//! Identity, verification, and configuration commands.

use super::format::{short_id, signature_line, when};
use super::json;
use super::open;
use super::ui;
use anyhow::Result;
use oxy_core::hash::ChangeHash;
use oxy_core::hash::KeyId;
use oxy_core::identity::{Delegate, Identity, Scope};
use oxy_core::objects::Hlc;
use oxy_core::protocol::SignedPolicy;
use oxy_core::repo::{self, IdentityScope, PolicyUpdate, Repo, Rotation, SignatureStatus};
use std::path::{Path, PathBuf};

const DAY_MS: u64 = 24 * 60 * 60 * 1000;

fn expiry_from_days(days: u64) -> Option<u64> {
    (days > 0).then(|| Hlc::now().wall_ms + days * DAY_MS)
}

/// `30m`, `8h`, `7d`, or a bare number of days, as a wall time from now.
fn expiry_from_duration(s: &str) -> Result<u64> {
    let s = s.trim();
    let (n, unit) = match s.char_indices().find(|(_, c)| !c.is_ascii_digit()) {
        Some((i, _)) => (&s[..i], &s[i..]),
        None => (s, "d"),
    };
    let n: u64 = n.parse().map_err(|_| {
        anyhow::anyhow!("--expires takes 30m, 8h, 7d or a number of days, not {s:?}")
    })?;
    let ms = match unit {
        "m" => 60_000,
        "h" => 3_600_000,
        "d" => DAY_MS,
        _ => anyhow::bail!("--expires takes 30m, 8h, 7d or a number of days, not {s:?}"),
    };
    if n == 0 {
        anyhow::bail!("--expires needs a length of time; leave it out for no expiry");
    }
    Ok(Hlc::now().wall_ms + n * ms)
}

/// Print the delegates, one per line: who, their key, what they may do
/// and until when, so an agent's name is seen, not only its key.
fn print_delegates(repo: &Repo, delegates: &[Delegate]) {
    if delegates.is_empty() {
        return;
    }
    println!("{}", ui::kv("delegates", delegates.len().to_string()));
    let now = Hlc::now().wall_ms;
    for d in delegates {
        let who = repo
            .identity(&d.key)
            .map(|i| format!("{} <{}>", i.name, i.email))
            .unwrap_or_else(|_| "(unknown identity)".into());
        let until = match d.expires {
            Some(e) if now > e => ui::err(format!("expired {}", ui::ago(e))),
            Some(e) => ui::dim(format!("until {}", when(e))),
            None => String::new(),
        };
        println!(
            "    {}  {}  {} {}",
            ui::author(who),
            ui::hash(d.key.short(12)),
            ui::dim(d.scope.to_string()),
            until
        );
    }
}

/// Resolve a KeyId prefix among the identities the repository knows.
fn resolve_key(repo: &Repo, prefix: &str) -> Result<KeyId> {
    if let Some(k) = KeyId::from_hex(prefix) {
        return Ok(k);
    }
    let mut candidates: Vec<KeyId> = Vec::new();
    if let Some((_, sp)) = repo.current_policy()? {
        candidates.extend(sp.policy.identities.iter().map(|i| i.hash()));
        candidates.extend(sp.policy.revoked.iter().copied());
    }
    if let Some(own) = repo.config.author_key {
        candidates.push(own);
        if let Ok(id) = repo.identity(&own) {
            candidates.extend(id.delegates.iter().map(|d| d.key));
        }
    }
    candidates.sort();
    candidates.dedup();
    let matches: Vec<_> = candidates
        .into_iter()
        .filter(|k| k.starts_with_hex(prefix))
        .collect();
    match matches.len() {
        1 => Ok(matches[0]),
        0 => anyhow::bail!("no known key starts with {prefix:?}"),
        _ => anyhow::bail!("{prefix:?} is ambiguous"),
    }
}

