extends MarginContainer

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

var main: Control
var summary: Label
var quota: Label
var status_label: Label
var token_labels: Dictionary = {}
var action_buttons: Array[Button] = []
var reset_dialog: ConfirmationDialog


func _ready() -> void:
	set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	_build_ui()
	AccessService.status_changed.connect(_render)
	AccessService.operation_succeeded.connect(_on_success)
	AccessService.operation_failed.connect(_on_failure)
	AccessService.checkout_started.connect(_on_checkout_started)
	UIThemeService.theme_changed.connect(refresh_theme_controls)
	AccessService.refresh()


func on_show(_payload: Variant = null) -> void:
	AccessService.refresh()
	_render(AccessService.status)


func _build_ui() -> void:
	var scroll := ScrollContainer.new()
	scroll.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	scroll.size_flags_vertical = Control.SIZE_EXPAND_FILL
	scroll.horizontal_scroll_mode = ScrollContainer.SCROLL_MODE_DISABLED
	add_child(scroll)
	var page := VBoxContainer.new()
	page.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	page.add_theme_constant_override("separation", 20)
	scroll.add_child(page)

	var title := Label.new()
	title.text = "Credits & Access"
	title.add_theme_font_override("font", Brand.font)
	title.add_theme_font_size_override("font_size", 36)
	page.add_child(title)
	var intro := Label.new()
	intro.text = "Study 20 QBank questions in a rolling 24-hour window. Eligible first attempts earn credits; 100 credits unlocks unlimited QBank access for 24 hours."
	intro.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	intro.add_theme_font_override("font", Brand.font)
	intro.add_theme_font_size_override("font_size", 17)
	page.add_child(intro)

	var overview := _panel()
	page.add_child(overview)
	var overview_content := VBoxContainer.new()
	overview_content.add_theme_constant_override("separation", 10)
	overview.add_child(overview_content)
	summary = _label("", 24)
	quota = _label("", 17)
	overview_content.add_child(summary)
	overview_content.add_child(quota)
	var redeem := _button("Redeem 100 credits for 24 hours", AccessService.redeem_credits)
	overview_content.add_child(redeem)

	var token_grid := GridContainer.new()
	token_grid.columns = 3
	token_grid.add_theme_constant_override("h_separation", 16)
	token_grid.add_theme_constant_override("v_separation", 16)
	page.add_child(token_grid)
	_add_access_card(token_grid, "day", "1 day", "$1.00", "24 hours")
	_add_access_card(token_grid, "week", "1 week", "$5.00", "168 hours")
	_add_access_card(token_grid, "month", "1 month", "$20.00", "30 days")

	var extras := _panel()
	page.add_child(extras)
	var extras_content := VBoxContainer.new()
	extras_content.add_theme_constant_override("separation", 12)
	extras.add_child(extras_content)
	extras_content.add_child(_label("Study tools", 24))
	token_labels["exam"] = _label("", 16)
	extras_content.add_child(token_labels["exam"])
	extras_content.add_child(_button("Buy exam simulation token — $1.99",
		func(): AccessService.begin_checkout("exam_token_1")))
	token_labels["reset"] = _label("", 16)
	extras_content.add_child(token_labels["reset"])
	extras_content.add_child(_button("Buy QBank reset token — $4.99",
		func(): AccessService.begin_checkout("qbank_reset_1")))
	extras_content.add_child(_button("Use QBank reset token", _confirm_reset))

	status_label = _label("", 15)
	status_label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	page.add_child(status_label)

	reset_dialog = ConfirmationDialog.new()
	reset_dialog.title = "Reset QBank progress?"
	reset_dialog.dialog_text = "This starts a new QBank cycle. Questions become unused and credit-eligible again. Historical aggregate samples, bookmarks, notes, and review content remain."
	reset_dialog.ok_button_text = "Reset QBank"
	reset_dialog.confirmed.connect(AccessService.reset_qbank)
	add_child(reset_dialog)
	refresh_theme_controls()


func _add_access_card(parent: GridContainer, token: String, heading: String, price: String, duration: String) -> void:
	var panel := _panel()
	panel.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	parent.add_child(panel)
	var content := VBoxContainer.new()
	content.add_theme_constant_override("separation", 10)
	panel.add_child(content)
	content.add_child(_label(heading, 24))
	content.add_child(_label("%s of unlimited QBank access" % duration, 15))
	token_labels[token] = _label("", 15)
	content.add_child(token_labels[token])
	content.add_child(_button("Buy token — %s" % price,
		func(): AccessService.begin_checkout("access_%s_1" % token)))
	content.add_child(_button("Activate token",
		func(): AccessService.activate_token(token)))


func _render(value: Dictionary) -> void:
	if summary == null:
		return
	var credits := int(value.get("credits", 0))
	var unlimited := bool(value.get("unlimited", false))
	var expiry := str(value.get("unlimitedUntilUtc", ""))
	summary.text = "%d credits  •  %s" % [
		credits,
		("Unlimited QBank active until %s" % expiry) if unlimited else "Free QBank access"
	]
	quota.text = "%d of %d free questions remaining in the rolling window" % [
		int(value.get("questionsRemaining", 20)),
		int(value.get("freeQuestionLimit", 20))
	]
	token_labels.get("day", _label()).text = "%d available" % int(value.get("dayTokens", 0))
	token_labels.get("week", _label()).text = "%d available" % int(value.get("weekTokens", 0))
	token_labels.get("month", _label()).text = "%d available" % int(value.get("monthTokens", 0))
	token_labels.get("exam", _label()).text = "Exam tokens: %d" % int(value.get("examTokens", 0))
	token_labels.get("reset", _label()).text = "QBank reset tokens: %d" % int(value.get("resetTokens", 0))


func _confirm_reset() -> void:
	reset_dialog.popup_centered(Vector2i(620, 260))


func _on_success(message: String) -> void:
	status_label.text = message
	status_label.add_theme_color_override("font_color", Brand.SUCCESS)


func _on_failure(message: String) -> void:
	status_label.text = message
	status_label.add_theme_color_override("font_color", Color("ef4444"))


func _on_checkout_started(_purchase_id: String, _url: String) -> void:
	status_label.text = "Complete checkout in the secure payment window."


func refresh_theme_controls() -> void:
	for button in action_buttons:
		var dark := UIThemeService.is_dark_mode()
		button.add_theme_font_override("font", Brand.font)
		button.add_theme_color_override("font_color", Brand.text_color(dark))
		button.add_theme_stylebox_override("normal", Brand.secondary_button_box(dark))
		button.add_theme_stylebox_override("hover", Brand.secondary_button_box(dark, true))
		button.add_theme_stylebox_override("pressed", Brand.secondary_button_box(dark, true))


func _panel() -> PanelContainer:
	var panel := PanelContainer.new()
	panel.add_theme_stylebox_override("panel", Brand.panel_box(UIThemeService.is_dark_mode()))
	return panel


func _label(text := "", size := 16) -> Label:
	var label := Label.new()
	label.text = text
	label.add_theme_font_override("font", Brand.font)
	label.add_theme_font_size_override("font_size", size)
	label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	return label


func _button(text: String, callback: Callable) -> Button:
	var button := Button.new()
	button.text = text
	button.custom_minimum_size = Vector2(0, 48)
	button.pressed.connect(callback)
	action_buttons.append(button)
	return button