extends CanvasLayer

const _GOLD   := Color(1.00, 0.78, 0.22)
const _CREAM  := Color(0.88, 0.83, 0.72)
const _MUTED  := Color(0.65, 0.60, 0.48)
const _BG     := Color(0.06, 0.04, 0.02, 0.78)
const _BADGE  := Color(0.16, 0.10, 0.03, 0.90)
const _BORDER := Color(0.65, 0.48, 0.15, 0.55)

const _ABILITY_ICONS: Array[String] = [
	"res://HUD/HUD_0000_ability_JALG.png",
	"res://HUD/HUD_0001_ability_SLAM.png",
	"res://HUD/HUD_0002_ability_DASH.png",
]
const _ABILITY_KEYS:  Array[String] = ["F", "G", "H"]

var _controls_visible: bool = true
var _controls_panel: PanelContainer
var _toggle_btn: Button
var _spawner: Node
var _player: Node = null
var _cd_overlays: Array[ColorRect] = []


func _ready() -> void:
	layer = 11
	process_mode = Node.PROCESS_MODE_ALWAYS
	_build_controls_panel()
	_build_ability_bar()
	_find_spawner.call_deferred()


func _process(_delta: float) -> void:
	if _player == null:
		var players := get_tree().get_nodes_in_group(&"player")
		if not players.is_empty():
			_player = players[0]
		return
	for i: int in _cd_overlays.size():
		var fraction: float = _player.call(&"ability_cooldown_fraction", i)
		var ov := _cd_overlays[i]
		ov.anchor_top    = 1.0 - fraction
		ov.anchor_bottom = 1.0


func _find_spawner() -> void:
	var spawners := get_tree().get_nodes_in_group(&"matador_spawn")
	if not spawners.is_empty():
		_spawner = spawners[0]


func _unhandled_input(event: InputEvent) -> void:
	if event is InputEventKey and event.pressed and not event.echo:
		if event.physical_keycode == KEY_TAB:
			_toggle_controls()


func _toggle_controls() -> void:
	_controls_visible = not _controls_visible
	_controls_panel.visible = _controls_visible
	_toggle_btn.text = "Hide controls" if _controls_visible else "Show controls"


func _on_reset_pressed() -> void:
	if get_tree().paused:
		get_tree().paused = false
	if _spawner:
		_spawner.reset_spawn()


func _build_ability_bar() -> void:
	var bar := HBoxContainer.new()
	bar.add_theme_constant_override("separation", 10)
	bar.anchor_left    = 0.5
	bar.anchor_right   = 0.5
	bar.anchor_top     = 1.0
	bar.anchor_bottom  = 1.0
	bar.grow_horizontal = Control.GROW_DIRECTION_BOTH
	bar.grow_vertical   = Control.GROW_DIRECTION_BEGIN
	bar.offset_left    = -120.0
	bar.offset_bottom  = -20.0
	add_child(bar)
	for i: int in 3:
		bar.add_child(_build_ability_slot(i))


func _build_ability_slot(idx: int) -> Control:
	var vbox := VBoxContainer.new()
	vbox.add_theme_constant_override("separation", 4)

	var bg_style := StyleBoxFlat.new()
	bg_style.bg_color                    = _BG
	bg_style.corner_radius_top_left      = 6
	bg_style.corner_radius_top_right     = 6
	bg_style.corner_radius_bottom_left   = 6
	bg_style.corner_radius_bottom_right  = 6
	bg_style.border_width_left           = 1
	bg_style.border_width_right          = 1
	bg_style.border_width_top            = 1
	bg_style.border_width_bottom         = 1
	bg_style.border_color                = _BORDER
	bg_style.content_margin_left         = 4.0
	bg_style.content_margin_right        = 4.0
	bg_style.content_margin_top          = 4.0
	bg_style.content_margin_bottom       = 4.0

