extends Node
class_name StateWallCling

var machine: MovementStateMachine
var params: MovementParams:
	get: return machine.params

var elapsed: float = 0.0
var stamina: float = 0.0


func enter(_data: Dictionary = {}) -> void:
	elapsed = 0.0
	stamina = params.wall_cling_max_stamina
	machine.register_chain_mechanic("wall_cling")
	# Kill most velocity but keep slight downward
	machine.player.velocity = Vector3.ZERO


func exit() -> void:
	pass


func update(delta: float) -> void:
	elapsed += delta
	stamina -= params.wall_cling_stamina_drain * delta

	var player := machine.player
	var vel: Vector3 = player.velocity

	# ── Slow slide down ───────────────────────────────────────────────────
	var slide_factor := 1.0 - (stamina / params.wall_cling_max_stamina)  # 0→1 as stamina drains
	vel.x = 0.0
	vel.z = 0.0
	vel.y = params.wall_cling_slide_speed * (1.0 + slide_factor * 2.0)

	# Push into wall to maintain contact
	vel -= machine.wall_normal * 1.0

	player.velocity = vel
	player.move_and_slide()

	# ── Stamina depleted → fall ───────────────────────────────────────────
	if stamina <= 0.0:
		machine.wall_normal = Vector3.ZERO
		machine.wall_side = 0.0
		machine.switch_to("air")
		return

	# ── Jump off wall ─────────────────────────────────────────────────────
	if machine.input_jump_just_pressed and machine.jump_cooldown_timer <= 0.0:
		var push_dir := machine.wall_normal * params.wall_run_jump_off_normal
		player.velocity = Vector3(push_dir.x, params.jump_velocity, push_dir.z)
		machine.wall_normal = Vector3.ZERO
		machine.wall_side = 0.0
		machine.wall_cooldown_timer = 0.3
		machine.register_chain_mechanic("wall_cling_jump")
		machine.jump_cooldown_timer = params.jump_cooldown
		machine.switch_to("air")
		return

	# ── Re-enter wall run with movement input ─────────────────────────────
	if machine.input_dir.length() > 0.1:
		machine.switch_to("wall_run")
		return

	# ── Lost wall contact ─────────────────────────────────────────────────
	var wall := machine.detect_wall_horizontal()
	if wall == Vector3.ZERO:
		machine.wall_normal = Vector3.ZERO
		machine.wall_side = 0.0
		machine.switch_to("air")
		return

	# ── Hit floor ─────────────────────────────────────────────────────────
	if player.is_on_floor():
		machine.on_ground = true
		machine.wall_normal = Vector3.ZERO
		machine.wall_side = 0.0
		machine.switch_to("ground")