import * as plugins from './plugins.js';
import * as types from './types.js';

/**
 * Modern Response class that provides a fetch-like API
 */
export class SmartResponse<T = any> implements types.ICoreResponse<T> {
  private incomingMessage: plugins.http.IncomingMessage;
  private bodyBufferPromise: Promise<Buffer> | null = null;
  private consumed = false;

  // Public properties
  public readonly ok: boolean;
  public readonly status: number;
  public readonly statusText: string;
  public readonly headers: plugins.http.IncomingHttpHeaders;
  public readonly url: string;

  constructor(incomingMessage: plugins.http.IncomingMessage, url: string) {
    this.incomingMessage = incomingMessage;
    this.url = url;
    this.status = incomingMessage.statusCode || 0;
    this.statusText = incomingMessage.statusMessage || '';
    this.ok = this.status >= 200 && this.status < 300;
    this.headers = incomingMessage.headers;
  }

  /**
   * Ensures the body can only be consumed once
   */
  private ensureNotConsumed(): void {
    if (this.consumed) {
      throw new Error('Body has already been consumed');
    }
    this.consumed = true;
  }

  /**
   * Collects the body as a buffer
   */
  private async collectBody(): Promise<Buffer> {
    this.ensureNotConsumed();
    
    if (this.bodyBufferPromise) {
      return this.bodyBufferPromise;
    }

    this.bodyBufferPromise = new Promise<Buffer>((resolve, reject) => {
      const chunks: Buffer[] = [];
      
      this.incomingMessage.on('data', (chunk: Buffer) => {
        chunks.push(chunk);
      });
      
      this.incomingMessage.on('end', () => {
        resolve(Buffer.concat(chunks));
      });
      
      this.incomingMessage.on('error', reject);
    });

    return this.bodyBufferPromise;
  }

  /**
   * Parse response as JSON
   */
  async json(): Promise<T> {
    const buffer = await this.collectBody();
    const text = buffer.toString('utf-8');
    
    try {
      return JSON.parse(text);
    } catch (error) {
      throw new Error(`Failed to parse JSON: ${error.message}`);
    }
  }

  /**
   * Get response as text
   */
  async text(): Promise<string> {
    const buffer = await this.collectBody();
    return buffer.toString('utf-8');
  }

  /**
   * Get response as ArrayBuffer
   */
  async arrayBuffer(): Promise<ArrayBuffer> {
    const buffer = await this.collectBody();
    return buffer.buffer.slice(buffer.byteOffset, buffer.byteOffset + buffer.byteLength);
  }

  /**
   * Get response as a readable stream
   */
  stream(): NodeJS.ReadableStream {
    this.ensureNotConsumed();
    return this.incomingMessage;
  }

  /**
   * Get the raw IncomingMessage (for legacy compatibility)
   */
  raw(): plugins.http.IncomingMessage {
    return this.incomingMessage;
  }

}