// Field triggers (fields.yaml `trigger`, D-21, UI-SPEC C6): the pure
// helpers FormView and PreviewView call with the whole form's values.
// Fixtures are neutral acme.* data; no application names appear in
// framework tests.
import { beforeEach, describe, expect, it } from 'vitest'
import type { AdminRecord, FormField } from '../../src/api/types'
import { setBundle } from '../../src/app/i18n'
import { applyTriggers, triggerState } from '../../src/components/form/trigger'

const strings = {
  'backend::lang.form.trigger_disabled_on': { other: 'Not editable while “:field” is on.' },
  'backend::lang.form.trigger_disabled_off': { other: 'Not editable while “:field” is off.' },
}

const control: FormField = { name: 'is_admin', type: 'switch', label: 'Administrator' }

function triggered(action: 'disable' | 'hide', condition: 'checked' | 'unchecked', name = 'notes'): FormField {
  return { name, type: 'textarea', label: 'Notes', trigger: { action, field: 'is_admin', condition } }
}

const labelOf = (name: string) => (name === 'is_admin' ? 'Administrator' : name)

beforeEach(() => {
  setBundle(strings, 'en')
})

describe('triggerState', () => {
  const present = new Set(['is_admin', 'notes'])
  const on: unknown[] = [true, 1, '1', 'true', 'TRUE', 'yes']
  const off: unknown[] = [false, 0, '0', '', 'false', null, undefined]

  it('a checked trigger is active while the controlling value is on', () => {
    for (const value of on) {
      expect(triggerState(triggered('disable', 'checked'), { is_admin: value }, present), String(value)).toBe('active')
    }
    for (const value of off) {
      expect(triggerState(triggered('disable', 'checked'), { is_admin: value }, present), String(value)).toBe('inactive')
    }
  })

  it('an unchecked trigger is active while the controlling value is off', () => {
    for (const value of on) {
      expect(triggerState(triggered('hide', 'unchecked'), { is_admin: value }, present), String(value)).toBe('inactive')
    }
    for (const value of off) {
      expect(triggerState(triggered('hide', 'unchecked'), { is_admin: value }, present), String(value)).toBe('active')
    }
  })

  it('a missing value counts as off', () => {
    expect(triggerState(triggered('disable', 'checked'), {}, present)).toBe('inactive')
    expect(triggerState(triggered('disable', 'unchecked'), {}, present)).toBe('active')
  })

  it('a controlling field absent from the schema counts as off, whatever the values hold', () => {
    const absent = new Set(['notes'])
    expect(triggerState(triggered('disable', 'checked'), { is_admin: true }, absent)).toBe('inactive')
    expect(triggerState(triggered('hide', 'unchecked'), { is_admin: true }, absent)).toBe('active')
  })

  it('a field without a trigger is always inactive', () => {
    expect(triggerState({ name: 'title', type: 'text' }, { is_admin: true }, present)).toBe('inactive')
  })
})

describe('applyTriggers', () => {
  it('disable makes an active field a read-only copy with the note naming the controlling field', () => {
    const notes = triggered('disable', 'checked')
    const fields = [control, notes]
    const values: AdminRecord = { is_admin: true }
    const result = applyTriggers(fields, values, labelOf)
    expect(result.fields.map((field) => field.name)).toEqual(['is_admin', 'notes'])
    expect(result.fields[1]!.readOnly).toBe(true)
    expect(result.fields[1]).not.toBe(notes)
    expect(result.notes).toEqual({ notes: 'Not editable while “Administrator” is on.' })
    // The inputs are not changed.
    expect(notes.readOnly).toBeUndefined()
    expect(fields).toHaveLength(2)
    expect(values).toEqual({ is_admin: true })
  })

  it('an unchecked disable trigger uses the off note', () => {
    const result = applyTriggers([control, triggered('disable', 'unchecked')], { is_admin: false }, labelOf)
    expect(result.notes).toEqual({ notes: 'Not editable while “Administrator” is off.' })
  })

  it('an inactive trigger leaves the field as it is, without a note', () => {
    const notes = triggered('disable', 'checked')
    const result = applyTriggers([control, notes], { is_admin: false }, labelOf)
    expect(result.fields[1]).toBe(notes)
    expect(result.notes).toEqual({})
  })

  it('hide removes an active field and keeps the order of the rest', () => {
    const title: FormField = { name: 'title', type: 'text' }
    const result = applyTriggers([title, control, triggered('hide', 'checked'), { name: 'body', type: 'text' }], { is_admin: '1' }, labelOf)
    expect(result.fields.map((field) => field.name)).toEqual(['title', 'is_admin', 'body'])
    expect(result.notes).toEqual({})
  })

  it('a controlling field missing from the fields leaves a checked trigger inactive', () => {
    const notes = triggered('disable', 'checked')
    const result = applyTriggers([notes], { is_admin: true }, labelOf)
    expect(result.fields).toEqual([notes])
    expect(result.fields[0]!.readOnly).toBeUndefined()
    expect(result.notes).toEqual({})
  })

  it('several triggers on one switch apply together', () => {
    const result = applyTriggers(
      [control, triggered('disable', 'checked', 'a'), triggered('hide', 'checked', 'b'), triggered('hide', 'unchecked', 'c')],
      { is_admin: 1 },
      labelOf,
    )
    expect(result.fields.map((field) => [field.name, !!field.readOnly])).toEqual([
      ['is_admin', false],
      ['a', true],
      ['c', false],
    ])
    expect(Object.keys(result.notes)).toEqual(['a'])
  })
})