import type { Highlighter, BundledLanguage } from 'shiki'

export const EXTERNAL_URL_RE = /^[a-z]+:/i
export const PATHNAME_PROTOCOL_RE = /^pathname:\/\//
export const APPEARANCE_KEY = 'vitepress-theme-appearance'
export const HASH_RE = /#.*$/
export const EXT_RE = /(index)?\.(md|html)$/

export const inBrowser = typeof document !== 'undefined'

export interface Header {
  /**
   * The level of the header
   *
   * `1` to `6` for `<h1>` to `<h6>`
   */
  level: number
  /**
   * The title of the header
   */
  title: string
  /**
   * The slug of the header
   *
   * Typically the `id` attr of the header anchor
   */
  slug: string
  /**
   * Link of the header
   *
   * Typically using `#${slug}` as the anchor hash
   */
  link: string
  /**
   * The children of the header
   */
  children: Header[]
}

export function isActive(currentPath: string, matchPath?: string, asRegex: boolean = false): boolean {
  if (matchPath === undefined) {
    return false
  }

  currentPath = normalize(`/${currentPath}`)

  if (asRegex) {
    return new RegExp(matchPath).test(currentPath)
  }

  if (normalize(matchPath) !== currentPath) {
    return false
  }

  const hashMatch = matchPath.match(HASH_RE)

  if (hashMatch) {
    return (inBrowser ? location.hash : '') === hashMatch[0]
  }

  return true
}

export function normalize(path: string): string {
  return decodeURI(path).replace(HASH_RE, '').replace(EXT_RE, '')
}

export function isExternal(path: string): boolean {
  return EXTERNAL_URL_RE.test(path)
}

// https://github.com/rollup/rollup/blob/fec513270c6ac350072425cc045db367656c623b/src/utils/sanitizeFileName.ts

const INVALID_CHAR_REGEX = /[\u0000-\u001F"#$&*+,:;<=>?[\]^`{|}\u007F]/g
const DRIVE_LETTER_REGEX = /^[a-z]:/i

export function sanitizeFileName(name: string): string {
  const match = DRIVE_LETTER_REGEX.exec(name)
  const driveLetter = match ? match[0] : ''

  return (
    driveLetter +
    name
      .slice(driveLetter.length)
      .replace(INVALID_CHAR_REGEX, '_')
      .replace(/(^|\/)_+(?=[^/]*$)/, '$1')
  )
}

export interface HighlightPlugin {
  plugin: (str: string, lang: string, attrs: string) => string
  highlighter: Highlighter
  loadLang: (lang: BundledLanguage) => Promise<void>
}

export const MarkdownSymbol = Symbol('vue-md-shiki-component')

export const getLangs = () => {
  return [
    'abap',
    'actionscript-3',
    'ada',
    'apache',
    'apex',
    'apl',
    'applescript',
    'ara',
    'asm',
    'astro',
    'awk',
    'ballerina',
    'bat',
    'batch',
    'berry',
    'be',
    'bibtex',
    'bicep',
    'blade',
    'c',
    'cadence',
    'cdc',
    'clarity',
    'clojure',
    'clj',
    'cmake',
    'cobol',
    'codeql',
    'ql',
    'coffee',
    'cpp',
    'c++',
    'crystal',
    'csharp',
    'c#',
    'cs',
    'css',
    'cue',
    'd',
    'dart',
    'dax',
    'diff',
    'docker',
    'dockerfile',
    'dream-maker',
    'elixir',
    'elm',
    'erb',
    'erlang',
    'erl',
    'fish',
    'fsharp',
    'f#',
    'fs',
    'gdresource',
    'gdscript',
    'gdshader',
    'gherkin',
    'git-commit',
    'git-rebase',
    'glsl',
    'gnuplot',
    'go',
    'golang',
    'graphql',
    'groovy',
    'hack',
    'haml',
    'handlebars',
    'hbs',
    'haskell',
    'hs',
    'hcl',
    'hlsl',
    'html',
    'http',
    'imba',
    'ini',
    'properties',
    'java',
    'javascript',
    'js',
    'jinja-html',
    'jison',
    'json',
    'json5',
    'jsonc',
    'jsonnet',
    'jssm',
    'fsl',
    'jsx',
    'julia',
    'kotlin',
    'kusto',
    'kql',
    'latex',
    'less',
    'liquid',
    'lisp',
    'logo',
    'lua',
    'make',
    'makefile',
    'markdown',
    'md',
    'marko',
    'matlab',
    'mdx',
    'mermaid',
    'nginx',
    'nim',
    'nix',
    'objective-c',
    'objc',
    'objective-cpp',
    'ocaml',
    'pascal',
    'perl',
    'php',
    'plsql',
    'postcss',
    'powerquery',
    'powershell',
    'ps',
    'ps1',
    'prisma',
    'prolog',
    'proto',
    'pug',
    'jade',
    'puppet',
    'purescript',
    'python',
    'py',
    'r',
    'raku',
    'perl6',
    'razor',
    'reg',
    'rel',
    'riscv',
    'rst',
    'ruby',
    'rb',
    'rust',
    'rs',
    'sas',
    'sass',
    'scala',
    'scheme',
    'scss',
    'shaderlab',
    'shader',
    'shellscript',
    'bash',
    'console',
    'sh',
    'shell',
    'zsh',
    'smalltalk',
    'solidity',
    'sparql',
    'sql',
    'ssh-config',
    'stata',
    'stylus',
    'styl',
    'svelte',
    'swift',
    'system-verilog',
    'tasl',
    'tcl',
    'tex',
    'toml',
    'tsx',
    'turtle',
    'twig',
    'typescript',
    'ts',
    'v',
    'vb',
    'cmd',
    'verilog',
    'vhdl',
    'viml',
    'vim',
    'vimscript',
    'vue-html',
    'vue',
    'wasm',
    'wenyan',
    '文言',
    'wgsl',
    'xml',
    'xsl',
    'yaml',
    'yml',
    'zenscript',
    ...Object.keys(transform)
  ]
}

export const transform: Record<string, string> = {
  'c++': 'cpp',
  'c#': 'csharp',
  cs: 'csharp',
  golang: 'go'
}