import { NULL_BYTE_PLACEHOLDER, VALID_ID_PREFIX } from './constants'

export const isWindows: boolean =
  typeof process !== 'undefined' && process.platform === 'win32'

/**
 * Prepend `/@id/` and replace null byte so the id is URL-safe.
 * This is prepended to resolved ids that are not valid browser
 * import specifiers by the importAnalysis plugin.
 */
export function wrapId(id: string): string {
  return id.startsWith(VALID_ID_PREFIX)
    ? id
    : VALID_ID_PREFIX + id.replace('\0', NULL_BYTE_PLACEHOLDER)
}

/**
 * Undo {@link wrapId}'s `/@id/` and null byte replacements.
 */
export function unwrapId(id: string): string {
  return id.startsWith(VALID_ID_PREFIX)
    ? id.slice(VALID_ID_PREFIX.length).replace(NULL_BYTE_PLACEHOLDER, '\0')
    : id
}

const windowsSlashRE = /\\/g
export function slash(p: string): string {
  return p.replace(windowsSlashRE, '/')
}

const postfixRE = /[?#].*$/
export function cleanUrl(url: string): string {
  return url.replace(postfixRE, '')
}

export function splitFileAndPostfix(path: string): {
  file: string
  postfix: string
} {
  const file = cleanUrl(path)
  return { file, postfix: path.slice(file.length) }
}

export function isPrimitive(value: unknown): boolean {
  return !value || (typeof value !== 'object' && typeof value !== 'function')
}

export function withTrailingSlash(path: string): string {
  if (path[path.length - 1] !== '/') {
    return `${path}/`
  }
  return path
}

// eslint-disable-next-line @typescript-eslint/no-empty-function
export const AsyncFunction = async function () {}.constructor as typeof Function

// https://github.com/nodejs/node/issues/43047#issuecomment-1564068099
let asyncFunctionDeclarationPaddingLineCount: number | undefined

export function getAsyncFunctionDeclarationPaddingLineCount(): number {
  if (typeof asyncFunctionDeclarationPaddingLineCount === 'undefined') {
    const body = '/*code*/'
    const source = new AsyncFunction('a', 'b', body).toString()
    asyncFunctionDeclarationPaddingLineCount =
      source.slice(0, source.indexOf(body)).split('\n').length - 1
  }
  return asyncFunctionDeclarationPaddingLineCount
}

export interface PromiseWithResolvers<T> {
  promise: Promise<T>
  resolve: (value: T | PromiseLike<T>) => void
  reject: (reason?: any) => void
}
export function promiseWithResolvers<T>(): PromiseWithResolvers<T> {
  let resolve: any
  let reject: any
  const promise = new Promise<T>((_resolve, _reject) => {
    resolve = _resolve
    reject = _reject
  })
  return { promise, resolve, reject }
}