// Vulnerability label: clean
pragma solidity ^0.4.24;

library SafeMath {
    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;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a / b;
        return c;
    }
    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) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

contract Ownable {
    address public owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    
    constructor() public {
        owner = msg.sender;
    }
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }
    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0));
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }

}

contract Pausable is Ownable {
    event Pause();
    event Unpause();

    bool public paused = false;

    modifier whenNotPaused() {
        require(!paused);
        _;
    }

    modifier whenPaused() {
        require(paused);
        _;
    }

    function pause() onlyOwner whenNotPaused public {
        paused = true;
        emit Pause();
    }

    function unpause() onlyOwner whenPaused public {
        paused = false;
        emit Unpause();
    }
}

contract ERC20 {
    function balanceOf(address who) public view returns (uint256);
    function allowance(address owner, address spender) public view returns (uint256);
    function transfer(address to, uint256 value) public returns (bool);
    function approve(address spender, uint256 value) public returns (bool);
    function transferFrom(address from, address to, uint256 value) public returns (bool);

    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);
}

contract Token is ERC20, Pausable {

    struct sUserInfo {
        uint256 balance;
        bool lock;
        mapping(address => uint256) allowed;
    }
    
    using SafeMath for uint256;

    string public name;
    string public symbol;
    uint256 public decimals;
    uint256 public totalSupply;

    bool public restoreFinished = false;

    mapping(address => sUserInfo) user;

    event Mint(uint256 value);
    event Burn(uint256 value);
    event RestoreFinished();
    
    modifier canRestore() {
        require(!restoreFinished);
        _;
    }
    
    function () external payable {
        revert();
    }
    
    function validTransfer(address _from, address _to, uint256 _value, bool _lockCheck) internal {
        require(_to != address(this));
        require(_to != address(0));
        require(user[_from].balance >= _value);
        if(_lockCheck) {
            require(user[_from].lock == false);
        }
    }

    function lock(address _owner) public onlyOwner returns (bool) {
        require(user[_owner].lock == false);
        user[_owner].lock = true;
        return true;
    }
    function unlock(address _owner) public onlyOwner returns (bool) {
        require(user[_owner].lock == true);
        user[_owner].lock = false;
       return true;
    }
 
    function burn(address _to, uint256 _value) public onlyOwner returns (bool) {
        require(_value <= user[_to].balance);
        user[_to].balance = user[_to].balance.sub(_value);
        totalSupply = totalSupply.sub(_value);
        emit Burn(_value);
        return true;
    }
   
    function distribute(address _to, uint256 _value) public onlyOwner returns (bool) {
        validTransfer(msg.sender, _to, _value, false);
       
        user[msg.sender].balance = user[msg.sender].balance.sub(_value);
        user[_to].balance = user[_to].balance.add(_value);
       
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    function approve(address _spender, uint256 _value) public whenNotPaused returns (bool) {
        require(_value > 0);
        user[msg.sender].allowed[_spender] = _value; 
        emit Approval(msg.sender, _spender, _value);
        return true;
    }
    function transferFrom(address _from, address _to, uint256 _value) public whenNotPaused returns (bool) {
        validTransfer(_from, _to, _value, true);
        require(_value <=  user[_from].allowed[msg.sender]);

        user[_from].balance = user[_from].balance.sub(_value);
        user[_to].balance = user[_to].balance.add(_value);

        user[_from].allowed[msg.sender] = user[_from].allowed[msg.sender].sub(_value);
        emit Transfer(_from, _to, _value);
        return true;
    }
    
    function transfer(address _to, uint256 _value) public whenNotPaused returns (bool) {
        validTransfer(msg.sender, _to, _value, true);

        user[msg.sender].balance = user[msg.sender].balance.sub(_value);
        user[_to].balance = user[_to].balance.add(_value);

        emit Transfer(msg.sender, _to, _value);
        return true;
    }
    
    function transferRestore(address _from, address _to, uint256 _value) public onlyOwner canRestore returns (bool) {
        validTransfer(_from, _to, _value, false);
       
        user[_from].balance = user[_from].balance.sub(_value);
        user[_to].balance = user[_to].balance.add(_value);
       
        emit Transfer(_from, _to, _value);
        return true;
    }
    
    function finishRestore() public onlyOwner returns (bool) {
        restoreFinished = true;
        emit RestoreFinished();
        return true;
    }
    
    
    function balanceOf(address _owner) public view returns (uint256) {
        return user[_owner].balance;
    }
    function lockState(address _owner) public view returns (bool) {
        return user[_owner].lock;
    }
    function allowance(address _owner, address _spender) public view returns (uint256) {
        return user[_owner].allowed[_spender];
    }
    
}

contract LockBalance is Ownable {
    
    enum eLockType {None, Individual, GroupA, GroupB, GroupC, GroupD, GroupE, GroupF, GroupG, GroupH, GroupI, GroupJ}
    struct sGroupLockDate {
        uint256[] lockTime;
        uint256[] lockPercent;
    }
    struct sLockInfo {
        uint256[] lockType;
        uint256[] lockBalanceStandard;
        uint256[] startTime;
        uint256[] endTime;
    }
    
    using SafeMath for uint256;

    mapping(uint => sGroupLockDate) groupLockDate;
    
    mapping(address => sLockInfo) lockUser;

    event Lock(address indexed from, uint256 value, uint256 endTime);
    
    function setLockUser(address _to, eLockType _lockType, uint256 _value, uint256 _endTime) internal {
        lockUser[_to].lockType.push(uint256(_lockType));
        lockUser[_to].lockBalanceStandard.push(_value);
        lockUser[_to].startTime.push(now);
        lockUser[_to].endTime.push(_endTime);

