import { useEffect, useRef, useState } from 'react';
import { useNavigate, useParams } from 'react-router-dom';
import QRCode from 'qrcode';
import PageHeader from '@dukang/shared-ui/PageHeader';
import { invokeWechatPay } from '@dukang/weixin-sdk';
import type { PartnerProxyOrderListItem, ProxyOrderPayResponse, ProxyPayMethod } from '@dukang/shared-types';
import { getToken, request } from '../lib/api';
import {
  proxyOrderPayLabel,
  proxyOrderStatusColor,
  proxyOrderStatusLabel,
} from '../lib/proxyOrderStatus';
import { toastError, toastSuccess } from '../lib/toast';
import { isWechatEnv } from '../lib/weixin';
import { fetchPartnerProfile, partnerHasWechatBinding } from '../lib/wechat-auth';

function fmtMoney(n: number) {
  return n.toLocaleString('zh-CN', { minimumFractionDigits: 2, maximumFractionDigits: 2 });
}

function fmtTime(value: string | undefined) {
  if (!value) return '—';
  const d = new Date(value);
  if (Number.isNaN(d.getTime())) return value;
  const pad = (n: number) => String(n).padStart(2, '0');
  return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}`;
}

function deliveryLabel(order: PartnerProxyOrderListItem) {
  const t = String(order.deliveryType || '').toUpperCase();
  if (t === 'ON_SITE_PICKUP') return '现场提货';
  if (t === 'CROSS_CITY') return '跨城配送';
  if (t === 'LOCAL') return '同城配送';
  return '代下单';
}

type TrackNode = {
  time?: string;
  status?: string;
  description?: string;
};

type TrackResult = {
  nodes?: TrackNode[];
  trackingNo?: string | null;
  provider?: string | null;
  manualQueryUrl?: string | null;
};

export default function ProxyOrderDetailPage() {
  const { id } = useParams();
  const navigate = useNavigate();
  const [order, setOrder] = useState<PartnerProxyOrderListItem | null>(null);
  const [error, setError] = useState('');
  const [track, setTrack] = useState<TrackResult | null>(null);
  const [trackError, setTrackError] = useState('');
  const [paying, setPaying] = useState(false);
  const [payMsg, setPayMsg] = useState('');
  const [payMethod, setPayMethod] = useState<ProxyPayMethod>('NATIVE');
  const [codeUrl, setCodeUrl] = useState<string | null>(null);
  const [qrDataUrl, setQrDataUrl] = useState<string | null>(null);
  const [cancelling, setCancelling] = useState(false);
  const pollRef = useRef<number | null>(null);

  function stopPoll() {
    if (pollRef.current != null) {
      window.clearInterval(pollRef.current);
      pollRef.current = null;
    }
  }

  useEffect(() => () => stopPoll(), []);

  useEffect(() => {
    document.title = '代下单详情';
  }, []);

  useEffect(() => {
    if (!id) return;
    void request<PartnerProxyOrderListItem>('PARTNER_H5', `/partner/proxy-orders/${id}`)
      .then((data) => {
        setOrder(data);
        if (data.proxyPayMethod) {
          setPayMethod(data.proxyPayMethod);
        }
      })
      .catch((e) => setError(e instanceof Error ? e.message : '加载失败'));
  }, [id]);

  useEffect(() => {
    if (!id || !order) return;
    const dt = String(order.deliveryType || '').toUpperCase();
    if (dt === 'ON_SITE_PICKUP' || order.payStatus !== 'PAID') {
      setTrack(null);
      return;
    }
    void request<TrackResult>('PARTNER_H5', `/partner/proxy-orders/${id}/track`, { silent: true })
      .then(setTrack)
      .catch((e) => setTrackError(e instanceof Error ? e.message : '物流暂不可用'));
  }, [id, order]);

  useEffect(() => {
    if (!codeUrl) {
      setQrDataUrl(null);
      return;
    }
    void QRCode.toDataURL(codeUrl, { width: 220, margin: 1 })
      .then(setQrDataUrl)
      .catch(() => setQrDataUrl(null));
  }, [codeUrl]);

