import {
  type ChatCompletionChunk,
  type ChatCompletionCreateParamsStreaming,
} from '../resources/chat/completions';
import { RunnerOptions, type AbstractChatCompletionRunnerEvents } from './AbstractChatCompletionRunner';
import { type ReadableStream } from '../_shims/index';
import { RunnableTools, type BaseFunctionsArgs, type RunnableFunctions } from './RunnableFunction';
import { ChatCompletionSnapshot, ChatCompletionStream } from './ChatCompletionStream';
import OpenAI from '../index';
import { AutoParseableTool } from '../lib/parser';

export interface ChatCompletionStreamEvents extends AbstractChatCompletionRunnerEvents {
  content: (contentDelta: string, contentSnapshot: string) => void;
  chunk: (chunk: ChatCompletionChunk, snapshot: ChatCompletionSnapshot) => void;
}

export type ChatCompletionStreamingFunctionRunnerParams<FunctionsArgs extends BaseFunctionsArgs> = Omit<
  ChatCompletionCreateParamsStreaming,
  'functions'
> & {
  functions: RunnableFunctions<FunctionsArgs>;
};

export type ChatCompletionStreamingToolRunnerParams<FunctionsArgs extends BaseFunctionsArgs> = Omit<
  ChatCompletionCreateParamsStreaming,
  'tools'
> & {
  tools: RunnableTools<FunctionsArgs> | AutoParseableTool<any, true>[];
};

export class ChatCompletionStreamingRunner<ParsedT = null>
  extends ChatCompletionStream<ParsedT>
  implements AsyncIterable<ChatCompletionChunk>
{
  static override fromReadableStream(stream: ReadableStream): ChatCompletionStreamingRunner<null> {
    const runner = new ChatCompletionStreamingRunner(null);
    runner._run(() => runner._fromReadableStream(stream));
    return runner;
  }

  /** @deprecated - please use `runTools` instead. */
  static runFunctions<T extends (string | object)[]>(
    client: OpenAI,
    params: ChatCompletionStreamingFunctionRunnerParams<T>,
    options?: RunnerOptions,
  ): ChatCompletionStreamingRunner<null> {
    const runner = new ChatCompletionStreamingRunner(null);
    const opts = {
      ...options,
      headers: { ...options?.headers, 'X-Stainless-Helper-Method': 'runFunctions' },
    };
    runner._run(() => runner._runFunctions(client, params, opts));
    return runner;
  }

  static runTools<T extends (string | object)[], ParsedT = null>(
    client: OpenAI,
    params: ChatCompletionStreamingToolRunnerParams<T>,
    options?: RunnerOptions,
  ): ChatCompletionStreamingRunner<ParsedT> {
    const runner = new ChatCompletionStreamingRunner<ParsedT>(
      // @ts-expect-error TODO these types are incompatible
      params,
    );
    const opts = {
      ...options,
      headers: { ...options?.headers, 'X-Stainless-Helper-Method': 'runTools' },
    };
    runner._run(() => runner._runTools(client, params, opts));
    return runner;
  }
}