import test from 'node:test'
import assert from 'node:assert/strict'
import { loadModule } from './load.mjs'

// Chat-Baustein (chat-composer.js/.css) wird zur Laufzeit vom Kundenportal geladen: eine Quelle fuer Portal und WOMS
const { loadChatComposer } = await loadModule('src/lib/loadChatComposer.js')

function fakeDoc() {
  const appended = []
  return {
    appended,
    head: { appendChild: (node) => { appended.push(node); return node } },
    createElement: (tag) => ({ tag, attrs: {}, setAttribute(k, v) { this.attrs[k] = v } }),
  }
}

test('haengt CSS und Skript einmal an und liefert window.ChatComposer', async () => {
  const doc = fakeDoc()
  const win = {}
  const first = loadChatComposer({ baseUrl: 'https://project.webklar.com', doc, win })
  const second = loadChatComposer({ baseUrl: 'https://project.webklar.com', doc, win })
  assert.equal(doc.appended.length, 2)
  const link = doc.appended.find((n) => n.tag === 'link')
  const script = doc.appended.find((n) => n.tag === 'script')
  assert.equal(link.href || link.attrs.href, 'https://project.webklar.com/chat-composer.css')
  assert.equal(link.rel || link.attrs.rel, 'stylesheet')
  assert.equal(script.src || script.attrs.src, 'https://project.webklar.com/chat-composer.js')
  win.ChatComposer = { create() {} }
  script.onload()
  assert.equal(await first, win.ChatComposer)
  assert.equal(await second, win.ChatComposer)
})

test('Skript laedt nicht -> deutsche Meldung, naechster Aufruf versucht es neu', async () => {
  const doc = fakeDoc()
  const win = {}
  const p = loadChatComposer({ baseUrl: 'https://p', doc, win })
  doc.appended.find((n) => n.tag === 'script').onerror()
  await assert.rejects(p, { message: 'Der Chat-Baustein konnte nicht geladen werden.' })
  loadChatComposer({ baseUrl: 'https://p', doc, win })
  assert.equal(doc.appended.filter((n) => n.tag === 'script').length, 2)
})

test('schon geladen (win.ChatComposer vorhanden) -> nichts anhaengen', async () => {
  const doc = fakeDoc()
  const win = { ChatComposer: { create() {} } }
  assert.equal(await loadChatComposer({ baseUrl: 'https://p', doc, win }), win.ChatComposer)
  assert.equal(doc.appended.length, 0)
})