formulation/src/application/pages/api/v1/convert.ts

import type { APIRoute } from "astro";
import { openDatabase } from "../../../../lib/database";
import { createMcpTools } from "../../../../mcp/tools";

export const prerender = false;

export const POST: APIRoute = async ({ request }) => {
  const database = openDatabase({ readOnly: true });
  if (!database) return Response.json({ success: false, error: "Database unavailable." }, { status: 503 });

  try {
    const body = await request.json();
    if (!body.quantity || !body.from_unit || !body.to_unit) {
      return Response.json(
        { success: false, error: "Required fields: quantity, from_unit, to_unit" },
        { status: 400 }
      );
    }

    const tools = createMcpTools(() => database);
    const result = tools.convertUnits({
      ingredient_id: body.ingredient_id,
      quantity: Number(body.quantity),
      from_unit: body.from_unit,
      to_unit: body.to_unit,
    });
    return Response.json({ success: true, data: result });
  } catch (error) {
    return Response.json(
      { success: false, error: error instanceof Error ? error.message : "Conversion failed." },
      { status: 400 }
    );
  } finally {
    database.close();
  }
};