import { spawnSync } from 'node:child_process'
import { existsSync } from 'node:fs'
import { writeFile } from 'node:fs/promises'
import { resolve } from 'node:path'

const root = resolve(new URL('..', import.meta.url).pathname)
const executable = process.env.FREECAD_CMD || resolve(root, '.cache/freecad/install-desktop/bin/FreeCADCmd')
const pythonPath = resolve(root, '.cache/freecad/sysroot/usr/lib/python3/dist-packages')
const script = resolve(root, 'scripts/freecad-composite-history-elementmap-oracle.py')
const outputPath = resolve(root, 'config/freecad-composite-history-elementmap-oracle.json')
if (!existsSync(executable)) throw new Error(`FreeCAD composite oracle executable is missing: ${executable}`)
const execution = spawnSync(executable, ['--python-path', pythonPath, script], {
  cwd: root,
  encoding: 'utf8',
  timeout: 180_000,
  maxBuffer: 80 * 1024 * 1024,
  env: {
    ...process.env,
    PYTHONPATH: `${pythonPath}${process.env.PYTHONPATH ? `:${process.env.PYTHONPATH}` : ''}`,
    LD_LIBRARY_PATH: `${resolve(root, '.cache/freecad/sysroot/usr/lib/x86_64-linux-gnu')}${process.env.LD_LIBRARY_PATH ? `:${process.env.LD_LIBRARY_PATH}` : ''}`,
    MATPLOTLIBRC: resolve(root, '.cache/freecad/sysroot/etc/matplotlibrc'),
    MPLBACKEND: 'Agg',
  },
})
const output = `${execution.stdout || ''}\n${execution.stderr || ''}`
const marker = 'FREECAD_COMPOSITE_HISTORY_ELEMENTMAP_RESULT='
const markerIndex = output.indexOf(marker)
const payload = markerIndex >= 0 ? output.slice(markerIndex + marker.length).match(/\{.*\}/s)?.[0] : undefined
if (execution.error || execution.status !== 0 || !payload) throw new Error(`FreeCAD composite history oracle failed with status ${execution.status}: ${execution.error?.message || output.trim()}`)
const report = JSON.parse(payload)
await writeFile(outputPath, `${JSON.stringify(report, null, 2)}\n`)
console.log(JSON.stringify(report, null, 2))