import assert from 'node:assert/strict'
import { test } from 'node:test'
import { mkdtemp, readFile, rm, writeFile } from 'node:fs/promises'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import {
  WindowSettings,
  fitControlBounds,
  parseWindowPreferences,
  preferredDisplayId,
} from './window-settings.js'

const primary = { x: -1920, y: -200, width: 1920, height: 1080 }
test('пульт возвращается с отключённого монитора и помещается в рабочую область основного', () => {
  const bounds = fitControlBounds({ x: 5000, y: -5000, width: 3840, height: 2160 }, primary)
  assert.deepEqual(bounds, primary)
  assert.deepEqual(fitControlBounds(undefined, { x: 100, y: 50, width: 500, height: 300 }), {
    x: 100,
    y: 50,
    width: 500,
    height: 300,
  })
  const saved = { x: -1800, y: 0, width: 1000, height: 800 }
  assert.deepEqual(fitControlBounds(saved, primary), saved)
  const centered = fitControlBounds(undefined, primary)
  assert.equal(centered.x, -1460)
  assert.equal(centered.y, -60)
})

test('внешний дисплей предвыбирается только при совпадении ID и названия', () => {
  const saved = { id: 2, label: 'Projector' }
  const displays = [{ id: 1, label: 'Laptop' }, saved]
  assert.equal(preferredDisplayId(saved, displays, 1), 2)
  assert.equal(preferredDisplayId(saved, displays, 2), null)
  assert.equal(preferredDisplayId(saved, [{ id: 2, label: 'Other' }], 1), null)
  assert.equal(preferredDisplayId(saved, [{ id: 3, label: 'Projector' }], 1), null)
  assert.equal(preferredDisplayId(saved, [], 1), null)
})

test('проверяет локальный файл настроек и не принимает повреждённую геометрию', () => {
  const valid = {
    version: 1,
    control: { bounds: primary, maximized: true },
    display: { id: -2, label: 'Экран' },
  }
  assert.equal(parseWindowPreferences(valid).control?.maximized, true)
  for (const bad of [
    null,
    {},
    { ...valid, version: 2 },
    { ...valid, control: { bounds: { ...primary, width: 0 }, maximized: true } },
    { ...valid, control: { bounds: primary, maximized: 'true' } },
    { ...valid, display: { id: 2.5, label: 'Other' } },
  ])
    assert.throws(() => parseWindowPreferences(bad))
})

test('последняя геометрия и выбор дисплея сохраняются атомарно, ошибочный файл не мешает запуску', async (t) => {
  const dir = await mkdtemp(join(tmpdir(), 'screen-windows-'))
  t.after(() => rm(dir, { recursive: true, force: true }))
  const path = join(dir, 'windows.json')
  const store = new WindowSettings(path)
  await store.load()
  assert.deepEqual(store.value, { control: null, display: null })
  store.value = {
    control: { bounds: primary, maximized: true },
    display: { id: 2, label: 'Projector' },
  }
  store.save()
  store.value.control!.bounds = { ...primary, width: 800 }
  store.save()
  const restored = new WindowSettings(path)
  await restored.load()
  assert.deepEqual(restored.value, store.value)
  assert.equal(JSON.parse(await readFile(path, 'utf8')).version, 1)
  await writeFile(path, '{bad')
  const broken = new WindowSettings(path)
  await assert.rejects(broken.load(), /повреждены/)
  assert.deepEqual(broken.value, { control: null, display: null })
})