extends CanvasLayer
## On-screen controls for touch devices: a floating movement joystick on the left
## and a cluster of ability buttons on the right. Instantiated by hud.gd.
##
## All interaction is driven from raw `_input()` with manual hit-testing, NOT from
## Control.gui_input. On the web/wasm build the overlay lives in a CanvasLayer nested
## under the HUD, and GUI touch routing into a nested CanvasLayer renders fine but
## silently drops input — a standard Button here never fires. `_input()` sees every
## InputEventScreenTouch regardless of nesting, mouse_filter, or emulate_mouse_from_touch,
## so the joystick and buttons work reliably across browsers. Everything is drawn in one
## Control (_surface) whose rects are the single source of truth for both drawing and
## hit-testing.
##
## The joystick feeds the same `move_*` input actions the keyboard/gamepad drive (via
## Input.action_press with an analog strength), so player.gd needs no touch awareness — it
## just reads Input.get_vector() as always. Ability buttons call the player's public
## try_activate_ability(), sharing the keyboard's cooldown gate.
##
## Shown only on touch platforms (see Controls.use_touch_ui), or when DP
## "force_touch_controls" is on so the layout can be exercised on a desktop build
## (emulate_touch_from_mouse turns a mouse click into a touch event for that).

# move_* actions, indexed by the four joystick push directions.
const _MOVE_RIGHT:   StringName = &"move_right"
const _MOVE_LEFT:    StringName = &"move_left"
const _MOVE_BACK:    StringName = &"move_back"
const _MOVE_FORWARD: StringName = &"move_forward"

# Ability slots in player.gd order: kick=0, dash=1, slam=2, roll=3.
const _ABILITY_ICONS: Array[String] = [
	"res://HUD/KICK.png",
	"res://HUD/DASH.png",
	"res://HUD/SLAM.png",
	"res://HUD/ROLL.png",
]
const _ABILITY_LETTERS: Array[String] = ["K", "D", "S", "R"]
const _ABILITY_ACCENT: Array[Color] = [
	Color(1.00, 0.62, 0.16),   # Kick — ember orange
	Color(0.45, 0.75, 1.00),   # Dash — sky blue
	Color(0.98, 0.34, 0.20),   # Slam — crimson
	Color(1.00, 0.82, 0.32),   # Roll — gold
]

# Sentinel touch indices. A real finger uses its own non-negative index; the mouse
# (desktop force-flag testing, when no real touch has been seen) uses _MOUSE.
const _MOUSE: int = -2

var _surface: Control
var _player: Node = null

# Cached textures + styleboxes so the per-frame redraw (cooldowns animate) allocates nothing.
var _ability_tex: Array[Texture2D] = []
var _ability_style: Array[StyleBoxFlat] = []
var _menu_style: StyleBoxFlat

# Layout rects in screen space — the single source of truth for drawing AND hit-testing.
var _stick_zone: Rect2 = Rect2()
var _ability_rects: Array[Rect2] = []
var _menu_rect: Rect2 = Rect2()

# Resting "drag to move" affordance drawn in the lower-left when the stick is idle, so a
# first-time player sees where to plant their thumb instead of guessing. _hint_pulse gives
# it a slow breathing alpha for discoverability.
var _stick_hint_center: Vector2 = Vector2()
var _hint_pulse: float = 0.0

# Floating-joystick state. _origin is where the thumb first touched (base centre), _knob is
# the current thumb position; both in screen coordinates.
var _stick_active: bool = false
var _origin: Vector2 = Vector2.ZERO
var _knob: Vector2 = Vector2.ZERO
var _stick_radius: float = 110.0

# Live fingers by index → screen position, plus what each finger is doing ("stick", a slot
# int, "menu", or "camera"). Ownership keeps a second finger on a button from stealing the
# stick, and keeps steering/ability fingers from being mistaken for a pinch gesture.
var _touches: Dictionary = {}
var _touch_owner: Dictionary = {}
var _saw_real_touch: bool = false

