class_name DiveSite
extends Node3D

const SonarMaterial = preload("res://game/domain/sonar/sonar_material.gd")
const DiveSiteDefinition = preload("res://game/domain/sites/dive_site_definition.gd")
const SitePlacement = preload("res://game/domain/sites/site_placement.gd")
const BathymetricTerrainActor = preload(
	"res://game/world/sites/bathymetric_terrain_actor.gd"
)
const SeabedFloraActor = preload("res://game/world/sites/seabed_flora_actor.gd")

const METAL_REFLECTIVITY := 1.0
const BEACON_COLOR := Color(0.2, 0.78, 0.9)

@onready var _terrain: BathymetricTerrainActor = %Terrain
@onready var _flora: SeabedFloraActor = %Flora
@onready var _placements_root: Node3D = %Placements

var _definition: DiveSiteDefinition
var _placeholder_count := 0


func configure(definition: DiveSiteDefinition) -> String:
	if _terrain == null or _placements_root == null:
		return "dive site is not in the scene tree"
	if definition == null:
		return "dive site definition is missing"
	var field := definition.height_field()
	if field == null:
		return "dive site definition is invalid"
	var terrain_error := _terrain.configure(field)
	if not terrain_error.is_empty():
		return terrain_error
	if _flora != null:
		# The flora is seeded by the site id, so a site always grows the same meadows.
		var flora_error := _flora.configure(field, hash(String(definition.site_id)))
		if not flora_error.is_empty():
			return flora_error
	_definition = definition
	for child in _placements_root.get_children():
		_placements_root.remove_child(child)
		child.free()
	_placeholder_count = 0
	for placement: SitePlacement in definition.placements:
		_place(placement)
	return ""


func definition() -> DiveSiteDefinition:
	return _definition


func terrain() -> BathymetricTerrainActor:
	return _terrain


func flora() -> SeabedFloraActor:
	return _flora


func spawn_transform() -> Transform3D:
	return _definition.spawn_transform() if _definition != null else Transform3D.IDENTITY


func placeholder_count() -> int:
	return _placeholder_count


func _place(placement: SitePlacement) -> void:
	if placement.is_sonar_metal():
		_placements_root.add_child(_metal_placeholder(placement))
		_placeholder_count += 1
	elif placement.kind == SitePlacement.Kind.VESSEL_ANCHOR:
		_placements_root.add_child(_beacon(placement))
		_placeholder_count += 1


func _metal_placeholder(placement: SitePlacement) -> StaticBody3D:
	var body := StaticBody3D.new()
	body.name = String(placement.placement_id)
	body.position = placement.position_m
	body.rotation.y = placement.yaw_radians
	body.set_meta("sonar_material", SonarMaterial.Value.METAL)
	body.set_meta("sonar_reflectivity", METAL_REFLECTIVITY)
	var mesh := BoxMesh.new()
	mesh.size = placement.footprint_m
	var mesh_instance := MeshInstance3D.new()
	mesh_instance.name = "Mesh"
	mesh_instance.mesh = mesh
	var material := StandardMaterial3D.new()
	material.albedo_color = Color(0.24, 0.18, 0.08)
	material.metallic = 0.88
	material.roughness = 0.27
	mesh_instance.material_override = material
	body.add_child(mesh_instance)
	var shape := BoxShape3D.new()
	shape.size = placement.footprint_m
	var collision := CollisionShape3D.new()
	collision.name = "Collision"
	collision.shape = shape
	body.add_child(collision)
	return body


func _beacon(placement: SitePlacement) -> MeshInstance3D:
	var mesh := SphereMesh.new()
	mesh.radius = 0.55
	mesh.height = 1.1
	var beacon := MeshInstance3D.new()
	beacon.name = String(placement.placement_id)
	beacon.mesh = mesh
	beacon.position = placement.position_m
	var material := StandardMaterial3D.new()
	material.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
	material.albedo_color = BEACON_COLOR
	material.emission_enabled = true
	material.emission = BEACON_COLOR
	material.emission_energy_multiplier = 5.0
	beacon.material_override = material
	var light := OmniLight3D.new()
	light.name = "BeaconLight"
	light.omni_range = 12.0
	light.light_color = BEACON_COLOR
	light.light_energy = 4.0
	beacon.add_child(light)
	return beacon