using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.Serialization;
using UnityEngine.UI;

namespace UIWidgets
{
	[AddComponentMenu("UI/Accordion", 350)]
	public class Accordion : MonoBehaviour
	{
		[FormerlySerializedAs("Items")]
		[SerializeField]
		protected List<AccordionItem> items = new List<AccordionItem>();

		[SerializeField]
		public bool OnlyOneOpen = true;

		[SerializeField]
		public bool Animate = true;

		[SerializeField]
		public float AnimationDuration = 0.5f;

		[SerializeField]
		public AccordionDirection Direction = AccordionDirection.Vertical;

		[SerializeField]
		public AccordionEvent OnToggleItem = new AccordionEvent();

		protected List<UnityAction> callbacks = new List<UnityAction>();

		public List<AccordionItem> Items
		{
			get
			{
				return items;
			}
			protected set
			{
				if (items != null)
				{
					RemoveCallbacks();
				}
				items = value;
				if (items != null)
				{
					AddCallbacks();
				}
			}
		}

		protected virtual void Start()
		{
			AddCallbacks();
			UpdateLayout();
		}

		protected virtual void AddCallback(AccordionItem item)
		{
			if (item.Open)
			{
				Open(item, false);
			}
			else
			{
				Close(item, false);
			}
			UnityAction unityAction = delegate
			{
				ToggleItem(item);
			};
			item.ToggleObject.AddComponent<AccordionItemComponent>().OnClick.AddListener(unityAction);
			item.ContentObjectRect = item.ContentObject.transform as RectTransform;
			item.ContentLayoutElement = item.ContentObject.GetComponent<LayoutElement>() ?? item.ContentObject.AddComponent<LayoutElement>();
			item.ContentObjectHeight = item.ContentObjectRect.rect.height;
			if (item.ContentObjectHeight == 0f)
			{
				item.ContentObjectHeight = item.ContentLayoutElement.preferredHeight;
			}
			item.ContentObjectWidth = item.ContentObjectRect.rect.width;
			if (item.ContentObjectWidth == 0f)
			{
				item.ContentObjectWidth = item.ContentLayoutElement.preferredWidth;
			}
			callbacks.Add(unityAction);
		}

		protected virtual void AddCallbacks()
		{
			Items.ForEach(AddCallback);
		}

		protected virtual void RemoveCallback(AccordionItem item, int index)
		{
			if (item != null && !(item.ToggleObject == null))
			{
				AccordionItemComponent component = item.ToggleObject.GetComponent<AccordionItemComponent>();
				if (component != null && index < callbacks.Count)
				{
					component.OnClick.RemoveListener(callbacks[index]);
				}
			}
		}

		protected virtual void RemoveCallbacks()
		{
			Items.ForEach(RemoveCallback);
			callbacks.Clear();
		}

		protected virtual void OnDestroy()
		{
			RemoveCallbacks();
		}

		public virtual void ToggleItem(AccordionItem item)
		{
			if (item.Open)
			{
				if (!OnlyOneOpen)
				{
					Close(item);
				}
				return;
			}
			if (OnlyOneOpen)
			{
				Items.Where(IsOpen).ForEach(Close);
			}
			Open(item);
		}

		public virtual void Open(AccordionItem item)
		{
			if (!item.Open)
			{
				if (OnlyOneOpen)
				{
					Items.Where(IsOpen).ForEach(Close);
				}
				Open(item, Animate);
			}
		}

		public virtual void Close(AccordionItem item)
		{
			if (item.Open)
			{
				Close(item, Animate);
			}
		}

		protected bool IsOpen(AccordionItem item)
		{
			return item.Open;
		}

		protected bool IsHorizontal()
		{
			return Direction == AccordionDirection.Horizontal;
		}

		protected virtual void Open(AccordionItem item, bool animate)
		{
			if (item.CurrentCorutine != null)
			{
				StopCoroutine(item.CurrentCorutine);
				if (IsHorizontal())
				{
					item.ContentObjectRect.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, item.ContentObjectWidth);
					item.ContentLayoutElement.preferredWidth = item.ContentObjectWidth;
				}
				else
				{
					item.ContentObjectRect.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, item.ContentObjectHeight);
					item.ContentLayoutElement.preferredHeight = item.ContentObjectHeight;
				}
				item.ContentObject.SetActive(false);
			}
			if (animate)
			{
				item.CurrentCorutine = StartCoroutine(OpenCorutine(item));
			}
			else
			{
				item.ContentObject.SetActive(true);
				OnToggleItem.Invoke(item);
			}
			item.ContentObject.SetActive(true);
			item.Open = true;
		}

		protected virtual void Close(AccordionItem item, bool animate)
		{
			if (item.CurrentCorutine != null)
			{
				StopCoroutine(item.CurrentCorutine);
				item.ContentObject.SetActive(true);
				if (IsHorizontal())
				{
					item.ContentObjectRect.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, item.ContentObjectWidth);
					item.ContentLayoutElement.preferredWidth = item.ContentObjectWidth;
				}
				else
				{
					item.ContentObjectRect.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, item.ContentObjectHeight);
					item.ContentLayoutElement.preferredHeight = item.ContentObjectHeight;
				}
			}
			if (item.ContentObjectRect != null)
			{
				item.ContentObjectHeight = item.ContentObjectRect.rect.height;
				item.ContentObjectWidth = item.ContentObjectRect.rect.width;
			}
			if (animate)
			{
				item.CurrentCorutine = StartCoroutine(HideCorutine(item));
				return;
			}
			item.ContentObject.SetActive(false);
			item.Open = false;
			OnToggleItem.Invoke(item);
		}

		protected virtual IEnumerator OpenCorutine(AccordionItem item)
		{
			item.ContentObject.SetActive(true);
			item.Open = true;
			yield return StartCoroutine(Animations.Open(item.ContentObjectRect, AnimationDuration, IsHorizontal()));
			UpdateLayout();
			OnToggleItem.Invoke(item);
		}

		protected void UpdateLayout()
		{
			Utilites.UpdateLayout(GetComponent<LayoutGroup>());
		}

		protected virtual IEnumerator HideCorutine(AccordionItem item)
		{
			yield return StartCoroutine(Animations.Collapse(item.ContentObjectRect, AnimationDuration, IsHorizontal()));
			item.Open = false;
			item.ContentObject.SetActive(false);
			UpdateLayout();
			OnToggleItem.Invoke(item);
		}
	}
}