import { describe, it, expect } from 'vitest';
import { buildSessionsCsv, quote, formatDuration, type SessionCsvRow } from '../src/lib/csv';

const row: SessionCsvRow = {
  id: 7,
  activityName: 'Frezen',
  userName: 'Jan',
  insoleType: 'Kurk',
  pairCount: 2,
  startTime: new Date('2026-06-17T08:00:00Z'),
  endTime: new Date('2026-06-17T08:01:30Z'),
  durationSeconds: 90,
  pausedSeconds: 0,
};

describe('buildSessionsCsv', () => {
  it('omits the Worker column by default (legacy header)', () => {
    const lines = buildSessionsCsv([row]).split('\n');
    expect(lines[0]).toBe(
      '"ID","Task","Insole Type","No. of Insoles","Date","Total Duration","Paused Duration","Start Time","End Time"',
    );
    expect(lines[1]).toContain('"Frezen"');
    expect(lines[1]).toContain('"00:01:30"');
    expect(lines[1]).not.toContain('"Jan"');
  });

  it('prepends a Worker column when includeWorker is true', () => {
    const lines = buildSessionsCsv([row], { includeWorker: true }).split('\n');
    expect(lines[0]).toBe(
      '"Worker","ID","Task","Insole Type","No. of Insoles","Date","Total Duration","Paused Duration","Start Time","End Time"',
    );
    expect(lines[1].startsWith('"Jan"')).toBe(true);
  });

  it('applies legacy fallbacks for null fields and blanks a missing end time', () => {
    // Every nullable field null (+ pairCount null via cast, since the type is non-null
    // but the code still carries a legacy `?? 2` default). includeWorker exercises the
    // userName fallback too. Covers each `??` fallback branch and the null-end-time branch.
    const emptyRow = {
      id: 1,
      activityName: null,
      userName: null,
      insoleType: null,
      pairCount: null,
      startTime: new Date('2026-06-17T08:00:00Z'),
      endTime: null,
      durationSeconds: null,
      pausedSeconds: null,
    } as unknown as SessionCsvRow;

    const cells = buildSessionsCsv([emptyRow], { includeWorker: true }).split('\n')[1].split(',');
    expect(cells[0]).toBe('""'); // Worker → ''
    expect(cells[1]).toBe('"1"'); // ID
    expect(cells[2]).toBe('""'); // Task → ''
    expect(cells[3]).toBe('"Kurk"'); // Insole Type → legacy default
    expect(cells[4]).toBe('"2"'); // No. of Insoles → legacy default
    expect(cells[6]).toBe('"00:00:00"'); // Total Duration → 0
    expect(cells[7]).toBe('"00:00:00"'); // Paused Duration → 0
    expect(cells[9]).toBe('""'); // End Time → '' (null end)
  });

  it('escapes commas, quotes and newlines inside a field', () => {
    const tricky: SessionCsvRow = { ...row, activityName: 'Frezen, "spoed"\n2e regel' };
    const csv = buildSessionsCsv([tricky]);
    // Comma stays inside the quoted cell, embedded quotes are doubled, newline is preserved.
    expect(csv).toContain('"Frezen, ""spoed""\n2e regel"');
  });
});

describe('csv helpers (edges)', () => {
  it('quote wraps and escapes commas, quotes and newlines', () => {
    expect(quote('a,b')).toBe('"a,b"');
    expect(quote('a"b')).toBe('"a""b"');
    expect(quote('a\nb')).toBe('"a\nb"');
  });

  it('formatDuration renders zero and lets hours exceed 99', () => {
    expect(formatDuration(0)).toBe('00:00:00');
    expect(formatDuration(3661)).toBe('01:01:01');
    expect(formatDuration(360000)).toBe('100:00:00');
  });
});