import { z } from "zod";

export const calculatorConfigSchema = z.object({
  maxExpressionLength: z.number().int().positive().max(2000).default(500),
  precision: z.number().int().positive().max(50).default(10),
});

export type CalculatorToolConfig = z.infer<typeof calculatorConfigSchema>;

export const DEFAULT_CALCULATOR_CONFIG: CalculatorToolConfig = {
  maxExpressionLength: 500,
  precision: 10,
};

export function parseCalculatorConfig(raw: unknown): CalculatorToolConfig {
  const parsed = calculatorConfigSchema.safeParse(raw);
  if (!parsed.success) {
    throw new Error(`Invalid calculator config: ${parsed.error.message}`);
  }
  return parsed.data;
}