extends VBoxContainer

const Style := preload("res://scripts/ui/ui_style.gd")

var main: Control
var status_label: Label
var daily_label: Label
var elo_label: Label
var streak_label: Label
var bank_label: Label
var error_label: Label
var begin_button: Button
var retry_button: Button

func _ready() -> void:
	set_anchors_preset(Control.PRESET_FULL_RECT)
	add_theme_constant_override("separation", 18)
	if not QuestionBankService.questions_changed.is_connected(_refresh):
		QuestionBankService.questions_changed.connect(_refresh)
	if not QuestionBankService.ratings_changed.is_connected(_refresh):
		QuestionBankService.ratings_changed.connect(_refresh)
	if not ProfileService.profile_changed.is_connected(_refresh):
		ProfileService.profile_changed.connect(_refresh)

	var title := Label.new()
	title.text = "Core Mode"
	Style.set_label(title, 36, Style.TEXT)
	add_child(title)

	var subtitle := Label.new()
	subtitle.text = "Begin a continuous STEP 3 question run. Keep your energy up, build score, and stay on pace."
	subtitle.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	Style.set_label(subtitle, 17, Style.MUTED)
	add_child(subtitle)

	var summary := HBoxContainer.new()
	summary.add_theme_constant_override("separation", 14)
	add_child(summary)

	daily_label = _add_metric(summary, "Today")
	elo_label = _add_metric(summary, "ELO")
	streak_label = _add_metric(summary, "Streak")
	bank_label = _add_metric(summary, "Question Bank")

	var action_panel := PanelContainer.new()
	action_panel.add_theme_stylebox_override("panel", Style.panel_box(Color("172337"), Color("405475")))
	action_panel.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	add_child(action_panel)

	var actions := VBoxContainer.new()
	actions.add_theme_constant_override("separation", 12)
	action_panel.add_child(actions)

	status_label = Label.new()
	status_label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	Style.set_label(status_label, 22, Style.CYAN)
	actions.add_child(status_label)

	error_label = Label.new()
	error_label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	Style.set_label(error_label, 15, Style.RED)
	actions.add_child(error_label)

	var button_row := HBoxContainer.new()
	button_row.add_theme_constant_override("separation", 12)
	actions.add_child(button_row)

	begin_button = Button.new()
	begin_button.text = "Begin"
	begin_button.custom_minimum_size = Vector2(260, 60)
	Style.style_primary_button(begin_button)
	begin_button.pressed.connect(_begin_core_mode)
	button_row.add_child(begin_button)

	retry_button = Button.new()
	retry_button.text = "Retry Questions"
	retry_button.custom_minimum_size = Vector2(170, 54)
	Style.style_chip(retry_button, Style.AMBER)
	retry_button.pressed.connect(QuestionBankService.retry_now)
	button_row.add_child(retry_button)

	var spacer := Control.new()
	spacer.size_flags_vertical = Control.SIZE_EXPAND_FILL
	add_child(spacer)


func on_show(_payload: Variant = null) -> void:
	if QuestionBankService.load_state == "idle" and AuthState.is_logged_in:
		QuestionBankService.load_questions_from_api()
	_refresh()


func _add_metric(parent: HBoxContainer, metric_name: String) -> Label:
	var panel := PanelContainer.new()
	panel.add_theme_stylebox_override("panel", Style.panel_box(Style.SURFACE, Color("33415c")))
	panel.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	parent.add_child(panel)

	var label := Label.new()
	label.text = metric_name
	label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	Style.set_label(label, 18, Style.TEXT)
	panel.add_child(label)
	return label


func _refresh() -> void:
	if daily_label == null:
		return

	var profile := ProfileService.get_profile()
	var answered := int(profile.get("daily_questions_answered", 0))
	var goal := int(profile.get("daily_goal_questions", 10))
	if goal < 1:
		goal = 1
	var progress := int(round(float(answered) / float(goal) * 100.0))
	if progress > 100:
		progress = 100
	daily_label.text = "Today\n%d/%d questions\n%d%% complete" % [answered, goal, progress]
	elo_label.text = "ELO\n%d overall\n%d rated" % [
		QuestionBankService.overall_elo,
		QuestionBankService.rated_question_count
	]
	streak_label.text = "Streak\n%d current\n%d best" % [
		int(profile.get("current_streak", 0)),
		int(profile.get("best_streak", 0))
	]
	bank_label.text = "Question Bank\n%d available\n%s" % [
		QuestionBankService.get_all_questions().size(),
		QuestionBankService.load_state.capitalize()
	]

	var state := QuestionBankService.load_state
	var has_questions := QuestionBankService.has_questions()
	begin_button.disabled = not has_questions
	retry_button.disabled = state == "loading"
	retry_button.visible = state != "ready"
	error_label.text = ""

	if state == "ready":
		status_label.text = BlockSessionService.core_status_message if BlockSessionService.core_status_message != "" else "Question bank ready. Begin core mode when you are ready."
	elif state == "loading":
		status_label.text = "Loading question bank..."
	elif state == "retrying":
		status_label.text = "Question API unavailable. Retrying in %d seconds." % QuestionBankService.next_retry_seconds
		error_label.text = QuestionBankService.last_error
	elif state == "failed":
		status_label.text = "Question bank is not available."
		error_label.text = QuestionBankService.last_error
	else:
		status_label.text = "Question bank has not loaded yet."


func _begin_core_mode() -> void:
	if not QuestionBankService.has_questions():
		return
	if BlockSessionService.start_core_run():
		main.show_screen("player")
	else:
		_refresh()