extends Node2D

const ENEMY := preload("res://scenes/game/enemy_ship.tscn")

func _ready() -> void:
	GameState.start_new_run()
	var enemy := ENEMY.instantiate()
	add_child(enemy)
	enemy.set_physics_process(false)
	enemy.absorption = Vector3.ZERO
	enemy.max_hull = 125.0
	enemy.hull = 125.0
	enemy.max_shields = 50.0
	enemy.shields = 50.0
	# Four hits consume the shield; none of that absorbed damage reaches hull.
	for hit in 4:
		enemy.take_research_weapon_hit(12.5,false,DamageTypes.Type.ENERGY,0.0,-1)
		assert(is_equal_approx(enemy.hull,125.0))
	assert(enemy.shields == 0.0 and not enemy.is_queued_for_deletion())
	# Regeneration immediately restores a fraction of a point, making the ring visible again.
	enemy.regenerate_defenses(0.1)
	assert(is_equal_approx(enemy.shields,0.05))
	enemy.take_research_weapon_hit(12.5,false,DamageTypes.Type.ENERGY,0.0,-1)
	assert(is_equal_approx(enemy.hull,112.55))
	# Overflow applies only the unabsorbed portion, including research multipliers.
	enemy.hull = 125.0
	enemy.shields = 5.0
	enemy.take_research_weapon_hit(15.0,false,DamageTypes.Type.ENERGY,0.0,-1)
	assert(enemy.shields == 0.0 and is_equal_approx(enemy.hull,115.0))
	GameState.captain.expedition.alien_skills = {"shields":true,"hull":true}
	enemy.hull = 125.0
	enemy.shields = 11.0
	enemy.take_research_weapon_hit(20.0,false,DamageTypes.Type.ENERGY,0.0,-1)
	assert(is_equal_approx(enemy.hull,114.0))
	GameState.captain.expedition.alien_skills.clear()
	# A projectile hitting both shield interception and hull can only damage once.
	enemy.hull = 125.0
	enemy.shields = 0.0
	var projectile := preload("res://scenes/game/weapon_projectile.tscn").instantiate()
	projectile.configure(Vector2.ZERO,Vector2.RIGHT,ItemDefinition.WeaponKind.PLASMA,500,12.5,500)
	add_child(projectile)
	projectile.set_physics_process(false)
	projectile._apply_damage_once(enemy)
	projectile._apply_damage_once(enemy)
	assert(is_equal_approx(enemy.hull,112.5))
	# Full hull takes ten additional 12.5-damage hits after an exactly depleted shield.
	enemy.hull = 125.0
	enemy.shields = 0.0
	for hit in 9:
		enemy.take_research_weapon_hit(12.5,false,DamageTypes.Type.ENERGY,0.0,-1)
		assert(enemy.hull > 0.0 and not enemy.is_queued_for_deletion())
	assert(is_equal_approx(enemy.hull,12.5))
	enemy.take_research_weapon_hit(12.5,false,DamageTypes.Type.ENERGY,0.0,-1)
	assert(enemy.hull == 0.0 and enemy.is_queued_for_deletion())
	print("ENEMY SHIELD DAMAGE AUDIT PASS: no hull damage under full absorption, exact shield break survives, correct overflow/research scaling, no duplicate projectile damage, 10 hull hits after shield break; instant 0.05 shield regeneration confirmed")
	await get_tree().process_frame
	get_tree().quit()