import assert from 'node:assert/strict';
import { buildScheduleColumns } from '../js/excel.js';

const employees = [
  { id: 'a1', name: 'Anna Müller' },
  { id: 'b1', name: 'Bernd Schulz' },
  { id: 'c1', name: 'Carla Weber' }
];

// Single employee per day
{
  const assignments = [
    { date: '2026-04-01', employeeId: 'a1' },
    { date: '2026-04-02', employeeId: 'b1' }
  ];
  const cols = buildScheduleColumns(assignments, employees);
  assert.deepEqual(cols.names, ['Anna Müller', 'Bernd Schulz'], 'names per single-entry day');
  assert.deepEqual(cols.dates, ['01.04.2026', '02.04.2026'], 'dates formatted DD.MM.YYYY');
}

// Two employees per day → joined with " & ", alphabetical
{
  const assignments = [
    { date: '2026-04-01', employeeId: 'b1' },  // Bernd inserted first
    { date: '2026-04-01', employeeId: 'a1' }   // Anna inserted second
  ];
  const cols = buildScheduleColumns(assignments, employees);
  assert.equal(cols.names.length, 1, 'one column per date');
  assert.equal(cols.names[0], 'Anna Müller & Bernd Schulz', 'names alphabetical, joined with " & "');
  assert.equal(cols.dates[0], '01.04.2026', 'one date entry');
}

// Three employees per day
{
  const assignments = [
    { date: '2026-04-01', employeeId: 'c1' },
    { date: '2026-04-01', employeeId: 'a1' },
    { date: '2026-04-01', employeeId: 'b1' }
  ];
  const cols = buildScheduleColumns(assignments, employees);
  assert.equal(cols.names[0], 'Anna Müller & Bernd Schulz & Carla Weber', 'three names joined alphabetical');
}

// Multiple dates with multiple employees, dates ascending
{
  const assignments = [
    { date: '2026-04-02', employeeId: 'a1' },
    { date: '2026-04-01', employeeId: 'b1' },
    { date: '2026-04-01', employeeId: 'a1' }
  ];
  const cols = buildScheduleColumns(assignments, employees);
  assert.deepEqual(cols.dates, ['01.04.2026', '02.04.2026'], 'dates sorted ascending');
  assert.deepEqual(cols.names, ['Anna Müller & Bernd Schulz', 'Anna Müller'], 'names per column in date order');
}

// Unknown employeeId: empty string slot, sorted with other names
{
  const assignments = [
    { date: '2026-04-01', employeeId: 'a1' },
    { date: '2026-04-01', employeeId: 'unknown' }
  ];
  const cols = buildScheduleColumns(assignments, employees);
  // Empty-string sorts before 'Anna Müller'
  assert.equal(cols.names[0], ' & Anna Müller', 'unknown employee → empty string in join');
}

console.log('All excel tests passed.');