import { useEffect, useState } from 'react';
import { useNavigate, useSearchParams } from 'react-router-dom';
import {
  INVOICE_KIND_LABELS,
  INVOICE_TITLE_TYPE_LABELS,
  type InvoiceKind,
  type InvoiceTitleType,
} from '@dukang/shared-types';
import SubPageHeader from '../components/SubPageHeader';
import { request } from '../lib/api';

type OrderRow = { id: string; orderNo: string; payAmount: number | string; productName?: string };

export default function InvoiceApplyPage() {
  const navigate = useNavigate();
  const [params] = useSearchParams();
  const presetOrderId = params.get('orderId') || '';

  const [orders, setOrders] = useState<OrderRow[]>([]);
  const [orderId, setOrderId] = useState(presetOrderId);
  const [titleType, setTitleType] = useState<InvoiceTitleType>('PERSONAL');
  const [invoiceKind, setInvoiceKind] = useState<InvoiceKind>('NORMAL');
  const [titleName, setTitleName] = useState('');
  const [taxNo, setTaxNo] = useState('');
  const [addressPhone, setAddressPhone] = useState('');
  const [bankAccount, setBankAccount] = useState('');
  const [email, setEmail] = useState('');
  const [phone, setPhone] = useState('');
  const [submitting, setSubmitting] = useState(false);

  useEffect(() => {
    request<{ list?: OrderRow[] }>('USER_H5', '/trade/orders?tab=completed&pageSize=50')
      .then((res) => setOrders(res.list ?? []))
      .catch(() => setOrders([]));
  }, []);

  useEffect(() => {
    if (invoiceKind === 'SPECIAL') setTitleType('ENTERPRISE');
  }, [invoiceKind]);

  async function submit() {
    if (!orderId) {
      window.alert('请选择订单');
      return;
    }
    if (!titleName.trim() || !email.trim() || !phone.trim()) {
      window.alert('请填写抬头名称、邮箱与手机号');
      return;
    }
    setSubmitting(true);
    try {
      await request('USER_H5', `/trade/orders/${orderId}/invoices`, {
        method: 'POST',
        body: JSON.stringify({
          titleType,
          invoiceKind,
          titleName: titleName.trim(),
          taxNo: taxNo.trim() || undefined,
          addressPhone: addressPhone.trim() || undefined,
          bankAccount: bankAccount.trim() || undefined,
          email: email.trim(),
          phone: phone.trim(),
        }),
      });
      window.alert('发票申请已提交，总部将在 2 个工作日内开具');
      navigate('/invoices');
    } catch (e) {
      window.alert(e instanceof Error ? e.message : '申请失败');
    } finally {
      setSubmitting(false);
    }
  }

  return (
    <div className="after-sale-page">
      <SubPageHeader title="申请发票" onBack={() => navigate(-1)} />
      <main className="after-sale-body after-sale-form">
        <label className="after-sale-label">选择已完成订单</label>
        <div className="after-sale-order-list" style={{ marginBottom: 16 }}>
          {orders.length === 0 ? (
            <p className="after-sale-empty">暂无已完成订单</p>
          ) : (
            orders.map((o) => (
              <button
                key={o.id}
                type="button"
                className={`after-sale-order-item${orderId === o.id ? ' is-selected' : ''}`}
                onClick={() => setOrderId(o.id)}
              >
                <p className="after-sale-order-no">{o.orderNo}</p>
                <p className="after-sale-order-meta">
                  {o.productName || '商品'} · ¥{Number(o.payAmount).toFixed(2)}
                </p>
              </button>
            ))
          )}
        </div>

        <label className="after-sale-label">发票类型</label>
        <div className="invoice-chip-row">
          {(Object.keys(INVOICE_KIND_LABELS) as InvoiceKind[]).map((k) => (
            <button
              key={k}
              type="button"
              className={`invoice-chip${invoiceKind === k ? ' is-selected' : ''}`}
              onClick={() => setInvoiceKind(k)}
            >
              {INVOICE_KIND_LABELS[k]}
            </button>
          ))}
        </div>

        <label className="after-sale-label">抬头类型</label>
        <div className="invoice-chip-row">
          {(Object.keys(INVOICE_TITLE_TYPE_LABELS) as InvoiceTitleType[]).map((t) => (
            <button
              key={t}
              type="button"
              className={`invoice-chip${titleType === t ? ' is-selected' : ''}`}
              disabled={invoiceKind === 'SPECIAL' && t === 'PERSONAL'}
              onClick={() => setTitleType(t)}
            >
              {INVOICE_TITLE_TYPE_LABELS[t]}
            </button>
          ))}
        </div>

        <label className="after-sale-label">抬头名称</label>
        <input className="after-sale-input" value={titleName} onChange={(e) => setTitleName(e.target.value)} placeholder="个人姓名或公司全称" />

        {(titleType === 'ENTERPRISE' || invoiceKind === 'SPECIAL') && (
          <>
            <label className="after-sale-label">税号</label>
            <input className="after-sale-input" value={taxNo} onChange={(e) => setTaxNo(e.target.value)} placeholder="纳税人识别号" />
          </>
        )}

        {invoiceKind === 'SPECIAL' && (
          <>
            <label className="after-sale-label">地址与电话</label>
            <input className="after-sale-input" value={addressPhone} onChange={(e) => setAddressPhone(e.target.value)} />
            <label className="after-sale-label">开户行与账号</label>
            <input className="after-sale-input" value={bankAccount} onChange={(e) => setBankAccount(e.target.value)} />
          </>
        )}

        <label className="after-sale-label">接收邮箱</label>
        <input className="after-sale-input" type="email" value={email} onChange={(e) => setEmail(e.target.value)} />
        <label className="after-sale-label">手机号</label>
        <input className="after-sale-input" value={phone} onChange={(e) => setPhone(e.target.value)} />

        <button type="button" className="after-sale-primary" disabled={submitting} onClick={() => void submit()}>
          {submitting ? '提交中…' : '提交申请'}
        </button>
      </main>
    </div>
  );
}