const fs = require('fs');
const git = require('simple-git');
const common = require('./lib/common');


/**
 * Action to deploy openwhisk elements from a compliant repository
 *  @param {string} gitUrl - github url containing the manifest and elements to deploy
 *  @param {string} manifestPath - (optional) the path to the manifest file, e.g. "openwhisk/src"
 *  @param {object} envData - (optional) env details such as cloudant username or cloudant password
 *  @return {object} Promise
 */
function main(params) {
  const activationId = process.env.__OW_ACTIVATION_ID;
  return new Promise((resolve, reject) => {
    // Grab optional envData and manifestPath params for wskdeploy
    let {
      envData,
      manifestPath,
      gitUrl
    } = params;

    // confirm gitUrl was provided as a parameter
    if (!gitUrl) {
      reject(new Error('Please enter the GitHub repo url in params'));
    }

    // if no manifestPath was provided, use current directory
    if (!manifestPath) {
      manifestPath = '.';
    }
    // Grab wsp api host and auth from params, or process.env
    const { wskApiHost, wskAuth } = getWskApiAuth(params);

    // Extract the name of the repo for the tmp directory
    const tmpUrl = gitUrl.replace('https://', '');
    const repoSplit = tmpUrl.split('/');
    const repoOrg = repoSplit[1];
    const repoName = repoSplit[2];
    const localDirName = `${__dirname}/../tmp/${repoOrg}/${repoName}`;
    const templatesDirName = `${__dirname}/preInstalled/${repoOrg}/${repoName}`;

    if (fs.existsSync(templatesDirName)) {
      resolve({
        repoDir: templatesDirName,
        usingTemp: false,
        manifestPath,
        manifestFileName: 'manifest.yaml',
        wskAuth,
        wskApiHost,
        envData,
      });
    } else {
      return git().clone(gitUrl, localDirName, ['--depth', '1'], (err) => {
        if (err) {
          reject(new Error('There was a problem cloning from github.  Does that github repo exist?  Does it begin with http?'));
        }
        resolve({
          repoDir: localDirName,
          usingTemp: true,
          manifestPath,
          manifestFileName: 'manifest.yaml',
          wskAuth,
          wskApiHost,
          envData,
        });
      });
    }
  })
    .then(result => common.main(result))
    .then(success =>
      new Promise((resolve, reject) => {
        resolve({
          status: success,
          activationId,
          success: true,
        });
      }))
    .catch(err => ({ error: err.message, activationId }));
}

/**
 * Checks if wsk API host and auth were provided in params, if not, gets them from process.env
 * @param  {[Object]} params    [Params object]
 * @return {[Object]}           [Object containing wskApiHost and wskAuth]
 */
function getWskApiAuth(params) {
  let {
    wskApiHost,
    wskAuth,
  } = params;

  if (!wskApiHost) {
    wskApiHost = process.env.__OW_API_HOST;
  }

  if (!wskAuth) {
    wskAuth = process.env.__OW_API_KEY;
  }

  return {
    wskApiHost,
    wskAuth,
  };
}

exports.main = main;