using System.Collections.ObjectModel;
using System.ServiceProcess;
using System.Windows;
using System.Windows.Media;
using JJServiceManager.Remote;

namespace JJServiceManager
{
    /// <summary>
    /// 초기화면의 PC 하나 (내 PC 또는 관리 대상 PC)와 그 PC의 서비스 목록
    /// </summary>
    public sealed class HostGroup : ObservableObject
    {
        public const string LocalId = "local";

        private string _title = "";
        private string _statusText = "";
        private Brush _statusBrush = Brushes2.Unknown;
        private bool _isExpanded = true;
        private string _emptyText = "";

        /// <summary>"local" 또는 대상 PC Id</summary>
        public string Id { get; init; } = LocalId;
        public bool IsLocal => Id == LocalId;

        /// <summary>원격 PC일 때 접속</summary>
        public RemoteClient Client { get; init; }

        public ObservableCollection<ServiceRow> Rows { get; } = new ObservableCollection<ServiceRow>();

        /// <summary>제목: "내 PC (HOSTNAME)" 또는 "192.168.0.10 / SERVER01"</summary>
        public string Title { get => _title; set => Set(ref _title, value); }

        /// <summary>서비스 앞에 붙는 표시 (원격: "IP/hostname")</summary>
        public string Prefix => IsLocal ? "" : Title.Replace(" / ", "/");

        public string StatusText { get => _statusText; set => Set(ref _statusText, value); }
        public Brush StatusBrush { get => _statusBrush; set => Set(ref _statusBrush, value); }
        public bool IsExpanded { get => _isExpanded; set => Set(ref _isExpanded, value); }

        public string EmptyText
        {
            get => _emptyText;
            set { if (Set(ref _emptyText, value)) OnPropertyChanged(nameof(EmptyVisibility)); }
        }

        public Visibility EmptyVisibility => Rows.Count == 0 && !string.IsNullOrEmpty(_emptyText) ? Visibility.Visible : Visibility.Collapsed;

        /// <summary>마지막으로 기록한 연결 실패 메시지 (같은 메시지 반복 기록 방지)</summary>
        public string Tag { get; set; }

        /// <summary>원격 PC 제목 줄의 [원격관리] 버튼</summary>
        public Visibility RemoteButtonVisibility => IsLocal ? Visibility.Collapsed : Visibility.Visible;

        public Brush HeaderBrush => IsLocal ? Brushes2.Make("#E3F2FD") : Brushes2.Make("#F3E5F5");

        public HostGroup()
        {
            Rows.CollectionChanged += (s, e) => OnPropertyChanged(nameof(EmptyVisibility));
        }

        public void TitleChanged()
        {
            OnPropertyChanged(nameof(Prefix));
            foreach (var r in Rows) r.HostChanged();
        }

        public override string ToString() => Title;
    }

    /// <summary>초기화면 서비스 목록의 한 줄</summary>
    public sealed class ServiceRow : ObservableObject
    {
        private bool _isChecked;
        private ServiceControllerStatus? _status;
        private bool _statusKnown;
        private bool _isBusy;

        public ServiceEntry Entry { get; }
        public HostGroup Host { get; }
        public bool IsRemote => Host != null && !Host.IsLocal;

        public ServiceRow(ServiceEntry entry, HostGroup host)
        {
            Entry = entry;
            Host = host;
        }

        public string DisplayName => string.IsNullOrEmpty(Entry.DisplayName) ? Entry.ServiceName : Entry.DisplayName;
        public string ServiceName => Entry.ServiceName;
        public string ServiceNameText => string.Equals(Entry.DisplayName, Entry.ServiceName, System.StringComparison.OrdinalIgnoreCase) ? "" : $"({Entry.ServiceName})";

        /// <summary>서비스 앞에 붙는 "IP/hostname" (내 PC는 없음)</summary>
        public string HostPrefix => IsRemote ? Host.Prefix : "";
        public Visibility HostPrefixVisibility => IsRemote ? Visibility.Visible : Visibility.Collapsed;

