import React, { useEffect, useRef } from 'react';
import { View, Text, StyleSheet, ScrollView } from 'react-native';
import Animated, {
  useSharedValue,
  useAnimatedStyle,
  withRepeat,
  withTiming,
  Easing,
} from 'react-native-reanimated';
import { TrendingUp } from 'lucide-react-native';
import { Colors, Fonts, FontSize, BorderRadius } from '@/constants/theme';
import { marketTicker } from '@/constants/mockData';

export default function MarketTicker() {
  const translateX = useSharedValue(0);

  useEffect(() => {
    translateX.value = withRepeat(
      withTiming(-600, { duration: 30000, easing: Easing.linear }),
      -1
    );
  }, []);

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

  const items = [...marketTicker, ...marketTicker, ...marketTicker];

  return (
    <View style={styles.container}>
      <View style={styles.header}>
        <TrendingUp size={14} color={Colors.accent.green} />
        <Text style={styles.headerText}>MARKET PULSE</Text>
      </View>
      <View style={styles.tickerWrap}>
        <Animated.View style={[styles.tickerRow, animStyle]}>
          {items.map((item, index) => {
            const isPositive = item.change >= 0;
            return (
              <View key={`${item.symbol}-${index}`} style={styles.tickerItem}>
                <Text style={styles.symbol}>{item.symbol}</Text>
                <Text style={styles.price}>
                  ${item.price >= 1 ? item.price.toLocaleString('en-US', { minimumFractionDigits: 2 }) : item.price.toFixed(4)}
                </Text>
                <Text style={[styles.change, { color: isPositive ? Colors.accent.green : Colors.accent.red }]}>
                  {isPositive ? '▲' : '▼'} {isPositive ? '+' : ''}{item.change.toFixed(2)}%
                </Text>
              </View>
            );
          })}
        </Animated.View>
      </View>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    backgroundColor: Colors.background.card,
    borderRadius: BorderRadius.small,
    padding: 14,
    borderWidth: 1,
    borderColor: Colors.border.default,
  },
  header: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 6,
    marginBottom: 12,
  },
  headerText: {
    fontFamily: Fonts.inter.black,
    fontSize: FontSize.micro,
    color: Colors.accent.green,
    letterSpacing: 1.5,
  },
  tickerWrap: {
    overflow: 'hidden',
  },
  tickerRow: {
    flexDirection: 'row',
    gap: 24,
  },
  tickerItem: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 8,
  },
  symbol: {
    fontFamily: Fonts.inter.extraBold,
    fontSize: FontSize.badge,
    color: Colors.text.primary,
  },
  price: {
    fontFamily: Fonts.mono.medium,
    fontSize: FontSize.badge,
    color: Colors.text.primary,
  },
  change: {
    fontFamily: Fonts.mono.bold,
    fontSize: FontSize.badge,
  },
});
