import { useState, useEffect, useRef } from 'react';
import {
  View,
  ScrollView,
  Pressable,
  PlatformColor,
} from 'react-native';
import { Ionicons } from '@expo/vector-icons';
import { LiquidGlassView } from '@callstack/liquid-glass';
import { useSafeAreaInsets } from 'react-native-safe-area-context';
import Animated, {
  useSharedValue,
  useAnimatedStyle,
  withTiming,
  interpolate,
} from 'react-native-reanimated';
import { useTheme } from '~/contexts/ThemeContext';
import { Text } from './Text';
import { Tag } from '~/store/tagStore';

type SortMode = 'recent' | 'popular' | 'trending';

type ExploreSortBarProps = {
  isMinimized?: boolean;
  scrollY?: number;
  sortMode: SortMode;
  onSortModeChange: (mode: SortMode) => void;
  tags: Tag[];
  selectedTags: string[];
  onToggleTag: (tagId: string) => void;
  onClearFilters: () => void;
  generateBarExpanded?: boolean;
};

export function ExploreSortBar({
  isMinimized: externalIsMinimized = false,
  scrollY = 0,
  sortMode,
  onSortModeChange,
  tags,
  selectedTags,
  onToggleTag,
  onClearFilters,
  generateBarExpanded = false,
}: ExploreSortBarProps) {
  const insets = useSafeAreaInsets();
  const { theme } = useTheme();
  const [manuallyExpanded, setManuallyExpanded] = useState(false);
  const lastScrollY = useRef(0);

  // Track scroll changes and close if scrolling while manually opened
  useEffect(() => {
    const scrollDiff = Math.abs(scrollY - lastScrollY.current);

    // If user scrolls more than 20px, close the bar
    if (scrollDiff > 20 && manuallyExpanded) {
      setManuallyExpanded(false);
    }

    lastScrollY.current = scrollY;
  }, [scrollY]);

  // Determine if bar should be minimized - always stay minimized unless manually expanded
  const isMinimized = !manuallyExpanded;

  // Animation value: 0 = FAB, 1 = full bar
  const animationProgress = useSharedValue(0);

  // Shared value for generate bar expanded state - starts at 0
  const generateBarExpandedShared = useSharedValue(0);

  // Animate when minimized state changes
  useEffect(() => {
    animationProgress.value = withTiming(isMinimized ? 0 : 1, {
      duration: 300,
    });
  }, [isMinimized]);

  // Update shared value when generateBarExpanded changes
  useEffect(() => {
    generateBarExpandedShared.value = withTiming(generateBarExpanded ? 1 : 0, {
      duration: 300,
    });
  }, [generateBarExpanded]);

  const hasActiveFilters = selectedTags.length > 0;

  return (
    <Animated.View
      style={[
        {
          position: 'absolute',
          left: 24,
          right: 24,
          zIndex: 2,
        },
        useAnimatedStyle(() => {
          const baseBottom = interpolate(
            animationProgress.value,
            [0, 1],
            [insets.bottom + 122, insets.bottom + 129] // Lower when minimized (FAB), higher when expanded (bar)
          );

          // Move up 4px when generate bar is expanded
          const offset = generateBarExpandedShared.value * 4;

          return {
            bottom: baseBottom + offset,
          };
        }),
      ]}
    >
      <Pressable
        onPress={() => {
          if (isMinimized) {
            setManuallyExpanded(true);
          }
        }}
        disabled={!isMinimized}
      >
        <Animated.View
          style={[
            {
              overflow: 'hidden',
            },
            useAnimatedStyle(() => {
              // FAB size: 52x52
              const width = interpolate(
                animationProgress.value,
                [0, 1],
                [52, 400] // FAB width to full bar width
              );
              const height = interpolate(
                animationProgress.value,
                [0, 1],
                [52, 60] // FAB height to bar height
              );
              const borderRadius = interpolate(
                animationProgress.value,
                [0, 1],
                [26, 999] // FAB round to bar round
              );

              return {
                width: animationProgress.value === 1 ? '100%' : width,
                height,
                borderRadius,
                ...theme.shadows.lg,
              };
            }),
          ]}
        >
          {/* FAB Icon - only visible when minimized */}
          <Animated.View
            style={[
              {
                position: 'absolute',
                top: 0,
                left: 0,
                right: 0,
                bottom: 0,
                borderRadius: 26,
                overflow: 'hidden',
              },
              useAnimatedStyle(() => ({
                opacity: interpolate(animationProgress.value, [0, 0.3], [1, 0]),
                transform: [
                  {
                    scale: interpolate(animationProgress.value, [0, 0.3], [1, 0.8]),
                  },
                ],
              })),
            ]}
            pointerEvents={isMinimized ? 'auto' : 'none'}
          >
            <LiquidGlassView
              effect="regular"
              interactive={true}
              colorScheme="system"
              style={{
                flex: 1,
                justifyContent: 'center',
                alignItems: 'center',
                borderRadius: 26,
                overflow: 'hidden',
              }}
            >
              <View>
                <Ionicons name="funnel" size={20} color={PlatformColor('labelColor')} />
                {hasActiveFilters && (
                  <View
                    style={{
                      position: 'absolute',
                      top: -4,
                      right: -4,
                      width: 12,
                      height: 12,
                      borderRadius: 6,
                      backgroundColor: theme.colors.primary.default,
                    }}
                  />
                )}
              </View>
            </LiquidGlassView>
          </Animated.View>