        /// <summary>로그에 쓰는 이름: "[IP/hostname] [서비스]" 또는 "[서비스]"</summary>
        public string LogName => IsRemote ? $"[{Host.Prefix}] [{DisplayName}]" : $"[{DisplayName}]";

        public string Tooltip => IsRemote
            ? $"대상 PC: {Host.Title}\n서비스명: {Entry.ServiceName}"
            : $"서비스명: {Entry.ServiceName}\n우클릭: 로그 경로 지정";

        public bool IsChecked { get => _isChecked; set => Set(ref _isChecked, value); }

        /// <summary>Start/Stop 진행 중이면 false</summary>
        public bool IsIdle => !_isBusy;
        public bool IsBusy
        {
            get => _isBusy;
            set { if (Set(ref _isBusy, value)) OnPropertyChanged(nameof(IsIdle)); }
        }

        public ServiceControllerStatus? Status
        {
            get => _status;
            set
            {
                if (_statusKnown && _status == value) return;
                _status = value;
                _statusKnown = true;
                OnPropertyChanged();
                OnPropertyChanged(nameof(StatusText));
                OnPropertyChanged(nameof(StatusBrush));
            }
        }

        public bool StatusKnown => _statusKnown;

        /// <summary>원격 PC 연결이 끊긴 경우 등 상태를 모를 때</summary>
        public void MarkUnknown()
        {
            if (!_statusKnown) return;
            _statusKnown = false;
            OnPropertyChanged(nameof(Status));
            OnPropertyChanged(nameof(StatusText));
            OnPropertyChanged(nameof(StatusBrush));
        }

        public string StatusText => _statusKnown ? ServiceOps.StatusText(_status) : (IsRemote ? "연결 안 됨" : "확인 중…");

        public Brush StatusBrush => !_statusKnown ? Brushes2.Unknown : _status switch
        {
            ServiceControllerStatus.Running => Brushes2.Running,
            ServiceControllerStatus.Stopped => Brushes2.Stopped,
            null => Brushes2.Unknown,
            ServiceControllerStatus.Paused => Brushes2.Unknown,
            _ => Brushes2.Pending
        };

        public bool HasLog => !string.IsNullOrWhiteSpace(Entry.LogPath);

        public string LogTooltip
        {
            get
            {
                if (IsRemote)
                    return HasLog
                        ? "대상 PC 로그: " + (Entry.LogIsFolder ? "폴더(최신 파일) " : "") + Entry.LogPath
                        : "대상 PC에서 로그 경로가 지정되지 않았습니다.";
                return HasLog
                    ? (Entry.LogIsFolder ? "폴더(최신 파일): " : "파일: ") + Entry.LogPath + "\n우클릭: 변경"
                    : "로그 경로가 없습니다. 누르면 지정합니다. (우클릭: 변경)";
            }
        }

        public FontWeight LogFontWeight => HasLog ? FontWeights.Bold : FontWeights.Normal;

        public void LogPathChanged()
        {
            OnPropertyChanged(nameof(HasLog));
            OnPropertyChanged(nameof(LogTooltip));
            OnPropertyChanged(nameof(LogFontWeight));
        }

        public void HostChanged()
        {
            OnPropertyChanged(nameof(HostPrefix));
            OnPropertyChanged(nameof(Tooltip));
            OnPropertyChanged(nameof(LogName));
        }

        /// <summary>원격 목록을 새로 받았을 때 이름/로그 경로 갱신</summary>
        public void UpdateFromRemote(RemoteServiceInfo info)
        {
            bool nameChanged = Entry.DisplayName != info.DisplayName;
            bool logChanged = Entry.LogPath != info.LogPath || Entry.LogIsFolder != info.LogIsFolder;
            Entry.DisplayName = info.DisplayName;
            Entry.LogPath = info.LogPath;
            Entry.LogIsFolder = info.LogIsFolder;
            if (nameChanged)
            {
                OnPropertyChanged(nameof(DisplayName));
                OnPropertyChanged(nameof(ServiceNameText));
                OnPropertyChanged(nameof(LogName));
            }
            if (logChanged) LogPathChanged();
            Status = info.Status.HasValue ? (ServiceControllerStatus?)info.Status.Value : null;
        }
    }
}