import type {
  AffineCloudWorkspace,
  WorkspaceCRUD,
} from '@affine/env/workspace';
import { WorkspaceFlavour } from '@affine/env/workspace';
import {
  createWorkspaceMutation,
  deleteWorkspaceMutation,
  getWorkspaceQuery,
  getWorkspacesQuery,
} from '@affine/graphql';
import { createIndexeddbStorage, Workspace } from '@blocksuite/store';
import { migrateLocalBlobStorage } from '@toeverything/infra/blocksuite';
import { getSession } from 'next-auth/react';
import { proxy } from 'valtio/vanilla';

import { getOrCreateWorkspace } from '../manager';
import { fetcher } from './gql';

const Y = Workspace.Y;

async function deleteLocalBlobStorage(id: string) {
  const storage = createIndexeddbStorage(id);
  const keys = await storage.crud.list();
  for (const key of keys) {
    await storage.crud.delete(key);
  }
}

// we don't need to persistence the state into local storage
//  because if a user clicks create multiple time and nothing happened
//  because of the server delay or something, he/she will wait.
// and also the user journey of creating workspace is long.
const createdWorkspaces = proxy<string[]>([]);

export const CRUD: WorkspaceCRUD<WorkspaceFlavour.AFFINE_CLOUD> = {
  create: async upstreamWorkspace => {
    if (createdWorkspaces.some(id => id === upstreamWorkspace.id)) {
      throw new Error('workspace already created');
    }
    const { createWorkspace } = await fetcher({
      query: createWorkspaceMutation,
    });

    createdWorkspaces.push(upstreamWorkspace.id);
    const newBlockSuiteWorkspace = getOrCreateWorkspace(
      createWorkspace.id,
      WorkspaceFlavour.AFFINE_CLOUD
    );

    if (environment.isDesktop) {
      // this will clone all data from existing db to new db file, including docs and blobs
      await window.apis.workspace.clone(
        upstreamWorkspace.id,
        createWorkspace.id
      );

      // skip apply updates in memory and we will use providers to sync data from db
    } else {
      Y.applyUpdate(
        newBlockSuiteWorkspace.doc,
        Y.encodeStateAsUpdate(upstreamWorkspace.doc)
      );

      await Promise.all(
        [...upstreamWorkspace.doc.subdocs].map(async subdoc => {
          subdoc.load();
          return subdoc.whenLoaded.then(() => {
            newBlockSuiteWorkspace.doc.subdocs.forEach(newSubdoc => {
              if (newSubdoc.guid === subdoc.guid) {
                Y.applyUpdate(newSubdoc, Y.encodeStateAsUpdate(subdoc));
              }
            });
          });
        })
      );

      migrateLocalBlobStorage(upstreamWorkspace.id, createWorkspace.id)
        .then(() => deleteLocalBlobStorage(upstreamWorkspace.id))
        .catch(e => {
          console.error('error when moving blob storage:', e);
        });
      // todo(himself65): delete old workspace in the future
    }

    return createWorkspace.id;
  },
  delete: async workspace => {
    await fetcher({
      query: deleteWorkspaceMutation,
      variables: {
        id: workspace.id,
      },
    });
  },
  get: async id => {
    if (!environment.isServer && !navigator.onLine) {
      // no network
      return null;
    }
    if (
      !(await getSession()
        .then(() => true)
        .catch(() => false))
    ) {
      return null;
    }
    try {
      await fetcher({
        query: getWorkspaceQuery,
        variables: {
          id,
        },
      });
      return {
        id,
        flavour: WorkspaceFlavour.AFFINE_CLOUD,
        blockSuiteWorkspace: getOrCreateWorkspace(
          id,
          WorkspaceFlavour.AFFINE_CLOUD
        ),
      } satisfies AffineCloudWorkspace;
    } catch (e) {
      console.error('error when fetching cloud workspace:', e);
      return null;
    }
  },
  list: async () => {
    if (!environment.isServer && !navigator.onLine) {
      // no network
      return [];
    }
    if (
      !(await getSession()
        .then(() => true)
        .catch(() => false))
    ) {
      return [];
    }
    try {
      const { workspaces } = await fetcher({
        query: getWorkspacesQuery,
      });
      const ids = workspaces.map(({ id }) => id);

      return ids.map(
        id =>
          ({
            id,
            flavour: WorkspaceFlavour.AFFINE_CLOUD,
            blockSuiteWorkspace: getOrCreateWorkspace(
              id,
              WorkspaceFlavour.AFFINE_CLOUD
            ),
          }) satisfies AffineCloudWorkspace
      );
    } catch (e) {
      console.error('error when fetching cloud workspaces:', e);
      return [];
    }
  },
};