import { useCallback, useEffect, useState } from 'react';
import { Link, useNavigate, useSearchParams } from 'react-router-dom';
import SubPageHeader from '../components/SubPageHeader';
import { request } from '../lib/api';
import { useUserSession } from '../contexts/UserSessionContext';
import { buildAddressEditUrl, buildAddressListUrl, buildOrderConfirmUrl, hasCheckoutContext, readCheckoutContext } from '../lib/navigation';
import { usePageView } from '../lib/usePageView';

type Address = {
  id: string;
  receiverName: string;
  phone: string;
  province: string;
  city: string;
  district: string;
  detail: string;
  isDefault?: number;
};

function maskPhone(phone: string) {
  return phone.replace(/(\d{3})\d{4}(\d{4})/, '$1****$2');
}

function formatAddress(a: Address) {
  return `${a.province}${a.city}${a.district}${a.detail}`;
}

export default function AddressListPage() {
  usePageView('address_list_view');
  const { profile } = useUserSession();
  const [list, setList] = useState<Address[]>([]);
  const [pendingAddress, setPendingAddress] = useState<Address | null>(null);
  const [savingOrderAddress, setSavingOrderAddress] = useState(false);
  const [params] = useSearchParams();
  const navigate = useNavigate();
  const selectMode = params.get('select') === '1';
  const orderId = params.get('orderId') || '';
  const productId = params.get('productId') || '';
  const qty = params.get('qty') || '';
  const cross = params.get('cross') === '1';
  const currentAddressId = params.get('addressId') || '';

  const loadList = useCallback(() => {
    request<Address[]>('USER_H5', '/user/addresses').then(setList);
  }, []);

  useEffect(() => {
    loadList();
  }, [loadList, profile?.id]);

  function selectAddress(addr: Address) {
    if (!selectMode) return;
    if (orderId) {
      setPendingAddress(addr);
      return;
    }
    const qs = new URLSearchParams();
    if (productId) qs.set('productId', productId);
    if (qty) qs.set('qty', qty);
    if (cross) qs.set('cross', '1');
    qs.set('addressId', addr.id);
    navigate(`/order/confirm?${qs.toString()}`);
  }

  async function confirmOrderAddress() {
    if (!orderId || !pendingAddress) return;
    setSavingOrderAddress(true);
    try {
      await request('USER_H5', `/trade/orders/${orderId}/address`, {
        method: 'PUT',
        body: JSON.stringify({
          receiverName: pendingAddress.receiverName,
          receiverPhone: pendingAddress.phone,
          receiverProvince: pendingAddress.province,
          receiverCity: pendingAddress.city,
          receiverDistrict: pendingAddress.district,
          receiverAddress: `${pendingAddress.province}${pendingAddress.city}${pendingAddress.district}${pendingAddress.detail}`,
        }),
      });
      navigate(`/orders/${orderId}`);
    } catch (e) {
      window.alert(e instanceof Error ? e.message : '修改地址失败');
    } finally {
      setSavingOrderAddress(false);
      setPendingAddress(null);
    }
  }

  async function setDefault(addr: Address, e: React.MouseEvent) {
    e.stopPropagation();
    if (addr.isDefault === 1) return;
    await request('USER_H5', `/user/addresses/${addr.id}`, {
      method: 'PUT',
      body: JSON.stringify({
        receiverName: addr.receiverName,
        phone: addr.phone,
        province: addr.province,
        city: addr.city,
        district: addr.district,
        detail: addr.detail,
        isDefault: true,
      }),
    });
    loadList();
  }

  async function removeAddress(id: string, e: React.MouseEvent) {
    e.stopPropagation();
    if (!window.confirm('确定删除该收货地址吗？')) return;
    await request('USER_H5', `/user/addresses/${id}`, { method: 'DELETE' });
    loadList();
  }

  const checkoutCtx = readCheckoutContext(params);

  function goEdit(id: string, e: React.MouseEvent) {
    e.stopPropagation();
    navigate(buildAddressEditUrl(id, checkoutCtx));
  }

  function goBack() {
    if (orderId) {
      navigate(`/orders/${orderId}`);
      return;
    }
    if (hasCheckoutContext(checkoutCtx)) {
      navigate(buildOrderConfirmUrl(checkoutCtx));
      return;
    }
    navigate('/mine');
  }

  return (
    <div className="address-list-page">
      <SubPageHeader title={orderId ? '选择收货地址' : '我的地址'} onBack={goBack} />

