extends Control

# Forgejo #140: "quests overlap the new wave button. create a quest button
# next to the map one."
#
# The standing tracker #132 put on the HUD sat in the right-hand column, on
# top of the wave button - and there is no free strip of that screen to move
# it to, because everything down that edge is already something. So the
# objective stops living on the HUD and lives behind a button, like the map:
# a mark next to the map's own, and a panel when you press it.
#
# Owned the way WorldMap owns its open button rather than wired through
# BuildController: the button does one thing and it is this panel's.
#
# What it shows is the objective and the road behind it - what is done, and
# what is being asked for now. NOT what comes next: the chain is meant to
# open the game up a step at a time (#133), and a list of everything still
# to come is that discovery given away on the first press.

const GLOW: Color = Color(0.42, 0.86, 0.95)
const TEXT: Color = Color(0.82, 0.94, 1.0)
const DONE: Color = Color(0.55, 1.0, 0.68)
const MUTED: Color = Color(0.52, 0.66, 0.76)
const PAD: float = 34.0
# #160: the rule under the title used to sit at the title's own baseline,
# which is exactly where the window's close button is - the line ran straight
# through it. The header band is now as tall as the close button, so the rule
# clears it and the content starts below both.
const HEADER_HEIGHT: float = 150.0
const TITLE_SIZE: int = 40
const HEADING_SIZE: int = 22
const QUEST_SIZE: int = 34
const OBJECTIVE_SIZE: int = 26
const DONE_SIZE: int = 22
const BAR_HEIGHT: float = 14.0
const ROW_HEIGHT: float = 34.0

@onready var open_button: IconButton = get_node("../QuestButton")
@onready var close_button: IconButton = get_node("CloseButton")

var title_label: Label
var heading_label: Label
var quest_label: Label
var objective_label: Label
var count_label: Label
var done_heading: Label
var done_labels: Array[Label] = []
var progress: Vector2i = Vector2i.ZERO
var bar_rect: Rect2 = Rect2()


func _ready() -> void:
	visible = false
	# Transparent to GUI input, like every other panel here - see
	# IconButton._blocked_by_modal for why the buttons check instead.
	mouse_filter = Control.MOUSE_FILTER_IGNORE
	title_label = _make_label(TITLE_SIZE, TEXT)
	heading_label = _make_label(HEADING_SIZE, GLOW)
	quest_label = _make_label(QUEST_SIZE, GLOW)
	objective_label = _make_label(OBJECTIVE_SIZE, TEXT)
	objective_label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	count_label = _make_label(HEADING_SIZE, TEXT)
	count_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_RIGHT
	done_heading = _make_label(HEADING_SIZE, GLOW)
	if open_button != null:
		open_button.pressed.connect(open)
	if close_button != null:
		close_button.pressed.connect(close)
	resized.connect(_layout)
	if open_button != null and GameState.intro_active:
		# #128: a dialog stops the tree and the prologue opens on one, so the
		# first _process frame never comes. Applied here too.
		open_button.visible = false
	_layout()


func _make_label(font_size: int, colour: Color) -> Label:
	var label := Label.new()
	label.mouse_filter = Control.MOUSE_FILTER_IGNORE
	label.add_theme_font_size_override("font_size", font_size)
	label.add_theme_color_override("font_color", colour)
	label.add_theme_color_override("font_outline_color", Color(0.01, 0.03, 0.07, 0.95))
	label.add_theme_constant_override("outline_size", 3)
	label.vertical_alignment = VERTICAL_ALIGNMENT_CENTER
	add_child(label)
	return label


