using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.IO;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Timers;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Threading;
using H.Pipes;
using InABox.Logging;
using InABox.Wpf;
using Microsoft.Win32;

namespace PRSServer
{
    public static class ItemsControlExtensions
    {
        public static void ScrollIntoView(
            this ItemsControl control,
            object item)
        {
            var framework =
                control.ItemContainerGenerator.ContainerFromItem(item)
                    as FrameworkElement;
            if (framework == null) return;
            framework.BringIntoView();
        }

        public static void ScrollIntoView(this ItemsControl control)
        {
            var count = control.Items.Count;
            if (count == 0) return;
            var item = control.Items[count - 1];
            control.ScrollIntoView(item);
        }
    }

    /// <summary>
    ///     Interaction logic for Console.xaml
    /// </summary>
    public partial class Console : ThemableWindow
    {
        private PipeClient<string> _client;
        public CollectionViewSource _filtered;

        private readonly ObservableCollection<LogEntry> _logentries;

        private readonly bool _monitoronly = true;

        private PRSService _service;
        public string ServiceName { get; private set; }

        private readonly string description;
        private readonly TimeSpan regexTimeOut = TimeSpan.FromMilliseconds(100);

        private Timer? RefreshTimer;

        private Regex? searchRegex;

        public Console(string servicename, string description, bool monitoronly = true)
        {
            ServiceName = servicename;
            _monitoronly = monitoronly;

            InitializeComponent();

            _logentries = new ObservableCollection<LogEntry>();
            _filtered = new CollectionViewSource();
            _filtered.Source = _logentries;
            _filtered.Filter += (sender, args) =>
            {
                var logEntry = (LogEntry)args.Item;
                if (ShowImportant.IsChecked == true && !IsImportant(logEntry))
                {
                    args.Accepted = false;
                    return;
                }

                if (UseRegEx.IsChecked == true && searchRegex != null)
                    args.Accepted = string.IsNullOrWhiteSpace(Search.Text)
                                    || searchRegex.IsMatch(logEntry.DateTime)
                                    || searchRegex.IsMatch(logEntry.Type)
                                    || searchRegex.IsMatch(logEntry.User)
                                    || searchRegex.IsMatch(logEntry.Message);
                else
                    args.Accepted = string.IsNullOrWhiteSpace(Search.Text)
                                    || logEntry.DateTime.Contains(Search.Text)
                                    || logEntry.Type.Contains(Search.Text)
                                    || logEntry.User.Contains(Search.Text)
                                    || logEntry.Message.Contains(Search.Text);
            };
            DataContext = _filtered;


            Title = description;
            this.description = description;
        }

        private bool IsImportant(LogEntry entry)
        {
            return entry.Type == "IMPTNT";
        }

        private LogEntry ParseLogMessage(string logLine)
        {
            var datetime = logLine.Length > 32 ? logLine.Substring(0, 12) : string.Format("{0:HH:mm:ss.fff}", DateTime.Now);
            var type = logLine.Length > 32 ? logLine.Substring(13, 6).Trim() : "INFO";
            var user = logLine.Length > 32 ? logLine.Substring(20, 12) : "";
            var msg = logLine.Length > 32 ? logLine.Substring(33) : logLine;

            return new LogEntry
            {
                DateTime = datetime,
                Type = type,
                User = user,
                Message = msg
            };
        }

        private void Console_Loaded(object sender, RoutedEventArgs e)
        {
            _client = new PipeClient<string>(ServiceName, ".");
            _client.MessageReceived += (o, args) =>
            {
                var m = args.Message;

                var logEntry = ParseLogMessage(args.Message ?? "");
                var logType = logEntry.Type;
                if (logType == "INFO" || logType == "ERROR" || logType == "IMPTNT")
                    Dispatcher.BeginInvoke((Action)(() => { _logentries.Insert(0, logEntry); }));
            };
            _client.Connected += (o, args) =>
            {
                Dispatcher.Invoke(() => LogBorder.Background = new SolidColorBrush(Colors.LightYellow));
            };
            _client.Disconnected += (o, args) =>
            {
                Dispatcher.Invoke(() => LogBorder.Background = new SolidColorBrush(Colors.WhiteSmoke));

                if (RefreshTimer == null)
                {
                    RefreshTimer = new Timer(1000);
                    RefreshTimer.Elapsed += RefreshTimer_Elapsed;
                }
                RefreshTimer.Start();
            };
            _client.ExceptionOccurred += (o, args) =>
            {
                
