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TimetableDesigner.Core/TimetableSpan.cs

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+using System;
+
+namespace TimetableDesigner.Core
+{
+    [Serializable]
+    public class TimetableSpan
+    {
+        #region PROPERTIES
+
+        public TimeOnly From { get; private set; }
+        public TimeOnly To { get; private set; }
+
+        #endregion
+
+
+
+        #region CONSTRUCTORS
+
+        public TimetableSpan(TimeOnly from, TimeOnly to)
+        {
+            if (to <= from)
+            {
+                throw new ArgumentException("\"to\" cannot be less or equal to \"from\"");
+            }
+
+            From = from;
+            To = to;
+        }
+
+        #endregion
+
+
+
+        #region PUBLIC METHODS
+
+        internal TimetableSpansCollision CheckCollision(TimetableSpan slot)
+        {
+            if (slot.To <= this.From)
+            {
+                return TimetableSpansCollision.CheckedSlotBefore;
+            }
+            else if (this.To <= slot.From) 
+            {
+                return TimetableSpansCollision.CheckedSlotAfter;
+            }
+            else
+            {
+                if (this.From < slot.From && slot.To < this.To)
+                {
+                    return TimetableSpansCollision.CheckedSlotIn;
+                }
+                else if (this.From < slot.From && slot.From < this.To && this.To < slot.To)
+                {
+                    return TimetableSpansCollision.CheckedSlotFromIn;
+                }
+                else if (slot.From < this.From && this.From < slot.To && slot.To < this.To)
+                {
+                    return TimetableSpansCollision.CheckedSlotToIn;
+                }
+                else
+                {
+                    throw new ArgumentException("Unknown collision");
+                }
+            }
+        }
+
+        public override bool Equals(object? obj) => obj is TimetableSpan slot && From == slot.From && To == slot.To;
+
+        public override int GetHashCode() => HashCode.Combine(From, To);
+
+        public override string? ToString() => $"{From}-{To}";
+
+        #endregion
+    }
+}