      <main className="address-list-main sub-page-body">
        {list.length === 0 && (
          <p className="address-list-empty">暂无收货地址，请新增</p>
        )}

        <div className="address-list-cards">
          {list.map((a) => {
            const isDefault = Number(a.isDefault) === 1;
            const isSelected = selectMode && currentAddressId === String(a.id);
            return (
              <article
                key={a.id}
                className={`address-list-card${isDefault ? ' is-default' : ''}${isSelected ? ' is-selected' : ''}${selectMode ? ' is-selectable' : ''}`}
                onClick={() => selectAddress(a)}
                onKeyDown={(e) => {
                  if (e.key === 'Enter' || e.key === ' ') {
                    e.preventDefault();
                    selectAddress(a);
                  }
                }}
                role={selectMode ? 'button' : undefined}
                tabIndex={selectMode ? 0 : undefined}
              >
                <div className="address-list-card-head">
                  <div className="address-list-card-contact">
                    <span className="address-list-name">{a.receiverName}</span>
                    <span className="address-list-phone">{maskPhone(a.phone)}</span>
                  </div>
                  {isDefault && <span className="address-list-default-badge">默认</span>}
                </div>

                <p className="address-list-detail">{formatAddress(a)}</p>

                <div className="address-list-divider" />

                <div className="address-list-actions">
                  {isDefault ? (
                    <div className="address-list-default-label">
                      <span className="material-symbols-outlined fill-icon">check_circle</span>
                      <span>默认地址</span>
                    </div>
                  ) : (
                    <button
                      type="button"
                      className="address-list-set-default"
                      onClick={(e) => setDefault(a, e)}
                    >
                      <span className="material-symbols-outlined">radio_button_unchecked</span>
                      <span>设为默认</span>
                    </button>
                  )}

                  <div className="address-list-action-btns">
                    <button type="button" className="address-list-action-btn" onClick={(e) => goEdit(String(a.id), e)}>
                      <span className="material-symbols-outlined">edit</span>
                      <span>编辑</span>
                    </button>
                    <button
                      type="button"
                      className="address-list-action-btn"
                      onClick={(e) => removeAddress(String(a.id), e)}
                    >
                      <span className="material-symbols-outlined">delete</span>
                      <span>删除</span>
                    </button>
                  </div>
                </div>
              </article>
            );
          })}
        </div>

        {list.length > 0 && (
          <div className="address-list-brand" aria-hidden>
            <div className="address-list-brand-icon">
              <span className="material-symbols-outlined">location_on</span>
            </div>
            <p>DUKANG HERITAGE SERVICE</p>
          </div>
        )}
      </main>

      <footer className="address-list-footer">
        <Link
          to={buildAddressEditUrl('new', checkoutCtx)}
          className="address-list-add-btn"
          onClick={(e) => e.stopPropagation()}
        >
          <span className="material-symbols-outlined">add</span>
          <span>新增收货地址</span>
        </Link>
      </footer>

      {pendingAddress && (
        <div className="order-address-modal-overlay" onClick={() => setPendingAddress(null)}>
          <div className="order-address-modal" onClick={(e) => e.stopPropagation()}>
            <div className="order-address-modal-head">
              <span className="material-symbols-outlined">location_on</span>
              <h3>修改收货地址</h3>
            </div>
            <div className="order-address-modal-body">
              <p>确认将订单收货地址修改为：</p>
              <p className="order-address-modal-target">
                {pendingAddress.receiverName} {maskPhone(pendingAddress.phone)}
                <br />
                {formatAddress(pendingAddress)}
              </p>
            </div>
            <div className="order-address-modal-actions">
              <button type="button" onClick={() => setPendingAddress(null)}>
                取消
              </button>
              <button
                type="button"
                className="primary"
                disabled={savingOrderAddress}
                onClick={confirmOrderAddress}
              >
                {savingOrderAddress ? '保存中...' : '确认修改'}
              </button>
            </div>
          </div>
        </div>
      )}
    </div>
  );
}