import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { db, pantryItems, eq, desc, sql } from "@epicure/db";
import { requireSession } from "@/lib/api-auth";

const Schema = z.object({
  rawName: z.string().min(1).max(200),
  quantity: z.string().optional(),
  unit: z.string().optional(),
  expiresAt: z.string().datetime().optional(),
});

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

  const { searchParams } = req.nextUrl;
  const limitRaw = parseInt(searchParams.get("limit") ?? "50");
  const limit = Math.min(Number.isNaN(limitRaw) ? 50 : Math.max(1, limitRaw), 100);
  const offsetRaw = parseInt(searchParams.get("offset") ?? "0");
  const offset = Number.isNaN(offsetRaw) ? 0 : Math.max(0, offsetRaw);

  const [items, totalRow] = await Promise.all([
    db.query.pantryItems.findMany({
      where: eq(pantryItems.userId, session!.user.id),
      orderBy: desc(pantryItems.createdAt),
      limit,
      offset,
    }),
    db
      .select({ total: sql<number>`count(*)::int` })
      .from(pantryItems)
      .where(eq(pantryItems.userId, session!.user.id)),
  ]);

  const total = totalRow[0]?.total ?? 0;

  return NextResponse.json({ data: items, total, limit, offset });
}

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

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

  const id = crypto.randomUUID();
  await db.insert(pantryItems).values({
    id,
    userId: session!.user.id,
    rawName: parsed.data.rawName,
    quantity: parsed.data.quantity,
    unit: parsed.data.unit,
    expiresAt: parsed.data.expiresAt ? new Date(parsed.data.expiresAt) : undefined,
  });

  return NextResponse.json({ id }, { status: 201 });
}