  const unpaid = order?.payStatus === 'UNPAID' || order?.status === 'PENDING_PAY';

  function startPoll(orderId: string) {
    stopPoll();
    pollRef.current = window.setInterval(() => {
      void request<{ payStatus: string; orderNo: string }>(
        'PARTNER_H5',
        `/partner/proxy-orders/${orderId}/pay-status`,
        { silent: true },
      )
        .then((st) => {
          if (st.payStatus === 'PAID') {
            stopPoll();
            toastSuccess(`支付成功：${st.orderNo}`);
            void request<PartnerProxyOrderListItem>('PARTNER_H5', `/partner/proxy-orders/${orderId}`)
              .then(setOrder)
              .catch(() => undefined);
            setCodeUrl(null);
          }
        })
        .catch(() => undefined);
    }, 2000);
  }

  async function startPay(method: ProxyPayMethod) {
    if (!id) return;
    const locked = order?.proxyPayMethod;
    if (locked && locked !== method) {
      setPayMsg(
        locked === 'JSAPI'
          ? '该订单已发起微信代付，请先取消支付后重新下单'
          : '该订单已生成收款码，请先取消支付后重新下单',
      );
      return;
    }
    setPaying(true);
    setPayMsg('');
    setPayMethod(method);
    try {
      if (method === 'JSAPI') {
        if (!isWechatEnv()) {
          throw new Error('请在微信内打开合伙人端以使用微信代付');
        }
        const profile = await fetchPartnerProfile();
        if (!partnerHasWechatBinding(profile)) {
          throw new Error('请先绑定微信后再代付');
        }
      }

      const pay = await request<ProxyOrderPayResponse>(
        'PARTNER_H5',
        `/partner/proxy-orders/${id}/pay`,
        {
          method: 'POST',
          body: JSON.stringify({ payMethod: method }),
          silent: true,
        },
      );

      if (pay.mode === 'mock') {
        toastSuccess('支付成功');
        const refreshed = await request<PartnerProxyOrderListItem>(
          'PARTNER_H5',
          `/partner/proxy-orders/${id}`,
        );
        setOrder(refreshed);
        setCodeUrl(null);
        return;
      }

      if (pay.mode === 'native' && pay.codeUrl) {
        setCodeUrl(pay.codeUrl);
        setOrder((prev) => (prev ? { ...prev, proxyPayMethod: method } : prev));
        startPoll(id);
        return;
      }

      if (pay.mode === 'jsapi' && pay.prepay) {
        setCodeUrl(null);
        setOrder((prev) => (prev ? { ...prev, proxyPayMethod: method } : prev));
        await invokeWechatPay(pay.prepay, {
          apiBase: '/api/v1',
          clientApp: 'PARTNER_H5',
          getAccessToken: getToken,
          platform: 'wechat-h5',
        });
        startPoll(id);
        return;
      }

      throw new Error('支付发起失败');
    } catch (e) {
      setPayMsg(e instanceof Error ? e.message : '支付失败');
      toastError(e instanceof Error ? e.message : '支付失败');
    } finally {
      setPaying(false);
    }
  }

  async function cancelPay() {
    if (!id) return;
    setCancelling(true);
    setPayMsg('');
    stopPoll();
    try {
      await request('PARTNER_H5', `/partner/proxy-orders/${id}/cancel-pay`, {
        method: 'POST',
        body: '{}',
      });
      toastSuccess('已取消支付，可重新下单并选择其他支付方式');
      navigate('/center/proxy-orders');
    } catch (e) {
      setPayMsg(e instanceof Error ? e.message : '取消失败');
      toastError(e instanceof Error ? e.message : '取消失败');
    } finally {
      setCancelling(false);
    }
  }

  const lockedPayMethod = order?.proxyPayMethod ?? null;

  const img = order?.imageResource?.url || '';
  const isOnSite = String(order?.deliveryType || '').toUpperCase() === 'ON_SITE_PICKUP';

  return (
    <div className="page-no-tab partner-orders-page">
      <PageHeader title="代下单详情" onBack={() => navigate('/center/proxy-orders')} />

