Cleaned up project with better structure.

Scripts/Gameplay/Crafting/Building.cs

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+public class Building
+{
+}

Scripts/Gameplay/Crafting/Building.cs.uid

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+uid://cl2yvllo35qbb

Scripts/Gameplay/Crafting/CraftingResult.cs

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+public enum CraftingResult
+{
+    FAILED,
+    CRAFTING,
+    FINISHED
+}

Scripts/Gameplay/Crafting/CraftingResult.cs.uid

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+uid://bd7t0os166lu3

Scripts/Gameplay/Crafting/GameResource.cs

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+public class GameResource
+{
+    public string name;
+    public ItemData item;
+
+    private int currentAmount;
+    private int maxAmount;
+    private bool isEndless;
+    private float extractionSpeed;
+    private double timeSinceLastExtraction;
+
+    public GameResource(string name)
+    {
+        this.name = name;
+        maxAmount = GameData.rand.Next(1000, 10000);
+        currentAmount = maxAmount;
+        isEndless = false;
+        extractionSpeed = 1f;
+        item = GameData.availableItems[name];
+    }
+
+    public bool Extract(double delta)
+    {
+        timeSinceLastExtraction += delta;
+        if (timeSinceLastExtraction < extractionSpeed) return false;
+
+        timeSinceLastExtraction = 0;
+        if (isEndless) return true;
+
+        if (currentAmount > 0)
+        {
+            currentAmount--;
+            return true;
+        }
+
+        return false;
+    }
+
+    public bool CanExtract()
+    {
+        return (isEndless || currentAmount > 0) && GameData.availableResearch[item.Research].state == ResearchState.RESEARCHED;
+    }
+}

Scripts/Gameplay/Crafting/GameResource.cs.uid

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+uid://bh4m8ufiv5kt8

Scripts/Gameplay/Crafting/Ingredient.cs

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+using System.Text.Json.Serialization;
+
+public class Ingredient
+{
+    [JsonPropertyName("item")]
+    public string Item { get; set; }
+
+    [JsonPropertyName("amount")]
+    public int Amount { get; set; }
+}

Scripts/Gameplay/Crafting/Ingredient.cs.uid

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+uid://dital81qfptdr

Scripts/Gameplay/Crafting/Inventory.cs

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+using System;
+using System.Collections.Generic;
+
+public class Inventory
+{
+    public List<Item> items = new List<Item>();
+
+    public int maxInventorySize = 8;
+    public event EventHandler OnInventoryUpdate;
+
+    public bool AddItem(Item item, int amount)
+    {
+        Item inventoryItem = items.Find(x => x.data.Id == item.data.Id && x.currentAmount + amount <= x.data.StackSize);
+        if (inventoryItem != null)
+        {
+            inventoryItem.currentAmount += amount;
+            NotifyInventoryChanged();
+            return true;
+        }
+
+        if (items.Count < maxInventorySize)
+        {
+            items.Add(item);
+            items[items.Count - 1].currentAmount += amount;
+            NotifyInventoryChanged();
+            return true;
+        }
+
+        return false;
+    }
+
+    public bool CanCraft(List<Ingredient> neededIngredients, int amount)
+    {
+        foreach (Ingredient ingredient in neededIngredients)
+        {
+            Item item = items.Find(x => x.data.Id == ingredient.Item && x.currentAmount >= ingredient.Amount * amount);
+            if (item == null)
+            {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    public void RemoveItem(string id, int amount)
+    {
+        Item item = items.Find(x => x.data.Id == id && x.currentAmount >= amount);
+        if (item != null)
+        {
+            item.currentAmount -= amount;
+            NotifyInventoryChanged();
+        }
+    }
+
+    private void NotifyInventoryChanged()
+    {
+        OnInventoryUpdate?.Invoke(this, EventArgs.Empty);
+    }
+}

Scripts/Gameplay/Crafting/Inventory.cs.uid

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+uid://dnbdfvox75hk8

Scripts/Gameplay/Crafting/Item.cs

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+public class Item
+{
+    public ItemData data;
+    public int currentAmount = 0;
+    public double elapsedCraftTime = 0;
+    public int amountCrafted = 0;
+
+    public CraftingResult Craft(int amount, double delta)
+    {
+        elapsedCraftTime += delta;
+        if (elapsedCraftTime >= data.CraftTime)
+        {
+            elapsedCraftTime -= data.CraftTime;
+            if (!GameData.inventory.AddItem(this, 1))
+            {
+                return CraftingResult.FAILED;
+            }
+
+            foreach (Ingredient ingredient in data.Inputs)
+            {
+                GameData.inventory.RemoveItem(ingredient.Item, ingredient.Amount);
+            }
+
+            amountCrafted++;
+            if (amountCrafted >= amount)
+            {
+                amountCrafted = 0;
+                elapsedCraftTime = 0;
+                return CraftingResult.FINISHED;
+            }
+        }
+
+        return CraftingResult.CRAFTING;
+    }
+}

Scripts/Gameplay/Crafting/Item.cs.uid

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+uid://dpq18vk7hbakh

Scripts/Gameplay/Crafting/ItemData.cs

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+using System.Collections.Generic;
+using System.Text.Json.Serialization;
+
+public class ItemData
+{
+    [JsonPropertyName("id")]
+    public string Id { get; set; }
+
+    [JsonPropertyName("inputs")]
+    public List<Ingredient> Inputs { get; set; }
+
+    [JsonPropertyName("output")]
+    public Ingredient Output { get; set; }
+
+    [JsonPropertyName("workstation")]
+    public string Workstation { get; set; }
+
+    [JsonPropertyName("texture")]
+    public string Texture { get; set; }
+
+    [JsonPropertyName("research")]
+    public string Research { get; set; }
+
+    [JsonPropertyName("crafttime")]
+    public double CraftTime { get; set; }
+
+    [JsonPropertyName("stacksize")]
+    public int StackSize { get; set; }
+
+    public string GetReadableName()
+    {
+        string noUnderscore = Id.Replace("_", " ").ToLower();
+        return char.ToUpper(noUnderscore[0]) + noUnderscore.Substring(1);
+    }
+
+    public static string GetReadableName(string input)
+    {
+        string noUnderscore = input.Replace("_", " ").ToLower();
+        return char.ToUpper(noUnderscore[0]) + noUnderscore.Substring(1);
+    }
+
+    public static string GetIndex(string readable)
+    {
+        return readable.ToLower().Replace(" ", "_");
+    }
+
+    public string GetCraftingDisplay()
+    {
+        string result = GetReadableName() + ": \r";
+
+        foreach (Ingredient ingredient in Inputs)
+        {
+            result += $"{GetReadableName(ingredient.Item)} ({ingredient.Amount}),\r";
+        }
+
+        if (Inputs.Count <= 0) return result;
+
+        result = result.Remove(result.Length - 2);
+        return result;
+    }
+}

Scripts/Gameplay/Crafting/ItemData.cs.uid

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+uid://cj8yubkrsdq70