	var panel := PanelContainer.new()
	panel.custom_minimum_size = Vector2(72.0, 72.0)
	panel.add_theme_stylebox_override("panel", bg_style)
	vbox.add_child(panel)

	var stack := Control.new()
	stack.set_anchors_preset(Control.PRESET_FULL_RECT)
	panel.add_child(stack)

	if ResourceLoader.exists(_ABILITY_ICONS[idx]):
		var icon := TextureRect.new()
		icon.texture      = load(_ABILITY_ICONS[idx])
		icon.stretch_mode = TextureRect.STRETCH_KEEP_ASPECT_CENTERED
		icon.set_anchors_preset(Control.PRESET_FULL_RECT)
		stack.add_child(icon)

	var cd_overlay := ColorRect.new()
	cd_overlay.color         = Color(0.0, 0.0, 0.0, 0.70)
	cd_overlay.anchor_left   = 0.0
	cd_overlay.anchor_right  = 1.0
	cd_overlay.anchor_top    = 1.0
	cd_overlay.anchor_bottom = 1.0
	cd_overlay.mouse_filter  = Control.MOUSE_FILTER_IGNORE
	stack.add_child(cd_overlay)
	_cd_overlays.append(cd_overlay)

	var key_lbl := Label.new()
	key_lbl.text                       = _ABILITY_KEYS[idx]
	key_lbl.horizontal_alignment       = HORIZONTAL_ALIGNMENT_CENTER
	key_lbl.add_theme_color_override("font_color",     _GOLD)
	key_lbl.add_theme_font_size_override("font_size",  12)
	vbox.add_child(key_lbl)

	return vbox


func _build_controls_panel() -> void:
	_controls_panel = PanelContainer.new()

	var bg := StyleBoxFlat.new()
	bg.bg_color = _BG
	bg.corner_radius_top_left     = 7
	bg.corner_radius_top_right    = 7
	bg.corner_radius_bottom_left  = 7
	bg.corner_radius_bottom_right = 7
	bg.border_width_left   = 1
	bg.border_width_right  = 1
	bg.border_width_top    = 1
	bg.border_width_bottom = 1
	bg.border_color = _BORDER
	bg.content_margin_left   = 14.0
	bg.content_margin_right  = 14.0
	bg.content_margin_top    = 10.0
	bg.content_margin_bottom = 10.0
	_controls_panel.add_theme_stylebox_override("panel", bg)

	_controls_panel.anchor_left   = 0.0
	_controls_panel.anchor_top    = 1.0
	_controls_panel.anchor_right  = 0.0
	_controls_panel.anchor_bottom = 1.0
	_controls_panel.grow_vertical = Control.GROW_DIRECTION_BEGIN
	_controls_panel.offset_left   = 20.0
	_controls_panel.offset_bottom = -20.0
	add_child(_controls_panel)

	var vbox := VBoxContainer.new()
	vbox.add_theme_constant_override("separation", 5)
	_controls_panel.add_child(vbox)

	_row(vbox, "WASD / Arrows", "Move  (not intended)", _MUTED)
	_row(vbox, "LMB (hold)",    "Right horn",           _CREAM)
	_row(vbox, "RMB (hold)",    "Left horn",            _CREAM)
	_row(vbox, "F",             "Kick",                 _CREAM)
	_row(vbox, "G",             "Slam",                 _CREAM)
	_row(vbox, "H",             "Dash",                 _CREAM)
	_row(vbox, "Scroll",        "Zoom",                 _CREAM)
	_row(vbox, "R",             "Respawn matadors (cooldown)", _MUTED)
	_row(vbox, "Tab",           "Toggle controls",       _MUTED)

	var sep := HSeparator.new()
	var sep_style := StyleBoxFlat.new()
	sep_style.bg_color = Color(0.65, 0.48, 0.15, 0.30)
	sep_style.content_margin_top    = 4.0
	sep_style.content_margin_bottom = 4.0
	sep.add_theme_stylebox_override("separator", sep_style)
	vbox.add_child(sep)

	var hbox := HBoxContainer.new()
	hbox.add_theme_constant_override("separation", 8)
	vbox.add_child(hbox)