# Pinch-to-zoom: only "camera" fingers (right side, not on any button) count, so steering
# with one thumb while tapping an ability with the other never reads as a zoom.
var _pinching: bool = false
var _pinch_dist: float = 0.0

# Diagnostics surfaced by DP "touch_debug" — lets us see, on the actual device, whether
# events arrive and where, since no console is reachable there.
var _dbg_events: int = 0
var _dbg_last_pos: Vector2 = Vector2.ZERO


func _ready() -> void:
	layer = 10   # below the HUD (11) so the game-over screen always draws on top
	process_mode = Node.PROCESS_MODE_ALWAYS

	for slot: int in 4:
		var tex: Texture2D = null
		if ResourceLoader.exists(_ABILITY_ICONS[slot]):
			tex = load(_ABILITY_ICONS[slot])
		_ability_tex.append(tex)
		_ability_style.append(_button_style(_ABILITY_ACCENT[slot]))
	_menu_style = _button_style(Color(1.00, 0.78, 0.22, 0.8))

	_surface = Control.new()
	_surface.set_anchors_preset(Control.PRESET_FULL_RECT)
	_surface.mouse_filter = Control.MOUSE_FILTER_IGNORE
	_surface.visible = false
	_surface.draw.connect(_draw_surface)
	add_child(_surface)

	_relayout()
	get_viewport().size_changed.connect(_relayout)


# ── Layout ────────────────────────────────────────────────────────────────────
# Left half is the joystick zone (touch anywhere in it to plant the base under the thumb);
# the ability cluster and menu button sit in the right half so they never overlap it.

func _relayout() -> void:
	var vp := get_viewport().get_visible_rect().size
	var short := minf(vp.x, vp.y)
	_stick_radius = clampf(short * 0.16, 80.0, 150.0)
	_stick_zone = Rect2(Vector2.ZERO, Vector2(vp.x * 0.5, vp.y))

	var bs := clampf(short * 0.16, 72.0, 120.0)   # ability button edge
	var gap := bs * 0.18
	var margin := bs * 0.28
	var right := vp.x - margin
	var bottom := vp.y - margin
	var col0 := right - bs * 2.0 - gap
	var col1 := right - bs
	var row0 := bottom - bs * 2.0 - gap
	var row1 := bottom - bs
	_ability_rects = [
		Rect2(col0, row0, bs, bs),   # kick
		Rect2(col1, row0, bs, bs),   # dash
		Rect2(col0, row1, bs, bs),   # slam
		Rect2(col1, row1, bs, bs),   # roll
	]

	var ms := clampf(short * 0.09, 48.0, 72.0)
	_menu_rect = Rect2(vp.x - ms - 16.0, 16.0, ms, ms)

	_stick_hint_center = Vector2(vp.x * 0.20, vp.y * 0.74)
	_surface.queue_redraw()


# ── Input ───────────────────────────────────────────────────────────────────
# Raw events only. Real touches drive the touch path; once any real touch is seen the
# mouse path is disabled (emulate_mouse_from_touch would otherwise double-fire every tap).
# The mouse path stays live for desktop force-flag testing where no touchscreen exists.

func _input(event: InputEvent) -> void:
	if get_tree().paused or not Controls.use_touch_ui():
		return

	if event is InputEventScreenTouch:
		_saw_real_touch = true
		var t := event as InputEventScreenTouch
		_dbg_events += 1
		_dbg_last_pos = t.position
		if t.pressed:
			_touches[t.index] = t.position
			_on_press(t.index, t.position)
		else:
			_on_release(t.index, t.position)
			_touches.erase(t.index)
		_update_pinch_state()
		_surface.queue_redraw()
		get_viewport().set_input_as_handled()

	elif event is InputEventScreenDrag:
		var d := event as InputEventScreenDrag
		_dbg_events += 1
		_dbg_last_pos = d.position
		_touches[d.index] = d.position
		_on_drag(d.index, d.position)
		_surface.queue_redraw()
		get_viewport().set_input_as_handled()

