extends CanvasLayer

const _GOLD  := Color(1.00, 0.78, 0.22)
const _CREAM := Color(0.93, 0.88, 0.72)
const _MUTED := Color(0.66, 0.60, 0.46)

# Per-ability trim colour, tying each tile (and its key cap) to that ability's FX.
# Order matches _ABILITY_ICONS: kick, slam, dash, roll.
const _ABILITY_ACCENT: Array[Color] = [
	Color(1.00, 0.62, 0.16),   # Kick — ember orange
	Color(0.98, 0.34, 0.20),   # Slam — crimson
	Color(0.45, 0.75, 1.00),   # Dash — sky blue
	Color(1.00, 0.82, 0.32),   # Roll — gold
]

const _ABILITY_ICONS: Array[String] = [
	"res://HUD/KICK.png",
	"res://HUD/SLAM.png",
	"res://HUD/DASH.png",
	"res://HUD/ROLL.png",
]
const _ABILITY_ACTIONS: Array[StringName] = [
	&"ability_kick", &"ability_slam", &"ability_dash", &"ability_roll",
]
# Fallback label shown in a slot whose icon file fails to load.
const _ABILITY_NAMES: Array[String] = ["Kick", "Slam", "Dash", "Roll"]

var _controls_visible: bool = false
var _controls_panel: PanelContainer
var _toggle_btn: Button
var _tab_hint: Label
var _spawner: Node
var _player: Node = null
var _died_connected: bool = false
var _cd_overlays: Array[ColorRect] = []
var _cd_labels: Array[Label] = []
var _ability_bar: HBoxContainer
var _ability_panels: Array[PanelContainer] = []

# Win/lose screen. _game_over latches so the result is shown once; _result_win
# records which way it went (read by the gameplay test).
const _WIN_VIDEO  := "res://videos/bull_win.ogv"       # the bull triumphs
const _LOSS_VIDEO := "res://videos/matador_win.ogv"    # the matador triumphs

var _game_over: bool = false
var _result_win: bool = false
var _over_root: Control
var _over_video: VideoStreamPlayer


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


# Unobtrusive early-build tag in the bottom-right corner.
func _build_version_label() -> void:
	var lbl := Label.new()
	lbl.text = GameVersion.full()
	lbl.add_theme_color_override("font_color", _MUTED)
	lbl.add_theme_font_size_override("font_size", 12)
	lbl.set_anchors_preset(Control.PRESET_BOTTOM_RIGHT)
	lbl.grow_horizontal = Control.GROW_DIRECTION_BEGIN
	lbl.grow_vertical = Control.GROW_DIRECTION_BEGIN
	lbl.offset_right = -14.0
	lbl.offset_bottom = -10.0
	lbl.mouse_filter = Control.MOUSE_FILTER_IGNORE
	add_child(lbl)


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
	if not _died_connected:
		_died_connected = true
		_player.died.connect(_on_player_died)
	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
		var remaining: float = _player.call(&"ability_cooldown_remaining", i)
		var lbl := _cd_labels[i]
		if remaining > 0.0:
			lbl.text    = "%.1fs" % remaining
			lbl.visible = true
		else:
			lbl.visible = false


func _find_spawner() -> void:
	var spawners := get_tree().get_nodes_in_group(&"matador_spawn")
	if spawners.is_empty():
		return
	_spawner = spawners[0]
	_spawner.all_defeated.connect(_on_all_defeated)


func _unhandled_input(event: InputEvent) -> void:
	if event is InputEventKey and event.pressed and not event.echo:
		if _game_over and event.physical_keycode in [KEY_ENTER, KEY_KP_ENTER]:
			_restart()
		elif event.physical_keycode == KEY_TAB and not _game_over:
			_toggle_controls()
		elif event.physical_keycode == KEY_ESCAPE:
			_return_to_menu()


func _return_to_menu() -> void:
	get_tree().paused = false
	Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
	get_tree().change_scene_to_file("res://MainMenu.tscn")


func _restart() -> void:
	get_tree().paused = false
	Input.mouse_mode = Input.MOUSE_MODE_CAPTURED
	get_tree().reload_current_scene()


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


# ── Win / lose ──────────────────────────────────────────────────────────────
# The bull takes one clean blade and it's over; clear the last matador and it's a
# victory. Both routes end here — the arena freezes and the result is proclaimed.

func _on_player_died(cause: String = "") -> void:
	_show_game_over(false, cause)


func _on_all_defeated() -> void:
	_show_game_over(true)


func _show_game_over(win: bool, _cause: String = "") -> void:
	if _game_over:
		return
	_game_over = true
	_result_win = win

	if _controls_panel:
		_controls_panel.visible = false
	if _tab_hint:
		_tab_hint.visible = false

