using NightclubArcadia.UI;
using UnityEngine;
using Yarn.Unity;

namespace NightclubArcadia.Dialogue
{
    /// <summary>
    /// Owns the hand-off between dialogue and the 3D environment: locks the
    /// player's controls for as long as a conversation is running, and registers
    /// the &lt;&lt;enter_environment&gt;&gt; Yarn command that hands control back.
    ///
    /// The lock is driven by the DialogueRunner's own lifecycle events rather
    /// than by each interactable, so every entry point — auto-started nodes,
    /// NPCStandIn, DialogueInteractable — gets the same behaviour without
    /// having to remember to do it. Control locking is delegated to
    /// <see cref="PlayerControlLock"/> so the player menu can hold a second
    /// independent lock without re-enabling movement mid-conversation.
    /// </summary>
    public class DialogueTransitionController : MonoBehaviour
    {
        [SerializeField] private DialogueRunner dialogueRunner;
        [SerializeField] private GameObject dialogueUI;
        [SerializeField] private GameObject playerArmature;
        [SerializeField] private PlayerControlLock controlLock;

        void Awake()
        {
            if (controlLock == null && playerArmature != null)
            {
                controlLock = playerArmature.GetComponent<PlayerControlLock>();
            }

            // Subscribed in Awake rather than Start: the runner auto-starts its
            // first node from its own Start(), and script execution order
            // between the two is not guaranteed.
            dialogueRunner.onDialogueStart?.AddListener(OnDialogueStart);
            dialogueRunner.onDialogueComplete?.AddListener(OnDialogueComplete);
        }

        void Start()
        {
            if (controlLock == null && playerArmature != null)
            {
                controlLock = playerArmature.GetComponent<PlayerControlLock>();
            }

            // Dialogue is in progress as soon as this controller is active
            // (including auto-started nodes), so the player stays locked out
            // until <<enter_environment>>. The armature itself stays
            // active/visible — only its controls are disabled.
            controlLock?.Acquire(this);

            dialogueRunner.AddCommandHandler("enter_environment", EnterEnvironment);
        }

        void OnDestroy()
        {
            dialogueRunner.onDialogueStart?.RemoveListener(OnDialogueStart);
            dialogueRunner.onDialogueComplete?.RemoveListener(OnDialogueComplete);
        }

        void OnDialogueStart()
        {
            DialogueUIVisibility.Show(dialogueUI);
            UIStateController.Instance?.SetDialogueActive(true);
            controlLock?.Acquire(this);
        }

        // Safety net: a node that ends without <<enter_environment>> must still
        // give the player their controls back.
        void OnDialogueComplete() => EnterEnvironment();

        void EnterEnvironment()
        {
            // Hide, don't deactivate: deactivating the Canvas breaks TMP's
            // cached Canvas reference and makes the next conversation throw.
            // See DialogueUIVisibility / PanelVisibility.
            DialogueUIVisibility.Hide(dialogueUI);
            UIStateController.Instance?.SetDialogueActive(false);
            // Release is idempotent on a HashSet — safe when both
            // <<enter_environment>> and onDialogueComplete fire.
            controlLock?.Release(this);
        }
    }
}