import React, { useEffect, useState } from 'react';
import { useDispatch, useSelector } from 'react-redux';
import { Link, useNavigate } from 'react-router-dom';
import { checkAuthThunk, signupThunk } from '../../store/auth/auth.thunk';

// 部门和组别映射关系
const departmentGroups = {
    '技术部': ['开发组', '测试组', '运维组'],
    '产品部': ['产品规划组', '用户研究组', '交互设计组', '项目管理组'],
    '市场部': ['品牌推广组', '市场调研组', '客户关系组', '社交媒体组'],
    '行政部': ['人事组', '财务组', '行政管理组', '后勤组']
};

export default function Signup() {
    const dispatch = useDispatch();
    const navigate = useNavigate();
    const [formData, setFormData] = useState({
        username: '',
        email: '',
        password: '',
        name: '',
        role: 'member',
        department: '',
        group: '',
    });
    const [errors, setErrors] = useState({});
    const [submitted, setSubmitted] = useState(false);
    const [availableGroups, setAvailableGroups] = useState([]);

    const { user, loading } = useSelector((state) => state.auth);

    useEffect(() => {
        handleCheckAuth();
    }, [dispatch]);

    // 当部门变化时，更新可选的组别
    useEffect(() => {
        if (formData.department && departmentGroups[formData.department]) {
            setAvailableGroups(departmentGroups[formData.department]);
            // 如果已选择的组别不在新部门的选项中，则重置组别
            if (!departmentGroups[formData.department].includes(formData.group)) {
                setFormData(prev => ({
                    ...prev,
                    group: ''
                }));
            }
        } else {
            setAvailableGroups([]);
            setFormData(prev => ({
                ...prev,
                group: ''
            }));
        }
    }, [formData.department]);

    const handleCheckAuth = async () => {
        console.log('signup page handleCheckAuth');
        try {
            await dispatch(checkAuthThunk()).unwrap();
            if (user) navigate('/');
        } catch (error) {}
    };

    const handleInputChange = (e) => {
        const { name, value } = e.target;
        setFormData({
            ...formData,
            [name]: value,
        });

        // 清除对应的错误信息
        if (errors[name]) {
            setErrors({
                ...errors,
                [name]: '',
            });
        }
    };

    const validateForm = () => {
        const newErrors = {};
        if (!formData.username) {
            newErrors.username = 'Username is required';
        }

        if (!formData.email) {
            newErrors.email = 'Email is required';
        } else if (!/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i.test(formData.email)) {
            newErrors.email = 'Invalid email address';
        }

        if (!formData.password) {
            newErrors.password = 'Password is required';
        } else if (formData.password.length < 6) {
            newErrors.password = 'Password must be at least 6 characters';
        }

        if (!formData.name) {
            newErrors.name = 'Name is required';
        }

        if (!formData.department) {
            newErrors.department = '请选择部门';
        }

        if (!formData.group) {
            newErrors.group = '请选择组别';
        }

        setErrors(newErrors);
        return Object.keys(newErrors).length === 0;
    };

    const handleSubmit = async (e) => {
        e.preventDefault();
        setSubmitted(true);

        if (validateForm()) {
            console.log('Form submitted successfully!');
            console.log('Registration data:', formData);
            try {
                await dispatch(signupThunk(formData)).unwrap();
                navigate('/login');
            } catch (error) {
                console.error('Signup failed:', error);
            }
        }
    };

