import test from 'node:test'
import assert from 'node:assert/strict'
import { clampDragX, getTabBarFrame, tabIndexAtX } from '../src/custom-tab-bar/tabBarGeometry.js'

test('maps a drag x to the tab under the finger', () => {
  assert.equal(tabIndexAtX(10, 100, 5), 0)
  assert.equal(tabIndexAtX(30, 100, 5), 1)
  assert.equal(tabIndexAtX(50, 100, 5), 2)
  assert.equal(tabIndexAtX(70, 100, 5), 3)
  assert.equal(tabIndexAtX(90, 100, 5), 4)
})

test('clamps drag positions outside the bar', () => {
  assert.equal(tabIndexAtX(-10, 100, 5), 0)
  assert.equal(tabIndexAtX(200, 100, 5), 4)
  assert.equal(clampDragX(-5, 100), 0)
  assert.equal(clampDragX(120, 100), 100)
  assert.equal(clampDragX(Number.NaN, 100), 0)
})

test('derives the floating bar frame from window width', () => {
  assert.deepEqual(getTabBarFrame(375), { left: 18, width: 339 })
  assert.deepEqual(getTabBarFrame(750), { left: 36, width: 678 })
})