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use std::fmt::{self, Display, Formatter};
use std::error::Error;

/// An unknown license.
#[derive(Clone, Debug, Eq, PartialEq, Hash, Ord, PartialOrd)]
pub struct Unknown(String);

impl Unknown {
    /// Creates an unknown license.
    #[inline]
    pub fn new<T: Into<String>>(s: T) -> Unknown {
        Unknown(s.into())
    }

    /// The unrecognized license text.
    #[inline]
    pub fn text(&self) -> &str {
        &self.0
    }
}

impl Display for Unknown {
    #[inline]
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        if self.0.len() > 300 {
            write!(f, "{}:\n\n{} [..]", self.description(), &self.0[..300])
        } else {
            write!(f, "{}:\n\n{}", self.description(), self.0)
        }
    }
}

impl Error for Unknown {
    #[inline]
    fn description(&self) -> &str {
        "unable to recognize license from input"
    }
}