/// <summary>
/// Get Election by unique Election ID
/// </summary>
/// <param name="electionId">Unique Election ID</param>
/// <returns type="ElectionViewModel">Election</returns>
public ElectionViewModel GetElectionById(int electionId)
{
Election toReturn = _electionRepository.GetElection(electionId);
return(ElectionViewModel.ToViewModel(toReturn));
}
/// <summary>
/// Determine winning party, count votes for candidate in area
/// </summary>
/// <param name="electionId">Unique Election Id</param>
/// <returns></returns>
public ResultsViewModel GetElectionResult(int electionId)
{
// get Election to be calculated
Election election = _electionServices.GetElection(electionId);
// get list of votes cast for election
ICollection <Vote> allVotes = _voteRepository.GetVotesWithElectionId(electionId);
// instantialise list of votes that have not been spoilt
ICollection <Vote> unSpoiltVotes = new List <Vote>();
int spoiltNumber = 0;
// if vote has been spoilt, add to count
// else add to list
foreach (var vote in allVotes)
{
if (vote.Candidate != null)
{
unSpoiltVotes.Add(vote);
}
else
{
spoiltNumber = spoiltNumber + 1;
}
}
// group votes by Area
var groupedVotes = unSpoiltVotes.GroupBy(x => x.Candidate.Area);
// get list of all votes
ICollection <Area> areasInElection = groupedVotes.Select(x => x.Key).ToList();
ICollection <AreaResultsViewModel> results = new List <AreaResultsViewModel>();
// calc election result depending on Election Type
switch (election.ElectionType)
{
case ElectionType.FirstPastThePost:
foreach (Area area in areasInElection)
{
if (area != null)
{
results.Add(CalcFirstPastThePostResult(groupedVotes.Where(x => x.Key == area).Single().ToList(), area));
}
}
break;
case ElectionType.Preference:
foreach (Area area in areasInElection)
{
results.Add(CalcPreferenceVoteResult(groupedVotes.Where(x => x.Key == area).Single().ToList()));
}
break;
default:
throw new Exception("Invalid ElectionType for Election in the GetElectionResult method");
}
// empty list of candidates
var winningCandidateList = new List <CandidateViewModel>();
foreach (var area in results)
{
// candidates must have majority of votes
if (area.CandidatesInArea.First().Votes != area.CandidatesInArea.ElementAt(1).Votes)
{
// get first candidate in each area, as they have top votes
winningCandidateList.Add(area.CandidatesInArea.First());
}
}
// group by party(id) and orderby number of winning candidates
var partiesByCandidateCount = winningCandidateList.GroupBy(x => x.PartyId).OrderByDescending(x => x.Count());
List <PartyViewModel> partyList = new List <PartyViewModel>();
// iterate over all the parties and count total number of seats each party has
foreach (var candidate in winningCandidateList)
{
if (partyList.Any(x => x.PartyId == candidate.PartyId))
{
foreach (var item in partyList.Where(w => w.PartyId == candidate.PartyId))
{
item.Seats = item.Seats + 1;
}
}
else
{
candidate.Party.Seats = 1;
partyList.Add(candidate.Party);
}
}
partyList = partyList.OrderByDescending(x => x.Seats).ToList();
PartyViewModel party = new PartyViewModel();
// check if there's more than 1 party
if (partiesByCandidateCount.Count() > 1)
{
// if the top 2 parties have the same number of seats
if (partiesByCandidateCount.First().Count() == partiesByCandidateCount.ElementAt(1).Count())
{
// if 1st n 2nd have same number of votes, then there's no majority
party = new PartyViewModel
{
PartyName = "No majority!"
};
}
else
{
// get winning party
party = partyList.FirstOrDefault();
}
}
else if (partiesByCandidateCount.Count() == 0)
{
// if there's no majority in each area, then there's no goverment
party = new PartyViewModel
{
PartyName = "No majority!"
};
}
else
{
// get winning party
party = partyList.FirstOrDefault();
}
var toReturn = new ResultsViewModel()
{
Areas = results,
SpoiltVoteCount = spoiltNumber,
LeadingParty = party,
Parties = partyList
};
return(toReturn);
}
