const {parse, format} = require('url');
const {isUndefined} = require('lodash');
const gitUrlParse = require('git-url-parse');
const hostedGitInfo = require('hosted-git-info');
const {verifyAuth} = require('./git');

const GIT_TOKENS = ['GIT_CREDENTIALS', 'GH_TOKEN', 'GITHUB_TOKEN', 'GL_TOKEN', 'GITLAB_TOKEN'];

/**
 * Determine the the git repository URL to use to push, either:
 * - The `repositoryUrl` as is if allowed to push
 * - The `repositoryUrl` converted to `https` or `http` with Basic Authentication
 *
 * In addition, expand shortcut URLs (`owner/repo` => `https://github.com/owner/repo.git`) and transform `git+https` / `git+http` URLs to `https` / `http`.
 *
 * @param {String}  repositoryUrl The user provided Git repository URL.
 * @return {String} The formatted Git repository URL.
 */
module.exports = async ({repositoryUrl, branch}) => {
  if (repositoryUrl) {
    const info = hostedGitInfo.fromUrl(repositoryUrl, {noGitPlus: true});

    if (info && info.getDefaultRepresentation() === 'shortcut') {
      // Expand shorthand URLs (such as `owner/repo` or `gitlab:owner/repo`)
      repositoryUrl = info.https();
    } else {
      const {protocols} = gitUrlParse(repositoryUrl);

      // Replace `git+https` and `git+http` with `https` or `http`
      if (protocols.includes('http') || protocols.includes('https')) {
        repositoryUrl = format({
          ...parse(repositoryUrl),
          ...{protocol: protocols.includes('https') ? 'https' : 'http'},
        });
      }
    }

    // Test if push is allowed without transforming the URL (e.g. is ssh keys are set up)
    if (!await verifyAuth(repositoryUrl, branch)) {
      const envVar = GIT_TOKENS.find(envVar => !isUndefined(process.env[envVar]));
      const gitCredentials = ['GL_TOKEN', 'GITLAB_TOKEN'].includes(envVar)
        ? `gitlab-ci-token:${process.env[envVar]}`
        : process.env[envVar];
      const {protocols} = gitUrlParse(repositoryUrl);
      const protocol = protocols.includes('https') ? 'https' : protocols.includes('http') ? 'http' : 'https';

      // If credentials are set via anvironment variables, convert the URL to http/https and add basic auth, otherwise return `repositoryUrl` as is
      return gitCredentials
        ? format({...parse(`${gitUrlParse(repositoryUrl).toString(protocol)}.git`), ...{auth: gitCredentials}})
        : repositoryUrl;
    }
  }
  return repositoryUrl;
};