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

import { ApiClientError } from '../../services/apiClient';
import {
  createEditorAssetFolder,
  deleteEditorAsset,
  deleteEditorAssetFolder,
  loadEditorAssetLibrary,
  submitEditorAssetShowcase,
  updateEditorAsset,
  updateEditorAssetFolder,
} from '../../services/image-editor/editorProjectClient';
import {
  createLocalAssetFolder,
  deleteAssetFolderLocally,
  groupAssetsByFolder,
  moveAssetToFolderLocally,
  removeAssetById,
  removeSelectedAssets,
  renameAssetById,
  renameAssetFolderById,
  replaceLocalAssetFolder,
  resolveAssetFolderIdFromPoint,
  resolveAssetShowcaseSubmissionState,
  resolveDefaultAssetFolder,
  resolvePinnedAssetMoveFolderId,
  toggleAssetFolderCollapsed,
} from './ImageCanvasAssetLibraryModel';
import {
  EDITOR_ASSET_FOLDERS,
  escapeCssIdentifier,
  normalizeAssetLibrary,
} from './ImageCanvasEditorModel';
import type {
  AssetPointerDragState,
  EditorAsset,
  EditorAssetFolder,
} from './ImageCanvasEditorTypes';
import { useImageCanvasAssetSelection } from './useImageCanvasAssetSelection';
export { readImageFileAsDataUrl } from './ImageCanvasFileModel';

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

function formatShowcaseSubmitError(error: unknown) {
  if (error instanceof ApiClientError && error.message.trim()) {
    return error.message.trim();
  }
  if (error instanceof Error && error.message.trim()) {
    return error.message.trim();
  }
  return '提交精选审核失败，请稍后重试';
}

const ASSET_FOLDER_SELECTOR = '[data-asset-folder-id]';

function readAssetFolderHitTargets(listElement: ParentNode | null) {
  return [
    ...(listElement?.querySelectorAll<HTMLElement>(ASSET_FOLDER_SELECTOR) ??
      []),
  ]
    .map((element) => {
      const folderId = element.dataset.assetFolderId;
      return folderId
        ? {
            folderId,
            rect: element.getBoundingClientRect(),
          }
        : null;
    })
    .filter((target): target is NonNullable<typeof target> => Boolean(target));
}

export function useImageCanvasAssetLibrary({
  assetListRef,
  assetPointerDragRef,
  canAccessProtectedData,
  openEditorLoginModal,
  onDeleteAssets,
  onOpenSelectionMode,
}: {
  assetListRef: RefObject<HTMLDivElement | null>;
  assetPointerDragRef: RefObject<AssetPointerDragState | null>;
  canAccessProtectedData: boolean;
  openEditorLoginModal: (postLoginAction?: (() => void) | null) => void;
  onDeleteAssets?: (assets: EditorAsset[]) => boolean | void;
  onOpenSelectionMode?: () => 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 [assetPointerDrag, setAssetPointerDrag] =
    useState<AssetPointerDragState | null>(null);
  const [assetMoveDropFolderId, setAssetMoveDropFolderId] = useState<
    string | null
  >(null);
  const [pinnedAssetMoveFolderId, setPinnedAssetMoveFolderId] = useState<
    string | null
  >(null);

  const groupedAssets = useMemo(
    () => groupAssetsByFolder(assetFolders, assets),
    [assetFolders, assets],
  );
  const clearAssetRenameState = useCallback(() => {
    setRenamingAsset(null);
    setRenamingFolder(null);
  }, []);
  const prepareAssetSelectionMode = useCallback(() => {
    clearAssetRenameState();
    assetPointerDragRef.current = null;
    setAssetPointerDrag(null);
    setAssetMoveDropFolderId(null);
    setPinnedAssetMoveFolderId(null);
    onOpenSelectionMode?.();
  }, [assetPointerDragRef, clearAssetRenameState, onOpenSelectionMode]);
  const {
    selectableAssets,
    selectedAssets,
    selectedAssetIds,
    isAssetSelectionMode,
    assetMarquee,
    clearAssetSelection,
    openAssetSelectionMode,
    closeAssetSelectionMode,
    toggleAssetSelected,
    toggleAllAssetsSelected,
    handleAssetMarqueePointerDown,
    handleAssetMarqueePointerMove,
    handleAssetMarqueePointerUp,
    handleAssetMarqueePointerCancel,
    handleAssetMarqueeLostPointerCapture,
  } = useImageCanvasAssetSelection({
    assetListRef,
    assets,
    onOpenSelectionMode: prepareAssetSelectionMode,
  });

