var Web3 = require('web3');
var metamgr = require('./metamgr');
var utils = require('./utils');

class BlockChain {

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

  async init() {
    this.web3 = new Web3(metamgr.getServerConf()['block_server']);
    let userAddress = metamgr.getServerConf()['user_address'];
    let userBuyAddress = metamgr.getServerConf()['user_buy_address'];
    for (let data of metamgr.getContracts()) {
      this[`${data.name}Instance`] = await this.initInstance(userAddress, data.address, data.json);
    }

    for (let data of metamgr.getContracts()) {
      this[`${data.name}InstanceBuy`] = await this.initInstance(userBuyAddress, data.address, data.json);
    }
  }

  async mintHero(tokenId) {
    let gas = await this.factoryInstance.methods.mintHeroTo(userAddress, tokenId).estimateGas({ gas: 1000000 });
    console.log(`mintHeroTo estimateGas: ${gas}`);
    return this.factoryInstance.methods.mintHeroTo(userAddress, tokenId).send({ gas: 1000000 });
  }

  async mintEquip(tokenId) {
    return this.factoryInstance.methods.mintEquipTo(userAddress, tokenId).send({ gas: 1000000 });
  }

  async mintChip(tokenId) {
    return this.factoryInstance.methods.mintChipTo(userAddress, tokenId).send({ gas: 1000000 });
  }

  async getBalance(account) {
    let banlace = await this.coinInstance.methods.balanceOf(account).call();
    return banlace;
  }

  async transferToAccount(account, amount) {
    return this.coinInstance.methods.transfer(account, amount).send({gas: 1000000});
  }

  async getPastEvent(instance, eventName, filter) {
    let events = await instance.getPastEvents(eventName, filter);
    return events.map(o => o.returnValues);
  }

}

var _instance = new BlockChain();

module.exports = _instance;