/**
 * Plain LangChain JS tool definitions: name, description, schema and func.
 * No import from "@langchain/core", so this file type-checks and tests without it.
 * tools.ts wraps each one in tool() from "@langchain/core/tools".
 * Results are JSON strings, which every LangChain agent accepts as a tool message.
 */
import { AFTER_CHECKOUT_DESCRIPTION, BEFORE_CHECKOUT_DESCRIPTION, afterCheckout, beforeCheckout, userAgentFor, type ArcOptions } from "../core/arc.ts";
import { afterCheckoutSchema, beforeCheckoutSchema, type AfterCheckoutArgs, type BeforeCheckoutArgs } from "../core/schemas.ts";

export const LANGCHAIN_REF = "int-langchain-js";

export type ArcToolConfig = ArcOptions & { agentName?: string; agentFamily?: string };

export function arcLangChainDefinitions(config: ArcToolConfig = {}) {
  const options: ArcOptions = { userAgent: userAgentFor("langchain"), ref: LANGCHAIN_REF, ...config };
  return {
    before: {
      name: "arc_before_checkout",
      description: BEFORE_CHECKOUT_DESCRIPTION,
      schema: beforeCheckoutSchema,
      func: async (args: BeforeCheckoutArgs) => JSON.stringify(await beforeCheckout(args, options)),
    },
    after: {
      name: "arc_after_checkout",
      description: AFTER_CHECKOUT_DESCRIPTION,
      schema: afterCheckoutSchema,
      func: async (args: AfterCheckoutArgs) =>
        JSON.stringify(
          await afterCheckout({ ...args, agent_name: config.agentName ?? "langchain-agent", agent_family: config.agentFamily ?? "langchain" }, options),
        ),
    },
  };
}