/// Report a policy update: applied, or written out as a proposal that
/// other root holders sign with `oxy policy sign`.
fn report_update(u: &PolicyUpdate, out: Option<PathBuf>) -> Result<()> {
    if u.applied {
        println!(
            "{} policy serial {} {}",
            ui::done("Applied"),
            u.policy.serial,
            ui::dim("(push to publish it)")
        );
        return Ok(());
    }
    let path = out.unwrap_or_else(|| PathBuf::from(format!("policy-{}.proposal", u.policy.serial)));
    std::fs::write(&path, u.signed().encode())?;
    println!(
        "{} policy serial {} needs {} of {} root signatures; has {}. Wrote {} for another root to run {}",
        ui::caution(),
        u.policy.serial,
        u.policy.root_threshold,
        u.policy.roots.len(),
        u.sigs.len(),
        ui::path(path.display()),
        ui::dim(format!("oxy policy sign {}", path.display()))
    );
    Ok(())
}

fn report_rotation(repo: &Repo, r: &Rotation, verb: &str) -> Result<()> {
    println!(
        "{} identity {} <{}>",
        ui::done(verb),
        ui::author(&r.identity.name),
        r.identity.email
    );
    println!("{}", ui::kv("old key", ui::dim(r.old.to_hex())));
    println!("{}", ui::kv("new key", r.new.to_hex()));
    print_delegates(repo, &r.identity.delegates);
    if let Some(e) = r.identity.expires {
        println!("{}", ui::kv("expires", when(e)));
    }
    match &r.policy {
        Some(u) => report_update(u, None)?,
        None => println!(
            "  {} {}",
            ui::note(),
            ui::dim("no policy names the old key; export the new identity for policy holders")
        ),
    }
    Ok(())
}

pub fn create(
    name: Option<String>,
    email: Option<String>,
    local: bool,
    expires: Option<u64>,
) -> Result<i32> {
    let mut repo = open()?;
    let name = name.unwrap_or_else(|| repo.config.author_name.clone());
    let email = email.unwrap_or_else(|| repo.config.author_email.clone());
    let scope = if local {
        IdentityScope::Repo
    } else {
        IdentityScope::User
    };
    let (key, _) =
        repo.create_identity_with(&name, &email, scope, expires.and_then(expiry_from_days))?;
    println!(
        "{} identity {} <{email}>",
        ui::done("Created"),
        ui::author(&name)
    );
    println!("{}", ui::kv("key", key));
    println!(
        "{}",
        ui::kv("secret", ui::path(repo::default_keys_dir().display()))
    );
    match scope {
        IdentityScope::User => println!(
            "{}",
            ui::kv(
                "scope",
                format!(
                    "default author in {}",
                    ui::path(repo.user_config_path().display())
                )
            )
        ),
        IdentityScope::Repo => {
            println!("{}", ui::kv("scope", "this repository's .oxy/config only"))
        }
    }
    if !repo.config.sign_changes {
        println!("  {} {}", ui::note(), ui::dim("changes will carry this author; run oxy config --user core.sign change to sign each commit"));
    }
    Ok(0)
}

pub fn show() -> Result<i32> {
    let repo = open()?;
    let Some(key) = repo.config.author_key else {
        println!("No identity configured; run `oxy identity create`.");
        return Ok(0);
    };
    let id = repo.identity(&key)?;
    println!(
        "{} {} <{}>",
        ui::section("identity"),
        ui::author(&id.name),
        id.email
    );
    println!("{}", ui::kv("key", key));
    println!(
        "{}",
        ui::kv(
            "created",
            format!(
                "{} {}",
                when(id.created),
                ui::dim(format!("({})", ui::ago(id.created)))
            )
        )
    );
    if let Some(e) = id.expires {
        let expired = id.is_expired_at(Hlc::now().wall_ms);
        println!(
            "{}",
            ui::kv(
                "expires",
                if expired {
                    ui::err(format!("{} EXPIRED", when(e)))
                } else {
                    when(e)
                }
            )
        );
    }
    if let Some(p) = id.previous {
        println!("{}", ui::kv("previous", ui::dim(p.short(12))));
    }
    // A repository that pins one key while the user file names another is
    // how checkouts drift apart after a rotation (oxygen#69).
    if let Some(pinned) = repo
        .config
        .repo_layer()
        .get("author.key")
        .and_then(|k| oxy_core::hash::KeyId::from_hex(k))
    {
        let user_key = repo::read_config_file(&repo::default_user_config())
            .ok()
            .and_then(|m| {
                m.get("author.key")
                    .and_then(|k| oxy_core::hash::KeyId::from_hex(k))
            });
        if let Some(u) = user_key.filter(|u| *u != pinned) {
            let related = |from: oxy_core::hash::KeyId, to: oxy_core::hash::KeyId| {
                let mut cur = Some(from);
                for _ in 0..64 {
                    match cur {
                        Some(k) if k == to => return true,
                        Some(k) => cur = repo.identity(&k).ok().and_then(|i| i.previous),
                        None => break,
                    }
                }
                false
            };
            let how = if related(pinned, u) {
                "an older key of this identity"
            } else if related(u, pinned) {
                "a newer key of this identity"
            } else {
                "another key"
            };
            println!(
                "  {} {}",
                ui::caution(),
                ui::dim(format!(
                    "this repository pins author.key {}; your user config names {how}, {}. Other checkouts follow the user config: `oxy config --unset author.key` here, or `oxy config --user author.key {}`",
                    pinned.short(12),
                    u.short(12),
                    pinned.to_hex()
                ))
            );
        }
    }
    print_delegates(&repo, &id.delegates);
    if repo.is_revoked(&key)? {
        println!(
            "{}",
            ui::kv(
                "status",
                ui::err(format!("{} REVOKED", ui::glyph("✖", "x")))
            )
        );
    }
    println!(
        "{}",
        ui::kv(
            "secret",
            if repo.secret_key()?.is_some() {
                ui::ok(format!("{} available", ui::glyph("✔", "*")))
            } else {
                ui::err(format!(
                    "{} not found in the key directory",
                    ui::glyph("✖", "x")
                ))
            }
        )
    );
    println!(
        "{}",
        ui::kv(
            "signing",
            if repo.config.sign_changes {
                "every change (core.sign = change)"
            } else {
                "at push via seals (core.sign = seal)"
            }
        )
    );
    Ok(0)
}

