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#[derive(Debug)]
pub(crate) struct FontPreference {
    pub name: String,
    pub style: Option<String>,
    pub pt_size: f32,
}

impl Default for FontPreference {
    fn default() -> Self {
        Self {
            name: "sans-serif".into(),
            style: None,
            pt_size: 10.0,
        }
    }
}

impl FontPreference {
    /// Parse config string like `Cantarell 12`, `Cantarell Bold 11`, `Noto Serif CJK HK Bold 12`.
    pub fn from_name_style_size(conf: &str) -> Option<Self> {
        // assume last is size, 2nd last is style and the rest is name.
        match conf.rsplit_once(' ') {
            Some((head, tail)) if tail.chars().all(|c| c.is_numeric()) => {
                let pt_size: f32 = tail.parse().unwrap_or(10.0);
                match head.rsplit_once(' ') {
                    Some((name, style)) if !name.is_empty() => Some(Self {
                        name: name.into(),
                        style: Some(style.into()),
                        pt_size,
                    }),
                    None if !head.is_empty() => Some(Self {
                        name: head.into(),
                        style: None,
                        pt_size,
                    }),
                    _ => None,
                }
            }
            Some((head, tail)) if !head.is_empty() => Some(Self {
                name: head.into(),
                style: Some(tail.into()),
                pt_size: 10.0,
            }),
            None if !conf.is_empty() => Some(Self {
                name: conf.into(),
                style: None,
                pt_size: 10.0,
            }),
            _ => None,
        }
    }
}

#[test]
fn pref_from_multi_name_variant_size() {
    let pref = FontPreference::from_name_style_size("Noto Serif CJK HK Bold 12").unwrap();
    assert_eq!(pref.name, "Noto Serif CJK HK");
    assert_eq!(pref.style, Some("Bold".into()));
    assert!((pref.pt_size - 12.0).abs() < f32::EPSILON);
}

#[test]
fn pref_from_name_variant_size() {
    let pref = FontPreference::from_name_style_size("Cantarell Bold 12").unwrap();
    assert_eq!(pref.name, "Cantarell");
    assert_eq!(pref.style, Some("Bold".into()));
    assert!((pref.pt_size - 12.0).abs() < f32::EPSILON);
}

#[test]
fn pref_from_name_size() {
    let pref = FontPreference::from_name_style_size("Cantarell 12").unwrap();
    assert_eq!(pref.name, "Cantarell");
    assert_eq!(pref.style, None);
    assert!((pref.pt_size - 12.0).abs() < f32::EPSILON);
}

#[test]
fn pref_from_name() {
    let pref = FontPreference::from_name_style_size("Cantarell").unwrap();
    assert_eq!(pref.name, "Cantarell");
    assert_eq!(pref.style, None);
    assert!((pref.pt_size - 10.0).abs() < f32::EPSILON);
}
#[test]
fn pref_from_multi_name_style() {
    let pref = FontPreference::from_name_style_size("Foo Bar Baz Bold").unwrap();
    assert_eq!(pref.name, "Foo Bar Baz");
    assert_eq!(pref.style, Some("Bold".into()));
    assert!((pref.pt_size - 10.0).abs() < f32::EPSILON);
}