using System;
using System.Text;
using System.Text.RegularExpressions;
using CodePlay.Core.Interfaces;

namespace CodePlay.Core.Pipeline.Converters;

/// <summary>
/// 属性转方法转换器 - { get; set; } → 私有字段 + getter/setter
/// </summary>
public class PropertyConverter : ILineConverter
{
    public int Priority => 70;
    
    public string Convert(string line, ConversionContext context)
    {
        var propMatch = Regex.Match(line,
            @"^(public|private|protected)\s+(static\s+)?(readonly\s+)?(\w+(?:<[^>]+>)?)\s+(\w+)\s*\{\s*get;\s*set;\s*\}$");
        
        if (!propMatch.Success)
        {
            // 尝试匹配 init-only — 使用与普通属性相同的组索引
            propMatch = Regex.Match(line,
            @"^(public|private|protected)\s+(static\s+)?(\s+)?(\w+(?:<[^>]+>)?)\s+(\w+)\s*\{\s*get;\s*init;\s*\}$");
        }
        
        if (!propMatch.Success) return line;
        
        var access = propMatch.Groups[1].Value;
        var staticMod = propMatch.Groups[2].Success ? "static " : "";
        var readonlyMod = propMatch.Groups[3].Success ? "final " : "";
        var type = propMatch.Groups[4].Value;
        var name = propMatch.Groups[5].Value;
        var camelName = char.ToLowerInvariant(name[0]) + name.Substring(1);
        
        var sb = new StringBuilder();
        sb.AppendLine($"private {staticMod}{readonlyMod}{type} {camelName};");
        sb.AppendLine($"{access} {staticMod}{type} get{name}() {{ return {camelName}; }}");
        sb.AppendLine($"{access} {staticMod}void set{name}({type} value) {{ this.{camelName} = value; }}");
        
        return sb.ToString().TrimEnd();
    }
}