using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using Sirenix.OdinInspector;
using KairoEngine.UI.InteractionHandler;

namespace KairoEngine.UI.Encyclopedia
{
    [HideMonoScript]
    public class EncyclopediaUi : MonoBehaviour
    {
        public EncyclopediaController controller;
        public GameObject menuGameObject;
        public GameObject subMenuGameObject;
        public GameObject viewsGameObject;
        public Transform menuContainer;
        public Transform subMenuContainer;
        public bool createOnStart = true;
        public bool showDebug = false;
        public List<EncyclopediaUiView> views;
        private List<SelectedButton> menuButtonSelection;
        private List<SelectedButton> subMenuButtonSelection;
        private int menuIndex = -1;
        private int subMenuIndex = -1;
        private int currentMenuIndex = -1;
        private int currentSubMenuIndex = -1;

        private void Start()
        {
            if(menuGameObject == null) Debug.LogError("Missing Menu GameObject in EncyclopediaUi", this.gameObject);
            if(subMenuGameObject == null) Debug.LogError("Missing submenu GameObject in EncyclopediaUi", this.gameObject);
            if(viewsGameObject == null) Debug.LogError("Missing views GameObject in EncyclopediaUi", this.gameObject);
            if(createOnStart) Populate();
        }

        private void Update()
        {
            
        }

        [Button("Show Submenu"), ButtonGroup("EditorActions")]
        public void ShowSubmenu() => subMenuGameObject.SetActive(true);

        [Button("Hide Submenu"), ButtonGroup("EditorActions")]
        public void HideSubmenu() => subMenuGameObject.SetActive(false);

        public void Populate()
        {
            if(showDebug) Debug.Log("Creating Encyclopedia UI Element");
            menuIndex = controller.menuIndex;
            subMenuIndex = controller.subMenuIndex;
            currentMenuIndex = controller.menuIndex;
            currentSubMenuIndex = controller.subMenuIndex;
            CreateMenu();
            CreateSubMenu();
            ShowArticle();
        }

        public void CreateMenu()
        {
            if(controller == null || menuContainer == null) return;
            menuButtonSelection = new List<SelectedButton>();
            int counter = 0;
            //if(showDebug) Debug.Log($"Destroying {oldButtons.Length} menu buttons");
            Button[] oldButtons = menuContainer.GetComponentsInChildren<Button>();
            foreach (Button item in oldButtons) DestroyImmediate(item.gameObject);
            foreach (EncyclopediaCategory category in controller.categories)
            {
                var obj = Instantiate(controller.categoryButtomPrefab, new Vector3(), Quaternion.identity, menuContainer.transform);
                var btnData = obj.GetComponent<ButtonData>();
                if(btnData != null) btnData.Setup(category.title, category.icon);
                var handler = obj.GetComponent<ClickHandler>();
                if(handler != null) handler.Setup(category.id, (IClickHandler)controller);
                var selectedButton = obj.GetComponent<SelectedButton>();
                if(selectedButton != null) menuButtonSelection.Add(selectedButton);
                var categoryDataViews = obj.GetComponentsInChildren<IEncyclopediaCategoryDataView>(true);
                if(categoryDataViews != null) foreach (var view in categoryDataViews) view.Setup(category);
                counter += 1;
            }
            if(menuIndex < menuButtonSelection.Count) 
            {
                //menuIndex = controller.menuIndex;
                menuButtonSelection[menuIndex].Select();
            }
            //if(showDebug) Debug.Log($"Created {counter} menu buttons");
        }