            };
            if (!_client.IsConnecting)
            {
                _client.ConnectAsync();
            }

            if (!_monitoronly)
            {
                var timer = new DispatcherTimer { Interval = new TimeSpan(0, 0, 3) };
                timer.Tick += (o, args) =>
                {
                    timer.IsEnabled = false;
                    _service = new PRSService(ServiceName, null);
                    _service.Run(ServiceName);
                };
                timer.IsEnabled = true;
            }
        }

        private void RefreshTimer_Elapsed(object? sender, ElapsedEventArgs e)
        {
            if(!_client.IsConnected)
            {
                if (!_client.IsConnecting)
                {
                    _client.ConnectAsync();
                }
            }
            else
            {
                RefreshTimer?.Stop();
            }
        }

        private void Window_Closing(object sender, CancelEventArgs e)
        {
            if (_monitoronly)
            {
                _client.DisposeAsync().AsTask().Wait();
                RefreshTimer?.Stop();
            }
            else
                _service?.Halt();
        }

        private void Search_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Enter && UseRegEx.IsChecked == true)
            {
                try
                {
                    searchRegex = new Regex(Search.Text, RegexOptions.Compiled, regexTimeOut);
                }
                catch (ArgumentException)
                {
                    searchRegex = null;
                }

                _filtered.View.Refresh();
                SetSearchStyleNormal();
            }
        }

        private void SetSearchStyleChanged()
        {
            Search.Background = Brushes.White;
        }

        private void SetSearchStyleNormal()
        {
            Search.Background = Brushes.LightYellow;
        }

        private void Search_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (UseRegEx.IsChecked != true)
            {
                _filtered.View.Refresh();
            }
            else
            {
                if (string.IsNullOrWhiteSpace(Search.Text))
                {
                    searchRegex = null;
                    _filtered.View.Refresh();
                    SetSearchStyleNormal();
                }
                else
                {
                    SetSearchStyleChanged();
                }
            }
        }

        private void UseRegEx_Checked(object sender, RoutedEventArgs e)
        {
            try
            {
                searchRegex = new Regex(Search.Text, RegexOptions.Compiled, regexTimeOut);
            }
            catch (ArgumentException ex)
            {
                searchRegex = null;
            }

            _filtered.View.Refresh();
        }

        private void UseRegEx_Unchecked(object sender, RoutedEventArgs e)
        {
            searchRegex = null;
            _filtered.View.Refresh();

            SetSearchStyleNormal();
        }

        private void SetErrorMessage(string? error)
        {
            if (string.IsNullOrWhiteSpace(error))
            {
                Error.Content = "";
                Error.Visibility = Visibility.Collapsed;
            }
            else
            {
                Error.Content = error;
                Error.Visibility = Visibility.Visible;
            }
        }

        private void LoadLog_Click(object sender, RoutedEventArgs e)
        {
            var dialog = new OpenFileDialog();
            dialog.InitialDirectory = DatabaseEngine.GetPath(ServiceName);
            if (dialog.ShowDialog() == true)
            {
                var logEntries = new List<LogEntry>();

                var numberSkipped = 0;

                var lines = File.ReadLines(dialog.FileName);
                foreach (var line in lines)
                {
                    var logEntry = ParseLogMessage(line ?? "");
                    var logType = logEntry.Type;
                    if (logType == "ERROR" || logType == "INFO" || logType == "IMPTNT")
                        logEntries.Add(logEntry);
                    else if (string.IsNullOrWhiteSpace(logType)) numberSkipped++;
                }

                if (numberSkipped > 0)
                {
                    if (logEntries.Count == 0)
                        SetErrorMessage("File does not contain valid log information!");
                    else
                        SetErrorMessage(string.Format("Skipped {0} lines that did not contain valid log information", numberSkipped));
                }

                Title = dialog.FileName;

                _filtered.Source = logEntries;
                LoadLog.Visibility = Visibility.Collapsed;
                CloseLog.Visibility = Visibility.Visible;
            }
        }

        private void CloseLog_Click(object sender, RoutedEventArgs e)
        {
            _filtered.Source = _logentries;
            CloseLog.Visibility = Visibility.Collapsed;
            LoadLog.Visibility = Visibility.Visible;

            Title = description;
        }

        private void ShowImportant_Checked(object sender, RoutedEventArgs e)
        {
            _filtered.View.Refresh();
        }

        private void ShowImportant_Unchecked(object sender, RoutedEventArgs e)
        {
            _filtered.View.Refresh();
        }
    }
}