class_name PlayerController extends RigidBody3D

@export var enabled: bool = false:
	set(value):
		if enabled == value: return
		enabled = value
		_apply_enabled_state()


func _apply_enabled_state() -> void:
	# Kill any existing jitter tween to prevent stacking
	if jitter_tween: jitter_tween.kill()

	if enabled:
		camera.make_current()
		get_viewport().gui_release_focus()
		Input.mouse_mode = Input.MOUSE_MODE_CAPTURED
		jitter_tween = create_tween()
		jitter_tween.tween_property(self, "jitter_strength", 1.0, 1.0)

		if has_entered:
			ui_exited.emit()
			
		# Show hand cursor when player is enabled
		if hand_cursor:
			hand_cursor.visible = true
	else:
		Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
		jitter_tween = create_tween()
		jitter_tween.tween_property(self, "jitter_strength", 0.0, 0.5)
		if has_entered:
			ui_exited.emit()
		# Hide hand cursor when player is disabled
		if hand_cursor:
			hand_cursor.visible = false
	sleeping = not enabled

@export var mouse_sensitivity: Vector2 = Vector2(6, 5)

@export var initial_pitch: float = 50

@export_range (0.0, 10.0) var max_speed: float = 3
@export_range (0.0, 10.0) var max_acceleration: float = 5
@export_range (0.0, 20.0) var damp: float = 10
@export_range (0.1, 1.0) var mouse_jerk:float = 0.5
@export_range (10.0, 100.0) var gamepad_response:float = 50.0
@export_range (50.0, 500.0) var mouse_jerk_rejection:float = 200.0
@export var max_angle:float = 75.0

@export var camera_jitter_speed:float = 3
@export var angular_jitter:Vector3 = Vector3(0.1, 0, 0.05)
@export var angular_jitter_speed:Vector3 = Vector3(2, 1, 1)
@export var location_jitter:Vector3 = Vector3(0.05, 0.05, 0.05)
@export var location_jitter_speed:Vector3 = Vector3(2, 0.3, 1)

var jitter_strength: float = 0
var jitter_tween: Tween = null

var loc_noise_spot: Vector3 = Vector3.ZERO
var rot_noise_spot: Vector3 = Vector3.ZERO

var rotation_speed: Vector2 = Vector2.ZERO
var current_mouse_rotation: Vector2 = Vector2.ZERO

var noise: Noise = FastNoiseLite.new()
var crouched:bool = false:
	set(set_crouching):
		if !is_node_ready(): return
		if set_crouching and not crouched:
			if State.reduce_motion:
				$PlayerAnimationPlayer.play("reduced_crouch")
			elif trigger_slow_crouch:
				$PlayerAnimationPlayer.play("crouch")
				trigger_slow_crouch = false
			else:
				$PlayerAnimationPlayer.play("fast_crouch")
			crouched = set_crouching
		elif (not set_crouching and crouched) and not crouch_held:
			if can_stand_up():
				if State.reduce_motion:
					$PlayerAnimationPlayer.play("reduced_stand_up")
				elif trigger_slow_crouch:
					$PlayerAnimationPlayer.play("stand_up")
					trigger_slow_crouch = false
				else:
					$PlayerAnimationPlayer.play("fast_stand_up")
				crouched = set_crouching

@onready var yaw: Node3D = $Yaw
@onready var pitch: Node3D = $Yaw/Pitch
@onready var mount: Node3D = $Yaw/Pitch/Mount
@onready var camera: Camera3D = $Yaw/Pitch/Mount/Camera3D
@onready var focus_ray: RayCast3D = $Yaw/Pitch/Mount/Camera3D/RayCast3D
@onready var ui_prober: Area3D = $Yaw/Pitch/Mount/Camera3D/UiProber
@onready var hand_cursor: TextureRect = %Cursor

# Cursor textures (preloaded for performance)
const cursor_default: Texture2D = preload("res://import/interface-elements/cursor_point.png")
const cursor_point: Texture2D = preload("res://import/interface-elements/cursor_grab.png")