func open() -> void:
	_refresh()
	visible = true


func close() -> void:
	visible = false


func _layout() -> void:
	if title_label == null:
		return
	var inner: float = maxf(size.x - PAD * 2.0, 0.0)
	var y: float = PAD
	title_label.position = Vector2(PAD, y)
	# Short of the close button, so a long title wraps rather than running
	# underneath it.
	title_label.size = Vector2(maxf(inner - 140.0, 0.0), float(TITLE_SIZE) * 1.4)
	y = HEADER_HEIGHT + PAD * 0.6
	heading_label.position = Vector2(PAD, y)
	heading_label.size = Vector2(inner, float(HEADING_SIZE) * 1.4)
	y += float(HEADING_SIZE) * 1.8
	quest_label.position = Vector2(PAD, y)
	quest_label.size = Vector2(inner, float(QUEST_SIZE) * 1.3)
	count_label.position = quest_label.position
	count_label.size = quest_label.size
	y += float(QUEST_SIZE) * 1.5
	objective_label.position = Vector2(PAD, y)
	objective_label.size = Vector2(inner, float(OBJECTIVE_SIZE) * 2.6)
	y += float(OBJECTIVE_SIZE) * 2.9
	bar_rect = Rect2(Vector2(PAD, y), Vector2(inner, BAR_HEIGHT))
	y += BAR_HEIGHT * 3.5
	done_heading.position = Vector2(PAD, y)
	done_heading.size = Vector2(inner, float(HEADING_SIZE) * 1.4)
	y += float(HEADING_SIZE) * 1.9
	for label in done_labels:
		label.position = Vector2(PAD + 12.0, y)
		label.size = Vector2(inner - 12.0, ROW_HEIGHT)
		y += ROW_HEIGHT
	queue_redraw()


func _refresh() -> void:
	var quest: Dictionary = GameState.active_quest()
	title_label.text = "Objectives"
	if quest.is_empty():
		heading_label.text = "NOTHING OUTSTANDING"
		quest_label.text = "The list has run out."
		objective_label.text = "The search goes on, even with nothing left to tick off."
		count_label.text = ""
		progress = Vector2i(1, 1)
	else:
		heading_label.text = "CURRENT OBJECTIVE  %d OF %d" \
			% [GameState.quest_index + 1, GameState.quest_count()]
		quest_label.text = String(quest.title)
		objective_label.text = String(quest.objective)
		progress = GameState.quest_progress(quest)
		# A one-of-one goal is a yes/no, and "0 / 1" reads as a broken
		# counter rather than as a task not started.
		count_label.text = "%d / %d" % [progress.x, progress.y] if progress.y > 1 else ""

	# The road behind. Deliberately no list of what is still to come.
	var completed: int = GameState.quest_index
	done_heading.text = "DONE  (%d)" % completed
	while done_labels.size() < completed:
		var label: Label = _make_label(DONE_SIZE, DONE)
		done_labels.append(label)
	for i in range(done_labels.size()):
		var shown: bool = i < completed
		done_labels[i].visible = shown
		if shown:
			done_labels[i].text = "  ✓  %s" % String(GameState.quest_at(i).title)
	_layout()


func _process(_delta: float) -> void:
	# #122: the prologue leaves the player movement and nothing else, and
	# this is a button like any other. Owned here rather than by
	# BuildController, the same way the map owns its own.
	if open_button != null:
		var offered: bool = not GameState.intro_active
		if open_button.visible != offered:
			open_button.visible = offered
		if not offered and visible:
			close()
	if visible:
		# Live, so ore arriving while the panel is open works the bar up
		# instead of looking stuck.
		_refresh()


func _draw() -> void:
	if not visible:
		return
	draw_rect(Rect2(Vector2.ZERO, size), Color(0.01, 0.04, 0.08, 0.93))
	NeonDraw.draw_glowing_path(self, PackedVector2Array([
		Vector2(0.0, 0.0), Vector2(size.x, 0.0), Vector2(size.x, size.y),
		Vector2(0.0, size.y), Vector2(0.0, 0.0),
	]), Color(GLOW, 0.8), 0.8, 0.8)
	# A rule under the title, so the header reads as a header.
	var rule_y: float = HEADER_HEIGHT
	NeonDraw.draw_glowing_line(self, Vector2(PAD, rule_y), Vector2(size.x - PAD, rule_y),
		Color(GLOW, 0.5), 0.6, 0.4)

	if bar_rect.size.x <= 0.0:
		return
	draw_rect(bar_rect, Color(GLOW, 0.16))
	var filled: float = 0.0 if progress.y <= 0 \
		else clampf(float(progress.x) / float(progress.y), 0.0, 1.0)
	if filled <= 0.0:
		return
	draw_rect(Rect2(bar_rect.position, Vector2(bar_rect.size.x * filled, bar_rect.size.y)),
		Color(DONE if filled >= 1.0 else GLOW, 0.85))