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//! Vector with dimensions unknown at compile-time.

use std::slice::{Iter, IterMut};
use std::iter::{FromIterator, IntoIterator};
use std::iter::repeat;
use std::ops::{Add, Sub, Mul, Div, Neg, Index, IndexMut};
use std::mem;
use rand::{self, Rand};
use num::{Zero, One};
use traits::operations::{ApproxEq, Axpy, Mean};
use traits::geometry::{Dot, Norm};
use traits::structure::{Iterable, IterableMut, Indexable, Shape, BaseFloat, BaseNum, Cast};
#[cfg(feature="arbitrary")]
use quickcheck::{Arbitrary, Gen};

/// Heap allocated, dynamically sized vector.
#[derive(Eq, PartialEq, Debug, Clone)]
pub struct DVec<N> {
    /// Components of the vector. Contains as much elements as the vector dimension.
    pub at: Vec<N>
}

impl<N> DVec<N> {
    /// Creates an uninitialized vec.
    #[inline]
    pub unsafe fn new_uninitialized(dim: usize) -> DVec<N> {
        let mut vec = Vec::with_capacity(dim);
        vec.set_len(dim);

        DVec {
            at: vec
        }
    }
}

impl<N: Clone> DVec<N> {
    /// Builds a vector filled with a constant.
    #[inline]
    pub fn from_elem(dim: usize, elem: N) -> DVec<N> {
        DVec { at: repeat(elem).take(dim).collect() }
    }

    /// Builds a vector filled with the components provided by a vector.
    ///
    /// The vector must have at least `dim` elements.
    #[inline]
    pub fn from_slice(dim: usize, vec: &[N]) -> DVec<N> {
        assert!(dim <= vec.len());

        DVec {
            at: vec[.. dim].to_vec()
        }
    }
}

impl<N> DVec<N> {
    /// Builds a vector filled with the results of a function applied to each of its component coordinates.
    #[inline(always)]
    pub fn from_fn<F: FnMut(usize) -> N>(dim: usize, mut f: F) -> DVec<N> {
        DVec { at: (0..dim).map(|i| f(i)).collect() }
    }

    /// The vector length.
    #[inline]
    pub fn len(&self) -> usize {
        self.at.len()
    }
}

impl<N> FromIterator<N> for DVec<N> {
    #[inline]
    fn from_iter<I: IntoIterator<Item = N>>(param: I) -> DVec<N> {
        DVec { at: param.into_iter().collect() }
    }
}

#[cfg(feature="arbitrary")]
impl<N: Arbitrary> Arbitrary for DVec<N> {
    fn arbitrary<G: Gen>(g: &mut G) -> DVec<N> {
        DVec { at: Arbitrary::arbitrary(g) }
    }
}


dvec_impl!(DVec);

/// Stack-allocated, dynamically sized vector with a maximum size of 1.
pub struct DVec1<N> {
    at:  [N; 1],
    dim: usize
}

small_dvec_impl!(DVec1, 1, 0);
small_dvec_from_impl!(DVec1, 1, ::zero());


/// Stack-allocated, dynamically sized vector with a maximum size of 2.
pub struct DVec2<N> {
    at:  [N; 2],
    dim: usize
}

small_dvec_impl!(DVec2, 2, 0, 1);
small_dvec_from_impl!(DVec2, 2, ::zero(), ::zero());


/// Stack-allocated, dynamically sized vector with a maximum size of 3.
pub struct DVec3<N> {
    at:  [N; 3],
    dim: usize
}

small_dvec_impl!(DVec3, 3, 0, 1, 2);
small_dvec_from_impl!(DVec3, 3, ::zero(), ::zero(), ::zero());


/// Stack-allocated, dynamically sized vector with a maximum size of 4.
pub struct DVec4<N> {
    at:  [N; 4],
    dim: usize
}

small_dvec_impl!(DVec4, 4, 0, 1, 2, 3);
small_dvec_from_impl!(DVec4, 4, ::zero(), ::zero(), ::zero(), ::zero());


/// Stack-allocated, dynamically sized vector with a maximum size of 5.
pub struct DVec5<N> {
    at:  [N; 5],
    dim: usize
}

small_dvec_impl!(DVec5, 5, 0, 1, 2, 3, 4);
small_dvec_from_impl!(DVec5, 5, ::zero(), ::zero(), ::zero(), ::zero(), ::zero());


/// Stack-allocated, dynamically sized vector with a maximum size of 6.
pub struct DVec6<N> {
    at:  [N; 6],
    dim: usize
}

small_dvec_impl!(DVec6, 6, 0, 1, 2, 3, 4, 5);
small_dvec_from_impl!(DVec6, 6, ::zero(), ::zero(), ::zero(), ::zero(), ::zero(), ::zero());