Backend-Voting-System/VotingSystem.sol at master · oscarhjelde/Backend-Voting-System · GitHub

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pragma solidity ^0.4.20;

contract VotingSystem {

    // This sctructure holds info about the person who votes
    struct Voter {
        bool voted;
        uint8 vote;
    }

    // This sctructure holds info about the person who you can vote for
    struct Candidate {
        bytes32 name;
        uint8 numberOfVotes;
    }

    // Contract owner's address
    address contractOwner;


    // Mapping adresse's to voter info
    mapping(address => Voter) voters;
    Candidate[] candidates;
    mapping(string => Candidate) results;

    // Our constructor assigns names of candidates to the Candidate
    // array we stor on block chain.
    // Also stors the contractOwner address on the block chain
    function VotingSystem (bytes32[] candidateNames) {
        contractOwner = msg.sender;

        for (uint8 i = 0; i < candidateNames.length; i++) {
            candidates.push(Candidate({
                name : candidateNames[i],
                numberOfVotes : 0
            }));
        }

    }

    // Voting function:
    // Check wheter the voter has voted, if not:
    // Mark the fact that he voted, also store the person he voted for
    // Finally increment candidate's numberOfVotes
    function vote (uint8 voteFor) {
        Voter storage sender = voters[msg.sender];

        if(sender.voted) return;

        sender.voted = true;
        sender.vote = voteFor;

        candidates[voteFor].numberOfVotes += 1;
    }


    // This function returns the candidate with most votes.
    function winningCandidate () constant returns(uint8 winnerName) {

        uint8 tempWinnerName;
        uint maxVote = 0;

        for (uint8 i = 0; i < candidates.length; i++) {

            if (candidates[i].numberOfVotes > maxVote) {

                maxVote = candidates[i].numberOfVotes;
                tempWinnerName = i;

            }

        }

        return tempWinnerName;


    }


}