use frustum::*;
use pretty_assertions::assert_eq;

fn default_camera() -> Frustum {
    Frustum {
        origin: Point3::<WorldSpace>::new(0.0, 0.0, 10.0),
        target: Point3::<WorldSpace>::new(0.0, 0.0, 0.0),
        fovy: 45.0,
        ncp: 1.0,
        fcp: 20.0,
        width: 500,
        height: 500,
    }
}

#[test]
fn test_view() {
    assert_eq!(
        default_camera().view(),
        Transform3::row_major(
            -1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, -1.0, 0.0, -0.0,
            -0.0, 10.0, 1.0
        )
    )
}

#[test]
fn test_projection() {
    assert_eq!(
        default_camera().projection(),
        Transform3::row_major(
            2.414213562373095,
            0.0,
            0.0,
            0.0,
            0.0,
            -2.414213562373095,
            0.0,
            0.0,
            0.0,
            0.0,
            1.0526315789473684,
            1.0,
            0.0,
            0.0,
            -1.0526315789473684,
            0.0
        )
    )
}

#[test]
fn test_screen() {
    assert_eq!(
        default_camera().screen(),
        Transform3::column_major(
            250.0, 0.0, 0.0, 250.0, 0.0, 250.0, 0.0, 250.0, 0.0, 0.0, 1.0, 0.0,
            0.0, 0.0, 0.0, 1.0
        )
    )
}

#[test]
fn test_proj_view() {
    let camera = default_camera();
    let view = camera.view();
    let projection = camera.projection();

    assert_eq!(
        view.post_transform(&projection),
        Transform3::row_major(
            -2.414213562373095,
            0.0,
            0.0,
            0.0,
            0.0,
            -2.414213562373095,
            0.0,
            0.0,
            0.0,
            0.0,
            -1.0526315789473684,
            -1.0,
            0.0,
            0.0,
            9.473684210526315,
            10.0
        )
    )
}

#[test]
fn test_screen_proj_view() {
    let camera = default_camera();
    let view = camera.view();
    let projection = camera.projection();
    let screen = camera.screen();

    assert_eq!(
        view.post_transform(&projection)
            .post_transform(&screen)
            .transform_point3d(Point3::new(0.0, 0.0, -11.0)),
        Some(Point3::new(250.0, 250.0, 1.0025062656641603))
    );
    assert_eq!(
        view.post_transform(&projection)
            .post_transform(&screen)
            .transform_point3d(Point3::new(0.0, 0.0, 9.0)),
        Some(Point3::new(250.0, 250.0, 0.0))
    );
}

// #[test]
// fn test_frustum_path() {
//     let frustum_path = FrustumPath {
//         key_frames: vec![Frustum {
//             origin: Point3::<WorldSpace>::new(0.0, 0.0, 10.0),
//             target: Point3::<WorldSpace>::new(0.0, 0.0, 0.0),
//             fovy: 45.0,
//             ncp: 1.0,
//             fcp: 20.0,
//             width: 500,
//             height: 500,
//         }],
//         frames_per_unit: 24,
//     };

//     for frustum in frustum_path.iter() {
//         println!("{:?}", frustum);
//     }
//     assert_eq!(false, true);
// }