using Aurora;
using Aurora.Api;
using Aurora.Util.HislogPlus;
using Aurora.View;
using AuroraUIComponent.Sequence;
using AuroraUIComponent.Util.WindowAPI;
using Hermes.Functional;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.IO;
using System.Linq;
using System.Reactive.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web.UI.WebControls;
using System.Windows;
using System.Windows.Input;

namespace AuroraUIComponent.Views
{
    public class UCCSVLogViewModel : NotifyPropertyChangedBase
    {
        IAuroraEnvironment _AuroraEnv;
        public string LogName { get; }

        public DataTable CurrentLog { get => _CurrentLog; set => SetProperty(ref _CurrentLog, value); }
        private DataTable _CurrentLog;

        public DataTable FileLog { get => _FileLog; set => SetProperty(ref _FileLog, value); }
        private DataTable _FileLog;

        public DataTable ViewLog { get => _ViewLog; set => SetProperty(ref _ViewLog, value); }      // Invisible할 때에는 업데이트되지 않도록 CurrentLog와 ViewLog를 별도 관리
        private DataTable _ViewLog;


        public ICommand CMD_VisibleChanged { get; set; }
        public ICommand CMD_Clear { get; set; }
        public ICommand CMD_RefreshList { get; set; }
        public ICommand CMD_OpenFolder { get; set; }


        public string LogDir { get => _LogDir; set => SetProperty(ref _LogDir, value); }
        private string _LogDir;

        const string CURRENT_LOG = "Current";   // 현재 로깅중인 파일을 보여줄 때

        public bool IsCurrentLogShowing { get => SelectedFile == CURRENT_LOG; }
        public string SelectedFile { get => _SelectedFile; set { if (SetProperty(ref _SelectedFile, value)) { if (_IsVisible) { UpdateView(); } } } }
        private string _SelectedFile;

        private string CurrentLogFileName;

        public List<string> FileList { get => _FileList; set => SetProperty(ref _FileList, value); }
        private List<string> _FileList;

        public UCCSVLogViewModel(IAuroraEnvironment env, string name, string logDir)
        {
            _AuroraEnv = env;
            LogName = name;
            LogDir = logDir;

            CMD_VisibleChanged = new DelegateCommand(OnVisibleChanged);

            CMD_Clear = new DelegateCommand(ClearLog);

            CMD_RefreshList = new DelegateCommand(RefreshList);
            CMD_OpenFolder = new DelegateCommand(OpenFolder);

            GetFileList();

            _AuroraEnv.EventObservable.AsObservable(CsvLogSequence.EVENT_NOTIFY_HEADER_ADDED)
                .Select(x => ((string, string, string))x.Param)       // (logItem.Name, logItem.CurLogFileName, logLine)
                .Where(x => x.Item1 == LogName)
                .Subscribe(x => { CurrentLogFileName = x.Item2; AddHeader(x.Item3); });

            _AuroraEnv.EventObservable.AsObservable(CsvLogSequence.EVENT_NOTIFY_LOG_ADDED)
                .Select(x => ((string, string, string))x.Param)       // (logItem.Name, logItem.CurLogFileName, logLine)
                .Where(x => x.Item1 == LogName)
                .Subscribe(x => { CurrentLogFileName = x.Item2; AddLine(x.Item3); });


            _AuroraEnv.EventObservable.AsObservable(CsvLogSequence.EVENT_NOTIFY_LOG_FILE_CHANGED)
                .Select(x => ((string, string, string))x.Param)       // (logItem.Name, logItem.CurLogFileName, logLine)
                .Where(x => x.Item1 == LogName)
                .Subscribe(x => { CurrentLogFileName = x.Item3; GetFileList(); });
        }

        private void OpenFolder(object obj)
        {
            if (!string.IsNullOrEmpty(LogDir) && Directory.Exists(LogDir)) {
                WindowUtil.OpenOrActivateFolder(LogDir);
            }
        }

        private bool _IsVisible = true;
        private void OnVisibleChanged(object obj)
        {
            if (obj is bool isVisible) {
                //Log.FuncW("isVisible : " + isVisible);

                _IsVisible = isVisible;

