import { useState } from 'react';
import { Ionicons } from '@expo/vector-icons';
import { useRouter } from 'expo-router';
import {
  ActivityIndicator,
  Pressable,
  ScrollView,
  StyleSheet,
  Text,
  View,
} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import { useAccountCancel } 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}>账号注销</Text>
      <View style={styles.headerBtn} />
    </View>
  );
}

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

export default function AccountCancelScreen() {
  const router = useRouter();
  const { data, loading, error, refresh, submit } = useAccountCancel();
  const [reason, setReason] = useState('');
  const [submitting, setSubmitting] = useState(false);
  const [done, setDone] = useState<{ success: boolean; message: string } | null>(null);

  const handleSubmit = async () => {
    setSubmitting(true);
    try {
      const res = await submit(reason);
      setDone(res);
    } finally {
      setSubmitting(false);
    }
  };

  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 || !data) {
    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>
    );
  }

  if (done?.success) {
    return (
      <SafeAreaView style={styles.safeArea} edges={['top']}>
        <Header onBack={() => router.back()} />
        <View style={styles.stateBox}>
          <Ionicons name="checkmark-circle" size={48} color={colors.success} />
          <Text style={styles.stateText}>{done.message}</Text>
          <Pressable style={styles.retryBtn} onPress={() => router.back()}>
            <Text style={styles.retryText}>返回</Text>
          </Pressable>
        </View>
      </SafeAreaView>
    );
  }

  return (
    <SafeAreaView style={styles.safeArea} edges={['top', 'bottom']}>
      <Header onBack={() => router.back()} />
      <ScrollView
        style={styles.scroll}
        contentContainerStyle={styles.content}
        showsVerticalScrollIndicator={false}
      >
        <View style={[styles.warnCard, { backgroundColor: colors.dangerLight }]}>
          <Ionicons name="warning-outline" size={18} color={colors.dangerText} />
          <Text style={[styles.warnText, { color: colors.dangerText }]}>
            注销后账号将无法恢复，请谨慎操作
          </Text>
        </View>

        <View style={styles.section}>
          <Text style={styles.sectionTitle}>注销后将发生</Text>
          <View style={styles.card}>
            {data.consequences.map((item, index) => (
              <View
                key={index}
                style={[styles.bulletRow, index < data.consequences.length - 1 && styles.bulletBorder]}
              >
                <Ionicons name="close-circle-outline" size={18} color={colors.danger} />
                <Text style={styles.bulletText}>{item}</Text>
              </View>
            ))}
          </View>
        </View>

        <View style={styles.section}>
          <Text style={styles.sectionTitle}>注销前待办</Text>
          <View style={styles.card}>
            {data.checklist.map((item, index) => (
              <View
                key={item.id}
                style={[styles.checkRow, index < data.checklist.length - 1 && styles.rowBorder]}
              >
                <View style={styles.rowBody}>
                  <Text style={styles.rowTitle}>{item.label}</Text>
                  {item.actionText ? (
                    <Pressable onPress={() => console.log('[account-cancel] 去处理', item.id)}>
                      <Text style={styles.actionText}>{item.actionText}</Text>
                    </Pressable>
                  ) : null}
                </View>
                <Ionicons
                  name={item.resolved ? 'checkmark-circle' : 'ellipse-outline'}
                  size={20}
                  color={item.resolved ? colors.success : colors.textHint}
                />
              </View>
            ))}
          </View>
        </View>

        <View style={styles.section}>
          <Text style={styles.sectionTitle}>注销原因（选填）</Text>
          <View style={styles.chipWrap}>
            {data.reasons.map((r) => {
              const active = reason === r;
              return (
                <Pressable
                  key={r}
                  style={[styles.chip, active && styles.chipActive]}
                  onPress={() => setReason(active ? '' : r)}
                >
                  <Text style={[styles.chipText, active && styles.chipTextActive]}>{r}</Text>
                </Pressable>
              );
            })}
          </View>
        </View>

        <Pressable
          style={[styles.submitBtn, (!data.canCancel || submitting) && styles.submitDisabled]}
          disabled={!data.canCancel || submitting}
          onPress={handleSubmit}
        >
          <Text style={styles.submitText}>
            {submitting ? '提交中…' : data.canCancel ? '申请注销' : '请先完成注销前待办'}
          </Text>
        </Pressable>
      </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: {
    flex: 1,
    textAlign: 'center',
    fontSize: 17,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  scroll: {
    flex: 1,
  },
  content: {
    padding: 12,
    paddingBottom: 24,
  },
  stateBox: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    gap: 12,
  },
  stateText: {
    marginTop: 12,
    fontSize: 14,
    color: colors.textSecondary,
    paddingHorizontal: 32,
    textAlign: 'center',
  },
  retryBtn: {
    marginTop: 16,
    paddingHorizontal: 24,
    paddingVertical: 8,
    borderRadius: 18,
    backgroundColor: colors.primaryBtn,
  },
  retryText: {
    fontSize: 13,
    fontWeight: '600',
    color: colors.white,
  },
  warnCard: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 8,
    borderRadius: 12,
    padding: 14,
    marginBottom: 16,
  },
  warnText: {
    flex: 1,
    fontSize: 13,
    fontWeight: '600',
    lineHeight: 18,
  },
  section: {
    marginBottom: 16,
  },
  sectionTitle: {
    fontSize: 14,
    fontWeight: '700',
    color: colors.textPrimary,
    marginBottom: 10,
  },
  card: {
    backgroundColor: colors.white,
    borderRadius: 12,
    overflow: 'hidden',
  },
  bulletRow: {
    flexDirection: 'row',
    alignItems: 'flex-start',
    paddingHorizontal: 14,
    paddingVertical: 12,
    gap: 8,
  },
  bulletBorder: {
    borderBottomWidth: 1,
    borderBottomColor: colors.borderLight,
  },
  bulletText: {
    flex: 1,
    fontSize: 13,
    lineHeight: 19,
    color: colors.textSecondary,
  },
  checkRow: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: 14,
    paddingVertical: 14,
  },
  rowBorder: {
    borderBottomWidth: 1,
    borderBottomColor: colors.borderLight,
  },
  rowBody: {
    flex: 1,
    marginRight: 12,
  },
  rowTitle: {
    fontSize: 15,
    fontWeight: '600',
    color: colors.textPrimary,
  },
  actionText: {
    marginTop: 3,
    fontSize: 12,
    fontWeight: '600',
    color: colors.primary,
  },
  chipWrap: {
    flexDirection: 'row',
    flexWrap: 'wrap',
    gap: 8,
  },
  chip: {
    paddingVertical: 7,
    paddingHorizontal: 14,
    borderRadius: 16,
    backgroundColor: colors.white,
    borderWidth: 1,
    borderColor: colors.border,
  },
  chipActive: {
    backgroundColor: colors.primaryLight,
    borderColor: colors.primary,
  },
  chipText: {
    fontSize: 13,
    fontWeight: '600',
    color: colors.textSecondary,
  },
  chipTextActive: {
    color: colors.primary,
  },
  submitBtn: {
    marginTop: 8,
    height: 48,
    borderRadius: 24,
    backgroundColor: colors.danger,
    alignItems: 'center',
    justifyContent: 'center',
  },
  submitDisabled: {
    backgroundColor: colors.border,
  },
  submitText: {
    fontSize: 15,
    fontWeight: '700',
    color: colors.white,
  },
});