pub fn verify(change: Option<&str>, revset: Option<&str>, as_json: bool) -> Result<i32> {
    let repo = open()?;
    let hashes: Vec<ChangeHash> = match (change, revset) {
        (_, Some(r)) => {
            let wc = repo.working_copy().ok().map(|(h, _)| h);
            repo.revset(r)?
                .hashes
                .into_iter()
                .filter(|h| Some(*h) != wc)
                .collect()
        }
        (Some(c), None) => vec![repo.resolve_change(c)?],
        (None, None) => repo
            .log()?
            .into_iter()
            .filter(|e| !e.is_working_copy)
            .map(|e| e.hash)
            .collect(),
    };
    let mut bad = 0;
    if as_json {
        let mut items = Vec::new();
        for h in &hashes {
            let Ok(c) = repo.store().get_change(h) else {
                continue;
            };
            let (status, key, name, revoked, reason) = match repo.authenticate_change(h)? {
                SignatureStatus::Unsigned => ("unsigned", None, None, false, None),
                SignatureStatus::Valid {
                    key,
                    name,
                    sealed,
                    revoked,
                    ..
                } => (
                    if sealed { "sealed" } else { "signed" },
                    Some(key.to_hex()),
                    Some(name),
                    revoked,
                    None,
                ),
                SignatureStatus::Invalid(why) => {
                    bad += 1;
                    ("invalid", None, None, false, Some(why))
                }
            };
            items.push(json::obj([
                ("hash", json::s(&h.to_hex())),
                ("change_id", json::s(&c.change_id.to_hex())),
                ("status", json::s(status)),
                ("key", json::opt(key.as_deref(), json::s)),
                ("name", json::opt(name.as_deref(), json::s)),
                ("revoked", json::b(revoked)),
                ("reason", json::opt(reason.as_deref(), json::s)),
            ]));
        }
        println!("{}", json::arr(items));
        return Ok(if bad > 0 { 1 } else { 0 });
    }
    for h in hashes {
        let Ok(c) = repo.store().get_change(&h) else {
            println!(
                "{}  {}",
                ui::hash(format!("#{}", h.short(12))),
                ui::dim("not present (shallow)")
            );
            continue;
        };
        let line = signature_line(&repo, &h)?;
        let styled = if line.starts_with("INVALID") {
            bad += 1;
            ui::err(format!("{} {line}", ui::glyph("✖", "x")))
        } else if line == "unsigned" {
            ui::dim(format!("{} {line}", ui::glyph("·", "-")))
        } else {
            ui::ok(format!("{} {line}", ui::glyph("✔", "v")))
        };
        println!(
            "{} {}  {styled}",
            ui::id(short_id(&c)),
            ui::hash(format!("#{}", h.short(12)))
        );
    }
    Ok(if bad > 0 { 1 } else { 0 })
}