          {/* Full Bar Content - only visible when not minimized */}
          <Animated.View
            style={[
              {
                width: '100%',
              },
              useAnimatedStyle(() => ({
                opacity: interpolate(animationProgress.value, [0.7, 1], [0, 1]),
              })),
            ]}
            pointerEvents={isMinimized ? 'none' : 'auto'}
          >
            <LiquidGlassView
              effect="regular"
              interactive={true}
              colorScheme="system"
              style={{ borderRadius: 999, overflow: 'hidden', width: '100%' }}
            >
              <View style={{ flexDirection: 'row', alignItems: 'center', paddingVertical: 8, paddingHorizontal: 12 }}>
                {/* All Pills - Horizontal Scrollable */}
                <ScrollView
                  horizontal
                  showsHorizontalScrollIndicator={false}
                  contentContainerStyle={{ paddingRight: 8 }}
                  style={{ flex: 1 }}
                >
                  {/* Sort Mode Pills */}
                  <Pressable
                    onPress={() => onSortModeChange('recent')}
                    style={{
                      flexDirection: 'row',
                      alignItems: 'center',
                      paddingHorizontal: 16,
                      paddingVertical: 8,
                      borderRadius: 999,
                      borderWidth: 2,
                      borderColor: sortMode === 'recent' ? theme.colors.primary.default : PlatformColor('separatorColor'),
                      backgroundColor: sortMode === 'recent' ? theme.colors.primary.default : 'transparent',
                      marginRight: 8,
                    }}
                  >
                    <Ionicons
                      name="time-outline"
                      size={16}
                      color={sortMode === 'recent' ? 'white' : PlatformColor('labelColor')}
                      style={{ marginRight: 6 }}
                    />
                    <Text style={{ color: sortMode === 'recent' ? 'white' : PlatformColor('labelColor'), fontSize: 14, fontWeight: '600' }}>
                      Neueste
                    </Text>
                  </Pressable>

                  <Pressable
                    onPress={() => onSortModeChange('popular')}
                    style={{
                      flexDirection: 'row',
                      alignItems: 'center',
                      paddingHorizontal: 16,
                      paddingVertical: 8,
                      borderRadius: 999,
                      borderWidth: 2,
                      borderColor: sortMode === 'popular' ? theme.colors.primary.default : PlatformColor('separatorColor'),
                      backgroundColor: sortMode === 'popular' ? theme.colors.primary.default : 'transparent',
                      marginRight: 8,
                    }}
                  >
                    <Ionicons
                      name="heart-outline"
                      size={16}
                      color={sortMode === 'popular' ? 'white' : PlatformColor('labelColor')}
                      style={{ marginRight: 6 }}
                    />
                    <Text style={{ color: sortMode === 'popular' ? 'white' : PlatformColor('labelColor'), fontSize: 14, fontWeight: '600' }}>
                      Beliebt
                    </Text>
                  </Pressable>

                  <Pressable
                    onPress={() => onSortModeChange('trending')}
                    style={{
                      flexDirection: 'row',
                      alignItems: 'center',
                      paddingHorizontal: 16,
                      paddingVertical: 8,
                      borderRadius: 999,
                      borderWidth: 2,
                      borderColor: sortMode === 'trending' ? theme.colors.primary.default : PlatformColor('separatorColor'),
                      backgroundColor: sortMode === 'trending' ? theme.colors.primary.default : 'transparent',
                      marginRight: 8,
                    }}
                  >
                    <Text style={{ color: sortMode === 'trending' ? 'white' : PlatformColor('labelColor'), fontSize: 14, fontWeight: '600' }}>
                      🔥 Trending
                    </Text>
                  </Pressable>

                  {/* Tags Pills */}
                  {tags.map((tag) => {
                    const isSelected = selectedTags.includes(tag.id);
                    return (
                      <Pressable
                        key={tag.id}
                        onPress={() => onToggleTag(tag.id)}
                        style={{
                          flexDirection: 'row',
                          alignItems: 'center',
                          paddingHorizontal: 16,
                          paddingVertical: 8,
                          borderRadius: 999,
                          borderWidth: 2,
                          borderColor: isSelected ? theme.colors.primary.default : PlatformColor('separatorColor'),
                          backgroundColor: isSelected ? theme.colors.primary.default : 'transparent',
                          marginRight: 8,
                        }}
                      >
                        <Text style={{ color: isSelected ? 'white' : PlatformColor('labelColor'), fontSize: 14, fontWeight: '600' }}>
                          {tag.name}
                        </Text>
                      </Pressable>
                    );
                  })}
                </ScrollView>

                {/* Clear Filters Button */}
                {hasActiveFilters && (
                  <Pressable
                    onPress={onClearFilters}
                    style={{
                      paddingHorizontal: 8,
                      paddingVertical: 8,
                    }}
                  >
                    <Ionicons name="close-circle" size={24} color={PlatformColor('labelColor')} />
                  </Pressable>
                )}
              </View>
            </LiquidGlassView>
          </Animated.View>
        </Animated.View>
      </Pressable>
    </Animated.View>
  );
}