Election.sol

pragma solidity ^0.4.2;

contract Election {
	//Model candidate
	struct Candidate {
		uint id;
		string name;
		uint voteCount;
	}
	//Store accounts that voted
	mapping(address => bool) public voters;
	//Store candidates
	mapping(uint => Candidate) public candidates; //Key Value pair
	//Fetch candidates
	//Store candidate count
	uint public candidatesCount;

	//Voted event
	event votedEvent (uint indexed _candidateId);

	function Election() public {
		addCandidate("Friends");
		addCandidate("How I Met Your Mother");
	}

	function addCandidate (string _name) private {
		candidatesCount++;
		candidates[candidatesCount] = Candidate(candidatesCount, _name, 0);
	}

	function vote (uint _candidateId) public {
		//Require that they haven't voted before
		require(!voters[msg.sender]);
		//Require a valid candidate
		require(_candidateId > 0 && _candidateId <= candidatesCount);
		//Record voter has voted
		voters[msg.sender] = true;
		//Update candidate vote count
		candidates[_candidateId].voteCount++;
		//Trigger voted event
		votedEvent(_candidateId);
	}
}