        public void CreateSubMenu()
        {
            if(controller == null || subMenuContainer == null) return;
            subMenuButtonSelection = new List<SelectedButton>();
            Button[] oldButtons = subMenuContainer.GetComponentsInChildren<Button>();
            int counter = 0;
            var category = controller.categories[controller.menuIndex];      
            var oldCategory = controller.categories[currentMenuIndex];
            category.UpdateArticles();
            Transform container;
            var layout = GetView(category.layoutName);
            ResetViews();
            if(category.showSubMenu)
            {
                container = subMenuContainer.transform;
                ShowSubmenu();
            } 
            else
            {
                currentMenuIndex = menuIndex;
                subMenuIndex = 0;
                currentSubMenuIndex = 0;
                container = layout.container;
                HideSubmenu(); 
            }
            layout.view.SetActive(true);
            //if(showDebug) Debug.Log($"Destroying {oldButtons.Length} sub menu buttons");
            foreach (Button item in oldButtons) DestroyImmediate(item.gameObject);
            foreach (EncyclopediaArticle article in category.GetArticles())
            {
                var obj = Instantiate(category.buttonPrefab, new Vector3(), Quaternion.identity, container);
                var btnData = obj.GetComponent<ButtonData>();
                Sprite icon = null;
                if(article.icon != null) icon = article.icon;
                else icon = category.icon;
                if(btnData != null) btnData.Setup(article.title, icon);
                var handler = obj.GetComponent<ClickHandler>();
                if(handler != null) handler.Setup(article.id, (IClickHandler)controller);
                var selectedButton = obj.GetComponent<SelectedButton>();
                if(selectedButton != null) subMenuButtonSelection.Add(selectedButton);
                var contentDataViews = obj.GetComponentsInChildren<IEncyclopediaArticleDataView>(true);
                foreach (var item in contentDataViews) item.Setup(article);
                if(article.unlocked == false)
                {
                    var btn = obj.GetComponent<Button>();
                    if(btn != null) btn.interactable = false;
                    if(selectedButton != null) selectedButton.isInteractable = false;
                }
                else if(selectedButton != null) selectedButton.isInteractable = true;
                counter += 1;
            }
            if(category.showSubMenu && !oldCategory.showSubMenu)
            {
                subMenuIndex = 0;
                controller.subMenuIndex = 0;
                subMenuButtonSelection[subMenuIndex].Select();
                ShowArticle();
            }
            if(controller.subMenuIndex < subMenuButtonSelection.Count && menuIndex == currentMenuIndex)
            {
                //subMenuIndex = controller.subMenuIndex;
                subMenuButtonSelection[subMenuIndex].Select();
            }
            //if(showDebug) Debug.Log($"Created {counter} sub menu buttons");
            
        }

        public void ShowArticle()
        {
            if(controller == null) return;
            var category = controller.categories[menuIndex];
            if(!category.showSubMenu) return;
            var articles = category.GetArticles();
            var article = articles[subMenuIndex];
            var layout = GetView(category.layoutName);
            if(layout == null) return;
            HideViews();
            layout.view.SetActive(true);
            var contentDataViews = layout.view.GetComponentsInChildren<IEncyclopediaArticleDataView>(true);
            foreach (var item in contentDataViews) item.Setup(article);
            foreach (var btn in subMenuButtonSelection) btn.Deselect();
            subMenuButtonSelection[subMenuIndex].Select();
            currentMenuIndex = menuIndex;
            currentSubMenuIndex = subMenuIndex;
        }

        public void Navigate()
        {
            if(controller == null) return;
            // Navigated to different category
            if(menuIndex != controller.menuIndex)
            {
                menuIndex = controller.menuIndex;
                CreateMenu();
                CreateSubMenu();
            }
            else if (currentMenuIndex != menuIndex && currentSubMenuIndex == subMenuIndex)
            {
                if(controller.subMenuIndex > controller.categories[menuIndex].GetArticles().Count) return;
                else subMenuIndex = controller.subMenuIndex;
                ShowArticle();
            }
            if(subMenuIndex != controller.subMenuIndex)
            {
                if(controller.subMenuIndex > controller.categories[menuIndex].GetArticles().Count) return;
                else subMenuIndex = controller.subMenuIndex;
                ShowArticle();
            }
        }

        public EncyclopediaUiView GetView(string title)
        {
            for (int i = 0; i < views.Count; i++)
            {
                if(views[i].title == title) return views[i];
            }
            return null;
        }

        public void HideViews()
        {
            foreach (var layout in views) layout.view.SetActive(false);
        }

        public void ResetViews()
        {
            HideViews();
            foreach (var view in views)
            {
                if(view.container != null)
                {
                    Transform[] oldListElements = view.container.GetComponentsInChildren<Transform>(true);
                    foreach (Transform item in oldListElements) 
                        if(item != view.container && item != null) DestroyImmediate(item.gameObject);
                }
            }
            
        }

        [System.Serializable]
        public class EncyclopediaUiView
        {
            [HorizontalGroup("Line", 0.4f), HideLabel] public string title;
            [HorizontalGroup("Line", 0.3f), HideLabel] public GameObject view;
            [HorizontalGroup("Line", 0.3f), HideLabel] public Transform container;
        }
    }
}