import assert from 'node:assert/strict'
import test from 'node:test'
import { selectSubtree } from '../src/page-selection.js'
import { normalizeBaseUrl } from '../src/utils.js'

const base = normalizeBaseUrl('https://wiki.example.com')

const pages = [
  { id: 1, path: 'docs', locale: 'en', title: 'Docs', isPublished: true },
  { id: 2, path: 'docs/fallback', locale: 'en', title: 'Fallback', isPublished: true },
  { id: 3, path: 'docs/install', locale: 'en', title: 'Install', isPublished: true },
  { id: 4, path: 'docs/install/linux', locale: 'en', title: 'Linux', isPublished: true },
  { id: 5, path: 'docs/other', locale: 'en', title: 'Other', isPublished: true },
  { id: 6, path: 'docs/draft', locale: 'en', title: 'Draft', isPublished: false },
  { id: 7, path: 'docs-other', locale: 'en', title: 'Excluded sibling', isPublished: true },
  { id: 8, path: 'guide', locale: 'en', title: 'Guide', isPublished: true },
]

test('selects the starting page and path descendants, not similarly named siblings', () => {
  const result = selectSubtree({
    pages,
    baseUrl: base,
    startPage: 'docs',
    locale: 'en',
  })

  assert.equal(result.locale, 'en')
  assert.equal(result.startPath, 'docs')
  assert.deepEqual(
    result.pages.map((page) => page.path),
    ['docs', 'docs/fallback', 'docs/install', 'docs/install/linux', 'docs/other'],
  )
  assert.deepEqual(
    result.pages.map((page) => page.depth),
    [0, 1, 1, 2, 1],
  )
  assert.equal(result.omittedUnpublished, 1)
})

test('can include unpublished descendants explicitly', () => {
  const result = selectSubtree({
    pages,
    baseUrl: base,
    startPage: 'docs',
    locale: 'en',
    includeUnpublished: true,
  })

  assert.ok(result.pages.some((page) => page.path === 'docs/draft'))
  assert.equal(result.omittedUnpublished, 0)
})

test('accepts a full Wiki.js page URL with a locale prefix', () => {
  const result = selectSubtree({
    pages,
    baseUrl: base,
    startPage: 'https://wiki.example.com/en/docs/install/',
  })

  assert.equal(result.startPath, 'docs/install')
  assert.deepEqual(
    result.pages.map((page) => page.path),
    ['docs/install', 'docs/install/linux'],
  )
})

test('handles a wiki hosted below a URL subpath', () => {
  const subpathBase = normalizeBaseUrl('https://example.com/wiki/')
  const subpathPages = pages.map((page) => ({ ...page }))
  const result = selectSubtree({
    pages: subpathPages,
    baseUrl: subpathBase,
    startPage: 'https://example.com/wiki/en/docs/install',
  })

  assert.equal(result.startPath, 'docs/install')
  assert.deepEqual(
    result.pages.map((page) => page.path),
    ['docs/install', 'docs/install/linux'],
  )
})

test('accepts a path with a locale prefix', () => {
  const result = selectSubtree({
    pages,
    baseUrl: base,
    startPage: '/en/docs',
  })

  assert.equal(result.startPath, 'docs')
  assert.equal(result.pages.length, 5)
})

test('reports ambiguous locales and honors a default locale', () => {
  const multilingual = [
    ...pages,
    { id: 20, path: 'docs', locale: 'de', title: 'Doku', isPublished: true },
  ]

  assert.throws(
    () =>
      selectSubtree({
        pages: multilingual,
        baseUrl: base,
        startPage: 'docs',
      }),
    /multiple locales/,
  )

  const result = selectSubtree({
    pages: multilingual,
    baseUrl: base,
    startPage: 'docs',
    defaultLocale: 'de',
  })
  assert.equal(result.locale, 'de')
  assert.deepEqual(
    result.pages.map((page) => page.path),
    ['docs'],
  )
})

test('reports a missing starting page and unknown locales', () => {
  assert.throws(
    () => selectSubtree({ pages, baseUrl: base, startPage: 'missing', locale: 'en' }),
    /was not found/,
  )

  assert.throws(
    () => selectSubtree({ pages, baseUrl: base, startPage: 'docs', locale: 'fr' }),
    /Locale "fr" does not exist/,
  )
})

test('enforces the page limit', () => {
  assert.throws(
    () =>
      selectSubtree({
        pages,
        baseUrl: base,
        startPage: 'docs',
        locale: 'en',
        maxPages: 2,
      }),
    /above the configured limit/,
  )
})

test('maps the root URL to Wiki.js home', () => {
  const homePages = [
    { id: 1, path: 'home', locale: 'en', title: 'Home', isPublished: true },
    { id: 2, path: 'home/child', locale: 'en', title: 'Child', isPublished: true },
  ]
  const result = selectSubtree({
    pages: homePages,
    baseUrl: base,
    startPage: 'https://wiki.example.com/en/',
  })

  assert.equal(result.startPath, 'home')
  assert.deepEqual(
    result.pages.map((page) => page.path),
    ['home', 'home/child'],
  )
})