class_name PlanetSetupHost
extends Node2D

# Instantiates the contents of a PlanetSetup onto a landed surface: one enemy
# per authored spawn, registered with GameState as the planet's garrison so
# that killing the last of them takes the planet.
#
# #211 removed the capture points this used to place alongside them. Holding a
# ring for four seconds, once per ring, was a second task laid on top of the
# fight the player had already won; conquest is the fight now.

const ENEMY_SCENE: PackedScene = preload("res://enemies/Enemy.tscn")

var setup: Resource


func apply_setup(new_setup: Resource) -> void:
	setup = new_setup
	for child in get_children():
		child.queue_free()
	if setup == null:
		return

	# Registered with the count about to be placed, every landing. A planet
	# already taken keeps that status and gets no garrison at all.
	GameState.register_planet_garrison(GameState.planet_id,
		setup.enemy_spawns.size(), GameState.planet_definition_id,
		int(setup.research_point_reward))
	if GameState.is_planet_conquered(GameState.planet_id):
		return
	for spawn in setup.enemy_spawns:
		_add_enemy(spawn)


func _add_enemy(spawn: Resource) -> void:
	var enemy: Node = ENEMY_SCENE.instantiate()
	enemy.enemy_id = spawn.enemy_id
	enemy.position = spawn.position
	# The planet is captured by the count reaching zero, so the tally is bound
	# to the enemy's own death rather than to whatever killed it. Bound to the
	# id captured NOW: the player may have left the surface by the time a
	# straggler dies, and the planet that was being fought over is this one.
	var planet_key: String = GameState.planet_id
	enemy.destroyed.connect(func():
		GameState.mark_garrison_enemy_destroyed(planet_key))
	add_child(enemy)