/// Whether a configuration key holds a secret, never to be printed.
fn secret_key(key: &str) -> bool {
    let k = key.to_ascii_lowercase();
    k.ends_with(".token") || k.contains("secret") || k.contains("password")
}

/// A secret as a confirmation may show it (oxygen#113): enough of its start
/// to tell which one it is, never the rest.
fn mask(value: &str) -> String {
    let shown: String = value.chars().take(10).collect();
    let rest = value.chars().count().saturating_sub(10);
    if rest == 0 {
        "…".to_string()
    } else {
        format!("{shown}…({rest} more)")
    }
}

pub fn config(key: &str, value: &str, user: bool, unset: bool) -> Result<i32> {
    // An empty value removes the key, which is what --unset says plainly.
    // `-` reads the value from standard input, so a token never sits in
    // the shell's history (oxygen#113).
    let read;
    let value = if unset {
        ""
    } else if value == "-" {
        let mut line = String::new();
        std::io::stdin().read_line(&mut line)?;
        read = line.trim().to_string();
        read.as_str()
    } else {
        value
    };
    let said = if unset {
        format!("{} {key}", ui::done("Unset"))
    } else if secret_key(key) {
        format!("{} {key} = {}", ui::done("Set"), mask(value))
    } else {
        format!("{} {key} = {value}", ui::done("Set"))
    };
    if user {
        let path = repo::default_user_config();
        repo::Config::set_user(&path, key, value)?;
        println!("{said} {}", ui::dim(format!("(in {})", path.display())));
    } else {
        let mut repo = open()?;
        repo.config.set(key, value)?;
        repo.save_config()?;
        println!("{said} {}", ui::dim("(in this repository)"));
    }
    Ok(0)
}

pub fn export(path: Option<PathBuf>) -> Result<i32> {
    let repo = open()?;
    let Some(key) = repo.config.author_key else {
        anyhow::bail!("no identity configured; run `oxy identity create`");
    };
    let id = repo.identity(&key)?;
    let path = path.unwrap_or_else(|| PathBuf::from(format!("{}.identity", key.short(16))));
    std::fs::write(&path, id.encode())?;
    println!(
        "{} identity {} <{}> ({}) to {}",
        ui::done("Wrote"),
        ui::author(&id.name),
        id.email,
        key.short(12),
        ui::path(path.display())
    );
    Ok(0)
}

pub fn rotate() -> Result<i32> {
    let mut repo = open()?;
    let r = repo.rotate_identity()?;
    report_rotation(&repo, &r, "Rotated")?;
    Ok(0)
}

pub fn renew(expires: u64) -> Result<i32> {
    let mut repo = open()?;
    let r = repo.renew_identity(expiry_from_days(expires))?;
    report_rotation(&repo, &r, "Renewed")?;
    Ok(0)
}

pub fn revoke(key: Option<&str>, reason: &str) -> Result<i32> {
    let repo = open()?;
    let key = match key {
        Some(k) => resolve_key(&repo, k)?,
        None => repo
            .config
            .author_key
            .ok_or_else(|| anyhow::anyhow!("no identity configured"))?,
    };
    let update = repo.revoke_identity(&key, reason)?;
    println!(
        "{} key {}{}",
        ui::done("Revoked"),
        ui::hash(key.short(12)),
        if reason.is_empty() {
            String::new()
        } else {
            format!(": {reason}")
        }
    );
    match update {
        Some(u) => report_update(&u, None)?,
        None => println!(
            "  {} {}",
            ui::note(),
            ui::dim("recorded locally; no policy named the key")
        ),
    }
    // A revoked delegate comes off the identity too, so the successor no
    // longer names it (spec §14.2).
    let own = repo.config.author_key;
    let delegated = own.is_some_and(|o| {
        repo.identity(&o)
            .is_ok_and(|id| id.delegate(&key).is_some())
    });
    if delegated {
        let mut repo = repo;
        let r = repo.delegate_remove(&key)?;
        report_rotation(&repo, &r, "Undelegated")?;
        return Ok(0);
    }
    if repo.config.author_key == Some(key) {
        println!(
            "  {} {}",
            ui::caution(),
            ui::warn("this was your configured key; run oxy identity create or rotate")
        );
    }
    Ok(0)
}

