import { auth } from '@/auth'
import { db } from '@/lib/db'
import { sessionCodes, sessions, machines } from '@/lib/db/schema'
import { eq, and, isNull, gt } from 'drizzle-orm'
import { NextRequest, NextResponse } from 'next/server'

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

  const { code } = await request.json()
  if (!code || typeof code !== 'string') {
    return NextResponse.json({ error: 'Code required' }, { status: 400 })
  }

  const normalizedCode = code.replace(/\s/g, '').toUpperCase()

  // Find valid, unused session code
  const codeResult = await db
    .select()
    .from(sessionCodes)
    .where(
      and(
        eq(sessionCodes.code, normalizedCode),
        eq(sessionCodes.isActive, true),
        gt(sessionCodes.expiresAt, new Date()),
        isNull(sessionCodes.usedAt)
      )
    )
    .limit(1)

  const sessionCode = codeResult[0]
  if (!sessionCode) {
    return NextResponse.json({ error: 'Invalid or expired session code' }, { status: 400 })
  }

  // Look up machine name
  const machineResult = await db
    .select({ name: machines.name })
    .from(machines)
    .where(eq(machines.id, sessionCode.machineId))
    .limit(1)

  const machineName = machineResult[0]?.name ?? 'Remote Machine'

  // Mark code as used
  await db
    .update(sessionCodes)
    .set({ usedAt: new Date(), usedBy: session.user.id, isActive: false })
    .where(eq(sessionCodes.id, sessionCode.id))

  // Create session record (viewer_token is auto-generated by DB default)
  const newSession = await db
    .insert(sessions)
    .values({
      machineId: sessionCode.machineId,
      machineName,
      viewerUserId: session.user.id,
      connectionType: 'session_code',
      sessionCode: normalizedCode,
    })
    .returning({ id: sessions.id, viewerToken: sessions.viewerToken })

  return NextResponse.json({
    sessionId: newSession[0].id,
    viewerToken: newSession[0].viewerToken,
    machineId: sessionCode.machineId,
  })
}