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// License: see LICENSE file at root directory of `master` branch

//! # Version

use {
    alloc::string::String,
    core::{
        convert::TryFrom,
        fmt::{self, Display, Formatter},
        str::FromStr,
    },
};

use crate::Error;

const S_HTTP_0_9: &str = "HTTP/0.9";
const S_HTTP_1_0: &str = "HTTP/1.0";
const S_HTTP_1_1: &str = "HTTP/1.1";
const S_HTTP_2_0: &str = "HTTP/2.0";
const S_HTTP_3_0: &str = "HTTP/3.0";

/// # Version
///
/// ## Examples
///
/// ```
/// use htt::Version;
///
/// assert_eq!(Version::default(), Version::V1_1);
/// ```
///
/// ## References
///
/// - <https://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol>
#[derive(Debug, Eq, PartialEq, Hash, Clone, Ord, PartialOrd)]
pub enum Version {

    /// # 0.9 (1991)
    V0_9,

    /// # 1.0 (1996)
    V1_0,

    /// # 1.1 (1997)
    V1_1,

    /// # 2.0 (2015)
    V2_0,

    /// # 3.0 (2018)
    V3_0,

}

impl Default for Version {

    fn default() -> Self {
        Version::V1_1
    }

}

impl Display for Version {

    fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
        f.write_str(match self {
            Version::V0_9 => S_HTTP_0_9,
            Version::V1_0 => S_HTTP_1_0,
            Version::V1_1 => S_HTTP_1_1,
            Version::V2_0 => S_HTTP_2_0,
            Version::V3_0 => S_HTTP_3_0,
        })
    }

}

impl FromStr for Version {

    type Err = Error;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s {
            S_HTTP_0_9 => Ok(Version::V0_9),
            S_HTTP_1_0 => Ok(Version::V1_0),
            S_HTTP_1_1 => Ok(Version::V1_1),
            S_HTTP_2_0 => Ok(Version::V2_0),
            S_HTTP_3_0 => Ok(Version::V3_0),
            _ => Err(e!("Unknown version: {}", s)),
        }
    }

}

impl TryFrom<&[u8]> for Version {

    type Error = Error;

    fn try_from(bytes: &[u8]) -> Result<Self, Self::Error> {
        if S_HTTP_0_9.as_bytes() == bytes {
            return Ok(Version::V0_9);
        }
        if S_HTTP_1_0.as_bytes() == bytes {
            return Ok(Version::V1_0);
        }
        if S_HTTP_1_1.as_bytes() == bytes {
            return Ok(Version::V1_1);
        }
        if S_HTTP_2_0.as_bytes() == bytes {
            return Ok(Version::V2_0);
        }
        if S_HTTP_3_0.as_bytes() == bytes {
            return Ok(Version::V3_0);
        }

        Err(e!("Unknown version: {:?}...", String::from_utf8_lossy(&bytes[..bytes.len().min(20)])))
    }

}