use core::fmt;
use regex::Regex;
use whois_rust::{WhoIs, WhoIsLookupOptions};

#[derive(Debug)]
enum RegistrantType {
    Registrant,
    Admin,
    Tech,
    Billing,
}

struct RegexQuery {
    re: Regex,
}

impl RegexQuery {
    fn new(expression: String) -> RegexQuery {
        let re = Regex::new(&expression).unwrap();
        RegexQuery { re }
    }

    fn get_matches(&self, haystack: &str) -> Vec<String> {
        let mut results = vec![];
        for (_, [_, rex2]) in self.re.captures_iter(haystack).map(|c| c.extract()) {
            results.push(String::from(rex2.trim()));
        }
        results
    }
}

#[derive(Debug)]
struct NameServer {
    host: String,
}

impl NameServer {
    fn new(host: String) -> NameServer {
        NameServer { host }
    }
}

#[derive(Debug)]
struct Registrant {
    name: String,
    org: String,
    email: String,
    rtype: RegistrantType,
}

impl fmt::Display for Registrant {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "")
    }
}

impl Registrant {
    fn new(name: String, org: String, email: String, rtype: RegistrantType) -> Registrant {
        Registrant {
            name,
            org,
            email,
            rtype,
        }
    }
}

pub struct WhoisData {
    registrar: String,
    domain_status: String,
    registrant: Vec<Registrant>,
    nameservers: Vec<NameServer>,
    dnssec: String,
}

impl fmt::Display for WhoisData {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(
            f,
            "Registrar: {}\nStatus: {}\nRegistrant: {:?}\nNameservers: {:?}\nDNSSEC: {}",
            self.registrar, self.domain_status, self.registrant, self.nameservers, self.dnssec
        )
    }
}

impl WhoisData {
    pub fn new(domain: String) -> WhoisData {
        let whois = WhoIs::from_path("servers.json").unwrap();
        let result: String = whois
            .lookup(WhoIsLookupOptions::from_string(domain).unwrap())
            .unwrap();
        let registrar_regex =
            RegexQuery::new(String::from(r"(?i)(.*registrar:|registrar *name:)(.*)"));
        let domain_status_regex =
            RegexQuery::new(String::from(r"(?i)(.*domain status:|.*status:)(.*)"));
        // TODO: Capture the registrant info for each type
        let registrant_name_regex = RegexQuery::new(String::from(r"(?i)(registrant.*name:)(.*)"));
        let registrant_org_regex =
            RegexQuery::new(String::from(r"(?i)(registrant org.*:|registrant:)(.*)"));
        let registrant_email_regex = RegexQuery::new(String::from(r"(?i)(registrant email:)(.*)"));

        let nameserver_regex =
            RegexQuery::new(String::from(r"(?i)(nameservers*:|name servers*:)(.*)"));
        let dnssec_regex = RegexQuery::new(String::from(r"(?i)(.*dnssec:)(.*)"));

        let registrar_caps = registrar_regex.get_matches(&result);
        let registrar: String;
        match registrar_caps.get(0) {
            Some(reg) => {
                registrar = reg.to_string();
            }
            None => {
                registrar = String::from("None");
            }
        }
        let domain_status_caps = domain_status_regex.get_matches(&result);
        let domain_status: String;
        match domain_status_caps.get(0) {
            Some(status) => {
                domain_status = status.to_string();
            }
            None => {
                domain_status = String::from("None");
            }
        }
        let reg_name_caps = registrant_name_regex.get_matches(&result);
        let reg_name: String;
        match reg_name_caps.get(0) {
            Some(name) => {
                reg_name = name.to_string();
            }
            None => {
                reg_name = String::from("None");
            }
        }

        let reg_org_caps = registrant_org_regex.get_matches(&result);
        let reg_org: String;
        match reg_org_caps.get(0) {
            Some(org) => {
                reg_org = org.to_string();
            }
            None => {
                reg_org = String::from("None");
            }
        }

        let reg_email_caps = registrant_email_regex.get_matches(&result);
        let reg_email: String;
        match reg_email_caps.get(0) {
            Some(email) => {
                reg_email = email.to_string();
            }
            None => {
                reg_email = String::from("None");
            }
        }

        let mut nameservers = vec![];
        for nameserver in nameserver_regex.get_matches(&result) {
            nameservers.push(NameServer::new(nameserver));
        }
        let dnssec = dnssec_regex.get_matches(&result);

        // println!("{:?}", registrar[0]);
        WhoisData {
            registrar: registrar.clone(),
            domain_status: domain_status.clone(),
            registrant: vec![Registrant::new(
                reg_name.clone(),
                reg_org.clone(),
                reg_email,
                RegistrantType::Registrant,
            )],
            nameservers: nameservers,
            dnssec: dnssec[0].clone(),
        }
    }
}