import assert from 'node:assert/strict'
import { readFile } from 'node:fs/promises'
import test from 'node:test'
import ts from 'typescript'

const sourceUrl = new URL('../../unreal_tran_web/src/features/scene-legacy/sceneCoverCapture.ts', import.meta.url)
const source = await readFile(sourceUrl, 'utf8')
const output = ts.transpileModule(source, {
  compilerOptions: { module: ts.ModuleKind.ESNext, target: ts.ScriptTarget.ES2022 },
  reportDiagnostics: true,
})
assert.deepEqual(output.diagnostics, [])
const { captureSceneCover } = await import(`data:text/javascript;base64,${Buffer.from(output.outputText).toString('base64')}`)

function fixture({ width = 1600, height = 900, renderError, drawError, encodeError, blob } = {}) {
  const events = []
  const transformHelper = { visible: true }
  const grid = { visible: false }
  const boundsHelper = { visible: true }
  const materials = [
    { original: { id: 'single-original' }, current: { id: 'single-highlighted' } },
    { original: [{ id: 'array-original-1' }, { id: 'array-original-2' }], current: [{ id: 'array-highlighted-1' }, { id: 'array-highlighted-2' }] },
  ]
  const entries = materials.map(({ original, current }) => ({ child: { material: current }, original, highlighted: current }))
  const sourceCanvas = { width, height }
  const scene = { children: [transformHelper, grid, boundsHelper, ...entries.map(entry => entry.child)] }
  const camera = Object.freeze({ position: Object.freeze({ x: 1, y: 2, z: 3 }) })
  const selected = entries[0].child
  const visibility = () => [transformHelper.visible, grid.visible, boundsHelper.visible]
  const snapshot = operation => ({ operation, visibility: visibility(), materials: entries.map(entry => entry.child.material) })
  let renders = 0
  const neverCalled = () => assert.fail('capture must not reset, detach, or dispose selection')
  const editor = {
    scene, camera, destroyed: false, selected,
    controls: { target: Object.freeze({ x: 0, y: 0, z: 0 }), update: neverCalled },
    transform: { getHelper: () => transformHelper, detach: neverCalled },
    grid,
    selectionHighlight: {
      helper: boundsHelper, materialEntries: entries, object: selected,
      setObject: neverCalled, clear: neverCalled, update: neverCalled,
    },
    renderer: {
      domElement: sourceCanvas,
      render(actualScene, actualCamera) {
        assert.equal(actualScene, scene)
        assert.equal(actualCamera, camera)
        events.push(snapshot('render'))
        renders += 1
        if (renders === 1 && renderError) throw renderError
      },
    },
  }
  const canvas = {
    width: 0, height: 0,
    getContext(kind) {
      assert.equal(kind, '2d')
      return {
        drawImage(...args) {
          assert.deepEqual(args, [sourceCanvas, 0, 0, canvas.width, canvas.height])
          events.push(snapshot('copy'))
          if (drawError) throw drawError
        },
      }
    },
    toBlob(callback, type, quality) {
      events.push({ ...snapshot('encode'), type, quality })
      if (encodeError) throw encodeError
      queueMicrotask(() => callback(blob === undefined ? new Blob(['jpeg'], { type }) : blob))
    },
  }
  const document = { createElement: tag => { assert.equal(tag, 'canvas'); return canvas } }
  const assertRestored = () => {
    assert.deepEqual(visibility(), [true, false, true])
    entries.forEach((entry, index) => {
      assert.equal(entry.child.material, materials[index].current)
      assert.equal(entry.original, materials[index].original)
      assert.equal(entry.highlighted, materials[index].current)
    })
    assert.equal(editor.selectionHighlight.materialEntries, entries)
    assert.equal(editor.selectionHighlight.object, selected)
    assert.equal(editor.selected, selected)
    assert.equal(scene.children.length, 5)
    assert.deepEqual(camera.position, { x: 1, y: 2, z: 3 })
    assert.deepEqual(editor.controls.target, { x: 0, y: 0, z: 0 })
  }
  return { editor, document, events, canvas, materials, entries, assertRestored }
}

