import { spawn } from 'node:child_process'
import type { ChildProcess } from 'node:child_process'
import { createRequire } from 'node:module'
import { hashPresenterToken } from './token.ts'

const require = createRequire(import.meta.url)
const slidevCli = require.resolve('@slidev/cli/bin/slidev.mjs')

interface RunSlidevOptions {
  env?: NodeJS.ProcessEnv
}

export function startSlidev(args: string[], options: RunSlidevOptions = {}) {
  const token = options.env?.PRESENTER_TOKEN ?? process.env.PRESENTER_TOKEN
  const presenterHash = token?.trim() ? hashPresenterToken(token) : ''
  return spawn(process.execPath, [slidevCli, ...args], {
    cwd: process.cwd(),
    env: {
      ...process.env,
      ...options.env,
      VITE_EASY_SLIDES_PRESENTER_HASH: presenterHash,
    },
    stdio: 'inherit',
  })
}

export async function waitForSlidev(child: ChildProcess) {
  await new Promise<void>((resolve, reject) => {
    child.once('error', reject)
    child.once('exit', (code, signal) => {
      if (code === 0)
        resolve()
      else
        reject(new Error(`Slidev 退出：${signal ?? `code ${code}`}`))
    })
  })
}

export async function runSlidev(args: string[], options: RunSlidevOptions = {}) {
  await waitForSlidev(startSlidev(args, options))
}