using UnityEngine;

[RequireComponent(typeof(Collider))]
public class Skywalker_FrontFan : MonoBehaviour
{
    [Header("Fan Settings")]
    public float maxPushForce = 30f;         // strongest wind at fan's start
    public float minPushForce = 5f;          // weakest wind near the end
    public float counterForceMultiplier = 3f; // extra push if running into wind
    public bool debugGizmo = true;

    private BoxCollider fanCollider;

    private void Awake()
    {
        fanCollider = GetComponent<BoxCollider>();
        if (fanCollider != null) fanCollider.isTrigger = true;
    }

    private void OnTriggerStay(Collider col)
    {
        if (!col.CompareTag("Player")) return;

        Rigidbody rb = col.attachedRigidbody;
        if (rb == null) return;

        Vector3 windDir = transform.up.normalized;

        // Calculate how far player is inside the fan tunnel (0 = near fan, 1 = far end)
        float localZ = transform.InverseTransformPoint(col.transform.position).z;
        float halfDepth = fanCollider.size.z * 0.5f;
        float t = Mathf.InverseLerp(-halfDepth, halfDepth, localZ);

        // Interpolate force based on distance (closer = stronger)
        float pushForce = Mathf.Lerp(maxPushForce, minPushForce, t);

        Vector3 force = windDir * pushForce;

        // If player is moving against the wind, apply stronger push
        float dot = Vector3.Dot(rb.velocity.normalized, -windDir);
        if (dot > 0.5f) // player moving forward into wind
        {
            force += windDir * (pushForce * (counterForceMultiplier - 1));
        }

        // Apply only horizontal push
        rb.AddForce(new Vector3(force.x, 0f, force.z), ForceMode.Acceleration);
    }

    private void OnDrawGizmos()
    {
        if (!debugGizmo) return;

        BoxCollider col = GetComponent<BoxCollider>();
        if (col == null) return;

        Gizmos.color = Color.blue;
        Gizmos.DrawWireCube(transform.position + col.center, col.size);

        // Wind direction arrow
        Gizmos.color = Color.cyan;
        Gizmos.DrawRay(transform.position, transform.up * 2f);
    }
}