import { useCallback, useState } from 'react';
import { View, Text } from '@tarojs/components';
import '../../styles/address.css';
import Taro, { useDidShow, usePullDownRefresh, useRouter } from '@tarojs/taro';
import PageShell from '../../components/PageShell';
import SubPageHeader from '../../components/SubPageHeader';
import {
  buildAddressEditUrl,
  buildOrderConfirmUrl,
  readCheckoutContext,
} from '../../lib/checkout-nav';
import { isDirtyShippingAddress } from '../../lib/shipping-address';
import { request, toast } from '../../lib/api';

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

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

export default function AddressesPage() {
  const router = useRouter();
  const checkoutCtx = readCheckoutContext(router.params);
  const selectMode = checkoutCtx.select === true;
  const [list, setList] = useState<Address[]>([]);
  const [loading, setLoading] = useState(true);

  const loadList = useCallback(() => {
    setLoading(true);
    request<Address[]>('/user/addresses')
      .then((data) => setList(Array.isArray(data) ? data : []))
      .catch(() => setList([]))
      .finally(() => setLoading(false));
  }, []);

  useDidShow(() => {
    loadList();
  });

  usePullDownRefresh(() => {
    void Promise.resolve(loadList()).finally(() => Taro.stopPullDownRefresh());
  });

  function selectAddress(addr: Address) {
    if (!selectMode) return;
    if (isDirtyShippingAddress(addr)) {
      toast('该地址缺少具体区县，请先完善');
      Taro.navigateTo({ url: buildAddressEditUrl(addr.id, checkoutCtx) }).catch(() => {});
      return;
    }
    Taro.redirectTo({
      url: buildOrderConfirmUrl({
        productId: checkoutCtx.productId,
        qty: checkoutCtx.qty,
        addressId: addr.id,
        cross: checkoutCtx.cross,
      }),
    });
  }

  async function removeAddress(id: string) {
    const res = await Taro.showModal({
      title: '删除地址',
      content: '确定删除该收货地址吗？',
    });
    if (!res.confirm) return;
    try {
      await request(`/user/addresses/${id}`, { method: 'DELETE' });
      toast('已删除', 'success');
      loadList();
    } catch (e) {
      toast(e instanceof Error ? e.message : '删除失败');
    }
  }

  const sorted = [...list].sort((a, b) => {
    const da = isDirtyShippingAddress(a) ? 0 : 1;
    const db = isDirtyShippingAddress(b) ? 0 : 1;
    return da - db;
  });

  return (
    <PageShell variant="sub" className="address-page" hasFixedFooter>
      <SubPageHeader title={selectMode ? '选择收货地址' : '地址管理'} />
      <View className="sub-page-body" style={{ paddingBottom: 80 }}>
        {loading ? <View className="u-empty">加载中…</View> : null}
        {!loading && list.length === 0 ? (
          <View className="u-empty">暂无收货地址</View>
        ) : null}
        {sorted.map((a) => {
          const dirty = isDirtyShippingAddress(a);
          return (
            <View
              key={a.id}
              className={`address-item${dirty ? ' address-item--dirty' : ''}`}
              onClick={() => selectAddress(a)}
            >
              <View className="address-item-head">
                <Text className="address-item-name">{a.receiverName}</Text>
                <Text className="address-item-phone">{a.phone}</Text>
                {dirty ? <Text className="address-need-fix-tag">需完善</Text> : null}
                {a.isDefault === 1 || a.isDefault === true ? (
                  <Text className="address-default-tag">默认</Text>
                ) : null}
              </View>
              <Text className="address-item-detail">{formatAddress(a)}</Text>
              {dirty ? (
                <Text className="address-item-warn">缺少具体区县，同城配送可能失败，请编辑完善</Text>
              ) : null}
              {!selectMode || dirty ? (
                <View className="address-item-actions">
                  <Text
                    className="address-action"
                    onClick={(e) => {
                      e.stopPropagation();
                      Taro.navigateTo({ url: buildAddressEditUrl(a.id, checkoutCtx) }).catch((err) => {
                        toast(err instanceof Error ? err.message : '无法打开编辑页');
                      });
                    }}
                  >
                    {dirty ? '去完善' : '编辑'}
                  </Text>
                  {!selectMode ? (
                    <Text
                      className="address-action"
                      onClick={(e) => {
                        e.stopPropagation();
                        void removeAddress(a.id);
                      }}
                    >
                      删除
                    </Text>
                  ) : null}
                </View>
              ) : null}
            </View>
          );
        })}
      </View>
      <View
        className="address-fab"
        onClick={() => {
          Taro.navigateTo({ url: buildAddressEditUrl(undefined, checkoutCtx) }).catch((e) => {
            toast(e instanceof Error ? e.message : '无法打开新增地址页');
          });
        }}
      >
        <Text>新增地址</Text>
      </View>
    </PageShell>
  );
}