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use xdr_codec::{Pack, Write, Result, pack_string, pack_opaque_array};
use ::xdr::ToXdr;
use ::memo::Memo;


fn memo_tag(m: &Memo) -> i32 {
    match *m {
        Memo::None => 0,
        Memo::Text(_) => 1,
        Memo::Id(_) => 2,
        Memo::Hash(_) => 3,
        Memo::Return(_) => 4,
    }
}

impl<W: Write> Pack<W> for Memo {
    fn pack(&self, out: &mut W) -> Result<usize> {
        let tag = memo_tag(self);
        match *self {
            Memo::None => tag.pack(out),
            Memo::Text(ref text) => Ok(tag.pack(out)? + pack_string(&text, None, out)?),
            Memo::Id(ref id) => Ok(tag.pack(out)? + id.pack(out)?),
            Memo::Hash(ref hash) => Ok(tag.pack(out)? + pack_opaque_array(hash, 32, out)?),
            Memo::Return(ref hash) => Ok(tag.pack(out)? + pack_opaque_array(hash, 32, out)?),            
        }
    }
}

impl ToXdr for Memo {
    fn to_writer<W: Write>(&self, mut buf: W) -> ::error::Result<usize> {
        let r = self.pack(&mut buf)?;
        Ok(r)
    }
}

#[cfg(test)]
mod tests {
    use ::xdr::ToXdr;
    use Memo;

    #[test]
    fn test_none() {
        let m = Memo::None;
        let s = m.to_base64().unwrap();
        assert_eq!(s, "AAAAAA==");
    }

    #[test]
    fn test_text() {
        let m = Memo::Text("test post please ignore".to_string());
        let s = m.to_base64().unwrap();
        assert_eq!(s, "AAAAAQAAABd0ZXN0IHBvc3QgcGxlYXNlIGlnbm9yZQA=");
    }

    #[test]
    fn test_id() {
        let m = Memo::Id(1234);
        let s = m.to_base64().unwrap();
        assert_eq!(s, "AAAAAgAAAAAAAATS");
    }

    #[test]
    fn test_hash() {
        let m = Memo::Hash([0x2f, 0x1, 0x2, 0x3, 0x4, 0x5, 0x7, 0xAD, 0x2f, 0x1, 0x2, 0x3, 0x4,
                            0x5, 0x7, 0xAD, 0x2f, 0x1, 0x2, 0x3, 0x4, 0x5, 0x7, 0xAD, 0x2f, 0x1,
                            0x2, 0x3, 0x4, 0x5, 0x7, 0xAD]);
        let s = m.to_base64().unwrap();
        assert_eq!(s, "AAAAAy8BAgMEBQetLwECAwQFB60vAQIDBAUHrS8BAgMEBQet");
    }

    #[test]
    fn test_return() {
        let m = Memo::Return([0x2f, 0x1, 0x2, 0x3, 0x4, 0x5, 0x7, 0xAD, 0x2f, 0x1, 0x2, 0x3, 0x4,
                              0x5, 0x7, 0xAD, 0x2f, 0x1, 0x2, 0x3, 0x4, 0x5, 0x7, 0xAD, 0x2f,
                              0x1, 0x2, 0x3, 0x4, 0x5, 0x7, 0xAD]);
        let s = m.to_base64().unwrap();
        assert_eq!(s, "AAAABC8BAgMEBQetLwECAwQFB60vAQIDBAUHrS8BAgMEBQet");
    }

}