private void FinishAddingRecord(string primaryId, string value, FeaturedRecLists recs, FeaturedRecCondition c)
{
//NOTE: This assumes one product field with a comma separated list for includes
// and a second for excludes for each product
// includes will be ranked in order of how they are listed
var newRecs = value.Split(',').Select(p => p.Trim())
.Where(r => !string.IsNullOrEmpty(r) && !r.Equals("-1")).ToList();
if (!newRecs.Any()) return;
foreach (var r in newRecs)
{
if (c.Include) //items are recommended
{
if (recs.Blocked.Count > 0 && recs.Blocked.Any(x => x.Equals(r))) //remove from blocked list
Records[primaryId].Blocked.Remove(r);
if (recs.Recommended.Count > 0 && recs.Recommended.Any(x => x.Equals(r))) continue; //already in the recommended list
Records[primaryId].Recommended.Add(r);
}
else //items are blocked
{
if (recs.Recommended.Count > 0 && recs.Recommended.Any(x => x.Equals(r))) //remove from recommended list
Records[primaryId].Recommended.Remove(r);
if (recs.Blocked.Count > 0 && recs.Blocked.Any(x => x.Equals(r))) continue; //already in the blocked list
Records[primaryId].Blocked.Add(r);
}
}
}
public FeaturedRecommendations(List<string[]> data)
{
if (data == null) return;
//get column order (data[0] holds the column headers) and determine whether the file has ranking or likelihood columns
var columnNames = new string[] { "ProductId", "RecId", "Ranking", "Likelihood" };
var headerPositions = new int[columnNames.Length];
var headerRow = data[0];
data.RemoveAt(0);
for (var i = 0; i < columnNames.Length; i++)
{
var found = false;
for (var j = 0; j < headerRow.Length; j++)
{
if (!headerRow[j].Equals(columnNames[i], StringComparison.OrdinalIgnoreCase))
continue;
headerPositions[i] = j;
found = true;
break;
}
if (!found)
{
if (i > 1) //ranking and Likelihood columns are optional
headerPositions[i] = -1;
else
throw new Exception(string.Format("Cannot read Featured Recs. Missing column {0}", columnNames[i]));
}
}
var convertLikelihood = headerPositions[2] == -1 && headerPositions[3] > -1; //Ranking is missing and Likelihood exists
//first parse the rows into an initial dictionary that preserves any rankings from the file
var firstPass = new Dictionary<string, List<GeneratorFeaturedRec>>();
foreach (var row in data)
{
var rec = new GeneratorFeaturedRec
{
PrimaryId = row[headerPositions[0]],
RecommendedId = row[headerPositions[1]]
};
if (convertLikelihood)
{
var likelihood = Input.SafeFloatConvert(row[headerPositions[3]]);
rec.Ranking = likelihood <= 0F ? 0 : (int)Math.Floor(100 * (1.0 - likelihood) + .001);
}
else if (headerPositions[2] >= 0)
rec.Ranking = Input.SafeIntConvert(row[headerPositions[2]]);
else
rec.Ranking = -1; //set it below instead
List<GeneratorFeaturedRec> existing;
if (firstPass.TryGetValue(rec.PrimaryId, out existing))
{
if (rec.Ranking == -1) rec.Ranking = existing.Select(x => x.Ranking).Max() + 1;
firstPass[rec.PrimaryId].Add(rec);
}
else
{
if (rec.Ranking == -1) rec.Ranking = 1;
firstPass.Add(rec.PrimaryId, new List<GeneratorFeaturedRec> { rec });
}
}
//now cleanup rankings and convert to ManualRec format
Records = new Dictionary<string, FeaturedRecLists>();
foreach (var f in firstPass)
{
var rec = new FeaturedRecLists();
var blocked = f.Value.Where(x => x.Ranking.Equals(0));
if (blocked.Any())
rec.Blocked.AddRange(blocked.Select(x => x.RecommendedId));
var recommended = f.Value.Where(x => x.Ranking > 0).ToList();
if (recommended.Any())
{
recommended.Sort(); //sorts by ranking
rec.Recommended.AddRange(recommended.Select(x => x.RecommendedId));
}
Records.Add(f.Key, rec);
}
}
public void AddRecords(string primaryId, XElement product, List<FeaturedRecCondition> conditions)
{
if (conditions == null || !conditions.Any()) return;
//each condition defines all recs for a given primary id
FeaturedRecLists recs;
if (!Records.TryGetValue(primaryId, out recs))
{
recs = new FeaturedRecLists();
Records.Add(primaryId, recs);
}
//note: there could be a second condition for the same id if one is for excludes
foreach (var c in conditions)
{
var value = Input.GetValue(product, c.ResultField);
if (string.IsNullOrEmpty(value)) continue;
FinishAddingRecord(primaryId, value, recs, c);
}
}
