extends CharacterBody3D
class_name OverworldEntity

const PauseSystem = preload("res://scripts/System/PauseSystem.gd")

enum Direction {
	NORTH,
	SOUTH,
	WEST,
	EAST
}

var speed:float = 150;
var friction:float = 8.5;
var gravity:float = 30;

var direction = Direction.SOUTH;
var meshInstance:MeshInstance3D;
var underFootTile:int = -1;
var underFootPosition:Vector3;

var withinMapBounds:MapBounds;
var withinBoundsLastFrame:bool = true;

func getSystems() -> Systems:
	return get_tree().current_scene.get_node("Systems") as Systems;

func getDirectionVector() -> Vector3:
	match direction:
		Direction.NORTH:
			return Vector3(0, 0, -1);
		Direction.SOUTH:
			return Vector3(0, 0, 1);
		Direction.WEST:
			return Vector3(-1, 0, 0);
		Direction.EAST:
			return Vector3(1, 0, 0);
	return Vector3(0, 0, 0);
	
func getDirectionToFace(position:Vector3) -> Direction:
	var diff = position - self.position;
	if abs(diff.x) > abs(diff.z):
		if diff.x > 0:
			return Direction.EAST;
		else:
			return Direction.WEST;
	else:
		if diff.z > 0:
			return Direction.SOUTH;
		else:
			return Direction.NORTH;
	return Direction.SOUTH;

# Virtual Methods
func updateMovement(delta) -> void:
	pass
	
func updateOverworldLogic(delta) -> void:
	pass

func isPaused() -> bool:
	var pause = getSystems().PAUSE;
	var ps = pause.getPauseState();

	if ps == PauseSystem.PauseType.NOT_PAUSED:
		return false;
	elif ps == PauseSystem.PauseType.FULLY_PAUSED:
		return true;
	elif ps == PauseSystem.PauseType.ENTITY_PAUSED:
		if pause.entities.find(self) != -1:
			return true;
		return false
	elif ps == PauseSystem.PauseType.CUTSCENE_PAUSED:
		if pause.entities.find(self) != -1:
			return false;
		return true;
	return false;

# Private methods
func _updateTileData() -> void:
	# ray cast down
	var offset = Vector3(0, 0, 0.426);
	var query = PhysicsRayQueryParameters3D.create(
		position + offset,
		position + Vector3(0, -1, 0) + offset
	)
	query.collide_with_areas = true
	query.exclude = [self]

	var result = get_world_3d().direct_space_state.intersect_ray(query)
	if !result or !result.collider:
		return;

	var collider = result.collider;
	var colliderMesh = collider.get_node("../");
	if !colliderMesh or !(colliderMesh is ArrayMesh) or !colliderMesh.mesh or colliderMesh.mesh.get_surface_count() == 0:
		return;

	# Get the face index (triangle)
	var arrays = colliderMesh.mesh.surface_get_arrays(0);
	var indiceIdx = result.face_index * 3;
	
	# Get each indice of the triangle
	var index0 = arrays[Mesh.ARRAY_INDEX][indiceIdx+0];
	var index1 = arrays[Mesh.ARRAY_INDEX][indiceIdx+1];
	var index2 = arrays[Mesh.ARRAY_INDEX][indiceIdx+2];
	
	# Get each uv of each indice
	var uv0:Vector2 = arrays[Mesh.ARRAY_TEX_UV][index0];
	var uv1:Vector2 = arrays[Mesh.ARRAY_TEX_UV][index1];
	var uv2:Vector2 = arrays[Mesh.ARRAY_TEX_UV][index2];
	
	# Determine the lowest texture coordinate
	var min = Vector2(min(uv0.x, uv1.x, uv2.x), min(uv0.y, uv1.y, uv2.y));
	
	# Convert to column/row
	var w = 768;
	var h = w;
	var tw = 48;
	var th = tw;
	var column = int(roundf(min.x * w)) / 48;
	var row = int(roundf(min.y * h)) / 48;
	var columns = 768 / 48;
	underFootPosition = result.position;
	underFootTile = column % columns + row * columns;

# Events
func _ready() -> void:
	meshInstance = get_node("MeshInstance3D")
	_updateTileData();
	pass

func _process(delta:float) -> void:
	if isPaused():
		return;

	# Handle entity leaving map bounds
	if !withinMapBounds:
		if !withinBoundsLastFrame:
			print("Entity ", self.name, " was out of map bounds for two frames");
		withinBoundsLastFrame = false;
	else:
		withinBoundsLastFrame = true;
	
	# Update logic
	updateOverworldLogic(delta)
	
	# Set shader direction.
	var material:ShaderMaterial = meshInstance.get_surface_override_material(0)
	material.set_shader_parameter("direction", direction)

func _physics_process(delta: float) -> void:
	if isPaused():
		return;

	# Update movement
	updateMovement(delta);

	# Gravity and friction
	if !is_on_floor():
		velocity.y -= gravity * delta;
	else:
		velocity += -(velocity * friction * delta);
		if velocity.length() != 0:
			_updateTileData();
	
	# Update character controller.
	move_and_slide();