pragma solidity ^0.4.18;
 
/* 
    PIONEER SOCIAL is Registered in United Kingdom. 
    Pioneer Classic is first social coin who have big Social Media Platform 
    where you upload videos and Create community, groups, pages, and earn handsome income.
 */
contract ERC20Basic {
  uint256 public totalSupply;
  function balanceOf(address who) constant returns (uint256);
  function transfer(address to, uint256 value) returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}
 
/*
   ERC20 interface
  see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) constant returns (uint256);
  function transferFrom(address from, address to, uint256 value) returns (bool);
  function approve(address spender, uint256 value) returns (bool);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}
 
/*  SafeMath - the lowest gas library
  Math operations with safety checks that throw on error
 */
library SafeMath {
    
  function mul(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }
 
  function div(uint256 a, uint256 b) internal constant 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;
  }
 
  function sub(uint256 a, uint256 b) internal constant returns (uint256) {
    assert(b <= a);
    return a - b;
  }
 
  function add(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
  
}
 
/*
Basic token
 Basic version of StandardToken, with no allowances. 
 */
contract BasicToken is ERC20Basic {
    
  using SafeMath for uint256;
 
  mapping(address => uint256) balances;
 
 function transfer(address _to, uint256 _value) returns (bool) {
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }
 
  /*
  Gets the balance of the specified address.
   param _owner The address to query the the balance of. 
   return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) constant returns (uint256 balance) {
    return balances[_owner];
  }
 
}
 
/* Implementation of the basic standard token.
  https://github.com/ethereum/EIPs/issues/20
 */
contract StandardToken is ERC20, BasicToken {
 
  mapping (address => mapping (address => uint256)) allowed;
 
  /*
    Transfer tokens from one address to another
    param _from address The address which you want to send tokens from
    param _to address The address which you want to transfer to
    param _value uint256 the amout of tokens to be transfered
   */
  function transferFrom(address _from, address _to, uint256 _value) returns (bool) {
    var _allowance = allowed[_from][msg.sender];
 
    // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
    // require (_value <= _allowance);
 
    balances[_to] = balances[_to].add(_value);
    balances[_from] = balances[_from].sub(_value);
    allowed[_from][msg.sender] = _allowance.sub(_value);
    Transfer(_from, _to, _value);
    return true;
  }
 
  /*
  Aprove the passed address to spend the specified amount of tokens on behalf of msg.sender.
   param _spender The address which will spend the funds.
   param _value The amount of Roman Lanskoj's tokens to be spent.
   */
  function approve(address _spender, uint256 _value) returns (bool) {
 
    // To change the approve amount you first have to reduce the addresses`
    //  allowance to zero by calling `approve(_spender, 0)` if it is not
    //  already 0 to mitigate the race condition described here:
    //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
    require((_value == 0) || (allowed[msg.sender][_spender] == 0));
 
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }
 
  /*
  Function to check the amount of tokens that an owner allowed to a spender.
  param _owner address The address which owns the funds.
  param _spender address The address which will spend the funds.
  return A uint256 specifing the amount of tokens still available for the spender.
   */
  function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
    return allowed[_owner][_spender];
}
}
 
/*
The Ownable contract has an owner address, and provides basic authorization control
 functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    
  address public owner;
 
 
  function Ownable() {
    owner = msg.sender;
  }
 
  /*
  Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }
 
  /*
  Allows the current owner to transfer control of the contract to a newOwner.
  param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) onlyOwner {
    require(newOwner != address(0));      
    owner = newOwner;
  }
 
}
 
contract TheLiquidToken is StandardToken, Ownable {
    // mint can be finished and token become fixed for forever
  event Mint(address indexed to, uint256 amount);
  event MintFinished();
  bool mintingFinished = false;
  modifier canMint() {
    require(!mintingFinished);
    _;
  }
 
 function mint(address _to, uint256 _amount) onlyOwner canMint returns (bool) {
    totalSupply = totalSupply.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    Mint(_to, _amount);
    return true;
  }
 
  /*
  Function to stop minting new tokens.
  return True if the operation was successful.
   */
  
  function burn(uint _value)
        public
    {
        require(_value > 0);

        address burner = msg.sender;
        balances[burner] = balances[burner].sub(_value);
        totalSupply = totalSupply.sub(_value);
        Burn(burner, _value);
    }

    event Burn(address indexed burner, uint indexed value);
}

contract PIONEER is TheLiquidToken {
  string public constant name = "PIONEER COIN CLASSIC";
  string public constant symbol = "PCC";
  uint public constant decimals = 8;
  uint256 public initialSupply;
    
  function PIONEER () { 
     totalSupply = 15000000 * 10 ** decimals;
      balances[msg.sender] = totalSupply;
      initialSupply = totalSupply; 
        Transfer(0, this, totalSupply);
        Transfer(this, msg.sender, totalSupply);
  }
}

contract Crowdsale is PIONEER {
    
    using SafeMath for uint;
    
    address multisig;
 
    uint restrictedPercent;
 
    address restricted;
 
    PIONEER public token = new PIONEER();
 
    uint start;
    
    uint period;
 
    uint hardcap;
 
    uint rate;
 
    function Crowdsale() {
	multisig = 0x0C12c4a7A690663813612924377262b7A957Eb23;
	restricted = 0x0C12c4a7A690663813612924377262b7A957Eb23;
	restrictedPercent = 50;
	rate = 550 * (10 ** 8);
	start = 1508743500; //23rd October 2017 07:25:00 AM (UTC)

	period = 28;
        hardcap = 100000 * (10 ** 18);
    }
 
    modifier saleIsOn() {
    	require(now > start && now < start + period * 1 days);
    	_;
    }
	
    modifier isUnderHardCap() {
        require(multisig.balance <= hardcap);
        _;
    }
 
    function finishMinting() public onlyOwner {
	uint issuedTokenSupply = token.totalSupply();
	uint restrictedTokens = issuedTokenSupply.mul(restrictedPercent).div(100 - restrictedPercent);
	token.mint(restricted, restrictedTokens);
    }
 
   function createTokens() isUnderHardCap saleIsOn payable {
     multisig.transfer(msg.value);
        uint tokens = rate.mul(msg.value).div(1 ether);
        uint bonusTokens = 0;
        if(now < (start + 1 days)) {
          bonusTokens = 200;
        } else if(now < (start + 1 days) + (period * 1 days).div(4)) {
          bonusTokens = 150;
        } else if(now >= (start + 1 days) + (period * 1 days).div(4) && now < (start + 1 days) + (period * 1 days).div(4).mul(2)) {
          bonusTokens = 100;
        } else if(now >= (start + 1 days) + (period * 1 days).div(4).mul(2) && now < (start + 1 days) + (period * 1 days).div(4).mul(3)) {
          bonusTokens = 50;
        }
        tokens += bonusTokens;
        token.mint(msg.sender, tokens);
    }
  
 
    function() external payable {
        createTokens();
    }
    
}