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use crate::libyaml::cstr;
use std::fmt::{self, Debug};
use std::ops::Deref;

#[derive(Ord, PartialOrd, Eq, PartialEq)]
pub(crate) struct Tag(pub(in crate::libyaml) Box<[u8]>);

impl Tag {
    pub const NULL: &'static str = "tag:yaml.org,2002:null";
    pub const BOOL: &'static str = "tag:yaml.org,2002:bool";
    pub const INT: &'static str = "tag:yaml.org,2002:int";
    pub const FLOAT: &'static str = "tag:yaml.org,2002:float";
}

impl Tag {
    pub fn starts_with(&self, prefix: &str) -> bool {
        self.0.starts_with(prefix.as_bytes())
    }
}

impl PartialEq<str> for Tag {
    fn eq(&self, other: &str) -> bool {
        *self.0 == *other.as_bytes()
    }
}

impl Deref for Tag {
    type Target = [u8];
    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl Debug for Tag {
    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        cstr::debug_lossy(&self.0, formatter)
    }
}