.find((folder) => folder.id === folderId);
      const nextCollapsed = !(nextFolder?.collapsed ?? false);
      setAssetFolders((currentFolders) =>
        currentFolders.map((folder) =>
          folder.id === folderId
            ? {
                ...folder,
                collapsed: !folder.collapsed,
              }
            : folder,
        ),
      );
      if (nextFolder?.persisted) {
        updateEditorAssetFolder(folderId, { collapsed: nextCollapsed }).catch(
          () => {},
        );
      }
    },
    [assetFolders],
  );

  const commitNewAssetFolder = useCallback(async () => {
    const label = newFolderName.trim();
    if (!label) {
      setCreatingFolder(false);
      setNewFolderName('');
      return;
    }
    const folderId = `folder-${Date.now()}`;
    setAssetFolders((currentFolders) => [
      ...currentFolders,
      {
        id: folderId,
        label,
        collapsed: false,
        systemDefault: false,
        persisted: false,
      },
    ]);
    setActiveUploadFolderId(folderId);
    setCreatingFolder(false);
    setNewFolderName('');
    try {
      const folder = await createEditorAssetFolder(
        label,
        assetFolders.length + 100,
      );
      setAssetFolders((currentFolders) =>
        currentFolders.map((currentFolder) =>
          currentFolder.id === folderId
            ? {
                id: folder.folderId,
                label: folder.label,
                collapsed: folder.collapsed,
                systemDefault: folder.systemDefault,
                persisted: true,
              }
            : currentFolder,
        ),
      );
      setAssets((currentAssets) =>
        currentAssets.map((asset) =>
          asset.folderId === folderId
            ? {
                ...asset,
                folderId: folder.folderId,
              }
            : asset,
        ),
      );
      setActiveUploadFolderId(folder.folderId);
    } catch {
      // 本地临时文件夹仍可继续使用；下次刷新以后端为准。
    }
  }, [assetFolders.length, newFolderName]);

  const deleteUploadedAsset = useCallback(
    (asset: EditorAsset) => {
      if (asset.sourceKind !== 'uploaded') {
        return;
      }
      setAssets((currentAssets) =>
        currentAssets.filter((currentAsset) => currentAsset.id !== asset.id),
      );
      onDeleteAssets?.([asset]);
      setRenamingAsset((currentRename) =>
        currentRename?.assetId === asset.id ? null : currentRename,
      );
      if (asset.persisted) {
        deleteEditorAsset(asset.id).catch(() => {});
      }
    },
    [onDeleteAssets],
  );

  const startRenamingFolder = useCallback((folder: EditorAssetFolder) => {
    setRenamingFolder({
      folderId: folder.id,
      value: folder.label,
    });
  }, []);

  const commitFolderRename = useCallback(
    (folder: EditorAssetFolder) => {
      const nextLabel = renamingFolder?.value.trim();
      if (!nextLabel) {
        setRenamingFolder(null);
        return;
      }
      setAssetFolders((currentFolders) =>
        currentFolders.map((currentFolder) =>
          currentFolder.id === folder.id
            ? {
                ...currentFolder,
                label: nextLabel,
              }
            : currentFolder,
        ),
      );
      if (folder.persisted) {
        updateEditorAssetFolder(folder.id, { label: nextLabel }).catch(
          () => {},
        );
      }
      setRenamingFolder(null);
    },
    [renamingFolder],
  );

  const deleteAssetFolder = useCallback(
    (folder: EditorAssetFolder) => {
      if (folder.systemDefault) {
        return;
      }
      const defaultFolder =
        assetFolders.find((currentFolder) => currentFolder.systemDefault) ??
        assetFolders[0];
      if (!defaultFolder) {
        return;
      }
      setAssetFolders((currentFolders) =>
        currentFolders.filter(
          (currentFolder) => currentFolder.id !== folder.id,
        ),
      );
      setAssets((currentAssets) =>
        currentAssets.map((asset) =>
          asset.folderId === folder.id
            ? {
                ...asset,
                folderId: defaultFolder.id,
              }
            : asset,
        ),
      );
      if (folder.persisted) {
        deleteEditorAssetFolder(folder.id)
          .then((library) => {
            const nextLibrary = normalizeAssetLibrary(library);
            setAssetFolders(nextLibrary.folders);
            setAssets(nextLibrary.assets);
          })
          .catch(() => {});
      }
    },
    [assetFolders],
  );

  const toggleAssetSelected = useCallback((assetId: string) => {
    setSelectedAssetIds((currentIds) => {
      const nextIds = new Set(currentIds);
      if (nextIds.has(assetId)) {
        nextIds.delete(assetId);
      } else {
        nextIds.add(assetId);
      }
      return nextIds;
    });
  }, []);

  const toggleAllAssetsSelected = useCallback(() => {
    setSelectedAssetIds(
      allSelectableAssetsSelected
        ? new Set()
        : new Set(selectableAssets.map((asset) => asset.id)),
    );
  }, [allSelectableAssetsSelected, selectableAssets]);

  const deleteSelectedAssets = useCallback(() => {
    const ids = [...selectedAssetIds];
    const deletedAssets = assets.filter((asset) =>
      selectedAssetIds.has(asset.id),
    );
    setAssets((currentAssets) =>
      currentAssets.filter((asset) => !selectedAssetIds.has(asset.id)),
    );
    onDeleteAssets?.(deletedAssets);
    setSelectedAssetIds(new Set());
    ids.forEach((assetId) => {
      void deleteEditorAsset(assetId);
    });
  }, [assets, onDeleteAssets, selectedAssetIds]);

