import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { and, eq } from "@epicure/db";
import { db, recipes } from "@epicure/db";
import { requireSession } from "@/lib/api-auth";
import { checkAndIncrementTierLimit } from "@/lib/tiers";
import { suggestDrinks } from "@/lib/ai/features/suggest-drinks";
import { withUserKey } from "@/lib/ai/resolve-user-key";
import { getUserPrivateBio } from "@/lib/ai/user-bio";

const Schema = z.object({
  count: z.number().int().min(1).max(6).default(4),
  provider: z.enum(["openai", "anthropic", "openrouter", "ollama"]).optional(),
  model: z.string().optional(),
});

type Params = { params: Promise<{ id: string }> };

export async function POST(req: NextRequest, { params }: Params) {
  const { session, response } = await requireSession();
  if (response) return response;

  const { id } = await params;

  const recipe = await db.query.recipes.findFirst({
    where: and(eq(recipes.id, id)),
    with: { ingredients: true },
  });
  if (!recipe || (recipe.visibility === "private" && recipe.authorId !== session!.user.id)) {
    return NextResponse.json({ error: "Not found" }, { status: 404 });
  }

  const body = await req.json() as unknown;
  const parsed = Schema.safeParse(body ?? {});
  if (!parsed.success) return NextResponse.json({ error: "Validation error" }, { status: 400 });

  await checkAndIncrementTierLimit(session!.user.id, session!.user.tier as "free" | "pro", "aiCall");

  const [aiConfig, privateBio] = await Promise.all([
    withUserKey(session!.user.id, { provider: parsed.data.provider, model: parsed.data.model }),
    getUserPrivateBio(session!.user.id),
  ]);
  const drinks = await suggestDrinks(
    {
      title: recipe.title,
      description: recipe.description,
      difficulty: recipe.difficulty,
      dietaryTags: recipe.dietaryTags as Record<string, boolean> | null,
      ingredients: recipe.ingredients,
    },
    parsed.data.count,
    { ...aiConfig, userContext: privateBio ?? undefined },
    (session!.user as { locale?: string }).locale ?? "en"
  );

  return NextResponse.json({ drinks });
}