using System;
using System.Collections.Generic;
using System.Dynamic;
using System.Linq;
using Unity.VisualScripting;
using UnityEditor;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.UIElements;
using static UnityEngine.GraphicsBuffer;

[ExecuteAlways]
public class GameManager : MonoBehaviour
{
    public Transform ConnectionParent;
    public Transform NodeParent;
    public GameObject NodePrefab;

    public static GameManager Instance { get; private set; }

    public bool regenerateOnChange = false;

    [HideInInspector] public float minConnectionLength = 6;
    [HideInInspector] public float maxConnectionLength = 6;
    [HideInInspector] public int nodeCount = 100;
    [HideInInspector] public int hoverRadiusCon = 50;
    [HideInInspector] public int hoverRadiusNode = 50;
    [HideInInspector] public int selectedLevel = -1;

    [SerializeField] [HideInInspector] public List<Connection> connections = new List<Connection>();
    [SerializeField] [HideInInspector] public List<Node> nodes = new List<Node>();
    [SerializeField] [HideInInspector] public List<LevelData> levels = new List<LevelData>();

    [Serializable]
    public class Connection
    {
        public Node nodeA, nodeB;
        public bool allowed = true;
        public bool hovered = false;
        public LineRenderer lineRenderer;

        public void SetConnect()
        {
            if (!allowed) return;
            nodeA.connected.Add(nodeB);
            nodeB.connected.Add(nodeA);
        }

        public void DelConnect()
        {
            nodeA.connected.Remove(nodeB);
            nodeB.connected.Remove(nodeA);
        }
    }

    [Serializable]
    public class LevelData
    {
        [Serializable]
        public class NodeData
        {
            public Vector3 position;
            public int owner;
        }

        [Serializable]
        public class ConnectionData
        {
            public int nodeAIndex;
            public int nodeBIndex;
            public bool allowed = true;
        }

        public float minConnectionLength = 0;
        public float maxConnectionLength = 0;
        public List<NodeData> nodes = new List<NodeData>();
        public List<ConnectionData> connections = new List<ConnectionData>();
    }

    void Awake()
    {
        if (Instance != null && Instance != this)
        {
            if (Application.isPlaying)
                Destroy(gameObject);
            return;
        }

        Instance = this;
        if (Application.isPlaying)
            DontDestroyOnLoad(gameObject);


        connections.ForEach(obj => obj.DelConnect());
        connections.ForEach(obj => obj.SetConnect());

    }

    public void GenerateAlongSphere()
    {
        connections.Clear();
        nodes.Clear();

        for (int i = NodeParent.childCount - 1; i >= 0; i--)
            DestroyImmediate(NodeParent.GetChild(i).gameObject);

        float radius = 20f;
        float goldenRatio = (1f + Mathf.Sqrt(5f)) / 2f;
        float angleIncrement = 2f * Mathf.PI * goldenRatio;

        for (int i = 0; i < nodeCount; i++)
        {
            float t = (float)i / nodeCount; // 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 = PrefabUtility.InstantiatePrefab(NodePrefab, NodeParent) as GameObject;
            auto.transform.localPosition = pos;
            nodes.Add(auto.GetComponent<Node>());
        }
    }

    public void GenerateConnections()
    {
        connections.Clear();

        foreach (LineRenderer line in ConnectionParent.GetComponentsInChildren<LineRenderer>())
            DestroyImmediate(line.gameObject);

        foreach (Node nodeA in nodes)
        {
            if (nodeA == null) continue;
            foreach (Node nodeB in nodes)
            {
                if (nodeB == null) continue;
                bool conExists = false;
                float dist = Vector3.Distance(nodeA.transform.position, nodeB.transform.position);
                if (nodeA == nodeB || dist > 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)
                {
                    AddConnection(nodeA, nodeB, dist < minConnectionLength);
                }
            }
                   
