import 'react-native-gesture-handler';
import React, { useEffect, useState } from 'react';
import { StatusBar, ActivityIndicator, View } from 'react-native';
import {
  NavigationContainer,
  DefaultTheme,
  Theme,
} from '@react-navigation/native';
import { createNativeStackNavigator } from '@react-navigation/native-stack';
import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
import MaterialCommunityIcons from 'react-native-vector-icons/MaterialCommunityIcons';
import { SafeAreaProvider } from 'react-native-safe-area-context';
import { GestureHandlerRootView } from 'react-native-gesture-handler';
import { useTranslation } from 'react-i18next';
import { initI18n } from './src/i18n/config';

import {
  WelcomeScreen,
  LoginScreen,
  SignupScreen,
  BusinessSetupScreen,
  HomeScreen,
  AgentsScreen,
  DocumentsScreen,
  GenerateScreen,
  ProfileScreen,
  TasksScreen,
} from './src/screens';
import {
  MainTabParamList,
  MoreStackParamList,
  RootStackParamList,
} from './src/types/navigation';
import { colors } from './src/theme/colors';

const RootStack = createNativeStackNavigator<RootStackParamList>();
const Tab = createBottomTabNavigator<MainTabParamList>();
const MoreStack = createNativeStackNavigator<MoreStackParamList>();

const navigationTheme: Theme = {
  ...DefaultTheme,
  colors: {
    ...DefaultTheme.colors,
    background: colors.background,
    card: colors.surface,
    primary: colors.highlight,
    text: colors.textPrimary,
    border: colors.border,
  },
};

function MoreNavigator() {
  return (
    <MoreStack.Navigator screenOptions={{ headerShown: false }}>
      <MoreStack.Screen name="Profile" component={ProfileScreen} />
      <MoreStack.Screen name="Generate" component={GenerateScreen} />
    </MoreStack.Navigator>
  );
}

function MainTabs() {
  const { t } = useTranslation();
  
  return (
    <Tab.Navigator
      screenOptions={({ route }) => ({
        headerShown: false,
        tabBarActiveTintColor: colors.highlightAlt,
        tabBarInactiveTintColor: colors.tabIconInactive,
        tabBarStyle: {
          backgroundColor: colors.surfaceAlt,
          borderTopColor: colors.borderStrong,
          borderTopWidth: 1.5,
          height: 65,
          paddingBottom: 6,
          paddingTop: 6,
          shadowColor: colors.shadow,
          shadowOffset: { width: 0, height: -4 },
          shadowOpacity: 0.2,
          shadowRadius: 12,
          elevation: 10,
          position: 'absolute',
          bottom: 10,
          left: 0,
          right: 0,
        },
        tabBarLabelStyle: {
          fontSize: 11,
          fontWeight: '700',
          letterSpacing: 0.5,
          textTransform: 'uppercase',
        },
        tabBarIcon: ({ color, size, focused }) => {
          const iconMap: Record<keyof MainTabParamList, { filled: string; outline: string }> = {
            Home: { filled: 'home', outline: 'home-variant-outline' },
            Agents: { filled: 'robot', outline: 'robot-outline' },
            Tasks: { filled: 'clipboard-text', outline: 'clipboard-text-outline' },
            Documents: { filled: 'file-document', outline: 'file-document-outline' },
            More: { filled: 'dots-horizontal-circle', outline: 'dots-horizontal-circle-outline' },
          };
          const icons = iconMap[route.name as keyof MainTabParamList];
          const iconName = focused ? icons.filled : icons.outline;
          return (
            <MaterialCommunityIcons
              name={iconName}
              size={focused ? size + 2 : size}
              color={color}
            />
          );
        },
      })}
    >
      <Tab.Screen 
        name="Home" 
        component={HomeScreen}
        options={{ tabBarLabel: t('home') }}
      />
      <Tab.Screen 
        name="Agents" 
        component={AgentsScreen}
        options={{ tabBarLabel: t('agents') }}
      />
      <Tab.Screen 
        name="Tasks" 
        component={TasksScreen}
        options={{ tabBarLabel: t('tasks') }}
      />
      <Tab.Screen 
        name="Documents" 
        component={DocumentsScreen}
        options={{ tabBarLabel: t('documents') }}
      />
      <Tab.Screen 
        name="More" 
        component={MoreNavigator}
        options={{ tabBarLabel: t('more') }}
      />
    </Tab.Navigator>
  );
}

function App(): React.JSX.Element {
  const [isI18nInitialized, setIsI18nInitialized] = useState(false);

  useEffect(() => {
    initI18n()
      .then(() => {
        setIsI18nInitialized(true);
      })
      .catch((error) => {
        console.error('Failed to initialize i18n:', error);
        setIsI18nInitialized(true); // Continue anyway with default language
      });
  }, []);

  if (!isI18nInitialized) {
    return (
      <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center', backgroundColor: colors.background }}>
        <ActivityIndicator size="large" color={colors.highlight} />
      </View>
    );
  }

  return (
    <GestureHandlerRootView style={{ flex: 1 }}>
      <SafeAreaProvider>
        <StatusBar barStyle="light-content" backgroundColor={colors.background} />
        <NavigationContainer theme={navigationTheme}>
          <RootStack.Navigator screenOptions={{ headerShown: false }}>
            <RootStack.Screen name="Welcome" component={WelcomeScreen} />
            <RootStack.Screen name="Login" component={LoginScreen} />
            <RootStack.Screen name="Signup" component={SignupScreen} />
            <RootStack.Screen name="BusinessSetup" component={BusinessSetupScreen} />
            <RootStack.Screen name="MainTabs" component={MainTabs} />
          </RootStack.Navigator>
        </NavigationContainer>
      </SafeAreaProvider>
    </GestureHandlerRootView>
  );
}

export default App;