/** 地点搜索 v5/place/text 使用的「Web 服务」类型 Key */
export const AMAP_WEB_SERVICE_KEY = 'b43016a0d1f5b0c32211560392059708';

/**
 * 高德地点关键词搜索（Web 服务 v5）。
 * @see https://restapi.amap.com/v5/place/text
 * @param {string} keyword 地点关键字
 * @param {{ key?: string, pageSize?: number, pageNum?: number, region?: string, cityLimit?: boolean }} options
 * @returns {Promise<Array>}
 */
export function searchAmapPlaceText(keyword, options = {}) {
  const key = options.key || AMAP_WEB_SERVICE_KEY;
  const pageSize = options.pageSize || 20;
  const pageNum = options.pageNum || 1;
  if (!key) {
    return Promise.reject(new Error('高德地图 Key 未配置'));
  }
  const trimmed = String(keyword || '').trim();
  if (!trimmed) {
    return Promise.reject(new Error('请输入地址关键词'));
  }

  const params = new URLSearchParams({
    key,
    keywords: trimmed,
    page_size: String(pageSize),
    page_num: String(pageNum),
    show_fields: 'photos',
  });
  if (options.region) {
    params.set('region', options.region);
  }
  if (options.cityLimit != null) {
    params.set('city_limit', options.cityLimit ? 'true' : 'false');
  }

  return fetch(`https://restapi.amap.com/v5/place/text?${params.toString()}`)
    .then(response => {
      if (!response.ok) {
        throw new Error('高德地点搜索请求失败');
      }
      return response.json();
    })
    .then(data => {
      if (String(data?.status) === '1') {
        return Array.isArray(data.pois) ? data.pois : [];
      }
      const error = new Error(data?.info || '高德地点搜索失败');
      error.code = data?.infocode;
      throw error;
    });
}

/**
 * 将高德 Geocoder / place/text 结果规范化为地图选址浮层列表数据。
 * @param {Array|Object} geocodesOrResult geocodes/pois 数组，或含 geocodes/pois/location 的结果对象
 * @param {string} keyword 搜索关键词兜底文案
 * @returns {Array<{id: string|number, name: string, address: string, location: any, photo: string}>}
 */
export function normalizeMapSearchResults(geocodesOrResult, keyword = '') {
  const fallback = String(keyword || '').trim();
  let list = [];
  if (Array.isArray(geocodesOrResult)) {
    list = geocodesOrResult;
  } else if (geocodesOrResult && typeof geocodesOrResult === 'object') {
    if (Array.isArray(geocodesOrResult.pois)) {
      list = geocodesOrResult.pois;
    } else if (Array.isArray(geocodesOrResult.geocodes)) {
      list = geocodesOrResult.geocodes;
    } else if (geocodesOrResult.location) {
      list = [geocodesOrResult];
    }
  }

  return list
    .map((item, index) => {
      if (!item) return null;
      if (isPlacePoi(item)) {
        const address = buildPoiAddress(item) || fallback || '-';
        return {
          id: item.id || index,
          name: String(item.name || '').trim() || address,
          address,
          location: parseMapLocation(item.location),
          photo: pickPoiPhoto(item),
        };
      }

      const buildingName = pickNamedField(item?.building);
      const neighborhoodName = pickNamedField(item?.neighborhood);
      const address = item?.formattedAddress || item?.address || fallback || '-';
      return {
        id: item?.id || index,
        name: buildingName || neighborhoodName || address,
        address,
        location: parseMapLocation(item?.location),
        photo: item?.photo || item?.image || '',
      };
    })
    .filter(item => item && item.location);
}

export function parseMapLocation(location) {
  if (!location) return null;
  if (typeof location.getLng === 'function' && typeof location.getLat === 'function') {
    return location;
  }
  if (typeof location === 'string') {
    const parts = location.split(',');
    const lng = Number(parts[0]);
    const lat = Number(parts[1]);
    if (!Number.isFinite(lng) || !Number.isFinite(lat)) return null;
    return { lng, lat };
  }
  if (Number.isFinite(Number(location.lng)) && Number.isFinite(Number(location.lat))) {
    return { lng: Number(location.lng), lat: Number(location.lat) };
  }
  if (
    Number.isFinite(Number(location.longitude)) &&
    Number.isFinite(Number(location.latitude))
  ) {
    return { lng: Number(location.longitude), lat: Number(location.latitude) };
  }
  return null;
}

function isPlacePoi(item) {
  return Boolean(item && item.name && item.location && (item.id || item.typecode || item.adname));
}

function buildPoiAddress(item) {
  const detail = String(item.address || '').trim();
  const region = [item.pname, item.cityname, item.adname]
    .map(value => String(value || '').trim())
    .filter(Boolean);
  // 直辖市等场景省市名可能重复
  const uniqueRegion = region.filter((value, index) => region.indexOf(value) === index);
  const prefix = uniqueRegion.join('');
  if (prefix && detail) {
    if (detail.startsWith(prefix)) return detail;
    return `${prefix}${detail}`;
  }
  return detail || prefix || String(item.name || '').trim();
}

function pickPoiPhoto(item) {
  const photos = item?.photos;
  if (Array.isArray(photos) && photos.length) {
    return photos[0]?.url || '';
  }
  if (photos && typeof photos === 'object') {
    return photos.url || '';
  }
  return item?.photo || item?.image || '';
}

function pickNamedField(value) {
  if (!value) return '';
  if (typeof value === 'string') return value.trim();
  if (typeof value === 'object' && value.name) return String(value.name).trim();
  return '';
}