import test from 'brittle'
import { readFile } from 'node:fs/promises'
import { dirname, join } from 'node:path'
import { fileURLToPath } from 'node:url'

const __dirname = dirname(fileURLToPath(import.meta.url))

async function load() {
  const src = await readFile(join(__dirname, '../lib/irc/irc-parse.js'), 'utf8')
  const hook = {}
  new Function(
    'exports',
    src +
      '\nexports.bareIrcParseMessage = bareIrcParseMessage;\nexports.bareIrcSerializeMessage = bareIrcSerializeMessage;\nexports.bareIrcCasemap = bareIrcCasemap;\nexports.bareIrcEqual = bareIrcEqual;\nexports.bareIrcCreateLineBuffer = bareIrcCreateLineBuffer;\n'
  )(hook)
  return hook
}

test('parse spec golden PRIVMSG with tags', async (t) => {
  const h = await load()
  const m = h.bareIrcParseMessage(
    "@id=234AB :dan!d@localhost PRIVMSG #chan :Hey what's up!"
  )
  t.is(m.tags.id, '234AB')
  t.is(m.nick, 'dan')
  t.is(m.user, 'd')
  t.is(m.host, 'localhost')
  t.is(m.command, 'PRIVMSG')
  t.alike(m.params, ['#chan', "Hey what's up!"])
})

test('trailing smiley and empty LIST', async (t) => {
  const h = await load()
  const smile = h.bareIrcParseMessage(':dan!d@localhost PRIVMSG #chan ::-)')
  t.alike(smile.params, ['#chan', ':-)'])
  const empty = h.bareIrcParseMessage(':irc.example.com CAP * LIST :')
  t.alike(empty.params, ['*', 'LIST', ''])
})

test('serialize then parse round-trip', async (t) => {
  const h = await load()
  const line = h.bareIrcSerializeMessage({
    command: 'PRIVMSG',
    params: ['#chan', 'hello world']
  })
  t.ok(line.endsWith('\r\n'))
  const m = h.bareIrcParseMessage(line)
  t.alike(m.params, ['#chan', 'hello world'])
})

test('rfc1459 casemap', async (t) => {
  const h = await load()
  t.ok(h.bareIrcEqual('Dan', 'dan', 'rfc1459'))
  t.ok(h.bareIrcEqual('[foo]', '{foo}', 'rfc1459'))
  t.absent(h.bareIrcEqual('[foo]', '{foo}', 'ascii'))
})

test('line buffer splits CRLF and lone LF', async (t) => {
  const h = await load()
  const b = h.bareIrcCreateLineBuffer()
  t.alike(b.push('PING :x\r\nPONG :y\n'), ['PING :x', 'PONG :y'])
})