import * as plugins from './plugins.js';
import type { ISocketClientOptions, IApiResponse } from './interfaces/index.js';
import { SmartVMError } from './interfaces/index.js';

function getErrorMessage(err: unknown): string {
  return err instanceof Error ? err.message : String(err);
}

/**
 * HTTP client that communicates with Firecracker over a Unix domain socket.
 * Uses @push.rocks/smartrequest with the `http://unix:<socket>:<path>` URL format.
 */
export class SocketClient {
  private socketPath: string;

  constructor(options: ISocketClientOptions) {
    this.socketPath = options.socketPath;
  }

  /**
   * Build the Unix socket URL for a given API path.
   */
  private buildUrl(apiPath: string): string {
    return `http://unix:${this.socketPath}:${apiPath}`;
  }

  private async parseResponseBody<T>(response: any): Promise<T> {
    try {
      const text = await response.text();
      if (!text) {
        return undefined as T;
      }
      try {
        return JSON.parse(text) as T;
      } catch {
        return text as T;
      }
    } catch {
      return undefined as T;
    }
  }

  /**
   * Perform a GET request.
   */
  public async get<T = any>(apiPath: string): Promise<IApiResponse<T>> {
    const url = this.buildUrl(apiPath);
    try {
      const response = await plugins.SmartRequest.create()
        .url(url)
        .get();

      const statusCode = response.status;
      const body = await this.parseResponseBody<T>(response);
      return {
        statusCode,
        body,
        ok: response.ok,
      };
    } catch (err) {
      throw new SmartVMError(
        `GET ${apiPath} failed: ${getErrorMessage(err)}`,
        'SOCKET_REQUEST_FAILED',
      );
    }
  }

  /**
   * Perform a PUT request with a JSON body.
   */
  public async put<T = any>(apiPath: string, body?: Record<string, any>): Promise<IApiResponse<T>> {
      const url = this.buildUrl(apiPath);
      try {
        let request = plugins.SmartRequest.create().url(url);
        if (body !== undefined) {
        const bodyBuffer = Buffer.from(JSON.stringify(body));
        request = request
          .buffer(bodyBuffer, 'application/json')
          .header('Content-Length', String(bodyBuffer.length));
        }
      const response = await request.put();

      const statusCode = response.status;
      const responseBody = await this.parseResponseBody<T>(response);
      return {
        statusCode,
        body: responseBody,
        ok: response.ok,
      };
    } catch (err) {
      throw new SmartVMError(
        `PUT ${apiPath} failed: ${getErrorMessage(err)}`,
        'SOCKET_REQUEST_FAILED',
      );
    }
  }

  /**
   * Perform a PATCH request with a JSON body.
   */
  public async patch<T = any>(apiPath: string, body?: Record<string, any>): Promise<IApiResponse<T>> {
      const url = this.buildUrl(apiPath);
      try {
        let request = plugins.SmartRequest.create().url(url);
        if (body !== undefined) {
        const bodyBuffer = Buffer.from(JSON.stringify(body));
        request = request
          .buffer(bodyBuffer, 'application/json')
          .header('Content-Length', String(bodyBuffer.length));
        }
      const response = await request.patch();

      const statusCode = response.status;
      const responseBody = await this.parseResponseBody<T>(response);
      return {
        statusCode,
        body: responseBody,
        ok: response.ok,
      };
    } catch (err) {
      throw new SmartVMError(
        `PATCH ${apiPath} failed: ${getErrorMessage(err)}`,
        'SOCKET_REQUEST_FAILED',
      );
    }
  }

  /**
   * Check if the Firecracker API socket is ready by polling GET /version.
   */
  public async isReady(timeoutMs: number = 5000): Promise<boolean> {
    const start = Date.now();
    while (Date.now() - start < timeoutMs) {
      try {
        const response = await this.get('/version');
        if (response.ok) {
          return true;
        }
      } catch {
        // Socket not ready yet
      }
      await plugins.smartdelay.delayFor(100);
    }
    return false;
  }
}