const util = require('util');
const Web3 = require('web3');
const utils = require('j7/utils');
const event = require('j7/event');
const metaFactory = require('./metadata/factory');
const constant = require("./constant");
const { ERC20ABI } = require("./ERC20ABI");

class BlockChain {

  constructor() {
    this.netId = 0;
    this.coinInstanceHash = {};
  }

  async initInstance(user, address, jsonUrl) {
    const json = utils.readJsonFromFile(jsonUrl);
    return new this.web3.eth.Contract(
      json.abi,
      address,
      { from: user }
    );
  }

  async init() {
    this.web3 = new Web3(metaFactory.getWeb3Conf()['block_server']);
    this.web3.eth.handleRevert = true;
    this.web3.eth.accounts.wallet.add(metaFactory.getPrivateKey());
    for (const data of metaFactory.getContracts()) {
      this[`${data.name}Instance`] = await this.initInstance
      (metaFactory.getUserAddress(), data.address, data.json);
    }
    event.emitEvent(constant.BC_INITIALIZED_EVENT);
  }

  async getNetId() {
    return await this.web3.eth.getChainId();
  }

  async getCoinInstance(address) {
    if (this.coinInstanceHash[address]) {
      return this.coinInstanceHash[address];
    }
    const instance = new this.web3.eth.Contract(
      ERC20ABI,
      address,
      {
        from: metaFactory.getUserAddress()
      }
    );
    this.coinInstanceHash[address] = instance;
    return instance;
  }

  async increaseAllowance(address, price) {
    const coinInstance = await this.getCoinInstance(address);
    const mallAddress = metaFactory.getContractByName('mall')['address'];
    const res = await coinInstance.methods.increaseAllowance(mallAddress, price).send({ gas: 1000000 });
    console.log('increaseAllowance', res);
  }

  async getBalance(address) {
    const coinInstance = await this.getCoinInstance(address);
    return await coinInstance.methods.balanceOf(metaFactory.getUserAddress()).call();
  }

}

module.exports = new BlockChain();