using UnityEngine;
using System.Collections.Generic;

public class SpawnManager : MonoBehaviour
{
    private float[] spawnPositionsEnemiesOppositeZ = { 3.7f, 11f, 17.8f, 24.6f, 31.8f, 39f };
    private float[] spawnPositionsEnemiesForwardsZ = { -3.7f, -11f, -17.8f, -24.6f, -31.8f, -39f };
    private float[] spawnPositionsObstaclesZ = { 3.7f, 11f, 17.8f, 24.6f, 31.8f, 39f, -3.7f, -11f, -17.8f, -24.6f, -31.8f, -39f };
    private float spawnPositionSafezoneZ = -39f;
    private float? safezoneZ = null;
    private float safezoneTime = 10f;
    private float safezoneStopX = 0f;
    public GameObject safezonePrefab;
    private List<float> occupiedZPositions = new List<float>();
    public GameObject[] enemyPrefabs;
    public GameObject[] obstaclePrefabs;
    private List<Rigidbody> activeEnemies = new List<Rigidbody>();
    private List<Rigidbody> activeObstacles = new List<Rigidbody>();
    public float vehicleSpeed = 75f;
    public float despawnX = 50f;
    private PlayerController playerControllerScript;

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        playerControllerScript = GameObject.Find("Player").GetComponent<PlayerController>();
        float spawnInterval = Random.Range(1.8f, 2.3f); 
        float safezoneInterval = Random.Range(20f, 30f); 
        InvokeRepeating("SpawnRandomObject", 10f, spawnInterval);
        InvokeRepeating("SpawnSafezone", 0f, safezoneInterval);
    }

    void SpawnRandomObject()
    {
        if (playerControllerScript.gameOver)
            return;

        occupiedZPositions.Clear();

        // Wie viele Objekte gleichzeitig spawnen sollen (zufällig oder fix)
        int objectsToSpawn = Random.Range(1, 10); // 1 bis 9 pro Spawn-Aufruf

        for (int i = 0; i < objectsToSpawn; i++)
        {
            float rand = Random.value;

            if (rand < 0.6f)
                SpawnRandomEnemy();
            else
                SpawnRandomObstacle();
        }
    }

    void FixedUpdate()
    {
        if (!playerControllerScript.gameOver)
        {
            // Gegner bewegen
            for (int i = activeEnemies.Count - 1; i >= 0; i--)
            {
                Rigidbody rb = activeEnemies[i];
                if (rb == null) { activeEnemies.RemoveAt(i); continue; }

                rb.AddForce(rb.gameObject.GetComponent<MoveData>().moveDir * 6, ForceMode.Force);

                if (Mathf.Abs(rb.position.x) > despawnX)
                {
                    occupiedZPositions.Remove(rb.position.z); // Z wieder freigeben
                    Destroy(rb.gameObject);
                    activeEnemies.RemoveAt(i);
                }
            }

            // Hindernisse bewegen
            for (int i = activeObstacles.Count - 1; i >= 0; i--)
            {
                Rigidbody rb = activeObstacles[i];
                if (rb == null) { activeObstacles.RemoveAt(i); continue; }

                rb.AddForce(rb.gameObject.GetComponent<MoveData>().moveDir * 6, ForceMode.Force);

                if (Mathf.Abs(rb.position.x) > despawnX)
                {
                    occupiedZPositions.Remove(rb.position.z);
                    Destroy(rb.gameObject);
                    activeObstacles.RemoveAt(i);
                }
            }

            foreach (var safezone in GameObject.FindObjectsOfType<SafezoneData>())
            {
                Rigidbody rb = safezone.GetComponent<Rigidbody>();
                if (rb == null) continue;

                // Prüfen, ob Stop erreicht
                if (rb.position.x > safezone.stopX || safezone.playerOn)
                {
                    rb.AddForce(safezone.moveDir * 2, ForceMode.Force); // bewegt sich
                }
                else
                {
                    rb.linearVelocity = Vector3.zero; // stoppt
                    safezone.waitTime -= Time.fixedDeltaTime;

                    if (safezone.waitTime <= 0f)
                    {
                        // Player ist nicht drauf -> Game Over
                        PlayerController pc = GameObject.Find("Player").GetComponent<PlayerController>();
                        if (!safezone.playerHasBeenOn)
                            pc.gameOver = true;