  const applyAssetLibrarySnapshot = useCallback(
    (
      library: Awaited<ReturnType<typeof loadEditorAssetLibrary>>,
      options: { preferDefaultUploadFolder?: boolean } = {},
    ) => {
      const nextLibrary = normalizeAssetLibrary(library);
      setAssetFolders(nextLibrary.folders);
      setAssets(nextLibrary.assets);
      const defaultFolder =
        nextLibrary.folders.find((folder) => folder.systemDefault) ??
        nextLibrary.folders[0];
      setActiveUploadFolderId((currentFolderId) => {
        if (
          !options.preferDefaultUploadFolder &&
          nextLibrary.folders.some((folder) => folder.id === currentFolderId)
        ) {
          return currentFolderId;
        }
        return defaultFolder?.id ?? 'project';
      });
    },
    [],
  );

  const refreshAssetLibrary = useCallback(async () => {
    if (!canAccessProtectedData) {
      return;
    }
    try {
      applyAssetLibrarySnapshot(await loadEditorAssetLibrary());
    } catch (error: unknown) {
      if (isEditorAuthError(error)) {
        openEditorLoginModal();
      }
    }
  }, [applyAssetLibrarySnapshot, canAccessProtectedData, openEditorLoginModal]);

  useEffect(() => {
    if (!canAccessProtectedData) {
      return undefined;
    }
    let cancelled = false;
    loadEditorAssetLibrary()
      .then((library) => {
        if (cancelled) {
          return;
        }
        applyAssetLibrarySnapshot(library, { preferDefaultUploadFolder: true });
      })
      .catch((error: unknown) => {
        if (!cancelled && isEditorAuthError(error)) {
          openEditorLoginModal();
        }
      });
    return () => {
      cancelled = true;
    };
  }, [applyAssetLibrarySnapshot, canAccessProtectedData, openEditorLoginModal]);

  const resolveAssetFolderId = useCallback(
    (clientX: number, clientY: number) => {
      const listElement = assetListRef.current;
      if (!listElement) {
        return null;
      }
      return resolveAssetFolderIdFromPoint({
        point: { clientX, clientY },
        listRect: listElement.getBoundingClientRect(),
        folders: readAssetFolderHitTargets(listElement),
      });
    },
    [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)}"]`,
      );
      setPinnedAssetMoveFolderId(
        resolvePinnedAssetMoveFolderId({
          folderId,
          listRect: listElement?.getBoundingClientRect(),
          headerRect: header?.getBoundingClientRect(),
        }),
      );
    },
    [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) =>
        renameAssetById(currentAssets, asset.id, nextLabel),
      );
      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) =>
        toggleAssetFolderCollapsed(currentFolders, folderId),
      );
      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,
      createLocalAssetFolder({ folderId, label }),
    ]);
    setActiveUploadFolderId(folderId);
    setCreatingFolder(false);
    setNewFolderName('');
    try {
      const folder = await createEditorAssetFolder(
        label,
        assetFolders.length + 100,
      );
      setAssetFolders(
        (currentFolders) =>
          replaceLocalAssetFolder({
            folders: currentFolders,
            assets: [],
            localFolderId: folderId,
            persistedFolder: folder,
          }).folders,
      );
      setAssets(
        (currentAssets) =>
          replaceLocalAssetFolder({
            folders: [],
            assets: currentAssets,
            localFolderId: folderId,
            persistedFolder: folder,
          }).assets,
      );
      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;
      }
      if (onDeleteAssets?.([asset]) === false) {
        return;
      }
      setAssets((currentAssets) => removeAssetById(currentAssets, asset.id));
      setRenamingAsset((currentRename) =>
        currentRename?.assetId === asset.id ? null : currentRename,
      );
      if (asset.persisted) {
        deleteEditorAsset(asset.id).catch(() => {});
      }
    },
    [onDeleteAssets],
  );

