SpawnManager

using System.Collections.Generic;
using UnityEngine;

public enum SpawnManagerMode
{
    Discrete,
    Roulette
}

public class SpawnManager : MonoBehaviour
{
    public SpawnManagerMode mode;
    [Range(0, 64)]
    public int rouletteMin;
    [Range(0, 64)]
    public int rouletteMax;
    [Range(0, 100)]
    public int spawnChance = 100;
    public bool spawnOnStart;
    public SpawnableObject[] spawnableObjects;

    public void Start()
    {
        Despawn();
        if (spawnOnStart)
        {
            Spawn();
        }
    }

    /**
     * Despawns all spawnable objects from the world.
     */
    public void Despawn()
    {
        foreach (SpawnableObject spawnableObject in this.spawnableObjects)
        {
            if(spawnableObject != null && spawnableObject.worldObject != null)
            {
                spawnableObject.worldObject.gameObject.SetActive(false);
            }
        }
    }

    public void Spawn()
    {
        switch (mode)
        {
            case SpawnManagerMode.Discrete:
                foreach (SpawnableObject spawnableObject in this.spawnableObjects)
                {
                    if (spawnableObject != null && spawnableObject.worldObject != null)
                    {
                        if (Random.Range(0, 100) <= spawnableObject.discreteChance)
                        {
                            spawnableObject.worldObject.gameObject.SetActive(true);
                        }
                        else
                        {
                            spawnableObject.worldObject.gameObject.SetActive(false);
                        }
                    }
                }
                break;
            case SpawnManagerMode.Roulette:
                int totalWeight = 0;
                List<SpawnableObject> availableObjects = new List<SpawnableObject>();
                for (int i = 0; i < spawnableObjects.Length; i++)
                {
                    if (spawnableObjects[i] != null && spawnableObjects[i].rouletteWeight > 0)
                    {
                        availableObjects.Add(spawnableObjects[i]);
                        totalWeight += spawnableObjects[i].rouletteWeight;
                    }
                }
                if (availableObjects.Count > 0 && totalWeight > 0)
                {
                    int objectsToSpawn = Random.Range(rouletteMin, rouletteMax + 1);
                    objectsToSpawn = Mathf.Min(objectsToSpawn, availableObjects.Count);
                    List<SpawnableObject> spawnedObjects = new List<SpawnableObject>();
                    for (int spawnCount = 0; spawnCount < objectsToSpawn; spawnCount++)
                    {
                        int randomWeight = Random.Range(0, totalWeight);
                        int currentWeightSum = 0;
                        SpawnableObject selectedObject = null;
                        foreach (var obj in availableObjects)
                        {
                            currentWeightSum += obj.rouletteWeight;
                            if (randomWeight < currentWeightSum)
                            {
                                selectedObject = obj;
                                break;
                            }
                        }
                        if (selectedObject != null)
                        {
                            selectedObject.worldObject.gameObject.SetActive(true);
                            spawnedObjects.Add(selectedObject);
                            availableObjects.Remove(selectedObject);
                            totalWeight -= selectedObject.rouletteWeight;
                        }
                    }
                }
                break;
            default:
                break;
        }
    }

#if UNITY_EDITOR
    private void OnDrawGizmos()
    {
        Gizmos.DrawIcon(this.gameObject.transform.position,"SpawnManager",true);
    }
#endif


    void OnDrawGizmosSelected()
    {
        if (spawnableObjects != null)
        {
            foreach (SpawnableObject spawnableObject in spawnableObjects)
            {
                if (spawnableObject != null && spawnableObject.worldObject != null)
                {
                    Gizmos.color = Color.green;
                    Gizmos.DrawLine(transform.position, spawnableObject.worldObject.gameObject.transform.position);
                }
            }
        }
    }
}