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

    string public symbol;
    string public  name;
    uint8 public decimals;
    uint256 _totalSupply;
    uint256 sale;
    uint256 reserve;
    uint phase;
    uint256 public totalEthDeposit;
    uint256 public deposits=0;

    mapping(address => uint) public balances;
    mapping(address => mapping(address => uint)) allowed;
    mapping(address => uint256) public ethdeposit;
    


    // ------------------------------------------------------------------------
    // Constructor
    // ------------------------------------------------------------------------
    constructor() public { 
        name = "DAOSWAP";
        symbol = "DVS";
        decimals = 18;
        _totalSupply = 50000 * 10**uint(decimals);
        sale = 25000 * 10**uint(decimals);
        reserve = 25000 * 10**uint(decimals);
        phase = 1;
        balances[owner] = reserve;
        emit Transfer(address(0), owner, reserve);
        
        balances[address(this)] = sale;
        emit Transfer(address(0), address(this), sale);
    }
    // ------------------------------------------------------------------------
    
    function() external payable {
        buyTokens(msg.sender , msg.value);
    }
    
    function phasechange() onlyOwner public{
        //require(msg.sender==owner,"Only Owner Can Change Phase!");
        phase = 2;
    } 
    
    function buyTokens(address beneficiary , uint256 amount) internal {
        require(beneficiary != address(0),"Invalid Address!");
        require(amount >= 1*1e17 && amount <= 50*1e18 , "Invalid Amount!");
        uint256 tokens;
        uint256 weiAmount = amount;
        
        deposits++;
        totalEthDeposit = totalEthDeposit + amount;
        ethdeposit[beneficiary] = ethdeposit[beneficiary] + amount;
        
        if(balances[address(this)] <= 12500*1e18){
            phase=2;
        }
        
        // calculate token amount to be created
        if(phase == 1)
            tokens = weiAmount.mul(50);
        else
            tokens = weiAmount.mul(36);
            
        require(balances[address(this)] >=tokens , "Tokens Not Available!");
        
            
        balances[beneficiary] = balances[beneficiary] + tokens;
        balances[address(this)] = balances[address(this)] - tokens;
        emit Transfer(address(this), beneficiary, tokens);
        
        //mint(beneficiary,tokens);
        //emit Transfer(address(this), beneficiary, tokens);
       
        
        forwardFunds();
    }
    
    function forwardFunds() internal {
        owner.transfer(msg.value);
        
    }
    
   
    //-------------------------------------------------------------------------


    // ------------------------------------------------------------------------
    // Total supply
    // ------------------------------------------------------------------------
    function totalSupply() public view returns (uint) {
        return _totalSupply.sub(balances[address(0)]);
    }


    // ------------------------------------------------------------------------
    // Get the token balance for account `tokenOwner`
    // ------------------------------------------------------------------------
    function balanceOf(address tokenOwner) public view returns (uint 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, 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;
    }


    // ------------------------------------------------------------------------
    // Token owner can approve for `spender` to transferFrom(...) `tokens`
    // from the token owner's account
    //
    // https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
    // recommends that there are no checks for the approval double-spend attack
    // as this should be implemented in user interfaces
    // ------------------------------------------------------------------------
    function approve(address spender, uint tokens) public 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, 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;
    }


    // ------------------------------------------------------------------------
    // 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 view returns (uint remaining) {
        return allowed[tokenOwner][spender];
    }


    // ------------------------------------------------------------------------
    // Token owner can approve for `spender` to transferFrom(...) `tokens`
    // from the token owner's account. The `spender` contract function
    // `receiveApproval(...)` is then executed
    // ------------------------------------------------------------------------
    function approveAndCall(address spender, uint tokens, bytes memory data) public returns (bool success) {
        allowed[msg.sender][spender] = tokens;
        emit Approval(msg.sender, spender, tokens);
        ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, address(this), data);
        return true;
    }


    // ------------------------------------------------------------------------
    // Don't accept ETH
    // ------------------------------------------------------------------------
/*    function () external payable {
        revert();
    }
*/

    // ------------------------------------------------------------------------
    // Owner can transfer out any accidentally sent ERC20 tokens
    // ------------------------------------------------------------------------
    function transferAnyERC20Token(address tokenAddress, uint tokens) public onlyOwner returns (bool success) {
        return ERC20Interface(tokenAddress).transfer(owner, tokens);
    }
    
    /*
     function mint(address account, uint256 amount) internal returns (bool) {
        require(account != address(0), "ERC20: mint to the zero address");
        _totalSupply = _totalSupply.add(amount);
        balances[account] = balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }
    */
    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
     
    function burn(address account, uint256 amount) onlyOwner public returns (bool) {
        require(account != address(0), "ERC20: burn from the zero address");

        balances[account] = balances[account].sub(amount);
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }
   
    
    

}
// ----------------------------------------------------------------------------
// ERC20 Token, with the addition of symbol, name and decimals and a
// fixed supply
// ----------------------------------------------------------------------------
function approve(address spender, uint tokens) public returns (bool success) {
        allowed[msg.sender][spender] = tokens;
        emit Approval(msg.sender, spender, tokens);
        return true;
    }
// ------------------------------------------------------------------------
// Token owner can approve for `spender` to transferFrom(...) `tokens`
// from the token owner's account
//
// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
// recommends that there are no checks for the approval double-spend attack
// as this should be implemented in user interfaces
// ------------------------------------------------------------------------