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use crate::types::errors::TypeError;

#[derive(Debug, PartialEq, Eq)]
pub enum Unit {
    Cm,
    Feet,
    Inches,
    Km,
    M,
    Miles,
}

/// Specifies the measurement units for the [radius](crate::types::properties::radius::Radius) and
/// [altitude](crate::types::properties::altitude::Altitude) properties on a [Place](crate::types::extended::object::place::Place) object.
///
/// If not specified, the default is assumed to be "`m`" for "meters".
///
/// Specifications: <https://www.w3.org/TR/activitystreams-vocabulary/#dfn-units>
#[derive(Debug, PartialEq, Eq)]
pub struct Units(Unit);

impl Units {
    pub fn new(value: Option<Unit>) -> Result<Self, TypeError> {
        Ok(Self(value.unwrap_or(Unit::M)))
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_new() {
        let total_items = Units::new(Some(Unit::Km));

        assert!(total_items.is_ok());
        assert_eq!(total_items.unwrap(), Units(Unit::Km));
    }

    #[test]
    fn test_new_default() {
        let total_items = Units::new(None);

        assert!(total_items.is_ok());
        assert_eq!(total_items.unwrap(), Units(Unit::M));
    }
}