import React, { useEffect, useMemo, useRef, useState } from 'react';
import { Button, Form, Input, message, Space } from 'antd';
import {
  CheckCircleFilled,
  FileSearchOutlined,
  LoadingOutlined,
  SafetyCertificateFilled
} from '@ant-design/icons';
import './index.css';
import { materialFields, materialInitialValues, mockSubmitMaterial } from './mockData';

const steps = [
  { key: 1, title: '填写信息' },
  { key: 2, title: '认证审核中' },
  { key: 3, title: '认证通过' }
];

function PageHeader() {
  return (
    <div className="material-report-header">
      <div className="material-report-brand">
        <span className="material-report-logo"><SafetyCertificateFilled /></span>
        <span>巫溪县安全评价在线监管一件事</span>
      </div>
      <div className="material-report-hero">
        <h1>认证信息</h1>
        <div className="material-report-hero-art">
          <div className="verify-platform"><CheckCircleFilled /></div>
          <div className="verify-card" />
        </div>
      </div>
    </div>
  );
}

function StepHeader({ current }) {
  return (
    <div className="material-report-steps">
      {steps.map((step, index) => {
        const active = current >= step.key;
        const currentStep = current === step.key;
        return (
          <div key={step.key} className={`material-step ${active ? 'is-active' : ''} ${currentStep ? 'is-current' : ''}`}>
            <span className="material-step__dot">{step.key}</span>
            <span className="material-step__title">{step.title}</span>
            {index < steps.length - 1 && <i className="material-step__line" />}
          </div>
        );
      })}
    </div>
  );
}

function FieldItem({ field }) {
  const labelLines = field.label.split('\n');
  return (
    <div className={`material-form-field material-form-field--${field.span}`}>
      <Form.Item
        name={field.name}
        label={(
          <span>
            {labelLines.map((line) => <React.Fragment key={line}>{line}<br /></React.Fragment>)}
          </span>
        )}
        rules={field.span === 24 ? [{ required: true, message: `请输入${labelLines[0]}` }] : undefined}
      >
        <Input />
      </Form.Item>
    </div>
  );
}

function FillStep({ onSubmitted }) {
  const [form] = Form.useForm();
  const [submitting, setSubmitting] = useState(false);

  const groupedRows = useMemo(() => {
    const rows = [];
    let current = [];
    let used = 0;
    materialFields.forEach((field) => {
      if (field.span === 24) {
        if (current.length) rows.push(current);
        rows.push([field]);
        current = [];
        used = 0;
        return;
      }
      if (used + field.span > 24) {
        rows.push(current);
        current = [];
        used = 0;
      }
      current.push(field);
      used += field.span;
    });
    if (current.length) rows.push(current);
    return rows;
  }, []);

  const handleSubmit = async () => {
    try {
      const values = await form.validateFields();
      setSubmitting(true);
      const res = await mockSubmitMaterial(values);
      if (res?.success) {
        message.success('提交成功，正在进入认证审核');
        onSubmitted(res.data);
      }
    }
    catch (err) {
      if (!err?.errorFields) {
        message.error('提交失败，请稍后重试');
      }
    }
    finally {
      setSubmitting(false);
    }
  };

  return (
    <div className="material-fill-step">
      <Form form={form} initialValues={materialInitialValues} colon={false} labelAlign="right">
        <div className="material-form-grid">
          {groupedRows.map((row, index) => (
            <div key={index} className="material-form-row">
              {row.map((field) => <FieldItem key={field.name} field={field} />)}
            </div>
          ))}
        </div>
      </Form>
      <div className="material-form-actions">
        <Space size={10}>
          <Button>取消</Button>
          <Button className="material-save-btn">保存</Button>
          <Button type="primary" loading={submitting} onClick={handleSubmit}>提交</Button>
        </Space>
      </div>
    </div>
  );
}

function ReviewLoadingStep() {
  return (
    <div className="material-result-wrap">
      <div className="review-loading-icon">
        <div className="review-loading-ring" />
        <FileSearchOutlined />
        <span />
      </div>
      <p>认证审核中，请耐心等待...</p>
    </div>
  );
}

function ReviewSuccessStep() {
  return (
    <div className="material-result-wrap material-success-wrap">
      <div className="review-success-illustration">
        <div className="success-paper">
          <i /><i /><i /><i />
        </div>
        <CheckCircleFilled />
      </div>
      <p>审核通过</p>
    </div>
  );
}

export default function MaterialReportPage() {
  const [current, setCurrent] = useState(1);
  const timerRef = useRef(null);

  useEffect(() => () => clearTimeout(timerRef.current), []);

  const handleSubmitted = () => {
    setCurrent(2);
    clearTimeout(timerRef.current);
    timerRef.current = setTimeout(() => {
      setCurrent(3);
    }, 2300);
  };

  return (
    <div className={`material-report-page material-report-page--step-${current}`}>
      <PageHeader />
      <StepHeader current={current} />
      {current === 1 && <FillStep onSubmitted={handleSubmitted} />}
      {current === 2 && <ReviewLoadingStep />}
      {current === 3 && <ReviewSuccessStep />}
    </div>
  );
}