using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows.Controls;
using System.Xml.Linq;

namespace TeamAAS_VP.ValidationRules
{
    public class UsernameValidationRule : ValidationRule
    {
        // 最小长度和最大长度
        public int MinLength { get; set; } = 1;
        public int MaxLength { get; set; } = 32;

        public bool AllowEmpty { get; set; } = false;

        // 验证方法
        public override ValidationResult Validate(object value, CultureInfo cultureInfo)
        {
            string input = value as string;

            if (string.IsNullOrWhiteSpace(input) && !AllowEmpty)
                return new ValidationResult(false, "Name cannot be empty.".Replace("\\n", Environment.NewLine).Replace("\\t", "\t"));
            else if (string.IsNullOrWhiteSpace(input) && AllowEmpty)
            {
                return ValidationResult.ValidResult;
            }
            if (input.StartsWith(" ") || input.StartsWith("-") || input.StartsWith("_"))
            {
                return new ValidationResult(false, "The name cannot start with the characters \" \", \"_\" or \"-\".".Replace("\\n", Environment.NewLine).Replace("\\t", "\t"));
            }

            string msg = "Name must be between {MinLength} and {MaxLength} characters.".Replace("\\n", Environment.NewLine).Replace("\\t", "\t");

            // 修复：计算字符串的实际长度，将汉字视为两个字符
            int actualLength = input.Length;//input.Sum(c => c > 127 ? 2 : 1);

            if (actualLength < MinLength || actualLength > MaxLength)
                return new ValidationResult(false, msg.Replace("{MinLength}", MinLength.ToString()).Replace("{MaxLength}", MaxLength.ToString()));

            //if (!Regex.IsMatch(input, @"^[\u4e00-\u9fa5\u3040-\u309F\u30A0-\u30FFa-zA-Z0-9_ -]{1,32}$"))
            //    return new ValidationResult(false, App.Current.Resources["ValidationRules.Name.Hint3"] as string);

            //@"^[\p{L}\p{M}0-9_ -]{1,32}$"
            if (!Regex.IsMatch(input, @"^(?:[\p{L}\p{M}0-9_ -]|[\uFF00-\uFFFF]|[^\x00-\xFF]){1,32}$", RegexOptions.Compiled))
                return new ValidationResult(false, "Name contains invalid characters.".Replace("\\n", Environment.NewLine).Replace("\\t", "\t"));
            // 如果所有检查通过，返回验证成功
            return ValidationResult.ValidResult;
        }

        public static bool IsValidCharacter(string input)
        {
            foreach (char c in input)
            {
                // 获取字符的 Unicode 码点
                int codePoint = (int)c;

                // 检查是否属于常见的汉字区、扩展区、补充平面等范围
                if ((codePoint >= 0x4E00 && codePoint <= 0x9FFF) ||   // 基本汉字区 (U+4E00 - U+9FFF)
                    (codePoint >= 0x3400 && codePoint <= 0x4DBF) ||   // 扩展A区 (U+3400 - U+4DBF)
                    (codePoint >= 0x20000 && codePoint <= 0x2A6DF) || // 扩展B区 (U+20000 - U+2A6DF)
                    (codePoint >= 0x2A700 && codePoint <= 0x2B73F) || // 扩展C区 (U+2A700 - U+2B73F)
                    (codePoint >= 0x2B740 && codePoint <= 0x2B81F) || // 扩展D区 (U+2B740 - U+2B81F)
                    (codePoint >= 0x2B820 && codePoint <= 0x2CEAF) || // 扩展E区 (U+2B820 - U+2CEAF)
                    (codePoint >= 0x2CEB0 && codePoint <= 0x2EBEF) || // 扩展F区 (U+2CEB0 - U+2EBEF)
                    (codePoint >= 0x3040 && codePoint <= 0x309F) ||   // 平假名区 (U+3040 - U+309F)
                    (codePoint >= 0x30A0 && codePoint <= 0x30FF))     // 片假名区 (U+30A0 - U+30FF)
                {
                    continue;  // 如果字符在合法的 Unicode 区域内，继续检查下一个字符
                }
                else
                {
                    return false; // 如果字符不在合法范围内，则返回 false
                }
            }

            // 如果都没匹配，返回false
            return false;
        }
    }
}