import { useEffect, useState } from 'react';
import { View, Text, Button } from '@tarojs/components';
import { useRouter } from '@tarojs/taro';
import HqHeader from '../../components/HqHeader';
import { request, toast } from '../../lib/api';
import { ORDER_STATUS_LABELS, badgeClass, fmtMoney, fmtTime } from '../../lib/constants';

type StatusLog = { fromStatus?: string; toStatus?: string; createdAt: string };
type OrderDetail = {
  id: string;
  orderNo: string;
  status: string;
  payAmount: number | string;
  totalAmount?: number | string;
  quantity?: number;
  receiverName?: string;
  receiverPhone?: string;
  receiverAddress?: string;
  createdAt: string;
  product?: { name: string; skuCode: string };
  city?: { name: string };
  delivery?: { provider?: string; trackingNo?: string } | null;
  statusLogs?: StatusLog[];
};

const NEXT: Record<string, Array<{ status: string; label: string }>> = {
  PENDING_SHIP: [{ status: 'OUT_WAREHOUSE', label: '标记出库' }],
  OUT_WAREHOUSE: [{ status: 'SHIPPING', label: '标记配送中' }],
  SHIPPING: [{ status: 'PENDING_RECEIVE', label: '标记待收货' }],
  PENDING_RECEIVE: [{ status: 'COMPLETED', label: '标记已完成' }],
};

export default function OrderDetailPage() {
  const router = useRouter();
  const id = router.params.id;
  const [order, setOrder] = useState<OrderDetail | null>(null);
  const [saving, setSaving] = useState(false);

  function load() {
    if (!id) return;
    request<OrderDetail>(`/admin/orders/${id}`).then(setOrder).catch(() => undefined);
  }

  useEffect(load, [id]);

  async function transition(status: string) {
    if (!id || saving) return;
    setSaving(true);
    try {
      const d = await request<OrderDetail>(`/admin/orders/${id}/status`, { method: 'PUT', data: { status } });
      setOrder(d);
      toast('订单状态已更新', 'success');
    } catch (e) {
      toast(e instanceof Error ? e.message : '操作失败');
    } finally {
      setSaving(false);
    }
  }

  const actions = order ? NEXT[order.status] ?? [] : [];

  return (
    <View className="hq-page" style={actions.length ? 'padding-bottom:calc(96px + var(--hq-safe-bottom))' : ''}>
      <HqHeader title="订单详情" back />

      {!order && <View className="hq-empty">加载中…</View>}

      {order && (
        <>
          <View className="hq-card">
            <View className="hq-row">
              <Text style="font-size:13px;color:var(--hq-muted)">{order.orderNo}</Text>
              <Text className={`hq-badge ${badgeClass(order.status)}`}>
                {ORDER_STATUS_LABELS[order.status] || order.status}
              </Text>
            </View>
            <Text style="display:block;margin-top:12px;font-size:15px;font-weight:600">{order.product?.name || '—'}</Text>
            <Text className="hq-muted" style="font-size:12px">SKU {order.product?.skuCode || '—'} · 数量 {order.quantity ?? 1}</Text>
            <View className="hq-row" style="margin-top:12px">
              <Text className="hq-muted" style="font-size:13px">实付金额</Text>
              <Text style="font-size:18px;font-weight:700;color:var(--hq-red)">¥{fmtMoney(order.payAmount)}</Text>
            </View>
          </View>

          <View className="hq-card">
            <View className="hq-row" style="margin-bottom:8px">
              <Text className="hq-muted" style="font-size:13px">收货人</Text>
              <Text style="font-size:14px">{order.receiverName || '—'} {order.receiverPhone || ''}</Text>
            </View>
            <View className="hq-row" style="margin-bottom:8px">
              <Text className="hq-muted" style="font-size:13px">收货地址</Text>
              <Text style="font-size:14px;text-align:right;max-width:60%">{order.receiverAddress || '—'}</Text>
            </View>
            <View className="hq-row" style="margin-bottom:8px">
              <Text className="hq-muted" style="font-size:13px">所属城市</Text>
              <Text style="font-size:14px">{order.city?.name || '—'}</Text>
            </View>
            <View className="hq-row">
              <Text className="hq-muted" style="font-size:13px">物流</Text>
              <Text style="font-size:14px">{order.delivery?.provider || '—'} {order.delivery?.trackingNo || ''}</Text>
            </View>
          </View>

          <Text className="hq-section-title">状态流转</Text>
          <View className="hq-card">
            {(order.statusLogs ?? []).length === 0 && <Text className="hq-muted">暂无记录</Text>}
            {(order.statusLogs ?? []).map((log, i) => (
              <View key={i} className="hq-row" style="padding:8px 0;border-bottom:1px solid var(--hq-line)">
                <Text style="font-size:13px">
                  {ORDER_STATUS_LABELS[log.toStatus || ''] || log.toStatus}
                </Text>
                <Text className="hq-muted" style="font-size:12px">{fmtTime(log.createdAt)}</Text>
              </View>
            ))}
          </View>

          {actions.length > 0 && (
            <View className="hq-footer-bar">
              {actions.map((a) => (
                <Button
                  key={a.status}
                  className="hq-btn hq-btn--primary hq-btn--block"
                  disabled={saving}
                  onClick={() => transition(a.status)}
                >
                  {a.label}
                </Button>
              ))}
            </View>
          )}
        </>
      )}
    </View>
  );
}