﻿/*
MIT License

Copyright(c) 2019 Mitchel Thompson
www.angryarugula.com

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Arugula.Animation;

namespace Arugula.UI
{
    public class Curtains : MonoBehaviour
    {
        public enum MotionType { None, Raising, Lowering }

        static Curtains instance;


        public static System.Action OnRaised = delegate { Motion = MotionType.None; };
        public static System.Action OnLowered = delegate { Motion = MotionType.None; };
        public static System.Action OnLowering = delegate { Motion = MotionType.Lowering; };
        public static System.Action OnRaising = delegate { Motion = MotionType.Raising; };

        public static MotionType Motion { get; private set; }
        public static float Speed = 1;

        public static ITween<float> Down(System.Action callback = null)
        {
            return instance._Down(callback);
        }

        public static ITween<float> Up(System.Action callback = null)
        {
            return instance._Up(callback);
        }

        public CanvasGroup group;
        public Tween.Options downTween;
        public Tween.Options upTween;
        public bool autoUp = true;

        ITween<float> tween;


        private void OnEnable()
        {
            if (instance != null && instance != this)
            {
                if (autoUp)
                    Up();
                Destroy(gameObject);
                return;
            }

            instance = this;
            DontDestroyOnLoad(gameObject);

            if (autoUp)
                Up();
        }

        private void OnDisable()
        {
            if (instance == this)
                instance = null;
        }

        ITween<float> _Down(System.Action callback)
        {
            if (Motion == MotionType.Lowering)
                throw new System.Exception("Curtains already lowering!");

            if (!group.gameObject.activeSelf)
                group.gameObject.SetActive(true);

            if (tween != null && !tween.Finished)
                tween.Finish(false);

            Tween.Options data = (Tween.Options)downTween.Clone();
            data.duration /= Speed;

            tween = group.alpha.To(1, data, context: this);
            tween.OnUpdatedValue += (x) => { group.alpha = x; AudioListener.volume = 1f - x; };
            if (callback != null)
                tween.OnFinished += (x) => callback();

            tween.OnFinished += (x) => { if (x) OnLowered(); };

            OnLowering();

            return tween;
        }

        ITween<float> _Up(System.Action callback)
        {
            if (Motion == MotionType.Raising)
                throw new System.Exception("Curtains already raising!");


            if (!group.gameObject.activeSelf)
                group.gameObject.SetActive(true);

            if (tween != null && !tween.Finished)
                tween.Finish(false);

            Tween.Options data = (Tween.Options)upTween.Clone();
            data.duration /= Speed;

            tween = group.alpha.To(0, data, context: this);
            tween.OnUpdatedValue += (x) => { group.alpha = x; AudioListener.volume = 1f - x; };
            if (callback != null)
                tween.OnFinished += (x) => callback();

            tween.OnFinished += (x) => { if (x) group.gameObject.SetActive(false); };
            tween.OnFinished += (x) => { if (x) OnRaised(); };

            OnRaising();

            return tween;
        }
    }

}
