using UnityEngine;
using Unheimlich.Features.Dialogue.Data;
using Unheimlich.Features.Dialogue;
using Unheimlich.Features.Dialogue.UI;
using Unheimlich.Core.Events;

namespace Unheimlich.Features.Dialogue
{
    /// <summary>
    /// Trigger zone that starts a dialogue sequence when player enters.
    /// Supports pause/resume on exit/enter and optional one-time triggering.
    /// </summary>
    public class DialogueTriggerZone : TriggerZoneBase
    {
    [Header("Dialogue Reference")]
    [Tooltip("DialogueConversation to use for this trigger zone")]
    [SerializeField] private DialogueConversation _conversation;

    [Header("Trigger Settings")]
    [Tooltip("Can the dialogue be retriggered after completion")]
    [SerializeField] private bool _isRetriggerable = false;

    protected override bool IsRetriggerable => _isRetriggerable;
    
    [Header("Distance Check")]
    [Tooltip("Pause dialogue if player exits the trigger zone")]
    [SerializeField] private bool _pauseOnExit = true;

    [Header("Floating Word Anchor")]
    [SerializeField] private Transform _floatingWordAnchor;
    
    [Header("Animation Settings")]
    [SerializeField] private DialogueAnimationSettings _animationSettings;
    
    [Header("UI Reference")]
    [Tooltip("Local DialogueUI for this trigger zone. Uses DialogueManager's UI if null")]
    [SerializeField] private DialogueUI _localDialogueUI;

    [Header("Blur Effect")]
    [Tooltip("Enable blur effect when dialogue starts")]
    [SerializeField] private bool _enableBlurEffect = true;

    private bool _hasTriggered = false;
    private DialogueStateHandler _dialogueState;

    protected override void Awake()
    {
        base.Awake();
        _dialogueState = new DialogueStateHandler(this);

        if (_floatingWordAnchor == null)
            _floatingWordAnchor = transform;
    }

    protected override void OnPlayerEntered(Collider playerCollider)
    {
        if (_dialogueState.IsCompleted && !_isRetriggerable)
            return;
        
        if (_dialogueState.HasPausedDialogue)
        {
            _dialogueState.ResumeDialogue();
        }
        else if (!_hasTriggered || (_isRetriggerable && _dialogueState.IsCompleted))
        {
            TriggerDialogue();
        }
    }

    protected override void OnPlayerExited(Collider playerCollider)
    {
        if (_pauseOnExit && DialogueManager.Instance != null && DialogueManager.Instance.IsDialogueActive)
        {
            if ((Object)DialogueManager.Instance.CurrentOwner == this)
                _dialogueState.PauseDialogue();
        }
    }

    private void TriggerDialogue()
    {
        if (DialogueManager.Instance == null)
        {
            Debug.LogError("DialogueManager not found in scene!", this);
            return;
        }

        if (_conversation == null)
        {
            Debug.LogError($"{gameObject.name}: No conversation assigned!", this);
            return;
        }

        _hasTriggered = true;

        DialogueManager.Instance.StartConversation(
            _conversation,
            _floatingWordAnchor,
            _animationSettings,
            _localDialogueUI,
            this,
            _enableBlurEffect
        );

        DialogueManager.Instance.OnDialogueCompleted += OnDialogueCompleted;
    }

    private void OnDialogueCompleted(object owner)
    {
        if ((Object)owner == this)
        {
            _dialogueState.MarkAsCompleted();
            
            if (_isRetriggerable)
            {
                _hasTriggered = false;
                _dialogueState.AllowRetrigger();
            }
        }
        
        if (DialogueManager.Instance != null)
            DialogueManager.Instance.OnDialogueCompleted -= OnDialogueCompleted;
    }

    public void ResetTrigger()
    {
        _hasTriggered = false;
        _dialogueState.Reset();
        ResetZone();
    }

    private void OnDestroy()
    {
        if (DialogueManager.Instance != null)
            DialogueManager.Instance.OnDialogueCompleted -= OnDialogueCompleted;
    }

    private void OnValidate()
    {
        if (_localDialogueUI == null)
            Debug.LogWarning($"[DialogueTriggerZone] '{gameObject.name}' has no Local Dialogue UI assigned. Assign the appropriate DialogueUI prefab variant (World, NPC, Room, Screen, etc.).", this);
    }

    private void OnDrawGizmosSelected()
    {
        if (_floatingWordAnchor != null)
        {
            Gizmos.color = Color.cyan;
            Gizmos.DrawWireSphere(_floatingWordAnchor.position, 0.2f);
        }
    }
}
}