using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using KairoEngine.Core;
using Sirenix.OdinInspector;
using KairoEngine.UI;
using KairoEngine.StorySystem;

namespace KairoEngine.StorySystem.UI
{
    [HideMonoScript]
    public class StoryViewUI : SerializedMonoBehaviour, IUiSystemElement
    {
        public string storyName = "Storyline";

        public Transform panel;
        
        [BoxGroup("Story Lines")]public bool showLines = false;
        [BoxGroup("Story Lines")] public bool skipEmptyLines = true;
        [BoxGroup("Story Lines"), ShowIf("@showLines")] public bool showMultipleLines = true;
        [BoxGroup("Story Lines"), ShowIf("@showLines && showMultipleLines")] public bool destroyLinesAfterPath = true;
        [BoxGroup("Story Lines"), ShowIf("@showLines && showMultipleLines")] public GameObject storyLinePrefab;
        [BoxGroup("Story Lines"), ShowIf("@showLines && showMultipleLines")] public Transform lineContainer;
        [BoxGroup("Story Lines"), ShowIf("@showLines && !showMultipleLines")] public StoryViewText lineText;
        [BoxGroup("Story Lines"), ShowIf("@showLines && showMultipleLines")] public ScrollRect scrollRect = null;

        [BoxGroup("Story Branches")] public bool showBranches = true;
        [BoxGroup("Story Branches"), ShowIf("@showBranches")] public bool hidePanelAfterChoice = true;
        [BoxGroup("Story Branches"), ShowIf("@showBranches")] public GameObject storyBranchPrefab;
        [BoxGroup("Story Branches"), ShowIf("@showBranches")] public Transform branchContainer;
        [BoxGroup("Story Branches"), ShowIf("@showBranches")] public int prePopulateButtons = 0;

        [BoxGroup("Portraits")] public bool usePortraits = false;
        [BoxGroup("Portraits"), ShowIf("@usePortraits")] public Image portraitImage;
        [BoxGroup("Portraits"), ShowIf("@usePortraits")] public GameObject portraitContainer;

        [BoxGroup("Portraits"), ShowInInspector, PropertySpace(4,2), ShowIf("@usePortraits")] 
        public Dictionary<string, Sprite> portraits = new Dictionary<string, Sprite>();

        private List<GameObject> buttons;
        private StoryStepData lastBranch;

        private List<GameObject> lines = new List<GameObject>();

        private bool isVisible = false;

        void Awake()
        {
            // Test if all variables are present
            if(panel == null) Debug.LogError("Panel is missing in StoryViewUI", this.gameObject);
            if(showLines && storyLinePrefab == null) Debug.LogError("StoryViewUI is missing a Story line Prefab", this.gameObject);
            if(showLines && lineContainer == null) Debug.LogError("StoryViewUI is missing a Story line Container", this.gameObject);
            if(showBranches && storyBranchPrefab == null) Debug.LogError("StoryViewUI is missing a Story Branch Prefab", this.gameObject);
            if(showBranches && branchContainer == null) Debug.LogError("StoryViewUI is missing a Story Branch Container", this.gameObject);
        }

        void Start()
        {
            if(buttons != null)
            {
                for (int i = 0; i < buttons.Count; i++) Destroy(buttons[i]);
                buttons.Clear();
            }
            else buttons = new List<GameObject>();
            //GameObject[] oldButtons = null;
            //if(branchContainer != null) oldButtons = branchContainer.gameObject.GetComponentsInChildren<GameObject>();
            // if(oldButtons != null)
            // {
            //     for (int i = 0; i < oldButtons.Length; i++) Destroy(oldButtons[i]);
            // }
            for (int i = 0; i < prePopulateButtons; i++)
            {
                GameObject obj = Instantiate(storyBranchPrefab, branchContainer);
                obj.name = obj.name.Replace("(Clone)", "");
                obj.SetActive(false);
                buttons.Add(obj);
            }
        }

        void OnEnable()
        {
            EventManager.broadcast.StartListening(storyName, OnStoryStep);
            UiManager.RegisterElement("StoryView", this, this.transform, isVisible);
        }

