import { useState } from 'react';
import { Ionicons } from '@expo/vector-icons';
import { useRouter } from 'expo-router';
import {
  ActivityIndicator,
  KeyboardAvoidingView,
  Platform,
  Pressable,
  ScrollView,
  StyleSheet,
  Text,
  TextInput,
  View,
} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import { useKeywordBlock } from '../../../src/hooks';
import { colors } from '../../../src/theme';

/* ===================== 子组件：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}>关键词屏蔽</Text>
      <View style={styles.headerBtn} />
    </View>
  );
}

/* ===================== 子组件：关键词标签 ===================== */

function KeywordChip({
  text,
  onRemove,
}: {
  text: string;
  onRemove: () => void;
}) {
  return (
    <View style={styles.chip}>
      <Text style={styles.chipText}>{text}</Text>
      <Pressable hitSlop={6} onPress={onRemove}>
        <Ionicons name="close-circle" size={16} color={colors.textHint} />
      </Pressable>
    </View>
  );
}

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

export default function KeywordBlockScreen() {
  const router = useRouter();
  const { setting, loading, error, refresh, addKeyword, removeKeyword } = useKeywordBlock();
  const [text, setText] = useState('');

  const handleAdd = async () => {
    const value = text.trim();
    if (!value) return;
    await addKeyword(value);
    setText('');
  };

  if (loading) {
    return (
      <SafeAreaView style={styles.safeArea} edges={['top']}>
        <Header onBack={() => router.back()} />
        <View style={styles.stateBox}>
          <ActivityIndicator size="large" color={colors.primary} />
        </View>
      </SafeAreaView>
    );
  }

  if (error || !setting) {
    return (
      <SafeAreaView style={styles.safeArea} edges={['top']}>
        <Header onBack={() => router.back()} />
        <View style={styles.stateBox}>
          <Ionicons name="alert-circle-outline" size={40} color={colors.danger} />
          <Text style={styles.stateText}>加载失败，请重试</Text>
          <Pressable style={styles.retryBtn} onPress={refresh}>
            <Text style={styles.retryText}>重试</Text>
          </Pressable>
        </View>
      </SafeAreaView>
    );
  }

  return (
    <SafeAreaView style={styles.safeArea} edges={['top', 'bottom']}>
      <Header onBack={() => router.back()} />
      <KeyboardAvoidingView
        style={styles.flex}
        behavior={Platform.OS === 'ios' ? 'padding' : undefined}
      >
        <ScrollView
          style={styles.scroll}
          contentContainerStyle={styles.content}
          showsVerticalScrollIndicator={false}
        >
          <View style={[styles.statCard, { backgroundColor: colors.dangerLight }]}>
            <Text style={[styles.statValue, { color: colors.dangerText }]}>{setting.blockedCount}</Text>
            <Text style={styles.statLabel}>累计拦截的招聘信息条数</Text>
          </View>

          <View style={styles.card}>
            <Text style={styles.cardTitle}>已屏蔽关键词</Text>
            {setting.keywords.length === 0 ? (
              <Text style={styles.emptyText}>暂无屏蔽词，添加后相关岗位与消息将被过滤</Text>
            ) : (
              <View style={styles.chipWrap}>
                {setting.keywords.map((word) => (
                  <KeywordChip
                    key={word}
                    text={word}
                    onRemove={() => removeKeyword(word)}
                  />
                ))}
              </View>
            )}
          </View>

          {setting.suggestions.length > 0 ? (
            <View style={styles.card}>
              <Text style={styles.cardTitle}>系统建议屏蔽</Text>
              <Text style={styles.cardHint}>点击即可快速添加高频骚扰词</Text>
              <View style={styles.chipWrap}>
                {setting.suggestions.map((word) => (
                  <Pressable
                    key={word}
                    style={styles.suggestChip}
                    onPress={() => addKeyword(word)}
                  >
                    <Ionicons name="add" size={14} color={colors.primary} />
                    <Text style={styles.suggestText}>{word}</Text>
                  </Pressable>
                ))}
              </View>
            </View>
          ) : null}

          <View style={styles.noteCard}>
            <Ionicons name="information-circle-outline" size={18} color={colors.info} />
            <Text style={styles.noteText}>
              屏蔽关键词后，标题或详情包含该词的职位推荐与沟通消息将被隐藏，不影响你已投递的岗位。
            </Text>
          </View>
        </ScrollView>

