import { useEffect, useState } from 'react';
import { LockOutlined, MailOutlined, NumberOutlined, UserOutlined } from '@ant-design/icons';
import { Button, Checkbox, Form, Input, message, Space } from 'antd';
import { NavLink, useNavigate } from 'react-router';
import authApi from "../../api/authApi";
import type { RejisterRequest } from "../../api/type";
import type { AxiosResponse } from 'axios';

// 定义表单字段的类型
interface FormValues {
    name: string;
    email: string;
    verifyCode: string;
    password: string;
    confirmPassword: string;
    agreement: boolean;
}

function Register() {
    const [countdown, setCountdown] = useState(0);
    const [form] = Form.useForm<FormValues>();
    const emailValue = Form.useWatch('email', form);
    const [messageApi, contextHolder] = message.useMessage();
    const nav = useNavigate(); // 用于页面跳转

    // 校验邮箱格式
    function isValidEmail(email: string): boolean {
        const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
        return emailRegex.test(email);
    }

    // 发送验证码
    const sendVerificationCode = () => {
        if (!isValidEmail(emailValue)) {
            form.validateFields(['email']);
            return;
        }

        authApi.sendVerificationCode(emailValue).then(() => {
            setCountdown(60); // 开始倒计时
        }).catch((error) => {
            messageApi.error(error?.message || '验证码发送失败');
        });
    };

    // 倒计时处理
    useEffect(() => {
        if (countdown === 0) return;
        const timer = setInterval(() => {
            setCountdown(prev => {
                if (prev === 1) clearInterval(timer); // 倒计时结束
                return prev - 1;
            });
        }, 1000);

        return () => clearInterval(timer);
    }, [countdown]);

    // 表单提交
    const onFinish = (values: FormValues) => {
        const registerRequest: RejisterRequest = {
            username: values.name,
            email: values.email,
            verificationCode: values.verifyCode,
            password: values.password,
        };

        authApi.register(registerRequest).then((response: AxiosResponse) => {
            if (response.data.code === 200) {
                messageApi.success("注册成功");
                form.resetFields(); // 清空表单
                setTimeout(() => {
                    nav('/login'); // 注册成功后跳转到登录页面
                }, 1500);
            } else {
                messageApi.error(response.data.message);
            }
        }).catch((error) => {
            messageApi.error(error?.message || '注册失败，请重试');
        });
    };

    return (
        <Form
            form={form}
            style={{ maxWidth: 360 }}
            onFinish={onFinish}
            scrollToFirstError
        >
            <h2>注册</h2>
            {contextHolder}

            <Form.Item
                name="name"
                rules={[{ required: true, message: '请输入用户名' }]}
            >
                <Input prefix={<UserOutlined />} placeholder="请输入用户名" />
            </Form.Item>

            <Form.Item
                name="email"
                rules={[{ required: true, message: '请输入邮箱' }, { type: 'email', message: '邮箱格式错误' }]}
            >
                <Input
                    prefix={<MailOutlined />}
                    placeholder="请输入邮箱"
                />
            </Form.Item>

            <Form.Item
                name="verifyCode"
                rules={[{ required: true, message: '请填写验证码' }]}
            >
                <Space direction="horizontal" size="small">
                    <Input
                        prefix={<NumberOutlined />}
                        placeholder="请输入验证码"
                        style={{ flex: 1 }}
                    />
                    <Button
                        disabled={countdown > 0}
                        onClick={sendVerificationCode}
                        color="primary"
                        style={{ width: 120 }}
                    >
                        {countdown > 0 ? `${countdown}s后重试` : '发送验证码'}
                    </Button>
                </Space>
            </Form.Item>

            <Form.Item
                name="password"
                rules={[
                    { required: true, message: '请输入密码' },
                    { min: 6, message: '密码长度至少为6位' },
                ]}
            >
                <Input.Password
                    prefix={<LockOutlined />}
                    placeholder="请输入密码"
                />
            </Form.Item>

            <Form.Item
                name="confirmPassword"
                dependencies={['password']}
                rules={[
                    { required: true, message: '请确认密码' },
                    ({ getFieldValue }) => ({
                        validator(_, value) {
                            if (!value || getFieldValue('password') === value) {
                                return Promise.resolve();
                            }
                            return Promise.reject('两次输入的密码不一致');
                        },
                    }),
                ]}
            >
                <Input.Password
                    prefix={<LockOutlined />}
                    placeholder="请确认密码"
                />
            </Form.Item>

            <Form.Item
                name="agreement"
                valuePropName="checked"
                rules={[
                    {
                        validator: (_, value) =>
                            value ? Promise.resolve() : Promise.reject('请阅读并同意用户协议'),
                    },
                ]}
            >
                <Checkbox>我已阅读并同意用户协议：<a>《创驿平台用户协议》</a></Checkbox>
            </Form.Item>

            <Form.Item>
                <Button
                    type="primary"
                    htmlType="submit"
                    style={{ width: '100%' }}
                >
                    注册
                </Button>
                或 <NavLink to='/login'>返回登录</NavLink>
            </Form.Item>
        </Form>
    );
}

export default Register;