From fc1fee54cd46ed63e70fe4e242a2cedce5d5ac08 Mon Sep 17 00:00:00 2001
From: AJ Isaacs <ajisaacs27@gmail.com>
Date: Fri, 27 Mar 2026 17:24:43 -0400
Subject: [PATCH] feat: add BomItem model and BomReader Excel parser

---
 OpenNest.IO/Bom/BomItem.cs   | 35 +++++++++++++
 OpenNest.IO/Bom/BomReader.cs | 99 ++++++++++++++++++++++++++++++++++++
 2 files changed, 134 insertions(+)
 create mode 100644 OpenNest.IO/Bom/BomItem.cs
 create mode 100644 OpenNest.IO/Bom/BomReader.cs

diff --git a/OpenNest.IO/Bom/BomItem.cs b/OpenNest.IO/Bom/BomItem.cs
new file mode 100644
index 0000000..0ba0116
--- /dev/null
+++ b/OpenNest.IO/Bom/BomItem.cs
@@ -0,0 +1,35 @@
+namespace OpenNest.IO.Bom
+{
+    public class BomItem
+    {
+        [Column("Item #", "Item Number", "Item Num")]
+        public int? ItemNum { get; set; }
+
+        [Column("File Name")]
+        public string FileName { get; set; }
+
+        [Column("Qty", "Quantity")]
+        public int? Qty { get; set; }
+
+        [Column("Description")]
+        public string Description { get; set; }
+
+        [Column("Part", "Part Name")]
+        public string PartName { get; set; }
+
+        [Column("Config", "Configuration")]
+        public string ConfigurationName { get; set; }
+
+        [Column("Thickness")]
+        public double? Thickness { get; set; }
+
+        [Column("Material")]
+        public string Material { get; set; }
+
+        [Column("K-Factor")]
+        public double? KFactor { get; set; }
+
+        [Column("Default Bend Radius")]
+        public double? DefaultBendRadius { get; set; }
+    }
+}
diff --git a/OpenNest.IO/Bom/BomReader.cs b/OpenNest.IO/Bom/BomReader.cs
new file mode 100644
index 0000000..2351fb4
--- /dev/null
+++ b/OpenNest.IO/Bom/BomReader.cs
@@ -0,0 +1,99 @@
+using ClosedXML.Excel;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+
+namespace OpenNest.IO.Bom
+{
+    public class BomReader : IDisposable
+    {
+        private readonly XLWorkbook workbook;
+        private Dictionary<PropertyInfo, int> columnNameIndexDict;
+
+        public BomReader(string file)
+        {
+            workbook = new XLWorkbook(file);
+            columnNameIndexDict = new Dictionary<PropertyInfo, int>();
+        }
+
+        private IXLWorksheet GetPartsWorksheet()
+        {
+            if (!workbook.TryGetWorksheet("Parts", out var worksheet))
+                throw new InvalidOperationException("BOM file does not contain a 'Parts' worksheet.");
+            return worksheet;
+        }
+
+        private void FindColumnIndexes(IXLWorksheet worksheet)
+        {
+            var lastColumn = worksheet.LastColumnUsed()?.ColumnNumber() ?? 0;
+            var properties = typeof(BomItem).GetProperties();
+
+            foreach (var property in properties)
+            {
+                var column = property.GetCustomAttribute<ColumnAttribute>();
+
+                if (column == null)
+                    continue;
+
+                var classColumnNames = column.Names.Select(n => n.ToUpper());
+
+                for (var columnIndex = 1; columnIndex <= lastColumn; columnIndex++)
+                {
+                    var cell = worksheet.Cell(1, columnIndex);
+                    if (cell.IsEmpty()) continue;
+
+                    var excelColumnName = cell.GetString().ToUpper();
+                    var isMatch = classColumnNames.Any(n => n == excelColumnName);
+
+                    if (!isMatch)
+                        continue;
+
+                    columnNameIndexDict.Add(property, columnIndex);
+                    break;
+                }
+            }
+        }
+
+        public List<BomItem> GetItems()
+        {
+            var worksheet = GetPartsWorksheet();
+
+            FindColumnIndexes(worksheet);
+
+            var lastRow = worksheet.LastRowUsed()?.RowNumber() ?? 1;
+            var items = new List<BomItem>();
+
+            for (var rowIndex = 2; rowIndex <= lastRow; rowIndex++)
+            {
+                var item = new BomItem();
+
+                foreach (var dictItem in columnNameIndexDict)
+                {
+                    var property = dictItem.Key;
+                    var excelColumnIndex = dictItem.Value;
+                    var cell = worksheet.Cell(rowIndex, excelColumnIndex);
+                    var type = property.PropertyType;
+
+                    if (type == typeof(int?))
+                        property.SetValue(item, cell.ToIntOrNull());
+                    else if (type == typeof(string))
+                        property.SetValue(item, cell.IsEmpty() ? null : cell.GetString());
+                    else if (type == typeof(double?))
+                        property.SetValue(item, cell.ToDoubleOrNull());
+                    else
+                        throw new NotImplementedException($"Unsupported property type: {type}");
+                }
+
+                items.Add(item);
+            }
+
+            return items;
+        }
+
+        public void Dispose()
+        {
+            workbook?.Dispose();
+        }
+    }
+}