import type { Logger } from '$:/core/modules/utils/logger.js';
import type { IWikiServerStatusObject } from '@services/wiki/wikiWorker/ipcServerRoutes';
import type { WindowMeta, WindowNames } from '@services/windows/WindowProperties';
import debounce from 'lodash/debounce';
import type { IChangedTiddlers, ITiddlerFields, Syncer, Tiddler, Wiki } from 'tiddlywiki';

type ISyncAdaptorGetStatusCallback = (error: Error | null, isLoggedIn?: boolean, username?: string, isReadOnly?: boolean, isAnonymous?: boolean) => void;
type ISyncAdaptorGetTiddlersJSONCallback = (error: Error | null, tiddler?: Array<Omit<ITiddlerFields, 'text'>>) => void;
type ISyncAdaptorPutTiddlersCallback = (error: Error | null | string, etag?: {
  bag: string;
}, version?: string) => void;
type ISyncAdaptorLoadTiddlerCallback = (error: Error | null, tiddler?: ITiddlerFields) => void;
type ISyncAdaptorDeleteTiddlerCallback = (error: Error | null, adaptorInfo?: { bag?: string } | null) => void;

class TidGiIPCSyncAdaptor {
  name = 'tidgi-ipc';
  supportsLazyLoading = true;
  wiki: Wiki;
  hasStatus: boolean;
  logger: Logger;
  isLoggedIn: boolean;
  isAnonymous: boolean;
  isReadOnly: boolean;
  logoutIsAvailable: boolean;
  wikiService: typeof window.service.wiki;
  workspaceService: typeof window.service.workspace;
  authService: typeof window.service.auth;
  workspaceID: string;
  recipe?: string;

  constructor(options: { wiki: Wiki }) {
    this.wiki = options.wiki;
    this.wikiService = window.service.wiki;
    this.workspaceService = window.service.workspace;
    this.authService = window.service.auth;
    this.hasStatus = false;
    this.isAnonymous = false;
    this.logger = new $tw.utils.Logger('TidGiIPCSyncAdaptor');
    this.isLoggedIn = false;
    this.isReadOnly = false;
    this.logoutIsAvailable = true;
    const workspaceID = (typeof window.meta === 'function' ? window.meta() as WindowMeta[WindowNames.view] : undefined)?.workspace?.id;
    if (workspaceID === undefined) {
      throw new Error('TidGiIPCSyncAdaptor: workspaceID is undefined. Cannot initialize sync adaptor without a valid workspace ID.');
    }
    this.workspaceID = workspaceID;
    if (window.observables?.wiki?.getWikiChangeObserver$ !== undefined) {
      // if install-electron-ipc-cat is faster than us, just subscribe to the observable. Otherwise we normally will wait for it to call us here.
      this.setupSSE();
    }
  }

  /**
   * This should be called after install-electron-ipc-cat, so this is called in `$:/plugins/linonetwo/tidgi-ipc-syncadaptor/Startup/install-electron-ipc-cat.js`
   */
  setupSSE() {
    console.log('setupSSE called in TidGiIPCSyncAdaptor');
    if (window.observables?.wiki?.getWikiChangeObserver$ === undefined) {
      console.error("getWikiChangeObserver$ is undefined in window.observables.wiki, can't subscribe to server changes.");
      return;
    }
    const debouncedSync = debounce(() => {
      if ($tw.syncer === undefined) {
        console.error('Syncer is undefined in TidGiIPCSyncAdaptor. Abort the `syncFromServer` in `setupSSE debouncedSync`.');
        return;
      }
      $tw.syncer.syncFromServer();
      this.clearUpdatedTiddlers();
    }, 500);
    this.logger.log('setupSSE');

    // After SSE is enabled, we can disable polling and else things that related to syncer. (build up complexer behavior with syncer.)
    this.configSyncer();

    window.observables.wiki.getWikiChangeObserver$(this.workspaceID).subscribe((change: IChangedTiddlers) => {
      // `$tw.syncer.syncFromServer` calling `this.getUpdatedTiddlers`, so we need to update `this.updatedTiddlers` before it do so. See `core/modules/syncer.js` in the core
      Object.keys(change).forEach(title => {
        if (!change[title]) {
          return;
        }

        if (change[title].deleted) {
          // For deletions, we don't need to check modified time
          this.updatedTiddlers.deletions.push(title);
        } else if (change[title].modified) {
          // Add to modifications - watch-fs already filtered out echoes via file exclusion
          this.updatedTiddlers.modifications.push(title);
        }
      });
      debouncedSync();
    });
  }