        void OnDisable()
        {
            EventManager.broadcast.StopListening(storyName, OnStoryStep);
            UiManager.UnregisterElement(this);
        }

        private void OnStoryStep(StoryStepData storyStep)
        {
            if(skipEmptyLines)
            {
                if(storyStep.text == "" && storyStep.branches == null) return;
            }
            switch (storyStep.category)
            {
                case StoryStepType.Line:
                    if(showLines) ShowStoryLine(storyStep);
                    break;
                case StoryStepType.Branch:
                    if(showBranches) ShowStoryBranch(storyStep);
                    break;
                case StoryStepType.Path:
                    ShowStoryPath(storyStep);
                    break;
                default:
                    break;
            }
        }
        private void ShowStoryLine(StoryStepData storyStep)
        {
            if(showLines == false) return;
            ShowPanel();
            if(showMultipleLines)
            {
                GameObject obj = Instantiate(storyLinePrefab, lineContainer);
                obj.name = obj.name.Replace("(Clone)", "");
                StoryViewText line = obj.GetComponent<StoryViewText>();
                line.Setup(storyStep);
                lines.Add(obj);
                StartCoroutine(AutoScroll());
            }
            else lineText.Setup(storyStep);
            if(usePortraits) ShowPortrait(storyStep);
        }

        private void ShowStoryBranch(StoryStepData storyStep)
        {
            if(buttons != null)
            {
                for (int i = 0; i < buttons.Count; i++) 
                {
                    //Destroy(buttons[i]);
                    buttons[i].SetActive(false);
                }
            }
            buttons = new List<GameObject>();
            ShowPanel();
            for (int i = 0; i < storyStep.branches.Count; i++)
            {
                GameObject obj;
                if(buttons.Count > i) 
                {
                    obj = buttons[i];
                    obj.SetActive(true);
                }
                else 
                {
                    obj = Instantiate(storyBranchPrefab, branchContainer);
                    obj.name = obj.name.Replace("(Clone)", "");
                }
                StoryViewButton btn = obj.GetComponent<StoryViewButton>();
                btn.Init(storyName, storyStep, i, this);
                buttons.Add(obj);
                StartCoroutine(AutoScroll());
            }
            lastBranch = storyStep;
        }

        private void ShowStoryPath(StoryStepData storyStep)
        {
            if(lastBranch == null) return;
            if(hidePanelAfterChoice) Hide();
            foreach (var btn in buttons) Destroy(btn);
            buttons = new List<GameObject>();
            lastBranch = null;
            if(destroyLinesAfterPath) foreach (var line in lines) Destroy(line);
        }

        private void ShowPortrait(StoryStepData storyStep)
        {
            var s = storyStep.text;
            var name = s.IndexOf(" ") > -1 
                            ? s.Substring(0,s.IndexOf(" "))
                            : s;
            if (name.EndsWith(":"))
            {
                name = name.Remove(name.Length - 1, 1);
                foreach(KeyValuePair<string, Sprite> keyValue in portraits)
                {
                    string key = keyValue.Key;
                    if(key == name)
                    {
                        Sprite sprite = keyValue.Value;
                        portraitImage.sprite = sprite;
                        portraitContainer.SetActive(true);
                        return;
                    }
                    
                }
            }
            portraitContainer.SetActive(false);
        }

        public void ButtonClicked(StoryStepData storyStep)
        {
            //Debug.Log("Button clicked");
            if(hidePanelAfterChoice) UiManager.HideElement(this);
        }

        public void Show()
        {
            isVisible = true;
            ShowPanel();
        }

        public void Hide()
        {
            isVisible = false;
            panel.gameObject.SetActive(false);
        }

        public bool IsVisible() => isVisible;

        private void ShowPanel()
        {

            if(isVisible) panel.gameObject.SetActive(true);
        }

        private IEnumerator AutoScroll()
        {
            if(lineContainer != null)
                LayoutRebuilder.ForceRebuildLayoutImmediate(lineContainer.GetComponent<RectTransform>());
            yield return new WaitForEndOfFrame();
            yield return new WaitForEndOfFrame();
            if(scrollRect != null) scrollRect.verticalNormalizedPosition = 0;
        }

    }
}