using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
using System.Collections.ObjectModel;

namespace AiwazAnimator
{
    public class AnimationManager : INotifyPropertyChanged
    {
        private float _currentTime;
        public float CurrentTime
        {
            get { return _currentTime; }
            set
            {
                _currentTime = value;
                OnPropertyChanged("CurrentTime");
            }
        }

        private bool _animating;
        public bool Animating
        {
            get { return _animating; }
            set
            {
                _animating = value;
                OnPropertyChanged("Animating");
            }
        }

        public ObservableCollection<Animation> Animations { get; set; }

        public AnimationManager()
        {
            _animating = false;
            _currentTime = 0.0f;
            Animations = new ObservableCollection<Animation>();
            Animations.CollectionChanged += new System.Collections.Specialized.NotifyCollectionChangedEventHandler((o, e) =>
            {
                OnPropertyChanged("Animations");
            });
        }

        public void Start()
        {
            Animating = true;
        }

        public void Stop()
        {
            CurrentTime = 0.0f;
            Animating = false;
        }

        public void Animate(float DeltaTime)
        {
            if (!Animating)
                return;

            CurrentTime += DeltaTime;
            foreach (Animation a in Animations)
            {
                a.Animate(CurrentTime);
            }
        }

        protected virtual void OnPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }

        public event PropertyChangedEventHandler PropertyChanged;
    }
}