import { describe, expect, it } from 'vitest'

import remarkWikiAutolink from '@/lib/remark-wiki-autolink'

import type { Root } from 'mdast'

import type { WikiAutolinkCandidate } from '@/types'


const candidate = (
    name: string,
    resourceId: number,
    overrides: Partial<WikiAutolinkCandidate> = {},
): WikiAutolinkCandidate => ({
    name, resourceId, tagId: resourceId + 100, tagDescriptionId: resourceId,
    resourceType: 'tag_description', languageCode: 'ja', localeCode: 'ain-Kana',
    ...overrides })


const paragraph = (value: string): Root => ({
    type: 'root', children: [{
	type: 'paragraph', children: [{ type: 'text', value }] }] })


describe ('remarkWikiAutolink', () => {
  it ('prefers longer names and keeps the viewing locale for Japanese text', () => {
    const tree = paragraph ('虹夏 and 虹')

    remarkWikiAutolink ([candidate ('虹', 1), candidate ('虹夏', 2)],
	'ja', 'ain-Kana') (tree)

    expect (tree.children[0]).toMatchObject ({
	children: [
	  { type: 'link', url: '/ain-Kana/wiki/2',
	    children: [{ type: 'text', value: '虹夏' }] },
	  { type: 'text', value: ' and ' },
	  { type: 'link', url: '/ain-Kana/wiki/1',
	    children: [{ type: 'text', value: '虹' }] }] })
  })

  it ('does not rewrite existing links, code or images', () => {
    const tree: Root = {
	type: 'root', children: [
	  { type: 'paragraph', children: [
	    { type: 'link', url: '/existing', children: [{ type: 'text', value: '虹' }] },
	    { type: 'inlineCode', value: '虹' },
	    { type: 'image', url: '/image', alt: '虹' }] },
	  { type: 'code', value: '虹' }] }
    const original = structuredClone (tree)

    remarkWikiAutolink ([candidate ('虹', 1)], 'ja', 'ain-Kana') (tree)

    expect (tree).toEqual (original)
  })

  it ('links an alias to its description rather than its tag ID or matched name', () => {
    const tree = paragraph ('別名')
    remarkWikiAutolink ([candidate ('別名', 9, { tagId: 123 })],
	'ja', 'ain-Kana') (tree)
    expect (tree.children[0]).toMatchObject ({
	children: [{ type: 'link', url: '/ain-Kana/wiki/9' }] })
  })

  it ('leaves ambiguous names and other locales or languages unlinked', () => {
    const tree = paragraph ('虹 名前 name')
    const original = structuredClone (tree)
    remarkWikiAutolink ([candidate ('虹', 1), candidate ('虹', 2),
	candidate ('名前', 3, { localeCode: 'ja' }),
	candidate ('name', 4, { languageCode: 'ain' })], 'ja', 'ain-Kana') (tree)
    expect (tree).toEqual (original)
  })

  it ('links Ainu words only at word boundaries', () => {
    const tree = paragraph ('チャペ　チャペ。チャペア')
    remarkWikiAutolink ([candidate ('チャペ', 5, { languageCode: 'ain' })],
	'ain', 'ain-Kana') (tree)
    expect (tree.children[0]).toMatchObject ({
	children: [
	  { type: 'link', url: '/ain-Kana/wiki/5' },
	  { type: 'text', value: '　' },
	  { type: 'link', url: '/ain-Kana/wiki/5' },
	  { type: 'text', value: '。チャペア' }] })
  })

  it ('preserves tag-group resource identity', () => {
    const tree = paragraph ('group')
    remarkWikiAutolink ([candidate ('group', 8, {
	resourceType: 'tag_group', tagId: null, tagDescriptionId: null })],
	'ja', 'ain-Kana') (tree)
    expect (tree.children[0]).toMatchObject ({
	children: [{ type: 'link', url: '/ain-Kana/wiki/8' }] })
  })
})