	elif not _saw_real_touch and event is InputEventMouseButton:
		var mb := event as InputEventMouseButton
		if mb.button_index == MOUSE_BUTTON_LEFT:
			_dbg_events += 1
			_dbg_last_pos = mb.position
			if mb.pressed:
				_touches[_MOUSE] = mb.position
				_on_press(_MOUSE, mb.position)
			else:
				_on_release(_MOUSE, mb.position)
				_touches.erase(_MOUSE)
			_update_pinch_state()
			_surface.queue_redraw()

	elif not _saw_real_touch and event is InputEventMouseMotion:
		if _touch_owner.get(_MOUSE, null) == "stick":
			_touches[_MOUSE] = (event as InputEventMouseMotion).position
			_update_stick(_touches[_MOUSE])
			_surface.queue_redraw()


func _on_press(index: int, pos: Vector2) -> void:
	if _menu_rect.has_point(pos):
		_touch_owner[index] = "menu"
		return
	for slot: int in _ability_rects.size():
		if _ability_rects[slot].has_point(pos):
			_touch_owner[index] = slot
			if _player != null:
				_player.call(&"try_activate_ability", slot)
			return
	if _stick_zone.has_point(pos) and not _stick_active:
		_touch_owner[index] = "stick"
		_begin_stick(pos)
		return
	_touch_owner[index] = "camera"


func _on_drag(index: int, pos: Vector2) -> void:
	match _touch_owner.get(index, null):
		"stick":
			_update_stick(pos)
		"camera":
			if _pinching:
				_apply_pinch()


func _on_release(index: int, pos: Vector2) -> void:
	match _touch_owner.get(index, null):
		"stick":
			_end_stick()
		"menu":
			if _menu_rect.has_point(pos):
				_touch_owner.erase(index)
				_return_to_menu()
				return
	_touch_owner.erase(index)


# ── Joystick ────────────────────────────────────────────────────────────────

func _begin_stick(pos: Vector2) -> void:
	_stick_active = true
	_origin = pos
	_knob = pos


func _update_stick(pos: Vector2) -> void:
	if not _stick_active:
		return
	var offset := pos - _origin
	if offset.length() > _stick_radius:
		offset = offset.normalized() * _stick_radius
	_knob = _origin + offset
	_apply_move(offset / _stick_radius)


func _end_stick() -> void:
	_stick_active = false
	_release_move()


# Translate a normalised stick offset (screen space: +x right, +y down) into analog
# strengths on the four movement actions. Opposite pairs are mutually exclusive, so only
# one of each axis is ever pressed at a time.
func _apply_move(v: Vector2) -> void:
	Input.action_press(_MOVE_RIGHT,   maxf(0.0,  v.x))
	Input.action_press(_MOVE_LEFT,    maxf(0.0, -v.x))
	Input.action_press(_MOVE_BACK,    maxf(0.0,  v.y))
	Input.action_press(_MOVE_FORWARD, maxf(0.0, -v.y))


func _release_move() -> void:
	for action: StringName in [_MOVE_RIGHT, _MOVE_LEFT, _MOVE_BACK, _MOVE_FORWARD]:
		Input.action_release(action)


# ── Pinch-to-zoom ─────────────────────────────────────────────────────────────
# Only "camera" fingers (open right-side area, not on a button) participate, so it can't
# fire while the player is steering or tapping abilities.

func _camera_touches() -> Array:
	var pts: Array = []
	for idx: int in _touches:
		if _touch_owner.get(idx, null) == "camera":
			pts.append(_touches[idx])
	return pts


func _update_pinch_state() -> void:
	var pts := _camera_touches()
	var was := _pinching
	_pinching = pts.size() >= 2
	if _pinching and not was:
		if _stick_active:
			_end_stick()
		_pinch_dist = (pts[0] as Vector2).distance_to(pts[1] as Vector2)
	elif was and not _pinching:
		_pinch_dist = 0.0


func _apply_pinch() -> void:
	var pts := _camera_touches()
	if pts.size() < 2:
		return
	var dist := (pts[0] as Vector2).distance_to(pts[1] as Vector2)
	if _pinch_dist <= 0.0 or dist <= 0.0:
		_pinch_dist = dist
		return
	var cam := get_viewport().get_camera_3d()
	if cam != null and cam.has_method(&"adjust_zoom"):
		cam.call(&"adjust_zoom", dist / _pinch_dist)
	_pinch_dist = dist