      {error && (
        <p className="partner-form-error" role="alert" style={{ margin: '16px 20px' }}>
          {error}
        </p>
      )}

      {!order && !error && <p className="label-md text-muted" style={{ margin: 20 }}>加载中…</p>}

      {order && (
        <div style={{ padding: '0 16px 32px' }}>
          <div className="partner-order-card" style={{ pointerEvents: 'none' }}>
            <div className="partner-order-card-top">
              <span className="label-md text-muted">NO. {order.orderNo}</span>
              <span
                className="label-md"
                style={{ color: proxyOrderStatusColor(order.status), fontWeight: 600 }}
              >
                {proxyOrderStatusLabel(order.status)}
              </span>
            </div>
            <div className="partner-order-product">
              <div
                className="partner-order-product-img"
                style={{
                  display: 'flex',
                  alignItems: 'center',
                  justifyContent: 'center',
                  overflow: 'hidden',
                  background: img ? `center/cover no-repeat url(${img})` : undefined,
                }}
              >
                {!img && <span className="material-symbols-outlined text-muted">liquor</span>}
              </div>
              <div style={{ flex: 1, minWidth: 0 }}>
                <h3 className="headline-md">{order.productName || '杜康好酒'}</h3>
                {order.productSpec && (
                  <p className="label-md text-muted" style={{ marginTop: 4 }}>
                    {order.productSpec}
                  </p>
                )}
                <p className="body-md" style={{ marginTop: 8 }}>
                  ×{order.quantity} · ¥{fmtMoney(Number(order.payAmount || 0))}
                </p>
                <p className="label-md text-muted" style={{ marginTop: 4 }}>
                  权益 ¥{fmtMoney(Number(order.benefitAmount || 0))}
                </p>
              </div>
            </div>
          </div>

          <section className="partner-form-card" style={{ marginTop: 12 }}>
            <h3 className="headline-md" style={{ marginBottom: 12 }}>客户信息</h3>
            <p className="body-md">姓名：{order.receiverName || '—'}</p>
            <p className="body-md" style={{ marginTop: 8 }}>手机：{order.receiverPhone || '—'}</p>
            <p className="body-md" style={{ marginTop: 8 }}>
              地址：{order.receiverAddress || (isOnSite ? '现场提货' : '—')}
            </p>
          </section>

          <section className="partner-form-card" style={{ marginTop: 12 }}>
            <h3 className="headline-md" style={{ marginBottom: 12 }}>订单信息</h3>
            <p className="body-md">配送方式：{deliveryLabel(order)}</p>
            <p className="body-md" style={{ marginTop: 8 }}>下单时间：{fmtTime(order.createdAt)}</p>
            <p className="body-md" style={{ marginTop: 8 }}>
              支付状态：{proxyOrderPayLabel(order.payStatus)}
            </p>
            <p className="body-md" style={{ marginTop: 8 }}>
              订单状态：{proxyOrderStatusLabel(order.status)}
            </p>
          </section>

          {unpaid ? (
            <section className="partner-form-card" style={{ marginTop: 12 }}>
              <h3 className="headline-md" style={{ marginBottom: 12 }}>继续支付</h3>
              <div className="partner-proxy-mode-tabs">
                <button
                  type="button"
                  className={`partner-proxy-mode-tab${payMethod === 'NATIVE' ? ' is-active' : ''}`}
                  disabled={!!lockedPayMethod && lockedPayMethod !== 'NATIVE'}
                  onClick={() => void startPay('NATIVE')}
                >
                  收款码
                </button>
                <button
                  type="button"
                  className={`partner-proxy-mode-tab${payMethod === 'JSAPI' ? ' is-active' : ''}`}
                  disabled={!!lockedPayMethod && lockedPayMethod !== 'JSAPI'}
                  onClick={() => void startPay('JSAPI')}
                >
                  微信代付
                </button>
              </div>
              {lockedPayMethod ? (
                <p className="label-md text-muted" style={{ marginTop: 8 }}>
                  已选择{lockedPayMethod === 'NATIVE' ? '收款码' : '微信代付'}，切换方式请先取消支付
                </p>
              ) : (
                <p className="label-md text-muted" style={{ marginTop: 8 }}>
                  请选择支付方式并点击下方按钮发起支付
                </p>
              )}

