class_name TriggerArea
extends Node2D
## TriggerArea - Placeable rectangular sensor for the Sandbox Stage (Phase 4).
##
## A drawn Node2D (NOT a physics Area2D) that the stage's geometric event engine
## polls for movable overlap. Purely visual plus a size query; no signals, no
## physics. Draws a translucent green fill with a dashed green border so it reads
## as a trigger zone in EDIT mode. World-space child, so no zoom division is
## needed for the dashed border.

## Half-extents of the rectangular sensor in local space.
@export var size: Vector2 = Vector2(96.0, 96.0):
	set(value):
		size = value
		queue_redraw()


## Local-space rectangle (centered on the node origin) used for overlap tests.
func get_area_rect() -> Rect2:
	return Rect2(-size * 0.5, size)


func _draw() -> void:
	var rect := get_area_rect()
	draw_rect(rect, Color(0.2, 0.8, 0.3, 0.12), true)
	_draw_dashed_rect(rect, Color(0.2, 0.8, 0.3, 0.6), 2.0, 6.0, 4.0)


## Dashed border along each edge of `rect` (top/right/bottom/left), drawn with a
## small manual dash loop using draw_line.
func _draw_dashed_rect(rect: Rect2, color: Color, width: float, dash: float, gap: float) -> void:
	var tl := rect.position
	var tr := rect.position + Vector2(rect.size.x, 0.0)
	var br := rect.position + rect.size
	var bl := rect.position + Vector2(0.0, rect.size.y)
	_draw_dashed_edge(tl, tr, color, width, dash, gap)
	_draw_dashed_edge(tr, br, color, width, dash, gap)
	_draw_dashed_edge(br, bl, color, width, dash, gap)
	_draw_dashed_edge(bl, tl, color, width, dash, gap)


func _draw_dashed_edge(from: Vector2, to: Vector2, color: Color, width: float, dash: float, gap: float) -> void:
	var dir := from.direction_to(to)
	var total := from.distance_to(to)
	var dist := 0.0
	while dist < total:
		var start := from + dir * dist
		var len := minf(dash, total - dist)
		draw_line(start, start + dir * len, color, width, true)
		dist += dash + gap