// The 176x0 label: a cleared number field emitted `NaNin`, the browser dropped
// the declaration, and the code box fell back to auto height, which is zero for
// an image sized at 100% of it. Every case below is a value a number input can
// actually hold.

import { describe, it, expect } from 'vitest'

import { labelVars, LABEL_VAR_NAMES, VAR_FALLBACKS } from './labelVars'

const EMPTY_INPUT = ''   // what v-model.number leaves behind on a cleared field

describe('labelVars', () => {
  it('emits every property the stylesheet reads', () => {
    const vars = labelVars({})
    for (const name of LABEL_VAR_NAMES) expect(vars[name]).toBeTruthy()
  })

  it('never emits NaN or an empty length, whatever it is handed', () => {
    for (const junk of [EMPTY_INPUT, NaN, null, undefined, 'abc', Infinity]) {
      const vars = labelVars({
        labelwidth: junk, labelheight: junk, barheight: junk, codesize: junk,
        quiet: junk, gap: junk, padding: junk, labelfont: junk, picturesize: junk,
        contentx: junk, contenty: junk, nudgex: junk, nudgey: junk,
        pictureopacity: junk,
      })
      for (const name of LABEL_VAR_NAMES) {
        expect(vars[name]).not.toMatch(/NaN|Infinity|undefined|null/)
        expect(vars[name]).not.toBe('in')
      }
    }
  })

  it('falls back to a printable bar height rather than a zero-height box', () => {
    expect(labelVars({ barheight: EMPTY_INPUT })['--tool-barh'])
      .toBe(VAR_FALLBACKS.barheight + 'in')
    expect(labelVars({ barheight: 0 })['--tool-barh'])
      .toBe(VAR_FALLBACKS.barheight + 'in')
    expect(labelVars({ barheight: -2 })['--tool-barh'])
      .toBe(VAR_FALLBACKS.barheight + 'in')
  })

  it('keeps a real measurement', () => {
    const vars = labelVars({ labelwidth: 2.13, labelheight: 3.38, barheight: 0.5 })
    expect(vars['--tool-label-w']).toBe('2.13in')
    expect(vars['--tool-label-h']).toBe('3.38in')
    expect(vars['--tool-barh']).toBe('0.5in')
  })

  it('lets padding, quiet zone and gap be zero, because zero is a real answer', () => {
    const vars = labelVars({ padding: 0, quiet: 0, gap: 0 })
    expect(vars['--tool-pad']).toBe('0in')
    expect(vars['--tool-quiet']).toBe('0in')
    expect(vars['--tool-gap']).toBe('0in')
  })

  it('keeps offsets signed - a negative nudge is the whole point of a nudge', () => {
    const vars = labelVars({ contentx: -0.05, nudgey: -0.1, contenty: 0.02 })
    expect(vars['--tool-content-x']).toBe('-0.05in')
    expect(vars['--tool-nudge-y']).toBe('-0.1in')
    expect(vars['--tool-content-y']).toBe('0.02in')
  })

  it('refuses an alignment it does not recognise', () => {
    expect(labelVars({ align: 'flex-end' })['--tool-align']).toBe('flex-end')
    expect(labelVars({ align: 'sideways' })['--tool-align']).toBe('center')
    expect(labelVars({ valign: EMPTY_INPUT })['--tool-valign']).toBe('center')
  })

  it('clamps watermark opacity into a range that still prints', () => {
    expect(labelVars({ pictureopacity: 0.4 })['--tool-pic-opacity']).toBe('0.4')
    expect(labelVars({ pictureopacity: 0 })['--tool-pic-opacity'])
      .toBe(String(VAR_FALLBACKS.pictureopacity))
    expect(labelVars({ pictureopacity: 5 })['--tool-pic-opacity'])
      .toBe(String(VAR_FALLBACKS.pictureopacity))
  })
})