var https = require('https');
var fs = require('fs');

const CONFIG_FILE_NAME = 'mempool-frontend-config.json';
let configContent = {};

var PATH = 'dist/mempool/browser/en-US/resources/';
if (process.argv[2] && process.argv[2] === 'dev') {
  PATH = 'src/resources/';
}

try {
  const rawConfig = fs.readFileSync(CONFIG_FILE_NAME);
  configContent = JSON.parse(rawConfig);
  console.log(`${CONFIG_FILE_NAME} file found, using provided config`);
} catch (e) {
  if (e.code !== 'ENOENT') {
    throw new Error(e);
  } else {
    console.log(`${CONFIG_FILE_NAME} file not found, using default config`);
  }
}

function download(filename, url) {
  https.get(url, (response) => {
    if (response.statusCode < 200 || response.statusCode > 299) {
      throw new Error('HTTP Error ' + response.statusCode + ' while fetching \'' + filename + '\'');
    }
    response.pipe(fs.createWriteStream(filename));
  })
  .on('error', function(e) {
    throw new Error(e);
  });
}

function downloadMiningPoolLogos() {
  const options = {
    host: 'api.github.com',
    path: '/repos/mempool/mining-pools/contents/',
    method: 'GET',
    headers: {'user-agent': 'node.js'}
  };

  https.get(options, (response) => {
    let chunks_of_data = [];

    response.on('data', (fragments) => {
      chunks_of_data.push(fragments);
    });
  
    response.on('end', () => {
      let response_body = Buffer.concat(chunks_of_data);
      const poolLogos = JSON.parse(response_body.toString());
      for (const poolLogo of poolLogos) {
          download(`${PATH}/mining-pools/${poolLogo.name}`, poolLogo.download_url);
      }
    });
  
    response.on('error', (error) => {
      throw new Error(error);
    });
  })
}

const poolsJsonUrl = 'https://raw.githubusercontent.com/btccom/Blockchain-Known-Pools/master/pools.json';
let assetsJsonUrl = 'https://raw.githubusercontent.com/mempool/asset_registry_db/master/index.json';
let assetsMinimalJsonUrl = 'https://raw.githubusercontent.com/mempool/asset_registry_db/master/index.minimal.json';

if (configContent.BASE_MODULE && configContent.BASE_MODULE === 'liquid') {
  assetsJsonUrl = 'https://raw.githubusercontent.com/Blockstream/asset_registry_db/master/index.json';
  assetsMinimalJsonUrl = 'https://raw.githubusercontent.com/Blockstream/asset_registry_db/master/index.minimal.json';
}

const testnetAssetsJsonUrl = 'https://raw.githubusercontent.com/Blockstream/asset_registry_testnet_db/master/index.json';
const testnetAssetsMinimalJsonUrl = 'https://raw.githubusercontent.com/Blockstream/asset_registry_testnet_db/master/index.minimal.json';

console.log('Downloading assets');
download(PATH + 'assets.json', assetsJsonUrl);
console.log('Downloading assets minimal');
download(PATH + 'assets.minimal.json', assetsMinimalJsonUrl);
console.log('Downloading mining pools info');
download(PATH + 'pools.json', poolsJsonUrl);
console.log('Downloading testnet assets');
download(PATH + 'assets-testnet.json', testnetAssetsJsonUrl);
console.log('Downloading testnet assets minimal');
download(PATH + 'assets-testnet.minimal.json', testnetAssetsMinimalJsonUrl);
console.log('Downloading mining pool logos');
downloadMiningPoolLogos();