using System;
using Artemis.Core.Models.Profile;
using Artemis.Core.Services.Storage.Interfaces;
using Artemis.UI.Services.Interfaces;

namespace Artemis.UI.Services
{
    public class ProfileEditorService : IProfileEditorService
    {
        private readonly IProfileService _profileService;
        private TimeSpan _currentTime;
        private TimeSpan _lastUpdateTime;

        public ProfileEditorService(IProfileService profileService)
        {
            _profileService = profileService;
        }

        public Profile SelectedProfile { get; private set; }
        public ProfileElement SelectedProfileElement { get; private set; }

        public TimeSpan CurrentTime
        {
            get => _currentTime;
            set
            {
                if (_currentTime.Equals(value))
                    return;
                _currentTime = value;
                UpdateProfilePreview();
                OnCurrentTimeChanged();
            }
        }

        public void ChangeSelectedProfile(Profile profile)
        {
            SelectedProfile = profile;
            UpdateProfilePreview();
            OnSelectedProfileChanged();
        }

        public void UpdateSelectedProfile()
        {
            _profileService.UpdateProfile(SelectedProfile, false);
            UpdateProfilePreview();
            OnSelectedProfileElementUpdated();
        }

        public void ChangeSelectedProfileElement(ProfileElement profileElement)
        {
            SelectedProfileElement = profileElement;
            OnSelectedProfileElementChanged();
        }

        public void UpdateSelectedProfileElement()
        {
            _profileService.UpdateProfile(SelectedProfile, true);
            UpdateProfilePreview();
            OnSelectedProfileElementUpdated();
        }


        private void UpdateProfilePreview()
        {
            if (SelectedProfile == null)
                return;
            var delta = CurrentTime - _lastUpdateTime;
            foreach (var layer in SelectedProfile.GetAllLayers())
            {
                // Override keyframe progress
                foreach (var baseLayerProperty in layer.Properties)
                    baseLayerProperty.KeyframeEngine?.OverrideProgress(CurrentTime);

                // Force layer shape to redraw
                layer.LayerShape?.CalculateRenderProperties(layer.PositionProperty.GetCurrentValue(), layer.SizeProperty.GetCurrentValue());
                // Update the brush with the delta (which can now be negative ^^)
                layer.Update(delta.TotalSeconds);
            }

            _lastUpdateTime = CurrentTime;
        }

        public event EventHandler SelectedProfileChanged;
        public event EventHandler SelectedProfileUpdated;
        public event EventHandler SelectedProfileElementChanged;
        public event EventHandler SelectedProfileElementUpdated;
        public event EventHandler CurrentTimeChanged;

        protected virtual void OnSelectedProfileElementUpdated()
        {
            SelectedProfileElementUpdated?.Invoke(this, EventArgs.Empty);
        }

        protected virtual void OnSelectedProfileElementChanged()
        {
            SelectedProfileElementChanged?.Invoke(this, EventArgs.Empty);
        }

        protected virtual void OnSelectedProfileUpdated()
        {
            SelectedProfileUpdated?.Invoke(this, EventArgs.Empty);
        }

        protected virtual void OnSelectedProfileChanged()
        {
            SelectedProfileChanged?.Invoke(this, EventArgs.Empty);
        }

        protected virtual void OnCurrentTimeChanged()
        {
            CurrentTimeChanged?.Invoke(this, EventArgs.Empty);
        }
    }
}