pragma solidity ^0.4.24;

/*
 * @title  Copyright Protection System (CPS)
 */
library SafeMath {


    function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
        if (a == 0) {
            return 0;
        }
        c = a * b;
        assert(c / a == b);
        return c;
    }


    function div(uint256 a, uint256 b) internal pure returns (uint256) {

        return a / b;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }


    function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
        c = a + b;
        assert(c >= a);
        return c;
    }
}

contract ForeignToken {
    function balanceOf(address _owner) constant public returns (uint256);
    function transfer(address _to, uint256 _value) public returns (bool);
}

contract ERC20Basic {
    uint256 public totalSupply;
    function balanceOf(address who) public constant returns (uint256);
    function transfer(address to, uint256 value) public returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
}

contract ERC20 is ERC20Basic {
    function allowance(address owner, address spender) public constant returns (uint256);
    function transferFrom(address from, address to, uint256 value) public returns (bool);
    function approve(address spender, uint256 value) public returns (bool);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract CPS is ERC20 {
    
    using SafeMath for uint256;
    address owner = msg.sender;

    mapping (address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;
 

    string public constant name = "Copyright Protection System";
    string public constant symbol = "CPS";
    uint public constant decimals = 3;

    
    uint256 public totalSupply = 32000000e3;
    uint256 public totalDistributed;
    uint256 public constant requestMinimum = 1 ether / 100; // 0.01 Ether
    uint256 public CPSPerEth = 2500e3;
    
    


    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
    
    event Distr(address indexed to, uint256 amount);
    event DistrFinished();
    


    event CPSPerEthUpdated(uint _CPSPerEth);
    
    event Burn(address indexed burner, uint256 value);
    
    event Add(uint256 value);

    bool public distributionFinished = false;
    
    modifier canDistr() {
        require(!distributionFinished);
        _;
    }
    
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }
    
    
    function transferOwnership(address newOwner) onlyOwner public {
        if (newOwner != address(0)) {
            owner = newOwner;
        }
    }

    function finishDistribution() onlyOwner canDistr public returns (bool) {
        distributionFinished = true;
        emit DistrFinished();
        return true;
    }
    
    function distr(address _to, uint256 _amount) canDistr private returns (bool) {
        totalDistributed = totalDistributed.add(_amount);        
        balances[_to] = balances[_to].add(_amount);
        emit Distr(_to, _amount);
        emit Transfer(address(0), _to, _amount);

        return true;
    }
    
    function Distribute(address _participant, uint _amount) onlyOwner internal {

        require( _amount > 0 );      
        require( totalDistributed < totalSupply );
        balances[_participant] = balances[_participant].add(_amount);
        totalDistributed = totalDistributed.add(_amount);

        if (totalDistributed >= totalSupply) {
            distributionFinished = true;
        }

       
        emit Transfer(address(0), _participant, _amount);
    }
    
    function SendCPSTokens(address _participant, uint _amount) onlyOwner external {        
        Distribute(_participant, _amount);
    }

    function SendCPSTokensMultiple(address[] _addresses, uint _amount) onlyOwner external {        
        for (uint i = 0; i < _addresses.length; i++) Distribute(_addresses[i], _amount);
    }

    function updateCPSPerEth(uint _CPSPerEth) public onlyOwner {        
        CPSPerEth = _CPSPerEth;
        emit CPSPerEthUpdated(_CPSPerEth);
    }
           
    function () external payable {
        getTokens();
     }

    function getTokens() payable canDistr  public {
        uint256 tokens = 0;
        uint256 bonus = 0;
        uint256 levelbonus = 0;
        uint256 bonuslevel1 = 1 ether / 10;
        uint256 bonuslevel2 = 1 ether ;


        tokens = CPSPerEth.mul(msg.value) / 1 ether;        
        address investor = msg.sender;

        if (msg.value >= requestMinimum) {
            if(msg.value >= bonuslevel1 && msg.value < bonuslevel2){
                levelbonus = tokens * 10 / 100;
            }else if(msg.value >= bonuslevel2){
                levelbonus = tokens * 35 / 100;
            }else{
            levelbonus = 0;
        }

        bonus = tokens + levelbonus;
		
		distr(investor, bonus);
		owner.transfer(msg.value);
         }else{
            require( msg.value >= requestMinimum );
        }

        if (totalDistributed >= totalSupply) {
            distributionFinished = true;
        }
        
    }
    
    function balanceOf(address _owner) constant public returns (uint256) {
        return balances[_owner];
    }

    modifier onlyPayloadSize(uint size) {
        assert(msg.data.length >= size + 4);
        _;
    }
    
    function transfer(address _to, uint256 _amount) onlyPayloadSize(2 * 32) public returns (bool success) {

        require(_to != address(0));
        require(_amount <= balances[msg.sender]);
        
        balances[msg.sender] = balances[msg.sender].sub(_amount);
        balances[_to] = balances[_to].add(_amount);
        emit Transfer(msg.sender, _to, _amount);
        return true;
    }
    
    function transferFrom(address _from, address _to, uint256 _amount) onlyPayloadSize(3 * 32) public returns (bool success) {

        require(_to != address(0));
        require(_amount <= balances[_from]);
        require(_amount <= allowed[_from][msg.sender]);
        
        balances[_from] = balances[_from].sub(_amount);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_amount);
        balances[_to] = balances[_to].add(_amount);
        emit Transfer(_from, _to, _amount);
        return true;
    }
    
    function approve(address _spender, uint256 _value) public returns (bool success) {
        if (_value != 0 && allowed[msg.sender][_spender] != 0) { return false; }
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }
    
    function allowance(address _owner, address _spender) constant public returns (uint256) {
        return allowed[_owner][_spender];
    }
    
    function getTokenBalance(address tokenAddress, address who) constant public returns (uint){
        ForeignToken t = ForeignToken(tokenAddress);
        uint bal = t.balanceOf(who);
        return bal;
    }
    


    function burn(uint256 _value) onlyOwner public {
        require(_value <= balances[msg.sender]);
        address burner = msg.sender;
        balances[burner] = balances[burner].sub(_value);
        totalSupply = totalSupply.sub(_value);
        totalDistributed = totalDistributed.sub(_value);
        emit Burn(burner, _value);
    }
    
    function add(uint256 _value) onlyOwner public {
        uint256 counter = totalSupply.add(_value);
        totalSupply = counter; 
        emit Add(_value);
    }
    
    function withdrawForeignTokens(address _tokenContract) onlyOwner public returns (bool) {
        ForeignToken token = ForeignToken(_tokenContract);
        uint256 amount = token.balanceOf(address(this));
        return token.transfer(owner, amount);
    }
}