import getWeb3 from "./getWeb3";
import GoodsTransfer from "../contracts/GoodsTransfer.json";
import Web3 from "web3";

//global value to hold the elements needed
let web3Elements = {
  web3: null,
  accounts: null,
  contract: null,
};
//global value to hold transaction
let transactions = null;

/**
 * Function used to extract the elements needed from the web 3 instance
 * @category Web3
 * @function getData
 * @returns {Promise<object>} the promise that resolves to the {@link web3Elements} object or rejects with an error
 */
const getData = () =>
  new Promise(async (resolve, reject) => {
    try {
      // Get network provider and web3 instance.
      //check is the instance is valid by testing provider
      await getWeb3().then((res) => {
        web3Elements.web3 = res;
      });
      //console.log("web3 fetched from meta", web3Elements.web3);
      // Use web3 to get the user's accounts.
      web3Elements.accounts = await web3Elements.web3.eth.getAccounts();

      // Get the contract instance.
      const networkId = await web3Elements.web3.eth.net.getId();
      const deployedNetwork = GoodsTransfer.networks[networkId];
      web3Elements.contract = new web3Elements.web3.eth.Contract(
        GoodsTransfer.abi,
        deployedNetwork && deployedNetwork.address
      );
      transactions = await web3Elements.contract.methods
        .getAllTransactions()
        .call();
      // console.log(web3Elements);
      //console.log("META TRANSACTIONS", transactions);
      resolve(web3Elements);
    } catch (error) {
      reject(error);
      console.log(
        error,
        "Failed to load web3, accounts, or contract...check console for details"
      );
    }
  });

export default getData;
/**
 * Function used to fetch the web 3 elements from {@link getData}
 * @category Web3
 * @returns {Object} Web 3 elements
 */
export const fetchData = () => {
  return web3Elements;
};

/**
 * Function used to fetch transactions from {@link getData}
 * @category Web3
 * @returns {Array} An array of transactions attached to the contract
 */
export const fetchTransactions = () => {
  return transactions;
};

/**
 * Function used to fetch the address  from {@link getData}
 * @category Web3
 * @returns {String} The address of the current user
 */
export const fetchAddress = () => {
  return web3Elements.accounts[0];
};