extends Node
class_name GrabController

## The hands half of the record ritual. Lives under Player and is driven BY Player's
## input (Player already owns the mouse), so there is no _input() here to fight over
## event ordering — Player calls try_grab()/feed_drag()/primary()/drop() directly.
##
## Flow:
##   E ............. grab the Record under the crosshair -> it lifts to the hand
##   drag mouse X .. slide the disc up and out of the sleeve (feed_drag)
##   LMB ........... throw the freed disc (then a second LMB trashes the empty sleeve)
##   G ............. drop / trash whatever's in hand
##
## Godot 4.7 GDScript 2.0.

const GRAB_REACH := 2.0        ## metres in front of the camera a record is grabbable
const GRAB_RADIUS := 0.55      ## forgiving fat sphere, same idea as MeleeAttack
const DRAG_FULL_PX := 600.0    ## pixels of horizontal drag == one full disc pull
const THROW_FORCE := 6.5       ## impulse handed to a chucked disc

var _cam: Camera3D
var _hold_point: Node3D
var _held: Record = null

# extract meter UI
var _meter_root: Control
var _meter_fill: ColorRect

func setup(cam: Camera3D) -> void:
	_cam = cam
	_hold_point = Node3D.new()
	_hold_point.name = "HoldPoint"
	_cam.add_child(_hold_point)
	_hold_point.position = Vector3(0.0, -0.1, -0.5)   # a touch below + in front of the eye
	_build_meter()

# ---------------------------------------------------------------- grab
## Grab the nearest Record under the crosshair, if any within reach. Fat-sphere query
## against the physics space (mirrors MeleeAttack.strike) filtered to Record bodies.
func try_grab() -> void:
	if _held != null:
		return                     # already holding — E is grab-only
	if _cam == null:
		return
	var space := _cam.get_world_3d().direct_space_state
	if space == null:
		return
	var origin := _cam.global_position
	var dir := -_cam.global_transform.basis.z

	var sphere := SphereShape3D.new()
	sphere.radius = GRAB_RADIUS
	var params := PhysicsShapeQueryParameters3D.new()
	params.shape = sphere
	params.transform = Transform3D(Basis.IDENTITY, origin + dir * (GRAB_REACH * 0.5))
	params.collide_with_bodies = true
	params.collide_with_areas = false

	var hits := space.intersect_shape(params, 12)
	var best: Record = null
	var best_d := INF
	for h in hits:
		var col = h.get("collider")
		if col is Record and (col as Record).is_extractable():
			var d: float = (col.global_position - origin).length_squared()
			if d < best_d:
				best_d = d
				best = col
	if best != null:
		best.grab(_hold_point)
		_held = best

# ---------------------------------------------------------------- extract
## Feed horizontal mouse motion into the held record's disc pull.
func feed_drag(dx: float) -> void:
	if _held == null or not _held.is_extractable():
		return
	_held.set_extract(_held.extract_amount() + dx / DRAG_FULL_PX)

# ---------------------------------------------------------------- primary (LMB)
## Two-stage: throw the freed disc, then a later click trashes the empty sleeve.
## Returns true if the click was consumed (so Player doesn't ALSO punch).
func primary() -> bool:
	if _held == null:
		return false
	if _held.has_disc_in_hand():
		var dir := -_cam.global_transform.basis.z if _cam != null else Vector3.FORWARD
		_held.throw_disc(dir, THROW_FORCE)          # disc leaves; sleeve stays in hand
	else:
		_held.drop()                                # trash the (empty or unopened) sleeve
		_held = null
	return true

# ---------------------------------------------------------------- drop (G)
func drop() -> void:
	if _held == null:
		return
	_held.drop()
	_held = null

# ---------------------------------------------------------------- queries
func is_holding() -> bool:
	return _held != null

## While pulling a disc, Player routes horizontal mouse to feed_drag() instead of yaw.
func is_extracting() -> bool:
	return _held != null and _held.is_extractable()

func held_record() -> Record:
	return _held

# ---------------------------------------------------------------- extract meter
func _build_meter() -> void:
	var layer := CanvasLayer.new()
	layer.name = "GrabHUD"
	add_child(layer)
	_meter_root = Control.new()
	_meter_root.set_anchors_preset(Control.PRESET_CENTER)
	_meter_root.visible = false
	layer.add_child(_meter_root)

	var bg := ColorRect.new()
	bg.color = Color(0, 0, 0, 0.5)
	bg.position = Vector2(-90, 40)
	bg.size = Vector2(180, 14)
	_meter_root.add_child(bg)

	_meter_fill = ColorRect.new()
	_meter_fill.color = Color(1.0, 0.36, 0.62, 0.95)
	_meter_fill.position = Vector2(-88, 42)
	_meter_fill.size = Vector2(0, 10)
	_meter_root.add_child(_meter_fill)

	var lbl := Label.new()
	lbl.text = "PULL  ←→"
	lbl.position = Vector2(-90, 18)
	lbl.add_theme_font_size_override("font_size", 13)
	_meter_root.add_child(lbl)

func _process(_dt: float) -> void:
	if _meter_root == null:
		return
	var pulling := is_extracting()
	_meter_root.visible = pulling
	if pulling and _meter_fill != null:
		_meter_fill.size.x = 176.0 * _held.extract_amount()