Enhance save system functionality; improve game state management and session tracking

autoloads/save_system.gd

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+extends Node
+
+@export var save_path: String = "user://savegame.save"
+@export var version: int = 1
+
+@onready var gm: GM = $"/root/GameManager"
+
+
+func save_game():
+	var save_data := {
+						 "player_state": gm.player_state,
+						 "version": version,
+					 }
+	var file      := FileAccess.open(save_path, FileAccess.WRITE)
+	file.store_var(save_data)
+	file.close()
+	print("Game saved to: ", save_path)
+
+
+func load_game() -> bool:
+	if not FileAccess.file_exists(save_path):
+		return false
+	var file                  := FileAccess.open(save_path, FileAccess.READ)
+	var save_data: Dictionary =  file.get_var()
+	file.close()
+
+	if save_data.has("version") and save_data["version"] != version:
+		print("Save file version mismatch. Expected: ", version, ", Found: ", save_data["version"])
+		return false
+
+	print("save data: ", save_data)
+	gm.player_state = save_data["player_state"]
+	print("Player state loaded: ", gm.player_state)
+	var skills: Array[String] = []
+	for skill_name in gm.player_state["unlocked_skills"]:
+		skills.append(skill_name)
+
+	print("Newly unlocked skills: ", skills)
+	gm.unlock_skills(skills)
+	print("Game loaded from: ", save_path)
+	return true
+
+
+func check_save_exists() -> bool:
+	return FileAccess.file_exists(save_path)

autoloads/save_system.gd.uid

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+uid://d3tgf7fyr6xek