import { type RefObject, useCallback, useEffect, useRef, useState } from 'react';

import { ApiClientError } from '../../services/apiClient';
import {
  createEditorProjectResource,
  loadEditorProject,
  loadOrCreateRecentEditorProject,
  saveEditorProjectLayout,
} from '../../services/image-editor/editorProjectClient';
import { hydrateLayer, serializeLayer } from './ImageCanvasEditorModel';
import type { CanvasLayer, CanvasViewport } from './ImageCanvasEditorTypes';

type ProjectResourceOptions = {
  onCreated?: (resourceId: string) => void;
  snapshotLayers?: CanvasLayer[];
};

type PendingProjectResourceLayer = {
  layer: CanvasLayer;
  options: ProjectResourceOptions;
};

type ImageCanvasProjectPersistenceRefs = {
  layersRef: RefObject<CanvasLayer[]>;
  viewportRef: RefObject<CanvasViewport>;
};

type ImageCanvasProjectPersistenceSetters = {
  setProjectTitle: (title: string) => void;
  setProjectRenameValue: (title: string) => void;
  setViewport: (viewport: CanvasViewport) => void;
  setLayers: (layers: CanvasLayer[]) => void;
  selectSingleLayer: (layerId: string | null) => void;
  setLayerCounter: (value: number) => void;
};

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

export function useImageCanvasProjectPersistence({
  refs,
  setters,
  layers,
  viewport,
  canAccessProtectedData,
  openEditorLoginModal,
}: {
  refs: ImageCanvasProjectPersistenceRefs;
  setters: ImageCanvasProjectPersistenceSetters;
  layers: CanvasLayer[];
  viewport: CanvasViewport;
  canAccessProtectedData: boolean;
  openEditorLoginModal: (postLoginAction?: (() => void) | null) => void;
}) {
  const projectIdRef = useRef<string | null>(null);
  const pendingProjectResourceLayersRef = useRef<PendingProjectResourceLayer[]>(
    [],
  );
  const saveTimerRef = useRef<number | null>(null);
  const [projectId, setProjectId] = useState<string | null>(null);
  const [isProjectReady, setIsProjectReady] = useState(false);

  const createProjectResourceForLayer = useCallback(
    (layer: CanvasLayer, options: ProjectResourceOptions = {}) => {
      const readyProjectId = projectIdRef.current;
      if (!readyProjectId) {
        pendingProjectResourceLayersRef.current.push({ layer, options });
        return;
      }
      createEditorProjectResource(readyProjectId, {
        imageSrc: layer.src,
        objectKey: layer.objectKey,
        assetObjectId: layer.assetObjectId,
        width: layer.originalWidth,
        height: layer.originalHeight,
        sourceType: layer.sourceType,
        prompt: layer.prompt,
        actualPrompt: layer.actualPrompt,
        model: layer.model,
        provider: layer.provider,
        taskId: layer.taskId,
        sourceResourceId: layer.sourceResourceId,
      })
        .then((resource) => {
          options.onCreated?.(resource.resourceId);
          const layerWithResourceId = {
            ...layer,
            resourceId: resource.resourceId,
          };
          const currentLayers = refs.layersRef.current;
          const nextLayers = currentLayers.some(
            (currentLayer) => currentLayer.id === layer.id,
          )
            ? currentLayers.map((currentLayer) =>
                currentLayer.id === layer.id
                  ? layerWithResourceId
                  : currentLayer,
              )
            : options.snapshotLayers?.some(
                  (snapshotLayer) => snapshotLayer.id === layer.id,
                )
              ? options.snapshotLayers.map((snapshotLayer) =>
                  snapshotLayer.id === layer.id
                    ? layerWithResourceId
                    : snapshotLayer,
                )
              : currentLayers;
          refs.layersRef.current = nextLayers;
          setters.setLayers(nextLayers);
          if (nextLayers.length) {
            void saveEditorProjectLayout(readyProjectId, {
              viewport: refs.viewportRef.current,
              layers: nextLayers.map(serializeLayer),
            }).catch((error: unknown) => {
              if (isEditorAuthError(error)) {
                openEditorLoginModal();
              }
            });
          }
        })
        .catch((error: unknown) => {
          if (isEditorAuthError(error)) {
            openEditorLoginModal();
          }
        });
    },
    [openEditorLoginModal, refs, setters],
  );

