const md5 = require('./md5.min.js')
const key = 'BDFBZ-NXGWR-EUSWI-WGQGL-V7GSK-VSBDJ'
const sk = 'slBA3zFw9fTSjEbZKJ9hGH6DinYFqYFS'

function request(params, url){
  let keys = Object.keys(params).sort()
  let query = []
  keys.forEach(key => {
    query.push(key + '=' + params[key])
  })
  query = url + query.join('&')
  let sign = md5(query + sk)
  return new Promise(function (resolve, reject) {
    wx.request({
      url: `https://apis.map.qq.com${query}&sig=${sign}`,
      success: res => {
        if(res.statusCode == 200 && res.data && res.data.status == 0){
          resolve(res.data)
        } else {
          reject('数据错误')
        }
      },
      fail: err => {
        reject('网络异常')
      }
    })
  })
}

function geocoder(latitude, longitude){
  let params = { location: `${latitude},${longitude}`, key }
  return request(params, '/ws/geocoder/v1?')
}

/**
 * @param {*} keyword 用户输入的关键词（希望获取后续提示的关键词）必填
 * @param {*} region 限制城市范围：根据城市名称限制地域范围， 如，仅获取“广州市”范围内的提示内容
 * @param {*} latitude 定位坐标，传入后，若用户搜索关键词为类别词（如酒店、餐馆时），与此坐标距离近的地点将靠前显示，格式： location=lat,lng	
 * @param {*} longitude 定位坐标，传入后，若用户搜索关键词为类别词（如酒店、餐馆时），与此坐标距离近的地点将靠前显示，格式： location=lat,lng	
 */
function suggestion(keyword, region, location){
  let params = { keyword, region, location: `${location.latitude},${location.longitude}`, region_fix: 1, page_size: 20, get_subpois: 0, key }
  return request(params, '/ws/place/v1/suggestion?')
}

//https://apis.map.qq.com/ws/place/v1/explore
function explore(location, radius, num, size){
  let params = { boundary: `nearby(${location.latitude},${location.longitude},${radius})`, page_index: num, page_size: size, key }
  return request(params, '/ws/place/v1/explore?')
}
//骑行（bicycling）路线规划
function bicycling(from, to){
  let params = { from: `${from.latitude},${from.longitude}`, to: `${to.latitude},${to.longitude}`, key }
  return request(params, '/ws/direction/v1/bicycling?')
}
// 步行（walking）路线规划
function walking(from, to){
  let params = { from: `${from.latitude},${from.longitude}`, to: `${to.latitude},${to.longitude}`, key }
  return request(params, '/ws/direction/v1/walking?')
}
// 驾车（driving）路线规划;waypoints:途经点，格式：lat1,lng1;lat2,lng2;… 最大支持16个>>waypoints=39.951004,116.571980
function driving(from, to, waypoints){
  let params = { from: `${from.latitude},${from.longitude}`, to: `${to.latitude},${to.longitude}`, key }
  if(waypoints && Array.isArray(waypoints)){
    var points = ''
    for (let index = 0; index < waypoints.length; index++) {
      if(index == 0){
        points += waypoints[index].latitude + ',' + waypoints[index].longitude
      } else {
        points += ';' + waypoints[index].latitude + ',' + waypoints[index].longitude
      }
      params.waypoints = points
    }
  }
  return request(params, '/ws/direction/v1/driving?')
}

module.exports = {
  key: key,
  geocoder: geocoder,
  suggestion: suggestion,
  explore: explore,
  bicycling: bicycling,
  walking: walking,
  driving: driving
}