import { createHash } from 'node:crypto'
import { existsSync } from 'node:fs'
import { mkdir, readFile, writeFile } from 'node:fs/promises'
import { spawnSync } from 'node:child_process'
import { resolve } from 'node:path'
import { isDeepStrictEqual } from 'node:util'
import { unzipSync } from 'fflate'
import { createWebCadFacade } from '../src/facade/mockFacade'
import { decodeFcstdPropertyValue } from '../src/facade/fcstd'

const root = resolve(new URL('..', import.meta.url).pathname)
const executable = process.env.FREECAD_CMD || resolve(root, '.cache/freecad/install-desktop/bin/FreeCADCmd')
const sysroot = resolve(root, '.cache/freecad/sysroot')
const scriptPath = resolve(root, 'scripts/freecad-property-file-roundtrip.py')
const outputDirectory = resolve(root, '.cache/freecad/property-file-roundtrip')
const nativePath = resolve(outputDirectory, 'native-initial.FCStd')
const webPath = resolve(outputDirectory, 'web-edited.FCStd')
const resavedPath = resolve(outputDirectory, 'native-resaved.FCStd')
const alternateAssetPath = resolve(outputDirectory, 'alternate.obj')
const reportPath = resolve(root, 'config/freecad-property-file-roundtrip.json')
const initial = '.cache/freecad/FreeCAD/data/tests/mesh.obj'
const target = '.cache/freecad/property-file-roundtrip/alternate.obj'
if (!existsSync(executable)) throw new Error(`FreeCAD PropertyFile roundtrip executable is missing: ${executable}`)
if (!existsSync(resolve(root, initial))) throw new Error(`FreeCAD PropertyFile initial asset is missing: ${initial}`)
await mkdir(outputDirectory, { recursive: true })
await writeFile(alternateAssetPath, '# PropertyFile roundtrip triangle\nv 0 0 0\nv 4 0 0\nv 0 3 0\nf 1 2 3\n')

const runNative = (mode: 'create' | 'verify', path: string, resaved = '') => {
  const execution = spawnSync(executable, ['--python-path', resolve(sysroot, 'usr/lib/python3/dist-packages'), scriptPath], {
    cwd: root,
    encoding: 'utf8',
    timeout: 120_000,
    maxBuffer: 32 * 1024 * 1024,
    env: {
      ...process.env,
      FREECAD_PROPERTY_FILE_ROUNDTRIP_MODE: mode,
      FREECAD_PROPERTY_FILE_ROUNDTRIP_PATH: path,
      FREECAD_PROPERTY_FILE_ROUNDTRIP_RESAVED_PATH: resaved,
      FREECAD_PROPERTY_FILE_ROUNDTRIP_INITIAL: initial,
      PYTHONPATH: `${resolve(sysroot, 'usr/lib/python3/dist-packages')}${process.env.PYTHONPATH ? `:${process.env.PYTHONPATH}` : ''}`,
      LD_LIBRARY_PATH: `${resolve(sysroot, 'usr/lib/x86_64-linux-gnu')}${process.env.LD_LIBRARY_PATH ? `:${process.env.LD_LIBRARY_PATH}` : ''}`,
    },
  })
  const output = `${execution.stdout || ''}\n${execution.stderr || ''}`
  const marker = 'FREECAD_PROPERTY_FILE_ROUNDTRIP_RESULT='
  const line = output.split(/\r?\n/).find((candidate) => candidate.includes(marker))
  if (execution.error || execution.status !== 0 || !line) throw new Error(`FreeCAD PropertyFile ${mode} probe failed with status ${execution.status}: ${execution.error?.message || output.trim()}`)
  return JSON.parse(line.slice(line.indexOf(marker) + marker.length))
}

const native = runNative('create', nativePath)
const nativeBytes = new Uint8Array(await readFile(nativePath))
const facade = createWebCadFacade({ runtimeMode: 'mock' })
const inspectedBefore = facade.project.fcstd.inspect(nativeBytes)
const property = (inspection: typeof inspectedBefore) => inspection.objects.find((object) => object.name === 'FileProbe')?.properties.find((candidate) => candidate.name === 'FileName')
const editedBytes = facade.project.fcstd.rewriteFile(nativeBytes, { objectName: 'FileProbe', propertyName: 'FileName', value: target, expectedValue: initial })
const inspectedAfter = facade.project.fcstd.inspect(editedBytes)
await facade.project.dispose()
await writeFile(webPath, editedBytes)

