import { HeaderBar } from '@/components/ui/HeaderBar';
import { Colors } from '@/constants/Colors';
import { useColorScheme } from '@/hooks/useColorScheme';
import { Article, getArticleById } from '@/services/articles';
import dayjs from 'dayjs';
import { useLocalSearchParams, useRouter } from 'expo-router';
import React, { useEffect, useState } from 'react';
import { ScrollView, StyleSheet, Text, View, useWindowDimensions } from 'react-native';
import RenderHTML from 'react-native-render-html';

export default function ArticleDetailScreen() {
  const { id } = useLocalSearchParams<{ id: string }>();
  const router = useRouter();
  const [article, setArticle] = useState<Article | undefined>(undefined);
  const { width } = useWindowDimensions();
  const colorScheme = (useColorScheme() ?? 'light') as 'light' | 'dark';
  const theme = Colors[colorScheme];

  useEffect(() => {
    if (id) {
      getArticleById(id).then((article) => {
        console.log('article', article);
        setArticle(article);
      });
    }
  }, [id]);

  if (!article) {
    return (
      <View style={{ flex: 1 }}>
        <HeaderBar title="文章" onBack={() => router.back()} showBottomBorder />
        <View style={{ padding: 24 }}>
        </View>
      </View>
    );
  }

  const source = { html: wrapHtml(article.htmlContent) };




  return (
    <View style={{ flex: 1, backgroundColor: theme.surface }}>
      <HeaderBar title="文章" onBack={() => router.back()} showBottomBorder />
      <ScrollView contentContainerStyle={styles.contentContainer} showsVerticalScrollIndicator={false}>
        <View style={styles.headerMeta}>
          <Text style={[styles.title, { color: theme.text }]}>{article.title}</Text>
          <View style={styles.row}>
            <Text style={[styles.metaText, { color: theme.textMuted }]}>{dayjs(article.publishedAt).format('YYYY-MM-DD')}</Text>
            <Text style={[styles.metaText, styles.dot]}>·</Text>
            <Text style={[styles.metaText, { color: theme.textMuted }]}>{article.readCount} 阅读</Text>
          </View>
        </View>
        <RenderHTML
          contentWidth={width - 48}
          source={source}
          baseStyle={{ ...htmlBaseStyles, color: theme.text }}
          tagsStyles={htmlTagStyles}
          enableExperimentalMarginCollapsing={true}
        />
        <View style={{ height: 36 }} />
      </ScrollView>
    </View>
  );
}

function wrapHtml(inner: string) {
  // 为了统一排版与图片自适应
  return `
    <div class="article">
      ${inner}
    </div>
    <style>
      .article img { max-width: 100%; height: auto; border-radius: 12px; }
    </style>
  `;
}

const styles = StyleSheet.create({
  contentContainer: {
    paddingHorizontal: 24,
    paddingTop: 12,
  },
  headerMeta: {
    marginBottom: 12,
  },
  title: {
    fontSize: 22,
    fontWeight: '800',
    color: '#192126',
  },
  row: {
    flexDirection: 'row',
    alignItems: 'center',
    marginTop: 8,
  },
  metaText: {
    fontSize: 12,
    color: '#8A8A8E',
  },
  dot: {
    paddingHorizontal: 6,
  },
});

const htmlBaseStyles = {
  color: '#192126',
  lineHeight: 24,
  fontSize: 16,
} as const;

const htmlTagStyles = {
  h1: { fontSize: 26, fontWeight: '800', marginBottom: 8 },
  h2: { fontSize: 22, fontWeight: '800', marginTop: 8, marginBottom: 8 },
  h3: { fontSize: 18, fontWeight: '700', marginTop: 12, marginBottom: 6 },
  p: { marginBottom: 12 },
  ol: { marginBottom: 12, paddingLeft: 18 },
  ul: { marginBottom: 12, paddingLeft: 18 },
  li: { marginBottom: 6 },
  img: { marginTop: 8, marginBottom: 8, borderRadius: 12 },
  em: { fontStyle: 'italic' },
  strong: { fontWeight: '800' },
} as const;