class_name Player extends CharacterBody3D

const FOCUS_SPEED := 30.0
const RUN_SPEED := 80.0
const SPRINT_SPEED := 160.0
const AIR_SPEED := 10.0

const JUMP_FORCE := 4.5

const GROUND_FRICTION := 0.3
const AIR_FRICTION := 0.03

@export var inventory: Dictionary[Item, int] = {}

var gravity: Vector3 = (
	ProjectSettings.get_setting("physics/3d/default_gravity")
	* ProjectSettings.get_setting("physics/3d/default_gravity_vector")
)

var selected_interactive: Interactive
var firing := false

@onready var hud: PlayerHUD = %PlayerHUD

@onready var camera_pivot: CameraController = %CameraPivot

@onready var interact_ray: RayCast3D = %InteractRay

@onready var tool_mount: ToolMount = %ToolMount
@onready var point_spray: PointSpray = %PointSpray
@onready var wide_spray: WideSpray = %WideSpray
@onready var toothbrush: Tool = %Toothbrush

## Global static access to player singleton
static var instance: Player


func _ready() -> void:
	instance = self


func get_speed() -> float:
	if is_on_floor():
		if firing:
			return FOCUS_SPEED
		if Input.is_action_pressed("sprint"):
			return SPRINT_SPEED
		return RUN_SPEED
	return AIR_SPEED


func get_friction() -> float:
	if is_on_floor():
		return GROUND_FRICTION
	return AIR_FRICTION


func get_tool() -> Tool:
	return tool_mount.get_active()


## Add the given item to the player's inventory.
func add_item(item: Item, amount: int = 1) -> void:
	inventory[item] = inventory.get(item, 0) + amount


## Remove the given item from the player's inventory.
func remove_item(item: Item, amount: int = 1) -> void:
	inventory[item] = inventory.get(item, 0) - amount
	if inventory[item] <= 0:
		inventory.erase(item)


func _physics_process(delta: float) -> void:
	# Will be null if no valid interactor is selected.
	var interactive: Interactive = interact_ray.get_collider() as Interactive
	hud.select_interactive(interactive)
	if interactive:
		interactive.select()

	# World interaction
	if interactive and Input.is_action_just_pressed("interact"):
		interactive.activate()

	# Tool selection
	if Input.is_action_just_pressed("select_next_tool"):
		tool_mount.set_active_relative(1)
	elif Input.is_action_just_pressed("select_prev_tool"):
		tool_mount.set_active_relative(-1)
	elif Input.is_action_just_pressed("select_point_spray"):
		tool_mount.set_active(point_spray)
	elif Input.is_action_just_pressed("select_wide_spray"):
		tool_mount.set_active(wide_spray)
	elif Input.is_action_just_pressed("select_brush"):
		tool_mount.set_active(toothbrush)

	# Tool use
	if Input.is_action_pressed("fire"):
		get_tool().fire()
		firing = true
	else:
		get_tool().idle()
		firing = false

	if Input.is_action_just_pressed("switch_mode"):
		get_tool().switch_mode()

	# Gravity
	if not is_on_floor():
		velocity += gravity * delta

	# Input movement
	var input_dir := Input.get_vector("move_left", "move_right", "move_forward", "move_back")
	var rel_input := input_dir.rotated(-camera_pivot.global_rotation.y)
	var direction := Vector3(rel_input.x, 0, rel_input.y).normalized()
	var movement := direction * get_speed() * delta
	velocity.x += movement.x
	velocity.z += movement.z
	if Input.is_action_just_pressed("jump") and is_on_floor():
		velocity.y = JUMP_FORCE

	# Friction
	var friction := get_friction()
	velocity.x = lerpf(velocity.x, 0, friction)
	velocity.z = lerpf(velocity.z, 0, friction)

	move_and_slide()