src/components/AnswerButton.tsx

import React from 'react';
import { StyleSheet, Text, Pressable } from 'react-native';
import Animated, {
  useSharedValue,
  useAnimatedStyle,
  withSpring,
  withSequence,
  withTiming,
} from 'react-native-reanimated';
import { COLORS } from '../constants/colors';

interface AnswerButtonProps {
  answer: number;
  index: number;
  onPress: (answer: number) => void;
  disabled: boolean;
  isCorrect?: boolean | null;
}

export const AnswerButton: React.FC<AnswerButtonProps> = ({
  answer,
  index,
  onPress,
  disabled,
  isCorrect,
}) => {
  const scale = useSharedValue(1);
  const shake = useSharedValue(0);

  const handlePress = () => {
    if (disabled) return;
    scale.value = withSpring(0.94, { damping: 12, stiffness: 300 }, () => {
      scale.value = withSpring(1, { damping: 10, stiffness: 200 });
    });
    onPress(answer);
  };

  React.useEffect(() => {
    if (isCorrect === false) {
      shake.value = withSequence(
        withTiming(-6, { duration: 40 }),
        withTiming(6, { duration: 40 }),
        withTiming(-6, { duration: 40 }),
        withTiming(6, { duration: 40 }),
        withTiming(0, { duration: 40 })
      );
    } else if (isCorrect === true) {
      scale.value = withSequence(
        withSpring(1.08, { damping: 6, stiffness: 200 }),
        withSpring(1, { damping: 10, stiffness: 200 })
      );
    }
  }, [isCorrect]);

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

  const bgColor =
    isCorrect === true
      ? COLORS.success
      : isCorrect === false
      ? COLORS.error
      : COLORS.surfaceLight;

  const borderColor =
    isCorrect === true
      ? COLORS.success
      : isCorrect === false
      ? COLORS.error
      : COLORS.borderLight;

  const textColor =
    isCorrect === true
      ? COLORS.success
      : isCorrect === false
      ? COLORS.error
      : COLORS.text;

  return (
    <Animated.View style={[styles.container, animStyle]}>
      <Pressable
        onPress={handlePress}
        disabled={disabled}
        style={[
          styles.button,
          {
            backgroundColor: isCorrect !== null ? bgColor + '18' : COLORS.surface,
            borderColor: borderColor,
          },
        ]}
      >
        <Text style={[styles.text, { color: textColor }]}>{answer}</Text>
      </Pressable>
    </Animated.View>
  );
};

const styles = StyleSheet.create({
  container: {
    width: '48%',
    marginVertical: 5,
  },
  button: {
    borderRadius: 12,
    borderWidth: 1.5,
    paddingVertical: 18,
    alignItems: 'center',
    justifyContent: 'center',
  },
  text: {
    fontSize: 26,
    fontWeight: '800',
    fontVariant: ['tabular-nums'],
  },
});