@tool
extends Area3D
class_name Hitbox
## A designer-placeable attack hitbox: drop this into a scene, give it a CollisionShape3D
## child, and drag the shape to size/position the attack's reach in the editor. The shape
## itself decides what got hit — no distance/facing math in code.
##
## Inactive by default; the owning script calls activate() for the swing's active window and
## deactivate() when it ends. Each activation only hits a given body once (the bull's own
## i-frames also collapse a flurry, but this keeps a single swing from re-triggering).

const PhysicsLayers = preload("res://physics_layers.gd")

## How the hit is tagged on the bull's take_sword_hit ("mauled" / "gored" / …).
@export var damage_cause: String = "mauled"
## Upward launch (m/s) applied to the bull on hit — e.g. an overhead smash that pops it up.
@export var knock_up: float = 0.0
## Knock-up distance shaping, measured planar (XZ) from this hitbox's own origin to the body:
## below `knock_up_min_dist` no pop is applied (leap slam: only the outer ring launches). If
## `knock_up_max_dist` > min, the pop ramps 0→`knock_up` from min to max (overhead smash: the
## further out the hit lands, the higher the bull flies); at/again 0 it's full past the min.
@export var knock_up_min_dist: float = 0.0
@export var knock_up_max_dist: float = 0.0

var _active: bool = false
var _hit_this_swing: Dictionary = {}
# Whether the most recent active window connected. Cleared on activate(), NOT deactivate(), so the
# owner can read it after the window closes (e.g. a landed stab breaks off to taunt).
var _did_hit: bool = false


func _ready() -> void:
	# Detect the bull's body (layer BULL) only; never collide or push physics.
	collision_layer = 0
	collision_mask = PhysicsLayers.BULL
	monitorable = false
	monitoring = false
	if Engine.is_editor_hint():
		return
	body_entered.connect(_on_body_entered)


func activate() -> void:
	if _active:
		return
	_active = true
	_hit_this_swing.clear()
	_did_hit = false
	monitoring = true


func deactivate() -> void:
	_active = false
	monitoring = false


# Did the window that just closed connect? Valid until the next activate() clears it.
func did_hit() -> bool:
	return _did_hit


func _on_body_entered(body: Node3D) -> void:
	_apply_hit(body)


# For AoE slams the bull is usually already standing inside the shape when it activates, so
# body_entered never fires. The owner calls sweep() each active frame to catch current overlaps
# (still deduped per activation, so the bull is only hit once per slam).
func sweep() -> void:
	if not _active:
		return
	for body in get_overlapping_bodies():
		_apply_hit(body)


func _apply_hit(body: Node3D) -> void:
	if not _active or not body.is_in_group(&"player"):
		return
	if _hit_this_swing.has(body):
		return
	_hit_this_swing[body] = true
	_did_hit = true
	body.call(&"take_sword_hit", damage_cause)
	if knock_up > 0.0:
		var v := _knock_up_for(body)
		if v > 0.0:
			body.call(&"apply_knock_up", v)


# Scale the pop by how far the body is from this hitbox's origin (planar). See the export docs.
func _knock_up_for(body: Node3D) -> float:
	if knock_up_min_dist <= 0.0 and knock_up_max_dist <= 0.0:
		return knock_up
	var to := body.global_position - global_position
	var d := Vector2(to.x, to.z).length()
	if d < knock_up_min_dist:
		return 0.0
	if knock_up_max_dist > knock_up_min_dist:
		var t := clampf((d - knock_up_min_dist) / (knock_up_max_dist - knock_up_min_dist), 0.0, 1.0)
		return knock_up * t
	return knock_up