using System.Drawing;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows.Forms;

namespace Dongke.WinForm.Controls
{
    /// <summary>
    /// 编号输入文本框（数字、字母和特殊字符）
    /// </summary>
    [ToolboxBitmap(typeof(TextBox))]
    public class TxtCodeNo : TextBoxCodeBase
    {
        #region 常量
        private static string CODE_NO_REGULAR = @"^(?:[\D]*|[\S\s]*[\D]+)(?<no>[\d]+)(?:[\D]*)$";
        #endregion

        #region 构造函数
        /// <summary>
        /// 编号输入文本框（数字、字母和特殊字符）
        /// </summary>
        public TxtCodeNo()
        {
            this.Regular = this.GetCodeRegular();
        }
        #endregion

        #region 保护方法
        /// <summary>
        /// 获取编号正则表达式
        /// </summary>
        /// <returns></returns>
        protected virtual string GetCodeRegular()
        {
            return CODE_NO_REGULAR;
        }
        #endregion

        #region 公有方法
        /// <summary>
        /// 获取下一个编号
        /// </summary>
        /// <param name="value">增加量</param>
        /// <param name="clip">数值超长后是否截断</param>
        /// <returns>新编号</returns>
        public string GetNextCodeNo(int value = 1, bool clip = false)
        {
            string codeFormat = null;
            decimal number = 0;
            int length = 0;
            if (this.GetMatchCodeNo(out codeFormat, out number, out length))
            {
                return this.GetNextCodeNo(codeFormat, number + value, length, clip);
            }
            return null;
        }
        #endregion

        #region 私有方法
        /// <summary>
        /// 获取条码格式
        /// </summary>
        /// <param name="codeFormat">编号格式化</param>
        /// <param name="number">数值部分</param>
        /// <param name="length">数值部分长度</param>
        /// <returns>条码格式是否正确</returns>
        private bool GetMatchCodeNo(out string codeFormat, out decimal number, out int length)
        {
            return TxtCodeNo.GetMatchCodeNo(this.Text, this.Regular, out codeFormat, out number, out length);
        }

        /// <summary>
        /// 获取下一个编号
        /// </summary>
        /// <param name="codeFormat">编号格式化</param>
        /// <param name="number">数值部分</param>
        /// <param name="length">数值部分长度</param>
        /// <param name="clip">数值超长后是否截断</param>
        /// <returns>新编号</returns>
        private string GetNextCodeNo(string codeFormat, decimal number, int length, bool clip = false)
        {
            string no = number.ToString(string.Empty.PadLeft(length, Constant.C_0));
            if (clip && no.Length > length)
            {
                no = no.Substring(no.Length - length, length);
            }
            return string.Format(codeFormat, no);
        }
        #endregion

        #region 静态方法
        /// <summary>
        /// 获取编号格式
        /// </summary>
        /// <param name="codeNo">编号</param>
        /// <param name="codeRegular">编号正则表达式</param>
        /// <param name="codeFormat">编号格式化</param>
        /// <param name="number">数值部分</param>
        /// <param name="length">数值部分长度</param>
        /// <returns>编号格式是否正确</returns>
        private static bool GetMatchCodeNo(string codeNo, string codeRegular,
            out string codeFormat, out decimal number, out int length)
        {
            codeFormat = codeNo;
            number = 0;
            length = 0;
            bool result = false;

            if (string.IsNullOrWhiteSpace(codeNo) ||
                string.IsNullOrWhiteSpace(codeRegular) ||
                !codeRegular.Contains("?<no>"))
            {
                return result;
            }

            Match match = Regex.Match(codeNo, codeRegular);
            if (match.Success)
            {
                StringBuilder sb = new StringBuilder();
                Group noGroup = match.Groups["no"];
                if (noGroup.Success)
                {
                    string no = noGroup.Value;
                    if (decimal.TryParse(no, out number))
                    {
                        result = true;
                        int index = noGroup.Index;
                        length = noGroup.Length;
                        sb.Append(codeNo.Substring(0, index));
                        sb.Append("{0}");
                        sb.Append(codeNo.Substring(index + length));
                        codeFormat = sb.ToString();
                    }
                }
            }
            return result;
        }
        #endregion
    }
}