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

[RequireComponent(typeof(NPC))]
class NpcShopManager : MonoBehaviour
{
    [SerializeField]
    public List<IndexValuePair<SystemLanguageEnum, Dialogue>> DialogueTemplate;

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

    [SerializeField]
    public Shop shop;

    bool CanShopBeOpened = false;

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

        // 2. Init dialogue model
        CreateInstanceBasedOnLanguage();

        //this.RegisterShop();
        // 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 shop.Npc == gameObject.GetComponent<NPC>().name && shop.Map == SceneManager.GetActiveScene().name; 
            }).First();
    }

    public void Update()
    {
        /*
         * 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 (CanShopBeOpened && Input.GetKeyDown(ShopUIManager.Instance.keyToOpen) && Dialogue.DialogueSteps.First().DialogueController?.CurrentPanel == null && !ShopUIManager.Instance.GetPanelStatus())
        {
            // Open dialogue panel (Shop will be opened later)
            Dialogue.StartDialogue();
        }

    }

    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())
        {
            CanShopBeOpened = true;
        }
    }

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

        if (collision.gameObject.tag == "Player")
        {
            CanShopBeOpened = false;

            if (Dialogue.DialogueSteps.First().DialogueController?.CurrentPanel != null)
                Dialogue.BreakDialogueStep();


            CloseShop();
        }
    }

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

    public void RegisterShop()
    {
        // 1. Set owner name
        shop.Npc = gameObject.name;

        // 2. Create new Shop instance in scene registry list
        ((SceneShopDataManager)SceneShopDataManager.Instance)
            .RegisterShop(
                new Shop(
                    SceneManager.GetActiveScene().name,
                    gameObject.name,
                    shop.GetContent()
                )
            );
    }

    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();
    }

    public Dialogue DetectInstanceBasedOnLanguage()
    {
        /*if (!PlayerPrefs.HasKey("language"))
            throw new Exception("Language not setted !!!");*/

        switch(PlayerPrefs.GetString("language"))
        {
            case "English":
            {
                return DialogueTemplate.Where(template => template.Key == SystemLanguageEnum.English).First().Value;
            }
            case "Polish":
            {
                return DialogueTemplate.Where(template => template.Key == SystemLanguageEnum.Polish).First().Value;
            }
            default:
            {
                return DialogueTemplate.Where(template => template.Key == SystemLanguageEnum.Polish).First().Value;
            }
        }
    }
}