import { useThemeColor } from '@/hooks/use-theme-color';
import { Template } from '@/lib/types/template';
import { ActivityIndicator, FlatList, RefreshControl, StyleSheet, View } from 'react-native';
import { ThemedText } from '../themed-text';
import { ThemedView } from '../themed-view';
import { TemplateCard } from './template-card';

interface TemplateListProps {
  templates: Template[];
  loading?: boolean;
  refreshing?: boolean;
  isLoadingMore?: boolean;
  hasMore?: boolean;
  onRefresh?: () => void;
  onLoadMore?: () => void;
  onTemplatePress?: (template: Template) => void;
  onVideoChange?: (template: Template, index: number) => void;
  error?: string | null;
}

export function TemplateList({
  templates,
  loading = false,
  refreshing = false,
  isLoadingMore = false,
  hasMore = true,
  onRefresh,
  onLoadMore,
  onTemplatePress,
  onVideoChange,
  error,
}: TemplateListProps) {
  const tintColor = useThemeColor({}, 'tint');
  const errorColor = useThemeColor({}, 'error');

  // 渲染底部加载指示器
  const renderFooter = () => {
    if (isLoadingMore) {
      return (
        <View style={styles.footerLoader}>
          <ActivityIndicator size="small" color={tintColor} />
          <ThemedText style={styles.footerText}>加载中...</ThemedText>
        </View>
      );
    }

    if (!hasMore && templates.length > 0) {
      return (
        <View style={styles.noMoreContainer}>
          <ThemedText style={styles.noMoreText}>— 没有更多了 —</ThemedText>
        </View>
      );
    }

    return null;
  };

  if (loading && templates.length === 0) {
    return (
      <ThemedView style={styles.centerContainer}>
        <ActivityIndicator size="large" color={tintColor} />
        <ThemedText style={styles.loadingText}>加载中...</ThemedText>
      </ThemedView>
    );
  }

  if (error) {
    return (
      <ThemedView style={styles.centerContainer}>
        <ThemedText style={[styles.errorText, { color: errorColor }]}>
          ❌ {error}
        </ThemedText>
      </ThemedView>
    );
  }

  if (templates.length === 0) {
    return (
      <ThemedView style={styles.centerContainer}>
        <ThemedText style={styles.emptyText}>暂无模板</ThemedText>
        {!hasMore && (
          <View style={styles.noMoreContainer}>
            <ThemedText style={styles.noMoreText}>— 没有更多了 —</ThemedText>
          </View>
        )}
      </ThemedView>
    );
  }

  return (
    <FlatList
      data={templates}
      keyExtractor={(item) => item.id}
      renderItem={({ item, index }) => (
        <TemplateCard
          template={item}
          onPress={onTemplatePress}
          allTemplates={templates}
          currentIndex={index}
          onVideoChange={onVideoChange}
        />
      )}
      numColumns={2}
      columnWrapperStyle={styles.row}
      contentContainerStyle={styles.listContent}
      refreshControl={
        onRefresh ? (
          <RefreshControl
            refreshing={refreshing}
            onRefresh={onRefresh}
            colors={[tintColor]}
            tintColor={tintColor}
            progressViewOffset={70}
          />
        ) : undefined
      }
      onEndReached={onLoadMore}
      onEndReachedThreshold={0.2}
      ListFooterComponent={renderFooter}
      ListFooterComponentStyle={templates.length > 0 ? styles.footerContainer : null}
      showsVerticalScrollIndicator={false}
      removeClippedSubviews={true}
      maxToRenderPerBatch={10}
      initialNumToRender={6}
      windowSize={10}
    />
  );
}

const styles = StyleSheet.create({
  centerContainer: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    padding: 20,
  },
  listContent: {
    paddingHorizontal: 14,
    paddingTop: 70,
    paddingBottom: 80,
  },
  row: {
    justifyContent: 'space-between',
    paddingHorizontal: 2,
  },
  loadingText: {
    marginTop: 12,
    fontSize: 16,
    opacity: 0.7,
  },
  errorText: {
    fontSize: 16,
    textAlign: 'center',
  },
  emptyText: {
    fontSize: 16,
    opacity: 0.7,
  },
  footerLoader: {
    flexDirection: 'row',
    justifyContent: 'center',
    alignItems: 'center',
    paddingVertical: 20,
    gap: 8,
  },
  footerText: {
    fontSize: 14,
    opacity: 0.7,
  },
  footerContainer: {
    paddingBottom: 20,
  },
  noMoreContainer: {
    paddingVertical: 20,
    alignItems: 'center',
  },
  noMoreText: {
    fontSize: 14,
    opacity: 0.5,
    color: '#666',
  },
});