class_name ShopPanel
extends Control

## Unten: Shop, Würfeln, Einfrieren, Futter und Hinweise.

signal buy_requested(index: int, quick: bool)
signal reroll_pressed
signal lock_pressed
signal card_hovered(index: int, screen_pos: Vector2)
signal card_left
signal undo_pressed

const PANEL_BG := Color(0.14, 0.15, 0.19)
const SLOT_BG := Color(0.20, 0.21, 0.26)

var row: HBoxContainer
var btn_reroll: Button
var btn_lock: Button
var lbl_fodder: Label
var lbl_hint: Label
var lbl_tip: Label   ## Erstrunden-Hilfe
var btn_undo: Button ## Rückgängig nach einem Verkauf, verschwindet nach 5 s


func build(x: float, y: float, w: float, h: float) -> void:
	position = Vector2(x, y)
	size = Vector2(w, h)
	mouse_filter = Control.MOUSE_FILTER_IGNORE
	var p := UiKit.panel(PANEL_BG)
	p.size = size
	add_child(p)
	var v := VBoxContainer.new()
	v.add_theme_constant_override("separation", 6)
	p.add_child(v)

	var head := HBoxContainer.new()
	head.add_theme_constant_override("separation", 14)
	v.add_child(head)
	head.add_child(UiKit.label("Shop", 13, Color(0.7, 0.72, 0.8)))
	btn_reroll = UiKit.button("Neu würfeln  %d Gold  [D]" % Data.REROLL_COST, Color(0.30, 0.32, 0.44))
	btn_reroll.custom_minimum_size = Vector2(200, 26)
	btn_reroll.pressed.connect(func(): reroll_pressed.emit())
	head.add_child(btn_reroll)
	btn_lock = UiKit.button("Einfrieren  [F]", Color(0.30, 0.38, 0.50))
	btn_lock.custom_minimum_size = Vector2(150, 26)
	btn_lock.pressed.connect(func(): lock_pressed.emit())
	head.add_child(btn_lock)
	lbl_fodder = UiKit.label("", 13, Color(0.7, 0.72, 0.8))
	head.add_child(lbl_fodder)
	lbl_hint = UiKit.label("", 13, Color(0.95, 0.85, 0.45))
	head.add_child(lbl_hint)
	lbl_tip = UiKit.label("", 13, Color(0.6, 0.95, 0.75))
	head.add_child(lbl_tip)
	btn_undo = UiKit.button("Verkauf rückgängig  [Z]", Color(0.55, 0.40, 0.25))
	btn_undo.custom_minimum_size = Vector2(210, 26)
	btn_undo.visible = false
	btn_undo.pressed.connect(func(): undo_pressed.emit())
	head.add_child(btn_undo)
	var spacer := Control.new()
	spacer.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	head.add_child(spacer)
	head.add_child(UiKit.label(
		"Ziehen: Bank ↔ Feld  ·  Rechtsklick: verkaufen / zurück  ·  Rechtsklick auf Neutral: wie zuletzt",
		13, Color(0.6, 0.62, 0.7)))

	row = HBoxContainer.new()
	row.add_theme_constant_override("separation", 8)
	v.add_child(row)


func refresh(game: Game) -> void:
	var p := game.human
	for c in row.get_children():
		row.remove_child(c)
		c.queue_free()
	for i in p.shop.size():
		var e: ShopEntry = p.shop[i]
		var b: Button
		if e.sold:
			b = UiKit.button("verkauft", SLOT_BG.darkened(0.3))
			b.disabled = true
		else:
			var col := e.color()
			var note: String
			if e.element < 0:
				note = "Element wählen"
				if p.last_element >= 0:
					note += "\nRechtsklick: %s" % Data.ELEMENT_NAMES[p.last_element]
			else:
				note = "noch %d im Vorrat" % game.pool.element_left[e.element]
			b = UiKit.button("[%d]  %s\n%d Gold\n%s" % [i + 1, e.label(), e.price(), note], col, UiKit.ink(col))
			b.disabled = p.gold < e.price() or game.phase != Game.Phase.PLANNING
			b.gui_input.connect(_on_card_input.bind(i))
			b.mouse_entered.connect(func(): card_hovered.emit(i, b.global_position + Vector2(b.size.x, -8.0)))
			b.mouse_exited.connect(func(): card_left.emit())
		b.custom_minimum_size = Vector2(196, 88)
		row.add_child(b)
	var mine := []
	for el in p.shop_elements(game.pool):
		mine.append("%s %d" % [Data.ELEMENT_NAMES[el], game.pool.element_left[el]])
	row.add_child(UiKit.label("   Dein Shop zeigt Neutral\n   und deine Elemente:\n   %s"
		% [", ".join(mine) if mine else "noch keine aufgestellt"], 12, Color(0.7, 0.72, 0.8)))

	var fodder := p.fodder_counts()
	var parts := []
	for e in fodder:
		parts.append("%dx %s" % [fodder[e], Data.ELEMENT_NAMES[e]])
	lbl_fodder.text = "Futter: " + (", ".join(parts) if parts else "-")
	btn_lock.text = "Eingefroren  [F]" if p.shop_locked else "Einfrieren  [F]"
	btn_lock.add_theme_stylebox_override("normal",
		UiKit.flat(Color(0.35, 0.55, 0.75) if p.shop_locked else Color(0.30, 0.38, 0.50)))
	btn_reroll.disabled = game.phase != Game.Phase.PLANNING or p.gold < Data.REROLL_COST


func _on_card_input(event: InputEvent, index: int) -> void:
	if event is InputEventMouseButton and event.pressed:
		if event.button_index == MOUSE_BUTTON_LEFT:
			buy_requested.emit(index, false)
		elif event.button_index == MOUSE_BUTTON_RIGHT:
			buy_requested.emit(index, true)


func hint(text: String) -> void:
	lbl_hint.text = text
	get_tree().create_timer(2.5).timeout.connect(func():
		if is_instance_valid(lbl_hint) and lbl_hint.text == text:
			lbl_hint.text = "")


## Zeigt den Rückgängig-Knopf für fünf Sekunden.
func show_undo() -> void:
	btn_undo.visible = true
	get_tree().create_timer(5.0).timeout.connect(func():
		if is_instance_valid(btn_undo):
			btn_undo.visible = false)


func hide_undo() -> void:
	btn_undo.visible = false