class_name ResourceBar
extends Control

# The header every building menu now carries (#24): banked ore, what the
# fleet is holding, and what THIS building has. Before this, each panel
# improvised its own - the crafter spelled the same three figures into a
# run-on StatusLabel string, the research screen printed a bank total inside
# a button caption - so the same numbers looked different in every room.
#
# Three columns rather than a sentence, because the point of the bar is that
# a figure stays in the same place as the player moves between menus.
#
# Reads GameState directly every frame, like ResourceCounter and CargoCounter
# do, so it stays correct across the space <-> planet-surface scene swap with
# nobody having to push updates into it. Only `building_id` is pushed in,
# because "here" is the one thing the bar cannot work out for itself.

# Which building the HERE column is reporting. 0 means none, which greys the
# column rather than showing a confident zero.
var building_id: int = 0

# The caption box has to be a full line tall, not just the font size: a Label
# renders its line height, not its point size, and the first version sat the
# digits 26px down from the top straight through the middle of the caption.
const CAPTION_HEIGHT: float = 34.0
const CAPTION_GAP: float = 4.0
const CAPTION_FONT_SIZE: int = 24
const DIGIT_HEIGHT: float = 34.0

# Bank keeps NeonNumber's own ore-teal, and the hold keeps the amber
# CargoCounter established for ore in transit. Only HERE needed a new colour;
# it borrows the mothership's green, which already reads as "landed
# somewhere and staying there" everywhere else in the game.
const BANK_GLOW: Color = Color(0.0, 0.62, 0.7)
const BANK_CORE: Color = Color(0.0, 0.12, 0.15)
const HOLD_GLOW: Color = Color(1.0, 0.78, 0.25)
const HOLD_CORE: Color = Color(0.22, 0.12, 0.0)
const HERE_GLOW: Color = Color(0.45, 0.9, 0.55)
const HERE_CORE: Color = Color(0.05, 0.16, 0.08)
const RULE_COLOR: Color = Color(0.25, 0.55, 0.7)

var _numbers: Array[NeonNumber] = []
var _captions: Array[Label] = []


func _ready() -> void:
	mouse_filter = Control.MOUSE_FILTER_IGNORE
	var columns: Array = [
		["BANK", BANK_GLOW, BANK_CORE],
		["HOLD", HOLD_GLOW, HOLD_CORE],
		["HERE", HERE_GLOW, HERE_CORE],
	]
	for column in columns:
		var caption: Label = Label.new()
		caption.text = column[0]
		caption.mouse_filter = Control.MOUSE_FILTER_IGNORE
		caption.add_theme_font_size_override("font_size", CAPTION_FONT_SIZE)
		caption.add_theme_color_override("font_color", column[1])
		add_child(caption)
		_captions.append(caption)

		var number: NeonNumber = NeonNumber.new()
		number.mouse_filter = Control.MOUSE_FILTER_IGNORE
		number.glow_color = column[1]
		number.core_color = column[2]
		number.digit_height = DIGIT_HEIGHT
		add_child(number)
		_numbers.append(number)

	_layout()
	resized.connect(_layout)


func _layout() -> void:
	var column_width: float = size.x / float(_numbers.size())
	for i in _numbers.size():
		var x: float = column_width * float(i)
		_captions[i].position = Vector2(x, 0.0)
		_captions[i].size = Vector2(column_width, CAPTION_HEIGHT)
		# The hexagon and digits are drawn from the node's own origin, so the
		# number is positioned rather than sized.
		_numbers[i].position = Vector2(x, CAPTION_HEIGHT + CAPTION_GAP)


func _process(_delta: float) -> void:
	_numbers[0].set_amount(GameState.rocks)
	_numbers[1].set_amount(GameState.fleet_cargo)

	# A building with no id is not a building: showing "0" there would claim
	# the store is empty rather than that there is no store to look at.
	var known: bool = building_id != 0
	_numbers[2].visible = known
	_captions[2].visible = known
	if known:
		_numbers[2].set_amount(GameState.building_holdings(building_id))


# The height the bar needs for a caption line and a row of digits. The scene
# sizes the node, so this is what those offsets have to add up to; anything
# less and the rule is drawn back through the digits.
static func natural_height() -> float:
	return CAPTION_HEIGHT + CAPTION_GAP + DIGIT_HEIGHT + 8.0


func _draw() -> void:
	# One rule under the whole bar, so the header reads as a band separating
	# the standing figures from whatever the panel below them does.
	var rule_y: float = maxf(size.y, natural_height())
	NeonDraw.draw_glowing_line(
		self, Vector2(0.0, rule_y), Vector2(size.x, rule_y), RULE_COLOR, 0.55, 1.0
	)