/*
    Appellation: tensor <test>
    Contrib: FL03 <jo3mccain@icloud.com>
*/
#![cfg(test)]
extern crate acme_tensor as acme;

use acme::prelude::{IntoShape, Tensor};

#[test]
fn test_tensor() {
    let shape = (2, 2);
    let a = Tensor::<f64>::ones(shape);
    let b = a.zeros_like();

    assert_ne!(a.id(), b.id());
    assert_eq!(a.shape(), b.shape());
    assert_eq!(a.size(), b.size());
    assert_eq!(a.strides(), b.strides());
}

#[test]
#[ignore = "reason"]
fn test_raw_tensor() {
    let shape = (2, 2).into_shape();
    let stride = shape.default_strides();
    let mut data = vec![1f64, 2f64, 3f64, 4f64];
    let exp = Tensor::<f64>::from_shape_vec(shape.clone(), data.clone());

    unsafe {
        let ptr = data.as_mut_ptr();
        let a = Tensor::<f64>::from_raw_parts(ptr, shape, stride);
        assert_eq!(a, exp);
    }
}

#[test]
fn test_scalar_tensor() {
    use num::{One, Zero};
    let one = Tensor::<f64>::one();
    let zero = Tensor::<f64>::zero();
    assert!(one.is_scalar());
    assert!(zero.is_scalar());
}

#[test]
fn test_first_and_last() {
    let shape = (3, 3);
    let tensor = Tensor::linspace(0f64, 9f64, 9).reshape(shape).unwrap();

    assert_eq!(tensor.first(), Some(&0f64));
    assert_eq!(tensor.last(), Some(&8f64));

    let shape = (3, 3, 1);
    let tensor = Tensor::linspace(0f64, 9f64, 9).reshape(shape).unwrap();

    assert_eq!(tensor.first(), Some(&0f64));
    assert_eq!(tensor.last(), Some(&8f64));
}

#[test]
fn test_index() {
    let shape = (2, 3).into_shape();
    let n = shape.size();
    let a = Tensor::<f64>::linspace(0f64, n as f64, n)
        .reshape(shape.clone())
        .unwrap();

    assert_eq!(a[[0, 0]], 0f64);
    assert_eq!(a[&[0, 1]], 1f64);
    assert_eq!(a[shape.get_final_position()], 5f64);
}

#[test]
fn test_higher_dim() {
    let shape = (2, 2, 2, 2);
    let a = Tensor::<f64>::ones(shape);
    let b = a.zeros_like();

    assert_ne!(a.id(), b.id());
    assert_eq!(a.shape(), b.shape());
    assert_eq!(a.size(), b.size());
    assert_eq!(a.strides(), b.strides());
    assert_eq!(a.strides().len(), 4);
}

#[test]
fn test_sum() {
    let shape = (2, 2).into_shape();
    let a = Tensor::fill(shape, 1f64);
    assert_eq!(a.sum(), 4.0);
}

#[test]
fn test_product() {
    let shape = (2, 2).into_shape();
    let a = Tensor::fill(shape, 2f64);
    assert_eq!(a.product(), 16.0);
}