# ── Drawing ───────────────────────────────────────────────────────────────────

func _draw_surface() -> void:
	for slot: int in _ability_rects.size():
		var r: Rect2 = _ability_rects[slot]
		_surface.draw_style_box(_ability_style[slot], r)
		var inner := r.grow(-r.size.x * 0.14)
		if _ability_tex[slot] != null:
			_draw_icon_fit(_ability_tex[slot], inner)
		else:
			_draw_centered_text(_ABILITY_LETTERS[slot], r, 40, _ABILITY_ACCENT[slot])
		var frac := 0.0
		if _player != null:
			frac = clampf(_player.call(&"ability_cooldown_fraction", slot), 0.0, 1.0)
		if frac > 0.0:
			var ch := r.size.y * frac
			_surface.draw_rect(
				Rect2(r.position.x, r.position.y + r.size.y - ch, r.size.x, ch),
				Color(0.0, 0.0, 0.0, 0.55))

	_surface.draw_style_box(_menu_style, _menu_rect)
	_draw_hamburger(_menu_rect)

	if _stick_active:
		_surface.draw_circle(_origin, _stick_radius, Color(0.0, 0.0, 0.0, 0.20))
		_surface.draw_arc(
			_origin, _stick_radius, 0.0, TAU, 48, Color(0.93, 0.88, 0.72, 0.30), 4.0, true)
		_surface.draw_circle(_knob, _stick_radius * 0.42, Color(1.00, 0.82, 0.32, 0.55))
	elif not _pinching:
		_draw_stick_hint()

	if Controls.debug_overlay():
		_draw_debug()


# A faint "ghost" joystick at rest in the lower-left with a caption, so the movement zone
# is discoverable. Breathes gently via _hint_pulse; vanishes the moment the stick is grabbed.
func _draw_stick_hint() -> void:
	var a := 0.16 + 0.12 * (0.5 + 0.5 * sin(_hint_pulse))
	var c := _stick_hint_center
	var r := _stick_radius * 0.72
	_surface.draw_circle(c, r, Color(0.0, 0.0, 0.0, a * 0.45))
	_surface.draw_arc(c, r, 0.0, TAU, 40, Color(0.93, 0.88, 0.72, a + 0.14), 3.0, true)
	_surface.draw_circle(c, r * 0.32, Color(1.00, 0.82, 0.32, a + 0.16))
	var font := ThemeDB.fallback_font
	if font != null:
		var txt := "DRAG TO MOVE"
		var fs := 18
		var tw := font.get_string_size(txt, HORIZONTAL_ALIGNMENT_LEFT, -1, fs)
		_surface.draw_string(
			font, c + Vector2(-tw.x * 0.5, r + 28.0), txt, HORIZONTAL_ALIGNMENT_LEFT, -1, fs,
			Color(0.93, 0.88, 0.72, a + 0.30))


func _draw_icon_fit(tex: Texture2D, box: Rect2) -> void:
	var ts := tex.get_size()
	if ts.x <= 0.0 or ts.y <= 0.0:
		return
	var scale := minf(box.size.x / ts.x, box.size.y / ts.y)
	var ds := ts * scale
	_surface.draw_texture_rect(tex, Rect2(box.position + (box.size - ds) * 0.5, ds), false)


func _draw_centered_text(text: String, box: Rect2, size: int, color: Color) -> void:
	var font := ThemeDB.fallback_font
	if font == null:
		return
	var tw := font.get_string_size(text, HORIZONTAL_ALIGNMENT_LEFT, -1, size)
	var pos := box.position + (box.size - tw) * 0.5 + Vector2(0.0, tw.y * 0.35)
	_surface.draw_string(font, pos, text, HORIZONTAL_ALIGNMENT_LEFT, -1, size, color)


