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Initial Coin Offering (ICO) smart contract written in Solidity. This repository budling with hardhat and openzeppelin with best practice code pattern.

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# Initial Coin Offering (ICO) contract

Tutorial using Hardhat(Buidler) to complie, deploy and automated unit tests Solidity smart contract.  
you use this repository as Initial Coin Offering (ICO) contract template or ERC20 template.   
To run these tutorials, you must have the following installed:

- [nodejs](https://nodejs.org/en/)

- [nvm](https://github.com/nvm-sh/nvm)

```bash
$ npm install
```

to compile your smart contract to get an ABI and artifact of a smart contract.

```bash
$ npm run compile
```

for a unit testing smart contract using the command line.

```
$ npm run test
```
expecting `sample-test.js` result.
```bash

Initial Coin Offering (ICO) contract
    ✓ Assigns initial balance (97ms)
    ✓ Do not have permission to minting token (95ms)
    ✓ Do not have permission to burning token (74ms)
    ✓ Buy token with ether (212ms)
    ✓ Do not have permission to withdraw ether from contract (69ms)
    ✓ Transfer adds amount to destination account (99ms)
    ✓ Transfer emits event (132ms)
    ✓ Can not transfer above the amount (63ms)
    ✓ Can not transfer from empty account (77ms)
    ✓ Minting token (100ms)
    ✓ Burning token (73ms)
    ✓ Withdraw ether from contract (61ms)
    ✓ Do not have enough ether to buy token (30ms)

13 passing (2s)

```

after testing if you want to deploy the contract using the command line.

```bash

$ npm run test-rpc
# Open another Terminal
$ npm run deploy-local

# result in npx hardhat node Terminal
web3_clientVersion
eth_chainId
eth_accounts
eth_chainId
eth_estimateGas
eth_gasPrice
eth_sendTransaction
  Contract deployment: <UnrecognizedContract>
  Contract address:    0x5fb...aa3
  Transaction:         0x4d8...945
  From:                0xf39...266
  Value:               0 ETH
  Gas used:            323170 of 323170
  Block #1:            0xee6...85d

eth_chainId
eth_getTransactionByHash
eth_blockNumber
eth_chainId (2)
eth_getTransactionReceipt

# result in npx hardhat run Terminal
Initial Coin Offering (ICO) contract deployed to: 0x5Fb...aa3

```
your can edit deploy network endpoint at `hardhat.config.js`.

```javascript
module.exports = {
  networks: {
        {
        localhost: {
          url: "http://127.0.0.1:8545"
        },
        hardhat: {
          // See its defaults
        }
  }
};

```
Example customized function  
If you want to pay token fee to the miner or validator in the network.
```javascript
    // pragma solidity 0.8.0
    // Solidity 0.8.X has an integrated SafeMath Library
    // override function transfer to distribute fee to miner or validator in the network
    /* Diagram transfer with token fees
      ##### Before #####
      A balance: 101
      B balance: 0
      C balance: 0

##### After #####
      A balance: 0
      B balance: 100
      C balance: 1
    */
    function transfer(address account,uint256 amount) public override returns(bool){
        require(amount % 10 != 0, "ERC20: insufficient funds");
        uint256 fee = amount % 10;
        _transfer(msg.sender,account,amount-fee);
        _transfer(msg.sender,block.coinbase,fee);
        return true;
    }
```

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