import { NextRequest, NextResponse } from 'next/server'
import { auth } from '@/auth'
import prisma from '@/lib/prisma'

export async function GET(
  _request: NextRequest,
  { params }: { params: Promise<{ id: string }> },
) {
  try {
    const session = await auth()
    if (!session?.user?.id) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    const { id: notebookId } = await params
    const site = await prisma.notebookSite.findUnique({
      where: { notebookId },
      select: { slug: true, isPublic: true, publishedAt: true, template: true, selectedNoteIds: true },
    })
    return NextResponse.json({ site: site || null })
  } catch (error: any) {
    return NextResponse.json({ error: error.message }, { status: 500 })
  }
}

function toSlug(str: string): string {
  return str
    .toLowerCase()
    .normalize('NFD').replace(/[\u0300-\u036f]/g, '')
    .replace(/[^a-z0-9\s-]/g, '')
    .trim()
    .replace(/\s+/g, '-')
    .replace(/-+/g, '-')
    .slice(0, 40)
}

function generateNotebookSlug(name: string): string {
  const base = toSlug(name) || 'carnet'
  const suffix = Math.random().toString(36).slice(2, 7)
  return `${base}-${suffix}`
}

export async function POST(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> },
) {
  try {
    const session = await auth()
    if (!session?.user?.id) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    const { id: notebookId } = await params
    const { selectedNoteIds, template, description } = await request.json()

    if (!selectedNoteIds || !Array.isArray(selectedNoteIds) || selectedNoteIds.length === 0) {
      return NextResponse.json({ error: 'selectedNoteIds is required' }, { status: 400 })
    }

    const notebook = await prisma.notebook.findFirst({
      where: { id: notebookId, userId: session.user.id, trashedAt: null },
      select: { id: true, name: true, site: { select: { slug: true } } },
    })
    if (!notebook) return NextResponse.json({ error: 'Notebook not found' }, { status: 404 })

    // Reuse existing slug or generate a new one
    const slug = notebook.site?.slug || generateNotebookSlug(notebook.name)

    const site = await prisma.notebookSite.upsert({
      where: { notebookId },
      create: {
        notebookId,
        slug,
        isPublic: true,
        template: template || 'magazine',
        selectedNoteIds: JSON.stringify(selectedNoteIds),
        description: description || null,
      },
      update: {
        isPublic: true,
        template: template || 'magazine',
        selectedNoteIds: JSON.stringify(selectedNoteIds),
        description: description || null,
        updatedAt: new Date(),
      },
    })

    return NextResponse.json({ slug: site.slug, url: `/c/${site.slug}` })
  } catch (error: any) {
    console.error('[notebooks/publish] Error:', error)
    return NextResponse.json({ error: error.message || 'Failed to publish' }, { status: 500 })
  }
}

export async function DELETE(
  _request: NextRequest,
  { params }: { params: Promise<{ id: string }> },
) {
  try {
    const session = await auth()
    if (!session?.user?.id) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    const { id: notebookId } = await params

    const notebook = await prisma.notebook.findFirst({
      where: { id: notebookId, userId: session.user.id },
      select: { id: true },
    })
    if (!notebook) return NextResponse.json({ error: 'Not found' }, { status: 404 })

    await prisma.notebookSite.deleteMany({ where: { notebookId } })

    return NextResponse.json({ success: true })
  } catch (error: any) {
    return NextResponse.json({ error: error.message }, { status: 500 })
  }
}