Merge branch 'save-system' of https://github.com/CybernetHacker14/open-project-1 into CybernetHacker14-save-system

UOP1_Project/Assets/Scripts/SaveSystem.meta

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UOP1_Project/Assets/Scripts/SaveSystem/Save.cs

+/// <summary>
+/// <b>DO NOT DELETE THIS FILE !!!!!!</b><br/>
+/// This class contains all the variables that will be serialized and saved to a binary file.<br/>
+/// Can be considered as a save file structure or format.
+/// </summary>
+[System.Serializable]
+public class Save {
+	// This is test data, written accodring to TestScript.cs class
+	// This will change according to whatever data that needs to be stored
+
+	// The variables need to be public, else we would have to write trivial getter/setter functions.
+
+	public int _testInteger = default;
+	public float _testFloat = default;
+	public bool _testBool = default;
+}

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UOP1_Project/Assets/Scripts/SaveSystem/SaveSystem.cs.meta

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UOP1_Project/Assets/Scripts/SaveSystem/TestScript.meta

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UOP1_Project/Assets/Scripts/SaveSystem/TestScript/TestScript.cs

+using System.Collections.Generic;
+using UnityEngine;
+
+/// <summary>
+/// A test script showing usage of the save system.<br/>
+/// This code corresponds to the code written in <see cref="Save"/> class.<br/>
+/// Unfortunately, inspite of all my efforts, I wasn't able to remove all dependencies. 
+/// </summary>
+public class TestScript : MonoBehaviour, ISaveable
+{
+	int _testInteger = default;
+	float _testFloat = default;
+	bool _testBool = default;
+
+	private void OnEnable()
+	{
+		// This is necessary, otherwise the object won't get added to registry of objects which needs to be serialized
+		SaveSystem.AddToRegistry += AddToSaveRegistry;
+	}
+
+	private void OnDisable()
+	{
+		SaveSystem.AddToRegistry -= AddToSaveRegistry;
+	}
+
+	public void AddToSaveRegistry(HashSet<ISaveable> registry)
+	{
+		registry.Add(this);
+	}
+
+	public void Serialize(Save saveFile)
+	{
+		saveFile._testInteger = _testInteger;
+		saveFile._testFloat = _testFloat;
+		saveFile._testBool = _testBool;
+	}
+
+	public void Deserialize(Save saveFile)
+	{
+		_testInteger = saveFile._testInteger;
+		_testFloat = saveFile._testFloat;
+		_testBool = saveFile._testBool;
+	}
+}

UOP1_Project/Assets/Scripts/SaveSystem/TestScript/TestScript.cs.meta

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UOP1_Project/Assets/Scripts/SaveSystem/SaveSystem.cs

+using UnityEngine;
+using UnityEditor;
+using System.IO;
+using System.Collections.Generic;
+using System.Runtime.Serialization.Formatters.Binary;
+
+
+public interface ISaveable
+{
+
+	/// <summary>
+	/// <para>The function which needs to be subscribed to the <see cref="SaveSystem.AddToRegistryCallback"/></para>
+	/// Include it in a place which only gets executed once to avoid data duplication.<br/>
+	/// Like in OnEnable() function of Monobehaviour or ScriptableObject
+	/// </summary>
+	void AddToSaveRegistry(HashSet<ISaveable> registry);
+
+	/// <summary>
+	/// Pure virtual function for saving data to a save file.<br/>
+	/// This will comprise the serialization logic.
+	/// </summary>
+	void Serialize(Save saveFile);
+
+	/// <summary>
+	/// Pure virtual function for loading data from a save file.<br/>
+	/// This will comprise the deserialziation logic.
+	/// </summary>
+	void Deserialize(Save saveFile);
+}
+
+public class SaveSystem : MonoBehaviour
+{
+	public delegate void AddToRegistryCallback(HashSet<ISaveable> registry);
+	public static AddToRegistryCallback AddToRegistry;
+
+	HashSet<ISaveable> _saveRegistry = default;
+
+	[SerializeField]
+	string _fileNameExtension;
+
+	private void Start()
+	{
+		Debug.Log("SaveSystem start getting called");
+		_saveRegistry = new HashSet<ISaveable>();
+		AddToRegistry?.Invoke(_saveRegistry);
+		LoadGame();
+	}
+
+	private void LoadGame()
+	{
+		FileStream file;
+
+		if(!File.Exists(Application.persistentDataPath + "/save" + _fileNameExtension))
+		{
+			Debug.LogError("No Save Data found");
+			return;
+
+		} else
+		{
+			file = File.Open(Application.persistentDataPath + "/save" + _fileNameExtension, FileMode.Open);
+		}
+
+		BinaryFormatter formatter = new BinaryFormatter();
+
+		Save saveClass = (Save)formatter.Deserialize(file);
+
+		file.Close();
+
+		foreach(ISaveable saveable in _saveRegistry)
+		{
+			saveable.Deserialize(saveClass);
+		}
+	}
+
+	private void SaveAndQuit()
+	{
+		SaveGame();
+		Application.Quit();
+	}
+
+	private void SaveGame()
+	{
+		FileStream file;
+
+		if(!File.Exists(Application.persistentDataPath + "/save" + _fileNameExtension))
+		{
+			file = File.Create(Application.persistentDataPath + "/save" + _fileNameExtension);
+
+		} else
+		{
+			file = File.Open(Application.persistentDataPath + "/save" + _fileNameExtension, FileMode.Open);
+		}
+
+		// A class with name "Save" must exist in the project. It will contain the appropriate save file structure.
+		Save saveClass = new Save();
+
+		foreach(ISaveable saveable in _saveRegistry)
+		{
+			saveable.Serialize(saveClass);
+		}
+
+		BinaryFormatter formatter = new BinaryFormatter();
+		formatter.Serialize(file, saveClass);
+		file.Close();
+	}
+
+	private void OnDisable()
+	{
+		SaveAndQuit();
+	}
+
+}