export const isValidYoutubeUrl = (url: string) => {
  return url.match(/^(https?:\/\/)?(www\.|music\.)?(youtube\.com|youtu\.be)(.+)?$/)
}

export interface GetEmbedUrlOptions {
  url: string;
  controls?: boolean;
  nocookie?: boolean;
  startAt?: number;
}

export const getYoutubeEmbedUrl = (nocookie?: boolean) => {
  return nocookie ? 'https://www.youtube-nocookie.com/embed/' : 'https://www.youtube.com/embed/'
}

export const getEmbedURLFromYoutubeURL = (options: GetEmbedUrlOptions) => {
  const {
    url,
    controls,
    nocookie,
    startAt,
  } = options

  // if is already an embed url, return it
  if (url.includes('/embed/')) {
    return url
  }

  // if is a youtu.be url, get the id after the /
  if (url.includes('youtu.be')) {
    const id = url.split('/').pop()

    if (!id) {
      return null
    }
    return `${getYoutubeEmbedUrl(nocookie)}${id}`
  }

  const videoIdRegex = /v=([-\w]+)/gm
  const matches = videoIdRegex.exec(url)

  if (!matches || !matches[1]) {
    return null
  }

  let outputUrl = `${getYoutubeEmbedUrl(nocookie)}${matches[1]}`

  const params = []

  if (!controls) {
    params.push('controls=0')
  }

  if (startAt) {
    params.push(`start=${startAt}`)
  }

  if (params.length) {
    outputUrl += `?${params.join('&')}`
  }

  return outputUrl
}