import { NextResponse } from "next/server"
import {
  getManualCitationContext,
  retrieveManualContext,
  summarizeManualRetrieval,
} from "@/lib/manuals-knowledge"
import { requireAdminToken } from "@/lib/server/admin-auth"

function normalizeQuery(value: string | null) {
  return (value || "").trim().slice(0, 400)
}

export async function GET(request: Request) {
  const authError = requireAdminToken(request)
  if (authError) {
    return authError
  }

  try {
    const { searchParams } = new URL(request.url)
    const query = normalizeQuery(searchParams.get("query"))
    const manufacturer = normalizeQuery(searchParams.get("manufacturer")) || null
    const model = normalizeQuery(searchParams.get("model")) || null
    const manualId = normalizeQuery(searchParams.get("manualId")) || null
    const pageParam = searchParams.get("page")
    const pageNumber =
      pageParam && Number.isFinite(Number(pageParam))
        ? Number.parseInt(pageParam, 10)
        : undefined

    if (!query) {
      return NextResponse.json(
        { error: "A query parameter is required." },
        { status: 400 }
      )
    }

    const result = await retrieveManualContext(query, {
      manufacturer,
      model,
      manualId,
    })
    const citationContext =
      manualId || result.bestManual?.manualId
        ? await getManualCitationContext(
            manualId || result.bestManual?.manualId || "",
            pageNumber
          )
        : null

    return NextResponse.json({
      query,
      filters: {
        manufacturer,
        model,
        manualId,
        pageNumber: pageNumber ?? null,
      },
      summary: summarizeManualRetrieval({
        ran: true,
        query,
        result,
      }),
      result,
      citationContext,
    })
  } catch (error) {
    console.error("Failed to inspect manuals knowledge:", error)
    return NextResponse.json(
      {
        error:
          error instanceof Error
            ? error.message
            : "Failed to inspect manuals knowledge",
      },
      { status: 500 }
    )
  }
}