#!/usr/bin/env node
/**
 * Wrapper / Age Calculator
 * Usage:
 *   node umurku.js 2000-05-15
 *   node umurku.js 15/05/2000
 *   node umurku.js 2000-05-15 --json
 */

import { parseArgs } from 'node:util';

// ====================== HELPER ======================
function parseDate(input) {
  if (!input) throw new Error('Tanggal lahir wajib diisi');

  // Support: YYYY-MM-DD | DD/MM/YYYY | DD-MM-YYYY
  let year, month, day;

  if (input.includes('-') && input.split('-')[0].length === 4) {
    // YYYY-MM-DD
    [year, month, day] = input.split('-').map(Number);
  } else if (input.includes('/') || input.includes('-')) {
    // DD/MM/YYYY atau DD-MM-YYYY
    const parts = input.replace(/-/g, '/').split('/');
    [day, month, year] = parts.map(Number);
  } else {
    throw new Error('Format tanggal tidak dikenali. Gunakan YYYY-MM-DD atau DD/MM/YYYY');
  }

  const d = new Date(year, month - 1, day);
  if (isNaN(d.getTime()) || d.getDate() !== day) {
    throw new Error('Tanggal tidak valid');
  }
  return d;
}

function getMonthDiff(d1, d2) {
  let months = (d2.getFullYear() - d1.getFullYear()) * 12;
  months -= d1.getMonth();
  months += d2.getMonth();
  return months <= 0 ? 0 : months % 12;
}

function getDayName(date) {
  return date.toLocaleDateString('id-ID', { weekday: 'long' });
}

function getZodiac(month, day) {
  const zodiacs = [
    { name: 'Capricorn', start: [12, 22], end: [1, 19] },
    { name: 'Aquarius', start: [1, 20], end: [2, 18] },
    { name: 'Pisces', start: [2, 19], end: [3, 20] },
    { name: 'Aries', start: [3, 21], end: [4, 19] },
    { name: 'Taurus', start: [4, 20], end: [5, 20] },
    { name: 'Gemini', start: [5, 21], end: [6, 20] },
    { name: 'Cancer', start: [6, 21], end: [7, 22] },
    { name: 'Leo', start: [7, 23], end: [8, 22] },
    { name: 'Virgo', start: [8, 23], end: [9, 22] },
    { name: 'Libra', start: [9, 23], end: [10, 22] },
    { name: 'Scorpio', start: [10, 23], end: [11, 21] },
    { name: 'Sagittarius', start: [11, 22], end: [12, 21] },
  ];

  for (const z of zodiacs) {
    const [sm, sd] = z.start;
    const [em, ed] = z.end;
    if ((month === sm && day >= sd) || (month === em && day <= ed)) {
      return z.name;
    }
  }
  return 'Capricorn';
}

function nextBirthday(birth, now) {
  let next = new Date(now.getFullYear(), birth.getMonth(), birth.getDate());
  if (next < now) {
    next = new Date(now.getFullYear() + 1, birth.getMonth(), birth.getDate());
  }
  const diffMs = next - now;
  const daysLeft = Math.ceil(diffMs / (1000 * 60 * 60 * 24));
  return {
    tanggal: next.toLocaleDateString('id-ID', { day: 'numeric', month: 'long', year: 'numeric' }),
    sisa_hari: daysLeft,
  };
}

// ====================== CORE CALCULATOR ======================
export function hitungUmur(tanggalLahirInput, tanggalAcuan = new Date()) {
  const tglLahir = parseDate(tanggalLahirInput);
  const sekarang = new Date(tanggalAcuan);

  if (sekarang - tglLahir < 0) {
    throw new Error('Tanggal lahir tidak boleh melebihi tanggal acuan!');
  }

  // --- Logika sama persis dengan umurku.com ---
  let tahun = sekarang.getFullYear() - tglLahir.getFullYear();
  let bulan = getMonthDiff(tglLahir, sekarang);
  let hari = sekarang.getDate() - tglLahir.getDate();

  if (hari < 0) {
    bulan--;
    const bulanLalu = new Date(sekarang.getFullYear(), sekarang.getMonth(), 0).getDate();
    hari += bulanLalu;
  }
  if (bulan < 0) {
    tahun--;
    bulan += 12;
  }

  const selisihMs = sekarang - tglLahir;
  const totalDetik = Math.floor(selisihMs / 1000);
  const totalMenit = Math.floor(totalDetik / 60);
  const totalJam = Math.floor(totalMenit / 60);
  const totalHari = Math.floor(totalJam / 24);

  const next = nextBirthday(tglLahir, sekarang);

  return {
    tanggal_lahir: tglLahir.toLocaleDateString('id-ID', {
      day: 'numeric',
      month: 'long',
      year: 'numeric',
    }),
    hari_lahir: getDayName(tglLahir),
    zodiak: getZodiac(tglLahir.getMonth() + 1, tglLahir.getDate()),
    tanggal_acuan: sekarang.toLocaleDateString('id-ID', {
      day: 'numeric',
      month: 'long',
      year: 'numeric',
    }),
    umur: {
      tahun,
      bulan,
      hari,
    },
    total: {
      hari: totalHari,
      jam: totalJam,
      menit: totalMenit,
      detik: totalDetik,
    },
    ulang_tahun_berikutnya: next,
    teks: `Pada hari ini, tanggal ${sekarang.toLocaleDateString('id-ID', {
      day: 'numeric',
      month: 'long',
      year: 'numeric',
    })}, umur kita adalah: ${tahun} Tahun, ${bulan} Bulan, ${hari} Hari`,
  };
}

// ====================== CLI ======================
if (import.meta.url === `file://${process.argv[1]}`) {
  try {
    const { values, positionals } = parseArgs({
      allowPositionals: true,
      options: {
        json: { type: 'boolean', short: 'j', default: true },
        help: { type: 'boolean', short: 'h' },
      },
    });

    if (values.help || positionals.length === 0) {
      console.log(`
Penggunaan:
  node umurku.js <tanggal-lahir> [--json]

Contoh:
  node umurku.js 2000-05-15
  node umurku.js 15/05/2000
  node umurku.js 2000-05-15 --json
      `);
      process.exit(0);
    }

    const hasil = hitungUmur(positionals[0]);
    console.log(JSON.stringify(hasil, null, 2));
  } catch (err) {
    console.error(JSON.stringify({ error: err.message }, null, 2));
    process.exit(1);
  }
}