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// Copyright (C) 2020 Sebastian Dröge <sebastian@centricular.com>
//
// Licensed under the MIT license, see the LICENSE file or <http://opensource.org/licenses/MIT>

use super::*;

/// `Content-Length` header ([RFC 7826 section 18.17](https://tools.ietf.org/html/rfc7826#section-18.17)).
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub struct ContentLength(u64);

impl std::ops::Deref for ContentLength {
    type Target = u64;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl std::ops::DerefMut for ContentLength {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.0
    }
}

impl AsRef<u64> for ContentLength {
    fn as_ref(&self) -> &u64 {
        &self.0
    }
}

impl AsMut<u64> for ContentLength {
    fn as_mut(&mut self) -> &mut u64 {
        &mut self.0
    }
}

impl From<u64> for ContentLength {
    fn from(v: u64) -> ContentLength {
        ContentLength(v)
    }
}

impl From<ContentLength> for u64 {
    fn from(v: ContentLength) -> u64 {
        v.0
    }
}

impl super::TypedHeader for ContentLength {
    fn from_headers(headers: impl AsRef<Headers>) -> Result<Option<Self>, HeaderParseError> {
        let headers = headers.as_ref();

        let header = match headers.get(&CONTENT_LENGTH) {
            None => return Ok(None),
            Some(header) => header,
        };

        let length = header
            .as_str()
            .parse::<u64>()
            .map(ContentLength)
            .map_err(|_| HeaderParseError)?;

        Ok(Some(length))
    }

    fn insert_into(&self, mut headers: impl AsMut<Headers>) {
        let headers = headers.as_mut();

        headers.insert(CONTENT_LENGTH, self.0.to_string());
    }
}