import { constants } from "./constants";
import { messages } from "./messages";
import swal from "sweetalert";

var toAscii = function(hex) {
  var str = "",
    i = 0,
    l = hex.length;
  if (hex.substring(0, 2) === "0x") {
    i = 2;
  }
  for (; i < l; i += 2) {
    var code = parseInt(hex.substr(i, 2), 16);
    if (code === 0) continue; // this is added
    str += String.fromCharCode(code);
  }
  return str;
};

function addressesURL(branch) {
  const URL = `https://raw.githubusercontent.com/${constants.organization}/${
    constants.repoName
  }/${branch}/${constants.addressesSourceFile}`;
  return URL;
}

function ABIURL(branch, contract) {
  const URL = `https://raw.githubusercontent.com/${constants.organization}/${
    constants.repoName
  }/${branch}/abis/${constants.ABIsSources[contract]}`;
  return URL;
}

function getABI(branch, contract) {
  let addr = ABIURL(branch, contract);
  return fetch(addr).then(function(response) {
    return response.json();
  });
}

function wrongRepoAlert(addr) {
  var content = document.createElement("div");
  content.innerHTML = `<div>
      Something went wrong!<br/><br/>
      ${messages.wrongRepo(addr)}
    </div>`;
  swal({
    icon: "error",
    title: "Error",
    content: content
  });
}

function getBranch(netId) {
  switch (netId) {
    case constants.NETID_DAI_TEST:
      return "dai-test";
    case constants.NETID_SOKOL:
      return "sokol";
    case constants.NETID_DAI:
      return "dai";
    case constants.NETID_CORE:
    default:
      return "core";
  }
}

function isTestnet(netId) {
  return netId === constants.NETID_SOKOL || netId === constants.NETID_DAI_TEST;
}

let helpers = {
  toAscii,
  addressesURL,
  ABIURL,
  getABI,
  wrongRepoAlert,
  getBranch,
  isTestnet
};

export default helpers;