using UnityEngine;
using UnityEngine.InputSystem;
using Yarn.Unity;

namespace NightclubArcadia.Dialogue
{
    /// <summary>
    /// Trigger-zone interactable: player walks in range, presses E, and this
    /// starts the given Yarn node. The reverse of DialogueTransitionController's
    /// <<enter_environment>> — this is the "step into dialogue" half of the loop.
    /// </summary>
    public class DialogueInteractable : MonoBehaviour
    {
        [SerializeField] private DialogueRunner dialogueRunner;
        [SerializeField] private GameObject dialogueUI;
        [SerializeField] private string yarnNodeName = "Bartender_Chat";

        private bool playerInRange;
        private InputAction interactAction;

        void Awake()
        {
            interactAction = new InputAction("Interact");
            interactAction.AddBinding("<Keyboard>/e");
            interactAction.AddBinding("<Gamepad>/buttonNorth");
            interactAction.performed += _ =>
            {
                if (playerInRange)
                {
                    StartConversation();
                }
            };
        }

        void OnEnable() => interactAction?.Enable();
        void OnDisable() => interactAction?.Disable();

        void OnTriggerEnter(Collider other)
        {
            if (other.CompareTag("Player"))
            {
                playerInRange = true;
            }
        }

        void OnTriggerExit(Collider other)
        {
            if (other.CompareTag("Player"))
            {
                playerInRange = false;
            }
        }

        async void StartConversation()
        {
            // Player controls are locked by DialogueTransitionController off the
            // runner's onDialogueStart event — nothing to do for that here.
            if (DialogueUIVisibility.Show(dialogueUI))
            {
                // Only reached if the UI was found deactivated; give TMP a
                // frame to re-cache its Canvas in OnEnable before any text is
                // generated.
                await Awaitable.NextFrameAsync();
            }

            await dialogueRunner.StartDialogue(yarnNodeName);
        }
    }
}