pragma solidity ^0.4.18;

contract CrowdsaleParameters {
    ///////////////////////////////////////////////////////////////////////////
    // Production Config
    ///////////////////////////////////////////////////////////////////////////

    // ICO period timestamps:
    // 1524182400 = April 20, 2018.
    // 1529452800 = June 20, 2018.

    uint256 public constant generalSaleStartDate = 1524182400;
    uint256 public constant generalSaleEndDate = 1529452800;

    ///////////////////////////////////////////////////////////////////////////
    // QA Config
    ///////////////////////////////////////////////////////////////////////////


    ///////////////////////////////////////////////////////////////////////////
    // Configuration Independent Parameters
    ///////////////////////////////////////////////////////////////////////////

    struct AddressTokenAllocation {
        address addr;
        uint256 amount;
    }

    AddressTokenAllocation internal generalSaleWallet = AddressTokenAllocation(0x5aCdaeF4fa410F38bC26003d0F441d99BB19265A, 22800000);
    AddressTokenAllocation internal bounty = AddressTokenAllocation(0xc1C77Ff863bdE913DD53fD6cfE2c68Dfd5AE4f7F, 2000000);
    AddressTokenAllocation internal partners = AddressTokenAllocation(0x307744026f34015111B04ea4D3A8dB9FdA2650bb, 3200000);
    AddressTokenAllocation internal team = AddressTokenAllocation(0xCC4271d219a2c33a92aAcB4C8D010e9FBf664D1c, 12000000);
    AddressTokenAllocation internal featureDevelopment = AddressTokenAllocation(0x06281A31e1FfaC1d3877b29150bdBE93073E043B, 0);
}


contract Owned {
    address public owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
    *  Constructor
    *
    *  Sets contract owner to address of constructor caller
    */
    function Owned() public {
        owner = msg.sender;
    }

    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    /**
    *  Change Owner
    *
    *  Changes ownership of this contract. Only owner can call this method.
    *
    * @param newOwner - new owner's address
    */
    function changeOwner(address newOwner) onlyOwner public {
        require(newOwner != address(0));
        require(newOwner != owner);
        OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }
}

library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0) {
      return 0;
    }
    uint256 c = a * b;
    assert(c / a == b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  /**
  * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

contract SBIToken is Owned, CrowdsaleParameters {
    using SafeMath for uint256;
    /* Public variables of the token */
    string public standard = 'ERC20/SBI';
    string public name = 'Subsoil Blockchain Investitions';
    string public symbol = 'SBI';
    uint8 public decimals = 18;

    /* Arrays of all balances */
    mapping (address => uint256) private balances;
    mapping (address => mapping (address => uint256)) private allowed;
    mapping (address => mapping (address => bool)) private allowanceUsed;

    /* This generates a public event on the blockchain that will notify clients */

    event Transfer(address indexed from, address indexed to, uint tokens);
    event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
    event Issuance(uint256 _amount); // triggered when the total supply is increased
    event Destruction(uint256 _amount); // triggered when the total supply is decreased

    event NewSBIToken(address _token);

    /* Miscellaneous */
    uint256 public totalSupply = 0; // 40000000;
    bool public transfersEnabled = true;

    /**
    *  Constructor
    *
    *  Initializes contract with initial supply tokens to the creator of the contract
    */

    function SBIToken() public {
        owner = msg.sender;
        mintToken(generalSaleWallet);
        mintToken(bounty);
        mintToken(partners);
        mintToken(team);
        NewSBIToken(address(this));
    }

    modifier transfersAllowed {
        require(transfersEnabled);
        _;
    }

    modifier onlyPayloadSize(uint size) {
        assert(msg.data.length >= size + 4);
        _;
    }

    /**
    *  1. Associate crowdsale contract address with this Token
    *  2. Allocate general sale amount
    *
    * @param _crowdsaleAddress - crowdsale contract address
    */
    function approveCrowdsale(address _crowdsaleAddress) external onlyOwner {
        approveAllocation(generalSaleWallet, _crowdsaleAddress);
    }

    function approveAllocation(AddressTokenAllocation tokenAllocation, address _crowdsaleAddress) internal {
        uint uintDecimals = decimals;
        uint exponent = 10**uintDecimals;
        uint amount = tokenAllocation.amount * exponent;

        allowed[tokenAllocation.addr][_crowdsaleAddress] = amount;
        Approval(tokenAllocation.addr, _crowdsaleAddress, amount);
    }

    /**
    *  Get token balance of an address
    *
    * @param _address - address to query
    * @return Token balance of _address
    */
    function balanceOf(address _address) public constant returns (uint256 balance) {
        return balances[_address];
    }

    /**
    *  Get token amount allocated for a transaction from _owner to _spender addresses
    *
    * @param _owner - owner address, i.e. address to transfer from
    * @param _spender - spender address, i.e. address to transfer to
    * @return Remaining amount allowed to be transferred
    */

    function allowance(address _owner, address _spender) public constant returns (uint256 remaining) {
        return allowed[_owner][_spender];
    }

    /**
    *  Send coins from sender's address to address specified in parameters
    *
    * @param _to - address to send to
    * @param _value - amount to send in Wei
    */

    function transfer(address _to, uint256 _value) public transfersAllowed onlyPayloadSize(2*32) returns (bool success) {
        require(_to != address(0));
        require(_value <= balances[msg.sender]);
        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        Transfer(msg.sender, _to, _value);
        return true;
    }

    /**
    *  Create token and credit it to target address
    *  Created tokens need to vest
    *
    */
    function mintToken(AddressTokenAllocation tokenAllocation) internal {

        uint uintDecimals = decimals;
        uint exponent = 10**uintDecimals;
        uint mintedAmount = tokenAllocation.amount * exponent;

        // Mint happens right here: Balance becomes non-zero from zero
        balances[tokenAllocation.addr] += mintedAmount;
        totalSupply += mintedAmount;

        // Emit Issue and Transfer events
        Issuance(mintedAmount);
        Transfer(address(this), tokenAllocation.addr, mintedAmount);
    }

    /**
    *  Allow another contract to spend some tokens on your behalf
    *
    * @param _spender - address to allocate tokens for
    * @param _value - number of tokens to allocate
    * @return True in case of success, otherwise false
    */
    function approve(address _spender, uint256 _value) public onlyPayloadSize(2*32) returns (bool success) {
        require(_value == 0 || allowanceUsed[msg.sender][_spender] == false);
        allowed[msg.sender][_spender] = _value;
        allowanceUsed[msg.sender][_spender] = false;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    /**
    *  A contract attempts to get the coins. Tokens should be previously allocated
    *
    * @param _to - address to transfer tokens to
    * @param _from - address to transfer tokens from
    * @param _value - number of tokens to transfer
    * @return True in case of success, otherwise false
    */
    function transferFrom(address _from, address _to, uint256 _value) public transfersAllowed onlyPayloadSize(3*32) returns (bool success) {
        require(_to != address(0));
        require(_value <= balances[_from]);
        require(_value <= allowed[_from][msg.sender]);
        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        Transfer(_from, _to, _value);
        return true;
    }

    /**
    *  Default method
    *
    *  This unnamed function is called whenever someone tries to send ether to
    *  it. Just revert transaction because there is nothing that Token can do
    *  with incoming ether.
    *
    *  Missing payable modifier prevents accidental sending of ether
    */
    function() public {}

    /**
    *  Enable or disable transfers
    *
    * @param _enable - True = enable, False = disable
    */
    function toggleTransfers(bool _enable) external onlyOwner {
        transfersEnabled = _enable;
    }
}