using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace KssSmaPlaLib.Ini
{
    public static class IniReferenceResolveUxer
    {
        public static Dictionary<string, string> ReadSectionWithReference(string path, string section, int maxDepth = 3)
        {
            var allLines = File.ReadAllLines(path, System.Text.Encoding.GetEncoding("shift_jis"));
            var allSections = ParseAllSections(allLines);
            var result = new Dictionary<string, string>();

            if (!allSections.ContainsKey(section)) return result;

            foreach (var kvp in allSections[section])
            {
                result[kvp.Key] = ResolveValue(allSections, kvp.Value, maxDepth);
            }

            return result;
        }

        private static Dictionary<string, Dictionary<string, string>> ParseAllSections(string[] lines)
        {
            var sections = new Dictionary<string, Dictionary<string, string>>();
            string currentSection = null;

            foreach (var line in lines)
            {
                var trimmed = line.Trim();
                if (trimmed.StartsWith(";") || string.IsNullOrEmpty(trimmed)) continue;

                if (trimmed.StartsWith("[") && trimmed.EndsWith("]"))
                {
                    currentSection = trimmed.Substring(1, trimmed.Length - 2);
                    sections[currentSection] = new Dictionary<string, string>();
                }
                else if (currentSection != null && trimmed.Contains("="))
                {
                    var index = trimmed.IndexOf('=');
                    var key = trimmed.Substring(0, index).Trim();
                    var value = trimmed.Substring(index + 1).Trim();
                    sections[currentSection][key] = value;
                }
            }

            return sections;
        }

        private static string ResolveValue(Dictionary<string, Dictionary<string, string>> sections, string value, int depth)
        {
            if (depth <= 0 || string.IsNullOrEmpty(value)) return value;

            var match = System.Text.RegularExpressions.Regex.Match(value, @"^\{\[(.+?)\](.+?)\}$");
            if (match.Success)
            {
                var refSection = match.Groups[1].Value;
                var refKey = match.Groups[2].Value;

                if (sections.ContainsKey(refSection) && sections[refSection].ContainsKey(refKey))
                {
                    var nextValue = sections[refSection][refKey];
                    return ResolveValue(sections, nextValue, depth - 1);
                }
            }

            return value;
        }
    }
}