using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DialogController : MonoBehaviour
{
    public List<DialogueMessage> dialogs = new List<DialogueMessage>();
    private Queue<DialogueMessage> dialogsQueue = new Queue<DialogueMessage>();
    public DialogueMessage currentDialogue { get; private set; }
    public bool dialogFinished { get { return dialogState == DialogState.Finished; }}
    public DialogState dialogState { get; private set; }

    public delegate void DialogCallback(DialogueMessage msg, DialogController controller);
    public static event DialogCallback dialogSkipped;
    public delegate void DialogStateCallback(DialogState state,DialogController controller);
    public static event DialogStateCallback dialogStateChanged;

    public enum DialogState
    {
        NotStated,
        Started,
        Finished
    }
    
    void Start()
    {
        Talk();
   
    }

    public void NextDialogue()
    {
        if (dialogsQueue.Count > 0)
        {
            DoDialogue(dialogsQueue.Dequeue());
        }
    }

    private void DoDialogue(DialogueMessage content)
    {
        TriggerStateChange(DialogState.Started);
        currentDialogue = content;

        TriggerNextDialog(content);

        if (dialogsQueue.Count == 0)
        {
            TriggerStateChange(DialogState.Finished);
        }


    }
 

    public void SayDialogue()
    {
        if (dialogsQueue.Count > 0)
        {
            DoDialogue(dialogsQueue.Peek());
        }
    }

    public void Talk()
    {
        dialogsQueue.Clear();
        if (dialogs.Count > 0)
        {
            for (int i = dialogs.Count - 1; i >= 0; i--)
            {
                dialogsQueue.Enqueue(dialogs[i]);
            }
        }
    }
    public static void Talk(DialogueMessage text)
    {
        if (dialogSkipped != null)
        {
            dialogSkipped(text, null);
        }
    }

    public void End()
    {
        dialogsQueue.Clear();
        TriggerStateChange(DialogState.Finished);
        currentDialogue = new DialogueMessage();

        if (dialogSkipped != null)
        {
            dialogSkipped(currentDialogue, this);
        }
    }

    void TriggerStateChange(DialogState newState)
    {
        if (dialogState != newState)
        {
            dialogState = newState;
            if (dialogStateChanged != null)
            {
                dialogStateChanged(newState, this);
            }
        }
    }

    void TriggerNextDialog(DialogueMessage txt)
    {
        if (dialogSkipped != null)
        {
            dialogSkipped(txt,this);
        }
    }
}