using System;
using FramedAnimator.Domain;
using UnityEngine;

namespace FramedAnimator {
	[RequireComponent(typeof(SpriteRenderer))]
	public class Animator : MonoBehaviour {
		[SerializeField] private new Animation animation;
		public string CurrentAnimation => animation.name;
		private SpriteRenderer _renderer;

		public event Action<string> OnAnimationEnd;
		private AnimatorModel _model;

		private void Awake() {
			_renderer = GetComponent<SpriteRenderer>();
			if(animation)
				_model = new AnimatorModel(animation.FrameRate, animation.FrameCount);
		}

		private void Update() {
			if (!animation)
				return;

			if (_model.RenderingFrame >= _model.FrameCount - 1)
				TryCallAnimationEnd();
			else
				UpdateAnimationFrame();
		}

		private void UpdateAnimationFrame() {
			_model.UpdateAnimationFrame(Time.deltaTime);
			_renderer.sprite = animation.GetFrame(_model.RenderingFrame);
		}

		private void TryCallAnimationEnd() {
			if(_model.AnimationEnded(Time.deltaTime))
				OnAnimationEnd?.Invoke(animation.name);
		}

		public void ChangeAnimation(Animation anim) {
			_model = new AnimatorModel(anim.FrameRate, anim.FrameCount);
			animation = anim;
			_renderer.sprite = animation.GetFrame(0);
		}

		public void PlayUntil(float fraction) {
			if (fraction >= 1f)
				_model.PlayToEnd = true;
			else
				_model.PlayUntil(fraction);
		}
	}
}