import React, { useEffect, useRef } from 'react';
import { View, Animated, StyleSheet } from 'react-native';
import { useTheme } from '~/features/theme/ThemeProvider';
import MemoPreviewSkeleton from '~/components/molecules/MemoPreviewSkeleton';
import MemoroLogo from '~/components/atoms/MemoroLogo';

interface HomePageSkeletonProps {
  recordingButtonSize: number;
  showBlueprints?: boolean;
  showLanguageButton?: boolean;
}

/**
 * Vollständiger Skeleton Loader für die Homepage
 * Zeigt Platzhalter für alle Elemente während des initialen Ladens
 */
export default function HomePageSkeleton({
  recordingButtonSize,
  showBlueprints = true,
  showLanguageButton = true
}: HomePageSkeletonProps) {
  const { colors, isDark } = useTheme();
  const pulseAnim = useRef(new Animated.Value(0.4)).current;

  const skeletonColor = colors.skeleton;
  const backgroundColor = colors.contentBackground;

  // Pulsing animation
  useEffect(() => {
    const pulse = Animated.loop(
      Animated.sequence([
        Animated.timing(pulseAnim, {
          toValue: 1,
          duration: 1000,
          useNativeDriver: true,
        }),
        Animated.timing(pulseAnim, {
          toValue: 0.4,
          duration: 1000,
          useNativeDriver: true,
        }),
      ])
    );

    pulse.start();

    return () => pulse.stop();
  }, [pulseAnim]);

  return (
    <View style={styles.container}>
      {/* MemoPreview Skeleton - oben */}
      <View style={styles.memoPreviewContainer}>
        <MemoPreviewSkeleton showMargins={false} />
      </View>

      {/* Recording Button Skeleton - zentriert */}
      <View style={[styles.recordingButtonContainer, {
        transform: [{ translateY: -(recordingButtonSize / 2 + 10) }]
      }]}>
        <Animated.View
          style={[
            styles.recordingButtonCircle,
            {
              width: recordingButtonSize,
              height: recordingButtonSize,
              borderRadius: recordingButtonSize / 2,
              backgroundColor: skeletonColor,
              opacity: pulseAnim,
              justifyContent: 'center',
              alignItems: 'center',
            },
          ]}
        >
          {/* Memoro Logo inside button - 42% of button size */}
          <MemoroLogo
            size={recordingButtonSize * 0.42}
            color={skeletonColor}
          />
        </Animated.View>

        {/* Language Button Skeleton - links neben Recording Button */}
        {showLanguageButton && (
          <View style={styles.languageButtonSkeleton}>
            <Animated.View
              style={[
                styles.languageCircle,
                {
                  backgroundColor: skeletonColor,
                  opacity: pulseAnim,
                },
              ]}
            />
          </View>
        )}
      </View>

      {/* Blueprint Pills Skeleton - unten */}
      {showBlueprints && (
        <View style={styles.blueprintSelectorContainer}>
          <View style={styles.pillsContainer}>
            {[80, 100, 90, 110, 95].map((width, index) => (
              <Animated.View
                key={index}
                style={[
                  styles.pillSkeleton,
                  {
                    width,
                    backgroundColor: skeletonColor,
                    opacity: pulseAnim,
                  },
                ]}
              />
            ))}
          </View>
        </View>
      )}
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    position: 'relative',
  },
  memoPreviewContainer: {
    position: 'absolute',
    top: 0,
    left: 0,
    right: 0,
    zIndex: 20,
    minHeight: 180,
  },
  recordingButtonContainer: {
    position: 'absolute',
    top: '50%',
    left: 0,
    right: 0,
    alignItems: 'center',
    justifyContent: 'center',
    zIndex: 30,
  },
  recordingButtonCircle: {
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 4 },
    shadowOpacity: 0.2,
    shadowRadius: 8,
    elevation: 5,
  },
  languageButtonSkeleton: {
    position: 'absolute',
    left: -64,
    top: '50%',
    transform: [{ translateY: -26 }],
  },
  languageCircle: {
    width: 52,
    height: 52,
    borderRadius: 26,
  },
  blueprintSelectorContainer: {
    position: 'absolute',
    bottom: 0,
    left: 0,
    right: 0,
    zIndex: 10,
    paddingVertical: 16,
    paddingHorizontal: 16,
    minHeight: 60,
  },
  pillsContainer: {
    flexDirection: 'row',
    gap: 8,
    flexWrap: 'nowrap',
    paddingHorizontal: 8,
  },
  pillSkeleton: {
    height: 36,
    borderRadius: 18,
  },
});