import React, { useEffect, useMemo, useRef, useState } from 'react';
import {
  Animated,
  Easing,
  LayoutChangeEvent,
  StyleProp,
  StyleSheet,
  Text,
  TextProps,
  TextStyle,
  View,
  ViewStyle,
} from 'react-native';

interface MarqueeTextProps extends Omit<TextProps, 'style'> {
  text: string;
  enabled?: boolean;
  style?: StyleProp<TextStyle>;
  containerStyle?: StyleProp<ViewStyle>;
  gap?: number;
  speed?: number;
  initialDelayMs?: number;
}

export const MarqueeText: React.FC<MarqueeTextProps> = ({
  text,
  enabled = false,
  style,
  containerStyle,
  gap = 40,
  speed = 28,
  initialDelayMs = 1200,
  ...textProps
}) => {
  const translateX = useRef(new Animated.Value(0)).current;
  const animationRef = useRef<Animated.CompositeAnimation | null>(null);
  const [containerWidth, setContainerWidth] = useState(0);
  const [textWidth, setTextWidth] = useState(0);

  const normalizedText = useMemo(() => String(text || ''), [text]);
  const shouldAnimate = enabled && containerWidth > 0 && textWidth > containerWidth + 4;
  const distance = Math.max(0, textWidth + gap);
  const durationMs = Math.max(6000, Math.round((distance / Math.max(speed, 1)) * 1000));

  useEffect(() => {
    animationRef.current?.stop();
    translateX.stopAnimation();
    translateX.setValue(0);

    if (!shouldAnimate || !distance) {
      return () => {
        animationRef.current?.stop();
      };
    }

    const sequence = Animated.loop(
      Animated.sequence([
        Animated.delay(initialDelayMs),
        Animated.timing(translateX, {
          toValue: -distance,
          duration: durationMs,
          easing: Easing.linear,
          useNativeDriver: true,
        }),
        Animated.delay(700),
        Animated.timing(translateX, {
          toValue: 0,
          duration: 0,
          useNativeDriver: true,
        }),
      ])
    );

    animationRef.current = sequence;
    sequence.start();

    return () => {
      sequence.stop();
      animationRef.current = null;
      translateX.stopAnimation();
      translateX.setValue(0);
    };
  }, [distance, durationMs, initialDelayMs, shouldAnimate, translateX]);

  const handleContainerLayout = (event: LayoutChangeEvent) => {
    const nextWidth = Math.round(event.nativeEvent.layout.width || 0);
    if (nextWidth !== containerWidth) {
      setContainerWidth(nextWidth);
    }
  };

  const handleTextLayout = (event: LayoutChangeEvent) => {
    const nextWidth = Math.round(event.nativeEvent.layout.width || 0);
    if (nextWidth !== textWidth) {
      setTextWidth(nextWidth);
    }
  };

  return (
    <View style={[styles.container, containerStyle]} onLayout={handleContainerLayout}>
      <Text
        {...textProps}
        style={[style, styles.measureText]}
        onLayout={handleTextLayout}
        numberOfLines={1}
      >
        {normalizedText}
      </Text>
      {shouldAnimate ? (
        <Animated.View style={[styles.track, { transform: [{ translateX }] }]}>
          <Text {...textProps} style={style} numberOfLines={1}>
            {normalizedText}
          </Text>
          <View style={{ width: gap }} />
          <Text {...textProps} style={style} numberOfLines={1}>
            {normalizedText}
          </Text>
        </Animated.View>
      ) : (
        <Text {...textProps} style={style} numberOfLines={1} ellipsizeMode="tail">
          {normalizedText}
        </Text>
      )}
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    width: '100%',
    overflow: 'hidden',
  },
  track: {
    flexDirection: 'row',
    alignItems: 'center',
  },
  measureText: {
    position: 'absolute',
    opacity: 0,
    left: 0,
    top: -9999,
  },
});