extends CharacterBody3D
## First-person player controller.
##
## Move (WASD), look (mouse), jump (space), sprint (shift). Gravity + ground
## collision via CharacterBody3D. In deep water the player floats with their
## head above the surface and moves at swimming speed. 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 swim_speed: float = 2.6
@export var jump_velocity: float = 5.5
@export var mouse_sensitivity: float = 0.0025
## Set by world.gd from the terrain. Feet this far below the surface = swimming.
@export var water_level: float = -INF
const FLOAT_DEPTH := 1.3

@onready var camera: Camera3D = $Camera3D

signal selected_changed
signal inventory_requested(container: Node)   ## the HUD opens the inventory screen

const HOTBAR := 8
var inventory := Inventory.new(40)   ## slots 0-7 are the hotbar
var selected := 0
var ui_open := false                 ## set by the inventory screen; freezes look/move
var hands: Node3D
var survival: Node                   ## health / stamina / hunger / warmth (survival.gd)
var worn := ""                       ## item id of the cloak you're wearing ("" = none)
signal worn_changed

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

func _ready() -> void:
	if not get_parent().get("menu_mode"):   # title-screen backdrop: leave the cursor alone
		Input.mouse_mode = Input.MOUSE_MODE_CAPTURED
	hands = preload("res://scripts/player/hands.gd").new()
	hands.name = "Hands"
	hands.player = self
	camera.add_child(hands)
	survival = preload("res://scripts/player/survival.gd").new()
	survival.name = "Survival"
	survival.player = self
	survival.world = get_parent()
	add_child(survival)

func held_item_id() -> String:
	var s = inventory.get_slot(selected)
	return s.id if s != null else ""

func select(i: int) -> void:
	selected = wrapi(i, 0, HOTBAR)
	selected_changed.emit()

## Called by workbenches and chests (container = null for plain crafting).
func open_inventory(container: Node) -> void:
	inventory_requested.emit(container)

func _unhandled_input(event: InputEvent) -> void:
	if ui_open:
		return
	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 InputEventMouseButton and event.pressed:
		# Recapture after the window lost focus (ESC now opens the pause menu).
		Input.mouse_mode = Input.MOUSE_MODE_CAPTURED

func _physics_process(delta: float) -> void:
	var float_y := water_level - FLOAT_DEPTH
	var swimming := global_position.y < float_y + 0.05 and not is_on_floor()

	if global_position.y < float_y:
		# Buoyancy: ease back up to floating height.
		velocity.y = move_toward(velocity.y, clampf((float_y - global_position.y) * 4.0, -3.0, 3.0), 20.0 * delta)
	elif not is_on_floor():
		velocity.y -= _gravity * delta

	if global_position.y < water_level - 0.6:
		survival.soak()   # waist-deep or more: you're wet

	var jump := Input.is_action_just_pressed("jump") and not ui_open
	var can_swim_jump := global_position.y > float_y - 0.4 and global_position.y < float_y + 0.3
	if jump and (is_on_floor() or can_swim_jump) and survival.use_stamina(8.0):
		# (A swim-jump kicks you up out of the water onto a bank.)
		velocity.y = jump_velocity

	var input_dir := Vector2.ZERO if ui_open else 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 sprinting: bool = Input.is_key_pressed(KEY_SHIFT) and direction.length() > 0.1 and not ui_open \
		and survival.use_stamina(14.0 * delta, true)
	var current_speed := sprint_speed if sprinting else speed
	if swimming:
		current_speed = swim_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()