extends CharacterBody3D
## First-person player controller — M0.
##
## Move (WASD), look (mouse), jump (space). Gravity + ground collision via
## CharacterBody3D. Deliberately minimal: no stamina/health yet (M1), no network
## ownership yet (M2). Press ESC to free the mouse, click to recapture.

@export var speed: float = 5.0
@export var sprint_speed: float = 8.0
@export var jump_velocity: float = 5.5
@export var mouse_sensitivity: float = 0.0025

@onready var camera: Camera3D = $Camera3D

var _gravity: float = ProjectSettings.get_setting("physics/3d/default_gravity", 9.8)

func _ready() -> void:
	Input.mouse_mode = Input.MOUSE_MODE_CAPTURED

func _unhandled_input(event: InputEvent) -> void:
	if event is InputEventMouseMotion and Input.mouse_mode == Input.MOUSE_MODE_CAPTURED:
		rotate_y(-event.relative.x * mouse_sensitivity)
		camera.rotate_x(-event.relative.y * mouse_sensitivity)
		camera.rotation.x = clamp(camera.rotation.x, -1.4, 1.4)
	elif event is InputEventKey and event.pressed and event.keycode == KEY_ESCAPE:
		Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
	elif event is InputEventMouseButton and event.pressed:
		Input.mouse_mode = Input.MOUSE_MODE_CAPTURED

func _physics_process(delta: float) -> void:
	if not is_on_floor():
		velocity.y -= _gravity * delta

	if Input.is_action_just_pressed("jump") and is_on_floor():
		velocity.y = jump_velocity

	var input_dir := Input.get_vector("move_left", "move_right", "move_forward", "move_back")
	var direction := (transform.basis * Vector3(input_dir.x, 0, input_dir.y)).normalized()

	var current_speed := sprint_speed if Input.is_key_pressed(KEY_SHIFT) else speed
	if direction:
		velocity.x = direction.x * current_speed
		velocity.z = direction.z * current_speed
	else:
		velocity.x = move_toward(velocity.x, 0, current_speed)
		velocity.z = move_toward(velocity.z, 0, current_speed)

	move_and_slide()