First commit

game_state.gd

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+extends Node
+# This script is added as an Autoload named 'GameState'
+
+# ==========================================
+# SIGNALS
+# ==========================================
+signal gold_changed(new_amount: BigNumber)
+signal gems_changed(new_amount: BigNumber)
+
+enum CurrencyType { gold, gems }
+
+# ==========================================
+# STATE VARIABLES
+# ==========================================
+var gold: BigNumber = BigNumber.from_float(0.0)
+var gems: BigNumber = BigNumber.from_float(0.0)
+
+var last_save_time: int = 0 # Unix timestamp
+
+static var file_name: String = "user://idle_save.json"
+
+func _ready() -> void:
+	load_game()
+
+# ==========================================
+# STATE MODIFIERS
+# ==========================================
+func add_gold(amount: BigNumber) -> void:
+	gold.add_in_place(amount)
+	gold_changed.emit(gold)
+
+func spend_gold(cost: BigNumber) -> bool:
+	if gold.is_greater_than(cost) or gold.is_equal_to(cost):
+		var negative_cost = BigNumber.new(-cost.mantissa, cost.exponent)
+		gold.add_in_place(negative_cost)
+		gold_changed.emit(gold)
+		return true
+	return false
+
+func add_gems(amount: BigNumber) -> void:
+	gems.add_in_place(amount)
+	gems_changed.emit(gems)
+
+func spend_gems(cost: BigNumber) -> bool:
+	if gems.is_greater_than(cost) or gems.is_equal_to(cost):
+		var negative_cost = BigNumber.new(-cost.mantissa, cost.exponent)
+		gems.add_in_place(negative_cost)
+		gems_changed.emit(gems)
+		return true
+	return false
+
+# ==========================================
+# PERSISTENCE (Save/Load)
+# ==========================================
+func save_game() -> void:
+	var save_data = {
+		"gold": gold.serialize(),
+		"gems": gems.serialize(),
+		"last_save_time": Time.get_unix_time_from_system()
+	}
+	
+	var file = FileAccess.open(file_name, FileAccess.WRITE)
+	if file:
+		file.store_string(JSON.stringify(save_data))
+
+func load_game() -> void:
+	if not FileAccess.file_exists(file_name):
+		return
+		
+	var file = FileAccess.open(file_name, FileAccess.READ)
+	if file:
+		var parsed = JSON.parse_string(file.get_as_text())
+		if parsed is Dictionary:
+			gold = BigNumber.deserialize(parsed.get("gold", {}))
+			gems = BigNumber.deserialize(parsed.get("gems", {}))
+			last_save_time = parsed.get("last_save_time", Time.get_unix_time_from_system())