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

[RequireComponent(typeof(NPC))]
public class NpcDialogueManager : MonoBehaviour
{
    [SerializeField]
    public string SpeakerName;

    [SerializeField]
    public LanguageDetector<MultiDialogue> languageDetector;

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

    // List<Key<dialogue No, dialogue step No>, Value : UnityEvent>
    public List<IndexValuePair<IndexValuePair<int, int>, UnityEvent>> EndactionEventList;

    [SerializeField] public KeyCode keyToOpen = KeyCode.E;

    public bool CanBeOpened = false;

    /// <summary>
    /// This flag tell that manager will open dialogue automatically after
    /// - beeing in collision range
    /// - when dialogue is closed
    /// - when Player press KeyToOpen button
    /// 
    /// Change var status in other sctipt if you want to use other triggers to open dialogue
    /// </summary>
    public bool OpenInDefaultWay = true;

    public void Start()
    {
        Dialogue = Instantiate(languageDetector.DetectInstanceBasedOnLanguage());
        Dialogue.SetSpeakerName(SpeakerName);

        Dialogue.Dialogues.ForEach(dial => dial.Value.SetActionAfterDialogueStep(dial.Key, dial.Value.ResetDialogue));  // reset dial 
    }

    public void Update() 
    {
        if(OpenInDefaultWay && CanBeOpened && !GetCurrentDialoguePanelStatus() && Input.GetKeyDown(keyToOpen))
            gameObject.GetComponent<NpcDialogueManager>().Dialogue.StartDialogue();
    }

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

        if (collision.gameObject.tag == "Player")
            CheckIfCanBeOpen();
    }


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

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

    /// <summary>
    /// Opened = 1
    /// Closed = 0
    /// </summary>
    /// <returns></returns>
    public bool GetCurrentDialoguePanelStatus()
    {
        var multiDialStatius = Dialogue.DialogueStepStatus();

        return Dialogue
            .Dialogues
            .Where(dialogue => dialogue.Key == multiDialStatius.Item1)
            .First()
            .Value
            .DialogueSteps[multiDialStatius.Item2].DialogueController.CurrentPanel != null;
    }

    public void CheckIfCanBeOpen()
    {
        /*
         * Conditions:
         * - agent in collision must be player
         * - npc bust me in Talking mode
         * - panel assigned to next sentence in dialogue must be closed 
         */
        if(gameObject.GetComponent<NPC>().State == NPCStateEnum.Talking && !GetCurrentDialoguePanelStatus())
        {
            CanBeOpened = true;
        }
    }

    /// <summary>
    /// Function to invoke actions declared in manager on object from scene not onto asset
    /// 
    /// Used in Dialogue ScriptableObject Template
    /// </summary>
    /// <param name="dialogueIndex"></param>
    public void DialogueEndAction(int dialogueIndex)
    {
        GameObject.FindObjectsOfType<NpcDialogueManager>().Where(obj => obj.name == gameObject.name).First().GetComponent<NpcDialogueManager>().InvokeDialogueEndAction(dialogueIndex);
    }

    /// <summary>
    /// Function to invoke actions declared in manager (on current object)
    /// 
    /// Use this to invoke actions which we want to occured after specific Dialogue
    /// </summary>
    /// <param name="dialogueIndex"></param>
    protected void InvokeDialogueEndAction(int dialogueIndex)
    {
        EndactionEventList.Where(el => el.Key.Key == dialogueIndex).ToList().ForEach(el => el.Value.Invoke());
    }

    /// <summary>
    /// Function to invoke actions declared in manager on object from scene not onto asset
    /// 
    /// Used in Dialogue ScriptableObject Template
    /// </summary>
    public void StepEndAction()
    {
        GameObject.FindObjectsOfType<NpcDialogueManager>().Where(obj => obj.name == gameObject.name).First().GetComponent<NpcDialogueManager>().InvokeStepEndAction();
    }

    /// <summary>
    /// Function to invoke actions declared in manager (on current object)
    /// 
    /// Use this to invoke actions which we want to occured after specific Dialogue Step
    /// </summary>
    protected void InvokeStepEndAction()
    {
        var dialogueProgress = Dialogue.DialogueStepStatus();

        EndactionEventList.Where(el => el.Key.Key == dialogueProgress.Item1 & el.Key.Value == dialogueProgress.Item2).ToList().ForEach(el => el.Value.Invoke());
    }
}