using System;
using System.Collections.Generic;
using System.Drawing;
using System.Threading.Tasks;
using System.Windows.Input;
using MediatR;
using ModernKeePass.Application.Database.Commands.SaveDatabase;
using ModernKeePass.Application.Entry.Commands.SetFieldValue;
using ModernKeePass.Application.Group.Commands.DeleteEntry;
using ModernKeePass.Application.Resources.Queries;
using ModernKeePass.Application.Security.Commands.GeneratePassword;
using ModernKeePass.Application.Security.Queries.EstimatePasswordComplexity;
using ModernKeePass.Common;
using ModernKeePass.Interfaces;

namespace ModernKeePass.ViewModels
{
    public class EntryVm : NotifyPropertyChangedBase, IVmEntity, ISelectableModel
    {
        public GroupVm ParentGroup { get; private set; }
        public GroupVm PreviousGroup { get; private set; }
        public bool IsRevealPasswordEnabled => !string.IsNullOrEmpty(Password);
        public bool HasExpired => HasExpirationDate && ExpiryDate < DateTime.Now;
        public double PasswordComplexityIndicator => _mediator.Send(new EstimatePasswordComplexityQuery {Password = Password}).GetAwaiter().GetResult();
        public bool UpperCasePatternSelected { get; set; } = true;
        public bool LowerCasePatternSelected { get; set; } = true;
        public bool DigitsPatternSelected { get; set; } = true;
        public bool MinusPatternSelected { get; set; }
        public bool UnderscorePatternSelected { get; set; }
        public bool SpacePatternSelected { get; set; }
        public bool SpecialPatternSelected { get; set; }
        public bool BracketsPatternSelected { get; set; }
        public string CustomChars { get; set; } = string.Empty;
        public string Id => _entry.Id;
        public bool IsRecycleOnDelete => _database.RecycleBinEnabled && !ParentGroup.IsSelected;
        public IEnumerable<IVmEntity> BreadCrumb => new List<IVmEntity>(ParentGroup.BreadCrumb) {ParentGroup};
        /// <summary>
        /// Determines if the Entry is current or from history
        /// </summary>
        public bool IsSelected { get; set; } = true;

        public double PasswordLength
        {
            get { return _passwordLength; }
            set
            {
                _passwordLength = value;
                OnPropertyChanged();
            }
        }

        public string Title
        {
            get { return _entry.Title; }
            set { _mediator.Send(new SetFieldValueCommand { EntryId = Id, FieldName = nameof(Title), FieldValue = value}); }
        }


        public string UserName
        {
            get { return _entry.Username; }
            set { _mediator.Send(new SetFieldValueCommand { EntryId = Id, FieldName = nameof(UserName), FieldValue = value }); }
        }

        public string Password
        {
            get { return _entry.Password; }
            set
            {
                _mediator.Send(new SetFieldValueCommand { EntryId = Id, FieldName = nameof(Password), FieldValue = value });
                OnPropertyChanged();
                OnPropertyChanged(nameof(PasswordComplexityIndicator));
            }
        }
        
        public string Url
        {
            get { return _entry.Url.ToString();}
            set { _mediator.Send(new SetFieldValueCommand { EntryId = Id, FieldName = nameof(Url), FieldValue = value }); }
        }

        public string Notes
        {
            get { return _entry.Notes; }
            set { _mediator.Send(new SetFieldValueCommand { EntryId = Id, FieldName = nameof(Notes), FieldValue = value }); }
        }

        public int Icon
        {
            get
            {
                if (HasExpired) return (int)Domain.Enums.Icon.ReportHacked;
                return (int) _entry.Icon;
            }
            set { _mediator.Send(new SetFieldValueCommand { EntryId = Id, FieldName = nameof(Icon), FieldValue = value }); }
        }

        public DateTimeOffset ExpiryDate
        {
            get { return _entry.ExpirationDate; }
            set
            {
                if (!HasExpirationDate) return;
                _mediator.Send(new SetFieldValueCommand { EntryId = Id, FieldName = "ExpirationDate", FieldValue = value.Date });
            }
        }

        public TimeSpan ExpiryTime
        {
            get { return _entry.ExpirationDate.TimeOfDay; }
            set
            {
                if (!HasExpirationDate) return;
                _mediator.Send(new SetFieldValueCommand { EntryId = Id, FieldName = "ExpirationDate", FieldValue = ExpiryDate.Date.Add(value) });
            }
        }