  const submitAssetToShowcase = useCallback((asset: EditorAsset) => {
    if (!resolveAssetShowcaseSubmissionState(asset).canSubmit) {
      return;
    }
    const previousAsset = asset;
    setAssets((currentAssets) =>
      currentAssets.map((currentAsset) =>
        currentAsset.id === asset.id
          ? {
              ...currentAsset,
              publicShowcaseEnabled: false,
              showcaseReviewStatus: 'pending',
              showcaseDisplayEnabled: false,
              showcaseSubmitError: undefined,
            }
          : currentAsset,
      ),
    );
    submitEditorAssetShowcase(asset.id)
      .then((showcaseAsset) => {
        setAssets((currentAssets) =>
          currentAssets.map((currentAsset) =>
            currentAsset.id === asset.id
              ? {
                  ...currentAsset,
                  publicShowcaseEnabled: false,
                  showcaseId:
                    showcaseAsset.showcaseId ?? showcaseAsset.resourceId,
                  showcaseReviewStatus: showcaseAsset.reviewStatus ?? 'pending',
                  showcaseDisplayEnabled: showcaseAsset.displayEnabled ?? false,
                  showcaseLikeCount: showcaseAsset.likeCount ?? 0,
                  generationCostMudPoints:
                    showcaseAsset.generationCostMudPoints ??
                    currentAsset.generationCostMudPoints,
                  showcaseSubmitError: undefined,
                }
              : currentAsset,
          ),
        );
      })
      .catch((error: unknown) => {
        const showcaseSubmitError = formatShowcaseSubmitError(error);
        setAssets((currentAssets) =>
          currentAssets.map((currentAsset) =>
            currentAsset.id === asset.id
              ? {
                  ...previousAsset,
                  showcaseSubmitError,
                }
              : currentAsset,
          ),
        );
      });
  }, []);

  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) =>
        renameAssetFolderById(currentFolders, folder.id, nextLabel),
      );
      if (folder.persisted) {
        updateEditorAssetFolder(folder.id, { label: nextLabel }).catch(
          () => {},
        );
      }
      setRenamingFolder(null);
    },
    [renamingFolder],
  );

  const deleteAssetFolder = useCallback(
    (folder: EditorAssetFolder) => {
      if (folder.systemDefault) {
        return;
      }
      const defaultFolder = resolveDefaultAssetFolder(assetFolders);
      if (!defaultFolder) {
        return;
      }
      setAssetFolders(
        (currentFolders) =>
          deleteAssetFolderLocally({
            folders: currentFolders,
            assets: [],
            folderId: folder.id,
            defaultFolderId: defaultFolder.id,
          }).folders,
      );
      setAssets(
        (currentAssets) =>
          deleteAssetFolderLocally({
            folders: [],
            assets: currentAssets,
            folderId: folder.id,
            defaultFolderId: defaultFolder.id,
          }).assets,
      );
      if (folder.persisted) {
        deleteEditorAssetFolder(folder.id)
          .then((library) => {
            const nextLibrary = normalizeAssetLibrary(library);
            setAssetFolders(nextLibrary.folders);
            setAssets(nextLibrary.assets);
          })
          .catch(() => {});
      }
    },
    [assetFolders],
  );

  const deleteSelectedAssets = useCallback(
    (requestedAssetIds?: ReadonlySet<string>) => {
      const targetAssetIds = new Set(requestedAssetIds ?? selectedAssetIds);
      const targetAssets = assets.filter((asset) =>
        targetAssetIds.has(asset.id),
      );
      const ids = targetAssets.map((asset) => asset.id);
      if (onDeleteAssets?.(targetAssets) === false) {
        return;
      }
      setAssets(
        (currentAssets) =>
          removeSelectedAssets(currentAssets, targetAssetIds).assets,
      );
      clearAssetSelection();
      ids.forEach((assetId) => {
        void deleteEditorAsset(assetId);
      });
    },
    [assets, clearAssetSelection, 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) =>
        moveAssetToFolderLocally(currentAssets, assetId, folderId),
      );
      if (asset.persisted) {
        updateEditorAsset(asset.id, { folderId }).catch(() => {});
      }
    },
    [assets],
  );

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

export type ImageCanvasAssetLibraryState = ReturnType<
  typeof useImageCanvasAssetLibrary
>;

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