//! Implements rng using the xoshiro256++ algorithm

use rand::rand_core::{RngCore, SeedableRng};
use rand_xoshiro::Xoshiro256PlusPlus;

/// Deterministic pseudo random number generator.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct DungeonRng(Xoshiro256PlusPlus);
impl SeedableRng for DungeonRng {
	// Fix to 256 bits. Changing this is a breaking change!
	type Seed = <Xoshiro256PlusPlus as SeedableRng>::Seed;

	#[inline]
	fn from_seed(seed: Self::Seed) -> Self {
		Self(Xoshiro256PlusPlus::from_seed(seed))
	}

	#[inline]
	fn seed_from_u64(state: u64) -> Self {
		Self(Xoshiro256PlusPlus::seed_from_u64(state))
	}
}
impl RngCore for DungeonRng {
	#[inline]
	fn next_u32(&mut self) -> u32 {
		self.0.next_u32()
	}

	#[inline]
	fn next_u64(&mut self) -> u64 {
		self.0.next_u64()
	}

	#[inline]
	fn fill_bytes(&mut self, dst: &mut [u8]) {
		self.0.fill_bytes(dst);
	}
}