extends Node2D
@export var shield_radius := 50.0
var current_shields := 100.0
var max_shields := 100.0
var _hit_flash_timer := 0.0
var _hits: Array[Dictionary] = []
var _time := 0.0

func _ready() -> void:
	var owner := get_parent()
	if owner is CharacterBody2D and owner.has_method("take_damage"):
		owner.add_to_group("shielded_combatants")

func _process(delta: float) -> void:
	_time += delta
	_hit_flash_timer = maxf(0.0,_hit_flash_timer-delta)
	for i in range(_hits.size()-1,-1,-1):
		_hits[i].age += delta
		if _hits[i].age >= 0.42: _hits.remove_at(i)
	visible = current_shields > 0.0 or not _hits.is_empty()
	var owner := get_parent()
	if owner.has_method("is_mini_boosting") and bool(owner.get("_is_destroyed")): visible = false
	if visible: queue_redraw()

func set_shield_values(current: float, maximum: float) -> void:
	current_shields = current
	max_shields = maxf(1.0,maximum)
	visible = current_shields > 0.0 or not _hits.is_empty()
	queue_redraw()

func flash_hit(world_point := Vector2.INF, damage_type := DamageTypes.Type.ENERGY, strength := 1.0) -> void:
	_hit_flash_timer = 0.22
	var direction := Vector2.UP if not world_point.is_finite() else to_local(world_point).normalized()
	if direction.length_squared()<0.01: direction = Vector2.UP
	if _hits.size()>=6: _hits.pop_front()
	_hits.append({"angle":direction.angle(),"age":0.0,"kind":damage_type,"strength":clampf(strength,0.4,1.4)})
	visible = true
	queue_redraw()

func _draw() -> void:
	var ratio := clampf(current_shields/max_shields,0.0,1.0)
	if current_shields>0:
		var pulse := 0.88+0.12*sin(_time*1.8)
		var intensity := (0.35+ratio*0.65)*pulse
		var tint := Color("61d8ff").lerp(Color("a4edff"),ratio*0.35)
		# A soft Fresnel-like rim: transparent centre, luminous outer shell.
		draw_circle(Vector2.ZERO,shield_radius,Color(tint,0.012*intensity))
		for layer in range(5,0,-1):
			draw_arc(Vector2.ZERO,shield_radius,0,TAU,96,Color(tint,0.012*intensity),float(layer)*2.6,true)
		for band in 4:
			draw_arc(Vector2.ZERO,shield_radius-1.5-band*1.6,0,TAU,96,Color(tint,0.018*intensity*(1.0-band/4.0)),2.0,true)
		draw_arc(Vector2.ZERO,shield_radius,0,TAU,96,Color(tint,0.34*intensity),1.1,true)
		# Slow highlights travel along the field without shifting its collision edge.
		for index in 3:
			var angle := _time*0.16+TAU*index/3.0
			for segment in 8:
				var start := angle+segment*0.065
				var alpha := sin((segment+0.5)/8.0*PI)*0.22*intensity
				draw_arc(Vector2.ZERO,shield_radius-0.6,start,start+0.07,5,Color("d0f6ff",alpha),1.6,true)
	_draw_impacts()

func _draw_impacts() -> void:
	for hit in _hits:
		var t := float(hit.age)/0.42
		var fade := (1.0-t)*(1.0-t)*float(hit.strength)
		var color: Color = [Color("ffd18b"),Color("75dfff"),Color("a1f475")][int(hit.kind)]
		var angle: float = hit.angle
		var spread := 0.12+t*1.2
		var radius := shield_radius+t*2.0
		for layer in 3:
			draw_arc(Vector2.ZERO,radius-float(layer)*1.5,angle-spread,angle+spread,28,Color(color,fade*(0.6 if layer==0 else 0.13)),1.4 if layer==0 else 3.0,true)
		var contact := Vector2.RIGHT.rotated(angle)*shield_radius
		draw_circle(contact,8.0*(1.0-t),Color(color,fade*0.12))
		for ring in 2:
			draw_arc(contact,3.0+t*(17.0+ring*8.0),angle+PI*0.5,angle+PI*1.5,22,Color(color,fade*(0.5 if ring==0 else 0.17)),1.1,true)
		if t<0.35:
			var core := (1.0-t/0.35)*float(hit.strength)
			draw_circle(contact,5*core,Color(color,core*0.22))
			draw_circle(contact,1.8*core,Color(color.lightened(0.7),core))