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const http = require('http')
const https = require('https')
const api = require('./api.json')

//  Print out temp details
function printWeather (weather) {
  const message = `Current temperature in ${weather.location.city} is ${weather.current_observation.temp_c}C`
  console.log(message)
}
//  Print out error message
function printError (error) {
  console.error(error.message)
}

function get (query) {
  //  為了閱讀舒適度，把底線拿掉
  const readableQuery = query.replace('_', ' ')
  //  如果一個錯誤的 URL 傳進來會立即被捕捉

  try {
    const request = https.get(`https://api.wunderground.com/api/${api.key}/geolookup/conditions/q/${query}.json`,
      response => {
        if (response.statusCode === 200) {
          let body = ''
          //  Read the data
          response.on('data', chunk => {
            body += chunk
          })
          response.on('end', () => {
            try {
              //  parse data
              const weather = JSON.parse(body)
              //  列印資料前看看該地點是否存在
              if (weather.location) {
                //  print data
                printWeather(weather)
              } else {
                const queryError = new Error(`The location "${readableQuery}" was not found.`)
                printError(queryError)
              }
            } catch (error) {
              //  Parse Error
              printError(error)
            }
          })
        } else {
          //  狀態錯誤（Status Code Error）
          const statusCodeError = new Error(`There was an error getting the message for ${readableQuery}. (${http.STATUS_CODES[response.statusCode]})`)
          printError(statusCodeError)
        }
      })

    request.on('error', error => {
      printError(error)
    })
  } catch (error) {
    //  錯誤的 URL 格式
    printError(error)
  }
}

module.exports.get = get

const weather = require('./weather')
//  將所有的參數（陣列）以底線合併成字串，並將所有的空格用底線取代
const query = process.argv.slice(2).join('_').replace(' ', '_')

weather.get(query)

{
  "key": "<apikey>"
}