import React, { useEffect } from 'react';
import { Redirect, Route, useHistory, useLocation } from 'react-router-dom';
import {
  IonApp,
  IonIcon,
  IonLabel,
  IonRouterOutlet,
  IonTabBar,
  IonTabButton,
  IonTabs,
} from '@ionic/react';
import { IonReactRouter } from '@ionic/react-router';
import { Capacitor } from '@capacitor/core';
import { PushNotifications } from '@capacitor/push-notifications';
import type {
  ActionPerformed,
  PushNotificationSchema,
} from '@capacitor/push-notifications';
import { supabase } from './supabase';
import {
  heart,
  heartOutline,
  listOutline,
  peopleOutline,
  personOutline,
} from 'ionicons/icons';

import '@ionic/react/css/core.css';
import '@ionic/react/css/normalize.css';
import '@ionic/react/css/structure.css';
import '@ionic/react/css/typography.css';
import '@ionic/react/css/padding.css';
import '@ionic/react/css/float-elements.css';
import '@ionic/react/css/text-alignment.css';
import '@ionic/react/css/text-transformation.css';
import '@ionic/react/css/flex-utils.css';
import '@ionic/react/css/display.css';
import '@ionic/react/css/palettes/dark.system.css';
import './theme/variables.css';

import { setStatusBarStyle, Style } from './utils/statusBar';
import { AuthProvider, useAuth } from './contexts/AuthContext';
import ProtectedRoute from './components/ProtectedRoute';

// Auth Pages
import AuthPage from './pages/AuthPage';
import VerifyEmailPage from './pages/VerifyEmailPage';
import ForgotPasswordPage from './pages/ForgotPasswordPage';
import VerifyResetPage from './pages/VerifyResetPage';
import SetupProfilePage from './pages/SetupProfilePage';

// Main App Pages
import HomePage from './pages/HomePage';
import RecipientsPage from './pages/RecipientsPage';
import RecipientFormPage from './pages/RecipientFormPage';
import RecipientDetailPage from './pages/RecipientDetailPage';
import SupportFlowPage from './pages/SupportFlowPage';
import OrderDetailPage from './pages/OrderDetailPage';
import VoucherDetailPage from './pages/VoucherDetailPage';
import ActivityPage from './pages/ActivityPage';
import NotificationsPage from './pages/NotificationsPage';
import ProfilePage from './pages/ProfilePage';
import EditProfilePage from './pages/EditProfilePage';

const SetupProfileRoute: React.FC = () => {
  const { user, profileStatus } = useAuth();
  return (
    <Route
      path="/setup-profile"
      render={() => {
        if (!user) return <Redirect to="/auth" />;
        if (profileStatus === 'loading') return null;
        if (profileStatus === 'loaded') return <Redirect to="/home" />;
        return <SetupProfilePage />;
      }}
      exact
    />
  );
};

const SendSupportFab: React.FC = () => {
  const history = useHistory();
  const location = useLocation();
  const hiddenPaths = [
    '/auth',
    '/verify-email',
    '/forgot-password',
    '/verify-reset',
    '/setup-profile',
    '/support/new',
  ];
  const showOnPaths = ['/home', '/recipients', '/activity', '/profile'];
  const isVisibleRoute =
    showOnPaths.includes(location.pathname) ||
    /^\/recipients\/[0-9a-fA-F-]{36}$/.test(location.pathname);

  if (!isVisibleRoute || hiddenPaths.includes(location.pathname)) return null;

  return (
    <button
      type="button"
      className="app-send-support-fab"
      aria-label="Send support"
      onClick={() => history.push('/support/new')}
    >
      <IonIcon icon={heart} />
    </button>
  );
};

const PushNotificationHandler: React.FC = () => {
  const { user, profile } = useAuth();
  const history = useHistory();

  useEffect(() => {
    if (!Capacitor.isNativePlatform() || !user || !profile) return;

    const setupPush = async () => {
      const handleNotificationTap = (notification: PushNotificationSchema) => {
        const { orderId, voucherId, screen } = notification.data || {};
        if (voucherId) {
          history.push(`/voucher/${voucherId}`, { parentRoot: '/home' });
        } else if (orderId) {
          history.push(`/orders/${orderId}`, { parentRoot: '/home' });
        } else if (screen) {
          history.push(screen, { parentRoot: '/home' });
        }
      };

      // Capacitor automatically triggers pushNotificationActionPerformed
      // for the notification that launched the app once the listener is attached.

