import React, { useEffect, useRef } from 'react'
import {
  View, Text, StyleSheet, Animated, Easing, Dimensions,
} from 'react-native'

const { height: SCREEN_H } = Dimensions.get('window')

const ACCENT = '#60a5fa'
const ACCENT_DIM = 'rgba(59,130,246,0.12)'
const ACCENT_BORDER = 'rgba(59,130,246,0.38)'

export default function SplashScreen({ onDone }) {
  const scanAnim = useRef(new Animated.Value(0)).current
  const progAnim = useRef(new Animated.Value(0)).current
  const fadeAnim = useRef(new Animated.Value(1)).current

  useEffect(() => {
    Animated.loop(
      Animated.timing(scanAnim, {
        toValue: 1,
        duration: 3200,
        easing: Easing.linear,
        useNativeDriver: true,
      })
    ).start()

    Animated.timing(progAnim, {
      toValue: 1,
      duration: 2600,
      easing: Easing.out(Easing.quad),
      useNativeDriver: false,
    }).start()

    const t = setTimeout(() => {
      Animated.timing(fadeAnim, {
        toValue: 0,
        duration: 280,
        useNativeDriver: true,
      }).start(() => onDone && onDone())
    }, 2900)

    return () => clearTimeout(t)
  }, [])

  const scanTranslate = scanAnim.interpolate({
    inputRange: [0, 1],
    outputRange: [-2, SCREEN_H + 2],
  })

  const progWidth = progAnim.interpolate({
    inputRange: [0, 1],
    outputRange: ['0%', '100%'],
  })

  return (
    <Animated.View style={[styles.root, { opacity: fadeAnim }]}>
      {/* Orb glow */}
      <View style={styles.orbTop} />
      <View style={styles.orbBottom} />

      {/* Scan line */}
      <Animated.View
        style={[styles.scanLine, { transform: [{ translateY: scanTranslate }] }]}
      />

      {/* Content */}
      <View style={styles.content}>
        {/* Badge pill */}
        <View style={styles.pill}>
          <Text style={styles.pillText}>✎  LOCAL FILES · SYNTAX HIGHLIGHT</Text>
        </View>

        {/* Title */}
        <Text style={styles.title}>Code{'\n'}Editor</Text>

        {/* Subtitle */}
        <Text style={styles.subtitle}>
          Edit your local files with full syntax highlighting.
        </Text>

        {/* Progress bar */}
        <View style={styles.progWrap}>
          <Animated.View style={[styles.progBar, { width: progWidth }]} />
        </View>
      </View>

      {/* Version */}
      <Text style={styles.version}>v1.0.0</Text>
    </Animated.View>
  )
}

const styles = StyleSheet.create({
  root: {
    flex: 1,
    backgroundColor: '#08090f',
    alignItems: 'center',
    justifyContent: 'center',
  },
  orbTop: {
    position: 'absolute',
    top: -80,
    left: -60,
    width: 380,
    height: 380,
    borderRadius: 190,
    backgroundColor: 'rgba(37,99,235,0.13)',
  },
  orbBottom: {
    position: 'absolute',
    bottom: -120,
    right: -80,
    width: 300,
    height: 300,
    borderRadius: 150,
    backgroundColor: 'rgba(59,130,246,0.07)',
  },
  scanLine: {
    position: 'absolute',
    left: 0,
    right: 0,
    top: 0,
    height: 2,
    backgroundColor: ACCENT,
    opacity: 0.55,
  },
  content: {
    alignItems: 'center',
    paddingHorizontal: 32,
    zIndex: 10,
  },
  pill: {
    flexDirection: 'row',
    alignItems: 'center',
    paddingVertical: 5,
    paddingHorizontal: 14,
    borderRadius: 20,
    borderWidth: 1,
    borderColor: ACCENT_BORDER,
    backgroundColor: ACCENT_DIM,
    marginBottom: 20,
  },
  pillText: {
    color: '#93c5fd',
    fontSize: 10,
    fontWeight: '700',
    letterSpacing: 1.1,
    textTransform: 'uppercase',
  },
  title: {
    fontSize: 72,
    fontWeight: '900',
    color: '#bfdbfe',
    textAlign: 'center',
    lineHeight: 72,
    letterSpacing: -2,
    marginBottom: 12,
  },
  subtitle: {
    fontSize: 13,
    color: '#4a5068',
    textAlign: 'center',
    letterSpacing: 0.3,
    marginBottom: 32,
    lineHeight: 19,
  },
  progWrap: {
    width: 180,
    height: 2,
    backgroundColor: 'rgba(255,255,255,0.06)',
    borderRadius: 1,
    overflow: 'hidden',
  },
  progBar: {
    height: '100%',
    backgroundColor: ACCENT,
    borderRadius: 1,
  },
  version: {
    position: 'absolute',
    bottom: 20,
    right: 20,
    fontSize: 10,
    color: '#252830',
  },
})