        public bool IsEditMode
        {
            get { return IsSelected && _isEditMode; }
            set
            {
                _isEditMode = value;
                OnPropertyChanged();
            }
        }
        
        public bool IsVisible
        {
            get { return _isVisible; }
            set
            {
                _isVisible = value;
                OnPropertyChanged();
            }
        }
        
        public bool IsRevealPassword
        {
            get { return _isRevealPassword; }
            set
            {
                _isRevealPassword = value;
                OnPropertyChanged();
            }
        }
        public bool HasExpirationDate
        {
            get { return _entry.HasExpirationDate; }
            set
            {
                _mediator.Send(new SetFieldValueCommand {EntryId = Id, FieldName = nameof(HasExpirationDate), FieldValue = value});
                OnPropertyChanged();
            }
        }

        public IEnumerable<IVmEntity> History
        {
            get
            {
                var history = new Stack<EntryVm>();
                foreach (var historyEntry in _entry.History)
                {
                    history.Push(new EntryVm(historyEntry, ParentGroup) {IsSelected = false});
                }
                history.Push(this);

                return history;
            }
        }


        public Color? BackgroundColor
        {
            get { return _entry?.BackgroundColor; }
            set
            {
                if (value != null) _entry.BackgroundColor = (Color) value;
            }
        }

        public Color? ForegroundColor
        {
            get { return _entry?.ForegroundColor; }
            set
            {
                if (value != null) _entry.ForegroundColor = (Color)value;
            }
        }

        public ICommand SaveCommand { get; }
        public ICommand GeneratePasswordCommand { get; }
        public ICommand UndoDeleteCommand { get; }
        
        private readonly Application.Entry.Models.EntryVm _entry;
        private readonly IMediator _mediator;
        private bool _isEditMode;
        private bool _isRevealPassword;
        private double _passwordLength = 25;
        private bool _isVisible = true;
        
        public EntryVm() { }
        
        internal EntryVm(Application.Entry.Models.EntryVm entry, GroupVm parent) : this(entry, parent, App.Mediator) { }

        public EntryVm(Application.Entry.Models.EntryVm entry, GroupVm parent, IMediator mediator)
        {
            _entry = entry;
            _mediator = mediator;
            ParentGroup = parent;

            SaveCommand = new RelayCommand(() => _mediator.Send(new SaveDatabaseCommand()));
            GeneratePasswordCommand = new RelayCommand(async () => await GeneratePassword());
            UndoDeleteCommand = new RelayCommand(() => Move(PreviousGroup), () => PreviousGroup != null);
        }
        
        public async Task GeneratePassword()
        {
            Password = await _mediator.Send(new GeneratePasswordCommand
            {
                BracketsPatternSelected = BracketsPatternSelected,
                CustomChars = CustomChars,
                DigitsPatternSelected = DigitsPatternSelected,
                LowerCasePatternSelected = LowerCasePatternSelected,
                MinusPatternSelected = MinusPatternSelected,
                PasswordLength = (int)PasswordLength,
                SpacePatternSelected = SpacePatternSelected,
                SpecialPatternSelected = SpecialPatternSelected,
                UnderscorePatternSelected = UnderscorePatternSelected,
                UpperCasePatternSelected = UpperCasePatternSelected
            });
            OnPropertyChanged(nameof(IsRevealPasswordEnabled));
        }

        
        public Task MarkForDelete(string recycleBinTitle)
        {
            if (_database.RecycleBinEnabled && _database.RecycleBin?.IdUuid == null)
                _database.CreateRecycleBin(recycleBinTitle);
            Move(_database.RecycleBinEnabled && !ParentGroup.IsSelected ? _database.RecycleBin : null);
        }
        
        public void Move(GroupVm destination)
        {
            PreviousGroup = ParentGroup;
            PreviousGroup.Entries.Remove(this);
            if (destination == null)
            {
                _database.AddDeletedItem(IdUuid);
                return;
            }
            ParentGroup = destination;
            ParentGroup.Entries.Add(this);
        }
        
        public async Task CommitDelete()
        {
            await _mediator.Send(new DeleteEntryCommand {Entry = _entry});
        }
        
        public Application.Entry.Models.EntryVm GetEntry()
        {
            return _entry;
        }
        
        public override string ToString()
        {
            return IsSelected ? 
                _mediator.Send(new GetResourceQuery{Key = "EntryCurrent"}).GetAwaiter().GetResult() : 
                _entry.ModificationDate.ToString("g");
        }
    }
}