const U16_MAX: usize = u16::MAX as usize;

pub struct Count {
	tcp_tx: Box<[usize]>,
	tcp_rx: Box<[usize]>,
	udp_tx: Box<[usize]>,
	udp_rx: Box<[usize]>,
}

impl Count {
	pub fn new() -> Self {
		Self {
			tcp_tx: Box::new([0; U16_MAX]),
			tcp_rx: Box::new([0; U16_MAX]),
			udp_tx: Box::new([0; U16_MAX]),
			udp_rx: Box::new([0; U16_MAX]),
		}
	}

	pub fn push_tcp(&mut self, tx_flag: bool, src: u16, dst: u16, len: usize) {
		// The unsafe code here is bad and not good. As far as I am aware, this
		// is safe except for allowing race conditions.
		if tx_flag {
			let bad_mut = unsafe { &mut *(self.tcp_tx.as_ptr() as *mut [usize; U16_MAX]) };
			bad_mut[src as usize] += len;
		} else {
			let bad_mut = unsafe { &mut *(self.tcp_rx.as_ptr() as *mut [usize; U16_MAX]) };
			bad_mut[dst as usize] += len;
		}
	}

	pub fn push_udp(&mut self, tx_flag: bool, src: u16, dst: u16, len: usize) {
		// The unsafe code here is bad and not good. As far as I am aware, this
		// is safe except for allowing race conditions.
		if tx_flag {
			let bad_mut = unsafe { &mut *(self.udp_tx.as_ptr() as *mut [usize; U16_MAX]) };
			bad_mut[src as usize] += len;
		} else {
			let bad_mut = unsafe { &mut *(self.udp_rx.as_ptr() as *mut [usize; U16_MAX]) };
			bad_mut[dst as usize] += len;
		}
	}

	pub fn tcp_tx(&self, port: u16) -> usize {
		self.tcp_tx[port as usize]
	}

	pub fn tcp_rx(&self, port: u16) -> usize {
		self.tcp_rx[port as usize]
	}

	pub fn udp_tx(&self, port: u16) -> usize {
		self.udp_tx[port as usize]
	}

	pub fn udp_rx(&self, port: u16) -> usize {
		self.udp_rx[port as usize]
	}

	pub fn many_tcp_tx(&self, ports: &[u16]) -> usize {
		ports.iter().fold(0, |acc, port| acc + self.tcp_tx[*port as usize])
	}

	pub fn many_tcp_rx(&self, ports: &[u16]) -> usize {
		ports.iter().fold(0, |acc, port| acc + self.tcp_rx[*port as usize])
	}
}