use subject_source::vec::compute::*;

#[test]
pub fn compute_empty() {
    assert_eq!(compute(&[]), Err(ComputeError::NotEnoughData));
}

#[test]
pub fn compute_too_many_ops() {
    assert_eq!(
        compute(&[Operation::Push(1.0), Operation::Binary(Binary::Add)]),
        Err(ComputeError::NotEnoughData)
    );
}

#[test]
pub fn compute_division_by_zero_push() {
    assert_eq!(
        compute(&[
            Operation::Push(1.0),
            Operation::Push(0.0),
            Operation::Binary(Binary::Div)
        ]),
        Err(ComputeError::DivisionByZero)
    );
}

#[test]
pub fn compute_division_by_zero_operation() {
    assert_eq!(
        compute(&[
            Operation::Push(1.0),
            Operation::Push(1.0),
            Operation::Push(1.0),
            Operation::Binary(Binary::Sub),
            Operation::Binary(Binary::Div)
        ]),
        Err(ComputeError::DivisionByZero)
    );
}

#[test]
pub fn compute_all_ops() {
    assert_eq!(
        compute(&[
            Operation::Push(1.0),
            Operation::Push(3.0),
            Operation::Push(2.0),
            Operation::Binary(Binary::Sub),
            Operation::Push(5.0),
            Operation::Binary(Binary::Mul),
            Operation::Binary(Binary::Add),
            Operation::Push(2.0),
            Operation::Binary(Binary::Div),
        ]),
        Ok(3.0),
    );
}

#[test]
pub fn compute_add() {
    assert_eq!(compute(&[Operation::Push(1.0), Operation::Push(2.0), Operation::Binary(Binary::Add)]), Ok(3.0));
}

#[test]
pub fn compute_sub() {
    assert_eq!(compute(&[Operation::Push(1.0), Operation::Push(2.0), Operation::Binary(Binary::Sub)]), Ok(-1.0));
}

#[test]
pub fn compute_mul() {
    assert_eq!(compute(&[Operation::Push(3.0), Operation::Push(2.0), Operation::Binary(Binary::Mul)]), Ok(6.0));
}

#[test]
pub fn compute_div() {
    assert_eq!(compute(&[Operation::Push(42.0), Operation::Push(7.0), Operation::Binary(Binary::Div)]), Ok(6.0));
}