add steam overlay, achievements and stats managers

core/steam_manager/stats_manager.gd

@@ -0,0 +1,62 @@
+extends Node
+
+#Achievement e statistiche devono essere pubblicati live nel backend
+#Steamworks anche se il gioco non è ancora uscito altrimenti le chiamate ritornano errore
+const KNOWN := [
+	"stat_games_played",
+	"stat_total_score",
+	"stat_distance_km",
+]
+
+#how it works:
+#func _on_match_finished(score: int) -> void:
+#    Stats.add_int("stat_games_played", 1)
+#    Stats.set_int("stat_total_score", Stats.get_int("stat_total_score") + score)
+#    Stats.store()                       #only one push at the end of the game
+#    if Stats.get_int("stat_games_played") >= 10:
+#        Achievements.unlock("ACH_PLAY_10_GAMES")   #it call storeStats()
+
+func _ready() -> void:
+	if not SteamManager.is_on_steam:
+		return
+
+	Steam.user_stats_stored.connect(_on_stats_stored)
+
+func get_int(stat: String) -> int:
+	return Steam.getStatInt(stat)
+
+func get_float(stat: String) -> float:
+	return Steam.getStatFloat(stat)
+
+func set_int(stat: String, value: int) -> void:
+	if not KNOWN.has(stat):
+		push_warning("Stat not found: %s" % stat)
+		return
+	if not Steam.setStatInt(stat, value):
+		push_error("setStatInt failed (incremental with value less than current value? is published on steam?): %s" % stat)
+		
+func set_float(stat: String, value: float) -> void:
+	if not KNOWN.has(stat):
+		push_warning("Stat not found: %s" % stat)
+		return
+	if not Steam.setStatFloat(stat, value):
+		push_error("setStatFloat failed: %s" % stat)
+
+func add_int(stat: String, amount: int = 1) -> void:
+	set_int(stat, get_int(stat) + amount)
+
+func update_avg_rate(stat: String, count_this_session: float, session_length: float) -> void:
+	Steam.updateAvgRateStat(stat, count_this_session, session_length)
+
+#Send all data to server; call it at the end of the game of when exit
+func store() -> void:
+	if not Steam.storeStats():
+		push_error("storeStats failed; data saved locally")
+
+#Development only: reset stats
+func reset_all(include_achievements: bool = false) -> void:
+	Steam.resetAllStats(include_achievements)
+	Steam.storeStats()
+
+func _on_stats_stored(_game: int, result: int) -> void:
+	print("Stats save on server, result=%d" % result)