import request from "../config/request";
import { IIntegrationAuth } from "../models";
import {
  INTEGRATION_AZURE_KEY_VAULT,
  INTEGRATION_HEROKU,
  INTEGRATION_GITLAB,
} from "../variables";
import {
  INTEGRATION_AZURE_TOKEN_URL,
  INTEGRATION_HEROKU_TOKEN_URL,
  INTEGRATION_GITLAB_TOKEN_URL,
} from "../variables";
import { IntegrationService } from "../services";
import {
  getSiteURL,
  getClientIdAzure,
  getClientSecretAzure,
  getClientSecretHeroku,
  getClientIdGitLab,
  getClientSecretGitLab,
} from "../config";

interface RefreshTokenAzureResponse {
  token_type: string;
  scope: string;
  expires_in: number;
  ext_expires_in: 4871;
  access_token: string;
  refresh_token: string;
}

interface RefreshTokenHerokuResponse {
  access_token: string;
  expires_in: number;
  refresh_token: string;
  token_type: string;
  user_id: string;
}

interface RefreshTokenGitLabResponse {
  token_type: string;
  scope: string;
  expires_in: number;
  access_token: string;
  refresh_token: string;
  created_at: number;
}

/**
 * Return new access token by exchanging refresh token [refreshToken] for integration
 * named [integration]
 * @param {Object} obj
 * @param {String} obj.integration - name of integration
 * @param {String} obj.refreshToken - refresh token to use to get new access token for Heroku
 */
const exchangeRefresh = async ({
  integrationAuth,
  refreshToken,
}: {
  integrationAuth: IIntegrationAuth;
  refreshToken: string;
}) => {
  interface TokenDetails {
    accessToken: string;
    refreshToken: string;
    accessExpiresAt: Date;
  }

  let tokenDetails: TokenDetails;
  switch (integrationAuth.integration) {
    case INTEGRATION_AZURE_KEY_VAULT:
      tokenDetails = await exchangeRefreshAzure({
        refreshToken,
      });
      break;
    case INTEGRATION_HEROKU:
      tokenDetails = await exchangeRefreshHeroku({
        refreshToken,
      });
      break;
    case INTEGRATION_GITLAB:
      tokenDetails = await exchangeRefreshGitLab({
        refreshToken,
      });
      break;
    default:
      throw new Error("Failed to exchange token for incompatible integration");
  }

  if (
    tokenDetails?.accessToken &&
    tokenDetails?.refreshToken &&
    tokenDetails?.accessExpiresAt
  ) {
    await IntegrationService.setIntegrationAuthAccess({
      integrationAuthId: integrationAuth._id.toString(),
      accessId: null,
      accessToken: tokenDetails.accessToken,
      accessExpiresAt: tokenDetails.accessExpiresAt,
    });

    await IntegrationService.setIntegrationAuthRefresh({
      integrationAuthId: integrationAuth._id.toString(),
      refreshToken: tokenDetails.refreshToken,
    });
  }

  return tokenDetails.accessToken;
};

/**
 * Return new access token by exchanging refresh token [refreshToken] for the
 * Azure integration
 * @param {Object} obj
 * @param {String} obj.refreshToken - refresh token to use to get new access token for Azure
 * @returns
 */
const exchangeRefreshAzure = async ({
  refreshToken,
}: {
  refreshToken: string;
}) => {
  const accessExpiresAt = new Date();
  const { data }: { data: RefreshTokenAzureResponse } = await request.post(
    INTEGRATION_AZURE_TOKEN_URL,
    new URLSearchParams({
      client_id: await getClientIdAzure(),
      scope: "openid offline_access",
      refresh_token: refreshToken,
      grant_type: "refresh_token",
      client_secret: await getClientSecretAzure(),
    } as any)
  );

  accessExpiresAt.setSeconds(accessExpiresAt.getSeconds() + data.expires_in);

  return {
    accessToken: data.access_token,
    refreshToken: data.refresh_token,
    accessExpiresAt,
  };
};

/**
 * Return new access token by exchanging refresh token [refreshToken] for the
 * Heroku integration
 * @param {Object} obj
 * @param {String} obj.refreshToken - refresh token to use to get new access token for Heroku
 * @returns
 */
const exchangeRefreshHeroku = async ({
  refreshToken,
}: {
  refreshToken: string;
}) => {
  const accessExpiresAt = new Date();
  const {
    data,
  }: {
    data: RefreshTokenHerokuResponse;
  } = await request.post(
    INTEGRATION_HEROKU_TOKEN_URL,
    new URLSearchParams({
      grant_type: "refresh_token",
      refresh_token: refreshToken,
      client_secret: await getClientSecretHeroku(),
    } as any)
  );

  accessExpiresAt.setSeconds(accessExpiresAt.getSeconds() + data.expires_in);

  return {
    accessToken: data.access_token,
    refreshToken: data.refresh_token,
    accessExpiresAt,
  };
};

/**
 * Return new access token by exchanging refresh token [refreshToken] for the
 * GitLab integration
 * @param {Object} obj
 * @param {String} obj.refreshToken - refresh token to use to get new access token for GitLab
 * @returns
 */
const exchangeRefreshGitLab = async ({
  refreshToken,
}: {
  refreshToken: string;
}) => {
  const accessExpiresAt = new Date();
  const {
    data,
  }: {
    data: RefreshTokenGitLabResponse;
  } = await request.post(
    INTEGRATION_GITLAB_TOKEN_URL,
    new URLSearchParams({
      grant_type: "refresh_token",
      refresh_token: refreshToken,
      client_id: await getClientIdGitLab(),
      client_secret: await getClientSecretGitLab(),
      redirect_uri: `${await getSiteURL()}/integrations/gitlab/oauth2/callback`,
    } as any),
    {
      headers: {
        "Accept-Encoding": "application/json",
      },
    }
  );

  accessExpiresAt.setSeconds(accessExpiresAt.getSeconds() + data.expires_in);

  return {
    accessToken: data.access_token,
    refreshToken: data.refresh_token,
    accessExpiresAt,
  };
};

export { exchangeRefresh };