  updatedTiddlers: { deletions: string[]; modifications: string[] } = {
    // use $:/StoryList to trigger a initial sync, otherwise it won't do lazy load for Index tiddler after init, don't know why, maybe because we disabled the polling by changing pollTimerInterval.
    modifications: [],
    deletions: [],
  };

  clearUpdatedTiddlers() {
    this.updatedTiddlers = {
      modifications: [],
      deletions: [],
    };
  }

  private configSyncer() {
    if ($tw.syncer === undefined) {
      console.error('Syncer is undefined in TidGiIPCSyncAdaptor. Abort the configSyncer.');
      return;
    }
    $tw.syncer.pollTimerInterval = 2_147_483_647;
  }

  getUpdatedTiddlers(_syncer: Syncer, callback: (error: Error | null | undefined, changes: { deletions: string[]; modifications: string[] }) => void): void {
    this.logger.log('getUpdatedTiddlers');
    callback(null, this.updatedTiddlers);
  }

  setLoggerSaveBuffer(loggerForSaving: Logger) {
    this.logger.setSaveBuffer(loggerForSaving);
  }

  isReady() {
    // We ipc sync adaptor is always ready to work! (Otherwise this will be false for first lazy-load event.) Seems first lazy load happened before the first status ipc call returns.
    return true;
  }

  getTiddlerInfo(tiddler: Tiddler) {
    return {
      bag: tiddler.fields.bag,
    };
  }

  getTiddlerRevision(title: string) {
    const tiddler = this.wiki.getTiddler(title);
    return tiddler?.fields.revision;
  }

  /*
  Get the current status of the TiddlyWeb connection
  */
  async getStatus(callback?: ISyncAdaptorGetStatusCallback) {
    this.logger.log('Getting status');
    try {
      const workspace = await this.workspaceService.get(this.workspaceID);
      const userName = workspace === undefined ? '' : await this.authService.getUserName(workspace);
      const statusResponse = await this.wikiService.callWikiIpcServerRoute(this.workspaceID, 'getStatus', userName);
      const status = statusResponse?.data as IWikiServerStatusObject;
      if (status === undefined) {
        throw new Error('No status returned from callWikiIpcServerRoute getStatus');
      }
      this.hasStatus = true;
      // Record the recipe
      this.recipe = status.space.recipe;
      // Check if we're logged in
      this.isLoggedIn = status.username !== 'GUEST';
      this.isReadOnly = status.read_only ?? false;
      this.isAnonymous = status.anonymous ?? false;
      // this.logoutIsAvailable = 'logout_is_available' in status ? !!status.logout_is_available : true;

      callback?.(null, this.isLoggedIn, status.username, this.isReadOnly, this.isAnonymous);
    } catch (error) {
      callback?.(error as Error);
    }
  }

  /*
  Get an array of skinny tiddler fields from the server
  */
  async getSkinnyTiddlers(callback: ISyncAdaptorGetTiddlersJSONCallback) {
    try {
      this.logger.log('getSkinnyTiddlers');
      /**
       * This by default omit the text field.
       */
      const tiddlersJSONResponse = await this.wikiService.callWikiIpcServerRoute(
        this.workspaceID,
        'getTiddlersJSON',
        '[all[tiddlers]] -[[$:/isEncrypted]] -[prefix[$:/temp/]] -[prefix[$:/status/]] -[[$:/boot/boot.js]] -[[$:/boot/bootprefix.js]] -[[$:/library/sjcl.js]] -[[$:/core]]',
      );

      // Process the tiddlers to make sure the revision is a string
      const skinnyTiddlers = tiddlersJSONResponse?.data as Array<Omit<ITiddlerFields, 'text'>> | undefined;
      if (skinnyTiddlers === undefined) {
        throw new Error('No tiddlers returned from callWikiIpcServerRoute getTiddlersJSON in getSkinnyTiddlers');
      }
      this.logger.log('skinnyTiddlers.length', skinnyTiddlers.length);
      // Invoke the callback with the skinny tiddlers
      callback(null, skinnyTiddlers);
    } catch (error) {
      callback(error as Error);
    }
  }

