import React, { useEffect } from 'react';
import {
    View,
    TouchableOpacity,
    StyleSheet,
    Dimensions,
    Platform,
} from 'react-native';
import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
import * as LucideIcons from 'lucide-react-native';
import Animated, {
    useAnimatedStyle,
    useSharedValue,
    withSpring,
    withTiming,
    interpolate,
    Extrapolation
} from 'react-native-reanimated';
import Screens from '../Screens';

import NavigationString from '../Constant/NavigationString';
import { useTheme } from '../Hooks/useTheme';
import { typography } from '../theme/typography';
// import EditableExcel from '../Screens/Tender/Component/EnvelopeCExcelPreview';

const Tab = createBottomTabNavigator();

const TabButton = ({ route, isFocused, onPress }: any) => {
    const { colors } = useTheme();
    const icons: Record<string, { outline: keyof typeof LucideIcons; filled: keyof typeof LucideIcons }> = {
        Home: { outline: "House", filled: "House" },
        Auction: { outline: "Gavel", filled: "Gavel" },
        Tender: { outline: "FileText", filled: "FileText" },
        Profile: { outline: "User", filled: "User" },

    };
    // Lucide icons don't always have 'filled' variants in the set, so we might use the same icon
    // or rely on color/strokeWidth to indicate state.
    const iconKey = icons[route.name]?.outline || "HelpCircle"; // Fallback
    const IconName = LucideIcons[iconKey] as React.ElementType;

    const scale = useSharedValue(0);
    const translateY = useSharedValue(0);

    useEffect(() => {
        if (isFocused) {
            scale.value = withSpring(1, { damping: 12, stiffness: 100 });
            translateY.value = withSpring(-4, { damping: 12, stiffness: 100 });
        } else {
            scale.value = withTiming(0, { duration: 200 });
            translateY.value = withSpring(0, { damping: 12, stiffness: 100 });
        }
    // Intentionally runs only when isFocused changes; other deps are stable or recreated each render.
    // eslint-disable-next-line react-hooks/exhaustive-deps
    }, [isFocused]);

    useAnimatedStyle(() => {
        return {
            transform: [{ scale: scale.value }],
            opacity: interpolate(scale.value, [0, 1], [0, 1], Extrapolation.CLAMP),
        };
    });

    const animatedIconStyle = useAnimatedStyle(() => {
        return {
            transform: [{ scale: interpolate(scale.value, [0, 1], [1, 0.9]) }], // Slight shrink on press
        };
    });

    const animatedTextStyle = useAnimatedStyle(() => {
        const opacity = interpolate(scale.value, [0, 1], [0, 1]);
        const translateX = interpolate(scale.value, [0, 1], [20, 0]); // Slide in from right
        return {
            opacity,
            transform: [{ translateX }],
            display: scale.value === 0 ? 'none' : 'flex', // Hide when inactive
            marginLeft: 4, // Reduced space
        };
    });

    return (
        <TouchableOpacity
            onPress={onPress}
            style={styles.tabButton}
            activeOpacity={0.8}
            accessibilityRole="tab"
            accessibilityState={{ selected: isFocused }}
            accessibilityLabel={`${route.name} tab`}
        >
            <View style={styles.tabContent}>
                <Animated.View style={animatedIconStyle}>
                    {IconName && (
                        <IconName
                            size={24}
                            color={isFocused ? colors.primary : colors.text}
                            strokeWidth={isFocused ? 2.5 : 2}
                        />
                    )}
                </Animated.View>

                {isFocused && (
                    <Animated.Text
                        style={[
                            styles.label,
                            animatedTextStyle,
                            {
                                color: colors.primary,
                                fontFamily: typography.fonts.medium,
                                fontWeight: undefined, // Remove fontWeight as we use fontFamily
                            },
                        ]}
                        numberOfLines={1}
                    >
                        {route.name === 'BrandDay' ? 'Coupons' : route.name}
                    </Animated.Text>
                )}
            </View>
        </TouchableOpacity>
    );
};

