import { Ionicons } from '@expo/vector-icons';
import { useLocalSearchParams, useRouter } from 'expo-router';
import { Pressable, ScrollView, StyleSheet, Text, View } from 'react-native';
import type { ComponentProps } from 'react';
import { SafeAreaView } from 'react-native-safe-area-context';
import { useGrowthData } from '../../src/hooks';
import { LoadingState, ErrorState, EmptyState } from '../../src/components/StateView';
import { articleThumbnailColors, colors } from '../../src/theme';
import { formatViews } from '../../src/utils';

type IconName = ComponentProps<typeof Ionicons>['name'];

/* ===================== 顶部导航 ===================== */

function Header({ onBack }: { onBack: () => void }) {
  return (
    <View style={styles.header}>
      <Pressable style={styles.headerBtn} onPress={onBack} hitSlop={8}>
        <Ionicons name="chevron-back" size={24} color={colors.textPrimary} />
      </Pressable>
      <Text style={styles.headerTitle}>职场干货</Text>
      <View style={styles.headerBtn} />
    </View>
  );
}

/* ===================== 页面 ===================== */

export default function ArticleScreen() {
  const router = useRouter();
  const { id } = useLocalSearchParams<{ id: string }>();
  const { articles, loading, error, refresh } = useGrowthData();

  const article = articles.find((a) => a.id === id);

  return (
    <SafeAreaView style={styles.safeArea} edges={['top']}>
      <Header onBack={() => router.back()} />
      {loading ? (
        <LoadingState text="加载文章中…" />
      ) : error ? (
        <ErrorState onRetry={refresh} />
      ) : !article ? (
        <EmptyState icon="document-text-outline" title="文章不存在" subtitle="该内容可能已下架" />
      ) : (
        <ScrollView
          style={styles.scroll}
          contentContainerStyle={styles.content}
          showsVerticalScrollIndicator={false}
        >
          <View
            style={[
              styles.thumb,
              { backgroundColor: articleThumbnailColors[article.thumbnailColor].bg },
            ]}
          >
            <Ionicons
              name={article.icon as IconName}
              size={40}
              color={articleThumbnailColors[article.thumbnailColor].color}
            />
          </View>
          <Text style={styles.title}>{article.title}</Text>
          <View style={styles.meta}>
            <Text style={styles.tag}>{article.tag}</Text>
            <Text style={styles.views}>{formatViews(article.views)}阅读</Text>
          </View>
          <Text style={styles.body}>{article.content}</Text>
        </ScrollView>
      )}
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  safeArea: {
    flex: 1,
    backgroundColor: colors.pageBg,
  },
  header: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: 8,
    height: 48,
    backgroundColor: colors.white,
    borderBottomWidth: 1,
    borderBottomColor: colors.borderLight,
  },
  headerBtn: {
    width: 40,
    height: 40,
    alignItems: 'center',
    justifyContent: 'center',
  },
  headerTitle: {
    fontSize: 17,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  scroll: {
    flex: 1,
  },
  content: {
    padding: 16,
    paddingBottom: 24,
  },
  thumb: {
    width: 72,
    height: 72,
    borderRadius: 16,
    alignItems: 'center',
    justifyContent: 'center',
    marginBottom: 14,
  },
  title: {
    fontSize: 20,
    fontWeight: '700',
    color: colors.textPrimary,
    lineHeight: 28,
  },
  meta: {
    flexDirection: 'row',
    alignItems: 'center',
    marginTop: 10,
    marginBottom: 16,
  },
  tag: {
    fontSize: 11,
    color: colors.primaryText,
    backgroundColor: colors.primaryLight,
    paddingHorizontal: 8,
    paddingVertical: 2,
    borderRadius: 8,
    overflow: 'hidden',
    marginRight: 10,
  },
  views: {
    fontSize: 12,
    color: colors.textHint,
  },
  body: {
    fontSize: 14,
    lineHeight: 24,
    color: colors.textSecondary,
  },
});