@onready var base_fov := camera.fov
var zoomed:bool = false:
	set(zoom):
		if zoomed != zoom:
			if zoom:
				var zoom_tween := create_tween()
				zoom_tween.tween_property(camera, "fov", base_fov*0.5, 0.5)
			else:
				var zoom_tween := create_tween()
				zoom_tween.tween_property(camera, "fov", base_fov, 0.5)
		zoomed = zoom
signal ui_entered
signal ui_exited

func _ready():
	State.player = self
	State.player_view = %Camera3D

	# Connect to central player enable signal.
	Scenes.player_enable.connect(_on_player_enable)

	_handle_jitter(0)

	pitch.rotation_degrees.x = initial_pitch

	ui_prober.area_entered.connect(_on_ray_entered)
	ui_prober.area_exited.connect(_on_ray_exited)

	$CrouchDetector.area_entered.connect(enter_crouch)
	$CrouchDetector.area_exited.connect(exit_crouch)

	# Setup hand cursor
	_setup_hand_cursor()

	# Apply exported enabled state now that nodes are ready
	_apply_enabled_state()


func _on_player_enable(enable: bool) -> void:
	enabled = enable

## Setup the hand cursor in the center of the screen
func _setup_hand_cursor() -> void:
	# Configure the existing TextureRect for cursor display
	hand_cursor.texture = cursor_default  # Start with default cursor
	hand_cursor.visible = false

## Restores player position and camera rotation from save game
func restore_from_save(save: SaveGame) -> void:
	if save.player_position != Vector3.ZERO:
		global_position = save.player_position
	if save.player_yaw != 0:
		yaw.rotation.y = save.player_yaw
	if save.player_pitch != 0:
		pitch.rotation.x = save.player_pitch

func _process(_delta) -> void:
	if not enabled:
		return

	if not has_entered:
		camera.fov = base_fov / (1 + Input.get_action_raw_strength("zoom_in_controller"))

var has_entered:bool = false:
	set(val):
		if val != has_entered:
			if val:
				ui_entered.emit()
			else:
				ui_exited.emit()
		has_entered = val
		if not has_entered:
			delay_passed = false
var delay_passed:bool = false

func _on_ray_entered(_area : Area3D) -> void:
	var parent := _area.get_parent() as Interactable
	if not parent.visible: return
	assert(parent != null, "Ray entered non-interactable area!")
	#printt("ray entered", parent.name, parent)
	parent.hover = true
	# Switch to pointing hand cursor when hovering over interactable
	if hand_cursor:
		hand_cursor.texture = cursor_point

func _on_ray_exited(_area : Area3D) -> void:
	var parent := _area.get_parent() as Interactable
	if not parent.visible: return
	#printt("ray exited", parent.name, parent)
	parent.hover = false
	# Switch back to default cursor when not hovering
	if hand_cursor:
		hand_cursor.texture = cursor_default


func _physics_process(delta: float):
	if enabled:
		_handle_movement(delta)
		_handle_rotation(delta)
	if jitter_strength > 0 and not State.reduce_motion:
		_handle_jitter(delta)

func _handle_movement(_delta:float):
	var input:Vector2 = Vector2(Input.get_action_strength("player_right") - Input.get_action_strength("player_left"),
						Input.get_action_strength("player_backwards")*0.8 - Input.get_action_strength("player_forwards"))

	if input.length()>1:
		input = input.normalized()

	var direction: Vector3 = Vector3(input.x, 0, input.y)

	direction = yaw.global_transform.basis.x * direction.x + transform.basis.y * direction.y + yaw.global_transform.basis.z * direction.z

	linear_damp = damp * max(0.5, 1 - input.length())

	apply_central_force(direction*max_acceleration)

func _handle_rotation(delta:float):
	var smoothness = min(3, 60.0/Engine.get_frames_per_second())

	var input_speed := Vector2( Input.get_action_strength("look_right")-Input.get_action_strength("look_left"), Input.get_action_strength("look_up")-Input.get_action_strength("look_down")) * gamepad_response

