class_name Camera
extends Camera3D

@export_group("Zoom")
@export var zoom_speed := 0.5
@export var zoom_interpolation := 10.0
@export var zoom_min := 2.0
@export var zoom_max := 8.0

var target_distance: float

func _ready():
	target_distance = position.z
	Global.camera = self

func _input(event):
	if event.is_action_pressed("zoom_in", true):
		target_distance -= zoom_speed
		on_distance_changed()
		get_viewport().set_input_as_handled()
	
	if event.is_action_pressed("zoom_out", true):
		target_distance += zoom_speed
		on_distance_changed()
		get_viewport().set_input_as_handled()

func on_distance_changed():
	target_distance = clampf(target_distance, zoom_min, zoom_max)
	Global.camera_attributes.dof_blur_far_distance = target_distance + 1.0

func is_below_terrain():
	return %CameraRays.occlusion_point.y > global_position.y

func _process(delta):
	var distance := target_distance

	if %CameraRays.occlusion_distance < target_distance:
		distance = %CameraRays.occlusion_distance - 0.5

		if is_below_terrain():
			position.z = distance
			return

	if abs(distance - position.z) < 0.01:
		return
	
	position.z = lerpf(position.z, distance, zoom_interpolation * delta)