/**
 * RED test stubs for calendarConfig — Wave 0 state.
 *
 * These tests encode the contracts for calendarConfig.ts.
 * The tests reference the not-yet-built module apps/pwa/src/lib/calendarConfig.ts.
 *
 * Contracts locked here:
 *  1. WEEK_START_DAY === 0 (JS/date-fns Sunday convention) → Schedule-X firstDayOfWeek === 7
 *     (Temporal convention: 7 = Sunday, not 0)
 *     Passing 0 would silently default to Monday in Schedule-X v4.
 */

import { describe, it, expect } from 'vitest';

// Not yet built — import will fail (RED state) until Plan 03 implements calendarConfig.ts
import { WEEK_START_DAY, buildCalendarConfig } from './calendarConfig.js';

describe('calendarConfig — RED stubs (Wave 0)', () => {
  it('WEEK_START_DAY constant equals 0 (Sunday in JS/date-fns convention)', () => {
    // The project uses 0 = Sunday (JS/date-fns convention).
    // This constant is translated to 7 before passing to Schedule-X.
    expect(WEEK_START_DAY).toBe(0);
  });

  it('WEEK_START_DAY=0 translates to Schedule-X firstDayOfWeek === 7', () => {
    // Schedule-X v4 uses Temporal numbering: 1=Mon, 7=Sun.
    // WEEK_START_DAY=0 (JS Sunday) must become 7 (Temporal Sunday).
    // This avoids the Pitfall 1 silent failure where weeks start on Monday.
    const config = buildCalendarConfig([]);
    expect(config.firstDayOfWeek).toBe(7);
  });

  it('buildCalendarConfig includes shared-family calendar with id "shared"', () => {
    const config = buildCalendarConfig([]);
    expect(config.calendars).toHaveProperty('shared');
    expect(config.calendars['shared'].colorName).toBe('shared');
  });

  it('buildCalendarConfig includes per-member calendars keyed by String(userId)', () => {
    const members = [
      { id: '1', name: 'Lucas', color: '#4A90D9' },
      { id: '2', name: 'Spouse', color: '#E8734A' },
    ];
    const config = buildCalendarConfig(members);
    expect(config.calendars).toHaveProperty('1');
    expect(config.calendars).toHaveProperty('2');
    expect(config.calendars['1'].lightColors.main).toBe('#4A90D9');
    expect(config.calendars['2'].lightColors.main).toBe('#E8734A');
  });
});
