using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.SceneManagement;

[RequireComponent(typeof(NPC))]
[RequireComponent(typeof(NpcDialogueManager))]
public class NpcShopManager : MonoBehaviour
{
    [SerializeField]
    public LanguageDetector<Dialogue> languageDetector;

    /* We user object CLONED TO PREVENT overwritting changes in main object inassets */
    public Dialogue Dialogue;

    [SerializeField]
    public ShopBuildModel shopModel;

    [NonSerialized]
    public Shop shop;

    bool CanShopBeOpened = false;

    bool IsRegistered = false;

    public void Awake()
    {
        gameObject.GetComponent<NpcDialogueManager>().OpenInDefaultWay = false;
    }

    public virtual void Start()
    {
        // 1. Set npc state to trading
        gameObject.GetComponent<NPC>().State = NPCStateEnum.Trading;

        // 2. Init dialogue model
        CreateInstanceBasedOnLanguage();
    }

    public void Update()
    {
        if(!IsRegistered)
        {
            // if its new game or we dont have any save from this map - use deffault shop settings / content
            // else overwrite value by saved one
            if (OnMapAppearanceMethod.GameStatus == GameStatus.NewGame ||
                (OnMapAppearanceMethod.Gateway != OnMapAppearanceMethodEnum.NewGame || ShopUIManager.Instance.GetList().Count == 0)
            ) {
                // 0. Register shop in scene shop manager
                this.RegisterShop();
                //ShopUIManager.Instance.Add(shop);
            }
            else
                shop = ShopUIManager.Instance.GetList().Where(shop => {
                    return shopModel.ShopName == gameObject.GetComponent<NPC>().name && shop.Map == SceneManager.GetActiveScene().name;
                }).First();

            IsRegistered = true;
        }
        /*
         * Conditions:
         * - player must be in range of shopping
         * - user must press specific keyboard button
         * - dialogue panel must be closed
         * - shop panel must be closed
         */
        if (gameObject.GetComponent<NpcDialogueManager>().CanBeOpened && Input.GetKeyDown(ShopUIManager.Instance.keyToOpen) && !ShopUIManager.Instance.GetPanelStatus())
        {
            CreateInstanceBasedOnLanguage();

            // Open dialogue panel (Shop will be opened later)
            Dialogue.StartDialogue();

            // TODO pass dialogue to npocDialManager and invoke from there
        }

    }

    public void OnTriggerEnter2D(Collider2D collision)
    {
        // don't listen when component is disabled
        if (!gameObject.GetComponent<NpcShopManager>().enabled)
            return;

        /*
         * Conditions:
         * - agent in collision must be player
         * - npc bust me in Trading mode
         * - shop must be currently closed
         */
        if (collision.gameObject.tag == "Player" && gameObject.GetComponent<NPC>().State == NPCStateEnum.Trading && !ShopUIManager.Instance.GetPanelStatus())
        {
            gameObject.GetComponent<NpcDialogueManager>().CanBeOpened = true;
        }
    }

    public void OnTriggerExit2D(Collider2D collision)
    {
        // don't listen when component is disabled
        if (!gameObject.GetComponent<NpcShopManager>().enabled)
            return;

        if (collision.gameObject.tag == "Player")
        {
            if (Dialogue.DialogueSteps.First().DialogueController?.CurrentPanel != null)
                Dialogue.BreakDialogueStep();

            gameObject.GetComponent<NpcDialogueManager>().CanBeOpened = false;

            CloseShop();
        }
    }

    public void CreateInstanceBasedOnLanguage()
    {
        Dialogue = Instantiate(languageDetector.DetectInstanceBasedOnLanguage());
        Dialogue.SetSpeakerName(gameObject.GetComponent<NPC>().name);
        Dialogue.SetActionAfterDialogueStep(0, Dialogue.ResetDialogue);
        Dialogue.SetActionAfterDialogueStep(0, OpenShop);
    }

    public void RegisterShop()
    {
        // 1. Set owner name
        shopModel.ShopName = gameObject.GetComponent<NPC>().Name;

        // 2. Create new Shop instance in scene registry list
        ((SceneShopDataManager)SceneShopDataManager.Instance)
            .RegisterShop(
                shopModel.MapBuildModelToShop()
            );

        Debug.Log($"Shop {shopModel.ShopName} registered");
    }

    public void OpenShop()
    {
        if (EquipmentUIManager.Instance.GetPanelStatus()) EquipmentUIManager.Instance.ClosePanel();


        // Set info about current shop in shop UI manager (and wait for event - pressing E)

        // Open shopa action - invoked as dialogue end action
        ShopUIManager.Instance.CurrentShopOwnerName = gameObject.GetComponent<NPC>().name;
        ShopUIManager.Instance.OpenPanel();

    }

    public void CloseShop()
    {
        ShopUIManager.Instance.CurrentShopOwnerName = "";

        ShopUIManager.Instance.ClosePanel();
    }
}