import { useEffect } from 'react';
import { App } from '@capacitor/app';

const OAUTH_DOMAIN = 'foxsky.app';
const DEEP_LINK_HOST: string = `${OAUTH_DOMAIN}`;

export function useAndroidBackButton() {
  useEffect(() => {
    if (typeof window === 'undefined') return;

    const listeners: Awaited<ReturnType<typeof App.addListener>>[] = [];

    App.addListener('backButton', ({ canGoBack }) => {
      if (canGoBack) {
        window.history.back();
      } else {
        App.minimizeApp();
      }
    }).then((handle) => {
      listeners.push(handle);
    });

    App.addListener('appUrlOpen', (data) => {
      if (data?.url) {
        navigateToPath(data.url);
      }
    }).then((handle) => {
      listeners.push(handle);
    });

    App.getLaunchUrl().then((result) => {
      if (result?.url) {
        navigateToPath(result.url);
      }
    });

    return () => {
      for (const l of listeners) {
        l.remove();
      }
    };
  }, []);
}

function navigateToPath(fullUrl: string) {
  try {
    const url = new URL(fullUrl);
    const allowedHosts = [DEEP_LINK_HOST, 'localhost'];
    if (!allowedHosts.includes(url.hostname)) return;

    const path = url.pathname + url.search + url.hash;

    if (
      path.startsWith('/profile/') ||
      path.startsWith('/post/') ||
      path.startsWith('/search') ||
      path.startsWith('/notifications') ||
      path.startsWith('/settings')
    ) {
      window.history.pushState(null, '', path);
      window.dispatchEvent(new PopStateEvent('popstate', { state: null }));
    }
  } catch {
    // Invalid URL – ignore
  }
}