const nodeFetch = require('node-fetch');
const stripAnsi = require('strip-ansi');

const getTestReport = require('./src/getTestReport');
const getEnvVariables = require('./src/getEnvVariables');

function comment(filepath) {
  const envVars = getEnvVariables();
  const { username, repoName, prNumber, apiKey } = envVars;

  if (!prNumber) {
    console.log('test report not uploaded to github; PR was not detected');
    return;
  }

  if (!username || !repoName || !apiKey) {
    const undefinedVars = [];
    if (!username) {
      undefinedVars.push('Username');
    }
    if (!repoName) {
      undefinedVars.push('Repo Name');
    }
    if (!apiKey) {
      undefinedVars.push('GitHub API Key');
    }
    throw `${undefinedVars.join(', ')} env variables must not be undefined`;
  }
  const body = stripAnsi(getTestReport(filepath));
  const request = {
    method: 'POST',
    body: JSON.stringify({ body }),
    headers: {
      'Content-Type': 'application/json',
      Accept: 'application/vnd.github.v3+json',
      Authorization: `token ${apiKey}`,
      'User-Agent': repoName
    }
  };
  console.log(
    `https://api.github.com/repos/${username}/${repoName}/issues/${prNumber}/comments`
  );
  return nodeFetch(
    `https://api.github.com/repos/${username}/${repoName}/issues/${prNumber}/comments`,
    request
  ).then(res => {
    if (res.status === 201) {
      return body;
    } else {
      throw 'Error posting GitHub request';
    }
  });
}

function getReport(filepath) {
  return stripAnsi(getTestReport(filepath));
}

module.exports = {
  comment,
  getReport
};