export type TencentPickedLocation = {
  latitude: number;
  longitude: number;
  address?: string;
  name?: string;
  cityname?: string;
};

export type LbsPlaceItem = {
  id: string;
  title: string;
  address: string;
  latitude: number;
  longitude: number;
  city?: string;
};

export function placeToPicked(item: LbsPlaceItem): TencentPickedLocation {
  return {
    latitude: item.latitude,
    longitude: item.longitude,
    address: item.address || undefined,
    name: item.title || undefined,
    cityname: item.city || undefined,
  };
}

type LocPickerMessage = {
  module?: string;
  latlng?: { lat?: number; lng?: number };
  poiaddress?: string;
  poiname?: string;
  cityname?: string;
};

const REFERER = 'dukang';

function coerceMessageData(data: unknown): LocPickerMessage | null {
  if (data == null) return null;
  if (typeof data === 'string') {
    const trimmed = data.trim();
    if (!trimmed || (trimmed[0] !== '{' && trimmed[0] !== '[')) return null;
    try {
      return JSON.parse(trimmed) as LocPickerMessage;
    } catch {
      return null;
    }
  }
  if (typeof data === 'object') return data as LocPickerMessage;
  return null;
}

/** 腾讯地图选点组件（iframe） */
export function buildTencentLocPickerUrl(
  key: string,
  options?: { latitude?: number; longitude?: number },
): string {
  const params = new URLSearchParams({
    search: '1',
    type: '1',
    key,
    referer: REFERER,
    policy: '1',
    total: '20',
    radius: '2000',
    mapdraggable: '1',
  });
  const lat = options?.latitude;
  const lng = options?.longitude;
  if (
    lat != null &&
    lng != null &&
    Number.isFinite(lat) &&
    Number.isFinite(lng) &&
    !(lat === 0 && lng === 0)
  ) {
    params.set('coord', `${lat},${lng}`);
    params.set('coordtype', '5');
  }
  return `https://apis.map.qq.com/tools/locpicker?${params.toString()}`;
}

export function parseTencentLocPickerMessage(data: unknown): TencentPickedLocation | null {
  const loc = coerceMessageData(data);
  if (!loc || loc.module !== 'locationPicker') return null;
  const lat = Number(loc.latlng?.lat);
  const lng = Number(loc.latlng?.lng);
  if (!Number.isFinite(lat) || !Number.isFinite(lng)) return null;

  let name = loc.poiname?.trim() || undefined;
  const address = loc.poiaddress?.trim() || undefined;
  if (name === '我的位置' && address) name = address;

  return {
    latitude: lat,
    longitude: lng,
    address,
    name,
    cityname: loc.cityname?.trim() || undefined,
  };
}