import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { UserContext } from "../types";
import { registerPaidTool } from "../server/paidTool";
import { z } from "zod";
export async function registerPremiumMathTool(server: McpServer, userContext: UserContext, env: Env) {
await registerPaidTool(
server,
userContext,
env,
"premium_calculate",
"Perform advanced mathematical calculations (premium feature)",
{
expression: z.string().describe("Mathematical expression to evaluate (supports advanced operations like sin, cos, log, etc.)"),
precision: z.number().min(1).max(15).default(6).describe("Number of decimal places for the result (default: 6)")
},
async ({ expression, precision = 6 }) => {
try {
// This is a mock premium calculation
// In a real implementation, you'd integrate with a proper math library
const result = evaluateExpression(expression, precision);
return {
content: [
{
type: "text" as const,
text: `Premium calculation result:\nExpression: ${expression}\nResult: ${result}\nPrecision: ${precision} decimal places\nCalculated for: ${userContext.name}`
}
]
};
} catch (error) {
return {
content: [
{
type: "text" as const,
text: `Error evaluating expression "${expression}": ${error instanceof Error ? error.message : 'Invalid expression'}`
}
]
};
}
},
{
priceId: env.STRIPE_PRICE_ID || 'price_1RaD8VPBdD7BEaodFkzCdtcy', // You'll need to set this in your Stripe dashboard
paymentReason: "Premium mathematical calculations require a subscription to access advanced computational features.",
mode: 'subscription', // or 'payment' for one-time payments,
meterEvent: 'premium_math_calculation'
}
);
}
// Mock function to evaluate mathematical expressions
function evaluateExpression(expression: string, precision: number): string {
// This is a simplified mock implementation
// In production, you'd use a proper math parser like math.js
try {
// Basic security check - only allow numbers, operators, and basic math functions
if (!/^[0-9+\-*/.()sin cos tan log sqrt \s]+$/i.test(expression)) {
throw new Error('Invalid characters in expression');
}
// Mock calculation - just return a formatted result
const mockResult = Math.random() * 1000;
return mockResult.toFixed(precision);
} catch (error) {
throw new Error('Failed to evaluate expression');
}
}
