using System.Collections.Generic;

namespace CustomOpenAddins
{
    /// <summary>
    /// 数字匹配工具类
    /// </summary>
    public static class NumberMatcher
    {
        /// <summary>
        /// 匹配中文数字的正则表达式（零到九，包含大写）
        /// </summary>
        private const string ChineseNumberPattern = "[零一二三四五六七八九壹贰叁肆伍陆柒捌玖两]";

        /// <summary>
        /// 匹配希腊数字的正则表达式（Ⅰ到Ⅹ）
        /// </summary>
        private const string GreekNumberPattern = "[ⅠⅡⅢⅣⅤⅥⅦⅧⅨ]";

        /// <summary>
        /// 检查字符串是否是中文数字
        /// </summary>
        /// <param name="input">输入字符串</param>
        /// <returns>是否匹配</returns>
        public static bool IsChineseNumber(string input)
        {
            if (string.IsNullOrEmpty(input))
                return false;

            return System.Text.RegularExpressions.Regex.IsMatch(input, $"^{ChineseNumberPattern}$");
        }

        /// <summary>
        /// 检查字符串是否是希腊数字
        /// </summary>
        /// <param name="input">输入字符串</param>
        /// <returns>是否匹配</returns>
        public static bool IsGreekNumber(string input)
        {
            if (string.IsNullOrEmpty(input))
                return false;

            return System.Text.RegularExpressions.Regex.IsMatch(input, $"^{GreekNumberPattern}$");
        }

        /// <summary>
        /// 从字符串中提取第一个匹配的数字（中文或希腊数字）
        /// </summary>
        /// <param name="input">输入字符串</param>
        /// <returns>匹配到的数字字符串，未匹配返回null</returns>
        public static string ExtractFirstNumber(string input)
        {
            if (string.IsNullOrEmpty(input))
                return null;

            var pattern = $"({ChineseNumberPattern}|{GreekNumberPattern})";
            var match = System.Text.RegularExpressions.Regex.Match(input, pattern);

            return match.Success ? match.Value : null;
        }

        /// <summary>
        /// 从字符串中提取所有匹配的数字（中文或希腊数字）
        /// </summary>
        /// <param name="input">输入字符串</param>
        /// <returns>匹配到的数字字符串集合</returns>
        public static IEnumerable<string> ExtractAllNumbers(string input)
        {
            if (string.IsNullOrEmpty(input))
                yield break;

            var pattern = $"({ChineseNumberPattern}|{GreekNumberPattern})";
            var matches = System.Text.RegularExpressions.Regex.Matches(input, pattern);

            foreach (System.Text.RegularExpressions.Match match in matches)
            {
                yield return match.Value;
            }
        }
    }

}