import * as plugins from './plugins.js';
import * as appstate from './appstate.js';

const SmartRouter = plugins.domtools.plugins.smartrouter.SmartRouter;

export const validViews = ['overview', 'network', 'emails', 'logs', 'configuration', 'security'] as const;
export const validEmailFolders = ['queued', 'sent', 'failed', 'security'] as const;

export type TValidView = typeof validViews[number];
export type TValidEmailFolder = typeof validEmailFolders[number];

class AppRouter {
  private router: InstanceType<typeof SmartRouter>;
  private initialized = false;
  private suppressStateUpdate = false;

  constructor() {
    this.router = new SmartRouter({ debug: false });
  }

  public init(): void {
    if (this.initialized) return;
    this.setupRoutes();
    this.setupStateSync();
    this.handleInitialRoute();
    this.initialized = true;
  }

  private setupRoutes(): void {
    // Main views
    for (const view of validViews) {
      if (view === 'emails') {
        // Email root - default to queued
        this.router.on('/emails', async () => {
          this.updateViewState('emails');
          this.updateEmailFolder('queued');
        });

        // Email with folder parameter
        this.router.on('/emails/:folder', async (routeInfo) => {
          const folder = routeInfo.params.folder as string;
          if (validEmailFolders.includes(folder as TValidEmailFolder)) {
            this.updateViewState('emails');
            this.updateEmailFolder(folder as TValidEmailFolder);
          } else {
            // Invalid folder, redirect to queued
            this.navigateTo('/emails/queued');
          }
        });
      } else {
        this.router.on(`/${view}`, async () => {
          this.updateViewState(view);
        });
      }
    }

    // Root redirect
    this.router.on('/', async () => {
      this.navigateTo('/overview');
    });
  }

  private setupStateSync(): void {
    // Sync URL when state changes programmatically (not from router)
    appstate.uiStatePart.state.subscribe((uiState) => {
      if (this.suppressStateUpdate) return;

      const currentPath = window.location.pathname;
      const expectedPath = this.getExpectedPath(uiState.activeView);

      // Only update URL if it doesn't match current state
      if (!currentPath.startsWith(expectedPath)) {
        this.suppressStateUpdate = true;
        if (uiState.activeView === 'emails') {
          const emailState = appstate.emailOpsStatePart.getState();
          this.router.pushUrl(`/emails/${emailState.currentView}`);
        } else {
          this.router.pushUrl(`/${uiState.activeView}`);
        }
        this.suppressStateUpdate = false;
      }
    });
  }

  private getExpectedPath(view: string): string {
    if (view === 'emails') {
      return '/emails';
    }
    return `/${view}`;
  }

  private handleInitialRoute(): void {
    const path = window.location.pathname;

    if (!path || path === '/') {
      // Redirect root to overview
      this.router.pushUrl('/overview');
    } else {
      // Parse current path and update state
      const segments = path.split('/').filter(Boolean);
      const view = segments[0];

      if (validViews.includes(view as TValidView)) {
        this.updateViewState(view as TValidView);

        if (view === 'emails' && segments[1]) {
          const folder = segments[1];
          if (validEmailFolders.includes(folder as TValidEmailFolder)) {
            this.updateEmailFolder(folder as TValidEmailFolder);
          } else {
            this.updateEmailFolder('queued');
          }
        } else if (view === 'emails') {
          this.updateEmailFolder('queued');
        }
      } else {
        // Invalid view, redirect to overview
        this.router.pushUrl('/overview');
      }
    }
  }

  private updateViewState(view: string): void {
    this.suppressStateUpdate = true;
    const currentState = appstate.uiStatePart.getState();
    if (currentState.activeView !== view) {
      appstate.uiStatePart.setState({
        ...currentState,
        activeView: view,
      });
    }
    this.suppressStateUpdate = false;
  }

  private updateEmailFolder(folder: TValidEmailFolder): void {
    this.suppressStateUpdate = true;
    const currentState = appstate.emailOpsStatePart.getState();
    if (currentState.currentView !== folder) {
      appstate.emailOpsStatePart.setState({
        ...currentState,
        currentView: folder as appstate.IEmailOpsState['currentView'],
      });
    }
    this.suppressStateUpdate = false;
  }

  public navigateTo(path: string): void {
    this.router.pushUrl(path);
  }

  public navigateToView(view: string): void {
    if (validViews.includes(view as TValidView)) {
      this.navigateTo(`/${view}`);
    } else {
      this.navigateTo('/overview');
    }
  }

  public navigateToEmailFolder(folder: string): void {
    if (validEmailFolders.includes(folder as TValidEmailFolder)) {
      this.navigateTo(`/emails/${folder}`);
    } else {
      this.navigateTo('/emails/queued');
    }
  }

  public getCurrentView(): string {
    return appstate.uiStatePart.getState().activeView;
  }

  public getCurrentEmailFolder(): string {
    return appstate.emailOpsStatePart.getState().currentView;
  }

  public destroy(): void {
    this.router.destroy();
    this.initialized = false;
  }
}

export const appRouter = new AppRouter();