import assert from 'node:assert/strict'
import test from 'node:test'
import { mergeGraph } from '../app/utils/graph.ts'

const cms = {
  '@context': 'https://schema.org',
  '@graph': [
    { '@type': 'WebPage', '@id': 'https://acme.test/x#webpage', name: 'CMS name' },
    { '@type': 'Organization', '@id': 'https://acme.test/#org', name: 'Acme' },
  ],
}

test('mergeGraph: a layer node with a CMS @id merges into it, CMS values first', () => {
  const g = mergeGraph(cms, [{ '@id': 'https://acme.test/x#webpage', name: 'Layer name', inLanguage: 'pl' }])
  assert.ok(g)
  assert.equal(g['@graph'].length, 2)
  assert.deepEqual(g['@graph'][0], { '@id': 'https://acme.test/x#webpage', name: 'CMS name', inLanguage: 'pl', '@type': 'WebPage' })
})

test('mergeGraph: a node with a new @id or none is appended, in order', () => {
  const g = mergeGraph(cms, [{ '@type': 'ItemList', '@id': 'https://acme.test/x#itemlist' }, { '@type': 'Thing' }])
  assert.ok(g)
  assert.deepEqual(
    g['@graph'].map((n) => n['@type']),
    ['WebPage', 'Organization', 'ItemList', 'Thing'],
  )
})

test('mergeGraph: no duplicate @id, also within the CMS graph and among layer nodes', () => {
  const g = mergeGraph({ '@graph': [{ '@id': 'a', x: 1 }, { '@id': 'a', y: 2 }] }, [{ '@id': 'a', z: 3 }, { '@id': 'b' }, { '@id': 'b', w: 4 }])
  assert.ok(g)
  const ids = g['@graph'].map((n) => n['@id'])
  assert.deepEqual(ids, ['a', 'b'])
  assert.deepEqual(g['@graph'][0], { '@id': 'a', x: 1, y: 2, z: 3 })
  assert.deepEqual(g['@graph'][1], { '@id': 'b', w: 4 })
})

test('mergeGraph: one context, nested @context removed from nodes', () => {
  const g = mergeGraph(null, [{ '@context': 'https://schema.org', '@type': 'FAQPage', '@id': 'f' }])
  assert.ok(g)
  assert.equal(g['@context'], 'https://schema.org')
  assert.deepEqual(g['@graph'], [{ '@type': 'FAQPage', '@id': 'f' }])
})

test('mergeGraph: a single-node jsonld counts as one node', () => {
  const g = mergeGraph({ '@context': 'https://schema.org', '@type': 'WebSite', '@id': 'w' }, [])
  assert.deepEqual(g, { '@context': 'https://schema.org', '@graph': [{ '@type': 'WebSite', '@id': 'w' }] })
})

test('mergeGraph: nothing to emit is null (no JSON-LD script)', () => {
  assert.equal(mergeGraph(null, []), null)
  assert.equal(mergeGraph(undefined), null)
  assert.equal(mergeGraph({ '@graph': [] }, [null, 'x', 3]), null)
  assert.equal(mergeGraph('nope', []), null)
})

test('mergeGraph: inputs are not mutated', () => {
  const input = JSON.parse(JSON.stringify(cms))
  const node = { '@id': 'https://acme.test/x#webpage', extra: true }
  mergeGraph(input, [node])
  assert.deepEqual(input, cms)
  assert.deepEqual(node, { '@id': 'https://acme.test/x#webpage', extra: true })
})