import fs from 'fs'
import path from 'path'
import { NextRequest, NextResponse } from 'next/server'
import { getLibrary, resolveLibraryRoot, resolveAndJail } from '@/lib/libraries'
import { scanTvLibrary, scanTvSeasons, scanTvEpisodes } from '@/lib/tv'
import { removeAllAssignmentsForItem } from '@/lib/tags'
import { requireLibraryAccess, requireAdmin } from '@/lib/auth'

export async function GET(request: NextRequest) {
  const { searchParams } = request.nextUrl
  const libraryId = searchParams.get('libraryId')
  const seriesId = searchParams.get('seriesId')
  const seasonId = searchParams.get('seasonId')

  if (!libraryId) {
    return NextResponse.json({ error: 'Missing libraryId' }, { status: 400 })
  }

  const auth = await requireLibraryAccess(request, libraryId)
  if (auth instanceof NextResponse) return auth

  const library = getLibrary(libraryId)
  if (!library) {
    return NextResponse.json({ error: 'Library not found' }, { status: 404 })
  }
  if (library.type !== 'tv') {
    return NextResponse.json({ error: 'Library is not a TV library' }, { status: 400 })
  }

  const root = resolveLibraryRoot(library)

  if (seriesId && seasonId) {
    const episodes = scanTvEpisodes(root, libraryId, seriesId, seasonId)
    return NextResponse.json(episodes)
  }

  if (seriesId) {
    const seasons = scanTvSeasons(root, libraryId, seriesId)
    return NextResponse.json(seasons)
  }

  const series = scanTvLibrary(root, libraryId)
  return NextResponse.json(series)
}

export async function DELETE(request: NextRequest) {
  const auth = await requireAdmin(request)
  if (auth instanceof NextResponse) return auth

  const { searchParams } = request.nextUrl
  const libraryId = searchParams.get('libraryId')
  const seriesId = searchParams.get('seriesId')

  if (!libraryId || !seriesId) {
    return NextResponse.json({ error: 'Missing libraryId or seriesId' }, { status: 400 })
  }

  const library = getLibrary(libraryId)
  if (!library) {
    return NextResponse.json({ error: 'Library not found' }, { status: 404 })
  }
  if (library.type !== 'tv') {
    return NextResponse.json({ error: 'Library is not a TV library' }, { status: 400 })
  }

  const root = resolveLibraryRoot(library)
  const dirName = decodeURIComponent(seriesId)

  let seriesDir: string
  try {
    seriesDir = resolveAndJail(root, dirName)
  } catch {
    return NextResponse.json({ error: 'Invalid series path' }, { status: 400 })
  }

  try {
    fs.rmSync(seriesDir, { recursive: true, force: true })
  } catch {
    return NextResponse.json({ error: 'Failed to delete series directory' }, { status: 500 })
  }

  removeAllAssignmentsForItem(`${libraryId}:${seriesId}`)

  return new NextResponse(null, { status: 204 })
}