const initialFiles = unzipSync(nativeBytes)
const editedFiles = unzipSync(editedBytes)
const opaquePaths = Object.keys(initialFiles).filter((path) => path.toLowerCase() !== 'document.xml')
const opaqueEntriesPreserved = opaquePaths.every((path) => Buffer.from(initialFiles[path]).equals(Buffer.from(editedFiles[path] ?? new Uint8Array())))
const withoutEditedProperty = (inspection: typeof inspectedBefore) => inspection.objects.map((object) => ({ ...object, properties: object.name === 'FileProbe' ? object.properties.filter((candidate) => candidate.name !== 'FileName') : object.properties }))
const semanticObjectsPreserved = isDeepStrictEqual(withoutEditedProperty(inspectedBefore), withoutEditedProperty(inspectedAfter))
const editedDocumentXml = new TextDecoder().decode(editedFiles['Document.xml'])
const targetMarkedTouched = /<Object(?=[^>]*name="FileProbe")(?=[^>]*Touched="1")[^>]*\/>/.test(editedDocumentXml)
const decodedAfter = property(inspectedAfter) ? decodeFcstdPropertyValue(property(inspectedAfter)!) : undefined
const webOutputMatches = decodedAfter?.decoded === true && decodedAfter.value === target
const nativeAfter = runNative('verify', webPath, resavedPath)
const resavedBytes = new Uint8Array(await readFile(resavedPath))
const nativeSnapshots = [nativeAfter.result.reopened, nativeAfter.result.resaved]
const nativeOutputMatches = nativeSnapshots.every((snapshot: any) => snapshot.object.value === target)
const objectSetPreserved = nativeSnapshots.every((snapshot: any) => isDeepStrictEqual(native.result.objectSet, snapshot.objectSet))
const nativeMeshChanged = !isDeepStrictEqual(native.result.object.mesh, nativeAfter.result.reopened.object.mesh)
const nativeMeshStable = isDeepStrictEqual(nativeAfter.result.reopened.object.mesh, nativeAfter.result.resaved.object.mesh)
const asset = async (path: string) => {
  const bytes = await readFile(resolve(root, path))
  return { path, bytes: bytes.byteLength, sha256: createHash('sha256').update(bytes).digest('hex') }
}
const assets = { initial: await asset(initial), target: await asset(target) }
const zeroUnknownDrift = opaqueEntriesPreserved && semanticObjectsPreserved && targetMarkedTouched && webOutputMatches && nativeOutputMatches && objectSetPreserved && nativeMeshChanged && nativeMeshStable
const report = {
  schemaVersion: 1,
  status: zeroUnknownDrift ? 'pass' : 'fail',
  baselineId: 'freecad-1.1.1-property-file-roundtrip',
  freecadVersion: native.freecadVersion,
  gitCommit: native.gitCommit,
  propertyType: 'App::PropertyFile',
  assets,
  archives: {
    nativeInitial: { path: '.cache/freecad/property-file-roundtrip/native-initial.FCStd', bytes: nativeBytes.byteLength, sha256: createHash('sha256').update(nativeBytes).digest('hex') },
    webEdited: { path: '.cache/freecad/property-file-roundtrip/web-edited.FCStd', bytes: editedBytes.byteLength, sha256: createHash('sha256').update(editedBytes).digest('hex') },
    nativeResaved: { path: '.cache/freecad/property-file-roundtrip/native-resaved.FCStd', bytes: resavedBytes.byteLength, sha256: createHash('sha256').update(resavedBytes).digest('hex') },
  },
  nativeInitial: native.result,
  web: {
    before: property(inspectedBefore),
    after: property(inspectedAfter),
    targetMarkedTouched,
    webOutputMatches,
    semanticObjectsPreserved,
    opaquePathsPreserved: opaquePaths.length,
    opaqueEntriesPreserved,
  },
  nativeAfter: nativeAfter.result,
  classification: {
    requestedValue: target,
    webValue: decodedAfter?.value,
    reopenedValue: nativeAfter.result.reopened.object.value,
    resavedValue: nativeAfter.result.resaved.object.value,
    nativeOutputMatches,
    objectSetPreserved,
    nativeMeshChanged,
    nativeMeshStable,
    externalResourceBoundary: 'project-relative-path; asset bytes remain external to FCStd',
    unknownSemanticDrift: !zeroUnknownDrift,
    zeroUnknownDrift,
  },
}
await writeFile(reportPath, `${JSON.stringify(report, null, 2)}\n`)
console.log(JSON.stringify({ status: report.status, output: 'config/freecad-property-file-roundtrip.json', values: report.classification, mesh: { initial: report.nativeInitial.object.mesh, reopened: report.nativeAfter.reopened.object.mesh }, opaqueEntriesPreserved }, null, 2))
