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use {Error, Result};

#[derive(PartialEq, Eq, Clone, Copy, Debug)]
pub enum Version {
    V0,
    V1,
}

use Version::*;

impl Version {
    pub fn from(raw: u64) -> Result<Version> {
        match raw {
            0 => Ok(V0),
            1 => Ok(V1),
            _ => Err(Error::InvalidCidVersion)
        }
    }

    pub fn is_v0_str(data: &str) -> bool {
        // v0 is a base58btc encoded sha hash, so it has
        // fixed length and always begins with "Qm"
        data.len() == 46 && data.starts_with("Qm")
    }

    pub fn is_v0_binary(data: &[u8]) -> bool {
        data.len() == 34 && data.starts_with(&[0x12,0x20])
    }
}

impl From<Version> for u64 {
    fn from(ver: Version) -> u64 {
        match ver {
            V0 => 0,
            V1 => 1,
        }
    }
}