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

/**
 * Admin endpoint to validate all pgvector embeddings in the database.
 * Uses native SQL to check for valid vector format.
 */
export async function GET() {
  try {
    const session = await auth()
    if (!session?.user?.id) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    const user = await prisma.user.findUnique({
      where: { id: session.user.id },
      select: { role: true }
    })

    if (!user || user.role !== 'ADMIN') {
      return NextResponse.json({ error: 'Forbidden - Admin only' }, { status: 403 })
    }

    const totalResult: Array<{ total: bigint }> = await prisma.$queryRawUnsafe(
      `SELECT COUNT(*)::bigint as total FROM "Note" WHERE "trashedAt" IS NULL`
    )
    const total = Number(totalResult[0]?.total ?? 0)

    const withEmbedding: Array<{ count: bigint }> = await prisma.$queryRawUnsafe(
      `SELECT COUNT(*)::bigint as count FROM "NoteEmbedding"`
    )
    const validCount = Number(withEmbedding[0]?.count ?? 0)

    const invalidResult: Array<{ count: bigint }> = await prisma.$queryRawUnsafe(
      `SELECT COUNT(*)::bigint as count FROM "NoteEmbedding" e
       WHERE e."embedding" IS NULL
          OR array_length(string_to_array(replace(replace(e."embedding"::text, '[', ''), ']', ''), ','), 1) != 2560`
    )
    const invalidCount = Number(invalidResult[0]?.count ?? 0)

    const missingCount = total - validCount

    return NextResponse.json({
      success: true,
      summary: {
        total,
        valid: validCount - invalidCount,
        missing: missingCount > 0 ? missingCount : 0,
        invalid: invalidCount
      },
      invalidNotes: []
    })
  } catch (error) {
    console.error('[EMBEDDING_VALIDATION] Error:', error)
    return NextResponse.json(
      { success: false, error: String(error) },
      { status: 500 }
    )
  }
}