import { ILlmSchema } from "./ILlmSchema";
import { IMcpLlmFunction } from "./IMcpLlmFunction";

/**
 * Application of LLM function call from MCP document.
 *
 * `IMcpLlmApplication` is an interface representing a collection of
 * {@link IMcpLlmFunction LLM function calling schemas} composed from the
 * MCP (Model Context Protocol) document. It contains
 * {@link IMcpLlmApplication.errors failed functions}, and adjusted
 * {@link IMcpLlmApplication.options options} during the `IMcpLlmApplication`
 * construction.
 *
 * About each function of MCP server, there can be {@link errors} during
 * the composition, if the target {@link model} does not support the
 * function's {@link IMcpLlmFunction.parameters} type. For example,
 * Google Gemini model does not support union type, so that the function
 * containing the union type would be placed into the {@link errors} list
 * instead of {@link functions}.
 *
 * Also, each function has its own {@link IMcpLlmFunction.validate}
 * function for correcting AI agent's mistakes, and this is the reason why
 * `@samchon/openapi` recommends not to use the
 * [`mcp_servers`](https://openai.github.io/openai-agents-python/mcp/#using-mcp-servers)
 * property of LLM API directly, but to use the function calling feature
 * instead.
 *
 * @author Jeongho Nam - https://github.com/samchon
 * @author Byeongjin Oh - https://github.com/sunrabbit123
 */
export interface IMcpLlmApplication<Model extends ILlmSchema.Model> {
  /**
   * Model of the target LLM.
   */
  model: Model;

  /**
   * List of function metadata.
   *
   * List of function metadata that can be used for the LLM function call.
   */
  functions: IMcpLlmFunction<Model>[];

  /**
   * List of errors occurred during the composition.
   */
  errors: IMcpLlmApplication.IError[];

  /**
   * Configuration for the application.
   */
  options: IMcpLlmApplication.IOptions<Model>;
}
export namespace IMcpLlmApplication {
  /**
   * Options for the HTTP LLM application schema composition.
   */
  export type IOptions<Model extends ILlmSchema.Model> =
    ILlmSchema.ModelConfig[Model] & {
      /**
       * Maximum length of function name.
       *
       * When a function name is longer than this value, it will be truncated.
       *
       * If not possible to truncate due to the duplication, the function name
       * would be modified to randomly generated (UUID v4).
       *
       * @default 64
       */
      maxLength?: number;
    };

  /**
   * Error occurred in the composition.
   */
  export interface IError {
    /**
     * Name of the failed function.
     */
    name: string;

    /**
     * Description of the failed function.
     */
    description?: string | undefined;

    /**
     * Parameters of the function.
     */
    parameters: object;

    /**
     * Error messages.
     *
     * The reason why the function is failed to be convert.
     */
    messages: string[];
  }
}