use super::*;

#[test]
fn construct_polylines_positive0() {
    let lines = vec![
        (Point3::new(0.0, 0.0, 0.0), Point3::new(1.0, 0.0, 0.0)),
        (Point3::new(1.0, 0.0, 0.0), Point3::new(0.0, 1.0, 0.0)),
        (Point3::new(1.0, 1.0, 0.0), Point3::new(0.0, 0.0, 1.0)),
        (Point3::new(0.0, 1.0, 1.0), Point3::new(1.0, 1.0, 1.0)),
        (Point3::new(0.0, 0.0, 1.0), Point3::new(1.0, 0.0, 1.0)),
        (Point3::new(0.0, 1.0, 0.0), Point3::new(1.0, 1.0, 0.0)),
        (Point3::new(1.0, 1.0, 1.0), Point3::new(0.0, 0.0, 0.0)),
        (Point3::new(1.0, 0.0, 1.0), Point3::new(0.0, 1.0, 1.0)),
    ];
    let polyline = construct_polylines(&lines);
    assert_eq!(polyline.len(), 1);
    assert_eq!(polyline[0].len(), 9);

    let mut sign = None;
    for line in polyline[0].windows(2) {
        let a = line[0][0] + line[0][1] * 2.0 + line[0][2] * 4.0;
        let b = line[1][0] + line[1][1] * 2.0 + line[1][2] * 4.0;
        let x = b - a;
        assert!(f64::abs(x) == 1.0 || f64::abs(x) == 7.0);
        let s = f64::signum(x * (x - 2.0) * (x + 2.0));
        if let Some(sign) = sign {
            assert!(s == sign);
        } else {
            sign = Some(s);
        }
    }
}

#[test]
fn construct_polylines_positive1() {
    let lines = vec![
        (Point3::new(0.0, 0.0, 0.0), Point3::new(1.0, 0.0, 0.0)),
        (Point3::new(1.0, 0.0, 0.0), Point3::new(1.0, 1.0, 0.0)),
        (Point3::new(1.0, 0.0, 1.0), Point3::new(1.0, 1.0, 1.0)),
        (Point3::new(1.0, 1.0, 1.0), Point3::new(0.0, 1.0, 1.0)),
        (Point3::new(1.0, 1.0, 0.0), Point3::new(0.0, 1.0, 0.0)),
        (Point3::new(0.0, 1.0, 0.0), Point3::new(0.0, 0.0, 0.0)),
        (Point3::new(0.0, 0.0, 1.0), Point3::new(1.0, 0.0, 1.0)),
        (Point3::new(0.0, 1.0, 1.0), Point3::new(0.0, 0.0, 1.0)),
    ];
    let polyline = construct_polylines(&lines);
    assert_eq!(polyline.len(), 2);
    assert_eq!(polyline[0].len(), 5);
    assert_eq!(polyline[1].len(), 5);
}

#[test]
fn construct_polylines_positive2() {
    let lines = vec![
        (Point3::new(0.0, 0.0, 0.0), Point3::new(1.0, 0.0, 0.0)),
        (Point3::new(1.0, 0.0, 0.0), Point3::new(0.0, 1.0, 0.0)),
        (Point3::new(1.0, 1.0, 0.0), Point3::new(0.0, 0.0, 1.0)),
        (Point3::new(0.0, 1.0, 1.0), Point3::new(1.0, 1.0, 1.0)),
        (Point3::new(0.0, 0.0, 1.0), Point3::new(1.0, 0.0, 1.0)),
        (Point3::new(1.0, 1.0, 0.0), Point3::new(1.0, 1.0, 0.0)),
        (Point3::new(0.0, 1.0, 0.0), Point3::new(1.0, 1.0, 0.0)),
        (Point3::new(1.0, 1.0, 1.0), Point3::new(0.0, 0.0, 0.0)),
        (Point3::new(1.0, 0.0, 1.0), Point3::new(0.0, 1.0, 1.0)),
    ];
    let polyline = construct_polylines(&lines);
    assert_eq!(polyline.len(), 1);
    assert_eq!(polyline[0].len(), 9);

    let mut sign = None;
    for line in polyline[0].windows(2) {
        let a = line[0][0] + line[0][1] * 2.0 + line[0][2] * 4.0;
        let b = line[1][0] + line[1][1] * 2.0 + line[1][2] * 4.0;
        let x = b - a;
        assert!(f64::abs(x) == 1.0 || f64::abs(x) == 7.0);
        let s = f64::signum(x * (x - 2.0) * (x + 2.0));
        if let Some(sign) = sign {
            assert!(s == sign);
        } else {
            sign = Some(s);
        }
    }
}

#[test]
fn construct_polylines_positive3() {
    let lines = vec![
        (Point3::new(0.0, 0.0, 0.0), Point3::new(1.0, 0.0, 0.0)),
        (Point3::new(1.0, 0.0, 0.0), Point3::new(0.0, 1.0, 0.0)),
        (Point3::new(1.0, 1.0, 0.0), Point3::new(0.0, 0.0, 1.0)),
        (Point3::new(0.0, 1.0, 1.0), Point3::new(1.0, 1.0, 1.0)),
        (Point3::new(0.0, 0.0, 1.0), Point3::new(1.0, 0.0, 1.0)),
        (Point3::new(1.0, 1.0, 0.0), Point3::new(1.0, 1.0, 0.0)),
        (Point3::new(0.0, 1.0, 0.0), Point3::new(1.0, 1.0, 0.0)),
        (Point3::new(1.0, 0.0, 1.0), Point3::new(0.0, 1.0, 1.0)),
    ];
    let polyline = construct_polylines(&lines);
    assert_eq!(polyline.len(), 1);
    assert_eq!(polyline[0].len(), 8);

    let mut sign = None;
    for line in polyline[0].windows(2) {
        let a = line[0][0] + line[0][1] * 2.0 + line[0][2] * 4.0;
        let b = line[1][0] + line[1][1] * 2.0 + line[1][2] * 4.0;
        let x = b - a;
        assert!(f64::abs(x) == 1.0);
        let s = f64::signum(x * (x - 2.0) * (x + 2.0));
        if let Some(sign) = sign {
            assert!(s == sign);
        } else {
            sign = Some(s);
        }
    }
}