                        Destroy(safezone.gameObject); // Safezone weg
                        safezoneZ = null;
                    }
                }
            }
        }
    }


    void SpawnRandomEnemy()
    {
        GameObject chosenPrefab = enemyPrefabs[Random.Range(0, enemyPrefabs.Length)];
        bool spawnOpposite = Random.value > 0.5f;
        float[] possibleZ = spawnOpposite ? spawnPositionsEnemiesOppositeZ : spawnPositionsEnemiesForwardsZ;

        // Filtere belegte Z-Positionen heraus
        List<float> availableZ = new List<float>();
        foreach (var z in possibleZ)
            if (!occupiedZPositions.Contains(z) && z != safezoneZ)
                availableZ.Add(z);

        if (availableZ.Count == 0)
            return; // keine freie Spur

        float chosenZ = availableZ[Random.Range(0, availableZ.Count)];
        occupiedZPositions.Add(chosenZ);

        Vector3 spawnPos = spawnOpposite ? new Vector3(40f, 0.5f, chosenZ) : new Vector3(-40f, 0.5f, chosenZ);
        Vector3 moveForce = spawnOpposite ? Vector3.left * vehicleSpeed : Vector3.right * vehicleSpeed;

        GameObject enemy = Instantiate(chosenPrefab, spawnPos, chosenPrefab.transform.rotation);
        Rigidbody rb = enemy.GetComponent<Rigidbody>();
        if (rb != null)
        {
            rb.constraints = RigidbodyConstraints.FreezeRotationX | RigidbodyConstraints.FreezeRotationZ;
            MoveData data = enemy.AddComponent<MoveData>();
            data.moveDir = moveForce;
            activeEnemies.Add(rb);
        }
    }

    void SpawnRandomObstacle()
    {
        GameObject chosenPrefab = obstaclePrefabs[Random.Range(0, obstaclePrefabs.Length)];

        // Filtere belegte Z-Positionen
        List<float> availableZ = new List<float>();
        foreach (var z in spawnPositionsObstaclesZ)
            if (!occupiedZPositions.Contains(z) && z != safezoneZ)
                availableZ.Add(z);

        if (availableZ.Count == 0)
            return; // keine freie Spur

        float chosenZ = availableZ[Random.Range(0, availableZ.Count)];
        occupiedZPositions.Add(chosenZ);

        Vector3 spawnPos = new Vector3(40f, 0.5f, chosenZ);
        GameObject obstacle = Instantiate(chosenPrefab, spawnPos, chosenPrefab.transform.rotation);
        Rigidbody rb = obstacle.GetComponent<Rigidbody>();
        if (rb != null)
        {
            rb.constraints = RigidbodyConstraints.FreezeRotationX | RigidbodyConstraints.FreezeRotationZ;
            MoveData data = obstacle.AddComponent<MoveData>();
            data.moveDir = Vector3.left * vehicleSpeed;
            activeObstacles.Add(rb);
        }
    }

    void SpawnSafezone()
    {
        if (safezonePrefab == null) return;

        Vector3 spawnPos = new Vector3(40f, 0.5f, spawnPositionSafezoneZ);
        GameObject safezone = Instantiate(safezonePrefab, spawnPos, safezonePrefab.transform.rotation);
        safezoneZ = spawnPositionSafezoneZ;

        Rigidbody rb = safezone.GetComponent<Rigidbody>();
        if (rb != null)
        {
            rb.constraints = RigidbodyConstraints.FreezeRotationX | RigidbodyConstraints.FreezeRotationZ;

            SafezoneData data = safezone.AddComponent<SafezoneData>();
            data.moveDir = Vector3.left * vehicleSpeed; // fährt nach -X
            data.stopX = safezoneStopX;
            data.waitTime = safezoneTime;
        }
    }
}

public class MoveData : MonoBehaviour
{
    public Vector3 moveDir;
}