pub fn delegate_add(identity_files: &[PathBuf], scope: &str, expires: Option<&str>) -> Result<i32> {
    let mut repo = open()?;
    let ids = identity_files
        .iter()
        .map(|f| {
            Identity::decode(
                &std::fs::read(f).map_err(|e| anyhow::anyhow!("{}: {e}", f.display()))?,
            )
            .map_err(Into::into)
        })
        .collect::<Result<Vec<_>>>()?;
    let scope = Scope::parse(scope).map_err(|e| anyhow::anyhow!("{e}"))?;
    let expires = expires.map(expiry_from_duration).transpose()?;
    let r = repo.delegate_add_many(ids, scope, expires)?;
    report_rotation(&repo, &r, "Delegated")?;
    println!(
        "  {} {}",
        ui::note(),
        ui::dim("an agent configured with your author.key needs the new key: oxy config --user author.key NEW in its home")
    );
    if !scope.has(Scope::REFS) {
        println!(
            "  {} {}",
            ui::note(),
            ui::dim("it may not move references: a push or tag it attests is refused")
        );
    }
    Ok(0)
}

pub fn delegate_remove(key: &str) -> Result<i32> {
    let mut repo = open()?;
    let k = resolve_key(&repo, key)?;
    let r = repo.delegate_remove(&k)?;
    report_rotation(&repo, &r, "Undelegated")?;
    Ok(0)
}

pub fn delegate_list() -> Result<i32> {
    let repo = open()?;
    let Some(key) = repo.config.author_key else {
        println!("No identity configured; run `oxy identity create`.");
        return Ok(0);
    };
    let id = repo.identity(&key)?;
    if id.delegates.is_empty() {
        println!("{}", ui::dim("No delegates."));
    }
    let now = Hlc::now().wall_ms;
    for d in &id.delegates {
        let who = repo
            .identity(&d.key)
            .map(|i| format!("{} <{}>", i.name, i.email))
            .unwrap_or_else(|_| "(unknown identity)".into());
        let until = match d.expires {
            Some(e) if now > e => ui::err(format!("expired {}", ui::ago(e))),
            Some(e) => ui::dim(format!("until {}", when(e))),
            None => String::new(),
        };
        println!(
            "  {} {}  {}  {} {}",
            ui::ok(ui::glyph("🔑", "*")),
            ui::hash(d.key.short(12)),
            ui::author(who),
            ui::dim(d.scope.to_string()),
            until
        );
    }
    Ok(0)
}

pub fn policy_root_add(identity_file: &Path, out: Option<PathBuf>) -> Result<i32> {
    let repo = open()?;
    let id = Identity::decode(&std::fs::read(identity_file)?)?;
    let key = id.hash();
    let u = repo.policy_root_add(id.clone())?;
    println!(
        "{} root {} <{}> ({})",
        ui::done("Added"),
        ui::author(&id.name),
        id.email,
        key.short(12)
    );
    report_update(&u, out)?;
    Ok(0)
}

pub fn policy_root_remove(key: &str, out: Option<PathBuf>) -> Result<i32> {
    let repo = open()?;
    let k = resolve_key(&repo, key)?;
    let u = repo.policy_root_remove(&k)?;
    println!("{} root {}", ui::done("Removed"), ui::hash(k.short(12)));
    report_update(&u, out)?;
    Ok(0)
}

pub fn policy_threshold(n: u32, out: Option<PathBuf>) -> Result<i32> {
    let repo = open()?;
    let u = repo.policy_set_threshold(n)?;
    println!("{} root threshold to {n}", ui::done("Set"));
    report_update(&u, out)?;
    Ok(0)
}

pub fn policy_sign(proposal: &Path, out: Option<PathBuf>) -> Result<i32> {
    let repo = open()?;
    let sp = SignedPolicy::decode(&std::fs::read(proposal)?)?;
    let u = repo.policy_sign(sp)?;
    println!("{} policy serial {}", ui::done("Signed"), u.policy.serial);
    report_update(&u, Some(out.unwrap_or_else(|| proposal.to_path_buf())))?;
    Ok(0)
}

pub fn policy_init() -> Result<i32> {
    let repo = open()?;
    let sp = repo.policy_init()?;
    println!(
        "{} policy with root key {}",
        ui::done("Created"),
        sp.policy.roots[0].short(12)
    );
    report_update(&sp, None)?;
    Ok(0)
}

