using UnityEngine;
using UnityEngine.AI;
using UnityEngine.InputSystem;

public class ClickToMoveInputSystem : MonoBehaviour
{
    [Header("References")]
    public Camera cam;
    public LayerMask movementLayers;   // ground
    public LayerMask selectionLayers;  // enemies, NPCs, interactables

    void Awake()
    {
        if (cam == null) cam = Camera.main;
    }

    // Hook this to PointerPos action (Value Vector2)
    Vector2 pointerScreenPos;
    public void OnPointerPos(InputAction.CallbackContext ctx)
    {
        pointerScreenPos = ctx.ReadValue<Vector2>();
    }

    // Hook this to LeftClick action (Button)
    public void OnLeftClick(InputAction.CallbackContext ctx)
    {
        if (!ctx.performed) return;
        if (cam == null) return;

        Ray ray = cam.ScreenPointToRay(pointerScreenPos);
        if (Physics.Raycast(ray, out RaycastHit hit, 500f, selectionLayers))
        {
            // Try to find a Character on the hit object or its parents
            var character = hit.collider.GetComponentInParent<Character>();
            if (character != null)
            {
                if (Player.Current != null) Player.Current.SetTarget(character);
                var selectable = hit.collider.GetComponentInParent<ISelectable>();
                selectable?.OnSelected();
                return;
            }

            // Generic interactable
            var interactable = hit.collider.GetComponentInParent<Interactable>();
            interactable?.OnSelect();
            return;
        }

        // Nothing selected, clear target
        if (Player.Current != null) Player.Current.SetTarget(null);
    }

    // Hook this to RightClick action (Button)
    public void OnRightClick(InputAction.CallbackContext ctx)
    {
        if (!ctx.performed) return;
        if (cam == null) return;
        if (Player.Current == null) return;

        Ray ray = cam.ScreenPointToRay(pointerScreenPos);
        if (Physics.Raycast(ray, out RaycastHit hit, 500f, movementLayers))
        {
            // Move player's movement controller or NavMeshAgent
            var movement = Player.Current.MovementController;
            if (movement != null)
            {
                movement.MoveTo(hit.point);
            }
            else
            {
                // fallback: try to find NavMeshAgent on player root
                var agent = Player.Current.GetComponent<UnityEngine.AI.NavMeshAgent>();
                if (agent != null) agent.SetDestination(hit.point);
            }
        }
    }

    // Optional fallback if PointerPos not wired
    void Update()
    {
        if (cam == null) return;
        if (Mouse.current == null) return;

        pointerScreenPos = Mouse.current.position.ReadValue();

        if (Mouse.current.leftButton.wasPressedThisFrame)
        {
            // simulate InputAction callback context by calling handler directly
            OnLeftClick(new InputAction.CallbackContext());
        }

        if (Mouse.current.rightButton.wasPressedThisFrame)
        {
            OnRightClick(new InputAction.CallbackContext());
        }
    }
}