using System.Collections.Generic;


/// <summary>
/// 十以内数字转换工具类
/// </summary>
public static class SimpleNumberConverter
{
    private static readonly Dictionary<char, int> ChineseNumbers = new Dictionary<char, int>
    {
        {'零', 0}, {'一', 1}, {'二', 2}, {'三', 3}, {'四', 4},
        {'五', 5}, {'六', 6}, {'七', 7}, {'八', 8}, {'九', 9},
        {'壹', 1}, {'贰', 2}, {'叁', 3}, {'肆', 4}, {'伍', 5},
        {'陆', 6}, {'柒', 7}, {'捌', 8}, {'玖', 9},
        {'两', 2} // 特殊处理"两"
    };

    private static readonly Dictionary<string, int> GreekNumbers = new Dictionary<string, int>
    {
        {"Ⅰ", 1}, {"Ⅱ", 2}, {"Ⅲ", 3}, {"Ⅳ", 4}, {"Ⅴ", 5},
        {"Ⅵ", 6}, {"Ⅶ", 7}, {"Ⅷ", 8}, {"Ⅸ", 9}
    };

    /// <summary>
    /// 将中文数字转换为阿拉伯数字（仅支持1-9）
    /// </summary>
    /// <param name="chineseNumber">中文数字字符</param>
    /// <returns>转换后的阿拉伯数字，转换失败返回-1</returns>
    public static int ChineseToArabic(char chineseNumber)
    {
        return ChineseNumbers.TryGetValue(chineseNumber, out int result) ? result : -1;
    }

    /// <summary>
    /// 将希腊数字转换为阿拉伯数字（仅支持1-10）
    /// </summary>
    /// <param name="greekNumber">希腊数字字符串</param>
    /// <returns>转换后的阿拉伯数字，转换失败返回-1</returns>
    public static int GreekToArabic(string greekNumber)
    {
        return GreekNumbers.TryGetValue(greekNumber, out int result) ? result : -1;
    }

    /// <summary>
    /// 智能转换数字（支持中文数字和希腊数字，限10以内）
    /// </summary>
    /// <param name="number">要转换的数字字符串</param>
    /// <returns>转换后的阿拉伯数字，转换失败返回-1</returns>
    public static int ToArabic(string number)
    {
        if (string.IsNullOrEmpty(number))
            return -1;

        // 尝试直接转换阿拉伯数字
        if (int.TryParse(number, out int result) && result >= 0 && result < 10)
            return result;

        // 尝试转换希腊数字
        int greek = GreekToArabic(number);
        if (greek != -1)
            return greek;

        // 尝试转换单个中文数字
        if (number.Length == 1)
            return ChineseToArabic(number[0]);

        return -1;
    }
}