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;

namespace TeamAAS_VP.ValidationRules
{
    public class CommentValidationRule : ValidationRule
    {
        // 最小长度和最大长度
        public int MinLength { get; set; } = 0;
        public int MaxLength { get; set; } = 256;

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

            if (!string.IsNullOrWhiteSpace(input))
            {
                string msg = "Content 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);
                int count = input.Split(new string[] { "\r\n" }, StringSplitOptions.None).Length - 1;
                int charactersCount = actualLength - count;
                if (charactersCount < MinLength || charactersCount > MaxLength)
                {
                    if (msg==null)
                    {
                        msg = "Content must be between {MinLength} and {MaxLength} characters.";
                    }
                    return new ValidationResult(false, msg.Replace("{MinLength}", MinLength.ToString()).Replace("{MaxLength}", MaxLength.ToString()));
                } 
            }
            // 如果所有检查通过，返回验证成功
            return ValidationResult.ValidResult;
        }
    }
}