/**
 * Legacy adapter that provides backward compatibility
 * Maps legacy API to the new core module
 */

import * as core from '../core/index.js';
import * as plugins from '../core/plugins.js';

const smartpromise = plugins.smartpromise;

// Re-export types for backward compatibility
export { type IExtendedIncomingMessage } from '../core/types.js';
export interface ISmartRequestOptions extends core.ICoreRequestOptions {
  autoJsonParse?: boolean;
  responseType?: 'json' | 'text' | 'binary' | 'stream';
}

// Re-export interface for form fields
export interface IFormField {
  name: string;
  type: 'string' | 'filePath' | 'Buffer';
  payload: string | Buffer;
  fileName?: string;
  contentType?: string;
}

/**
 * Helper function to convert stream to IExtendedIncomingMessage for legacy compatibility
 */
async function streamToExtendedMessage(
  stream: plugins.http.IncomingMessage,
  autoJsonParse = true
): Promise<core.IExtendedIncomingMessage> {
  const done = smartpromise.defer<core.IExtendedIncomingMessage>();
  const chunks: Buffer[] = [];
  
  stream.on('data', (chunk: Buffer) => {
    chunks.push(chunk);
  });
  
  stream.on('end', () => {
    const buffer = Buffer.concat(chunks);
    const extendedMessage = stream as core.IExtendedIncomingMessage;
    
    if (autoJsonParse) {
      const text = buffer.toString('utf-8');
      try {
        extendedMessage.body = JSON.parse(text);
      } catch (err) {
        extendedMessage.body = text;
      }
    } else {
      extendedMessage.body = buffer;
    }
    
    done.resolve(extendedMessage);
  });
  
  stream.on('error', (err) => {
    done.reject(err);
  });
  
  return done.promise;
}

/**
 * Legacy request function that returns IExtendedIncomingMessage
 */
export async function request(
  urlArg: string,
  optionsArg: ISmartRequestOptions = {},
  responseStreamArg = false,
  requestDataFunc?: (req: plugins.http.ClientRequest) => void
): Promise<core.IExtendedIncomingMessage> {
  const stream = await core.coreRequest(urlArg, optionsArg, requestDataFunc);
  
  if (responseStreamArg) {
    // For stream responses, just cast and return
    return stream as core.IExtendedIncomingMessage;
  }
  
  // Convert stream to IExtendedIncomingMessage
  const autoJsonParse = optionsArg.autoJsonParse !== false;
  return streamToExtendedMessage(stream, autoJsonParse);
}

/**
 * Safe GET request
 */
export async function safeGet(urlArg: string): Promise<core.IExtendedIncomingMessage | null> {
  const agentToUse = urlArg.startsWith('http://') 
    ? new plugins.http.Agent() 
    : new plugins.https.Agent();
  
  try {
    const response = await request(urlArg, {
      method: 'GET',
      agent: agentToUse,
      timeout: 5000,
      hardDataCuttingTimeout: 5000,
      autoJsonParse: false,
    });
    return response;
  } catch (err) {
    console.error(err);
    return null;
  }
}

/**
 * GET JSON request
 */
export async function getJson(urlArg: string, optionsArg: ISmartRequestOptions = {}) {
  optionsArg.method = 'GET';
  return request(urlArg, optionsArg);
}

/**
 * POST JSON request
 */
export async function postJson(urlArg: string, optionsArg: ISmartRequestOptions = {}) {
  optionsArg.method = 'POST';
  if (
    typeof optionsArg.requestBody === 'object' &&
    (!optionsArg.headers || !optionsArg.headers['Content-Type'])
  ) {
    // make sure headers exist
    if (!optionsArg.headers) {
      optionsArg.headers = {};
    }

    // assign the right Content-Type, leaving all other headers in place
    optionsArg.headers = {
      ...optionsArg.headers,
      'Content-Type': 'application/json',
    };
  }
  return request(urlArg, optionsArg);
}

/**
 * PUT JSON request
 */
export async function putJson(urlArg: string, optionsArg: ISmartRequestOptions = {}) {
  optionsArg.method = 'PUT';
  return request(urlArg, optionsArg);
}

/**
 * DELETE JSON request
 */
export async function delJson(urlArg: string, optionsArg: ISmartRequestOptions = {}) {
  optionsArg.method = 'DELETE';
  return request(urlArg, optionsArg);
}

/**
 * GET binary data
 */
export async function getBinary(urlArg: string, optionsArg: ISmartRequestOptions = {}) {
  optionsArg = {
    ...optionsArg,
    autoJsonParse: false,
    responseType: 'binary'
  };
  return request(urlArg, optionsArg);
}

/**
 * POST form data
 */
export async function postFormData(urlArg: string, formFields: IFormField[], optionsArg: ISmartRequestOptions = {}) {
  const form = new plugins.formData();
  
  for (const formField of formFields) {
    if (formField.type === 'filePath') {
      const fileData = plugins.fs.readFileSync(
        plugins.path.isAbsolute(formField.payload as string)
          ? formField.payload as string
          : plugins.path.join(process.cwd(), formField.payload as string)
      );
      form.append(formField.name, fileData, {
        filename: formField.fileName || plugins.path.basename(formField.payload as string),
        contentType: formField.contentType
      });
    } else if (formField.type === 'Buffer') {
      form.append(formField.name, formField.payload, {
        filename: formField.fileName,
        contentType: formField.contentType
      });
    } else {
      form.append(formField.name, formField.payload);
    }
  }
  
  optionsArg.method = 'POST';
  optionsArg.requestBody = form;
  if (!optionsArg.headers) {
    optionsArg.headers = {};
  }
  optionsArg.headers = {
    ...optionsArg.headers,
    ...form.getHeaders()
  };
  
  return request(urlArg, optionsArg);
}

/**
 * POST URL encoded form data
 */
export async function postFormDataUrlEncoded(
  urlArg: string,
  formFields: { key: string; content: string }[],
  optionsArg: ISmartRequestOptions = {}
) {
  optionsArg.method = 'POST';
  if (!optionsArg.headers) {
    optionsArg.headers = {};
  }
  optionsArg.headers['Content-Type'] = 'application/x-www-form-urlencoded';
  
  const urlEncodedBody = formFields
    .map(field => `${encodeURIComponent(field.key)}=${encodeURIComponent(field.content)}`)
    .join('&');
  
  optionsArg.requestBody = urlEncodedBody;
  
  return request(urlArg, optionsArg);
}

/**
 * GET stream
 */
export async function getStream(
  urlArg: string,
  optionsArg: ISmartRequestOptions = {}
): Promise<plugins.http.IncomingMessage> {
  optionsArg.method = 'GET';
  const response = await request(urlArg, optionsArg, true);
  return response;
}