import { signIn, useAuthContext } from '@/utils/auth';
import { Toast } from '@ant-design/react-native';
import { Ionicons } from '@expo/vector-icons';
import { router, useLocalSearchParams } from 'expo-router';
import React, { 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 SignInScreen({
  callback,
}: {
  callback?: (signin: boolean) => void;
}) {
  const [authMode, setAuthMode] = useState<'sms' | 'password'>('sms');
  const [agreed, setAgreed] = useState(false);
  const [loading, setLoading] = useState(false);
  const [phone, setPhone] = useState('');
  const [code, setCode] = useState('');
  const [password, setPassword] = useState('');

  const { redirectTo } = useLocalSearchParams<{ redirectTo?: string }>();
  const { setToken } = useAuthContext();

  const handleSendCode = () => {
    if (phone.trim().length !== 11) {
      Toast.fail('请先输入 11 位手机号');
      return;
    }
    Toast.success('验证码已发送');
  };

  const handleLogin = async () => {
    if (!agreed) {
      Toast.fail('请先阅读并同意协议');
      callback?.(false);
      return;
    }

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

    if (authMode === 'sms' && code.trim().length !== 6) {
      Toast.fail('请输入 6 位验证码');
      callback?.(false);
      return;
    }

    if (authMode === 'password' && password.trim().length < 6) {
      Toast.fail('请输入不少于 6 位的密码');
      callback?.(false);
      return;
    }

    setLoading(true);
    const toastKey = Toast.loading('正在登录...');

    try {
      const token = await signIn(1);
      setToken(token);
      Toast.success('登录成功');
      callback?.(true);

      const nextRoute =
        typeof redirectTo === 'string' && redirectTo.startsWith('/')
          ? redirectTo
          : '/';
      router.replace(nextRoute as never);
    } catch (error) {
      console.error('登录失败:', error);
      Toast.fail('登录失败，请稍后重试');
      callback?.(false);
    } finally {
      setLoading(false);
      Toast.remove(toastKey);
    }
  };

  return (
    <SafeAreaView className="flex-1 bg-surface">
      <KeyboardAvoidingView
        className="flex-1"
        behavior={Platform.OS === 'ios' ? 'padding' : undefined}
      >
        <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="business" size={30} color="#ffffff" />
                </View>
                <Text className="mb-2 text-4xl font-extrabold tracking-tight text-on-surface">
                  欢迎回来
                </Text>
                <Text className="text-base font-medium leading-7 text-on-surface-variant">
                  登录贷款助手，开启您的财务管理之旅
                </Text>
              </View>

              <View className="mb-8 rounded-2xl bg-surface-container-lowest p-3 shadow-sm">
                <View className="mb-6 flex-row rounded-2xl bg-surface-container-low p-1">
                  {[
                    ['sms', '验证码登录'],
                    ['password', '密码登录'],
                  ].map(([mode, label]) => {
                    const active = authMode === mode;
                    return (
                      <Pressable
                        key={mode}
                        disabled={loading}
                        onPress={() => setAuthMode(mode as 'sms' | 'password')}
                        className={`flex-1 rounded-xl px-4 py-3 ${
                          active ? 'bg-surface-container-lowest' : ''
                        }`}
                        style={({ pressed }) => ({
                          opacity: loading ? 0.5 : pressed ? 0.86 : 1,
                          transform: [{ scale: pressed ? 0.99 : 1 }],
                        })}
                      >
                        <Text
                          className={`text-center text-base font-bold ${
                            active ? 'text-primary' : 'text-on-surface-variant'
                          }`}
                        >
                          {label}
                        </Text>
                      </Pressable>
                    );
                  })}
                </View>

                <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={phone}
                      onChangeText={setPhone}
                      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>{authMode === 'sms' ? '验证码' : '密码'}</FieldLabel>
                  <View className="flex-row items-center rounded-2xl bg-surface-container-low px-5 py-4">
                    <TextInput
                      value={authMode === 'sms' ? code : password}
                      onChangeText={authMode === 'sms' ? setCode : setPassword}
                      editable={!loading}
                      keyboardType={authMode === 'sms' ? 'number-pad' : 'default'}
                      maxLength={authMode === 'sms' ? 6 : 20}
                      secureTextEntry={authMode === 'password'}
                      placeholder={
                        authMode === 'sms'
                          ? '请输入 6 位验证码'
                          : '请输入登录密码'
                      }
                      placeholderTextColor="#9ca3af"
                      className="flex-1 p-0 text-xl font-medium text-on-surface"
                    />
                    {authMode === 'sms' ? (
                      <Pressable
                        disabled={loading}
                        hitSlop={8}
                        onPress={handleSendCode}
                        style={({ pressed }) => ({
                          opacity: loading ? 0.5 : pressed ? 0.72 : 1,
                        })}
                      >
                        <Text className="text-lg font-bold leading-6 text-primary">
                          获取验证码
                        </Text>
                      </Pressable>
                    ) : (
                      <Ionicons name="lock-closed-outline" size={22} color="#c3c6d7" />
                    )}
                  </View>
                </View>
              </View>

              <View className="mb-8 gap-4">
                <Pressable
                  disabled={loading}
                  onPress={handleLogin}
                  className="items-center justify-center rounded-2xl bg-primary-container py-5 shadow-lg"
                  style={({ pressed }) => ({
                    opacity: loading ? 0.6 : pressed ? 0.88 : 1,
                    transform: [{ scale: pressed ? 0.985 : 1 }],
                  })}
                >
                  <Text className="text-2xl font-extrabold text-on-primary">
                    {loading ? '登录中...' : '立即登录'}
                  </Text>
                </Pressable>

                <View className="flex-row items-center justify-between px-3">
                  <Pressable hitSlop={8}>
                    <Text className="text-lg font-medium text-on-surface-variant">
                      注册账号
                    </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="mb-8 flex-row items-center gap-4">
                <View className="h-px flex-1 bg-surface-container-highest" />
                <Text className="text-sm font-bold tracking-widest text-outline">
                  其他方式登录
                </Text>
                <View className="h-px flex-1 bg-surface-container-highest" />
              </View>

              <View className="mb-10 flex-row justify-center gap-10">
                {[
                  ['chatbubble-ellipses-outline', '#6b7280'],
                  ['logo-apple', '#6b7280'],
                ].map(([icon, color]) => (
                  <Pressable
                    key={icon}
                    className="h-14 w-14 items-center justify-center rounded-full bg-surface-container-low"
                    style={({ pressed }) => ({
                      opacity: pressed ? 0.8 : 1,
                      transform: [{ scale: pressed ? 0.94 : 1 }],
                    })}
                  >
                    <Ionicons
                      name={icon as keyof typeof Ionicons.glyphMap}
                      size={24}
                      color={color}
                    />
                  </Pressable>
                ))}
              </View>

              <View className="flex-row items-start gap-3 px-2">
                <Pressable
                  onPress={() => setAgreed((value) => !value)}
                  hitSlop={8}
                  className="pt-1"
                >
                  <View
                    className={`h-6 w-6 items-center justify-center rounded-full border ${
                      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">
                  登录即代表您已阅读并同意
                  <Text className="font-semibold text-primary">《用户服务协议》</Text>
                  、
                  <Text className="font-semibold text-primary">《隐私政策》</Text>
                  ，以及授权该应用获取您的公开信息。
                </Text>
              </View>
            </View>
          </View>
        </ScrollView>
      </KeyboardAvoidingView>
    </SafeAreaView>
  );
}