using UnityEngine;


public class Boid : MonoBehaviour {
    // public float speed = 0.2f;
    // public int neighbourCount = 0;
    // public float inertia = 0.2f;
    // public float alignmentForce = 1.0f;
    // public float cohesionForce = 1.0f;
    // public float separationForce = 1.0f;
    // public float separationDistance = 0.5f;
    // public float bodyForce = 1;

    public const int BoundaryType = 1;
    public const int BoidType = 2;

    public SwarmControl sc;
    public Vector3 velocity = Vector3.zero;
    public Vector3 acceleration = Vector3.zero;

    private Bounds innerBounds;
    private Bounds outerBounds;

    public NeuroidNetwork neuroidNet = new();
    public Perception perception;

    public Nucleus behaviour;

    public Neuroid totalForce;

    public int id;

    void Awake() {
        this.id = this.GetInstanceID();

        sc = FindFirstObjectByType<SwarmControl>();

        innerBounds = new(sc.transform.position, sc.spaceSize - 2 * sc.boundaryWidth);
        outerBounds = new(sc.transform.position, sc.spaceSize);

        perception = new Perception(neuroidNet);

        //behaviour = new Roaming(neuroidNet, perception, sc);
        behaviour = new Swarming(neuroidNet, perception, sc);

        totalForce = new(neuroidNet, "Total");
        behaviour.AddReceiver(totalForce);
    }

    void Update() {
        Collider[]  results = Physics.OverlapSphere(this.transform.position, sc.perceptionDistance);
        foreach (Collider c in results) {
            if (c as CapsuleCollider != null) {
                Boid neighbour = c.GetComponentInParent<Boid>();
                if (neighbour == null || neighbour == this)
                    continue;

                Vector3 localPosition = neighbour.transform.position - this.transform.position;

                int thingId = neighbour.GetInstanceID();
                perception.ProcessStimulus(thingId, BoidType, localPosition); //, neighbour.gameObject.name);
            }
        }

        if (!innerBounds.Contains(this.transform.position)) {
            Vector3 point = this.transform.position;
            Vector3 pointOnBounds = innerBounds.ClosestPoint(point);
            Vector3 desiredWorldSpace = (pointOnBounds - point).normalized * sc.speed;
            Vector3 desiredLocalSpace = -this.transform.InverseTransformPoint(desiredWorldSpace);
            perception.ProcessStimulus(777, BoundaryType, desiredLocalSpace, "Boundary");
        }
        else {
            perception.RemoveStimulus(777);
        }

        Vector3 worldForce = this.transform.TransformDirection(totalForce.outputValue);

        this.velocity = (1 - sc.inertia) * (worldForce * Time.deltaTime) + sc.inertia * velocity;
        if (this.velocity.magnitude > 0)
            this.velocity = this.velocity.normalized * sc.speed;
        else
            this.velocity = this.transform.forward * sc.speed;

        this.transform.position += this.velocity * Time.deltaTime;

        if (this.velocity != Vector3.zero) {
            Quaternion targetRotation = Quaternion.LookRotation(this.velocity);
            transform.rotation = Quaternion.Slerp(transform.rotation, targetRotation, Time.deltaTime * 2f); // Adjust the speed of rotation        
        }

        neuroidNet.Update();
    }

    Vector3 ClosestPointOnBoundsSurface(Bounds b, Vector3 p) {
        if (!b.Contains(p)) return b.ClosestPoint(p);
        Vector3 d = p - b.center;
        Vector3 ext = b.extents;
        float sx = ext.x / Mathf.Abs(d.x);
        float sy = ext.y / Mathf.Abs(d.y);
        float sz = ext.z / Mathf.Abs(d.z);
        float m = Mathf.Min(sx, Mathf.Min(sy, sz));
        return b.center + d * m;
    }

    void OnDrawGizmosSelected() {
        Gizmos.DrawWireSphere(transform.position, sc.perceptionDistance);
        Gizmos.color = Color.yellow;
        Vector3 worldForce = this.transform.TransformDirection(totalForce.outputValue);
        Gizmos.DrawRay(transform.position, worldForce * 10);
        // Gizmos.color = Color.magenta;
        // Gizmos.DrawRay(transform.position, this.transform.TransformDirection(avoidance.outputValue) * 10);
        // Debug.Log($"Avoidance {roaming.avoidance.outputValue} Roaming {roaming.output.outputValue} Total {totalForce.outputValue}");
        // Debug.Log($"WorldForce {worldForce} velocity {velocity} inertia {sc.inertia}");
        Gizmos.color = Color.blue;
        Gizmos.DrawRay(transform.position, this.velocity * 10);
    }
}