	# Swap in the matching outcome clip and loop it behind the buttons.
	var path := _WIN_VIDEO if win else _LOSS_VIDEO
	if ResourceLoader.exists(path):
		_over_video.stream = load(path)
		_over_video.play()

	_over_root.visible = true
	_over_root.modulate.a = 0.0
	Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
	get_tree().paused = true

	create_tween().tween_property(_over_root, "modulate:a", 1.0, 0.5)


func _build_game_over() -> void:
	_over_root = Control.new()
	_over_root.set_anchors_preset(Control.PRESET_FULL_RECT)
	_over_root.process_mode = Node.PROCESS_MODE_ALWAYS
	_over_root.visible = false
	add_child(_over_root)

	# Full-screen outcome clip (bull win / matador win), looping.
	_over_video = VideoStreamPlayer.new()
	_over_video.set_anchors_preset(Control.PRESET_FULL_RECT)
	_over_video.expand = true
	_over_video.process_mode = Node.PROCESS_MODE_ALWAYS
	_over_video.mouse_filter = Control.MOUSE_FILTER_IGNORE
	_over_video.finished.connect(_over_video.play)  # loop the outcome clip
	_over_root.add_child(_over_video)

	# Buttons overlaid at the bottom of the clip.
	var row := HBoxContainer.new()
	row.alignment = BoxContainer.ALIGNMENT_CENTER
	row.add_theme_constant_override("separation", 16)
	row.anchor_left   = 0.5
	row.anchor_right  = 0.5
	row.anchor_top    = 1.0
	row.anchor_bottom = 1.0
	row.grow_horizontal = Control.GROW_DIRECTION_BOTH
	row.grow_vertical   = Control.GROW_DIRECTION_BEGIN
	row.offset_bottom   = -48.0
	_over_root.add_child(row)

	var again := _make_button("Go Again  (Enter)")
	again.pressed.connect(_restart)
	row.add_child(again)

	var menu := _make_button("Main Menu")
	menu.pressed.connect(_return_to_menu)
	row.add_child(menu)


const _SLOT_SEPARATION: int = 10


func _build_ability_bar() -> void:
	_ability_bar = HBoxContainer.new()
	_ability_bar.add_theme_constant_override("separation", _SLOT_SEPARATION)
	_ability_bar.anchor_left    = 0.5
	_ability_bar.anchor_right   = 0.5
	_ability_bar.anchor_top     = 1.0
	_ability_bar.anchor_bottom  = 1.0
	_ability_bar.grow_horizontal = Control.GROW_DIRECTION_BOTH
	_ability_bar.grow_vertical   = Control.GROW_DIRECTION_BEGIN
	_ability_bar.offset_bottom  = -20.0
	add_child(_ability_bar)
	for i: int in 4:
		_ability_bar.add_child(_build_ability_slot(i))
	_layout_ability_bar()
	get_viewport().size_changed.connect(_layout_ability_bar)


# Size the ability slots as a fraction of the viewport (clamped) so the bar scales
# with the window, and keep it horizontally centred by matching the HBox offsets.
func _layout_ability_bar() -> void:
	var vp := get_viewport().get_visible_rect().size
	var slot := clampf(minf(vp.x * 0.055, vp.y * 0.11), 56.0, 104.0)
	for panel: PanelContainer in _ability_panels:
		panel.custom_minimum_size = Vector2(slot, slot)
	var total := slot * 4.0 + float(_SLOT_SEPARATION) * 3.0
	_ability_bar.offset_left  = -total * 0.5
	_ability_bar.offset_right =  total * 0.5


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

	var panel := PanelContainer.new()
	panel.custom_minimum_size = Vector2(72.0, 72.0)
	panel.add_theme_stylebox_override(
		"panel", UiTheme.plaque(UiTheme.LEATHER, _ABILITY_ACCENT[idx], 4, 5.0, 5.0))
	vbox.add_child(panel)
	_ability_panels.append(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])
		# Ignore the texture's native size so a large source PNG doesn't blow the
		# slot's minimum size out; scale-to-fit the box while keeping aspect.
		icon.expand_mode  = TextureRect.EXPAND_IGNORE_SIZE
		icon.stretch_mode = TextureRect.STRETCH_KEEP_ASPECT_CENTERED
		icon.set_anchors_preset(Control.PRESET_FULL_RECT)
		icon.mouse_filter = Control.MOUSE_FILTER_IGNORE
		stack.add_child(icon)
	else:
		var name_lbl := Label.new()
		name_lbl.text = _ABILITY_NAMES[idx]
		name_lbl.set_anchors_preset(Control.PRESET_FULL_RECT)
		name_lbl.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
		name_lbl.vertical_alignment   = VERTICAL_ALIGNMENT_CENTER
		name_lbl.mouse_filter         = Control.MOUSE_FILTER_IGNORE
		name_lbl.add_theme_color_override("font_color", _GOLD)
		name_lbl.add_theme_font_size_override("font_size", 16)
		stack.add_child(name_lbl)

