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use yew::Classes;

/// Represent a value as CSS classes
///
/// Many variants and options need to be represented as CSS classes when rendering. This trait
/// provides a common way to turn some variant, value, enum into a set of classes.
///
/// In combination with [`ExtendClasses::extend_from`], this create a convenient way to
/// assemble a list of classes when rendering.
pub trait AsClasses {
    fn as_classes(&self) -> Classes {
        let mut classes = Classes::new();
        self.extend_classes(&mut classes);
        classes
    }

    fn extend_classes(&self, classes: &mut Classes);
}

impl AsClasses for String {
    fn extend_classes(&self, classes: &mut Classes) {
        classes.push(self)
    }
}

impl AsClasses for &str {
    fn extend_classes(&self, classes: &mut Classes) {
        classes.push(self.to_string())
    }
}

impl AsClasses for u16 {
    fn extend_classes(&self, classes: &mut Classes) {
        classes.push(self.to_string())
    }
}

impl AsClasses for dyn ToString {
    fn as_classes(&self) -> Classes {
        Classes::from(self.to_string())
    }

    fn extend_classes(&self, classes: &mut Classes) {
        classes.extend(Classes::from(self.to_string()))
    }
}

impl<T: AsClasses> AsClasses for Option<T> {
    fn extend_classes(&self, classes: &mut Classes) {
        match self {
            Some(a) => a.extend_classes(classes),
            None => {}
        }
    }
}

impl<T> AsClasses for Vec<T>
where
    T: AsClasses,
{
    fn extend_classes(&self, classes: &mut Classes) {
        for i in self {
            classes.extend(i.as_classes());
        }
    }
}

/// Allow extending a set of classes
pub trait ExtendClasses<A: AsClasses> {
    /// Extend a set of classes with a value implementing [`AsClasses`].
    fn extend_from(&mut self, from: &A);
}

impl<A: AsClasses> ExtendClasses<A> for Classes {
    fn extend_from(&mut self, from: &A) {
        from.extend_classes(self)
    }
}