using System;
using System.Collections.Generic;
using Unity.VisualScripting;
using UnityEditor;
using UnityEngine;
using UnityEngine.Rendering;

[ExecuteAlways]
public class GameManager : MonoBehaviour
{
    [HideInInspector]
    public static GameManager instance;

    [SerializeField]
    private Transform NodeParent;

    [SerializeField]
    private GameObject NodePrefab;


    [Header("Parameters")]
    [Range(0, 100)]
    public float maxConnectionLength;


    private List<Node> nodes = new List<Node>();

    [SerializeField]
    public List<Connection> connections = new List<Connection>();

    [Serializable]
    public struct Connection
    {
        public Node nodeA, nodeB;
        public bool allowed;
    }

    [ContextMenu("Generate Along Sphere")]
    void GenerateAlongSphere()
    {
        connections.Clear();
        nodes.Clear();


        int pointCount = 100;
        float radius = 20f;

        float goldenRatio = (1f + Mathf.Sqrt(5f)) / 2f;
        float angleIncrement = 2f * Mathf.PI * goldenRatio;

        for (int i = 0; i < pointCount; i++)
        {
            float t = (float)i / pointCount; // von 0 bis 1
            float inclination = Mathf.Acos(1f - 2f * t);
            float azimuth = angleIncrement * i;

            float x = Mathf.Sin(inclination) * Mathf.Cos(azimuth);
            float y = Mathf.Sin(inclination) * Mathf.Sin(azimuth);
            float z = Mathf.Cos(inclination);

            Vector3 pos = new Vector3(x, y, z) * radius;

            var auto = Instantiate(NodePrefab, NodeParent);
            auto.transform.localPosition = pos;
            nodes.Add(auto.GetComponent<Node>());
        }
    }

    [ContextMenu("Generate Connections")]
    void GenerateConnections()
    {
        connections.Clear();

        foreach (Node nodeA in nodes)
        {
            if (nodeA == null) continue;
            foreach (Node nodeB in nodes)
            {
                if (nodeB == null) continue;
                bool conExists = false;
                if (nodeA == nodeB || Math.Abs(Vector3.Distance(nodeA.transform.position, nodeB.transform.position)) > maxConnectionLength)
                    continue;

                foreach (Connection con in connections)
                {
                    if ((con.nodeA == nodeA && con.nodeB == nodeB) || (con.nodeA == nodeB && con.nodeB == nodeA))
                    {
                        conExists = true;
                        break;
                    }
                }
                if (!conExists)
                    connections.Add(new Connection { nodeA = nodeA, nodeB = nodeB });
            }
        }
    }

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        
    }

    #if UNITY_EDITOR
    void OnDrawGizmos()
    {
        if (connections == null) return;

        // Linien respektieren den Z-Buffer
        Handles.zTest = UnityEngine.Rendering.CompareFunction.LessEqual;

        foreach (var con in connections)
        {
            Handles.color = con.allowed ? Color.green : Color.red;
            Handles.DrawLine(con.nodeA.transform.position, con.nodeB.transform.position);
        }
    }
    #endif
}