import type { PlaylistMetadata, SelectableVideoMetadata, VideoMetadata } from '../types/media'

export function detectMixUrl(url: string): boolean {
  return url.includes('v=') && url.includes('list=')
}

export function stripPlaylistContext(rawUrl: string): string {
  try {
    const url = new URL(rawUrl)
    url.searchParams.delete('list')
    url.searchParams.delete('index')
    url.searchParams.delete('start_radio')
    return url.toString()
  } catch {
    return rawUrl
      .replace(/[?&]list=[^&]+/g, '')
      .replace(/[?&]index=[^&]+/g, '')
      .replace(/[?&]start_radio=[^&]+/g, '')
      .replace('?&', '?')
      .replace(/&&+/g, '&')
      .replace(/[?&]$/, '')
  }
}

export function isLikelyHttpUrl(input: string): boolean {
  return input.startsWith('http://') || input.startsWith('https://')
}

export function normalizeBatchLinks(input: string): string[] {
  return input
    .split('\n')
    .map(line => line.trim())
    .filter(Boolean)
    .filter(isLikelyHttpUrl)
    .filter(link => !link.includes('list=') || detectMixUrl(link))
    .map(link => detectMixUrl(link) ? stripPlaylistContext(link) : link)
}

export function toSelectableEntries(entries: VideoMetadata[]): SelectableVideoMetadata[] {
  return entries.map(entry => ({ ...entry, selected: true }))
}

export function countSelectedEntries(metadata: PlaylistMetadata | null): number {
  return metadata?.entries.filter(entry => entry.selected).length ?? 0
}