import React from 'react';
import { View, FlatList, ActivityIndicator, RefreshControl, StyleSheet, Image } from 'react-native';
import { VideoPlayer } from '@/components/video/video-player';
import { ThemedText } from '@/components/themed-text';
import MaterialIcons from '@expo/vector-icons/MaterialIcons';
import { useColorScheme } from '@/hooks/use-color-scheme';
import type { TemplateGeneration } from '@/lib/api/template-generations';

export function ContentGallery({
  generations,
  isRefreshing,
  onRefresh,
  isLoadingMore,
  hasMore,
  onLoadMore,
}: {
  generations: TemplateGeneration[];
  isRefreshing: boolean;
  onRefresh: () => void;
  isLoadingMore: boolean;
  hasMore: boolean;
  onLoadMore: () => void;
}) {
  const colorScheme = useColorScheme();
  const palette = colorScheme === 'dark' ? darkPalette : lightPalette;

  const renderItem = ({ item }: { item: TemplateGeneration }) => (
    <ContentItem palette={palette} generation={item} />
  );

  const renderFooter = () => {
    if (isLoadingMore) {
      return (
        <View style={[styles.loadingMoreContainer, { backgroundColor: palette.background }]}>
          <ActivityIndicator size="small" color={palette.accent} />
        </View>
      );
    }
    return null;
  };

  return (
    <FlatList
      data={generations}
      renderItem={renderItem}
      ListFooterComponent={renderFooter}
      numColumns={2}
      keyExtractor={(item) => item.id}
      columnWrapperStyle={styles.columnWrapper}
      showsVerticalScrollIndicator={false}
      refreshControl={
        <RefreshControl
          refreshing={isRefreshing}
          onRefresh={onRefresh}
          tintColor={palette.accent}
          colors={[palette.accent]}
        />
      }
      onEndReached={onLoadMore}
      onEndReachedThreshold={0.5}
    />
  );
}

function ContentItem({
  palette,
  generation,
}: {
  palette: any;
  generation: TemplateGeneration;
}) {
  const formatDate = (dateString: string) => {
    const date = new Date(dateString);
    return date.toLocaleDateString('en-US', {
      month: 'short',
      day: 'numeric',
    });
  };

  const renderMedia = () => {
    const mediaUrl = generation.resultUrl[0];
    if (generation.type === 'IMAGE') {
      return (
        <View style={styles.mediaContainer}>
          <Image
            source={{ uri: mediaUrl }}
            style={styles.mediaImage}
            resizeMode="cover"
          />
        </View>
      );
    } else if (generation.type === 'VIDEO') {
      return (
        <View style={styles.mediaContainer}>
          <VideoPlayer
            source={{ uri: mediaUrl }}
            style={styles.mediaVideo}
            shouldPlay={false}
            isLooping={true}
            isMuted={true}
            useNativeControls={false}
            showPoster={true}
            maxHeight={300}
          />
        </View>
      );
    }
    return null;
  };

  return (
    <View
      style={[
        styles.contentItem,
        {
          backgroundColor: palette.surface,
          borderColor: palette.border,
        },
      ]}
    >
      {renderMedia()}
      <View style={styles.contentInfo}>
        <ThemedText
          style={[styles.contentTitle, { color: palette.textPrimary }]}
          numberOfLines={1}
        >
          {generation.template.title}
        </ThemedText>
        <View style={styles.contentMeta}>
          <View style={styles.metaItem}>
            <MaterialIcons name="schedule" size={14} color={palette.textSecondary} />
            <ThemedText style={[styles.metaText, { color: palette.textSecondary }]}>
              {formatDate(generation.createdAt)}
            </ThemedText>
          </View>
          {generation.status !== 'completed' && (
            <View style={styles.statusBadge}>
              <ThemedText style={[styles.statusText, { color: palette.textSecondary }]}>
                {generation.status}
              </ThemedText>
            </View>
          )}
        </View>
      </View>
    </View>
  );
}

const darkPalette = {
  background: '#050505',
  surface: '#121216',
  border: '#1D1E24',
  textPrimary: '#F6F7FA',
  textSecondary: '#8E9098',
  accent: '#B7FF2F',
};

const lightPalette = {
  background: '#F7F8FB',
  surface: '#FFFFFF',
  border: '#E2E5ED',
  textPrimary: '#0F1320',
  textSecondary: '#5E6474',
  accent: '#405CFF',
};

const styles = StyleSheet.create({
  columnWrapper: {
    justifyContent: 'space-between',
  },
  contentItem: {
    flex: 1,
    borderRadius: 16,
    borderWidth: 1,
    marginBottom: 12,
    overflow: 'hidden',
    marginHorizontal: 6,
  },
  mediaContainer: {
    width: '100%',
    aspectRatio: 1,
    backgroundColor: '#000',
  },
  mediaImage: {
    width: '100%',
    height: '100%',
  },
  mediaVideo: {
    width: '100%',
    height: '100%',
  },
  contentInfo: {
    padding: 12,
  },
  contentTitle: {
    fontSize: 15,
    fontWeight: '600',
    marginBottom: 8,
  },
  contentMeta: {
    flexDirection: 'row',
    alignItems: 'center',
  },
  metaItem: {
    flexDirection: 'row',
    alignItems: 'center',
    marginRight: 12,
  },
  metaText: {
    fontSize: 12,
    marginLeft: 4,
  },
  statusBadge: {
    paddingHorizontal: 8,
    paddingVertical: 4,
    borderRadius: 4,
    backgroundColor: 'rgba(0, 0, 0, 0.1)',
  },
  statusText: {
    fontSize: 11,
    fontWeight: '600',
    textTransform: 'capitalize' as const,
  },
  loadingMoreContainer: {
    paddingVertical: 20,
    alignItems: 'center',
  },
});