import React from 'react';
import { ActivityIndicator, View, StyleSheet, Linking } from 'react-native';
import { NavigationContainer, LinkingOptions } from '@react-navigation/native';
import { createNativeStackNavigator } from '@react-navigation/native-stack';
import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
import { Text } from 'react-native';

import { useAuth } from '../contexts/AuthContext';
import { colors, fontSize } from '../constants/theme';

// Deep linking configuration
const linking: LinkingOptions<RootStackParamList> = {
  prefixes: ['michangarrito://', 'https://michangarrito.com'],
  config: {
    screens: {
      Main: {
        screens: {
          Dashboard: 'dashboard',
          POS: 'pos',
          Reports: 'reports',
          More: 'more',
        },
      },
      Products: 'products',
      Inventory: 'inventory',
      Customers: 'customers',
      Settings: 'settings',
      BarcodeScanner: 'scan',
    },
  },
  async getInitialURL() {
    // Handle app opened from deep link
    const url = await Linking.getInitialURL();
    if (url != null) {
      return url;
    }
    return null;
  },
  subscribe(listener) {
    // Listen to incoming links while app is open
    const subscription = Linking.addEventListener('url', ({ url }) => {
      listener(url);
    });
    return () => {
      subscription.remove();
    };
  },
};

// Screens
import LoginScreen from '../screens/LoginScreen';
import DashboardScreen from '../screens/DashboardScreen';
import POSScreen from '../screens/POSScreen';
import MoreScreen from '../screens/MoreScreen';
import ProductsScreen from '../screens/ProductsScreen';
import InventoryScreen from '../screens/InventoryScreen';
import CustomersScreen from '../screens/CustomersScreen';
import ReportsScreen from '../screens/ReportsScreen';
import SettingsScreen from '../screens/SettingsScreen';
import BarcodeScannerScreen from '../screens/BarcodeScannerScreen';

// Type definitions
export type RootStackParamList = {
  Auth: undefined;
  Main: undefined;
  Products: undefined;
  Inventory: undefined;
  Customers: undefined;
  Reports: undefined;
  Settings: undefined;
  BarcodeScanner: { onScan?: (barcode: string) => void };
};

export type MainTabParamList = {
  Dashboard: undefined;
  POS: undefined;
  Reports: undefined;
  More: undefined;
};

const Stack = createNativeStackNavigator<RootStackParamList>();
const Tab = createBottomTabNavigator<MainTabParamList>();

// Tab Icon Component
const TabIcon = ({ name, focused }: { name: string; focused: boolean }) => {
  const icons: Record<string, string> = {
    Dashboard: '🏠',
    POS: '🛒',
    Reports: '📊',
    More: '☰',
  };

  return (
    <Text style={{ fontSize: focused ? 24 : 20 }}>
      {icons[name] || '•'}
    </Text>
  );
};

// Main Tab Navigator
function MainTabs() {
  return (
    <Tab.Navigator
      screenOptions={({ route }) => ({
        tabBarIcon: ({ focused }) => (
          <TabIcon name={route.name} focused={focused} />
        ),
        tabBarActiveTintColor: colors.primary,
        tabBarInactiveTintColor: colors.textMuted,
        tabBarStyle: {
          backgroundColor: colors.surface,
          borderTopColor: colors.border,
          paddingTop: 8,
          height: 60,
        },
        tabBarLabelStyle: {
          fontSize: fontSize.xs,
          fontWeight: '500',
        },
        headerShown: false,
      })}
    >
      <Tab.Screen
        name="Dashboard"
        component={DashboardScreen}
        options={{ tabBarLabel: 'Inicio' }}
      />
      <Tab.Screen
        name="POS"
        component={POSScreen}
        options={{ tabBarLabel: 'Vender' }}
      />
      <Tab.Screen
        name="Reports"
        component={ReportsScreen}
        options={{ tabBarLabel: 'Reportes' }}
      />
      <Tab.Screen
        name="More"
        component={MoreScreen}
        options={{ tabBarLabel: 'Mas' }}
      />
    </Tab.Navigator>
  );
}

// Loading Screen
function LoadingScreen() {
  return (
    <View style={styles.loadingContainer}>
      <ActivityIndicator size="large" color={colors.primary} />
    </View>
  );
}

// Main App Navigator
export default function AppNavigator() {
  const { isAuthenticated, isLoading } = useAuth();

  if (isLoading) {
    return <LoadingScreen />;
  }

  return (
    <NavigationContainer linking={linking}>
      <Stack.Navigator screenOptions={{ headerShown: false }}>
        {isAuthenticated ? (
          <>
            <Stack.Screen name="Main" component={MainTabs} />
            <Stack.Screen
              name="Products"
              component={ProductsScreen}
              options={{
                headerShown: true,
                headerTitle: 'Productos',
                headerBackTitle: 'Atras',
                headerStyle: { backgroundColor: colors.surface },
                headerTintColor: colors.text,
              }}
            />
            <Stack.Screen
              name="Inventory"
              component={InventoryScreen}
              options={{
                headerShown: true,
                headerTitle: 'Inventario',
                headerBackTitle: 'Atras',
                headerStyle: { backgroundColor: colors.surface },
                headerTintColor: colors.text,
              }}
            />
            <Stack.Screen
              name="Customers"
              component={CustomersScreen}
              options={{
                headerShown: true,
                headerTitle: 'Clientes',
                headerBackTitle: 'Atras',
                headerStyle: { backgroundColor: colors.surface },
                headerTintColor: colors.text,
              }}
            />
            <Stack.Screen
              name="Settings"
              component={SettingsScreen}
              options={{
                headerShown: true,
                headerTitle: 'Ajustes',
                headerBackTitle: 'Atras',
                headerStyle: { backgroundColor: colors.surface },
                headerTintColor: colors.text,
              }}
            />
            <Stack.Screen
              name="BarcodeScanner"
              component={BarcodeScannerScreen}
              options={{
                headerShown: true,
                headerTitle: 'Escanear Codigo',
                headerBackTitle: 'Cancelar',
                headerStyle: { backgroundColor: colors.surface },
                headerTintColor: colors.text,
                presentation: 'modal',
              }}
            />
          </>
        ) : (
          <Stack.Screen name="Auth" component={LoginScreen} />
        )}
      </Stack.Navigator>
    </NavigationContainer>
  );
}

const styles = StyleSheet.create({
  loadingContainer: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: colors.background,
  },
});