@tool
class_name CabinetPCBConfig
extends Resource

# This resource describes wiring. It never configures or writes GPIO.
@export var connections: Array[PCBConnection] = []

const TYPES := {
	"rfid": "RFID reader", "button": "Button / switch", "sensor": "Digital sensor",
	"led": "LED / lighting driver", "motor": "Motorized switch / motor driver",
	"relay": "Relay / MOSFET module", "i2c": "I2C peripheral", "other": "Other (document wiring)"
}

static func ports() -> Array[Dictionary]:
	var result: Array[Dictionary] = []
	for index in range(8):
		result.append({"id": "J%d" % (index + 1), "family": "reader", "label": "%d%d%d" % [(index >> 2) & 1, (index >> 1) & 1, index & 1], "pins": "Selector: BCM22=%d, BCM27=%d, BCM17=%d\nShared reset: BCM20. Reader connector contact pinout is not documented." % [(index >> 2) & 1, (index >> 1) & 1, index & 1], "types": ["rfid", "other"], "bcm": -1})
	result.append({"id": "J9", "family": "host", "label": "Pi ribbon", "pins": "Host GPIO ribbon connector. Confirm pin-1 orientation against the physical board.", "types": [], "bcm": -1})
	var signals := [5, 6, 13, 19, 26, 21]
	for index in range(6):
		result.append({"id": "J%d" % (10 + index), "family": "powered", "label": "BCM%d" % signals[index], "pins": "1 GND (black) | 2 3V3 (red) | 3 signal (yellow)\nBCM%d" % signals[index], "types": ["button", "sensor", "led", "motor", "relay", "other"], "bcm": signals[index]})
	result.append({"id": "J16", "family": "i2c", "label": "I2C1", "pins": "1 GND (black) | 2 3V3 (red) | 3 SCL (white) | 4 SDA (yellow)", "types": ["i2c", "other"], "bcm": -1})
	signals = [16, 12, 24, 23, 18, 25]
	for index in range(6):
		result.append({"id": "J%d" % (17 + index), "family": "signal", "label": "BCM%d" % signals[index], "pins": "1 GND (black) | 2 signal (red)\nBCM%d - red is signal, not a power supply." % signals[index], "types": ["button", "sensor", "led", "motor", "relay", "other"], "bcm": signals[index]})
	return result

static func port(id: String) -> Dictionary:
	for definition in ports():
		if definition.id == id:
			return definition
	return {}

func connection(id: String) -> PCBConnection:
	for item in connections:
		if item != null and item.port_id == id:
			return item
	return null

func set_connection(item: PCBConnection) -> void:
	for index in range(connections.size() - 1, -1, -1):
		if connections[index] != null and connections[index].port_id == item.port_id:
			connections.remove_at(index)
	if not item.device_type.is_empty():
		connections.append(item)
	emit_changed()

func issues(hardware: HardwareConfig = null) -> PackedStringArray:
	var messages := PackedStringArray()
	var used_ports: Dictionary = {}
	var used_ids: Dictionary = {}
	for item in connections:
		if item == null:
			messages.append("Empty connection resource.")
			continue
		var definition := port(item.port_id)
		if definition.is_empty() or not definition.types.has(item.device_type):
			messages.append("%s: unsupported connector/device combination." % item.port_id)
		if used_ports.has(item.port_id):
			messages.append("%s: connector is assigned more than once." % item.port_id)
		used_ports[item.port_id] = true
		if item.device_id.strip_edges().is_empty():
			messages.append("%s: enter a device ID." % item.port_id)
		elif used_ids.has(item.device_id):
			messages.append("Duplicate device ID: %s." % item.device_id)
		used_ids[item.device_id] = true
		if item.device_type in ["led", "motor", "relay"] and not item.binding_id.is_empty():
			var action: HardwareAction = hardware.get_action(StringName(item.binding_id)) if hardware else null
			if action == null:
				messages.append("%s: hardware action '%s' does not exist." % [item.port_id, item.binding_id])
			elif not definition.is_empty() and action.gpio_pin != definition.bcm:
				messages.append("%s: action uses BCM%d, but connector uses BCM%d." % [item.port_id, action.gpio_pin, definition.bcm])
	if hardware:
		for action in hardware.actions:
			if action != null and action.gpio_pin in [17, 27, 22, 20]:
				messages.append("Action '%s' uses reserved PCB selector/reset BCM%d." % [action.action_id, action.gpio_pin])
	return messages

func feedback_devices() -> Array[Dictionary]:
	var result: Array[Dictionary] = []
	for item in connections:
		if item == null:
			continue
		var kind := ""
		if item.device_type == "rfid": kind = "rfid"
		elif item.device_type in ["button", "sensor"]: kind = "input"
		elif item.device_type in ["led", "motor", "relay"]: kind = "output"
		else:
			push_warning("Feedback driver not implemented for %s (%s)" % [item.device_id, item.device_type])
			continue
		result.append({"id": item.device_id, "name": item.display_name, "port": item.port_id, "kind": kind, "pull_up": item.input_pull_up})
	return result