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

namespace IOTContainer.SQLite
{
    /// <summary>
    /// 字段信息列表
    /// </summary>
    public class SQLiteColumnList : IList<SQLiteColumn>
    {
        #region 构造函数
        public SQLiteColumnList()
        {
            this._columns = new List<SQLiteColumn>();
        }
        #endregion

        #region 字段属性
        /// <summary>
        /// 字段信息集合
        /// </summary>
        private List<SQLiteColumn> _columns;

        /// <summary>
        /// 获取设置字段信息
        /// </summary>
        /// <param name="index">索引</param>
        /// <returns>字段信息</returns>
        public SQLiteColumn this[int index]
        {
            get
            {
                return this._columns[index];
            }
            set
            {
                if (this._columns[index].ColumnName != value.ColumnName)
                {
                    CheckColumnName(value.ColumnName);
                }

                this._columns[index] = value;
            }
        }

        /// <summary>
        /// 字段信息数量
        /// </summary>
        public int Count
        {
            get { return this._columns.Count; }
        }

        public bool IsReadOnly
        {
            get { return false; }
        }
        #endregion

        #region 外部函数
        /// <summary>
        /// 获取字段信息下标
        /// </summary>
        /// <param name="item">字段信息</param>
        /// <returns>下标</returns>
        public int IndexOf(SQLiteColumn item)
        {
            return this._columns.IndexOf(item);
        }

        /// <summary>
        /// 插入字段信息
        /// </summary>
        /// <param name="index">下标</param>
        /// <param name="item">字段信息</param>
        public void Insert(int index, SQLiteColumn item)
        {
            CheckColumnName(item.ColumnName);

            this._columns.Insert(index, item);
        }

        /// <summary>
        /// 移除字段信息
        /// </summary>
        /// <param name="index">下标</param>
        public void RemoveAt(int index)
        {
            this._columns.RemoveAt(index);
        }

        /// <summary>
        /// 添加字段信息
        /// </summary>
        /// <param name="item">字段信息</param>
        public void Add(SQLiteColumn item)
        {
            CheckColumnName(item.ColumnName);

            this._columns.Add(item);
        }

        /// <summary>
        /// 是否包含字段信息
        /// </summary>
        /// <param name="item">字段信息</param>
        /// <returns>true:是,false:否</returns>
        public bool Contains(SQLiteColumn item)
        {
            return this._columns.Contains(item);
        }

        /// <summary>
        /// 复制字段信息
        /// </summary>
        /// <param name="array">字段信息数组</param>
        /// <param name="arrayIndex">其实位置</param>
        public void CopyTo(SQLiteColumn[] array, int arrayIndex)
        {
            this._columns.CopyTo(array, arrayIndex);
        }

        /// <summary>
        /// 移除字段信息
        /// </summary>
        /// <param name="item">字段信息</param>
        /// <returns>true:是,false:否</returns>
        public bool Remove(SQLiteColumn item)
        {
            return this._columns.Remove(item);
        }

        /// <summary>
        /// 获取迭代器
        /// </summary>
        /// <returns>迭代器</returns>
        public IEnumerator<SQLiteColumn> GetEnumerator()
        {
            return this._columns.GetEnumerator();
        }

        /// <summary>
        /// 获取迭代器
        /// </summary>
        /// <returns>迭代器</returns>
        IEnumerator IEnumerable.GetEnumerator()
        {
            return this._columns.GetEnumerator();
        }

        /// <summary>
        /// 清理
        /// </summary>
        public void Clear()
        {
            this._columns.Clear();
        }
        #endregion

        #region 内部函数
        /// <summary>
        /// 检查列名
        /// </summary>
        /// <param name="colName">列名</param>
        private void CheckColumnName(string colName)
        {
            if (this._columns.FirstOrDefault(x => x.ColumnName == colName) != null)
                throw new Exception("Column name of \"" + colName + "\" is already existed.");
        }
        #endregion
    }
}