pub fn policy_show(as_json: bool) -> Result<i32> {
    let repo = open()?;
    let Some((r, sp)) = repo.current_policy()? else {
        if as_json {
            println!("null");
        } else {
            println!(
                "No policy: this repository is unverified. Run `oxy policy init` to create one."
            );
        }
        return Ok(0);
    };
    let p = &sp.policy;
    if as_json {
        let ident = |k: &oxy_core::hash::KeyId| {
            let (name, email) = p
                .identity(k)
                .map(|i| (i.name.clone(), i.email.clone()))
                .unwrap_or_default();
            json::obj([
                ("key", json::s(&k.to_hex())),
                ("name", json::s(&name)),
                ("email", json::s(&email)),
            ])
        };
        println!(
            "{}",
            json::obj([
                ("hash", json::s(&r.to_hex())),
                ("serial", json::n(p.serial)),
                ("expires_ms", json::n(p.expires)),
                (
                    "expired",
                    json::b(p.is_expired(oxy_core::objects::Hlc::now().wall_ms))
                ),
                ("root_threshold", json::n(p.root_threshold)),
                ("roots", json::arr(p.roots.iter().map(ident))),
                (
                    "rules",
                    json::arr(p.rules.iter().map(|rule| {
                        json::obj([
                            ("pattern", json::s(&rule.pattern)),
                            ("keys", json::arr(rule.keys.iter().map(ident))),
                            ("threshold", json::n(rule.threshold)),
                            ("require", json::s(rule.require.name())),
                            ("allow_conflicts", json::b(rule.allow_conflicts)),
                        ])
                    })),
                ),
                ("revoked", json::arr(p.revoked.iter().map(ident))),
            ])
        );
        return Ok(0);
    }
    let name = |k: &oxy_core::hash::KeyId| {
        p.identity(k)
            .map(|i| format!("{} <{}>", i.name, i.email))
            .unwrap_or_else(|| "(unknown identity)".into())
    };
    let expired = p.is_expired(oxy_core::objects::Hlc::now().wall_ms);
    println!(
        "{} {}{}serial {}{}expires {}{}",
        ui::section("policy"),
        ui::hash(format!("#{}", r.short(12))),
        ui::sep(),
        p.serial,
        ui::sep(),
        when(p.expires),
        if expired {
            ui::err(format!("  {} EXPIRED", ui::glyph("✖", "x")))
        } else {
            String::new()
        }
    );
    println!(
        "{}",
        ui::section(format!(
            "roots {}",
            ui::dim(format!("(threshold {})", p.root_threshold))
        ))
    );
    for k in &p.roots {
        println!(
            "  {} {}  {}",
            ui::ok(ui::glyph("🔑", "*")),
            ui::hash(k.short(12)),
            ui::author(name(k))
        );
    }
    println!("{}", ui::section("rules"));
    for rule in &p.rules {
        println!(
            "  {} {:12} {}",
            ui::ok(ui::glyph("▸", ">")),
            ui::bookmark(&rule.pattern),
            ui::dim(format!(
                "threshold {}, require {}, conflicts {}",
                rule.threshold,
                rule.require.name(),
                if rule.allow_conflicts {
                    "allowed"
                } else {
                    "refused"
                }
            ))
        );
        for k in &rule.keys {
            println!("      {}  {}", ui::hash(k.short(12)), ui::author(name(k)));
        }
    }
    if !p.revoked.is_empty() {
        println!("{}", ui::section("revoked"));
        for k in &p.revoked {
            println!(
                "  {} {}  {}",
                ui::err(ui::glyph("✖", "x")),
                ui::hash(k.short(12)),
                ui::author(name(k))
            );
        }
    }
    Ok(0)
}

pub fn policy_grant(
    identity_file: &Path,
    pattern: Option<&str>,
    out: Option<PathBuf>,
) -> Result<i32> {
    let repo = open()?;
    let id = Identity::decode(&std::fs::read(identity_file)?)?;
    let key = id.hash();
    let u = repo.policy_grant(id.clone(), pattern)?;
    println!(
        "{} {} <{}> ({}) on {}",
        ui::done("Granted"),
        ui::author(&id.name),
        id.email,
        key.short(12),
        ui::bookmark(pattern.unwrap_or("*"))
    );
    report_update(&u, out)?;
    Ok(0)
}

pub fn policy_revoke(key: &str, out: Option<PathBuf>) -> Result<i32> {
    let repo = open()?;
    if repo.current_policy()?.is_none() {
        anyhow::bail!("this repository has no policy");
    }
    let full = resolve_key(&repo, key)?;
    let u = repo.policy_revoke(&full)?;
    println!("{} {}", ui::done("Revoked"), ui::hash(full.short(12)));
    report_update(&u, out)?;
    Ok(0)
}

