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//! provides a http request nad response body entity interface

// Std
use std::borrow::Cow;

// Third Party
use bytes::Bytes;
use std::ops::Deref;

/// Representation of http request and response bodies
#[derive(Debug)]
pub enum Body {
    /// An empty body
    Empty,
    /// A body containing some bytes
    Bytes(Bytes),
}

impl Default for Body {
    fn default() -> Self {
        Body::Empty
    }
}

impl From<()> for Body {
    fn from(_: ()) -> Self {
        Body::Empty
    }
}

impl<'a> From<&'a str> for Body {
    fn from(s: &'a str) -> Self {
        Body::Bytes(Bytes::from(s))
    }
}

impl From<Vec<u8>> for Body {
    fn from(b: Vec<u8>) -> Self {
        Body::Bytes(Bytes::from(b))
    }
}

impl<'a> From<&'a [u8]> for Body {
    fn from(b: &'a [u8]) -> Self {
        Body::Bytes(Bytes::from(b))
    }
}

impl From<String> for Body {
    fn from(b: String) -> Self {
        Body::Bytes(Bytes::from(b))
    }
}

impl From<Cow<'static, str>> for Body {
    #[inline]
    fn from(cow: Cow<'static, str>) -> Body {
        match cow {
            Cow::Borrowed(b) => Body::from(b),
            Cow::Owned(o) => Body::from(o),
        }
    }
}

impl From<Cow<'static, [u8]>> for Body {
    #[inline]
    fn from(cow: Cow<'static, [u8]>) -> Body {
        match cow {
            Cow::Borrowed(b) => Body::from(b),
            Cow::Owned(o) => Body::from(o),
        }
    }
}

impl Deref for Body {
    type Target = [u8];

    #[inline]
    fn deref(&self) -> &Self::Target {
        self.as_ref()
    }
}

impl AsRef<[u8]> for Body {
    #[inline]
    fn as_ref(&self) -> &[u8] {
        match self {
            Body::Empty => &[],
            Body::Bytes(ref bytes) => bytes,
        }
    }
}