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

namespace UIWidgets
{
	[AddComponentMenu("UI/Tabs", 290)]
	public class Tabs : MonoBehaviour
	{
		[SerializeField]
		public Transform Container;

		[SerializeField]
		public Button DefaultTabButton;

		[SerializeField]
		public Button ActiveTabButton;

		[SerializeField]
		private Tab[] tabObjects = new Tab[0];

		public int selectedIndex;

		[Tooltip("If true does not deactivate hidden tabs.")]
		[SerializeField]
		public bool KeepTabsActive;

		[SerializeField]
		public TabSelectEvent OnTabSelect = new TabSelectEvent();

		public List<Button> defaultButtons = new List<Button>();

		public List<Button> activeButtons = new List<Button>();

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

		public Tab[] TabObjects
		{
			get
			{
				return tabObjects;
			}
			set
			{
				tabObjects = value;
				UpdateButtons();
			}
		}

		public Tab SelectedTab { get; protected set; }

		public void Initialize()
		{
			if (Container == null)
			{
				throw new NullReferenceException("Container is null. Set object of type GameObject to Container.");
			}
			if (DefaultTabButton == null)
			{
				throw new NullReferenceException("DefaultTabButton is null. Set object of type GameObject to DefaultTabButton.");
			}
			if (ActiveTabButton == null)
			{
				throw new NullReferenceException("ActiveTabButton is null. Set object of type GameObject to ActiveTabButton.");
			}
			DefaultTabButton.gameObject.SetActive(false);
			ActiveTabButton.gameObject.SetActive(false);
			UpdateButtons();
		}

		private void UpdateButtons()
		{
			if (tabObjects.Length == 0)
			{
				throw new ArgumentException("TabObjects array is empty. Fill it.");
			}
			RemoveCallbacks();
			CreateButtons();
			AddCallbacks();
			SelectTab(tabObjects[0].Name);
		}

		private void AddCallback(Tab tab, int index)
		{
			string tabName = tab.Name;
			UnityAction item = delegate
			{
				SelectTab(tabName);
			};
			callbacks.Add(item);
			defaultButtons[index].onClick.AddListener(callbacks[index]);
		}

		private void AddCallbacks()
		{
			tabObjects.ForEach(AddCallback);
		}

		private void RemoveCallback(Tab tab, int index)
		{
			if (tab != null && index < callbacks.Count)
			{
				defaultButtons[index].onClick.RemoveListener(callbacks[index]);
			}
		}

		private void RemoveCallbacks()
		{
			if (callbacks.Count > 0)
			{
				tabObjects.ForEach(RemoveCallback);
				callbacks.Clear();
			}
		}

		private void OnDestroy()
		{
			RemoveCallbacks();
		}

		public void SelectTab(string tabName, bool onDemand = false)
		{
			int num = Array.FindIndex(tabObjects, (Tab x) => x.Name == tabName);
			if (num == -1)
			{
				throw new ArgumentException(string.Format("Tab with name \"{0}\" not found.", tabName));
			}
			if (onDemand)
			{
				if (num == selectedIndex)
				{
					return;
				}
			}
			else
			{
				EquipmentGUI equipmentGUI = UnityEngine.Object.FindObjectOfType<EquipmentGUI>();
				if ((bool)equipmentGUI)
				{
					equipmentGUI.DeselectedEquipment();
					equipmentGUI.RefreshAll();
				}
			}
			if (KeepTabsActive)
			{
				tabObjects[num].TabObject.transform.SetAsLastSibling();
			}
			else
			{
				tabObjects.ForEach(DeactivateTab);
				tabObjects[num].TabObject.SetActive(true);
			}
			defaultButtons.ForEach(ActivateButton);
			defaultButtons[num].gameObject.SetActive(false);
			activeButtons.ForEach(DeactivateButton);
			activeButtons[num].gameObject.SetActive(true);
			SelectedTab = tabObjects[num];
			OnTabSelect.Invoke(num);
			selectedIndex = num;
		}

		private void DeactivateTab(Tab tab)
		{
			tab.TabObject.SetActive(false);
		}

		private void ActivateButton(Button button)
		{
			button.gameObject.SetActive(true);
		}

		private void DeactivateButton(Button button)
		{
			button.gameObject.SetActive(false);
		}

		private void CreateButtons()
		{
			if (tabObjects.Length > defaultButtons.Count)
			{
				for (int i = defaultButtons.Count; i < tabObjects.Length; i++)
				{
					Button button = UnityEngine.Object.Instantiate(DefaultTabButton);
					button.transform.SetParent(Container, false);
					defaultButtons.Add(button);
					Button button2 = UnityEngine.Object.Instantiate(ActiveTabButton);
					button2.transform.SetParent(Container, false);
					activeButtons.Add(button2);
				}
			}
			if (tabObjects.Length < defaultButtons.Count)
			{
				for (int num = defaultButtons.Count; num > tabObjects.Length; num--)
				{
					UnityEngine.Object.Destroy(defaultButtons[num]);
					UnityEngine.Object.Destroy(activeButtons[num]);
					defaultButtons.RemoveAt(num);
					activeButtons.RemoveAt(num);
				}
			}
			defaultButtons.ForEach(SetButtonName);
			activeButtons.ForEach(SetButtonName);
		}

		private void SetButtonName(Button button, int index)
		{
			button.gameObject.SetActive(true);
			Text componentInChildren = button.GetComponentInChildren<Text>();
			if ((bool)componentInChildren)
			{
			}
			button.GetComponent<MyTabButton>().iconImage.sprite = tabObjects[index].Icon;
		}
	}
}