Report working days (wednesdays and fridays) for a month

report-days.ts

#!/usr/bin/env -S deno run --allow-run --quiet

// Collect 5 complete days from the last working month for reporting.

// Everything this or higher adresses the current month.
const MIN_DAY = 27;
const WORK_DAYS:Array<number> = [3, 5]; // ['Wendnesday', 'Friday']
const JANUARY = 0;
const DECEMBER = 11;
const MAX_DAYS = 31;

// Settings
const MAX_WORKING_DAYS = 5;
const excludeCarry = true;
const openMail = true; // otherwise the copy-method will be used

const { args } = Deno;
const printOnly = args?.[0] === '--print';

const today = new Date();
// If less than 27 we are likely at the beginning of a new month.
const usePreviousMonth:boolean = today.getDate() < MIN_DAY;


const isJanuary:boolean = today.getMonth() === JANUARY;

const month = usePreviousMonth ? (isJanuary ? DECEMBER : today.getMonth()) : today.getMonth() + 1;

const year:number = (usePreviousMonth && isJanuary) ? today.getFullYear() - 1 : today.getFullYear();

const workdays:Array<string> = [];


const isInvalid = (date:Date):boolean => date.toString() === 'Invalid Date';


for(let day = 1; day <= MAX_DAYS; day++) {
  const date = new Date(`${year}-${month}-${day}`);
  if (isInvalid(date)) break; // this does not seem to catch in Deno
  if (date.getDate() != day) break; // instead the month will be increased
  if (WORK_DAYS.includes(date.getDay())) {
    workdays.push(date.getDate().toString());
  }
}

const carry = workdays.length - MAX_WORKING_DAYS;

if (carry > 0) {
  workdays[1] = `(${workdays[1]})`;
  if (excludeCarry) workdays.splice(1, 1);
}

  // TODO(pascal): Following codes just repeats...
if (carry > 1) {
  workdays[workdays.length - 2] = `(${workdays[workdays.length - 2]})`;
  if (excludeCarry) workdays.splice(workdays.length - 2, 1);
}

if (carry > 2) {
  workdays[workdays.length - 3] = `(${workdays[workdays.length - 3]})`;
  if (excludeCarry) workdays.splice(workdays.length - 3, 1);
}

if (carry > 3) {
  workdays[workdays.length - 4] = `(${workdays[workdays.length - 4]})`;
  if (excludeCarry) workdays.splice(workdays.length - 4, 1);
}


const translate = (date:Date) => (new Intl.DateTimeFormat('de-DE', { dateStyle: 'full' })).formatToParts(date);

const workingMonthName = translate(new Date(`${year}-${month}-01`))[4].value;

const greetingDay = today.getHours() <= 11 ? 'Morgen' : (today.getHours() <= 13 ? 'Mittag' : 'Tag');

const signature = `
Viele Grüße
Pascal

Pronomen: er, ihm
`;

const buildText = (days:Array<string>) => `Guten ${greetingDay},

hier sind meine Arbeitstage für ${workingMonthName} ${year}:

- ${days.join('\r\n- ')}

${signature}`;

const copy = async (text:string) => {
  const p = Deno.run({
    cmd: ['pbcopy'],
    stdin: 'piped',
  });
  await p.stdin.write(new TextEncoder().encode(text));
  p.stdin.close();
  await p.status();
  console.debug(text, 'wurde kopiert.')
};

console.log('Heute ist', translate(today)[0].value, `der ${today.getDate()}.`);
console.log('Workdays:', `(${carry} Tage zu viel)`);

const recepients = 'em@i.ls';

const mailBody = buildText(workdays);

if (printOnly) {
  console.log(mailBody);
} else if (openMail) {
  const mailCommand = Deno.run({
    cmd: ['open', '-a', 'Mail', `mailto:${recepients}?subject=Arbeitstage ${workingMonthName}&body=${mailBody}`]
  });
  await mailCommand.status();

} else {
  await copy(mailBody);
}

// Deno.exit(0);