Ballot.sol

pragma solidity ^0.4.0;

contract Ballot {
    struct Voter {
        uint weight;
        bool voted;
        uint8 vote;
    }
    struct Proposal{
        uint voteCount;
    }
    
    enum Stage{Init,Reg,Vote,Done}
   
   Stage public stage = Stage.Init;
   
   address chairperson;
   mapping(address => Voter) voters;
   
   Proposal[] proposals;
   
   uint startTime;
  
  function Ballot(uint8 _numProposals) public{
      chairperson = msg.sender;
      voters[chairperson].weight = 2;
      proposals.length=_numProposals;
      stage = Stage.Reg;
      startTime = now;
  }
  
  
  //Give voter the Right to vote 
  //Can be given only by the chairperson
  function register ( address toVoter){
      if(stage != Stage.Reg) return;
      if(msg.sender != chairperson||voters[toVoter].voted) return;
      voters[toVoter].weight=1;
      voters[toVoter].voted = false;
      if(now > (startTime + 10 seconds)) {
          stage = Stage.Vote;
          startTime = now;
      }
  }
  
  function vote(uint8 toProposal) public {
      if(stage != Stage.Vote) return;
      Voter storage sender = voters[msg.sender];
      if(sender.voted || toProposal >= proposals.length) return;
      sender.voted = true;
      sender.vote = toProposal;
      proposals[toProposal].voteCount+=sender.weight;
      if(now > (startTime + 10 seconds)) {stage = Stage.Done;}
      
  }
  
  function winningProposal() public constant returns(uint8 _winningProposal){
     if(stage != Stage.Done){return;}
     uint256 winningVoteCount =0;
     for(uint8 prop =0;prop<proposals.length;prop++)
     {
         if(proposals[prop].voteCount>winningVoteCount){
             winningVoteCount=proposals[prop].voteCount;
             _winningProposal = prop;
         }
     }
      
  }
  
}

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