              {payMethod === 'NATIVE' ? (
                <div style={{ textAlign: 'center', marginTop: 16 }}>
                  {qrDataUrl ? (
                    <img src={qrDataUrl} alt="收款码" width={220} height={220} style={{ margin: '0 auto' }} />
                  ) : (
                    <p className="label-md text-muted">{paying ? '生成收款码中…' : '暂无收款码'}</p>
                  )}
                  <p className="label-md text-muted" style={{ marginTop: 8 }}>
                    请使用微信扫码支付，支付成功后自动更新
                  </p>
                  <button
                    type="button"
                    className="btn btn-block"
                    style={{ marginTop: 12 }}
                    disabled={paying}
                    onClick={() => void startPay('NATIVE')}
                  >
                    {paying ? '生成中…' : '重新生成收款码'}
                  </button>
                </div>
              ) : (
                <div style={{ marginTop: 16 }}>
                  <p className="label-md text-muted">将调起微信支付，由合伙人微信完成代付</p>
                  <button
                    type="button"
                    className="btn btn-primary btn-block"
                    style={{ marginTop: 12 }}
                    disabled={paying}
                    onClick={() => void startPay('JSAPI')}
                  >
                    {paying ? '支付中…' : '调起微信代付'}
                  </button>
                </div>
              )}

              {payMsg ? (
                <p className="partner-form-error" role="alert" style={{ marginTop: 12 }}>
                  {payMsg}
                </p>
              ) : null}

              <button
                type="button"
                className="btn btn-block"
                style={{ marginTop: 16 }}
                disabled={cancelling || paying}
                onClick={() => void cancelPay()}
              >
                {cancelling ? '取消中…' : '取消支付'}
              </button>
            </section>
          ) : null}

          {!isOnSite && order.payStatus === 'PAID' ? (
            <section className="partner-form-card" style={{ marginTop: 12 }}>
              <h3 className="headline-md" style={{ marginBottom: 12 }}>物流信息</h3>
              {trackError ? (
                <p className="label-md text-muted">{trackError}</p>
              ) : !track ? (
                <p className="label-md text-muted">加载物流…</p>
              ) : (
                <>
                  {track.trackingNo ? (
                    <p className="body-md" style={{ marginBottom: 8 }}>
                      运单号：{track.trackingNo}
                      {track.provider ? `（${track.provider}）` : ''}
                    </p>
                  ) : null}
                  {track.manualQueryUrl ? (
                    <p className="body-md" style={{ marginBottom: 8 }}>
                      <a href={track.manualQueryUrl} target="_blank" rel="noreferrer">
                        查看物流官网
                      </a>
                    </p>
                  ) : null}
                  {(track.nodes ?? []).length === 0 ? (
                    <p className="label-md text-muted">暂无物流轨迹（待总部发货后更新）</p>
                  ) : (
                    <ul style={{ paddingLeft: 18, margin: 0 }}>
                      {(track.nodes ?? []).map((n, i) => (
                        <li key={`${n.time}-${i}`} className="body-md" style={{ marginBottom: 8 }}>
                          <div className="label-md text-muted">{fmtTime(n.time)}</div>
                          <div>{n.description || n.status || '—'}</div>
                        </li>
                      ))}
                    </ul>
                  )}
                </>
              )}
            </section>
          ) : null}
        </div>
      )}
    </div>
  );
}