      // Check if user has explicitly enabled push notifications
      if (!profile.notification_push_enabled) return;

      const status = await PushNotifications.checkPermissions();
      if (status.receive === 'granted') {
        await PushNotifications.register();
      } else if (status.receive === 'prompt') {
        const result = await PushNotifications.requestPermissions();
        if (result.receive === 'granted') {
          await PushNotifications.register();
        }
      }

      PushNotifications.addListener('registration', async (token) => {
        await supabase
          .from('profiles')
          .update({ fcm_token: token.value })
          .eq('id', user.id);
      });

      PushNotifications.addListener('registrationError', (err) => {
        console.error('Push registration error:', err);
      });

      PushNotifications.addListener('pushNotificationReceived', () => {
        // Handled natively via presentationOptions banner
      });

      PushNotifications.addListener(
        'pushNotificationActionPerformed',
        (action: ActionPerformed) => {
          handleNotificationTap(action.notification);
        }
      );

      await PushNotifications.removeAllDeliveredNotifications();
    };

    setupPush();

    return () => {
      if (Capacitor.isNativePlatform()) {
        PushNotifications.removeAllListeners();
      }
    };
  }, [user, profile, history]);

  return null;
};

const RootRedirect: React.FC = () => {
  const { user, profileStatus } = useAuth();

  if (!user) return <Redirect to="/auth" />;
  if (profileStatus === 'loading') return null;
  if (profileStatus === 'missing') {
    return <Redirect to="/setup-profile" />;
  }
  return <Redirect to="/home" />;
};

const App: React.FC = () => {
  useEffect(() => {
    setStatusBarStyle(Style.Light);
  }, []);

  return (
    <IonApp>
      <AuthProvider>
        <IonReactRouter>
          <IonRouterOutlet>
            {/* Auth Routes */}
            <Route path="/auth" component={AuthPage} exact />
            <Route path="/verify-email" component={VerifyEmailPage} exact />
            <Route
              path="/forgot-password"
              component={ForgotPasswordPage}
              exact
            />
            <Route path="/verify-reset" component={VerifyResetPage} exact />

            {/* Setup Profile Route - Requires authenticated user but not necessarily complete profile */}
            <SetupProfileRoute />

            {/* Top-level Protected Routes (no tab bar) */}
            <ProtectedRoute
              path="/support/new"
              component={SupportFlowPage}
              exact
            />
            <ProtectedRoute
              path="/orders/:id([0-9a-fA-F-]{36})"
              component={OrderDetailPage}
              exact
            />
            <ProtectedRoute
              path="/recipients/new"
              component={RecipientFormPage}
              exact
            />
            <ProtectedRoute
              path="/recipients/:id([0-9a-fA-F-]{36})"
              component={RecipientDetailPage}
              exact
            />
            <ProtectedRoute
              path="/recipients/:id([0-9a-fA-F-]{36})/edit"
              component={RecipientFormPage}
              exact
            />
            <ProtectedRoute
              path="/profile/edit"
              component={EditProfilePage}
              exact
            />
            <ProtectedRoute
              path="/notifications"
              component={NotificationsPage}
              exact
            />
            <ProtectedRoute
              path="/voucher/:id([0-9a-fA-F-]{36})"
              component={VoucherDetailPage}
              exact
            />

            {/* Tab Routes */}
            <ProtectedRoute
              path={['/home', '/recipients', '/activity', '/profile']}
              exact
              component={() => (
                <IonTabs>
                  <IonRouterOutlet>
                    <Route path="/home" component={HomePage} exact />
                    <Route
                      path="/recipients"
                      component={RecipientsPage}
                      exact
                    />
                    <Route path="/activity" component={ActivityPage} exact />
                    <Route path="/profile" component={ProfilePage} exact />
                  </IonRouterOutlet>

                  <IonTabBar slot="bottom" className="app-tab-bar">
                    <IonTabButton tab="home" href="/home">
                      <IonIcon icon={heartOutline} />
                      <IonLabel>Care</IonLabel>
                    </IonTabButton>
                    <IonTabButton tab="recipients" href="/recipients">
                      <IonIcon icon={peopleOutline} />
                      <IonLabel>Recipients</IonLabel>
                    </IonTabButton>
                    <IonTabButton disabled tab="send-support-fab" />
                    <IonTabButton tab="activity" href="/activity">
                      <IonIcon icon={listOutline} />
                      <IonLabel>Activity</IonLabel>
                    </IonTabButton>
                    <IonTabButton tab="profile" href="/profile">
                      <IonIcon icon={personOutline} />
                      <IonLabel>Profile</IonLabel>
                    </IonTabButton>
                  </IonTabBar>
                </IonTabs>
              )}
            />

            {/* Orders Redirect */}
            <Route
              exact
              path="/orders"
              render={() => <Redirect to="/activity" />}
            />

            {/* Root Redirect */}
            <Route exact path="/" component={RootRedirect} />
          </IonRouterOutlet>
          <SendSupportFab />
          <PushNotificationHandler />
        </IonReactRouter>
      </AuthProvider>
    </IonApp>
  );
};

export default App;