extends CanvasLayer
## The quartermaster: spend a level-up, and review what you have taken.
##
## The three options are the SERVER's, held on the character until one is
## spent -- closing and reopening this screen shows the same three, because
## otherwise it would be a reroll button and everyone would press it until a
## legendary appeared.
##
## The brief asked for a separate screen listing upgrades already taken. It is
## the lower half of this one instead: the two are read together (what do I
## have, what should I add) and splitting them would mean closing one panel to
## answer a question raised by the other.

signal choose_requested(index: int)
signal closed

const RARITY_COLOURS := {
	UpgradeDef.Rarity.COMMON: Color(0.72, 0.76, 0.84),
	UpgradeDef.Rarity.UNCOMMON: Color(0.55, 0.85, 0.6),
	UpgradeDef.Rarity.RARE: Color(0.55, 0.7, 1.0),
	UpgradeDef.Rarity.LEGENDARY: Color(1.0, 0.72, 0.3),
}

var _title: Label
var _cards: HBoxContainer
var _taken: Label
var _summary: Label
var _status: Label


func _ready() -> void:
	layer = 28
	visible = false
	var root := Control.new()
	root.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	add_child(root)

	var scrim := ColorRect.new()
	scrim.color = Color(0.03, 0.03, 0.06, 0.9)
	scrim.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	root.add_child(scrim)

	var centre := CenterContainer.new()
	centre.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	root.add_child(centre)

	var panel := VBoxContainer.new()
	panel.custom_minimum_size = Vector2(760.0, 0.0)
	panel.add_theme_constant_override("separation", 10)
	centre.add_child(panel)

	_title = Label.new()
	_title.add_theme_font_size_override("font_size", 26)
	panel.add_child(_title)

	_cards = HBoxContainer.new()
	_cards.add_theme_constant_override("separation", 10)
	panel.add_child(_cards)

	_status = Label.new()
	_status.add_theme_color_override("font_color", Color(1.0, 0.6, 0.5))
	panel.add_child(_status)

	panel.add_child(_rule())

	var taken_title := Label.new()
	taken_title.text = "ALREADY TAKEN"
	taken_title.add_theme_font_size_override("font_size", 15)
	taken_title.add_theme_color_override("font_color", Color(0.6, 0.65, 0.78))
	panel.add_child(taken_title)

	_taken = Label.new()
	_taken.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	_taken.custom_minimum_size = Vector2(740.0, 0.0)
	panel.add_child(_taken)

	_summary = Label.new()
	_summary.add_theme_color_override("font_color", Color(0.65, 0.72, 0.85))
	_summary.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	_summary.custom_minimum_size = Vector2(740.0, 0.0)
	panel.add_child(_summary)

	var close := Button.new()
	close.text = "Close  (E)"
	close.custom_minimum_size = Vector2(160.0, 34.0)
	close.pressed.connect(func() -> void: closed.emit())
	panel.add_child(close)


func _rule() -> Control:
	var line := ColorRect.new()
	line.color = Color(0.2, 0.22, 0.3)
	line.custom_minimum_size = Vector2(0.0, 1.0)
	return line


func set_status(text: String) -> void:
	_status.text = text


## Rebuild from the server's numbers. Called on every upgrade change, so the
## screen can never show an offer that has already been spent.
func refresh(pending: int, offer: Array[StringName], taken: Array[StringName]) -> void:
	_status.text = ""
	if pending > 0:
		_title.text = "CHOOSE AN UPGRADE   (%d waiting)" % pending
	else:
		_title.text = "QUARTERMASTER   —   nothing to spend"
	for child in _cards.get_children():
		child.queue_free()
	if pending > 0:
		for i in offer.size():
			_cards.add_child(_make_card(i, offer[i]))
	_taken.text = _taken_text(taken)
	_summary.text = _summary_text(taken)


func _make_card(index: int, id: StringName) -> Control:
	var def := Upgrades.get_def(id)
	var card := VBoxContainer.new()
	card.custom_minimum_size = Vector2(240.0, 0.0)
	card.add_theme_constant_override("separation", 6)
	if def == null:
		return card
	var tint: Color = RARITY_COLOURS.get(def.rarity, Color.WHITE)

	var name_label := Label.new()
	name_label.text = def.display_name
	name_label.add_theme_font_size_override("font_size", 18)
	name_label.add_theme_color_override("font_color", tint)
	card.add_child(name_label)

	var rarity := Label.new()
	rarity.text = UpgradeDef.rarity_name(def.rarity).to_upper()
	rarity.add_theme_font_size_override("font_size", 11)
	rarity.add_theme_color_override("font_color", Color(tint, 0.7))
	card.add_child(rarity)

	var body := Label.new()
	body.text = def.description
	body.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	body.custom_minimum_size = Vector2(230.0, 96.0)
	body.add_theme_font_size_override("font_size", 13)
	card.add_child(body)

	# Shown on every card because it applies to every card. Deliberately NOT
	# labelled "every upgrade": that a flat bonus rides along with all of them
	# is a design principle, and the player only needs the number.
	var bonus := Label.new()
	bonus.text = "+%d%% damage" % roundi(SimConfig.UPGRADE_DAMAGE_BONUS * 100.0)
	bonus.add_theme_font_size_override("font_size", 12)
	bonus.add_theme_color_override("font_color", Color(0.55, 0.8, 0.6))
	card.add_child(bonus)

	var take := Button.new()
	take.text = "Take"
	take.custom_minimum_size = Vector2(0.0, 34.0)
	take.pressed.connect(func() -> void: choose_requested.emit(index))
	card.add_child(take)
	return card


## Counted rather than listed one per line: "Split Shot x3" is the number that
## matters, and a level 15 character has fourteen of these.
func _taken_text(taken: Array[StringName]) -> String:
	if taken.is_empty():
		return "nothing yet"
	var counts := {}
	var order: Array[StringName] = []
	for id in taken:
		if not counts.has(id):
			counts[id] = 0
			order.append(id)
		counts[id] += 1
	var parts: Array[String] = []
	for id in order:
		var def := Upgrades.get_def(id)
		var name_text := def.display_name if def != null else String(id)
		parts.append("%s x%d" % [name_text, int(counts[id])] if int(counts[id]) > 1
			else name_text)
	return "   ".join(parts)


## What the upgrades actually add up to. Built through PlayerStats, the same
## class the server fires with, so this cannot drift from the real numbers.
func _summary_text(taken: Array[StringName]) -> String:
	var s := PlayerStats.build(taken)
	var shots := 1 + s.side_shots + s.parallel_shots
	var per_second := float(SimConfig.TICK_RATE) / float(s.fire_cooldown)
	var parts: Array[String] = [
		"%d damage per shot" % s.damage,
		"%.1f shots/sec" % per_second,
		"%d projectile%s per shot" % [shots, "" if shots == 1 else "s"],
		"%d bullet speed%s" % [roundi(s.bullet_speed),
			" (capped)" if s.speed_capped else ""],
	]
	if s.max_hp_mult != 1.0:
		parts.append("%d%% max health" % roundi(s.max_hp_mult * 100.0))
	if s.split_charges > 0:
		parts.append("splits %dx" % s.split_charges)
	if s.poison_fraction > 0.0:
		parts.append("+%d%% as poison" % roundi(s.poison_fraction * 100.0))
	if s.erase_chance > 0.0:
		parts.append("%.1f%% erase" % (s.erase_chance * 100.0))
	return "   ·   ".join(parts)