Tracks changes in UW Madison Hoofer Sailing Club lake conditions flag. Flag status is saved in a google sheets to display the history later. Visit site at: https://elza.me/hooferflag

hooferflag.gs

function fetchData() {
  // Fetch data
  //var url = 'http://testout.hoofersailing.org/feed.php'
  //var url = 'https://ehs.wisc.edu/current-flag.php'
  var url = 'https://endpoints.wams.doit.wisc.edu/ehs.wisc.edu/LakeConditions/Api/'
  var response = UrlFetchApp.fetch(url, {'muteHttpExceptions': true});

  // Process response to object
  var json = response.getContentText().replace(/\(|\)|;/g, '');
  var data = JSON.parse(json);
  
  // Return the flag color and date updated
  return {
    retrieved: data.Retrieved.substring(0,19).replace('T', ' '),
    foundBuoy: data.FoundBuoy,
    foundFlag: data.FoundFlag,
    foundWeather: data.FoundWeather,
    waterTemp: data.WaterTemp,
    flag: data.Flag,
    sunset: data.SunsetHour + "." + data.SunsetMinute,
    windDir: data.WindDir,
    windDegrees: data.WindDegrees,
    windMph: data.WindMph,
    //wind: data.WindMph + "mph " + data.WindDir + " (" + data.WindDegrees + "°)",
    tempF: data.TempF,
    tempC: data.TempC,
    forecast: data.Forecast,
    forecastIcon: data.ForecastIcon
    //temp: data.TempF + "°F (" + data.TempC + "°C)"
  };
};

function isNewFlag (flagHistorySpreadsheetId,data) {
  // Get sheet
  var ss = SpreadsheetApp.openById(flagHistorySpreadsheetId);
  var sheet = ss.getSheets()[0]
  
  // Get last recorded flag
  var lastRow = sheet.getLastRow();
  var lastFlag = sheet.getRange(lastRow,2).getValue();
  
  // Return true if flag has change, false if not
  return data.flag!=lastFlag ? true:false;
};

function writeFlagToLog(flagHistorySpreadsheetId,data) {
  // Get sheet
  var ss = SpreadsheetApp.openById(flagHistorySpreadsheetId);
  var sheet = ss.getSheets()[0]
  
  // Add new data to sheet
//  var t = new Date( parseInt(data.retrieved) );
//  var formatted = t.toISOString().replace(/T/g, ' ').slice(0,-5);
  
//  sheet.appendRow([Date.now(), data.flag, formatted, data.foundBuoy, data.foundFlag, data.foundWeather, 
//                   data.waterTemp, data.sunset, data.windDir, data.windDegrees, data.windMph, data.tempF, 
//                   data.tempC, data.forecast, data.forecastIcon]);
  sheet.appendRow([Date.now(), data.flag, data.retrieved, data.foundBuoy, data.foundFlag, data.foundWeather, 
                   data.waterTemp, data.sunset, data.windDir, data.windDegrees, data.windMph, data.tempF, 
                   data.tempC, data.forecast, data.forecastIcon]);
};

function sendNotifications(subscriptionSpreadsheetId,data) {
  // Get sheet
  var ss = SpreadsheetApp.openById(subscriptionSpreadsheetId);
  var sheet = ss.getSheets()[1]
  
  // Get subscriptions
  var subs = sheet.getDataRange().getValues().join();
  if (subs == '#N/A') {return}
  
  // Prep message
  var fro = 'Hoofer Flag Subs<notify.hayden.elza@gmail.com>';
  var msg = data.flag!='None' ? data.flag+' flag is now in effect':'Lifesaving Station is Closed';
  
  // Send email
  GmailApp.sendEmail(fro, msg, '', {
    bcc: subs,
    name: 'Hoofer Flag Update'
  });
};

function main() {
  var flagHistorySpreadsheetId = '1gtrfO23I4Ph_byR8x0QiJi1QmyFofVsK5LuAE-6TF1A';
  var subscriptionSpreadsheetId = '1J7z9Ra7fKtiwzxxd1Rkj2u5E9tC2vkqyCJqo5auDKRo';
  
  var data = fetchData();
  if(isNewFlag(flagHistorySpreadsheetId,data)) {
    writeFlagToLog(flagHistorySpreadsheetId,data);
    sendNotifications(subscriptionSpreadsheetId,data);
  }
};