using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;

//TODO: make this system supprts tabs without using tab buttons
// or redo the entire thing
// yeah we need to redo the whole thing
// for now make your own page system

namespace Lemon.GenericLib.UI
{
    public class TabGroup : MonoBehaviour
    {
        [SerializeField] private List<TabSet> tabSets;
        [SerializeField] private int defaultTabIndex;


        private TabButtonScript selectedButton;

        [Serializable]
        struct TabSet
        {
            public TabButtonScript tabButton;
            public GameObject tabObject;

            public TabSet(TabButtonScript tabButton, GameObject tabObject)
            {
                this.tabButton = tabButton;
                this.tabObject = tabObject;
            }

            public override bool Equals(object obj)
            {
                return base.Equals(obj);
            }
        }

        private void Start()
        {
            if (tabSets == null || defaultTabIndex < 0 || defaultTabIndex > tabSets.Count)
            {
                Debug.LogError("default tab cannot be asisgned, pleace chect the default tab index and make sure the tab list is initialized");
            }
            else
            {
                OnTabSelected(tabSets[defaultTabIndex].tabButton);


            }
        }

        public void Subscribe(TabButtonScript button, GameObject tabObject)
        {
            if (tabSets == null)
            {
                tabSets = new List<TabSet>();
            }
            tabSets.Add(new TabSet(button, tabObject));
        }

        public void OnTabEnter(TabButtonScript button)
        {
            ResetTabs();
            if (selectedButton == null || button != selectedButton)
            {
                button.OnEnter();
            }

        }

        public void OnTabExit(TabButtonScript button)
        {
            ResetTabs();

        }

        public void OnTabSelected(TabButtonScript button)
        {
            if (selectedButton != null)
            {
                selectedButton.OnDeselected();
            }


            selectedButton = button;
            button.OnSelected();

            UpdateSelectedTab();
            ResetTabs();


        }


        public void ResetTabs()
        {
            foreach (var item in tabSets)
            {
                if (selectedButton != null && item.tabButton == selectedButton) { continue; }
                item.tabButton.OnExit();
            }
        }

        //can overwite this
        public void UpdateSelectedTab()
        {
            foreach (var tab in tabSets)
            {
                if (tab.tabButton == selectedButton)
                {
                    tab.tabObject.SetActive(true);
                    tab.tabObject.transform.SetSiblingIndex(tabSets.Count - 1);
                }
                else
                {
                    tab.tabObject.SetActive(false);
                    tab.tabObject.transform.SetSiblingIndex(0);
                }
            }
        }
    }
}