import { NextResponse } from "next/server"
import { z } from "zod"
import { requireUser } from "@/lib/authz"
import { promoteRecipe } from "@/lib/recipe-promotion"

/**
 * Promote a saved recipe into the collection so it can be rated, or onto the
 * wishlist to try later.
 *
 * All the logic lives in src/lib/recipe-promotion.ts, shared with the MCP tool.
 */
const bodySchema = z.object({
  target: z.enum(["drink", "wishlist"]),
})

export async function POST(
  request: Request,
  { params }: { params: { id: string } }
) {
  const session = await requireUser()
  if (session instanceof NextResponse) return session

  const parsed = bodySchema.safeParse(await request.json().catch(() => null))
  if (!parsed.success) {
    return NextResponse.json(
      { error: "target must be \"drink\" or \"wishlist\"" },
      { status: 400 }
    )
  }

  const result = await promoteRecipe(
    session.user.id,
    params.id,
    parsed.data.target
  )

  if (result.kind === "not_found") {
    return NextResponse.json({ error: "Not found" }, { status: 404 })
  }

  if (result.kind === "drink") {
    return NextResponse.json(
      { target: "drink", drink: result.drink, existing: result.existing },
      // 200 rather than 201 when it was already linked - nothing was created.
      { status: result.existing ? 200 : 201 }
    )
  }

  return NextResponse.json(
    { target: "wishlist", item: result.item, existing: result.existing },
    { status: result.existing ? 200 : 201 }
  )
}