vacant 0.3.0

Fast domain availability checker. Asks authoritative TLD nameservers directly instead of WHOIS.
Documentation 
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// ABOUTME: End-to-end check pipeline: normalize, cache, precheck, batch DNS+RDAP, write back.
// ABOUTME: Single source of truth shared by the standalone binary and the PyO3 binding.

use crate::{DiskCache, DnsClient, FullCheckJob, FullVerdict, PreCheck, RuleSet, Status};

#[derive(Debug, Clone)]
pub struct CheckResult {
    pub input: String,
    pub domain: String,
    pub zone: String,
    pub status: Status,
    pub detail: String,
    pub from_cache: bool,
}

pub fn check_many(
    rules: &RuleSet,
    dns: &DnsClient,
    cache: Option<&DiskCache>,
    inputs: &[String],
    cache_ttl_secs: i64,
    concurrency: usize,
) -> Vec<CheckResult> {
    let mut results: Vec<Option<CheckResult>> = vec![None; inputs.len()];
    let mut pending: Vec<(usize, String, String, Option<String>)> = Vec::new();

    for (i, raw) in inputs.iter().enumerate() {
        let cleaned = raw.trim().trim_end_matches('.').to_ascii_lowercase();

        if !cleaned.contains('.') {
            results[i] = Some(CheckResult {
                input: raw.clone(),
                domain: cleaned,
                zone: String::new(),
                status: Status::Invalid,
                detail: "input has no TLD".to_string(),
                from_cache: false,
            });
            continue;
        }

        if let Some(c) = cache {
            if let Ok(Some(row)) = c.get(&cleaned, cache_ttl_secs) {
                let status = parse_status(&row.status);
                results[i] = Some(CheckResult {
                    input: raw.clone(),
                    domain: row.domain,
                    zone: row.zone,
                    status,
                    detail: row.detail,
                    from_cache: true,
                });
                continue;
            }
        }

        match rules.precheck(&cleaned) {
            PreCheck::Verdict {
                status,
                detail,
                zone,
                registered,
            } => {
                results[i] = Some(CheckResult {
                    input: raw.clone(),
                    domain: registered,
                    zone,
                    status,
                    detail,
                    from_cache: false,
                });
            }
            PreCheck::Proceed {
                zone,
                registered,
                rdap,
                ..
            } => {
                pending.push((i, zone, registered, rdap));
            }
        }
    }

    if !pending.is_empty() {
        let jobs: Vec<FullCheckJob> = pending
            .iter()
            .map(|(_, zone, registered, rdap)| FullCheckJob {
                zone: zone.clone(),
                registered: registered.clone(),
                rdap_url: rdap.clone(),
            })
            .collect();
        let verdicts = dns.check_full_batch(jobs, concurrency);
        for ((i, zone, registered, _), v) in pending.into_iter().zip(verdicts) {
            results[i] = Some(verdict_to_result(&inputs[i], zone, registered, v));
        }
    }

    if let Some(c) = cache {
        for r in results.iter().flatten() {
            if r.from_cache || matches!(r.status, Status::Unknown) {
                continue;
            }
            let _ = c.put(&r.domain, &r.zone, r.status.as_str(), &r.detail);
        }
    }

    results.into_iter().flatten().collect()
}

fn verdict_to_result(input: &str, zone: String, registered: String, v: FullVerdict) -> CheckResult {
    let status = match v.kind {
        "registered" => Status::Registered,
        "available" => Status::Available,
        _ => Status::Unknown,
    };
    CheckResult {
        input: input.to_string(),
        domain: registered,
        zone,
        status,
        detail: v.detail,
        from_cache: false,
    }
}

fn parse_status(s: &str) -> Status {
    match s {
        "available" => Status::Available,
        "registered" => Status::Registered,
        "reserved" => Status::Reserved,
        "invalid" => Status::Invalid,
        _ => Status::Unknown,
    }
}