import { Command } from "./command";
import { MiddlewareStack } from "./middleware";
import { MetadataBearer } from "./response";

/**
 * function definition for different overrides of client's 'send' function.
 */
interface InvokeFunction<InputTypes extends object, OutputTypes extends MetadataBearer, ResolvedClientConfiguration> {
  <InputType extends InputTypes, OutputType extends OutputTypes>(
    command: Command<InputTypes, InputType, OutputTypes, OutputType, ResolvedClientConfiguration>,
    options?: any
  ): Promise<OutputType>;
  <InputType extends InputTypes, OutputType extends OutputTypes>(
    command: Command<InputTypes, InputType, OutputTypes, OutputType, ResolvedClientConfiguration>,
    options: any,
    cb: (err: any, data?: OutputType) => void
  ): void;
  <InputType extends InputTypes, OutputType extends OutputTypes>(
    command: Command<InputTypes, InputType, OutputTypes, OutputType, ResolvedClientConfiguration>,
    options?: any,
    cb?: (err: any, data?: OutputType) => void
  ): Promise<OutputType> | void;
}

/**
 * A general interface for service clients, idempotent to browser or node clients
 * This type corresponds to SmithyClient(https://github.com/aws/aws-sdk-js-v3/blob/main/packages/smithy-client/src/client.ts).
 * It's provided for using without importing the SmithyClient class.
 */
export interface Client<Input extends object, Output extends MetadataBearer, ResolvedClientConfiguration> {
  readonly config: ResolvedClientConfiguration;
  middlewareStack: MiddlewareStack<Input, Output>;
  send: InvokeFunction<Input, Output, ResolvedClientConfiguration>;
  destroy: () => void;
}