const assert = require('assert');
const fs = require('fs');
const os = require('os');
const path = require('path');
const {
  buildBloodPressureFrame,
  parseBloodPressureTimeText,
  prepareSimulation,
} = require('../tcp-simulator');

describe('tcp-simulator', () => {
  it('parses blood pressure time text', () => {
    assert.deepStrictEqual(
      parseBloodPressureTimeText('2026-04-15 09:30'),
      [26, 4, 15, 9, 30],
    );
  });

  it('builds blood pressure frame with additive checksum', () => {
    const frame = buildBloodPressureFrame({
      bpSystolic: 120,
      bpDiastolic: 80,
      bpPulse: 89,
      bpTime: '2026-04-15 09:30',
      bpIncludeTime: true,
    });

    assert.strictEqual(
      frame.raw,
      'AA 55 0E BA 00 78 50 59 1A 04 0F 09 1E 3C',
    );
  });

  it('can append a blood pressure frame to file mode simulation', () => {
    const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'tcp-simulator-'));
    const framesFile = path.join(tempDir, 'frames.txt');
    fs.writeFileSync(framesFile, 'EE 55 01 00 00 01 72 74\n', 'utf8');

    try {
      const prepared = prepareSimulation({
        mode: 'file',
        framesFile,
        scenarioConfig: null,
        includeBloodPressure: true,
        bpSystolic: 120,
        bpDiastolic: 80,
        bpPulse: 89,
        bpTime: '2026-04-15 09:30',
        bpIncludeTime: true,
      });

      assert.strictEqual(prepared.frames.length, 2);
      assert.strictEqual(prepared.frames[1].raw, 'AA 55 0E BA 00 78 50 59 1A 04 0F 09 1E 3C');
      assert.deepStrictEqual(prepared.analysis.snapshot, {
        F: 37,
        N: 120,
        O: 80,
        P: 89,
      });
    } finally {
      fs.rmSync(tempDir, { recursive: true, force: true });
    }
  });
});