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use std::iter::FusedIterator;

use crate::{
	core::{Vector, VectorElement, VectorExtern},
	platform_types::size_t,
};

impl<T: VectorElement> IntoIterator for Vector<T> where Vector<T>: VectorExtern<T> {
	type Item = T;
	type IntoIter = VectorIterator<T>;

	#[inline]
	fn into_iter(self) -> VectorIterator<T> {
		Self::IntoIter::new(self)
	}
}

impl<'v, T: VectorElement> IntoIterator for &'v Vector<T> where Vector<T>: VectorExtern<T> {
	type Item = T;
	type IntoIter = VectorRefIterator<'v, T>;

	#[inline]
	fn into_iter(self) -> VectorRefIterator<'v, T> {
		self.iter()
	}
}

pub struct VectorIterator<T: VectorElement> where Vector<T>: VectorExtern<T> {
	vec: Vector<T>,
	i: size_t,
}

impl<T: VectorElement> VectorIterator<T> where Vector<T>: VectorExtern<T> {
	pub fn new(vec: Vector<T>) -> Self {
		Self { vec, i: 0 }
	}
}

impl<T: VectorElement> Iterator for VectorIterator<T> where Vector<T>: VectorExtern<T> {
	type Item = T;

	fn next(&mut self) -> Option<Self::Item> {
		let out = self.vec.get(self.i);
		self.i += 1;
		out.ok()
	}

	fn size_hint(&self) -> (usize, Option<usize>) {
		let len = self.vec.len() - self.i;
		(len, Some(len))
	}

	fn nth(&mut self, n: usize) -> Option<Self::Item> {
		self.vec.get(n).ok()
	}
}

impl<T: VectorElement> ExactSizeIterator for VectorIterator<T> where Vector<T>: VectorExtern<T> {}

impl<T: VectorElement> FusedIterator for VectorIterator<T> where Vector<T>: VectorExtern<T> {}

pub struct VectorRefIterator<'v, T: VectorElement> where Vector<T>: VectorExtern<T> {
	vec: &'v Vector<T>,
	i: size_t,
}

impl<'v, T: VectorElement> VectorRefIterator<'v, T> where Vector<T>: VectorExtern<T> {
	pub fn new(vec: &'v Vector<T>) -> Self {
		Self { vec, i: 0 }
	}
}

impl<T: VectorElement> Iterator for VectorRefIterator<'_, T> where Vector<T>: VectorExtern<T> {
	type Item = T;

	fn next(&mut self) -> Option<Self::Item> {
		let out = self.vec.get(self.i);
		self.i += 1;
		out.ok()
	}

	fn size_hint(&self) -> (usize, Option<usize>) {
		let len = self.vec.len() - self.i;
		(len, Some(len))
	}

	fn nth(&mut self, n: usize) -> Option<Self::Item> {
		self.vec.get(n).ok()
	}
}

impl<T: VectorElement> ExactSizeIterator for VectorRefIterator<'_, T> where Vector<T>: VectorExtern<T> {}

impl<T: VectorElement> FusedIterator for VectorRefIterator<'_, T> where Vector<T>: VectorExtern<T> {}