        emit Lock(_to, _value, _endTime);
    }

    function lockBalanceGroup(address _owner, uint _index) internal view returns (uint256) {
        uint256 percent = 0;
        uint256 key = uint256(lockUser[_owner].lockType[_index]);

        uint256 time = 99999999999;
        for(uint256 i = 0 ; i < groupLockDate[key].lockTime.length; i++) {
            if(now < groupLockDate[key].lockTime[i]) {
                if(groupLockDate[key].lockTime[i] < time) {
                    time = groupLockDate[key].lockTime[i];
                    percent = groupLockDate[key].lockPercent[i];    
                }
            }
        }
        
        if(percent == 0){
            return 0;
        } else {
            return lockUser[_owner].lockBalanceStandard[_index].mul(uint256(percent)).div(100);
        }
    }

    function lockBalanceIndividual(address _owner, uint _index) internal view returns (uint256) {
        if(now < lockUser[_owner].endTime[_index]) {
            return lockUser[_owner].lockBalanceStandard[_index];
        } else {
            return 0;
        }
    }
    
    function clearLockUser(address _owner, uint _index) onlyOwner public {
        require(lockUser[_owner].endTime.length >_index);
        lockUser[_owner].endTime[_index] = 0;
    }
        
    function addLockDate(eLockType _lockType, uint256 _second, uint256 _percent) onlyOwner public {
        require(_percent > 0 && _percent <= 100);
        sGroupLockDate storage lockInfo = groupLockDate[uint256(_lockType)];
        bool isExists = false;
        for(uint256 i = 0; i < lockInfo.lockTime.length; i++) {
            if(lockInfo.lockTime[i] == _second) {
                revert();
                break;
            }
        }
        
        if(isExists) {
           revert();
        } else {
            lockInfo.lockTime.push(_second);
            lockInfo.lockPercent.push(_percent);
        }
    }
    
    function deleteLockDate(eLockType _lockType, uint256 _lockTime) onlyOwner public {
        sGroupLockDate storage lockDate = groupLockDate[uint256(_lockType)];
        
        bool isExists = false;
        uint256 index = 0;
        for(uint256 i = 0; i < lockDate.lockTime.length; i++) {
            if(lockDate.lockTime[i] == _lockTime) {
                isExists = true;
                index = i;
                break;
            }
        }
        
        if(isExists) {
            for(uint256 k = index; k < lockDate.lockTime.length - 1; k++){
                lockDate.lockTime[k] = lockDate.lockTime[k + 1];
                lockDate.lockPercent[k] = lockDate.lockPercent[k + 1];
            }
            delete lockDate.lockTime[lockDate.lockTime.length - 1];
            lockDate.lockTime.length--;
            delete lockDate.lockPercent[lockDate.lockPercent.length - 1];
            lockDate.lockPercent.length--;
        } else {
            revert();
        }
        
    }


    function lockTypeInfoGroup(eLockType _type) public view returns (uint256[] memory , uint256[] memory ) {
        uint256 key = uint256(_type);
        return (groupLockDate[key].lockTime, groupLockDate[key].lockPercent);
    }
    function lockUserInfo(address _owner) public view returns (uint256[] memory , uint256[] memory , uint256[] memory , uint256[] memory , uint256[] memory ) {
        
        uint256[] memory balance = new uint256[](lockUser[_owner].lockType.length);
        for(uint256 i = 0; i < lockUser[_owner].lockType.length; i++){
            if(lockUser[_owner].lockType[i] == uint256(eLockType.Individual)) {
                balance[i] = balance[i].add(lockBalanceIndividual(_owner, i));
            } else if(lockUser[_owner].lockType[i] != uint256(eLockType.None)) {
                balance[i] = balance[i].add(lockBalanceGroup(_owner, i));
            }
        }
        
        return (lockUser[_owner].lockType,
        lockUser[_owner].lockBalanceStandard,
        balance,
        lockUser[_owner].startTime,
        lockUser[_owner].endTime);
    }
    function lockBalanceAll(address _owner) public view returns (uint256) {
        uint256 lockBalance = 0;
        for(uint256 i = 0; i < lockUser[_owner].lockType.length; i++){
            if(lockUser[_owner].lockType[i] == uint256(eLockType.Individual)) {
                lockBalance = lockBalance.add(lockBalanceIndividual(_owner, i));
            } else if(lockUser[_owner].lockType[i] != uint256(eLockType.None)) {
                lockBalance = lockBalance.add(lockBalanceGroup(_owner, i));
            }
        }
        return lockBalance;
    }
    
}

contract VARCcoin is Token, LockBalance {

    constructor() public {
        name = "VARC";
        symbol = "VARC";
        decimals = 18;
        uint256 initialSupply = 2500000000;
        totalSupply = initialSupply * 10 ** uint(decimals);
        user[owner].balance = totalSupply;
        emit Transfer(address(0), owner, totalSupply);
    }

    function validTransfer(address _from, address _to, uint256 _value, bool _lockCheck) internal {
        super.validTransfer(_from, _to, _value, _lockCheck);
        if(_lockCheck) {
            require(_value <= useBalanceOf(_from));
        }
    }

    function setLockUsers(eLockType _type, address[] memory _to, uint256[] memory _value, uint256[] memory  _endTime) onlyOwner public {  
        require(_to.length > 0);
        require(_to.length == _value.length);
        require(_to.length == _endTime.length);
        require(_type != eLockType.None);
        
        for(uint256 i = 0; i < _to.length; i++){
            require(_value[i] <= useBalanceOf(_to[i]));
            setLockUser(_to[i], _type, _value[i], _endTime[i]);
        }
    }
    
    function useBalanceOf(address _owner) public view returns (uint256) {
        return balanceOf(_owner).sub(lockBalanceAll(_owner));
    }
    
}