	_toggle_btn = _make_button("Hide controls")
	_toggle_btn.pressed.connect(_toggle_controls)
	hbox.add_child(_toggle_btn)

	var reset_btn := _make_button("Reset")
	reset_btn.pressed.connect(_on_reset_pressed)
	hbox.add_child(reset_btn)


func _make_button(label_text: String) -> Button:
	var btn := Button.new()
	btn.text = label_text
	btn.process_mode = Node.PROCESS_MODE_ALWAYS

	var normal := StyleBoxFlat.new()
	normal.bg_color = Color(0.18, 0.12, 0.04, 0.90)
	normal.corner_radius_top_left     = 5
	normal.corner_radius_top_right    = 5
	normal.corner_radius_bottom_left  = 5
	normal.corner_radius_bottom_right = 5
	normal.border_width_left   = 1
	normal.border_width_right  = 1
	normal.border_width_top    = 1
	normal.border_width_bottom = 1
	normal.border_color = _BORDER
	normal.content_margin_left   = 12.0
	normal.content_margin_right  = 12.0
	normal.content_margin_top    = 6.0
	normal.content_margin_bottom = 6.0

	var hover := StyleBoxFlat.new()
	hover.bg_color = Color(0.30, 0.20, 0.06, 0.95)
	hover.corner_radius_top_left     = 5
	hover.corner_radius_top_right    = 5
	hover.corner_radius_bottom_left  = 5
	hover.corner_radius_bottom_right = 5
	hover.border_width_left   = 1
	hover.border_width_right  = 1
	hover.border_width_top    = 1
	hover.border_width_bottom = 1
	hover.border_color = _GOLD
	hover.content_margin_left   = 12.0
	hover.content_margin_right  = 12.0
	hover.content_margin_top    = 6.0
	hover.content_margin_bottom = 6.0

	btn.add_theme_stylebox_override("normal", normal)
	btn.add_theme_stylebox_override("hover", hover)
	btn.add_theme_stylebox_override("pressed", hover)
	btn.add_theme_color_override("font_color", _GOLD)
	btn.add_theme_color_override("font_hover_color", _GOLD)
	btn.add_theme_font_size_override("font_size", 12)

	return btn


func _row(parent: VBoxContainer, key: String, desc: String, desc_color: Color) -> void:
	var row := HBoxContainer.new()
	row.add_theme_constant_override("separation", 10)
	parent.add_child(row)

	var badge := PanelContainer.new()
	var bs := StyleBoxFlat.new()
	bs.bg_color = _BADGE
	bs.corner_radius_top_left     = 3
	bs.corner_radius_top_right    = 3
	bs.corner_radius_bottom_left  = 3
	bs.corner_radius_bottom_right = 3
	bs.content_margin_left   = 6.0
	bs.content_margin_right  = 6.0
	bs.content_margin_top    = 2.0
	bs.content_margin_bottom = 2.0
	badge.add_theme_stylebox_override("panel", bs)
	badge.custom_minimum_size = Vector2(100.0, 0.0)
	row.add_child(badge)

	var key_lbl := Label.new()
	key_lbl.text = key
	key_lbl.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	key_lbl.vertical_alignment   = VERTICAL_ALIGNMENT_CENTER
	key_lbl.add_theme_color_override("font_color", _GOLD)
	key_lbl.add_theme_font_size_override("font_size", 12)
	badge.add_child(key_lbl)

	var desc_lbl := Label.new()
	desc_lbl.text = desc
	desc_lbl.vertical_alignment = VERTICAL_ALIGNMENT_CENTER
	desc_lbl.add_theme_color_override("font_color", desc_color)
	desc_lbl.add_theme_font_size_override("font_size", 12)
	row.add_child(desc_lbl)