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//! The implementation for Version 5 UUIDs by Sha1 hashing.

use super::*;
use sha1::{Sha1, Digest};

impl Uuid {
    /// Creates a Version 5 UUID by Sha1 hashing a name from namespace and data
    ///
    /// There are 4 namespaces available in this crate:
    ///
    /// * NAMESPACE_DNS
    /// * NAMESPACE_OID
    /// * NAMESPACE_URL
    /// * NAMESPACE_X500
    ///
    /// Examples
    ///
    /// ```
    /// use yauuid::Uuid;
    ///
    /// let u = Uuid::new_v5(&Uuid::NAMESPACE_DNS, "python.org".as_bytes());
    /// ```
    pub fn new_v5(ns: &Uuid, data: &[u8]) -> Self {
        let mut result = Sha1::new()
            .chain(ns.as_bytes())
            .chain(data)
            .result();

        result[6] = (result[6] & 0x0f) | (0x5 << 4); // version 5
        result[8] = (result[8] & 0x3f) | 0x80;       // RFC4122 variant

        let mut uuid: [u8; 16] = Default::default();
        uuid.copy_from_slice(&result[..16]);
        Uuid::from_bytes(uuid)
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    static TESTS: &'static [(&'static Uuid, &'static str, &'static str)] = &[
        (
            &Uuid::NAMESPACE_DNS,
            "example.org",
            "aad03681-8b63-5304-89e0-8ca8f49461b5",
        ),
        (
            &Uuid::NAMESPACE_DNS,
            "rust-lang.org",
            "c66bbb60-d62e-5f17-a399-3a0bd237c503",
        ),
        (
            &Uuid::NAMESPACE_DNS,
            "42",
            "7c411b5e-9d3f-50b5-9c28-62096e41c4ed",
        ),
        (
            &Uuid::NAMESPACE_DNS,
            "lorem ipsum",
            "97886a05-8a68-5743-ad55-56ab2d61cf7b",
        ),
        (
            &Uuid::NAMESPACE_DNS,
            "python.org",
            "886313e1-3b8a-5372-9b90-0c9aee199e5d",
        ),
        (
            &Uuid::NAMESPACE_URL,
            "example.org",
            "54a35416-963c-5dd6-a1e2-5ab7bb5bafc7",
        ),
        (
            &Uuid::NAMESPACE_URL,
            "rust-lang.org",
            "c48d927f-4122-5413-968c-598b1780e749",
        ),
        (
            &Uuid::NAMESPACE_URL,
            "42",
            "5c2b23de-4bad-58ee-a4b3-f22f3b9cfd7d",
        ),
        (
            &Uuid::NAMESPACE_URL,
            "lorem ipsum",
            "15c67689-4b85-5253-86b4-49fbb138569f",
        ),
        (
            &Uuid::NAMESPACE_OID,
            "example.org",
            "34784df9-b065-5094-92c7-00bb3da97a30",
        ),
        (
            &Uuid::NAMESPACE_OID,
            "rust-lang.org",
            "8ef61ecb-977a-5844-ab0f-c25ef9b8d5d6",
        ),
        (
            &Uuid::NAMESPACE_OID,
            "42",
            "ba293c61-ad33-57b9-9671-f3319f57d789",
        ),
        (
            &Uuid::NAMESPACE_OID,
            "lorem ipsum",
            "6485290d-f79e-5380-9e64-cb4312c7b4a6",
        ),
        (
            &Uuid::NAMESPACE_X500,
            "example.org",
            "e3635e86-f82b-5bbc-a54a-da97923e5c76",
        ),
        (
            &Uuid::NAMESPACE_X500,
            "rust-lang.org",
            "26c9c3e9-49b7-56da-8b9f-a0fb916a71a3",
        ),
        (
            &Uuid::NAMESPACE_X500,
            "42",
            "e4b88014-47c6-5fe0-a195-13710e5f6e27",
        ),
        (
            &Uuid::NAMESPACE_X500,
            "lorem ipsum",
            "b11f79a5-1e6d-57ce-a4b5-ba8531ea03d0",
        ),
    ];

    #[test]
    fn test_new() {
        for &(ref ns, ref name, _) in TESTS {
            let uuid = Uuid::new_v5(*ns, name.as_bytes());
            assert_eq!(uuid.version(), Version(5));
            assert_eq!(uuid.variant(), Variant::RFC4122);
        }
    }

    #[test]
    fn test_to_string() {
        for &(ref ns, ref name, ref exp) in TESTS {
            let uuid = Uuid::new_v5(*ns, name.as_bytes());
            assert_eq!(uuid.to_string(), *exp);
        }
    }

}