'use strict';

const { describe, it } = require('node:test');
const assert = require('node:assert/strict');
const {
  formatCourseTime,
  formatClassDays,
  formatClassStartDate,
  formatClassDaysFromIndexes,
  normalizeWeekdays,
  normalizeClockTime,
  buildClassScheduleContext
} = require('./classSchedule');

describe('class schedule SMS helpers', () => {
  it('formats course time as an hour range', () => {
    assert.equal(formatCourseTime('19:00', '21:00'), 'از 19 تا 21');
    assert.equal(formatCourseTime('19:30', '21:00'), 'از 19:30 تا 21');
  });

  it('joins class weekdays in Persian week order', () => {
    const atNoon = (year, month, day) => new Date(year, month - 1, day, 12, 0, 0);
    const monday = atNoon(2026, 8, 17);
    const saturday = atNoon(2026, 8, 15);
    const wednesday = atNoon(2026, 8, 19);

    assert.equal(
      formatClassDays([
        { day: monday },
        { day: saturday },
        { day: wednesday },
        { day: saturday }
      ]),
      'شنبه، دوشنبه و چهارشنبه'
    );
  });

  it('builds start date, days, and course time from class and sessions', () => {
    const atNoon = (year, month, day) => new Date(year, month - 1, day, 12, 0, 0);
    const context = buildClassScheduleContext(
      { startDate: atNoon(2026, 8, 15) },
      [
        { day: atNoon(2026, 8, 15), startTime: '19:00', endTime: '21:00' },
        { day: atNoon(2026, 8, 17), startTime: '19:00', endTime: '21:00' }
      ]
    );

    assert.ok(context.classStartDate);
    assert.equal(context.classDays, 'شنبه و دوشنبه');
    assert.equal(context.courseTime, 'از 19 تا 21');
  });

  it('uses the current session for course time when provided', () => {
    const context = buildClassScheduleContext(
      { startDate: new Date('2026-08-15T00:00:00Z') },
      [{ day: new Date('2026-08-15T00:00:00Z'), startTime: '19:00', endTime: '21:00' }],
      { startTime: '10:00', endTime: '12:00' }
    );

    assert.equal(context.courseTime, 'از 10 تا 12');
  });

  it('prefers stored class days and times over inferred sessions', () => {
    const atNoon = (year, month, day) => new Date(year, month - 1, day, 12, 0, 0);
    const context = buildClassScheduleContext(
      {
        startDate: atNoon(2026, 8, 15),
        days: [6, 1],
        startTime: '18:00',
        endTime: '20:00'
      },
      [
        { day: atNoon(2026, 8, 16), startTime: '19:00', endTime: '21:00' }
      ]
    );

    assert.equal(context.classDays, 'شنبه و دوشنبه');
    assert.equal(context.courseTime, 'از 18 تا 20');
  });
});

describe('class weekday and time normalization', () => {
  it('deduplicates weekdays and sorts them in Iran week order', () => {
    assert.deepEqual(normalizeWeekdays([1, 6, 1, 3, 9, '2']), [6, 1, 2, 3]);
  });

  it('normalizes clock times to HH:mm', () => {
    assert.equal(normalizeClockTime('19'), '19:00');
    assert.equal(normalizeClockTime('9:5'), '09:05');
    assert.equal(normalizeClockTime('19:00'), '19:00');
    assert.equal(normalizeClockTime('25:00'), '');
    assert.equal(normalizeClockTime(''), '');
  });

  it('formats stored weekday indexes as Persian day names', () => {
    assert.equal(formatClassDaysFromIndexes([1, 6]), 'شنبه و دوشنبه');
  });
});