import test from 'node:test'
import assert from 'node:assert/strict'

import { buildChartDatasets } from '../../assets/js/chart_dataset_config.mjs'

test('preserves explicit fill settings on traffic datasets', () => {
  const datasets = buildChartDatasets(
    {
      datasets: [
        { label: 'Outbound', data: [{ x: 1, y: -100 }] },
        { label: 'Capacity (Out)', data: [{ x: 1, y: -300 }], fill: false, borderDash: [5, 5] }
      ]
    },
    { isTrafficChart: true, dualAxis: false }
  )

  assert.equal(datasets[0].fill, 'origin')
  assert.equal(datasets[1].fill, false)
  assert.deepEqual(datasets[1].borderDash, [5, 5])
})

test('uses stepped fill for dual-axis status datasets', () => {
  const datasets = buildChartDatasets(
    {
      datasets: [
        { label: 'Status', yAxisID: 'y1', data: [{ x: 1, y: 1 }] }
      ]
    },
    { isTrafficChart: false, dualAxis: true }
  )

  assert.equal(datasets[0].stepped, 'before')
  assert.equal(datasets[0].fill, 'origin')
})