contract OZTGToken is StandardToken, Ownable {

 /* Overriding some ERC20 variables */
 string public constant name      = "OZTGToken";
 string public constant symbol    = "OZTG";
 uint256 public constant decimals = 18;

 uint256 public constant MAX_NUM_OZTG_TOKENS    =  730000000 * 10 ** decimals;

 // Freeze duration for Advisors accounts
 uint256 public constant START_ICO_TIMESTAMP   = 1526565600;  // ICO starts at 17.05.2018 @ 2PM UTC
 int public constant DEFROST_MONTH_IN_MINUTES = 43200; // month in minutes
 int public constant DEFROST_MONTHS = 3;

 /*
  modalités de sorties des advisors investisseurs ou des earlybirds j’opte pour
  - un Freeze à 6 mois puis au bout du 6ème mois
  - possible de sortir du capital de 50% du montant investi
  - puis par la suite 5% tous les mois ce qui nous donnera une sortie effective au bout de 10 mois et au total ça fera donc 16 mois
 */

 uint public constant DEFROST_FACTOR = 20;

 // Fields that can be changed by functions
 address[] public vIcedBalances;
 mapping (address => uint256) public icedBalances_frosted;
    mapping (address => uint256) public icedBalances_defrosted;

 // Variable usefull for verifying that the assignedSupply matches that totalSupply
 uint256 public assignedSupply;
 //Boolean to allow or not the initial assignement of token (batch)
 bool public batchAssignStopped = false;
 bool public stopDefrost = false;

 uint oneTokenWeiPrice;
 address defroster;

 function OZTGToken() {
  owner                 = msg.sender;
  assignedSupply = 0;

  // mint all tokens
  totalSupply = MAX_NUM_OZTG_TOKENS;
        balances[msg.sender] = MAX_NUM_OZTG_TOKENS;
        Transfer(address(0x0), msg.sender, MAX_NUM_OZTG_TOKENS);
 }

 function setDefroster(address addr) onlyOwner {
  defroster = addr;
 }

  modifier onlyDefrosterOrOwner() {
        require(msg.sender == defroster || msg.sender == owner);
        _;
    }

 /**
   * @dev Transfer tokens in batches (of adresses)
   * @param _vaddr address The address which you want to send tokens from
   * @param _vamounts address The address which you want to transfer to
   */
  function batchAssignTokens(address[] _vaddr, uint[] _vamounts, uint[] _vDefrostClass )
  
  onlyOwner {

   require ( batchAssignStopped == false );
   require ( _vaddr.length == _vamounts.length && _vaddr.length == _vDefrostClass.length);
   //Looping into input arrays to assign target amount to each given address
   for (uint index=0; index<_vaddr.length; index++) {

    address toAddress = _vaddr[index];
    uint amount = SafeMath.mul(_vamounts[index], 10 ** decimals);
    uint defrostClass = _vDefrostClass[index]; // 0=ico investor, 1=reserveandteam/advisors

    if (  defrostClass == 0 ) {
     // investor account
     transfer(toAddress, amount);
     assignedSupply = SafeMath.add(assignedSupply, amount);
    }
    else if(defrostClass == 1){

     // Iced account. The balance is not affected here
                    vIcedBalances.push(toAddress);
                    icedBalances_frosted[toAddress] = amount;
     icedBalances_defrosted[toAddress] = 0;
     assignedSupply = SafeMath.add(assignedSupply, amount);
    }
   }
 }

 function getBlockTimestamp() constant returns (uint256){
  return now;
 }

 function getAssignedSupply() constant returns (uint256){
  return assignedSupply;
 }

 function elapsedMonthsFromICOStart() constant returns (int elapsed) {
  elapsed = (int(now-START_ICO_TIMESTAMP)/60)/DEFROST_MONTH_IN_MINUTES;
 }

 function getDefrostFactor()constant returns (uint){
  return DEFROST_FACTOR;
 }

 function lagDefrost()constant returns (int){
  return DEFROST_MONTHS;
 }

 function canDefrost() constant returns (bool){
  int numMonths = elapsedMonthsFromICOStart();
  return  numMonths > DEFROST_MONTHS &&
       uint(numMonths) <= SafeMath.add(uint(DEFROST_MONTHS),  DEFROST_FACTOR/2+1);
 }

