// @flow
import type {Plugin} from '../';
import type {ResponseHeader} from '../../models/response';

type MaybeResponse = {
  parentId?: string,
  statusCode?: number,
  statusMessage?: string,
  bytesRead?: number,
  elapsedTime?: number,
  headers?: Array<ResponseHeader>
}

export function init (
  plugin: Plugin,
  response: MaybeResponse,
  bodyBuffer: Buffer | null = null
): {response: Object} {
  if (!response) {
    throw new Error('contexts.response initialized without response');
  }

  return {
    response: {
      // TODO: Make this work. Right now it doesn't because _id is
      // not generated in network.js
      // getId () {
      //   return response.parentId;
      // },
      getRequestId (): string {
        return response.parentId || '';
      },
      getStatusCode (): number {
        return response.statusCode || 0;
      },
      getStatusMessage (): string {
        return response.statusMessage || '';
      },
      getBytesRead (): number {
        return response.bytesRead || 0;
      },
      getTime (): number {
        return response.elapsedTime || 0;
      },
      getBody (): Buffer | null {
        return bodyBuffer;
      },
      getHeader (name: string): string | Array<string> | null {
        const headers = response.headers || [];
        const matchedHeaders = headers.filter(h => h.name.toLowerCase() === name.toLowerCase());
        if (matchedHeaders.length > 1) {
          return matchedHeaders.map(h => h.value);
        } else if (matchedHeaders.length === 1) {
          return matchedHeaders[0].value;
        } else {
          return null;
        }
      },
      hasHeader (name: string): boolean {
        return this.getHeader(name) !== null;
      }
    }
  };
}