import { Injectable, inject } from '@angular/core';

import { PlatformService } from '../../core/platform';
import { clearStoredLocalAppData } from '../../core/storage/current-user-storage';
import { DatabaseService } from './database.service';
import { UserLogoutService } from '../../domains/authentication/application/services/user-logout.service';
import { AuthTokenStoreService } from '../../domains/authentication/application/services/auth-token-store.service';
import { loadCapacitorAttachmentFilesystem } from '../../domains/attachment/infrastructure/services/capacitor-attachment-filesystem.adapter';

const CAPACITOR_APP_DATA_ROOT = 'metoyou';

export interface EraseLocalUserDataResult {
  restartRequired: boolean;
}

@Injectable({ providedIn: 'root' })
export class LocalUserDataService {
  private readonly platform = inject(PlatformService);
  private readonly database = inject(DatabaseService);
  private readonly userLogout = inject(UserLogoutService);
  private readonly authTokenStore = inject(AuthTokenStoreService);

  async eraseLocalUserData(): Promise<EraseLocalUserDataResult> {
    if (!this.platform.isCapacitor) {
      throw new Error('Local user data erase is only supported on native mobile shells.');
    }

    await this.database.clearAllData();
    await this.deleteCapacitorAttachmentTree();
    this.authTokenStore.clearAllTokens();
    clearStoredLocalAppData();
    this.userLogout.logout();

    return { restartRequired: false };
  }

  private async deleteCapacitorAttachmentTree(): Promise<void> {
    const filesystem = await loadCapacitorAttachmentFilesystem();

    if (!filesystem) {
      return;
    }

    try {
      await filesystem.filesystem.rmdir({
        path: CAPACITOR_APP_DATA_ROOT,
        directory: filesystem.directory,
        recursive: true
      });
    } catch {
      // Missing directory is fine during erase.
    }
  }
}