/*
 * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
 *
 * SPDX-License-Identifier: EPL-2.0
 */

import { getLogger } from 'loglevel';
import {
  IReactionDisposer,
  autorun,
  makeAutoObservable,
  runInAction,
} from 'mobx';

import PWAStore from './PWAStore';
import type EditorStore from './editor/EditorStore';
import ExportSettingsScotre from './graph/export/ExportSettingsStore';
import Compressor from './persistence/Compressor';
import ThemeStore from './theme/ThemeStore';

const log = getLogger('RootStore');

export default class RootStore {
  private readonly compressor = new Compressor((text) =>
    this.setInitialValue(text),
  );

  private initialValue: string | undefined;

  private editorStoreClass: typeof EditorStore | undefined;

  editorStore: EditorStore | undefined;

  readonly pwaStore: PWAStore;

  readonly themeStore: ThemeStore;

  readonly exportSettingsStore: ExportSettingsScotre;

  disposed = false;

  private titleReaction: IReactionDisposer | undefined;

  constructor() {
    this.pwaStore = new PWAStore();
    this.themeStore = new ThemeStore();
    this.exportSettingsStore = new ExportSettingsScotre();
    makeAutoObservable<
      RootStore,
      'compressor' | 'editorStoreClass' | 'titleReaction'
    >(this, {
      compressor: false,
      editorStoreClass: false,
      pwaStore: false,
      themeStore: false,
      exportSettingsStore: false,
      titleReaction: false,
    });
    (async () => {
      const { default: EditorStore } = await import('./editor/EditorStore');
      runInAction(() => {
        if (this.disposed) {
          return;
        }
        this.editorStoreClass = EditorStore;
        if (this.initialValue !== undefined) {
          this.setInitialValue(this.initialValue);
        }
      });
    })().catch((error) => {
      log.error('Failed to load EditorStore', error);
    });
    this.compressor.decompressInitial();
  }

  private setInitialValue(initialValue: string): void {
    this.initialValue = initialValue;
    if (this.editorStoreClass !== undefined) {
      const EditorStore = this.editorStoreClass;
      const editorStore = new EditorStore(
        this.initialValue,
        this.pwaStore,
        (text) => this.compressor.compress(text),
      );
      this.editorStore = editorStore;
      this.titleReaction?.();
      this.titleReaction = autorun(() => {
        const { simpleName, unsavedChanges } = editorStore;
        if (simpleName === undefined) {
          document.title = 'Refinery';
        } else {
          // Chromium web apps don't like whe the file name precedes the app name,
          // and turn `filename - Refinery` into `Refinery - filename - Refinery`.
          // We elect to use just `Refinery - filename` instead.
          // Change indicator in a style similar to VSCodium.
          document.title = `Refinery - ${unsavedChanges ? '\u25cf ' : ''}${simpleName}`;
        }
      });
    }
  }

  dispose(): void {
    if (this.disposed) {
      return;
    }
    this.titleReaction?.();
    this.editorStore?.dispose();
    this.compressor.dispose();
    this.disposed = true;
  }
}