fix: 按尾号标准计算最小刀径，排除粉尘刀与去毛刺刀

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

ToolItem.cs

@@ -30,6 +30,19 @@ namespace DrillTools
         Special     // 7 - 特殊刀具
     }
 
+    /// <summary>
+    /// 最小刀径参数分组（按尾号使用标准）
+    /// </summary>
+    public enum MinDiameterParameterGroup
+    {
+        None,
+        Drill,
+        Slot,
+        EA,
+        Dust,
+        Deburr
+    }
+
     /// <summary>
     /// 刀具大类枚举
     /// </summary>
@@ -330,5 +343,77 @@ namespace DrillTools
                 _ => "未知"
             };
         }
+
+        /// <summary>
+        /// 0.749mm 不参与界面最小孔径显示。
+        /// </summary>
+        public const double MinDiameterExcludedDiameter = 0.749;
+
+        /// <summary>
+        /// 按尾号使用标准映射到最小刀径参数分组。
+        /// 0/5/8/9→钻针，1→槽刀，2/6→EA，3→粉尘刀，4→去毛刺刀(BSH)，7→不设定参数。
+        /// </summary>
+        public static MinDiameterParameterGroup GetMinDiameterParameterGroup(ToolSuffixType suffixType)
+        {
+            return suffixType switch
+            {
+                ToolSuffixType.Drill => MinDiameterParameterGroup.Drill,
+                ToolSuffixType.NonStandard => MinDiameterParameterGroup.Drill,
+                ToolSuffixType.Slot => MinDiameterParameterGroup.Slot,
+                ToolSuffixType.EASlot or ToolSuffixType.EASlot2 => MinDiameterParameterGroup.EA,
+                ToolSuffixType.DustSlot => MinDiameterParameterGroup.Dust,
+                ToolSuffixType.DeburrSlot => MinDiameterParameterGroup.Deburr,
+                ToolSuffixType.Special => MinDiameterParameterGroup.None,
+                _ => MinDiameterParameterGroup.None
+            };
+        }
+
+        /// <summary>
+        /// 按尾号规则计算最小钻针、槽刀、EA 刀直径。
+        /// 粉尘刀与去毛刺刀使用独立参数表，不参与三者最小值；特殊刀与固定孔径不参与。
+        /// </summary>
+        /// <param name="tools">刀具集合</param>
+        /// <param name="exclude749ForDisplay">为 true 时排除 0.749mm（界面显示用）</param>
+        public static (double MinDrill, double MinSlot, double MinEA) CalculateMinDiameters(
+            IEnumerable<ToolItem> tools,
+            bool exclude749ForDisplay = false)
+        {
+            double minDrill = 0;
+            double minSlot = 0;
+            double minEA = 0;
+
+            foreach (var tool in tools)
+            {
+                if (tool.ToolType == ToolType.MachineCode)
+                    continue;
+
+                if (IsSpecialFixedDiameter(tool.Diameter))
+                    continue;
+
+                if (exclude749ForDisplay
+                    && Math.Abs(tool.Diameter - MinDiameterExcludedDiameter) < 0.001)
+                {
+                    continue;
+                }
+
+                switch (GetMinDiameterParameterGroup(tool.ToolSuffixType))
+                {
+                    case MinDiameterParameterGroup.Drill:
+                        if (minDrill == 0 || tool.Diameter < minDrill)
+                            minDrill = tool.Diameter;
+                        break;
+                    case MinDiameterParameterGroup.Slot:
+                        if (minSlot == 0 || tool.Diameter < minSlot)
+                            minSlot = tool.Diameter;
+                        break;
+                    case MinDiameterParameterGroup.EA:
+                        if (minEA == 0 || tool.Diameter < minEA)
+                            minEA = tool.Diameter;
+                        break;
+                }
+            }
+
+            return (minDrill, minSlot, minEA);
+        }
     }
-}
+}