        }
    }

    public void FetchAllNodes()
    {
        Node[] allNodes = NodeParent.GetComponentsInChildren<Node>();

        nodes = allNodes.ToList();
        nodeCount = allNodes.Length;
    }

    private void Update()
    {
        foreach (var con in connections)
        {
            if(Application.isPlaying && !con.allowed)
            {
                con.lineRenderer.enabled = false;
                continue;
            }

            float width = (con.hovered ? 0.6f : 0.3f) * (con.allowed ? 1f : 0.3f);

            con.lineRenderer.startColor = con.allowed ? con.nodeA.transform.GetChild(0).GetComponent<Renderer>().sharedMaterial.color : new Color(0.2f, 0.2f, 0.2f);
            con.lineRenderer.endColor = con.allowed ? con.nodeB.transform.GetChild(0).GetComponent<Renderer>().sharedMaterial.color : new Color(0.2f, 0.2f, 0.2f);
            con.lineRenderer.startWidth = width;
            con.lineRenderer.endWidth = width;

            con.lineRenderer.SetGreatCircleArc(con.nodeA.transform.position, con.nodeB.transform.position, 5, 20.5f);
            con.lineRenderer.enabled = true;
        }
    }

    public void AddConnection(Node nodeA, Node nodeB, bool allowed = true)
    {
        var dummy = new GameObject("dummy");
        dummy.transform.SetParent(ConnectionParent);
        var newCon = new Connection
        {
            nodeA = nodeA,
            nodeB = nodeB,
            allowed = allowed,
            lineRenderer = dummy.AddComponent<LineRenderer>()
        };

        newCon.lineRenderer.enabled = false;
        newCon.lineRenderer.material = new Material(Shader.Find("Sprites/Default"));
        newCon.lineRenderer.positionCount = 3;

        connections.Add(newCon);
    }

    public void LoadLevelData(int index)
    {
        if(index >= levels.Count)
        {
            Debug.LogWarning("LevelIndex out of range");
            return;
        }

        connections.Clear();
        nodes.Clear();

        for (int i = NodeParent.childCount - 1; i >= 0; i--)
            DestroyImmediate(NodeParent.GetChild(i).gameObject);

        foreach (LineRenderer line in ConnectionParent.GetComponentsInChildren<LineRenderer>())
            DestroyImmediate(line.gameObject);


        foreach(LevelData.NodeData nodeData in levels[index].nodes)
        {
            var auto = PrefabUtility.InstantiatePrefab(NodePrefab, NodeParent) as GameObject;
            auto.transform.localPosition = nodeData.position;
            nodes.Add(auto.GetComponent<Node>());
            auto.GetComponent<Node>().Owner = nodeData.owner;
        }

        foreach (LevelData.ConnectionData conData in levels[index].connections)
        {
            AddConnection(nodes[conData.nodeAIndex], nodes[conData.nodeBIndex], conData.allowed);
        }
        selectedLevel = index;
        minConnectionLength = levels[index].minConnectionLength;
        maxConnectionLength = levels[index].maxConnectionLength;
        nodeCount = nodes.Count;
    }

    public void SaveLevelData(int index = -1)
    {
        LevelData data = new LevelData();

        data.minConnectionLength = minConnectionLength;
        data.maxConnectionLength = maxConnectionLength;

        // Nodes speichern
        foreach (var node in nodes)
        {
            data.nodes.Add(new LevelData.NodeData
            {
                position = node.transform.localPosition,
                owner = node.Owner
            });
        }

        // Connections speichern
        foreach (var con in connections)
        {
            int idxA = nodes.IndexOf(con.nodeA);
            int idxB = nodes.IndexOf(con.nodeB);
            if (idxA >= 0 && idxB >= 0)
            {
                data.connections.Add(new LevelData.ConnectionData
                {
                    nodeAIndex = idxA,
                    nodeBIndex = idxB,
                    allowed = con.allowed
                });
            }
        }

        if (index == -1 || index >= levels.Count)
            levels.Add(data);
        else
            levels[index] = data;

        int newIndex = index < 0 ? levels.Count - 1 : index;
        selectedLevel = newIndex;
    }
}