add ai, photo_mode and radio

core/ai/framework/state_machine.gd

@@ -0,0 +1,61 @@
+extends Node
+
+class_name StateMachine
+
+@export var initial_state: State
+
+var current_state: State
+var states: Dictionary[StringName, State] = {}
+var is_initialized: bool = false
+var _enabled: bool = true
+var enable: bool:
+	set(value):
+		_enabled = value
+		_set_enabled(value)
+	get:
+		return _enabled
+
+func _ready() -> void:
+	_initialize_states()
+	_set_enabled(enable)
+
+func _initialize_states() -> void:
+	if is_initialized:
+		return
+
+	for state in get_children():
+		if state is State:
+			states[state.state_id] = state
+			state.transitioned.connect(_on_state_transition)
+
+	is_initialized = true
+
+func _set_enabled(value: bool) -> void:
+	_enabled = value
+
+	if not _enabled:
+		return
+
+	_initialize_states()
+
+	if initial_state and current_state == null:
+		current_state = initial_state
+		current_state.enter()
+
+func physics_process(delta) -> void:
+	if current_state and _enabled:
+		current_state.physics_update(delta)
+
+func _on_state_transition(state: State, new_state_id: StringName) -> void:
+	if state != current_state:
+		return
+
+	var new_state = states.get(new_state_id)
+	if not new_state:
+		return
+
+	if current_state:
+		current_state.exit()
+	
+	current_state = new_state
+	current_state.enter()