feat: import leftover student fields into notes and show them on the roster

Store leftover CSV columns on hidden student notes, move catalog import to /events/import, and persist Students index columns from Chapter Settings.

Co-authored-by: Cursor <cursoragent@cursor.com>

Core/Parsers/StudentNotesFieldParser.cs

@@ -0,0 +1,164 @@
+using Core.Entities;
+using Core.Models;
+using Core.Notes;
+
+namespace Core.Parsers;
+
+/// <summary>
+/// Parses leftover CSV columns (not roster or ranking) into student note field merges.
+/// </summary>
+public class StudentNotesFieldParser : CsvParserBase
+{
+    private static readonly HashSet<string> ReservedHeaders = new(StringComparer.OrdinalIgnoreCase)
+    {
+        "Student Name",
+        "Grade",
+        "TSA year",
+        "State ID",
+        "Regional ID",
+        "National ID",
+        "Officer",
+        "TOTAL # OF EVENTS"
+    };
+
+    public StudentNotesFieldParser(FileSystemInfo csvFile, bool ignoreBlankLines = true) : base(csvFile, ignoreBlankLines)
+    {
+    }
+
+    public StudentNotesFieldParser(StreamReader reader, bool ignoreBlankLines = true) : base(reader, ignoreBlankLines)
+    {
+    }
+
+    /// <summary>
+    /// Roster and ranking columns that must not become imported note fields.
+    /// </summary>
+    public static bool IsReservedHeader(string? header)
+    {
+        if (string.IsNullOrWhiteSpace(header))
+            return true;
+
+        var trimmed = header.Trim();
+        if (ReservedHeaders.Contains(trimmed))
+            return true;
+
+        return int.TryParse(trimmed, out var rank)
+               && rank >= 1
+               && rank <= StudentEventRanking.MaxRank;
+    }
+
+    /// <summary>
+    /// Leftover field names from a header row after reserved columns are removed.
+    /// </summary>
+    public static List<string> GetLeftoverFieldNames(IEnumerable<string?> headers) =>
+        headers
+            .Where(h => !IsReservedHeader(h))
+            .Select(h => h!.Trim())
+            .ToList();
+
+    /// <summary>
+    /// Reads the header row and returns leftover field names without processing data rows.
+    /// </summary>
+    public List<string> PeekLeftoverFieldNames()
+    {
+        CsvReader.Read();
+        CsvReader.ReadHeader();
+        return GetLeftoverFieldNames(CsvReader.HeaderRecord ?? []);
+    }
+
+    public StudentNotesImportResult Parse(
+        ICollection<Student> students,
+        IReadOnlyDictionary<int, string?> existingNotesByStudentId)
+    {
+        var result = new StudentNotesImportResult();
+
+        CsvReader.Read();
+        CsvReader.ReadHeader();
+
+        if (CsvReader.HeaderRecord is null ||
+            !CsvReader.HeaderRecord.Contains("Student Name", StringComparer.OrdinalIgnoreCase))
+        {
+            result.Errors.Add("CSV must include a 'Student Name' column.");
+            return result;
+        }
+
+        var fieldNames = GetLeftoverFieldNames(CsvReader.HeaderRecord);
+        result.FieldNames = fieldNames;
+
+        if (fieldNames.Count == 0)
+            result.Warnings.Add("No leftover field columns were found besides roster and ranking columns.");
+
+        Dictionary<int, PendingStudentFields> pendingByStudentId = [];
+
+        while (CsvReader.Read())
+        {
+            var rowNumber = CsvReader.Context.Parser?.Row ?? 0;
+            var name = CsvReader.GetField("Student Name")?.Trim();
+            if (string.IsNullOrEmpty(name))
+                continue;
+
+            var studentMatch = FuzzyStudentMatcher.Find(students, name);
+            if (studentMatch is null)
+            {
+                result.Issues.Add(new StudentNotesImportIssue
+                {
+                    RowNumber = rowNumber,
+                    RawStudentName = name,
+                    Message = $"No student matched '{name}'."
+                });
+                continue;
+            }
+
+            var (student, score) = studentMatch.Value;
+            if (!pendingByStudentId.TryGetValue(student.Id, out var pending))
+            {
+                pending = new PendingStudentFields(student);
+                pendingByStudentId[student.Id] = pending;
+            }
+
+            pending.RawStudentName = name;
+            pending.RowNumber = rowNumber;
+            pending.StudentScore = score;
+
+            foreach (var fieldName in fieldNames)
+            {
+                var raw = CsvReader.GetField(fieldName);
+                pending.Fields[fieldName.Trim()] = raw ?? string.Empty;
+            }
+        }
+
+        foreach (var pending in pendingByStudentId.Values)
+        {
+            List<ImportedField> incoming = [.. pending.Fields.Select(pair => new ImportedField(pair.Key, pair.Value))];
+            existingNotesByStudentId.TryGetValue(pending.Student.Id, out var existingMarkdown);
+            var merge = ImportedFieldsTable.Merge(existingMarkdown, incoming);
+
+            result.Matches.Add(new StudentNotesImportMatch
+            {
+                Student = pending.Student,
+                RawStudentName = pending.RawStudentName,
+                RowNumber = pending.RowNumber,
+                StudentScore = pending.StudentScore,
+                IncomingFields = incoming,
+                Merge = merge
+            });
+        }
+
+        if (result.Matches.Count == 0 && result.Errors.Count == 0)
+            result.Warnings.Add("No students were matched from the CSV.");
+
+        return result;
+    }
+
+    private sealed class PendingStudentFields(Student student)
+    {
+        public Student Student { get; } = student;
+
+        public string RawStudentName { get; set; } = string.Empty;
+
+        public int RowNumber { get; set; }
+
+        public int StudentScore { get; set; }
+
+        public Dictionary<string, string> Fields { get; } = new(StringComparer.OrdinalIgnoreCase);
+    }
+}