const CustomTabBar = ({ state, navigation }: any) => {
    const { colors } = useTheme();
    const { width: windowWidth } = Dimensions.get('window');
    const TAB_BAR_WIDTH = windowWidth - 40; // 20 margin each side
    const TAB_PADDING_H = 10; // 5 padding left + 5 padding right
    const TAB_WIDTH = (TAB_BAR_WIDTH - TAB_PADDING_H) / state.routes.length;

    const translateX = useSharedValue(0);

    useEffect(() => {
        translateX.value = withSpring(state.index * TAB_WIDTH, {
            damping: 15,
            stiffness: 150,
            mass: 0.5,
        });
    // Intentionally runs only when the selected tab index changes; other deps are stable or recreated each render.
    // eslint-disable-next-line react-hooks/exhaustive-deps
    }, [state.index]);

    const animatedIndicatorStyle = useAnimatedStyle(() => {
        return {
            transform: [{ translateX: translateX.value }],
        };
    });

    return (
        <View style={[
            styles.tabBar,
            {
                backgroundColor: colors.background, // Use transparent to allow shadow to show
                shadowColor: colors.shadow, // Dynamic shadow color
                shadowOffset: { width: 0, height: 10 },
                shadowOpacity: 0.2, // Consistent opacity
                shadowRadius: 10,
                borderColor: colors.border, // Subtle border for definition
                borderWidth: 3,
                elevation: 20,
            }
        ]}>
            <Animated.View
                style={[
                    styles.slidingIndicator,
                    {
                        width: TAB_WIDTH,
                        backgroundColor: colors.primary,
                        opacity: 0.3,
                        elevation: 10, // Subtle elevation for the indicator
                    },
                    animatedIndicatorStyle,
                ]}
            />
            {state.routes.map((route: any, index: number) => {
                const isFocused = state.index === index;

                return (
                    <TabButton
                        key={route.key}
                        route={route}
                        isFocused={isFocused}
                        onPress={() => navigation.navigate(route.name)}
                    />
                );
            })}
        </View>
    );
};

export default function BottomTab() {
    const { colors } = useTheme();
    return (
        <View style={[styles.container, { backgroundColor: colors.background }]}>
            <Tab.Navigator
                tabBar={(props) => <CustomTabBar {...props} />}
                screenOptions={{
                    headerShown: false,
                    tabBarHideOnKeyboard: true,
                    // Smooth cross-fade when switching tabs instead of an instant cut.
                    animation: 'shift',
                }}
            >
                <Tab.Screen name="Home" component={Screens.Home} />
                <Tab.Screen name={NavigationString.Auction} component={Screens.Auction} />
                <Tab.Screen name={NavigationString.Tender} component={Screens.Tender} />
                {/* <Tab.Screen name={'EditableExcel'} component={EditableExcel} /> */}
                <Tab.Screen name={NavigationString.Profile} component={Screens.ProfileTab} />

            </Tab.Navigator>
        </View>
    );
}

const styles = StyleSheet.create({
    container: {
        flex: 1,

    },
    tabBar: {
        position: 'absolute',
        bottom: 20,
        left: 20,
        right: 20,
        flexDirection: 'row',
        height: 70,
        borderRadius: 35,
        elevation: 20, // stronger Android elevation
        shadowColor: '#000', // iOS shadow color
        shadowOffset: { width: 0, height: 10 },
        shadowOpacity: Platform.OS === 'ios' ? 0.25 : 0.2,
        shadowRadius: 12,
        overflow: 'visible', // allow shadow to render outside rounded corners
        zIndex: 9999,
        paddingBottom: 0,
        justifyContent: 'space-around',
        alignItems: 'center',
        paddingHorizontal: 5,
    },
    tabButton: {
        flex: 1,
        justifyContent: 'center',
        alignItems: 'center',
        height: '100%',
    },
    tabContent: {
        flexDirection: 'row',
        alignItems: 'center',
        justifyContent: 'center',
        paddingHorizontal: 4, // Drastically reduced from 12
        paddingVertical: 4,
        borderRadius: 20,
    },
    slidingIndicator: {
        position: 'absolute',
        top: 12,
        left: 5,
        height: 40,
        borderRadius: 30,
        zIndex: 0,
    },
    label: {
        fontSize: 11, // Slightly smaller text
        textAlign: 'left',
        textTransform: 'capitalize',
        letterSpacing: 0.2, // Tighter spacing
    },
});