	# secretly, inverted y axis is the default
	if not State.inverty_y_axis: input_speed *= Vector2(1, -1)

	if current_mouse_rotation.length()>0:
		input_speed = current_mouse_rotation
		current_mouse_rotation = Vector2.ZERO

	rotation_speed = rotation_speed * (1-mouse_jerk*smoothness) + input_speed * mouse_jerk * smoothness

	if rotation_speed.y > 0 and pitch.rotation_degrees.x < 0:
		rotation_speed.y *= 1-pow(pitch.rotation_degrees.x/-max_angle, 4)
	elif rotation_speed.y < 0 and pitch.rotation_degrees.x > 0 :
		rotation_speed.y *= 1-pow(pitch.rotation_degrees.x/max_angle, 4)


	yaw.rotate_y(deg_to_rad(-rotation_speed.x * delta * mouse_sensitivity.x * State.input_sensitivity))
	pitch.rotate_x(deg_to_rad(-rotation_speed.y * delta * mouse_sensitivity.y * State.input_sensitivity))

func _handle_jitter(delta):
	loc_noise_spot += Vector3(delta * camera_jitter_speed * location_jitter_speed)
	rot_noise_spot += Vector3(delta * camera_jitter_speed * angular_jitter_speed)
	pitch.position = Vector3(
						noise.get_noise_1d(loc_noise_spot.x),
						noise.get_noise_1d(loc_noise_spot.y),
						noise.get_noise_1d(loc_noise_spot.z)
						) * location_jitter * jitter_strength

	if not State.reduce_motion: mount.rotation = Vector3(
						noise.get_noise_1d(rot_noise_spot.x),
						noise.get_noise_1d(rot_noise_spot.y),
						noise.get_noise_1d(rot_noise_spot.z)
						) * angular_jitter * jitter_strength


func _handle_mouse_input(event:InputEventMouseMotion):
	if event.relative.length() < mouse_jerk_rejection:
		current_mouse_rotation = event.relative

# Variables to keep track of crouch state.
var trigger_slow_crouch: bool = false
var crouch_held: bool = false
var crouch_toggled: bool = false
var crouch_start_time: float = 0

func _input(event: InputEvent) -> void:
	if not enabled:
		return

	if event is InputEventMouseMotion and Input.mouse_mode == Input.MOUSE_MODE_CAPTURED:
		_handle_mouse_input(event)
		get_viewport().set_input_as_handled()

	if event is InputEventMouseButton and event.pressed:
		if Input.is_action_just_pressed("zoom_in_mouse"):
			zoomed = true
		elif Input.is_action_just_pressed("zoom_out_mouse"):
			zoomed = false

	if event.is_action_pressed("collect_memento_ui") or event.is_action_pressed("option_memento_ui"):
		if focus_ray.is_colliding():
			var collider := focus_ray.get_collider()
			if collider is InteractiveSprite:
				collider.handle(event)
				get_viewport().set_input_as_handled()

	if event.is_action_pressed("crouch"):
		crouch_start_time = Time.get_unix_time_from_system()
		if crouch_toggled:
			crouch_start_time = 0
		else:
			crouch_held = true
			crouched = true
	elif event.is_action_released("crouch"):
		crouch_held = false
		if Time.get_unix_time_from_system() > crouch_start_time + 0.5:
			if crouched and can_stand_up():
				crouch_toggled = false
				crouched = false
		else:
			crouch_toggled = true

func _on_bed_enter(_body):
	if not crouched:
		trigger_slow_crouch = true
		crouched = true

func _on_bed_exit(_body):
	if crouched and not crouch_held:
		trigger_slow_crouch = true
		crouched = false

var inside_crouch_volume: Array[CrouchVolume] = []

#returns true, if the player character can stand upright.
func can_stand_up() -> bool:
	for area: Area3D in $CrouchDetector.get_overlapping_areas():
		if area is CrouchVolume:
			return false
	return true

func enter_crouch(body):
	if body is CrouchVolume:
		crouched = true

func exit_crouch(body):
	if body is CrouchVolume:
		crouched = false