spaceship/boss/BossEncounter.gd

class_name BossEncounter
extends Node2D

@onready var boss: Node2D = $Boss
@onready var fleet: Node2D = get_node("../../Fleet")
@onready var camera: Camera2D = get_node("../../Camera2D")
@onready var health_caption: Label = $EncounterUI/HealthCaption
@onready var status_label: Label = $EncounterUI/StatusLabel
@onready var hint_label: Label = $EncounterUI/HintLabel
@onready var health_bar: ProgressBar = $EncounterUI/HealthBar
@onready var indicator: Control = $EncounterUI/BossIndicator
@onready var indicator_label: Label = $EncounterUI/IndicatorLabel
@onready var game_state: Node = get_node("/root/GameState")

const REVEAL_SECONDS: float = 1.15
const REVEAL_SHAKE: float = 28.0

var reveal_started: bool = false
var reveal_left: float = 0.0
var encounter_active: bool = false


func _ready() -> void:
	# One persistent objective lets boss victory flow through the same conquest
	# state as authored capture-point maps without pretending the boss is a
	# configurable capture point.
	game_state.register_capture_points(game_state.planet_id, 1,
		game_state.planet_definition_id)
	if game_state.is_planet_conquered(game_state.planet_id):
		boss.suppress_as_defeated()
		health_bar.max_value = boss.max_health()
		health_bar.value = 0
		health_caption.visible = false
		health_bar.visible = false
		indicator.visible = false
		indicator_label.visible = false
		status_label.text = "THE WARDEN IS DEAD"
		hint_label.text = ""
		return
	boss.defeated.connect(_on_boss_defeated)
	boss.phase_changed.connect(_on_boss_phase_changed)
	boss.health_changed.connect(_on_boss_health_changed)
	health_bar.max_value = boss.max_health()
	health_bar.value = boss.current_health()
	boss.set_combat_active(false)
	_set_combat_ui_visible(false)
	indicator.visible = true
	indicator_label.visible = true
	# The signal is a destination, not an autopilot order. The player keeps
	# control while approaching it; only the short reveal below takes the wheel.
	_refresh_status()


func _exit_tree() -> void:
	if game_state != null:
		game_state.encounter_locks_movement = false
	if camera != null:
		camera.offset = Vector2.ZERO


func _process(delta: float) -> void:
	if boss.phase == boss.Phase.DEFEATED:
		return
	if not reveal_started:
		_update_indicator()
		if _boss_reaches_view():
			begin_reveal()
		return
	if encounter_active:
		return
	reveal_left -= delta
	var strength: float = REVEAL_SHAKE * clampf(reveal_left / REVEAL_SECONDS, 0.0, 1.0)
	camera.offset = Vector2(randf_range(-strength, strength), randf_range(-strength, strength))
	if reveal_left <= 0.0:
		camera.offset = Vector2.ZERO
		encounter_active = true
		boss.set_combat_active(true)
		game_state.encounter_locks_movement = false


func begin_reveal() -> void:
	if reveal_started or boss.phase == boss.Phase.DEFEATED:
		return
	reveal_started = true
	reveal_left = REVEAL_SECONDS
	game_state.encounter_locks_movement = true
	fleet.stop()
	indicator.visible = false
	indicator_label.visible = false
	_set_combat_ui_visible(true)
	status_label.text = "THE WARDEN AWAKENS"
	hint_label.text = ""
	Sfx.play(get_tree(), Sfx.BOSS_SCREAM)


func _set_combat_ui_visible(shown: bool) -> void:
	for control in [health_caption, health_bar, status_label, hint_label]:
		control.visible = shown


func _boss_reaches_view() -> bool:
	# World-space math is immediate. The viewport canvas transform trails a
	# Camera2D assignment until the render server updates, which made a fast
	# approach able to cross the threshold one frame before the detector saw
	# it. Including the tentacle reach makes the reveal begin when the first
	# part of the creature actually touches the view.
	var half_view: Vector2 = get_viewport_rect().size * 0.5 / camera.zoom
	var extent: float = boss.TENTACLE_LENGTH * boss.scale.x
	var separation: Vector2 = (boss.global_position - camera.global_position).abs()
	return separation.x <= half_view.x + extent \
		and separation.y <= half_view.y + extent


func _update_indicator() -> void:
	var viewport_size: Vector2 = get_viewport_rect().size
	var screen_at: Vector2 = get_viewport().get_canvas_transform() * boss.global_position
	var from_center: Vector2 = screen_at - viewport_size * 0.5
	if from_center == Vector2.ZERO:
		from_center = Vector2.UP
	var half: Vector2 = indicator.size * 0.5
	indicator.position = Vector2(
		clampf(screen_at.x - half.x, 24.0, viewport_size.x - indicator.size.x - 24.0),
		clampf(screen_at.y - half.y, 170.0, viewport_size.y - indicator.size.y - 24.0))
	indicator.rotation = from_center.angle() + PI / 2.0
	indicator_label.position.x = clampf(indicator.position.x - 90.0,
		24.0, viewport_size.x - indicator_label.size.x - 24.0)
	indicator_label.position.y = indicator.position.y + indicator.size.y + 8.0


func _refresh_status() -> void:
	var phase_name: String = "PHASE III · EXPOSED CORE" if boss.phase == boss.Phase.CORE_EXPOSED \
		else ("PHASE II · LASER STORM" if boss.phase == boss.Phase.LASER_STORM \
		else "PHASE I · HATCHLINGS")
	status_label.text = "THE WARDEN · %s · EYES %d/%d" % [
		phase_name, boss.eyes_destroyed, boss.EYE_COUNT]
	hint_label.text = "GOLDEN HATCHLINGS APPEAR EVERY THIRD WAVE · BREAK THE EYES, THEN THE CORE"


func _on_boss_phase_changed(_phase: int) -> void:
	if boss.phase != boss.Phase.DEFEATED:
		_refresh_status()


func _on_boss_health_changed(current: int, maximum: int) -> void:
	health_bar.max_value = maximum
	health_bar.value = current
	_refresh_status()


func _on_boss_defeated() -> void:
	game_state.encounter_locks_movement = false
	camera.offset = Vector2.ZERO
	game_state.mark_point_captured(game_state.planet_id, 0)
	health_bar.value = 0
	status_label.text = "THE WARDEN IS DEAD · PLANET CONQUERED"
	hint_label.text = ""