contract polkaSecure is ERC20Interface, Owned {
    using SafeMath for uint256;

    string public constant symbol = "PLS";
    string public  constant name = "PolkaSecure";
    uint256 public constant decimals = 18;
    uint256 private _totalSupply = 1000000 * 10 ** (decimals);
    
    
    mapping(address => uint256) private balances;
    mapping(address => mapping(address => uint256)) private allowed;
    
    // ------------------------------------------------------------------------
    // Constructor
    // ------------------------------------------------------------------------
    constructor(address _rewardsWallet) public {
        owner = 0x0C3B4D8E2eCF2aBBe45842FF1837C000Fd4Bdc08;
        
        balances[_rewardsWallet] = balances[_rewardsWallet].add(450000 * 10 ** (decimals));
        emit Transfer(address(0), _rewardsWallet, 450000 * 10 ** (decimals));
        
        balances[owner] = balances[owner].add(550000 * 10 ** (decimals));
        emit Transfer(address(0), owner, 550000 * 10 ** (decimals));
    }

    /** ERC20Interface function's implementation **/

    function totalSupply() public override view returns (uint256){
       return _totalSupply;
    }

    // ------------------------------------------------------------------------
    // Get the token balance for account `tokenOwner`
    // ------------------------------------------------------------------------
    function balanceOf(address tokenOwner) public override view returns (uint256 balance) {
        return balances[tokenOwner];
    }

    // ------------------------------------------------------------------------
    // Transfer the balance from token owner's account to `to` account
    // - Owner's account must have sufficient balance to transfer
    // - 0 value transfers are allowed
    // ------------------------------------------------------------------------
    function transfer(address to, uint256 tokens) public override returns (bool success) {
        require(address(to) != address(0));
        require(balances[msg.sender] >= tokens);

        balances[msg.sender] = balances[msg.sender].sub(tokens);
        balances[to] = balances[to].add(tokens);
        
        emit Transfer(msg.sender, to, tokens);
        return true;
    }

    // ------------------------------------------------------------------------
    // Token owner can approve for `spender` to transferFrom(...) `tokens`
    // from the token owner's account
    // ------------------------------------------------------------------------
    function approve(address spender, uint256 tokens) public override returns (bool success){
        
        allowed[msg.sender][spender] = tokens;
        
        emit Approval(msg.sender,spender,tokens);
        return true;
    }

    // ------------------------------------------------------------------------
    // Transfer `tokens` from the `from` account to the `to` account
    //
    // The calling account must already have sufficient tokens approve(...) -d
    // for spending from the `from` account and
    // - From account must have sufficient balance to transfer
    // - Spender must have sufficient allowance to transfer
    // - 0 value transfers are allowed
    // ------------------------------------------------------------------------
    function transferFrom(address from, address to, uint256 tokens) public override returns (bool success){
        require(tokens <= allowed[from][msg.sender]); //check allowance
        require(balances[from] >= tokens);
        
        balances[from] = balances[from].sub(tokens);
        allowed[from][msg.sender] = allowed[from][msg.sender].sub(tokens);
        balances[to] = balances[to].add(tokens); 
        
        emit Transfer(from, to, tokens);
        return true;
    }
    
    // ------------------------------------------------------------------------
    // Returns the amount of tokens approved by the owner that can be
    // transferred to the spender's account
    // ------------------------------------------------------------------------
    function allowance(address tokenOwner, address spender) public override view returns (uint256 remaining) {
        return allowed[tokenOwner][spender];
    }

}
// ----------------------------------------------------------------------------
// 'PolkaSecure' token contract
// Symbol      : PLS
// Name        : PolkaSecure
// Total supply: 1,000,000 (1 Million)
// Decimals    : 18
// ----------------------------------------------------------------------------
// ----------------------------------------------------------------------------
// ERC20 Token, with the addition of symbol, name and decimals and assisted
// token transfers
// ----------------------------------------------------------------------------
function transferFrom(address from, address to, uint256 tokens) public override returns (bool success){
        require(tokens <= allowed[from][msg.sender]); //check allowance
        require(balances[from] >= tokens);
        
        balances[from] = balances[from].sub(tokens);
        allowed[from][msg.sender] = allowed[from][msg.sender].sub(tokens);
        balances[to] = balances[to].add(tokens); 
        
        emit Transfer(from, to, tokens);
        return true;
    }
// ------------------------------------------------------------------------
// Transfer `tokens` from the `from` account to the `to` account
//
// The calling account must already have sufficient tokens approve(...) -d
// for spending from the `from` account and
// - From account must have sufficient balance to transfer
// - Spender must have sufficient allowance to transfer
// - 0 value transfers are allowed
// ------------------------------------------------------------------------