  const appendCanvasLayersWithResources = useCallback(
    (nextLayers: CanvasLayer[]) => {
      if (!nextLayers.length) {
        return;
      }
      const snapshotLayers = [...refs.layersRef.current, ...nextLayers];
      refs.layersRef.current = snapshotLayers;
      setters.setLayers(snapshotLayers);
      nextLayers.forEach((layer) =>
        createProjectResourceForLayer(layer, { snapshotLayers }),
      );
    },
    [createProjectResourceForLayer, refs, setters],
  );

  useEffect(() => {
    if (!canAccessProtectedData) {
      setIsProjectReady(false);
      return undefined;
    }
    let cancelled = false;
    const projectIdFromQuery =
      typeof window === 'undefined'
        ? null
        : new URLSearchParams(window.location.search)
            .get('projectid')
            ?.trim() || null;
    const loadProject = projectIdFromQuery
      ? loadEditorProject(projectIdFromQuery)
      : loadOrCreateRecentEditorProject();

    loadProject
      .then((project) => {
        if (cancelled) {
          return;
        }
        projectIdRef.current = project.projectId;
        setProjectId(project.projectId);
        const nextProjectTitle = project.title?.trim() || '未命名画布';
        setters.setProjectTitle(nextProjectTitle);
        setters.setProjectRenameValue(nextProjectTitle);
        const pendingLayers = pendingProjectResourceLayersRef.current.splice(0);
        pendingLayers.forEach(({ layer, options }) => {
          createProjectResourceForLayer(layer, options);
        });
        setters.setViewport(project.viewport);
        const resourcesById = new Map(
          project.resources.map((resource) => [
            resource.resourceId,
            { imageSrc: resource.imageSrc },
          ]),
        );
        const hydratedLayers = project.layers
          .map((layer) => hydrateLayer(layer, resourcesById))
          .filter((layer): layer is CanvasLayer => Boolean(layer));
        if (hydratedLayers.length > 0) {
          setters.setLayerCounter(hydratedLayers.length);
          setters.setLayers(hydratedLayers);
          setters.selectSingleLayer(hydratedLayers[0]?.id ?? null);
        }
        setIsProjectReady(true);
      })
      .catch((error: unknown) => {
        if (cancelled) {
          return;
        }
        setIsProjectReady(false);
        if (isEditorAuthError(error)) {
          openEditorLoginModal(() => {
            window.location.reload();
          });
        }
      });

    return () => {
      cancelled = true;
    };
  }, [
    canAccessProtectedData,
    createProjectResourceForLayer,
    openEditorLoginModal,
    setters,
  ]);

  useEffect(() => {
    if (!projectId || !isProjectReady) {
      return undefined;
    }
    if (saveTimerRef.current) {
      window.clearTimeout(saveTimerRef.current);
    }

    saveTimerRef.current = window.setTimeout(() => {
      saveEditorProjectLayout(projectId, {
        viewport,
        layers: layers.map(serializeLayer),
      }).catch((error: unknown) => {
        if (isEditorAuthError(error)) {
          openEditorLoginModal();
        }
      });
    }, 450);

    return () => {
      if (saveTimerRef.current) {
        window.clearTimeout(saveTimerRef.current);
      }
    };
  }, [isProjectReady, layers, openEditorLoginModal, projectId, viewport]);

  return {
    projectId,
    isProjectReady,
    projectIdRef,
    createProjectResourceForLayer,
    appendCanvasLayersWithResources,
  };
}