import React, { useState, useEffect } from 'react';
import './FormModal.css';

const DEFAULT_FIELDS = [
  { key: 'name', label: '姓名', required: true, placeholder: '请输入姓名' },
  { key: 'email', label: '邮箱', required: true, placeholder: 'name@example.com' },
  { key: 'role', label: '角色', placeholder: '如：管理员' }
];

export default function FormModal({ visible = false, title = '表单', fields = DEFAULT_FIELDS, value = {}, onCancel, onSubmit }) {
  const [form, setForm] = useState(value);
  const [errors, setErrors] = useState({});

  useEffect(() => {
    if (visible) { setForm(value); setErrors({}); }
  }, [visible]);

  if (!visible) return null;

  const onInput = (key, e) => {
    setForm((f) => ({ ...f, [key]: e.target.value }));
    setErrors((er) => { const n = { ...er }; delete n[key]; return n; });
  };
  const submit = () => {
    const errs = {};
    fields.forEach((f) => {
      const v = (form[f.key] || '').trim();
      if (f.required && !v) errs[f.key] = f.label + '不能为空';
      if (f.key === 'email' && v && !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(v)) errs[f.key] = '邮箱格式不正确';
    });
    if (Object.keys(errs).length) { setErrors(errs); return; }
    if (onSubmit) onSubmit({ ...form });
    if (onCancel) onCancel();
  };

  return (
    <div className="aa-formmodal-mask" onClick={(e) => { if (e.target === e.currentTarget) onCancel && onCancel(); }}>
      <div className="aa-formmodal">
        <div className="aa-formmodal-head">
          <span>{title}</span>
          <button className="aa-formmodal-close" onClick={() => onCancel && onCancel()}>×</button>
        </div>
        <div className="aa-formmodal-body">
          {fields.map((f) => (
            <div className="aa-form-row" key={f.key}>
              <label className="aa-form-label">
                {f.required && <span className="req">*</span>}
                {f.label}
              </label>
              <input
                className={'aa-form-input' + (errors[f.key] ? ' is-error' : '')}
                value={form[f.key] || ''}
                placeholder={f.placeholder}
                onChange={(e) => onInput(f.key, e)}
              />
              {errors[f.key] && <div className="aa-form-err">{errors[f.key]}</div>}
            </div>
          ))}
        </div>
        <div className="aa-formmodal-foot">
          <button className="aa-btn" onClick={() => onCancel && onCancel()}>取消</button>
          <button className="aa-btn aa-btn--primary" onClick={submit}>提交</button>
        </div>
      </div>
    </div>
  );
}