import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { db, recipes, ratings, eq, and } from "@epicure/db";
import { requireSession } from "@/lib/api-auth";
import { createNotification } from "@/lib/notifications";

const Schema = z.object({
  score: z.number().int().min(1).max(5),
  reviewText: z.string().max(2000).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: eq(recipes.id, id) });
  if (!recipe || (recipe.visibility === "private" && recipe.authorId !== session!.user.id)) {
    return NextResponse.json({ error: "Not found" }, { status: 404 });
  }
  if (recipe.authorId === session!.user.id) {
    return NextResponse.json({ error: "Cannot rate your own recipe" }, { status: 400 });
  }

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

  const existing = await db.query.ratings.findFirst({
    where: and(eq(ratings.recipeId, id), eq(ratings.userId, session!.user.id)),
  });

  if (existing) {
    await db.update(ratings)
      .set({ score: parsed.data.score, reviewText: parsed.data.reviewText, updatedAt: new Date() })
      .where(eq(ratings.id, existing.id));
    return NextResponse.json({ updated: true });
  }

  await db.insert(ratings).values({
    id: crypto.randomUUID(),
    recipeId: id,
    userId: session!.user.id,
    score: parsed.data.score,
    reviewText: parsed.data.reviewText,
  });
  void createNotification({ userId: recipe.authorId, type: "rating", actorId: session!.user.id, recipeId: id });
  return NextResponse.json({ created: true }, { status: 201 });
}