# Three stacked bars — a "☰" glyph drawn by hand, since the fallback font that ships with
# the web build has no U+2630 and renders it as tofu / a codepoint number.
func _draw_hamburger(r: Rect2) -> void:
	var col := Color(1.00, 0.78, 0.22)
	var bw := r.size.x * 0.5
	var bh := maxf(3.0, r.size.y * 0.09)
	var x := r.position.x + (r.size.x - bw) * 0.5
	var cy := r.position.y + r.size.y * 0.5
	var gap := r.size.y * 0.22
	for i: int in [-1, 0, 1]:
		_surface.draw_rect(Rect2(x, cy + i * gap - bh * 0.5, bw, bh), col)


func _draw_debug() -> void:
	var font := ThemeDB.fallback_font
	if font == null:
		return
	var players := get_tree().get_nodes_in_group(&"player")
	var mats := get_tree().get_nodes_in_group(&"matador")
	var lines := [
		"GPU: %s" % RenderingServer.get_video_adapter_name(),
		"API: %s" % RenderingServer.get_video_adapter_api_version(),
		"method=%s  web=%s  touch_ui=%s" % [
			ProjectSettings.get_setting("rendering/renderer/rendering_method", "?"),
			OS.has_feature("web"), Controls.use_touch_ui()],
		"bull: %s" % _node_report(players),
		"matador(%d): %s" % [mats.size(), _node_report(mats)],
		"events=%d  last=%s  touches=%d  stick=%s" % [
			_dbg_events, str(_dbg_last_pos.round()), _touches.size(), _stick_active],
	]
	var fs := 18
	var line_h := 24.0
	var w := 0.0
	for line: String in lines:
		w = maxf(w, font.get_string_size(line, HORIZONTAL_ALIGNMENT_LEFT, -1, fs).x)
	_surface.draw_rect(
		Rect2(10.0, 34.0, w + 16.0, line_h * lines.size() + 12.0), Color(0.0, 0.0, 0.0, 0.62))
	var y := 34.0 + 22.0
	for line: String in lines:
		_surface.draw_string(
			font, Vector2(18.0, y), line, HORIZONTAL_ALIGNMENT_LEFT, -1, fs,
			Color(1.0, 1.0, 0.3))
		y += line_h


# One-line "does this character exist / is it drawable / where is it" report for the debug
# overlay, so an invisible bull/matador on-device can be pinned to spawn vs. position vs.
# GPU-draw failure.
func _node_report(nodes: Array) -> String:
	if nodes.is_empty():
		return "NONE"
	var n := nodes[0] as Node3D
	if n == null:
		return "not Node3D"
	return "vis=%s pos=%s" % [n.is_visible_in_tree(), str(n.global_position.round())]


func _button_style(accent: Color) -> StyleBoxFlat:
	var s := StyleBoxFlat.new()
	s.bg_color = Color(0.10, 0.07, 0.03, 0.80)
	s.set_corner_radius_all(18)
	s.corner_detail = 6
	s.set_border_width_all(3)
	s.border_color = accent
	return s


# ── 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")


# ── Lifecycle ─────────────────────────────────────────────────────────────────

func _process(delta: float) -> void:
	_hint_pulse = fmod(_hint_pulse + delta * 2.2, TAU)
	var active := Controls.use_touch_ui() and not get_tree().paused
	# The game-over / pause screen owns the display when paused — stand down and drop any
	# held movement so the bull doesn't coast on a stuck joystick.
	if not active:
		if _surface.visible:
			_surface.visible = false
			if _stick_active:
				_end_stick()
			_touches.clear()
			_touch_owner.clear()
			_pinching = false
		return

	_surface.visible = true
	if _player == null:
		var players := get_tree().get_nodes_in_group(&"player")
		if not players.is_empty():
			_player = players[0]
	_surface.queue_redraw()   # cooldown overlays animate every frame