	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 cd_lbl := Label.new()
	cd_lbl.set_anchors_preset(Control.PRESET_FULL_RECT)
	cd_lbl.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	cd_lbl.vertical_alignment   = VERTICAL_ALIGNMENT_CENTER
	cd_lbl.mouse_filter         = Control.MOUSE_FILTER_IGNORE
	cd_lbl.visible              = false
	cd_lbl.add_theme_color_override("font_color", Color.WHITE)
	cd_lbl.add_theme_font_size_override("font_size", 18)
	stack.add_child(cd_lbl)
	_cd_labels.append(cd_lbl)

	var key_lbl := Label.new()
	key_lbl.text                       = Controls.get_key_label(_ABILITY_ACTIONS[idx])
	key_lbl.horizontal_alignment       = HORIZONTAL_ALIGNMENT_CENTER
	key_lbl.add_theme_font_override("font", UiFonts.body())
	key_lbl.add_theme_color_override("font_color",         _ABILITY_ACCENT[idx].lerp(_CREAM, 0.35))
	key_lbl.add_theme_color_override("font_outline_color", Color(0, 0, 0, 0.85))
	key_lbl.add_theme_constant_override("outline_size",    3)
	key_lbl.add_theme_font_size_override("font_size",  13)
	vbox.add_child(key_lbl)

	return vbox


func _build_tab_hint() -> void:
	_tab_hint = Label.new()
	_tab_hint.text = "Press 'Tab' to see controls"
	_tab_hint.anchor_left   = 0.0
	_tab_hint.anchor_top    = 1.0
	_tab_hint.anchor_right  = 0.0
	_tab_hint.anchor_bottom = 1.0
	_tab_hint.grow_vertical = Control.GROW_DIRECTION_BEGIN
	_tab_hint.offset_left   = 20.0
	_tab_hint.offset_bottom = -20.0
	_tab_hint.add_theme_color_override("font_color", _MUTED)
	_tab_hint.add_theme_font_size_override("font_size", 12)
	add_child(_tab_hint)


func _build_controls_panel() -> void:
	_controls_panel = PanelContainer.new()
	_controls_panel.add_theme_stylebox_override(
		"panel", UiTheme.plaque(UiTheme.LEATHER, UiTheme.BORDER, 4, 16.0, 12.0))

	_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
	_controls_panel.visible = false
	add_child(_controls_panel)

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

	var move_keys := "%s %s %s %s" % [
		Controls.get_key_label(&"move_forward"),
		Controls.get_key_label(&"move_left"),
		Controls.get_key_label(&"move_back"),
		Controls.get_key_label(&"move_right"),
	]
	_row(vbox, move_keys,       "Move",                 _CREAM)
	_row(vbox, Controls.get_key_label(&"ability_kick"), "Kick",   _CREAM)
	_row(vbox, Controls.get_key_label(&"ability_slam"), "Slam",   _CREAM)
	_row(vbox, Controls.get_key_label(&"ability_dash"), "Dash",   _CREAM)
	_row(vbox, Controls.get_key_label(&"ability_roll"), "Roll (Powerball: ram the matador!)", _CREAM)
	_row(vbox, "Scroll",        "Zoom",                 _CREAM)
	_row(vbox, "Tab",           "Toggle controls",       _MUTED)
	_row(vbox, "Esc",           "Back to menu",          _MUTED)

	var sep := HSeparator.new()
	sep.add_theme_stylebox_override("separator", UiTheme.rule())
	vbox.add_child(sep)

	_toggle_btn = _make_button("Show controls")
	_toggle_btn.pressed.connect(_toggle_controls)
	vbox.add_child(_toggle_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 := UiTheme.plaque(Color(0.10, 0.07, 0.03, 0.90), _GOLD,  3, 18.0, 9.0)
	var hover  := UiTheme.plaque(Color(0.16, 0.10, 0.04, 0.96), _CREAM, 3, 18.0, 9.0)

	btn.add_theme_stylebox_override("normal", normal)
	btn.add_theme_stylebox_override("hover", hover)
	btn.add_theme_stylebox_override("pressed", hover)
	btn.add_theme_stylebox_override("focus", hover)
	btn.add_theme_font_override("font", UiFonts.body())
	btn.add_theme_color_override("font_color", _GOLD)
	btn.add_theme_color_override("font_hover_color", _CREAM)
	btn.add_theme_font_size_override("font_size", 18)

	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()
	badge.add_theme_stylebox_override("panel", UiTheme.badge())
	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)