class_name SimulatedHardwareBackend
extends RefCounted


signal pin_state_changed(
	cabinet_id: StringName,
	gpio_pin: int,
	active: bool,
	action_id: StringName,
	context: Dictionary
)

signal trace_entry_created(
	entry: Dictionary
)


var pin_states: Dictionary = {}


func reset() -> void:

	pin_states.clear()


func activate_action(
	cabinet_id: StringName,
	action: HardwareAction,
	context: Dictionary
) -> void:

	if action == null:
		return

	var gpio_active := action.active_high

	_set_pin_state(
		cabinet_id,
		action,
		gpio_active,
		true,
		context
	)


func deactivate_action(
	cabinet_id: StringName,
	action: HardwareAction,
	context: Dictionary
) -> void:

	if action == null:
		return

	var gpio_active := not action.active_high

	_set_pin_state(
		cabinet_id,
		action,
		gpio_active,
		false,
		context
	)


func _set_pin_state(
	cabinet_id: StringName,
	action: HardwareAction,
	electrical_state: bool,
	logical_active: bool,
	context: Dictionary
) -> void:

	var key := "%s::%d" % [
		cabinet_id,
		action.gpio_pin
	]

	pin_states[key] = electrical_state

	var entry := {
		"type": &"gpio",
		"cabinet_id": cabinet_id,
		"action_id": action.action_id,
		"gpio_pin": action.gpio_pin,
		"electrical_state": electrical_state,
		"logical_active": logical_active,
		"active_high": action.active_high,
		"context": context.duplicate(),
	}

	trace_entry_created.emit(
		entry
	)

	pin_state_changed.emit(
		cabinet_id,
		action.gpio_pin,
		logical_active,
		action.action_id,
		context
	)