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 { unzipSync } from 'fflate'
import { createWebCadFacade } from '../src/facade/mockFacade'

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-heatflux-roundtrip.py')
const outputDirectory = resolve(root, '.cache/freecad/property-heatflux-roundtrip')
const nativePath = resolve(outputDirectory, 'native-initial.FCStd')
const webPath = resolve(outputDirectory, 'web-edited.FCStd')
const resavedPath = resolve(outputDirectory, 'native-resaved.FCStd')
const reportPath = resolve(root, 'config/freecad-property-heatflux-roundtrip.json')
if (!existsSync(executable)) throw new Error(`FreeCAD PropertyHeatFlux roundtrip executable is missing: ${executable}`)
await mkdir(outputDirectory, { recursive: true })

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_HEATFLUX_ROUNDTRIP_MODE: mode,
      FREECAD_PROPERTY_HEATFLUX_ROUNDTRIP_PATH: path,
      FREECAD_PROPERTY_HEATFLUX_ROUNDTRIP_RESAVED_PATH: resaved,
      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_HEATFLUX_ROUNDTRIP_RESULT='
  const line = output.split(/\r?\n/).find((candidate) => candidate.includes(marker))
  if (execution.error || execution.status !== 0 || !line) throw new Error(`FreeCAD PropertyHeatFlux ${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 editedBytes = facade.project.fcstd.rewriteNumeric(nativeBytes, { objectName: 'HeatFluxProbe', propertyName: 'DFlux', typeId: 'App::PropertyHeatFlux', value: 500, expectedValue: 0 })
await writeFile(webPath, editedBytes)
const inspectedAfter = facade.project.fcstd.inspect(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 normalizeInspection = (inspection: typeof inspectedBefore) => inspection.objects.map((object) => ({ ...object, properties: object.properties.map((property) => object.name === 'HeatFluxProbe' && property.name === 'DFlux' ? { ...property, value: '<edited>' } : property) }))
const semanticObjectsPreserved = JSON.stringify(normalizeInspection(inspectedBefore)) === JSON.stringify(normalizeInspection(inspectedAfter))
const nativeAfter = runNative('verify', webPath, resavedPath)
const resavedBytes = new Uint8Array(await readFile(resavedPath))
const nativeValueMatches = [nativeAfter.result.reopened, nativeAfter.result.resaved].every((snapshot) => snapshot.heatFlux.property.value.numeric === 500)
const report = {
  schemaVersion: 1,
  status: 'pass',
  baselineId: 'freecad-1.1.1-property-heatflux-roundtrip',
  freecadVersion: native.freecadVersion,
  gitCommit: native.gitCommit,
  archives: {
    nativeInitial: { path: '.cache/freecad/property-heatflux-roundtrip/native-initial.FCStd', bytes: nativeBytes.byteLength, sha256: createHash('sha256').update(nativeBytes).digest('hex') },
    webEdited: { path: '.cache/freecad/property-heatflux-roundtrip/web-edited.FCStd', bytes: editedBytes.byteLength, sha256: createHash('sha256').update(editedBytes).digest('hex') },
    nativeResaved: { path: '.cache/freecad/property-heatflux-roundtrip/native-resaved.FCStd', bytes: resavedBytes.byteLength, sha256: createHash('sha256').update(resavedBytes).digest('hex') },
  },
  nativeInitial: native.result,
  web: {
    before: inspectedBefore.objects.find(({ name }) => name === 'HeatFluxProbe')?.properties.find(({ name }) => name === 'DFlux'),
    after: inspectedAfter.objects.find(({ name }) => name === 'HeatFluxProbe')?.properties.find(({ name }) => name === 'DFlux'),
    objectSetPreserved: inspectedBefore.objects.map(({ name, typeId }) => `${name}:${typeId}`).join('|') === inspectedAfter.objects.map(({ name, typeId }) => `${name}:${typeId}`).join('|'),
    semanticObjectsPreserved,
    opaquePathsPreserved: opaquePaths.length,
    opaqueEntriesPreserved,
  },
  nativeAfter: nativeAfter.result,
  classification: {
    webValue: Number(inspectedAfter.objects.find(({ name }) => name === 'HeatFluxProbe')?.properties.find(({ name }) => name === 'DFlux')?.value),
    reopenedValue: nativeAfter.result.reopened.heatFlux.property.value.numeric,
    resavedValue: nativeAfter.result.resaved.heatFlux.property.value.numeric,
    nativeValueMatches,
    unknownSemanticDrift: !(opaqueEntriesPreserved && semanticObjectsPreserved && nativeValueMatches),
    zeroUnknownDrift: opaqueEntriesPreserved && semanticObjectsPreserved && nativeValueMatches,
  },
}
await facade.project.dispose()
await writeFile(reportPath, `${JSON.stringify(report, null, 2)}\n`)
console.log(JSON.stringify({ status: report.status, output: 'config/freecad-property-heatflux-roundtrip.json', classification: report.classification, opaqueEntriesPreserved: report.web.opaqueEntriesPreserved }, null, 2))