 function defrostTokens(uint fromIdx, uint toIdx) onlyDefrosterOrOwner {

  require(now>START_ICO_TIMESTAMP);
  require(stopDefrost == false);
  require(fromIdx>=0 && toIdx<=vIcedBalances.length);
  if(fromIdx==0 && toIdx==0){
   fromIdx = 0;
   toIdx = vIcedBalances.length;
  }

  int monthsElapsedFromFirstDefrost = elapsedMonthsFromICOStart() - DEFROST_MONTHS;
  require(monthsElapsedFromFirstDefrost>0);
  uint monthsIndex = uint(monthsElapsedFromFirstDefrost);
  //require(monthsIndex<=DEFROST_FACTOR);
  require(canDefrost() == true);

  /*
   if monthsIndex == 1 => defrost 50%
   else if monthsIndex <= 10  defrost 5%
  */

  // Looping into the iced accounts
        for (uint index = fromIdx; index < toIdx; index++) {

   address currentAddress = vIcedBalances[index];
            uint256 amountTotal = SafeMath.add(icedBalances_frosted[currentAddress], icedBalances_defrosted[currentAddress]);
            uint256 targetDeFrosted = 0;
   uint256 fivePercAmount = SafeMath.div(amountTotal, DEFROST_FACTOR);
   if(monthsIndex==1){
    targetDeFrosted = SafeMath.mul(fivePercAmount, 10);  //  10 times 5% = 50%
   }else{
    targetDeFrosted = SafeMath.mul(fivePercAmount, 10) + SafeMath.div(SafeMath.mul(monthsIndex-1, amountTotal), DEFROST_FACTOR);
   }
            uint256 amountToRelease = SafeMath.sub(targetDeFrosted, icedBalances_defrosted[currentAddress]);

      if (amountToRelease > 0 && targetDeFrosted > 0) {
                icedBalances_frosted[currentAddress] = SafeMath.sub(icedBalances_frosted[currentAddress], amountToRelease);
                icedBalances_defrosted[currentAddress] = SafeMath.add(icedBalances_defrosted[currentAddress], amountToRelease);
    transfer(currentAddress, amountToRelease);
         }
        }
 }

 function getStartIcoTimestamp() constant returns (uint) {
  return START_ICO_TIMESTAMP;
 }

 function stopBatchAssign() onlyOwner {
   require ( batchAssignStopped == false);
   batchAssignStopped = true;
 }

 function getAddressBalance(address addr) constant returns (uint256 balance)  {
   balance = balances[addr];
 }

 function getAddressAndBalance(address addr) constant returns (address _address, uint256 _amount)  {
   _address = addr;
   _amount = balances[addr];
 }

 function setStopDefrost() onlyOwner {
   stopDefrost = true;
 }

 function killContract() onlyOwner {
  selfdestruct(owner);
 }


}
function batchAssignTokens(address[] _vaddr, uint[] _vamounts, uint[] _vDefrostClass )
  
onlyOwner {

 require ( batchAssignStopped == false );
 require ( _vaddr.length == _vamounts.length && _vaddr.length == _vDefrostClass.length);
 //Looping into input arrays to assign target amount to each given address
 for (uint index=0; index<_vaddr.length; index++) {

  address toAddress = _vaddr[index];
  uint amount = SafeMath.mul(_vamounts[index], 10 ** decimals);
  uint defrostClass = _vDefrostClass[index]; // 0=ico investor, 1=reserveandteam/advisors

  if (  defrostClass == 0 ) {
   // investor account
   transfer(toAddress, amount);
   assignedSupply = SafeMath.add(assignedSupply, amount);
  }
  else if(defrostClass == 1){

   // Iced account. The balance is not affected here
                  vIcedBalances.push(toAddress);
                  icedBalances_frosted[toAddress] = amount;
   icedBalances_defrosted[toAddress] = 0;
   assignedSupply = SafeMath.add(assignedSupply, amount);
  }
 }


/**
 * @dev Transfer tokens in batches (of adresses)
 * @param _vaddr address The address which you want to send tokens from
 * @param _vamounts address The address which you want to transfer to
 */