import axios, { AxiosInstance } from "axios";
import { APIResponse } from "./APIResponse";
import { APIOptions } from "./APIOptions";
import { AccessTokenResponse } from "./AccessTokenResponse";
import { SwychAxiosInstance } from "./SwychAxiosInstance";

// tslint:disable: no-console

export class BaseAPI {
  private instance: SwychAxiosInstance;

  constructor(private options: APIOptions) {}

  public async initialize() {
    this.instance = await SwychAxiosInstance.newInstance(
      this.options,
      this.getAccessToken.bind(this)
    );
  }

  public getAxiosInstance(): AxiosInstance {
    return this.instance.getAxiosInstance();
  }

  async getAccessToken(): Promise<APIResponse<AccessTokenResponse>> {
    const req = axios.get(`${this.options.baseUrl}/access-token`, {
      headers: {
        "Swych-Secret-Id": this.options.apiKey,
        "Swych-Secret-Key": this.options.secretKey
      }
    });

    return this.executeRequest<AccessTokenResponse>(req);
  }

  async executeRequest<T>(req: any): Promise<APIResponse<T>> {
    try {
      const response = await req;
      const { data } = response;

      const { error, code, message } = data;
      if (error) {
        return {
          error: {
            error,
            code,
            message
          }
        };
      }

      delete data.error;
      return { response: data };
    } catch (ex) {
      return this.getError(ex);
    }
  }

  getError(ex: any): APIResponse<any> {
    const { response } = ex;
    if (response) {
      const { data } = response;
      if (data) {
        const { error } = data;
        if (error) {
          return {
            error
          };
        }
      }
    }

    return {
      error: [
        {
          message: ex.error || ex
        }
      ]
    };
  }
}