import { Button, Toast } from '@ant-design/react-native';
import { Ionicons } from '@expo/vector-icons';
import { router } from 'expo-router';
import React, { useRef, useState } from 'react';
import {
  KeyboardAvoidingView,
  Platform,
  Pressable,
  ScrollView,
  StyleSheet,
  Text,
  TextInput,
  View,
} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';

function FieldLabel({ children }: { children: React.ReactNode }) {
  return (
    <Text className="mb-2 ml-1 text-xs font-bold uppercase tracking-widest text-outline">
      {children}
    </Text>
  );
}

export default function SignUpScreen() {
  const [mobile, setMobile] = useState('');
  const [password, setPassword] = useState('');
  const [email, setEmail] = useState('');
  const [name, setName] = useState('');
  const [organization, setOrganization] = useState('');
  const [agreed, setAgreed] = useState(false);
  const [flushAgree, setFlushAgree] = useState(false);
  const [loading, setLoading] = useState(false);
  const scrollView = useRef<ScrollView>(null);

  const handleRegister = async () => {
    setFlushAgree(false);

    if (mobile.trim().length !== 11) {
      Toast.fail('请输入正确的手机号');
      return;
    }

    if (password.trim().length < 6) {
      Toast.fail('请输入不少于 6 位的登录密码');
      return;
    }

    if (!email.includes('@')) {
      Toast.fail('请输入正确的邮箱');
      return;
    }

    if (!name.trim()) {
      Toast.fail('请输入姓名');
      return;
    }

    if (!organization.trim()) {
      Toast.fail('请输入所属机构');
      return;
    }

    if (!agreed) {
      Toast.fail('请先阅读并同意协议');
      setFlushAgree(true);
      scrollView.current?.scrollToEnd({ animated: true });
      return;
    }

    setLoading(true);
    const toastKey = Toast.loading('正在创建账号...');

    try {
      await new Promise((resolve) => setTimeout(resolve, 600));
      Toast.success('注册成功，请登录');
      router.replace('/sign-in');
    } catch (error) {
      console.error('注册失败:', error);
      Toast.fail('注册失败，请稍后重试');
    } finally {
      setLoading(false);
      Toast.remove(toastKey);
    }
  };

  return (
    <SafeAreaView className="flex-1 bg-surface">
      <KeyboardAvoidingView
        className="flex-1"
        behavior={Platform.OS === 'ios' ? 'padding' : undefined}
      >
        <ScrollView
          ref={scrollView}
          className="flex-1"
          contentContainerClassName="px-8 pt-12 pb-10"
          contentContainerStyle={{ flexGrow: 1 }}
          keyboardShouldPersistTaps="handled"
          showsVerticalScrollIndicator={false}
        >
          <View className="absolute -top-24 -right-24 h-96 w-96 rounded-full bg-primary-container/10" />
          <View className="absolute top-32 -left-20 h-64 w-64 rounded-full bg-secondary-container/20" />
          <View className="absolute -bottom-16 right-0 h-48 w-48 rounded-full bg-primary-fixed/50" />

          <View className="flex-1 justify-between">
            <View>
              <View className="mb-12">
                <View className="mb-6 h-16 w-16 items-center justify-center rounded-2xl bg-primary-container shadow-lg">
                  <Ionicons name="sparkles" size={30} color="#ffffff" />
                </View>
                <Text className="mb-2 text-4xl font-extrabold tracking-tight text-on-surface">
                  创建账号
                </Text>
                <Text className="text-base font-medium leading-7 text-on-surface-variant">
                  完善基础信息，开启您的智能借贷助手工作台
                </Text>
              </View>

              <View className="mb-8 rounded-2xl bg-surface-container-lowest p-3 shadow-sm">
                <View className="px-2 pb-2">
                  <FieldLabel>手机号码</FieldLabel>
                  <View className="mb-5 flex-row items-center rounded-2xl bg-surface-container-low px-5 py-4">
                    <Text className="text-2xl font-bold text-on-surface">+86</Text>
                    <View
                      className="mx-4 h-5 bg-outline-variant/40"
                      style={{ width: StyleSheet.hairlineWidth }}
                    />
                    <TextInput
                      value={mobile}
                      onChangeText={setMobile}
                      editable={!loading}
                      keyboardType="phone-pad"
                      maxLength={11}
                      placeholder="请输入手机号"
                      placeholderTextColor="#9ca3af"
                      className="flex-1 p-0 text-xl font-medium text-on-surface"
                    />
                    <Ionicons
                      name="phone-portrait-outline"
                      size={22}
                      color="#c3c6d7"
                    />
                  </View>

