using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using FireBirdUtil.SqlUtils;

namespace FireBirdUtil.DataTypes
{
	public class FieldInfo
	{
		private bool _IsKey = false;
		public bool IsKey { get { return _IsKey; } set { _IsKey = value; } }

		private bool _IsNotNull = false;
		public bool IsNotNull { get { return _IsNotNull; } set { _IsNotNull = value; } }

		private bool _IsAutoIncrease = false;
		public bool IsAutoIncrease { get { return _IsAutoIncrease; } set { _IsAutoIncrease = value; } }
		/// <summary>
		/// 字段名称
		/// </summary>
		public string FieldName { get; set; }
		/// <summary>
		/// 字段类型
		/// </summary>//TODO:学习FireBird的数据类型，然后重写该类相关方法或重新设计该类
		public FBType FieldType { get; set; }//TODO:把类型改为与C#的类型对应起来.可用一个单独的类实现
		/// <summary>
		/// 字段类型参数。如：“varchar(20)”中的“(20)”
		/// </summary>
		public string FieldTypeParams { get; set; }//TODO:是否可考虑将括号去掉，在本程序中实现？

		//TODO:是否考虑支持数组。firebird支持数组

		/// <summary>
		/// 获取字段信息
		/// </summary>
		public string GetSQL()
		{
#if DEBUG
			if (string.IsNullOrEmpty(FieldName))
				throw new ArgumentException("FieldName参数没有赋值");
			if (FieldType == 0)
				throw new ArgumentException("FieldType参数没有赋值。该参数表示数据库中字段的类型");
#endif
			string sql = FieldName + " " + FieldType.ToTypeString();
			if (!string.IsNullOrEmpty(FieldTypeParams))
				sql += FieldTypeParams;
			if (_IsNotNull)
				sql += " not null";
			if (_IsKey)
				sql += " primary key";
			return sql;
		}

		/// <summary>
		/// 创建自增变量的SQL语句
		/// </summary>
		public string GetSql_AddGenerator(string tableName)
		{
			return SqlUtil.GetSql_AddGenerator(tableName);
		}

		/// <summary>
		/// 查找指定自增变量的数量（用于判断是否存在指定自增变量）
		/// </summary>
		public string GetSql_SelectGeneratorCount(string tableName)
		{
			return SqlUtil.GetSql_SelectGeneratorCount(tableName);
		}

		/// <summary>
		/// 删除自增变量的SQL语句
		/// </summary>
		public string GetSql_DropGenerator(string tableName)
		{
			return SqlUtil.GetSql_DropGenerator(tableName);
		}

		public string GetSql_AddAutoIncreaseTrigger(string tableName)
		{
			return GetSql_AddAutoIncreaseTrigger(tableName, null);
		}

		public string GetSql_AddAutoIncreaseTrigger(string tableName, string AutoIncreasedFieldTypeIfNotNum)
		{//TODO:未测试AutoIncreasedFieldTypeIfNotNum不为空的情况
			return SqlUtil.GetSql_AddAutoIncreaseTrigger(tableName, FieldName, AutoIncreasedFieldTypeIfNotNum);
		}
	}
}