  /*
  Save a tiddler and invoke the callback with (err,adaptorInfo,revision)
  */
  async saveTiddler(tiddler: Tiddler, callback: ISyncAdaptorPutTiddlersCallback, _options?: unknown) {
    if (this.isReadOnly) {
      callback(null);
      return;
    }
    try {
      const title = tiddler.fields.title;
      const tiddlersToNotSave = $tw.utils.parseStringArray(this.wiki.getTiddlerText('$:/plugins/linonetwo/tidgi-ipc-syncadaptor/TiddlersToNotSave') ?? '');
      if (tiddlersToNotSave.includes(title)) {
        this.logger.log(`Ignore saveTiddler ${title}, config in TiddlersToNotSave`);
        // if not calling callback in sync adaptor, will cause it waiting forever
        callback(null);
        return;
      }
      this.logger.log(`saveTiddler ${title}`);
      const putTiddlerResponse = await this.wikiService.callWikiIpcServerRoute(
        this.workspaceID,
        'putTiddler',
        title,
        tiddler.fields,
      );
      if (putTiddlerResponse === undefined) {
        throw new Error('saveTiddler returned undefined from callWikiIpcServerRoute putTiddler in saveTiddler');
      }
      // Save the details of the new revision of the tiddler
      const etag = putTiddlerResponse.headers?.Etag;
      if (etag === undefined) {
        callback(new Error('Response from server is missing required `etag` header'));
      } else {
        const etagInfo = this.parseEtag(etag);
        if (etagInfo !== undefined) {
          // Invoke the callback
          callback(null, {
            bag: etagInfo.bag,
          }, etagInfo.revision);
        }
      }
    } catch (error) {
      console.error(error);
      callback(error as Error);
    }
  }

  /*
  Load a tiddler and invoke the callback with (err,tiddlerFields)
  */
  async loadTiddler(title: string, callback?: ISyncAdaptorLoadTiddlerCallback) {
    this.logger.log(`loadTiddler ${title}`);
    try {
      const getTiddlerResponse = await this.wikiService.callWikiIpcServerRoute(
        this.workspaceID,
        'getTiddler',
        title,
      );
      if (getTiddlerResponse?.data === undefined) {
        throw new Error('getTiddler returned undefined from callWikiIpcServerRoute getTiddler in loadTiddler');
      }
      callback?.(null, getTiddlerResponse.data as ITiddlerFields);
    } catch (error) {
      callback?.(error as Error);
    }
  }

  /*
  Delete a tiddler and invoke the callback with (err)
  options include:
  tiddlerInfo: the syncer's tiddlerInfo for this tiddler
  */
  async deleteTiddler(title: string, callback: ISyncAdaptorDeleteTiddlerCallback) {
    if (this.isReadOnly) {
      callback(null);
      return;
    }
    this.logger.log('deleteTiddler');
    // For deletions, we don't track modified time since the tiddler is being removed
    const getTiddlerResponse = await this.wikiService.callWikiIpcServerRoute(
      this.workspaceID,
      'deleteTiddler',
      title,
    );
    try {
      if (getTiddlerResponse?.data === undefined) {
        throw new Error('getTiddler returned undefined from callWikiIpcServerRoute getTiddler in loadTiddler');
      }
      // Invoke the callback & return null adaptorInfo
      callback(null, null);
    } catch (error) {
      callback(error as Error);
    }
  }

  /*
  Split a TiddlyWeb Etag into its constituent parts. For example:

  ```
  "system-images_public/unsyncedIcon/946151:9f11c278ccde3a3149f339f4a1db80dd4369fc04"
  ```

  Note that the value includes the opening and closing double quotes.

  The parts are:

  ```
  <bag>/<title>/<revision>:<hash>
  ```
  */
  parseEtag(etag: string) {
    const firstSlash = etag.indexOf('/');
    const lastSlash = etag.lastIndexOf('/');
    const colon = etag.lastIndexOf(':');
    if (!(firstSlash === -1 || lastSlash === -1 || colon === -1)) {
      return {
        bag: $tw.utils.decodeURIComponentSafe(etag.substring(1, firstSlash)),
        title: $tw.utils.decodeURIComponentSafe(etag.substring(firstSlash + 1, lastSlash)),
        revision: etag.substring(lastSlash + 1, colon),
      };
    }
  }
}

if ($tw.browser && typeof window !== 'undefined') {
  const isInTidGi = typeof document !== 'undefined' && document.location.protocol.startsWith('tidgi');
  const servicesExposed = Boolean(window.service.wiki);
  const hasWorkspaceIDinMeta = Boolean((typeof window.meta === 'function' ? window.meta() as WindowMeta[WindowNames.view] : undefined)?.workspace?.id);
  if (isInTidGi && servicesExposed && hasWorkspaceIDinMeta) {
    // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
    exports.adaptorClass = TidGiIPCSyncAdaptor;
  }
}