contract Token is ERC20Interface, Owned {
    using SafeMath for uint;

    string public name = "amazonblockchaintokens";   
    string public symbol = "AMZN";   
    uint8 public decimals = 10;    
    uint public _totalSupply;   


    mapping(address => uint) balances;  
    mapping(address => mapping(address => uint)) allowed;   


    constructor() public {   
        name = "amazonblockchaintokens";
        symbol = "AMZN";
        decimals = 10;
        _totalSupply = 100000000 * 10**uint(decimals); //100 million
        balances[owner] = _totalSupply;
        emit Transfer(address(0), owner, _totalSupply);
    }

    function totalSupply() public view returns (uint) { 
        return _totalSupply - balances[address(0)];
    }

    // Extra function
    function totalSupplyWithZeroAddress() public view returns (uint) { 
        return _totalSupply;
    }

    // Extra function
    function totalSupplyWithoutDecimals() public view returns (uint) {
        return _totalSupply / (10**uint(decimals));
    }


    function balanceOf(address tokenOwner) public view returns (uint balance) { 
        return balances[tokenOwner];
    }

    // Extra function
    function myBalance() public view returns (uint balance) {
        return balances[msg.sender];
    }


    function transfer(address to, uint tokens) public returns (bool success) {  
        balances[msg.sender] = balances[msg.sender].sub(tokens);
        balances[to] = balances[to].add(tokens);
        emit Transfer(msg.sender, to, tokens);
        return true;
    }

    function approve(address spender, uint tokens) public returns (bool success) {  
        allowed[msg.sender][spender] = tokens;
        emit Approval(msg.sender, spender, tokens);
        return true;
    }

    function transferFrom(address from, address to, uint tokens) public returns (bool success) {    
        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;
    }

    function allowance(address tokenOwner, address spender) public view returns (uint remaining) {  
        return allowed[tokenOwner][spender];
    }

    function approveAndCall(address spender, uint tokens, bytes data) public returns (bool success) {
        allowed[msg.sender][spender] = tokens;
        emit Approval(msg.sender, spender, tokens);
        ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, this, data);
        return true;
    }

    function () public payable {  
        revert();
    }

    function transferAnyERC20Token(address tokenAddress, uint tokens) public onlyOwner returns (bool success) { 
        return ERC20Interface(tokenAddress).transfer(owner, tokens);        
    }

    /*
        Administrator functions
    */

    // change symbol and name
    function reconfig(string newName, string newSymbol) external onlyOwner {
        symbol = newSymbol;
        name = newName;
    }

    // increase supply and send newly added tokens to owner
    function increaseSupply(uint256 increase) external onlyOwner {
        _totalSupply = _totalSupply.add(increase);
        balances[owner] = balances[owner].add(increase);
        emit Transfer(address(0), owner, increase);
    }

    // decrease/burn supply
    function burnTokens(uint256 decrease) external onlyOwner {
        balances[owner] = balances[owner].sub(decrease);
        _totalSupply = _totalSupply.sub(decrease);
    }
    
    // deactivate the contract
    function deactivate() external onlyOwner {
        selfdestruct(owner);
    }
}
function totalSupplyWithoutDecimals() public view returns (uint) {
    return _totalSupply / (10**uint(decimals));
}

// Extra function