extends Object
class_name UITheme

## Shared comic/cel UI theme: Bangers display font, paper panels with thick
## ink borders and hard drop shadows, papaya accent. Built once, applied to
## the root Window so every Control in the game inherits it.

const FONT_PATH := "res://assets/ui/fonts/Bangers-Regular.ttf"

const INK := Color(0.09, 0.08, 0.12)
const PAPER := Color(0.98, 0.96, 0.9)
const PAPER_DIM := Color(0.92, 0.9, 0.84)
const PAPAYA := Color(1.0, 0.55, 0.15)
const PAPAYA_HOT := Color(1.0, 0.68, 0.25)
const TEAL := Color(0.16, 0.72, 0.68)

static var _theme: Theme = null


## Comic panel stylebox: flat fill, thick ink border, hard offset shadow.
static func box(bg: Color, border: Color = INK, radius: int = 10,
		border_w: int = 3, shadow: bool = true) -> StyleBoxFlat:
	var sb := StyleBoxFlat.new()
	sb.bg_color = bg
	sb.border_color = border
	sb.set_border_width_all(border_w)
	sb.set_corner_radius_all(radius)
	sb.content_margin_left = 16
	sb.content_margin_right = 16
	sb.content_margin_top = 8
	sb.content_margin_bottom = 8
	if shadow:
		sb.shadow_color = Color(INK.r, INK.g, INK.b, 0.55)
		sb.shadow_size = 0
		sb.shadow_offset = Vector2(4, 4)
		sb.shadow_size = 2
	return sb


static func build() -> Theme:
	if _theme:
		return _theme
	var t := Theme.new()
	var font: Font = load(FONT_PATH) if ResourceLoader.exists(FONT_PATH) else null
	if font:
		t.default_font = font
	t.default_font_size = 26

	# ── Buttons: paper card, papaya on hover, squash on press ────────────
	t.set_stylebox("normal", "Button", box(PAPER))
	t.set_stylebox("hover", "Button", box(PAPAYA_HOT))
	t.set_stylebox("pressed", "Button", box(PAPAYA, INK, 10, 3, false))
	t.set_stylebox("focus", "Button", box(PAPER, TEAL))
	t.set_stylebox("disabled", "Button", box(PAPER_DIM, Color(0.4, 0.4, 0.45)))
	t.set_color("font_color", "Button", INK)
	t.set_color("font_hover_color", "Button", INK)
	t.set_color("font_pressed_color", "Button", PAPER)
	t.set_color("font_focus_color", "Button", INK)
	t.set_color("font_disabled_color", "Button", Color(0.45, 0.45, 0.5))

	# OptionButton / CheckBox get the same treatment explicitly (Godot theme
	# types don't inherit styling from Button)
	for cls in ["OptionButton", "MenuButton", "CheckBox", "CheckButton"]:
		t.set_stylebox("normal", cls, box(PAPER))
		t.set_stylebox("hover", cls, box(PAPAYA_HOT))
		t.set_stylebox("pressed", cls, box(PAPAYA, INK, 10, 3, false))
		t.set_stylebox("focus", cls, box(PAPER, TEAL))
		t.set_stylebox("disabled", cls, box(PAPER_DIM, Color(0.4, 0.4, 0.45)))
		t.set_color("font_color", cls, INK)
		t.set_color("font_hover_color", cls, INK)
		t.set_color("font_pressed_color", cls, PAPER)
		t.set_color("font_focus_color", cls, INK)
		t.set_color("font_disabled_color", cls, Color(0.45, 0.45, 0.5))

	# ── Labels: ink outline everywhere for that inked-cel readability ────
	t.set_color("font_outline_color", "Label", INK)
	t.set_constant("outline_size", "Label", 8)
	t.set_color("font_color", "Label", PAPER)

	# RichTextLabel (killfeed)
	t.set_color("default_color", "RichTextLabel", PAPER)
	t.set_color("font_outline_color", "RichTextLabel", INK)
	t.set_constant("outline_size", "RichTextLabel", 6)

	# ── Inputs ───────────────────────────────────────────────────────────
	t.set_stylebox("normal", "LineEdit", box(PAPER, INK, 8, 3, false))
	t.set_stylebox("focus", "LineEdit", box(PAPER, TEAL, 8, 3, false))
	t.set_color("font_color", "LineEdit", INK)
	t.set_color("caret_color", "LineEdit", INK)

	# ── Panels / lists ───────────────────────────────────────────────────
	t.set_stylebox("panel", "PanelContainer", box(Color(0.13, 0.12, 0.18, 0.92), INK, 14, 4))
	t.set_stylebox("panel", "ItemList", box(Color(0.13, 0.12, 0.18, 0.92), INK, 10, 3, false))
	t.set_color("font_color", "ItemList", PAPER)

	# ── Popup menus (OptionButton dropdowns) ─────────────────────────────
	t.set_stylebox("panel", "PopupMenu", box(PAPER, INK, 8, 3, false))
	t.set_color("font_color", "PopupMenu", INK)
	t.set_color("font_hover_color", "PopupMenu", PAPAYA)

	_theme = t
	return t


## Apply the theme to the whole root window (inherited by every Control in
## every scene from then on). Idempotent.
static func apply_global(tree: SceneTree) -> void:
	if tree and tree.root and tree.root.theme != build():
		tree.root.theme = build()


## Attach hover/click UI sounds to every BaseButton under `root` (recursive).
static func wire_sounds(root: Node) -> void:
	var am = root.get_tree().root.get_node_or_null("AudioManager")
	if am == null:
		return
	for btn in root.find_children("*", "BaseButton", true, false):
		if btn.has_meta("ui_sfx_wired"):
			continue
		btn.set_meta("ui_sfx_wired", true)
		btn.mouse_entered.connect(func(): am.play_ui("ui_hover"))
		btn.pressed.connect(func(): am.play_ui("ui_click"))