                SelectedFile = CURRENT_LOG;
                UpdateView();
            }
        }

        private void UpdateView()
        {
            if (_IsVisible) {
                if (SelectedFile == CURRENT_LOG) {
                    ViewLog = CurrentLog;
                } else {
                    ReadCsv(Path.Combine(LogDir, SelectedFile));
                    ViewLog = FileLog;
                }
            } else {
                ViewLog = null;
            }
            NotifyPropertyChanged(nameof(IsCurrentLogShowing));
        }

        private void GetFileList()
        {
            var newList = new List<string>() {
                CURRENT_LOG,
            };

            if (!string.IsNullOrEmpty(LogDir) && Directory.Exists(LogDir)) {
                //Directory.GetFiles(LogDir).ToList().ForEach(x => newList.Add(x));
                Directory.GetFiles(LogDir, "*.csv", SearchOption.TopDirectoryOnly)
                    .Select(Path.GetFileName)
                    .Where(file => File.Exists(Path.Combine(LogDir, file)) && new FileInfo(Path.Combine(LogDir, file)).Length > 0 && CurrentLogFileName != file)
                    .OrderByDescending(x => x)
                    .ForEach(x => newList.Add(x));
            }

            FileList = newList;
        }

        private void RefreshList(object obj)
        {
            GetFileList();
            SelectedFile = CURRENT_LOG;
        }

        private void ClearLog(object obj)
        {
            Application.Current.Dispatcher.BeginInvoke(
                          new Action(() => {
                              if (CurrentLog != null) {
                                  CurrentLog.Rows.Clear();
                              }
                          }));
        }

        private void AddHeader(string singleLine)
        {
            Application.Current.Dispatcher.BeginInvoke(
                          new Action(() => {
                              if (string.IsNullOrEmpty(singleLine)) return;

                              CurrentLog = new DataTable();

                              // 열 이름 설정
                              string[] headers = singleLine.Split(',');
                              foreach (var header in headers) {
                                  CurrentLog.Columns.Add(header);
                              }
                          }));
        }

        private void AddLine(string singleLine)
        {
            Application.Current.Dispatcher.BeginInvoke(
                          new Action(() => {
                              if (string.IsNullOrEmpty(singleLine)) return;

                              if (CurrentLog == null) {
                                  CurrentLog = new DataTable();
                              }

                              //// 데이터 추가
                              var rows = singleLine.Split(',');
                              CurrentLog.Rows.Add(rows);
                          }));
        }

        private void ReadCsv(string filePath)
        {
            if (SelectedFile == CURRENT_LOG) {
                return;
            }

            try {
                Application.Current.Dispatcher.BeginInvoke(
                          new Action(() => {
                              if (string.IsNullOrEmpty(filePath)) return;

                              DataTable dataTable = new DataTable();

                              using (var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
                              using (var reader = new StreamReader(stream)) {
                                  var line = reader.ReadLine();
                                  if (line == null || string.IsNullOrEmpty(line)) return;

                                  // 첫 번째 줄을 읽어 열 이름을 설정
                                  try {
                                      string[] headers = line.Split(',');
                                      foreach (var header in headers) {
                                          if (!dataTable.Columns.Contains(header)) {
                                              dataTable.Columns.Add(header);
                                          } else {
                                              MessageUtil.ShowErrorToast($"Unexpected Error : Duplicated Header : {header}");
                                          }
                                      }
                                  } catch (IOException ioEx) {
                                      MessageUtil.ShowErrorToast($"Reading Header Error : {ioEx.Message}");
                                  } catch (Exception ex) {
                                      MessageUtil.ShowErrorToast($"Reading Header Error : {ex.Message}");
                                  }

                                  // 나머지 줄을 읽어 데이터 추가
                                  while (!reader.EndOfStream) {
                                      var rows = reader.ReadLine().Split(',');
                                      dataTable.Rows.Add(rows);
                                  }
                              }

                              FileLog = dataTable;
                          }));
            } catch (IOException ioEx) {
                MessageBox.Show($"Error reading CSV file: {ioEx.Message}");
            } catch (Exception ex) {
                MessageBox.Show($"Error reading CSV file: {ex.Message}");
            }
        }
    }
}