pragma solidity ^0.4.26;

// ---------------------------------------------------------------------------------------------------------
// 'UniversalCoin' ERC223 token contract
//
// Deployed to : 0xeA5194232f499925c3F6ADF8CB4F26646BA06481
// Symbol      : UVC
// Name        : UniversalCoin
// Total supply: 40,000,000,000
// Decimals    : 5
// Published   : 27 October 2019
//
// Adapted from OpenZeppelin (ERC20) + Saturn DAO contracts by @Dan_UniversalCoin and @Deano_UniversalCoin
// ---------------------------------------------------------------------------------------------------------

interface IERC223 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);

    function transfer(address recipient, uint256 amount) external returns (bool);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    function transfer(address recipient, uint256 amount, bytes data) external returns (bool);

    event ERC223Transfer(address indexed from, address indexed to, uint256 value, bytes data);
}

contract Context {
    constructor () internal { }
    function _msgSender() internal view returns (address) {return msg.sender;}
    function _msgData() internal view returns (bytes memory) {
        this;
        return msg.data;
    }
}

contract ERC223 is Context, IERC223 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    function isContract(address account) private view returns (bool) {
        uint length;
        assembly { length := extcodesize(account) }
        if(length>0) {
            return true;
        }
        else {
            return false;
        }
    }

    function totalSupply() public view returns (uint256) {return _totalSupply;}
    function balanceOf(address account) public view returns (uint256) {return _balances[account];}
    function allowance(address owner, address spender) public view returns (uint256) {return _allowances[owner][spender];}

    function transfer(address recipient, uint256 amount) external returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function transfer(address recipient, uint256 amount, bytes data) external returns (bool) {
        _transfer(_msgSender(), recipient, amount, data);
        return true;
    }

    function approve(address spender, uint256 amount) public returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    // Note this function requires explicit workaround from remaining ERC223 functionality otherwise function fails
    function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
        require(sender != address(0), "Transfer from the zero address");
        require(recipient != address(0), "Transfer to the zero address");
        _balances[sender] = _balances[sender].sub(amount, "Transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "Transfer amount exceeds allowance"));
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "Decreased allowance below zero"));
        return true;
    }

    function _transfer(address sender, address recipient, uint256 amount) internal {
        bytes memory empty = hex"00000000";
        if(isContract(recipient)) {
            return _transferToContract(sender, recipient, amount, empty);
        } else {
            return _transferToAddress(sender, recipient, amount, empty);
        }
    }

    function _transfer(address sender, address recipient, uint256 amount, bytes memory data) internal {
        if(isContract(recipient)) {
            return _transferToContract(sender, recipient, amount, data);
        } else {
            return _transferToAddress(sender, recipient, amount, data);
        }
    }

    function _transferToContract(address sender, address recipient, uint256 amount, bytes memory data) internal {
        require(sender != address(0), "Transfer from the zero address");
        require(recipient != address(0), "Transfer to the zero address");
        _balances[sender] = _balances[sender].sub(amount, "Transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        IERC223Recipient receiver = IERC223Recipient(recipient);
        receiver.tokenFallback(msg.sender, amount, data);
        emit Transfer(sender, recipient, amount);
        emit ERC223Transfer(sender, recipient, amount, data);
    }

    function _transferToAddress(address sender, address recipient, uint256 amount, bytes memory data) internal {
        require(sender != address(0), "Transfer from the zero address");
        require(recipient != address(0), "Transfer to the zero address");
        _balances[sender] = _balances[sender].sub(amount, "Transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
        emit ERC223Transfer(sender, recipient, amount, data);
    }

    function _mint(address account, uint256 amount) internal {
        bytes memory empty = hex"00000000";
        require(account != address(0), "Mint to the zero address");
        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
        emit ERC223Transfer(address(0), account, amount, empty);
    }

    function _burn(address account, uint256 amount) internal {
        bytes memory empty = hex"00000000";
        require(account != address(0), "Burn from the zero address");
        _balances[account] = _balances[account].sub(amount, "Burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
        emit ERC223Transfer(account, address(0), amount, empty);
    }

    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "Approve from the zero address");
        require(spender != address(0), "Approve to the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "Burn amount exceeds allowance"));
    }
}

contract ERC223Burnable is Context, ERC223 {
    function burn(uint256 amount) public {_burn(_msgSender(), amount);}
    function burnFrom(address account, uint256 amount) public {_burnFrom(account, amount);}
}

contract ERC223Detailed is IERC223 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    function name() public view returns (string memory) {return _name;}
    function symbol() public view returns (string memory) {return _symbol;}
    function decimals() public view returns (uint8) {return _decimals;}
}

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {return sub(a, b, "SafeMath: subtraction overflow");}
    function div(uint256 a, uint256 b) internal pure returns (uint256) {return div(a, b, "SafeMath: division by zero");}
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {return mod(a, b, "SafeMath: modulo by zero");}

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {return 0;}
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }

    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

contract IERC223Recipient {
    function tokenFallback(address _from, uint256 _value, bytes memory _data) public;
}

contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {return _owner;}
    function isOwner() public view returns (bool) {return _msgSender() == _owner;}
    function transferOwnership(address newOwner) public onlyOwner {_transferOwnership(newOwner);}

    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

contract UniversalCoin is Context, Ownable, ERC223, ERC223Detailed, ERC223Burnable {
    constructor () public ERC223Detailed("UniversalCoin", "UVC", 5) {
        _mint(_msgSender(), 40000000000 * (10 ** 5));
    }
}

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