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

namespace Biff8Excel.Excel
{
    public class WorkSheetCollection : CollectionBase, IDisposable 
    {
        Dictionary<string, ExcelWorksheet> Dictionary;

        public void Add(ExcelWorksheet worksheet)
        {
            this.Dictionary.Add(worksheet.SheetName, worksheet);
            this.List.Add(worksheet);
        }

        public ExcelWorksheet this[int index]
        {
            // used when referencing an element in the collection
            // vntIndexKey contains either the Index or Key to the collection,
            // this is why it is declared as a Variant
            // Syntax: Set foo = x.Item(xyz) or Set foo = x.Item(5)
            set
            {
                if (index < 1)
                    throw new System.ArgumentException(" smaller than ","index");
                //外部索引从1开始,内部从0开始，要得到外部索引的值必须是内部值-1
                this.List[index-1] = value;
            }
            get
            {
                if (index < 1)
                    throw new System.ArgumentException( " smaller than ","index");

                //外部索引从1开始,内部从0开始，要得到外部索引的值必须是内部值-1
                return this.List[index - 1] as ExcelWorksheet;
            }
        }

        public ExcelWorksheet this[string key]
        {
            set
            {
                if (this.Dictionary.ContainsKey(key))
                    this.Dictionary[key] = value;
                else
                    throw new Biff8ExcelException("no this key" + key);
            }
            get
            {
                ExcelWorksheet ew ; 
                if ( this.Dictionary.TryGetValue(key, out ew))
                    return ew;
                else
                    throw new Biff8ExcelException("no this key" + key);
                //return this.Dictionary[key] as ExcelWorksheet;
            }
        }

        public bool Contains(ExcelWorksheet sheet)
        {
            return this.List.Contains(sheet);
        }

        public void CopyTo(ExcelWorksheet[] sheets, int index)
        {
            this.List.CopyTo(sheets, index);
        }

        public new int Count
        {
            // used when retrieving the number of elements in the
            // collection. Syntax: Debug.Print x.Count
            get { return this.Dictionary.Count; }
        }

        public int IndexOf(ExcelWorksheet sheet)
        {
            return this.List.IndexOf(sheet);
        }

        public void Remove(string vntIndexKey)
        {
            // used when removing an element from the collection
            // vntIndexKey contains either the Index or Key, which is why
            // it is declared as a Variant
            // Syntax: x.Remove(xyz)
            this.Dictionary.Remove(vntIndexKey);
            this.List.Remove(vntIndexKey);
        }

        public WorkSheetCollection()
        {
            Dictionary = new Dictionary<string, ExcelWorksheet>();
        }

        #region IDisposable 成员

        public void Dispose()
        {
            Dictionary = null;
        }

        #endregion
    }
}