campfire/Assets/Scripts/Campfire.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Campfire : MonoBehaviour {
    public GameState GameState;
    public Light DynamicLight;
    [Tooltip("This audiosource will play the clips to indicate that an object has been thrown in the fire.")]
    public AudioSource BurnEffectSource;
    public float GoodFuelAmount;
    [Tooltip("The light turns this color when Fuel < GoodFuelAmount. Otherwise it'll be as it is in the editor.")]
    public Color TooLowFuelColor;
    public float RandomVarianceDuration;
    public float RandomVarianceMagnitude;
    [Tooltip("How long of a break the campfire takes between eating logs, if multiple are placed on it.")]
    public float LogBurningCooldown;

    [Header("Runtime values")]
    public float Fuel;

    private Color EnoughFuelColor;
    private float FullRange;

    private float RandomVariance = 0;
    private float NextRandomVariance = 0;
    private float LastRandomVarianceChange = 0;

    private List<Burnable> LogQueue = new List<Burnable>();
    private float LastLogBurned = 0;

    private void Awake() {
        EnoughFuelColor = DynamicLight.color;
        FullRange = DynamicLight.range;
    }

    private void Update() {
        if (LogQueue.Count > 0 && Time.time - LastLogBurned > LogBurningCooldown) {
            LastLogBurned = Time.time;
            BurnLog(LogQueue[0]);
            LogQueue.RemoveAt(0);
        }

        if (Time.time - LastRandomVarianceChange > RandomVarianceDuration) {
            NextRandomVariance = (Random.value - 0.5f) * 2f * RandomVarianceMagnitude;
            LastRandomVarianceChange = Time.time;
        }
        RandomVariance = Mathf.Lerp(RandomVariance, NextRandomVariance, (Time.time - LastRandomVarianceChange) / RandomVarianceDuration);

        Fuel -= Time.deltaTime;
        DynamicLight.range = Mathf.Log(Fuel + 1f, 10) / 2f * FullRange + RandomVariance;
        DynamicLight.color = Color.Lerp(DynamicLight.color, Fuel < GoodFuelAmount ? TooLowFuelColor : EnoughFuelColor, 10f * Time.deltaTime);

        if (Fuel <= 0) {
            GameState.Current = State.GameOver;
        }
    }

    private void BurnLog(Burnable burnable) {
        Fuel += burnable.Quality.FuelValue;
        if (Fuel < GoodFuelAmount) {
            Fuel += 2;
        }
        BurnEffectSource.PlayOneShot(burnable.Quality.BurningSound);
        Destroy(burnable.gameObject);
    }

    private void OnCollisionEnter(Collision c) {
        if (c.collider.attachedRigidbody != null && c.collider.attachedRigidbody) {
            Burnable Burnable = c.collider.attachedRigidbody.GetComponent<Burnable>();
            if (Burnable != null) {
                LogQueue.Add(Burnable);
            }
        }
    }

    private void OnCollisionExit(Collision c) {
        if (c.collider.attachedRigidbody != null && c.collider.attachedRigidbody) {
            Burnable Burnable = c.collider.attachedRigidbody.GetComponent<Burnable>();
            if (Burnable != null) {
                LogQueue.Remove(Burnable);
            }
        }
    }
}