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//! Node name parsing utilities

use std::convert::TryFrom;

use regex::Regex;

use cjdns_core::RoutingLabel;
use cjdns_keys::CJDNSPublicKey;

lazy_static! {
    static ref NODE_NAME_RE: Regex = Regex::new(
        "^v([0-9]+)\\.\
        ([[:xdigit:]]{4}\\.[[:xdigit:]]{4}\\.[[:xdigit:]]{4}\\.[[:xdigit:]]{4})\\.\
        ([a-z0-9]{52}\\.k)"
    )
    .expect("bad regexp");
}

/// Gets version, label and public key all together in tuple from `name` argument, if it has valid structure.
/// Otherwise returns error.
pub fn parse_node_name(name: &str) -> Result<(u16, RoutingLabel<u64>, CJDNSPublicKey), ()> {
    if let Some(c) = NODE_NAME_RE.captures(name) {
        let str_from_captured_group = |group_num: usize| -> &str { c.get(group_num).expect("bad group index").as_str() };
        let version = str_from_captured_group(1).parse::<u16>().expect("bad regexp - version");
        let label = RoutingLabel::try_from(str_from_captured_group(2)).expect("bad regexp - label");
        let public_key = CJDNSPublicKey::try_from(str_from_captured_group(3)).or(Err(()))?;
        Ok((version, label, public_key))
    } else {
        Err(())
    }
}

#[test]
fn test_parse_node_name_valid() {
    let valid_node_names = vec![
        "v19.0000.0000.0000.0863.2v6dt6f841hzhq2wsqwt263w2dswkt6fz82vcyxqptk88mtp8y50.k",
        "v10.0a20.00ff.00e0.9901.qgkjd0stfvk9r3j28s4gh8rgslbgx2r5xgxzxkgm5vdxqwn8xsu0.k",
    ];
    for valid_node_name in valid_node_names {
        assert!(parse_node_name(valid_node_name).is_ok());
    }
}

#[test]
fn test_parse_node_name_invalid() {
    let invalid_node_names = vec![
        "12foo",
        "",
        "19.0000.0000.0000.0863.2v6dt6f841hzhq2wsqwt263w2dswkt6fz82vcyxqptk88mtp8y50.k",
        "v1234123123.0000.00000.000.0863.2v6dt6f841hzhq2wsqwt263w2dswkt6fz82vcyxqptk88mtp8y50.k",
        "v19.0000.0000.0000.0863.2v6dt6f841hZhq2wsqwt263w2dswkt6fz82vcyxqptk88mtp8y50.k",
        "v19.0ffe.1200.0000.0863.2v6dt6f841hzhq2wsqwt263w2dswkt6fz82vcyxqptk88mtpy50.k",
        "v19.gh00.0000.0000.0863.2v6dt6f841hzhq2wsqwt263w2dswkt6fz82vcyxqptk88mtp8y50.k",
        "v10.0000.0000.0000.0001.aer2z2s3hnr0qzpk2u121uqjv15dc335v54pccqlqj6c5p840yy0.k",
        "v10.0a20.00ff.00e0.9901.xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.k)",
    ];
    for invalid_node_name in invalid_node_names {
        assert!(parse_node_name(invalid_node_name).is_err());
    }
}