import { prisma } from '@/lib/prisma'
import { Prisma } from '@prisma/client'

export async function getOrCreateDeckForNotebook(params: {
  userId: string
  notebookId: string | null
  notebookName?: string | null
  manualName?: string
}) {
  const { userId, notebookId, notebookName, manualName } = params

  if (notebookId) {
    const existing = await prisma.flashcardDeck.findFirst({
      where: { userId, notebookId },
    })
    if (existing) return existing

    const notebook = await prisma.notebook.findFirst({
      where: { id: notebookId, userId },
      select: { name: true },
    })
    if (!notebook) {
      throw new Error('Notebook not found')
    }

    return prisma.flashcardDeck.create({
      data: {
        userId,
        notebookId,
        name: notebook.name,
      },
    }).catch(async (error) => {
      if (error instanceof Prisma.PrismaClientKnownRequestError && error.code === 'P2002') {
        const raced = await prisma.flashcardDeck.findFirst({
          where: { userId, notebookId },
        })
        if (raced) return raced
      }
      throw error
    })
  }

  const name = (manualName || notebookName || 'Deck').trim().slice(0, 120)
  if (!name) {
    throw new Error('Deck name required')
  }

  return prisma.flashcardDeck.create({
    data: {
      userId,
      name,
    },
  })
}

export function stripHtmlToText(html: string): string {
  return html
    .replace(/<script[\s\S]*?<\/script>/gi, ' ')
    .replace(/<style[\s\S]*?<\/style>/gi, ' ')
    .replace(/<[^>]+>/g, ' ')
    .replace(/&nbsp;/g, ' ')
    .replace(/\s+/g, ' ')
    .trim()
}