  const moveAssetToFolder = useCallback(
    (assetId: string, folderId: string) => {
      const asset = assets.find((currentAsset) => currentAsset.id === assetId);
      if (!asset || asset.folderId === folderId) {
        return;
      }
      setAssets((currentAssets) =>
        currentAssets.map((currentAsset) =>
          currentAsset.id === assetId
            ? {
                ...currentAsset,
                folderId,
              }
            : currentAsset,
        ),
      );
      if (asset.persisted) {
        updateEditorAsset(asset.id, { folderId }).catch(() => {});
      }
    },
    [assets],
  );

  const closeAssetSelectionMode = useCallback(() => {
    setIsAssetSelectionMode(false);
    setSelectedAssetIds(new Set());
    setAssetMarquee(null);
  }, []);

  const updateAssetSelectionFromMarquee = useCallback(
    (selectionRect: {
      left: number;
      right: number;
      top: number;
      bottom: number;
    }) => {
      const nextSelectedIds = new Set<string>();
      assetListRef.current
        ?.querySelectorAll<HTMLElement>('[data-asset-id]')
        .forEach((element) => {
          const assetId = element.dataset.assetId;
          if (!assetId) {
            return;
          }
          const asset = assets.find(
            (currentAsset) => currentAsset.id === assetId,
          );
          if (!asset || asset.sourceKind !== 'uploaded') {
            return;
          }
          const rect = element.getBoundingClientRect();
          const intersects =
            rect.left <= selectionRect.right &&
            rect.right >= selectionRect.left &&
            rect.top <= selectionRect.bottom &&
            rect.bottom >= selectionRect.top;
          if (intersects) {
            nextSelectedIds.add(assetId);
          }
        });
      setSelectedAssetIds(nextSelectedIds);
    },
    [assetListRef, assets],
  );

  const handleAssetMarqueePointerDown = useCallback(
    (event: ReactPointerEvent<HTMLDivElement>) => {
      if (!isAssetSelectionMode || event.button !== 0) {
        return;
      }
      const target = event.target as HTMLElement;
      if (target.closest('button, input, textarea, select, [data-asset-id]')) {
        return;
      }
      event.preventDefault();
      assetListRef.current?.setPointerCapture?.(event.pointerId);
      const rect = assetListRef.current?.getBoundingClientRect();
      const startX = event.clientX - (rect?.left ?? 0);
      const startY = event.clientY - (rect?.top ?? 0);
      setAssetMarquee({
        pointerId: event.pointerId,
        startX,
        startY,
        currentX: startX,
        currentY: startY,
      });
      setSelectedAssetIds(new Set());
    },
    [assetListRef, isAssetSelectionMode],
  );

  const handleAssetMarqueePointerMove = useCallback(
    (event: ReactPointerEvent<HTMLDivElement>) => {
      if (!assetMarquee || assetMarquee.pointerId !== event.pointerId) {
        return;
      }
      event.preventDefault();
      const containerRect = assetListRef.current?.getBoundingClientRect();
      const currentX = event.clientX - (containerRect?.left ?? 0);
      const currentY = event.clientY - (containerRect?.top ?? 0);
      const startClientX = (containerRect?.left ?? 0) + assetMarquee.startX;
      const startClientY = (containerRect?.top ?? 0) + assetMarquee.startY;
      setAssetMarquee((currentMarquee) =>
        currentMarquee
          ? {
              ...currentMarquee,
              currentX,
              currentY,
            }
          : null,
      );
      updateAssetSelectionFromMarquee({
        left: Math.min(startClientX, event.clientX),
        right: Math.max(startClientX, event.clientX),
        top: Math.min(startClientY, event.clientY),
        bottom: Math.max(startClientY, event.clientY),
      });
    },
    [assetListRef, assetMarquee, updateAssetSelectionFromMarquee],
  );

  const handleAssetMarqueePointerUp = useCallback(
    (event: ReactPointerEvent<HTMLDivElement>) => {
      if (!assetMarquee || assetMarquee.pointerId !== event.pointerId) {
        return;
      }
      event.preventDefault();
      if (assetListRef.current?.hasPointerCapture?.(event.pointerId)) {
        assetListRef.current.releasePointerCapture?.(event.pointerId);
      }
      setAssetMarquee(null);
    },
    [assetListRef, assetMarquee],
  );

  return {
    assetFolders,
    setAssetFolders,
    assets,
    setAssets,
    groupedAssets,
    selectableAssets,
    allSelectableAssetsSelected,
    renamingAsset,
    setRenamingAsset,
    renamingFolder,
    setRenamingFolder,
    creatingFolder,
    setCreatingFolder,
    newFolderName,
    setNewFolderName,
    activeUploadFolderId,
    setActiveUploadFolderId,
    isAssetSelectionMode,
    setIsAssetSelectionMode,
    selectedAssetIds,
    setSelectedAssetIds,
    assetMarquee,
    setAssetMarquee,
    assetPointerDrag,
    setAssetPointerDrag,
    assetMoveDropFolderId,
    pinnedAssetMoveFolderId,
    resolveAssetFolderId,
    updateAssetMoveDropFolder,
    startRenamingAsset,
    commitAssetRename,
    toggleAssetFolder,
    commitNewAssetFolder,
    deleteUploadedAsset,
    startRenamingFolder,
    commitFolderRename,
    deleteAssetFolder,
    toggleAssetSelected,
    toggleAllAssetsSelected,
    deleteSelectedAssets,
    moveAssetToFolder,
    closeAssetSelectionMode,
    handleAssetMarqueePointerDown,
    handleAssetMarqueePointerMove,
    handleAssetMarqueePointerUp,
  };
}

export type ImageCanvasAssetLibraryState = ReturnType<
  typeof useImageCanvasAssetLibrary
>;

export type ImageCanvasAssetLibrarySetter<T> = Dispatch<SetStateAction<T>>;