// Reads a Rust-produced v1 update on stdin and asserts JS yjs decodes it to
// the expected text AND the expected formatting. This is the direction
// Task 3 cannot test. Plain text alone cannot distinguish a correct
// implementation from one that dropped formatting, so this also checks
// toDelta(), the way fixtures/generate.mjs's expected.json does.
import * as Y from 'yjs'
import assert from 'node:assert/strict'

const EXPECTED_TEXT = 'from rust 🦀 café'
const EXPECTED_DELTA = [
  { insert: 'from ' },
  { insert: 'rust', attributes: { bold: true } },
  { insert: ' 🦀 café' }
]

const chunks = []
for await (const chunk of process.stdin) chunks.push(chunk)
const update = new Uint8Array(Buffer.concat(chunks))

if (update.length === 0) {
  console.error('verify-rust: empty update on stdin')
  process.exit(1)
}

const doc = new Y.Doc()
Y.applyUpdate(doc, update)
const text = doc.getText('content')
const actualText = text.toString()
const actualDelta = text.toDelta()

try {
  assert.strictEqual(actualText, EXPECTED_TEXT)
  assert.deepStrictEqual(actualDelta, EXPECTED_DELTA)
} catch (err) {
  console.error('verify-rust: mismatch')
  console.error(`  text: expected ${JSON.stringify(EXPECTED_TEXT)}, got ${JSON.stringify(actualText)}`)
  console.error(`  delta: expected ${JSON.stringify(EXPECTED_DELTA)}, got ${JSON.stringify(actualDelta)}`)
  console.error(err.message)
  process.exit(1)
}

console.log(`verify-rust: ok (${update.length} bytes)`)