import { writeFile } from 'node:fs/promises'
import path from 'node:path'
import esbuild from 'esbuild'

// Bundle createTerminalDocument() without host into an IIFE string for native WebView; page imports ordinary TS instead.
// IIFE isolates declarations. Keep source readable for crash reports/console; size is small relative to xterm engine.
const mobileRoot = path.join(import.meta.dirname, '..')

/** The oldest WebView Orca supports, matching the engine bundle's own floor (#7030). */
const TARGET = 'chrome74'

const ENTRY = path.join(mobileRoot, 'src', 'terminal', 'document', 'native-document-entry.ts')

export const TERMINAL_DOCUMENT_SCRIPT_PATH = path.join(
  mobileRoot,
  'src',
  'terminal',
  'terminal-webview-document-script.generated.ts'
)

const GENERATED_HEADER =
  `// Generated by scripts/build-terminal-document-script.mjs. Do not edit.\n` +
  `// The source is mobile/src/terminal/document/, bundled from native-document-entry.ts.\n` +
  `// Target: ${TARGET}. Regenerate via pnpm postinstall.`

// Share build options with census so it measures shipped output. Keep minify:false for useful window.onerror line/column.
// Pin absWorkingDir: esbuild’s module-path comments must be reproducible and must not expose builder home paths.
export function terminalDocumentBuildOptions(extra = {}) {
  return {
    absWorkingDir: mobileRoot,
    entryPoints: [ENTRY],
    bundle: true,
    format: 'iife',
    minify: false,
    platform: 'browser',
    target: TARGET,
    legalComments: 'none',
    write: false,
    logLevel: 'silent',
    ...extra
  }
}

// Return text and module census from one build so tests compare committed artifact against the sources that produced it.
export async function terminalDocumentBundle() {
  const result = await esbuild.build(terminalDocumentBuildOptions({ metafile: true }))
  const [output] = result.outputFiles
  if (!output) {
    throw new Error('[build-terminal-document-script] esbuild emitted no document bundle')
  }
  return { script: output.text.trimEnd(), inputs: Object.keys(result.metafile.inputs) }
}

export async function buildTerminalDocumentScript() {
  return (await terminalDocumentBundle()).script
}

async function main() {
  const script = await buildTerminalDocumentScript()
  await writeFile(
    TERMINAL_DOCUMENT_SCRIPT_PATH,
    `${GENERATED_HEADER}\nexport const TERMINAL_DOCUMENT_SCRIPT = ${JSON.stringify(script)}\n`
  )
}

if (process.argv[1] && import.meta.url.endsWith(path.basename(process.argv[1]))) {
  await main()
}