import { build } from 'esbuild'
import { mkdtempSync, rmSync } from 'node:fs'
import { tmpdir } from 'node:os'
import { join, resolve } from 'node:path'
import { pathToFileURL } from 'node:url'

const root = resolve(import.meta.dirname, '../..')
const temporary = mkdtempSync(join(tmpdir(), 'orca-script-child-process-'))
const output = join(temporary, 'child-process.mjs')
let implementation

try {
  await build({
    stdin: {
      contents: [
        `export { runProcessSync, spawnProcess } from ${JSON.stringify(join(root, 'src/shared/child-process/run-process.ts'))}`
      ].join('\n'),
      resolveDir: root,
      sourcefile: 'script-child-process-entry.ts'
    },
    bundle: true,
    platform: 'node',
    target: 'node20',
    format: 'esm',
    outfile: output,
    logLevel: 'silent'
  })
  implementation = await import(pathToFileURL(output).href)
} finally {
  rmSync(temporary, { recursive: true, force: true })
}

export const runProcessSync = implementation.runProcessSync

export const spawnProcess = implementation.spawnProcess

/** Why a failed child failed, for CI logs where an empty stderr alone says nothing. */
export function describeProcessFailure(result) {
  const detail = [
    `code=${result.code ?? 'none'}`,
    `signal=${result.signal ?? 'none'}`,
    ...(result.timedOut ? ['timed out'] : []),
    ...(result.outputTruncated ? ['output truncated'] : [])
  ].join(' ')
  const stream = (name, text) => (text?.trim() ? `\n${name}:\n${text.trim().slice(-4000)}` : '')
  return `${detail}${stream('stdout', result.stdout)}${stream('stderr', result.stderr)}`
}