                  <FieldLabel>登录密码</FieldLabel>
                  <View className="mb-5 flex-row items-center rounded-2xl bg-surface-container-low px-5 py-4">
                    <TextInput
                      value={password}
                      onChangeText={setPassword}
                      editable={!loading}
                      secureTextEntry
                      maxLength={20}
                      placeholder="请输入不少于 6 位的密码"
                      placeholderTextColor="#9ca3af"
                      className="flex-1 p-0 text-xl font-medium text-on-surface"
                    />
                    <Ionicons name="lock-closed-outline" size={22} color="#c3c6d7" />
                  </View>

                  <FieldLabel>邮箱</FieldLabel>
                  <View className="mb-5 flex-row items-center rounded-2xl bg-surface-container-low px-5 py-4">
                    <TextInput
                      value={email}
                      onChangeText={setEmail}
                      editable={!loading}
                      keyboardType="email-address"
                      autoCapitalize="none"
                      placeholder="请输入常用邮箱"
                      placeholderTextColor="#9ca3af"
                      className="flex-1 p-0 text-xl font-medium text-on-surface"
                    />
                    <Ionicons name="mail-outline" size={22} color="#c3c6d7" />
                  </View>

                  <FieldLabel>姓名</FieldLabel>
                  <View className="mb-5 flex-row items-center rounded-2xl bg-surface-container-low px-5 py-4">
                    <TextInput
                      value={name}
                      onChangeText={setName}
                      editable={!loading}
                      placeholder="请输入姓名"
                      placeholderTextColor="#9ca3af"
                      className="flex-1 p-0 text-xl font-medium text-on-surface"
                    />
                    <Ionicons name="person-outline" size={22} color="#c3c6d7" />
                  </View>

                  <FieldLabel>所属机构</FieldLabel>
                  <View className="flex-row items-center rounded-2xl bg-surface-container-low px-5 py-4">
                    <TextInput
                      value={organization}
                      onChangeText={setOrganization}
                      editable={!loading}
                      placeholder="请输入所属机构"
                      placeholderTextColor="#9ca3af"
                      className="flex-1 p-0 text-xl font-medium text-on-surface"
                    />
                    <Ionicons name="business-outline" size={22} color="#c3c6d7" />
                  </View>
                </View>
              </View>

              <View className="mb-8 gap-4">
                <Button type="primary" loading={loading} onPress={handleRegister}>
                  注册账号
                </Button>

                <View className="flex-row items-center justify-between px-3">
                  <Pressable hitSlop={8} onPress={() => router.back()}>
                    <Text className="text-lg font-medium text-on-surface-variant">
                      返回登录
                    </Text>
                  </Pressable>
                  <Pressable hitSlop={8}>
                    <Text className="text-lg font-medium text-on-surface-variant">
                      遇到问题？
                    </Text>
                  </Pressable>
                </View>
              </View>
            </View>

            <View className="pt-4">
              <View
                className={`flex-row items-start gap-3 rounded-md border-2 border-transparent px-2 transition delay-300 ${
                  flushAgree ? 'border-primary/50' : ''
                }`}
              >
                <Pressable
                  onPress={() => setAgreed((value) => !value)}
                  hitSlop={8}
                  className="pt-1"
                >
                  <View
                    className={`h-6 w-6 items-center justify-center rounded-full ${
                      agreed
                        ? 'border-primary bg-primary'
                        : 'border-outline-variant bg-surface-container-low'
                    }`}
                  >
                    {agreed ? (
                      <Ionicons name="checkmark" size={14} color="#ffffff" />
                    ) : null}
                  </View>
                </Pressable>
                <Text className="flex-1 text-sm leading-7 text-on-surface-variant">
                  注册即代表您已阅读并同意
                  <Text className="cursor-pointer font-semibold text-primary">
                    《用户服务协议》
                  </Text>
                  、
                  <Text className="cursor-pointer font-semibold text-primary">
                    《隐私政策》
                  </Text>
                  ，并授权该应用用于账户创建与服务通知。
                </Text>
              </View>
            </View>
          </View>
        </ScrollView>
      </KeyboardAvoidingView>
    </SafeAreaView>
  );
}