import * as plugins from './plugins.js';
import * as paths from './paths.js';
import { MultiModalModel } from './abstract.classes.multimodal.js';
import type { ChatOptions, ChatResponse, ChatMessage } from './abstract.classes.multimodal.js';
import type { ChatCompletionMessageParam } from 'openai/resources/chat/completions';

export interface IExoProviderOptions {
  exoBaseUrl?: string;
  apiKey?: string;
}

export class ExoProvider extends MultiModalModel {
  private options: IExoProviderOptions;
  public openAiApiClient: plugins.openai.default;

  constructor(optionsArg: IExoProviderOptions = {}) {
    super();
    this.options = {
      exoBaseUrl: 'http://localhost:8080/v1',  // Default Exo API endpoint
      ...optionsArg
    };
  }

  public async start() {
    this.openAiApiClient = new plugins.openai.default({
      apiKey: this.options.apiKey || 'not-needed',  // Exo might not require an API key for local deployment
      baseURL: this.options.exoBaseUrl,
    });
  }

  public async stop() {}

  public async chatStream(input: ReadableStream<Uint8Array>): Promise<ReadableStream<string>> {
    // Create a TextDecoder to handle incoming chunks
    const decoder = new TextDecoder();
    let buffer = '';
    let currentMessage: { role: string; content: string; } | null = null;

    // Create a TransformStream to process the input
    const transform = new TransformStream<Uint8Array, string>({
      async transform(chunk, controller) {
        buffer += decoder.decode(chunk, { stream: true });

        // Try to parse complete JSON messages from the buffer
        while (true) {
          const newlineIndex = buffer.indexOf('\n');
          if (newlineIndex === -1) break;

          const line = buffer.slice(0, newlineIndex);
          buffer = buffer.slice(newlineIndex + 1);

          if (line.trim()) {
            try {
              const message = JSON.parse(line);
              currentMessage = message;
              
              // Process the message based on its type
              if (message.type === 'message') {
                const response = await this.chat({
                  systemMessage: '',
                  userMessage: message.content,
                  messageHistory: [{ role: message.role as 'user' | 'assistant' | 'system', content: message.content }]
                });
                
                controller.enqueue(JSON.stringify(response) + '\n');
              }
            } catch (error) {
              console.error('Error processing message:', error);
            }
          }
        }
      },
      flush(controller) {
        if (buffer) {
          try {
            const message = JSON.parse(buffer);
            currentMessage = message;
          } catch (error) {
            console.error('Error processing remaining buffer:', error);
          }
        }
      }
    });

    return input.pipeThrough(transform);
  }

  public async chat(options: ChatOptions): Promise<ChatResponse> {
    const messages: ChatCompletionMessageParam[] = [
      { role: 'system', content: options.systemMessage },
      ...options.messageHistory,
      { role: 'user', content: options.userMessage }
    ];

    try {
      const response = await this.openAiApiClient.chat.completions.create({
        model: 'local-model', // Exo uses local models
        messages: messages,
        stream: false
      });

      return {
        role: 'assistant',
        message: response.choices[0]?.message?.content || ''
      };
    } catch (error) {
      console.error('Error in chat completion:', error);
      throw error;
    }
  }

  public async audio(optionsArg: { message: string }): Promise<NodeJS.ReadableStream> {
    throw new Error('Audio generation is not supported by Exo provider');
  }

  public async vision(optionsArg: { image: Buffer; prompt: string }): Promise<string> {
    throw new Error('Vision processing is not supported by Exo provider');
  }

  public async document(optionsArg: {
    systemMessage: string;
    userMessage: string;
    pdfDocuments: Uint8Array[];
    messageHistory: ChatMessage[];
  }): Promise<{ message: any }> {
    throw new Error('Document processing is not supported by Exo provider');
  }
}