Date, Get Day of Week String

// GraalJS Script (engine type: 2)

//////// START "main()" /////////////////////////////////////////////////////////////////
main();
function main(){ 

const strDayFormat    = configs.get( "StrConfA" );        /// REQUIRED /////////////
  if( strDayFormat  === "" ){
    throw new Error( "\n AutomatedTask ConfigError:" +
                     " Config {A: Day Format} is empty \n" );
  }
const strTarget       = configs.get( "StrConfB" );        /// REQUIRED /////////////
  if( strTarget     === "" ){
    throw new Error( "\n AutomatedTask ConfigError:" +
                     " Config {B: Date or Datetime} is empty \n" );
  }
  let dateTarget      = parseDateAsMidnight( strTarget ); // the first of the date
  engine.log( " AutomatedTask ConfigLog:" +
              " DayOfWeek of " + strTarget + " (Sun=0,Mon=1): " + dateTarget.getDay() );
const strPocketOutput = configs.getObject( "SelectConfC" ); /// REQUIRED ///////////


//// == Data Retrieving / ワークフローデータの参照 ==
// (Nothing. Retrieved via Expression Language in Config Retrieving)


//// == Calculating / 演算 ==
let arrDayFormat = strDayFormat.split(",");
let numDayId = dateTarget.getDay();


//// == Data Updating / ワークフローデータへの代入 ==
engine.setData( strPocketOutput, arrDayFormat[ numDayId ] );


} //////// END "main()" /////////////////////////////////////////////////////////////////


function parseDateAsMidnight( str ) { // Transform date from String to Date
  if( str === "" ){
    throw new Error( "\n AutomatedTask ParseDateError:" +
                     " String is empty \n" );
  }
  var arrNumParts = str.match( /\d+/g );
  if( arrNumParts === null ){
    throw new Error( "\n AutomatedTask ParseDateError:" +
                     " No numeric characters in: " + str + "\n" );
  }
  if( arrNumParts.length < 3){
    throw new Error( "\n AutomatedTask ParseDateError:" +
                     " 3 Parts of numeric characters are needed in: " + str + "\n" );
  }
  return new Date( parseInt(arrNumParts[0], 10), 
                   parseInt(arrNumParts[1], 10) - 1, 
                   parseInt(arrNumParts[2], 10) ); // months are 0-based
  // Note: new Date("2014-11-10") // Mon Nov 10 2014 09:00:00 GMT+0900 (JST)
  // Note: new Date(2014, 10, 10) // Mon Nov 10 2014 00:00:00 GMT+0900 (JST)
}
/*

Notes:
- When the process reaches the automated task, the day of the week of the date data is automatically determined.
    - `YYYY-MM-DD` (date type format), `YYYY/MM/DD`, etc.
    - `YYYY-MM-DD hh:mm` (datetime data format) can also be determined.
- Set the day of the week string in CSV format.
    - `Sun,Mon,Tue,Wed,Thu,Fri,Sat`
    - `Closed,Open,Open,Open,Open,Open,Closed`
    - `Sun.,Mon.,Tue.,Wed.,Thu.,Fri.,Sat.`
    - `(S),(M),(T),(W),(T),(F),(S)`
    - `Sun,Moon,Ares,Hermes,Zeus,Aphrodite,Cronos`
    - `日,月,火,水,木,金,土`
    - `定休日,営業日,営業日,営業日,営業日,営業日,定休日`
    - `(日),(月),(火),(水),(木),(金),(土)`
- Commas cannot be included in the day of the week string.

Notes-ja:
- 案件が自動処理工程に到達した際、日付データの曜日が自動判定されます。
    - `YYYY-MM-DD` (日付型データの書式) や `YYYY/MM/DD` など
    - `YYYY-MM-DD hh:mm` (日時型データの書式) も判定できます。
- 曜日文字列は、CSV書式で設定します。
    - `日,月,火,水,木,金,土`
    - `定休日,営業日,営業日,営業日,営業日,営業日,定休日`
    - `(日),(月),(火),(水),(木),(金),(土)`
    - `Sun,Mon,Tue,Wed,Thu,Fri,Sat`
    - `Closed,Open,Open,Open,Open,Open,Closed`
    - `Sun.,Mon.,Tue.,Wed.,Thu.,Fri.,Sat.`
    - `(S),(M),(T),(W),(T),(F),(S)`
    - `Sun,Moon,Ares,Hermes,Zeus,Aphrodite,Cronos`
- 曜日文字列にカンマは含められません。
*/