/**
 * 地图配置
 * 腾讯地图开放平台: https://lbs.qq.com/
 * 高德地图开放平台: https://lbs.amap.com/
 */

// 腾讯地图配置
export const TENCENT_MAP = {
  // 腾讯地图Key
  key: 'Q7CBZ-CC2C5-5O6IA-IU5VM-KJGAF-IKBRO',
  
  // API地址
  geocoderUrl: 'https://apis.map.qq.com/ws/geocoder/v1/', // 逆地理编码
  directionUrl: 'https://apis.map.qq.com/ws/direction/v1/', // 路线规划
}

// 高德地图配置（备用）
export const AMAP = {
  key: 'YOUR_AMAP_KEY',
  geocoderUrl: 'https://restapi.amap.com/v3/geocode/regeo'
}

/**
 * 逆地理编码 - 将经纬度转换为地址
 * @param {Number} latitude 纬度
 * @param {Number} longitude 经度
 * @returns {Promise<String>} 详细地址
 */
export async function reverseGeocode(latitude, longitude) {
  try {
    const res = await uni.request({
      url: TENCENT_MAP.geocoderUrl,
      method: 'GET',
      data: {
        location: `${latitude},${longitude}`,
        key: TENCENT_MAP.key,
        get_poi: 0 // 不返回周边POI列表
      }
    })
    
    if (res.statusCode === 200 && res.data.status === 0) {
      const result = res.data.result
      const addressComponent = result.address_component
      
      // 拼接详细地址：省 + 市 + 区 + 街道 + 门牌号
      const detailAddress = [
        addressComponent.province,
        addressComponent.city,
        addressComponent.district,
        addressComponent.street,
        addressComponent.street_number
      ].filter(item => item).join('')
      
      return {
        success: true,
        address: detailAddress,
        province: addressComponent.province,
        city: addressComponent.city,
        district: addressComponent.district,
        street: addressComponent.street,
        streetNumber: addressComponent.street_number,
        formattedAddress: result.formatted_addresses?.recommend || detailAddress
      }
    } else {
      console.warn('逆地理编码失败:', res.data)
      return {
        success: false,
        address: `位置: ${latitude.toFixed(6)}, ${longitude.toFixed(6)}`,
        error: res.data.message || '获取地址失败'
      }
    }
  } catch (e) {
    console.error('逆地理编码异常:', e)
    return {
      success: false,
      address: `位置: ${latitude.toFixed(6)}, ${longitude.toFixed(6)}`,
      error: e.message || '网络异常'
    }
  }
}

/**
 * 计算两点之间的距离（米）
 * @param {Number} lat1 纬度1
 * @param {Number} lng1 经度1
 * @param {Number} lat2 纬度2
 * @param {Number} lng2 经度2
 * @returns {Number} 距离（米）
 */
export function calculateDistance(lat1, lng1, lat2, lng2) {
  const rad = (d) => d * Math.PI / 180.0
  const EARTH_RADIUS = 6378137.0
  
  const radLat1 = rad(lat1)
  const radLat2 = rad(lat2)
  const a = radLat1 - radLat2
  const b = rad(lng1) - rad(lng2)
  
  let s = 2 * Math.asin(Math.sqrt(
    Math.pow(Math.sin(a / 2), 2) +
    Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)
  ))
  s = s * EARTH_RADIUS
  s = Math.round(s)
  
  return s
}