test('copies synchronously without bounds, gizmo, grid or selection glow, then restores before JPEG encoding', async () => {
  const f = fixture()
  const pending = captureSceneCover(f.editor, { document: f.document })
  assert.deepEqual(f.events.map(event => event.operation), ['render', 'copy', 'render', 'encode'])
  for (const event of f.events.slice(0, 2)) {
    assert.deepEqual(event.visibility, [false, false, false])
    event.materials.forEach((material, index) => assert.equal(material, f.materials[index].original))
  }
  for (const event of f.events.slice(2)) {
    assert.deepEqual(event.visibility, [true, false, true])
    event.materials.forEach((material, index) => assert.equal(material, f.materials[index].current))
  }
  f.assertRestored()
  assert.equal(f.events[3].type, 'image/jpeg')
  assert.equal(f.events[3].quality, 0.85)
  const result = await pending
  assert.equal(result.type, 'image/jpeg')
  assert.equal(result.size, 4)
})

for (const { width, height, maxWidth, expected } of [
  { width: 1600, height: 900, expected: [640, 360] },
  { width: 900, height: 1600, expected: [360, 640] },
  { width: 320, height: 180, expected: [320, 180] },
  { width: 1600, height: 900, maxWidth: 320, expected: [320, 180] },
]) {
  test(`preserves the ${width} x ${height} ratio within ${maxWidth ?? 640}px and never upscales`, async () => {
    const f = fixture({ width, height })
    await captureSceneCover(f.editor, { document: f.document, maxWidth })
    assert.deepEqual([f.canvas.width, f.canvas.height], expected)
    f.assertRestored()
  })
}

for (const failure of ['drawError', 'renderError', 'encodeError']) {
  test(`restores helper visibility, scalar/array materials and selection after ${failure}`, async () => {
    const error = new Error(failure)
    const f = fixture({ [failure]: error })
    await assert.rejects(captureSceneCover(f.editor, { document: f.document }), actual => actual === error)
    f.assertRestored()
    assert.equal(f.events.filter(event => event.operation === 'render').length, 2)
    if (failure !== 'encodeError') assert.equal(f.events.some(event => event.operation === 'encode'), false)
  })
}

test('restores the actual material reference even if it differs from the recorded highlighted clone', async () => {
  const f = fixture()
  const replacement = { id: 'material-changed-after-selection' }
  f.entries[0].child.material = replacement
  await captureSceneCover(f.editor, { document: f.document })
  assert.equal(f.entries[0].child.material, replacement)
  assert.equal(f.events[0].materials[0], f.materials[0].original)
})

test('supports a ready scene without selection helpers', async () => {
  const f = fixture()
  delete f.editor.transform
  delete f.editor.grid
  delete f.editor.selectionHighlight
  assert.equal((await captureSceneCover(f.editor, { document: f.document })).type, 'image/jpeg')
})

test('deduplicates shared helper objects before recording visibility', async () => {
  const f = fixture()
  f.editor.transform.getHelper = () => f.editor.selectionHighlight.helper
  await captureSceneCover(f.editor, { document: f.document })
  f.assertRestored()
})

for (const blob of [null, new Blob([])]) {
  test(`rejects ${blob === null ? 'missing' : 'empty'} encoded images without disturbing the editor`, async () => {
    const f = fixture({ blob })
    await assert.rejects(captureSceneCover(f.editor, { document: f.document }), /编码结果为空/)
    f.assertRestored()
  })
}

test('refuses an unready or destroyed renderer before changing any scene state', async () => {
  for (const change of [
    f => { f.editor.destroyed = true },
    f => { f.editor.renderer = null },
    f => { f.editor.renderer.domElement.width = 0 },
    f => { f.editor.renderer.domElement.height = Number.NaN },
    f => { f.editor.scene = null },
    f => { f.editor.camera = null },
  ]) {
    const f = fixture()
    change(f)
    await assert.rejects(captureSceneCover(f.editor, { document: f.document }), /视口尚未准备好/)
    f.assertRestored()
    assert.equal(f.events.length, 0)
  }
})

test('refuses invalid dimensions and unavailable 2D canvas before changing scene state', async () => {
  const f = fixture()
  await assert.rejects(captureSceneCover(f.editor, { document: f.document, maxWidth: 0 }), /正数像素/)
  f.canvas.getContext = () => null
  await assert.rejects(captureSceneCover(f.editor, { document: f.document }), /不支持场景封面编码/)
  f.assertRestored()
  assert.equal(f.events.length, 0)
})