    return (
        <div className='position-absolute top-50 start-50 translate-middle d-flex flex-column gap-4 align-items-center'>
            <div className='title text-center h1'>OOIN 智能知识库</div>
            <form
                className='auth-form login-form d-flex flex-column gap-3 align-items-center'
                onSubmit={handleSubmit}
                noValidate
            >
                <div className='input-group has-validation'>
                    <input
                        type='text'
                        className={`form-control form-control-lg${submitted && errors.username ? ' is-invalid' : ''}`}
                        id='username'
                        name='username'
                        placeholder='用户名'
                        value={formData.username}
                        required
                        onChange={handleInputChange}
                        disabled={loading}
                    ></input>
                    {submitted && errors.username && <div className='invalid-feedback'>{errors.username}</div>}
                </div>
                <div className='input-group has-validation'>
                    <input
                        type='email'
                        className={`form-control form-control-lg${submitted && errors.email ? ' is-invalid' : ''}`}
                        id='email'
                        name='email'
                        placeholder='邮箱'
                        value={formData.email}
                        required
                        onChange={handleInputChange}
                        disabled={loading}
                    ></input>
                    {submitted && errors.email && <div className='invalid-feedback'>{errors.email}</div>}
                </div>
                <div className='input-group has-validation'>
                    <input
                        type='password'
                        id='password'
                        name='password'
                        placeholder='密码'
                        value={formData.password}
                        required
                        className={`form-control form-control-lg${submitted && errors.password ? ' is-invalid' : ''}`}
                        aria-describedby='passwordHelpBlock'
                        onChange={handleInputChange}
                        disabled={loading}
                    ></input>
                    {submitted && errors.password && <div className='invalid-feedback'>{errors.password}</div>}
                </div>
                <div className='input-group has-validation'>
                    <input
                        type='text'
                        className={`form-control form-control-lg${submitted && errors.name ? ' is-invalid' : ''}`}
                        id='name'
                        name='name'
                        placeholder='姓名'
                        value={formData.name}
                        required
                        onChange={handleInputChange}
                        disabled={loading}
                    ></input>
                    {submitted && errors.name && <div className='invalid-feedback'>{errors.name}</div>}
                </div>
                <div className='input-group has-validation'>
                    <select
                        className={`form-select form-select-lg${submitted && errors.department ? ' is-invalid' : ''}`}
                        id='department'
                        name='department'
                        value={formData.department}
                        onChange={handleInputChange}
                        disabled={loading}
                        required
                    >
                        <option value='' disabled>
                            选择部门
                        </option>
                        <option value='技术部'>技术部</option>
                        <option value='产品部'>产品部</option>
                        <option value='市场部'>市场部</option>
                        <option value='行政部'>行政部</option>
                    </select>
                    {submitted && errors.department && <div className='invalid-feedback'>{errors.department}</div>}
                </div>
                <div className='input-group has-validation'>
                    <select
                        className={`form-select form-select-lg${submitted && errors.group ? ' is-invalid' : ''}`}
                        id='group'
                        name='group'
                        value={formData.group}
                        onChange={handleInputChange}
                        disabled={loading || !formData.department}
                        required
                    >
                        <option value='' disabled>
                            {formData.department ? '选择组别' : '请先选择部门'}
                        </option>
                        {availableGroups.map((group, index) => (
                            <option key={index} value={group}>
                                {group}
                            </option>
                        ))}
                    </select>
                    {submitted && errors.group && <div className='invalid-feedback'>{errors.group}</div>}
                </div>
                <div className='input-group'>
                    <select
                        className='form-select form-select-lg'
                        id='role'
                        name='role'
                        value={formData.role}
                        onChange={handleInputChange}
                        disabled={loading}
                    >
                        <option value='member'>普通成员</option>
                        <option value='leader'>组长</option>
                        <option value='admin'>管理员</option>
                    </select>
                </div>
                <button type='submit' className='btn btn-dark btn-lg w-100' disabled={loading}>
                    {loading ? (
                        <>
                            <span
                                className='spinner-border spinner-border-sm me-2'
                                role='status'
                                aria-hidden='true'
                            ></span>
                            注册中...
                        </>
                    ) : (
                        '注册'
                    )}
                </button>
            </form>
            <Link to='/login' className='go-to-signup w-100 link-underline-light h5 text-center'>
                已有账号？立即登录
            </Link>
        </div>
    );
}