function installTrigger() {
  ScriptApp.newTrigger('onFormSubmit')
      .forSpreadsheet(SpreadsheetApp.getActive())
      .onFormSubmit()
      .create();
}

const fakeSubmission = {"authMode":"FULL","namedValues":{"Your Name":["Claire"],"GitHub username":["clairefro"],"Timestamp":["9/20/2021 9:55:20"]},"range":{"columnEnd":3,"columnStart":1,"rowEnd":3,"rowStart":3},"source":{},"triggerUid":"3209236967361824985","values":["9/20/2021 9:55:20","Claire","clairefro"]}

function testSubmission() {
  onFormSubmit(fakeSubmission)
}

const AVATAR_URL_COL = 4
const LOCATION_COL = 5
const FOLLOWERS_COL = 6
const PUBLIC_REPOS_COL = 7


function onFormSubmit(e) {
  // get username
  const responses = e.namedValues

  const username = responses["GitHub username"][0]
  const { rowStart } = e.range

  
  // fetch user data from github
  const options = {
      method: "GET",
      contentType: "application/json",
      muteHttpExceptions: true 
    };
  try {
    const url = `https://api.github.com/users/${username}`;
    const response = UrlFetchApp.fetch(url/*, options*/);
    // if(response.getResponseCode() > 299)  throw new Error(`GitHub responded with code: ${response.getResponseCode()}`)
  
    const parsedResponse = JSON.parse(response)
  
    // write data to sheet
    const { avatar_url, location, followers, public_repos } = parsedResponse
    writeCell(rowStart, AVATAR_URL_COL, avatar_url)
    writeCell(rowStart, LOCATION_COL, location)
    writeCell(rowStart, FOLLOWERS_COL, followers)
    writeCell(rowStart, PUBLIC_REPOS_COL, public_repos)
  } catch(err) {
    Logger.log(err.message || err)
    writeCell(rowStart, AVATAR_URL_COL, "ERROR")
    writeCell(rowStart, LOCATION_COL, "ERROR")
    writeCell(rowStart, FOLLOWERS_COL, "ERROR")
    writeCell(rowStart, PUBLIC_REPOS_COL, "ERROR")
  }
}

function writeCell(row, col, val) {
  const ss = SpreadsheetApp.getActive();
  const s = ss.getSheets()[0]
  s.getRange(row, col).setValue(val)
}