/// `oxy seal [CHANGE..]`: seal the named changes, or every sealable one.
pub fn seal(specs: &[String], as_json: bool) -> Result<i32> {
    let repo = Repo::open(&std::env::current_dir()?)?;
    let hashes: Vec<_> = if specs.is_empty() {
        repo.sealable()?
    } else {
        specs
            .iter()
            .map(|s| repo.resolve_change(s))
            .collect::<std::result::Result<_, _>>()?
    };
    if hashes.is_empty() {
        if as_json {
            println!("{{\"sealed\":[]}}");
        } else {
            println!(
                "{} nothing to seal: every change you can authenticate already is",
                ui::done("Sealed")
            );
        }
        return Ok(0);
    }
    let mut refs = Vec::new();
    for chunk in hashes.chunks(oxy_core::attest::MAX_SEAL_HASHES) {
        refs.push(repo.seal(chunk)?);
    }
    if as_json {
        let list: Vec<String> = hashes
            .iter()
            .map(|h| format!("\"{}\"", h.to_hex()))
            .collect();
        let seals: Vec<String> = refs.iter().map(|r| format!("\"{}\"", r.to_hex())).collect();
        println!(
            "{{\"sealed\":[{}],\"seals\":[{}]}}",
            list.join(","),
            seals.join(",")
        );
    } else {
        println!(
            "{} {} change{} in {} seal{}; they travel with your next push",
            ui::done("Sealed"),
            hashes.len(),
            if hashes.len() == 1 { "" } else { "s" },
            refs.len(),
            if refs.len() == 1 { "" } else { "s" }
        );
        for h in &hashes {
            let title = repo
                .store()
                .get_change(h)
                .map(|c| c.message.lines().next().unwrap_or("").to_string())
                .unwrap_or_default();
            println!("  {} {}", ui::hash(h.short(12)), title);
        }
    }
    Ok(0)
}

/// `oxy identity sign-challenge HEX`: the composite signature over a
/// host's challenge, as hex of the CBOR signature (hub spec §5.3).
pub fn sign_challenge(challenge_hex: &str, as_json: bool) -> Result<i32> {
    let repo = open()?;
    let Some((key, sk)) = repo.secret_key()? else {
        anyhow::bail!("no secret key: run `oxy identity create` first");
    };
    let challenge = hex_bytes(challenge_hex.trim())
        .ok_or_else(|| anyhow::anyhow!("the challenge must be hex"))?;
    let sig = sk
        .sign_challenge(&key, &challenge)
        .map_err(|e| anyhow::anyhow!("{e}"))?;
    let encoded = hex_string(&oxy_core::identity::Signature::encode_list(&[sig]));
    if as_json {
        println!(
            "{{\"key\":\"{}\",\"signature\":\"{}\"}}",
            key.to_hex(),
            encoded
        );
    } else {
        println!("{encoded}");
    }
    Ok(0)
}

fn hex_bytes(s: &str) -> Option<Vec<u8>> {
    if !s.len().is_multiple_of(2) {
        return None;
    }
    (0..s.len())
        .step_by(2)
        .map(|i| u8::from_str_radix(&s[i..i + 2], 16).ok())
        .collect()
}

fn hex_string(b: &[u8]) -> String {
    b.iter().map(|x| format!("{x:02x}")).collect()
}

#[cfg(test)]
mod tests {
    #[test]
    fn secrets_are_never_printed_whole() {
        assert!(
            super::secret_key("remote.earth.token")
                && super::secret_key("auth.secret")
                && !super::secret_key("remote.earth.url")
        );
        assert_eq!(
            super::mask("oxyhub_6b7dce13409b634d"),
            "oxyhub_6b7…(13 more)"
        );
        assert_eq!(super::mask("short"), "…");
    }
}