extends VBoxContainer

const Brand := preload("res://scripts/ui/medmind_style.gd")

var main: Control
var balance_label: Label
var inventory_label: Label
var products_box: VBoxContainer
var status_label: Label
var confirm_dialog: ConfirmationDialog
var pending_sku := ""


func _ready() -> void:
	size_flags_horizontal = Control.SIZE_EXPAND_FILL
	size_flags_vertical = Control.SIZE_EXPAND_FILL
	add_theme_constant_override("separation", 18)
	var title := Label.new()
	title.text = "Rz Coin Store"
	title.add_theme_font_override("font", Brand.font)
	title.add_theme_font_size_override("font_size", 30)
	add_child(title)
	var intro := Label.new()
	intro.text = "Spend coins earned from correct, on-time first answers. Purchases use Rz Coins only."
	intro.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	add_child(intro)
	balance_label = Label.new()
	balance_label.add_theme_font_size_override("font_size", 20)
	add_child(balance_label)
	inventory_label = Label.new()
	add_child(inventory_label)
	products_box = VBoxContainer.new()
	products_box.add_theme_constant_override("separation", 12)
	add_child(products_box)
	status_label = Label.new()
	status_label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	add_child(status_label)
	confirm_dialog = ConfirmationDialog.new()
	confirm_dialog.confirmed.connect(_confirm_purchase)
	add_child(confirm_dialog)
	CreditsService.credits_changed.connect(_refresh)
	CreditsService.credits_failed.connect(_show_error)
	CreditsService.store_operation_completed.connect(_show_message)
	_refresh()


func on_show(_payload: Variant = null) -> void:
	CreditsService.refresh()
	_refresh()


func _refresh() -> void:
	balance_label.text = "%d Rz Coins" % CreditsService.credits
	inventory_label.text = "Inventory: %d exam token(s) · %d QBank reset token(s)" % [
		CreditsService.exam_tokens, CreditsService.qbank_reset_tokens]
	for child in products_box.get_children():
		child.queue_free()
	for product_variant in CreditsService.products:
		if typeof(product_variant) != TYPE_DICTIONARY:
			continue
		var product: Dictionary = product_variant
		var card := PanelContainer.new()
		card.add_theme_stylebox_override("panel", Brand.content_card_box(UIThemeService.is_dark_mode(), true, Brand.ROYAL_BLUE))
		var row := HBoxContainer.new()
		row.add_theme_constant_override("separation", 16)
		card.add_child(row)
		var copy := VBoxContainer.new()
		copy.size_flags_horizontal = Control.SIZE_EXPAND_FILL
		var name_label := Label.new()
		name_label.text = str(product.get("name", "Store item"))
		name_label.add_theme_font_size_override("font_size", 19)
		copy.add_child(name_label)
		var description := Label.new()
		description.text = str(product.get("description", ""))
		description.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
		copy.add_child(description)
		row.add_child(copy)
		var buy := Button.new()
		var price := int(product.get("coinPrice", 0))
		buy.text = "Buy · %d coins" % price
		buy.disabled = CreditsService.credits < price
		buy.pressed.connect(_ask_purchase.bind(str(product.get("sku", "")), str(product.get("name", "item")), price))
		row.add_child(buy)
		products_box.add_child(card)
	if CreditsService.qbank_reset_tokens > 0:
		var reset := Button.new()
		reset.text = "Use QBank Reset Token"
		reset.tooltip_text = "Question eligibility resets; ELO, history, bookmarks, notes, reviews, and earning limits are preserved."
		reset.pressed.connect(_ask_reset)
		products_box.add_child(reset)


func _ask_purchase(sku: String, product_name: String, price: int) -> void:
	pending_sku = sku
	confirm_dialog.title = "Confirm purchase"
	confirm_dialog.dialog_text = "Buy %s for %d Rz Coins?" % [product_name, price]
	confirm_dialog.popup_centered()


func _confirm_purchase() -> void:
	if pending_sku == "__reset__":
		CreditsService.reset_qbank()
	elif not pending_sku.is_empty():
		CreditsService.purchase(pending_sku)
	pending_sku = ""


func _ask_reset() -> void:
	pending_sku = "__reset__"
	confirm_dialog.title = "Reset QBank eligibility"
	confirm_dialog.dialog_text = "Make all QBank questions eligible again? ELO, answer history, bookmarks, notes, reviews, and the rolling coin cap will be preserved."
	confirm_dialog.popup_centered()


func _show_error(message: String) -> void:
	status_label.text = message


func _show_message(message: String) -> void:
	status_label.text = message
	_refresh()