        <View style={styles.inputBar}>
          <TextInput
            style={styles.input}
            value={text}
            onChangeText={setText}
            placeholder="输入要屏蔽的关键词"
            placeholderTextColor={colors.textHint}
            returnKeyType="done"
            onSubmitEditing={handleAdd}
          />
          <Pressable
            style={[styles.addBtn, !text.trim() && styles.addBtnDisabled]}
            disabled={!text.trim()}
            onPress={handleAdd}
          >
            <Text style={styles.addBtnText}>添加</Text>
          </Pressable>
        </View>
      </KeyboardAvoidingView>
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  safeArea: {
    flex: 1,
    backgroundColor: colors.pageBg,
  },
  flex: {
    flex: 1,
  },
  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: {
    flex: 1,
    textAlign: 'center',
    fontSize: 17,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  scroll: {
    flex: 1,
  },
  content: {
    padding: 8,
    paddingBottom: 16,
  },
  stateBox: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    gap: 12,
  },
  stateText: {
    marginTop: 12,
    fontSize: 14,
    color: colors.textSecondary,
  },
  retryBtn: {
    marginTop: 16,
    paddingHorizontal: 24,
    paddingVertical: 8,
    borderRadius: 18,
    backgroundColor: colors.primaryBtn,
  },
  retryText: {
    fontSize: 13,
    fontWeight: '600',
    color: colors.white,
  },
  statCard: {
    borderRadius: 8,
    padding: 8,
    alignItems: 'center',
    marginBottom: 8,
  },
  statValue: {
    fontSize: 32,
    fontWeight: '800',
  },
  statLabel: {
    marginTop: 4,
    fontSize: 13,
    color: colors.textSecondary,
  },
  card: {
    backgroundColor: colors.white,
    borderRadius: 8,
    padding: 8,
    marginBottom: 8,
  },
  cardTitle: {
    fontSize: 15,
    fontWeight: '700',
    color: colors.textPrimary,
    marginBottom: 4,
  },
  cardHint: {
    fontSize: 12,
    color: colors.textSecondary,
    marginBottom: 12,
  },
  emptyText: {
    fontSize: 13,
    lineHeight: 19,
    color: colors.textSecondary,
  },
  chipWrap: {
    flexDirection: 'row',
    flexWrap: 'wrap',
    gap: 8,
    marginTop: 12,
  },
  chip: {
    flexDirection: 'row',
    alignItems: 'center',
    backgroundColor: colors.dangerLight,
    borderRadius: 16,
    paddingVertical: 6,
    paddingHorizontal: 10,
    gap: 4,
  },
  chipText: {
    fontSize: 13,
    fontWeight: '600',
    color: colors.dangerText,
  },
  suggestChip: {
    flexDirection: 'row',
    alignItems: 'center',
    backgroundColor: colors.primaryLight,
    borderRadius: 16,
    paddingVertical: 6,
    paddingHorizontal: 10,
    gap: 2,
  },
  suggestText: {
    fontSize: 13,
    fontWeight: '600',
    color: colors.primary,
  },
  noteCard: {
    flexDirection: 'row',
    alignItems: 'flex-start',
    backgroundColor: colors.white,
    borderRadius: 8,
    padding: 8,
    gap: 8,
  },
  noteText: {
    flex: 1,
    fontSize: 12,
    lineHeight: 18,
    color: colors.textSecondary,
  },
  inputBar: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 8,
    paddingHorizontal: 12,
    paddingVertical: 10,
    backgroundColor: colors.white,
    borderTopWidth: 1,
    borderTopColor: colors.borderLight,
  },
  input: {
    flex: 1,
    height: 40,
    borderRadius: 20,
    backgroundColor: colors.pageBg,
    paddingHorizontal: 16,
    fontSize: 14,
    color: colors.textPrimary,
  },
  addBtn: {
    height: 40,
    paddingHorizontal: 20,
    borderRadius: 20,
    backgroundColor: colors.primaryBtn,
    alignItems: 'center',
    justifyContent: 'center',
  },
  addBtnDisabled: {
    backgroundColor: colors.border,
  },
  addBtnText: {
    fontSize: 14,
    fontWeight: '700',
    color: colors.white,
  },
});