using System;
using System.IO;

namespace Housing.Services
{
    public class LoginSettings
    {
        public bool OfflinePreview { get; set; } = true; // 기본값은 오프라인 테스트 편의를 위해 true
        public string Procedure { get; set; } = string.Empty;
        public string ProcessName { get; set; } = string.Empty;

        private static readonly object _loginLock = new object();
        private static LoginSettings _cachedSettings;
        private static DateTime _lastWriteTime;
        private static string _cachedPath;

        public static LoginSettings Load(string path)
        {
            lock (_loginLock)
            {
                try
                {
                    if (File.Exists(path))
                    {
                        var currentWriteTime = File.GetLastWriteTime(path);
                        if (_cachedSettings != null && _cachedPath == path && _lastWriteTime == currentWriteTime)
                        {
                            return _cachedSettings;
                        }

                        var settings = new LoginSettings();
                        var lines = File.ReadAllLines(path);
                        foreach (var line in lines)
                        {
                            var trimmed = line.Trim();
                            if (trimmed.StartsWith("OfflinePreview", StringComparison.OrdinalIgnoreCase))
                            {
                                var parts = trimmed.Split(new[] { '=' }, 2);
                                if (parts.Length == 2)
                                {
                                    if (bool.TryParse(parts[1].Trim(), out var val))
                                    {
                                        settings.OfflinePreview = val;
                                    }
                                    else if (int.TryParse(parts[1].Trim(), out var intVal))
                                    {
                                        settings.OfflinePreview = intVal != 0;
                                    }
                                }
                            }
                            else if (trimmed.StartsWith("Procedure", StringComparison.OrdinalIgnoreCase))
                            {
                                var parts = trimmed.Split(new[] { '=' }, 2);
                                if (parts.Length == 2)
                                {
                                    settings.Procedure = parts[1].Trim();
                                }
                            }
                            else if (trimmed.StartsWith("ProcessName", StringComparison.OrdinalIgnoreCase))
                            {
                                var parts = trimmed.Split(new[] { '=' }, 2);
                                if (parts.Length == 2)
                                {
                                    settings.ProcessName = parts[1].Trim();
                                }
                            }
                        }
                        _cachedSettings = settings;
                        _lastWriteTime = currentWriteTime;
                        _cachedPath = path;
                        return settings;
                    }
                }
                catch (Exception ex)
                {
                    System.Diagnostics.Debug.WriteLine($"[LoginSettings Load Error] {ex.Message}");
                }
                return _cachedSettings ?? new LoginSettings();
            }
        }
    }
}