private static (int ix1, int ix2, int[] ranked) attemptRanking(RankRanking ranking, RankSet set)
{
var ix1 = -1;
var ix2 = -1;
var indexesToRank = Enumerable.Range(0, set.Items.Length).Except(ranking.Ignore).ToArray();
var ranked = indexesToRank.OrderBy((i1, i2) =>
{
if (i1 == i2)
{
return(0);
}
if (ranking.Comparisons.Contains(new RankComparison(i1, i2)))
{
return(1);
}
if (ranking.Comparisons.Contains(new RankComparison(i2, i1)))
{
return(-1);
}
if (ix1 == -1)
{
ix1 = i1;
ix2 = i2;
}
return(0);
}).ToArray();
return(ix1, ix2, ranked);
}
private HttpResponse processPost(HttpRequest req)
{
switch (req.Post["fnc"].Value)
{
case "create":
var items = req.Post["items"].Value.Replace("\r", "").Trim().Split('\n').Select(line => line.Trim()).ToArray();
var hash = MD5.Create().ComputeHash(items.JoinString("\n").ToUtf8()).ToHex();
var newSet = new RankSet {
Hash = hash, Items = items, Name = req.Post["title"].Value
};
if (!_setsDic.ContainsKey(hash))
{
lock (this)
if (!_setsDic.ContainsKey(hash))
{
var newSetSlim = newSet.ToSlim();
_setsDic[hash] = newSetSlim;
_setsList.Add(newSetSlim);
ClassifyJson.SerializeToFile(newSet, setPath(hash));
}
}
return(HttpResponse.Redirect(req.Url.WithQuery("set", hash)));
case "start":
lock (this)
{
var currentSetHash = req.Post["set"].Value;
var setFilePath = setPath(currentSetHash);
if (!File.Exists(setFilePath))
{
return(HttpResponse.PlainText("That set does not exist.", HttpStatusCode._404_NotFound));
}
var currentSet = ClassifyJson.DeserializeFile <RankSet>(setFilePath);
retry:
var publicToken = Rnd.GenerateString(32);
var privateToken = Rnd.GenerateString(32);
var path = rankingPath(publicToken);
if (File.Exists(path) || currentSet.DicRankings.ContainsKey(publicToken))
{
goto retry;
}
var newRanking = new RankRanking {
Finished = false, PublicToken = publicToken, PrivateToken = privateToken, SetHash = currentSetHash, Title = req.Post["title"].Value, Question = req.Post["question"].Value
};
var newRankingSlim = newRanking.ToSlim();
currentSet.DicRankings[publicToken] = newRankingSlim;
currentSet.ListRankings.Add(newRankingSlim);
ClassifyJson.SerializeToFile(newRanking, path);
ClassifyJson.SerializeToFile(currentSet, setFilePath);
return(HttpResponse.Redirect(req.Url.WithoutQuery().WithQuery("ranking", publicToken).WithQuery("secret", privateToken)));
}
case "rank":
lock (this)
{
var publicToken = req.Post["ranking"].Value;
var privateToken = req.Post["secret"].Value;
var rankingFilePath = rankingPath(publicToken);
if (!File.Exists(rankingFilePath))
{
return(HttpResponse.PlainText("That ranking does not exist.", HttpStatusCode._404_NotFound));
}
var currentRanking = ClassifyJson.DeserializeFile <RankRanking>(rankingFilePath);
if (privateToken != currentRanking.PrivateToken)
{
return(HttpResponse.PlainText("You cannot vote in this ranking.", HttpStatusCode._404_NotFound));
}
var setFilePath = setPath(currentRanking.SetHash);
if (!File.Exists(setFilePath))
{
return(HttpResponse.PlainText("That set does not exist.", HttpStatusCode._404_NotFound));
}
var currentSet = ClassifyJson.DeserializeFile <RankSet>(setFilePath);
if (!int.TryParse(req.Post["ix1"].Value, out var ix1) || !int.TryParse(req.Post["ix2"].Value, out var ix2) || !int.TryParse(req.Post["more"].Value, out var more) || (more != ix1 && more != ix2))
{
return(HttpResponse.PlainText("Invalid integers.", HttpStatusCode._404_NotFound));
}
var newComparison = new RankComparison(more == ix1 ? ix2 : ix1, more == ix1 ? ix1 : ix2);
// Transitive closure
var ancestorLesses = currentRanking.Comparisons.Where(c => c.More == newComparison.Less).Select(c => c.Less).ToList();
ancestorLesses.Add(newComparison.Less);
var descendantMores = currentRanking.Comparisons.Where(c => c.Less == newComparison.More).Select(c => c.More).ToList();
descendantMores.Add(newComparison.More);
for (int i = 0; i < ancestorLesses.Count; i++)
{
for (int j = 0; j < descendantMores.Count; j++)
{
currentRanking.Comparisons.Add(new RankComparison(ancestorLesses[i], descendantMores[j]));
}
}
var result = attemptRanking(currentRanking, currentSet);
if (result.ix1 == -1)
{
currentRanking.Finished = true;
// This relies on reference equality, i.e. that currentSet.ListRankings contains the same object
currentSet.DicRankings[publicToken].Finished = true;
ClassifyJson.SerializeToFile(currentSet, setFilePath);
}
ClassifyJson.SerializeToFile(currentRanking, rankingFilePath);
return(HttpResponse.Redirect(req.Url.WithoutQuery().WithQuery("ranking", publicToken).WithQuery("secret", privateToken)));
}
}
return(HttpResponse.PlainText("What?", HttpStatusCode._500_InternalServerError));
}