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extends Camera

# tested in Godot 3.1
export var normal_flyspeed = 5
export var shift_flyspeed = 15
var flyspeed = normal_flyspeed
var tmp_flyspeed
var view_sensitivity = 0.3
var mousedifference = Vector3()
var yaw = 0
var pitch = 0


func _ready():
	self.set_process_input(true)
	self.set_process(true)

func _enter_tree():
	Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED)

func _exit_tree():
	Input.set_mouse_mode(Input.MOUSE_MODE_VISIBLE)

func _input(event):
	if event is InputEventMouseMotion:
		yaw = fmod(yaw - event.relative.x * view_sensitivity , 360)
		pitch = max(min(pitch - event.relative.y * view_sensitivity, 90), -90)
		self.set_rotation(Vector3(deg2rad(pitch), deg2rad(yaw), 0))

func _process(delta):
	
	# Fly faster if shift is pressed:
	if(Input.is_key_pressed(KEY_SHIFT)):
		flyspeed = shift_flyspeed
	else:
		flyspeed = normal_flyspeed
	
	# WASD = move on horizontal plane
	if(Input.is_key_pressed(KEY_W)):
		self.set_translation(self.get_translation() - get_global_transform().basis*Vector3(0,0,1) * flyspeed * .01)
	if(Input.is_key_pressed(KEY_S)):
		self.set_translation(self.get_translation() - get_global_transform().basis*Vector3(0,0,1) * flyspeed * -.01)
	if(Input.is_key_pressed(KEY_A)):
		self.set_translation(self.get_translation() - get_global_transform().basis*Vector3(1,0,0) * flyspeed * .01)
	if(Input.is_key_pressed(KEY_D)):
		self.set_translation(self.get_translation() - get_global_transform().basis*Vector3(1,0,0) * flyspeed * -.01)
	# E/R move upward, Q/F move downwards
	if(Input.is_key_pressed(KEY_E) or Input.is_key_pressed(KEY_R)):
		self.set_translation(self.get_translation() - get_global_transform().basis*Vector3(0,1,0) * flyspeed * -.01)
	if(Input.is_key_pressed(KEY_Q) or Input.is_key_pressed(KEY_F)):
		self.set_translation(self.get_translation() - get_global_transform().basis*Vector3(0,1,0) * flyspeed * .01)