const args = require('minimist')(process.argv.slice(2));
const nugget = require('nugget');
const request = require('request');

async function makeRequest (requestOptions, parseResponse) {
  return new Promise((resolve, reject) => {
    request(requestOptions, (err, res, body) => {
      if (!err && res.statusCode >= 200 && res.statusCode < 300) {
        if (parseResponse) {
          const build = JSON.parse(body);
          resolve(build);
        } else {
          resolve(body);
        }
      } else {
        if (args.verbose) {
          console.error('Error occurred while requesting:', requestOptions.url);
          if (parseResponse) {
            try {
              console.log('Error: ', `(status ${res.statusCode})`, err || JSON.parse(res.body), requestOptions);
            } catch (err) {
              console.log('Error: ', `(status ${res.statusCode})`, err || res.body, requestOptions);
            }
          } else {
            console.log('Error: ', `(status ${res.statusCode})`, err || res.body, requestOptions);
          }
        }
        reject(err);
      }
    });
  });
}

async function downloadArtifact (name, buildNum, dest) {
  const circleArtifactUrl = `https://circleci.com/api/v1.1/project/github/electron/electron/${args.buildNum}/artifacts?circle-token=${process.env.CIRCLE_TOKEN}`;
  const artifacts = await makeRequest({
    method: 'GET',
    url: circleArtifactUrl,
    headers: {
      'Content-Type': 'application/json',
      'Accept': 'application/json'
    }
  }, true).catch(err => {
    if (args.verbose) {
      console.log('Error calling CircleCI:', err);
    } else {
      console.error('Error calling CircleCI to get artifact details');
    }
  });
  const artifactToDownload = artifacts.find(artifact => {
    return (artifact.path === name);
  });
  if (!artifactToDownload) {
    console.log(`Could not find artifact called ${name} to download for build #${buildNum}.`);
    process.exit(1);
  } else {
    console.log(`Downloading ${artifactToDownload.url}.`);
    let downloadError = false;
    await downloadWithRetry(artifactToDownload.url, dest).catch(err => {
      if (args.verbose) {
        console.log(`${artifactToDownload.url} could not be successfully downloaded.  Error was:`, err);
      } else {
        console.log(`${artifactToDownload.url} could not be successfully downloaded.`);
      }
      downloadError = true;
    });
    if (!downloadError) {
      console.log(`Successfully downloaded ${name}.`);
    }
  }
}

async function downloadWithRetry (url, directory) {
  let lastError;
  const downloadURL = `${url}?circle-token=${process.env.CIRCLE_TOKEN}`;
  for (let i = 0; i < 5; i++) {
    console.log(`Attempting to download ${url} - attempt #${(i + 1)}`);
    try {
      return await downloadFile(downloadURL, directory);
    } catch (err) {
      lastError = err;
      await new Promise((resolve, reject) => setTimeout(resolve, 30000));
    }
  }
  throw lastError;
}

function downloadFile (url, directory) {
  return new Promise((resolve, reject) => {
    const nuggetOpts = {
      dir: directory,
      quiet: args.verbose
    };
    nugget(url, nuggetOpts, (err) => {
      if (err) {
        reject(err);
      } else {
        resolve();
      }
    });
  });
}

if (!args.name || !args.buildNum || !args.dest) {
  console.log(`Download CircleCI artifacts.
    Usage: download-circleci-artifacts.js [--buildNum=CIRCLE_BUILD_NUMBER] [--name=artifactName] [--dest] [--verbose]`);
  process.exit(0);
} else {
  downloadArtifact(args.name, args.buildNum, args.dest);
}
