using System;
using System.Collections;
using System.Collections.Generic;

namespace CPF.ReoGrid.Print
{
	internal class PrintSessionWorksheetCollection : ICollection<Worksheet>, IEnumerable<Worksheet>, IEnumerable
	{
		internal PrintSessionWorksheetCollection(PrintSession session)
		{
			this.session = session;
		}

		public void Add(Worksheet worksheet)
		{
			this.CheckInPrinting();
			this.session.worksheets.Add(worksheet);
		}

		public void Clear()
		{
			this.CheckInPrinting();
		}

		public bool Contains(Worksheet worksheet)
		{
			return this.session.worksheets.Contains(worksheet);
		}

		public void CopyTo(Worksheet[] array, int arrayIndex)
		{
			this.session.worksheets.CopyTo(array, arrayIndex);
		}

		public int Count
		{
			get
			{
				return this.session.worksheets.Count;
			}
		}

		public bool IsReadOnly
		{
			get
			{
				return this.session.IsPrinting;
			}
		}

		public bool Remove(Worksheet worksheet)
		{
			this.CheckInPrinting();
			return this.session.worksheets.Remove(worksheet);
		}

		private void CheckInPrinting()
		{
			bool isPrinting = this.session.IsPrinting;
			if (isPrinting)
			{
				throw new InvalidOperationException("Cannot modify worksheet collection during printing.");
			}
		}

		public IEnumerator<Worksheet> GetEnumerator()
		{
			return this.session.worksheets.GetEnumerator();
		}

		IEnumerator IEnumerable.GetEnumerator()
		{
			return this.session.worksheets.GetEnumerator();
		}

		private PrintSession session;
	}
}