using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data.Entity;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using Tango.BL;
using Tango.BL.Builders;
using Tango.BL.Entities;
using Tango.BL.Enumerations;
using Tango.BL.ValueObjects;
using Tango.Core.Commands;
using Tango.Core.ExtensionMethods;
using Tango.MachineStudio.Common;
using Tango.SharedUI.Components;

namespace Tango.MachineStudio.ActionLogs.ViewModels
{
    public class MainViewVM : StudioViewModel
    {
        #region Properties
        
        private DateTime _startSelectedDate;
        public DateTime StartSelectedDate
        {
            get { return _startSelectedDate; }
            set { _startSelectedDate = value; RaisePropertyChangedAuto(); }
        }

        private DateTime _endSelectedDate;
        public DateTime EndSelectedDate
        {
            get { return _endSelectedDate; }
            set { _endSelectedDate = value; RaisePropertyChangedAuto(); }
        }

        private string _searchFilter;
        public string SearchFilter
        {
            get { return _searchFilter; }
            set { _searchFilter = value; RaisePropertyChangedAuto(); }
        }

        private ObservableCollection<ActionLog> _actionLogs;
        public ObservableCollection<ActionLog> ActionLogs
        {
            get { return _actionLogs; }
            set { _actionLogs = value; RaisePropertyChanged(nameof(ActionLogs)); }
        }

        private SelectedObjectCollection<ActionLogType> _selectedActionLogTypes;
        public SelectedObjectCollection<ActionLogType> SelectedActionLogTypes
        {
            get { return _selectedActionLogTypes; }
            set { _selectedActionLogTypes = value;
                RaisePropertyChanged(nameof(SelectedActionLogTypes)); }
        }

        private ActionLog _selectedActionLog = null;
        public ActionLog SelectedActionLog
        {
            get { return _selectedActionLog; }
            set {  _selectedActionLog = value;
                SelectedItemChanged();
                RaisePropertyChangedAuto();
                InvalidateRelayCommands();
            }
        }

        private ActionLogDifference _differenceObject;
        public ActionLogDifference DifferenceObject
        {
            get { return _differenceObject; }
            set { _differenceObject = value; RaisePropertyChangedAuto(); }
        }

        
        private bool _isRunning;
        public bool IsRunning
        {
            get { return _isRunning; }
            set { _isRunning = value; }
        }

        #endregion
        
        public RelayCommand SearchCommand { get; set; }
        public RelayCommand CopyToClipBoardCommand { get; set; }
        public RelayCommand CopyRelateObjectIDCommand { get; set; }

        public MainViewVM()
        {
            ActionLogs = new ObservableCollection<ActionLog>();
            SearchCommand = new RelayCommand(GetActionLogs, ()=> !IsRunning);
            CopyRelateObjectIDCommand = new RelayCommand(CopyRelateObjectID);
            CopyToClipBoardCommand = new RelayCommand(CopyToClipBoard, () => SelectedActionLog != null && SelectedActionLog.DifferenceObject != null);
            DateTime now = DateTime.Now;
            StartSelectedDate = now.AddMonths(-1);
            EndSelectedDate = now;
            _isRunning = false;
            var source = Enum.GetValues(typeof(ActionLogType)).Cast<ActionLogType>().ToObservableCollection();
            var syncedSource = Enum.GetValues(typeof(ActionLogType)).Cast<ActionLogType>().ToObservableCollection();

            SelectedActionLogTypes = new SelectedObjectCollection<ActionLogType>(source, syncedSource);
        }

        public override void OnApplicationReady()
        {

        }
       
        private void CopyToClipBoard()
        {
            DataObject data = new DataObject(SelectedActionLog.DifferenceObject.ToJsonString());
            System.Windows.Clipboard.SetDataObject(data);
           
        }
        private void CopyRelateObjectID()
        {
            DataObject data = new DataObject(SelectedActionLog.RelatedObjectGuid);
            System.Windows.Clipboard.SetDataObject(data);
        }

        /// <summary>
        /// New Database Query with search parameters. Initialization ActionLogs property.
        /// </summary>
        private async void GetActionLogs()
        {
            string filter = SearchFilter?.ToLower();

            if (String.IsNullOrWhiteSpace(filter)) filter = null;

            using (ObservablesContext db = ObservablesContext.CreateDefault())
            {
                DateTime startUtc = StartSelectedDate.ToUniversalTime();
                TimeSpan offsetTime = (EndSelectedDate.Date == DateTime.Now.Date)? DateTime.Now.TimeOfDay : new TimeSpan(23, 59, 59);
                DateTime endUtc = EndSelectedDate.ToUniversalTime()+ offsetTime;
                IsRunning = true;
                ActionLogs = await new ActionLogsCollectionBuilder(db).Set(x => x.LastUpdated <= DbFunctions.TruncateTime(endUtc) && x.LastUpdated >= DbFunctions.TruncateTime(startUtc.Date))
                    .WithUsers()
                    .WithActionType(SelectedActionLogTypes.SynchedSource.ToArray())
                    .Query(y => y.Where
                    (x => filter == null || 
                    (x.ID.ToString().ToLower().StartsWith(filter) 
                    || (x.RelatedObjectName != null && x.RelatedObjectName.ToLower().StartsWith(filter)) 
                    || (x.RelatedObjectGuid != null && x.RelatedObjectGuid.ToLower().StartsWith(filter))
                    || (x.User != null && x.User.Contact != null && x.User.Contact.FullName.ToLower().StartsWith(filter)))))
                    .BuildAsync();
                IsRunning = false;
            }
        }
        
        private void SelectedItemChanged()
        {
            if (SelectedActionLog == null || SelectedActionLog.DifferenceObject== null)
                return;
            DifferenceObject = SelectedActionLog.DifferenceObject;
        }
    }
}