vanta-cli 0.0.7

//! `vanta-cli` — the command surface behind the `vanta` binary.
//!
//! Implements the commands documented in `docs/04-cli.md`, wiring the CLI to the
//! resolver, registry, install engine, environment, and diagnostics subsystems.
#![forbid(unsafe_code)]

use std::cell::RefCell;
use std::collections::{BTreeMap, HashSet};
use std::path::{Path, PathBuf};
use std::process::Command;
use vanta_core::{Area, ExitCode, Platform, Request, StoreKey, VersionReq, VtaError, VtaResult};
use vanta_install::Engine;
use vanta_registry::Registry;
use vanta_resolve::{artifact_for, Resolver};
use vanta_ui::Progress;

/// The crate version, surfaced by `vanta --version`.
pub const VERSION: &str = env!("CARGO_PKG_VERSION");

/// Drives the branded install UI (download bar + phase spinner) for one tool.
///
/// Implements [`vanta_install::Reporter`]; the engine calls back as it fetches
/// and materializes the artifact. The active indicator is swapped in place so a
/// single line is shown and cleared, leaving only the final `✓` summary.
struct InstallUi {
    /// Human label for the tool being installed, e.g. `node 22.3.0`.
    label: String,
    bar: RefCell<Option<Progress>>,
}

impl InstallUi {
    fn new(label: String) -> InstallUi {
        InstallUi {
            label,
            bar: RefCell::new(None),
        }
    }

    /// Emit the final success summary for this tool, clearing any live bar.
    fn finish_ok(&self, msg: &str) {
        match self.bar.borrow().as_ref() {
            Some(bar) => bar.finish_ok(msg),
            None => vanta_ui::step(msg),
        }
    }
}

impl vanta_install::Reporter for InstallUi {
    fn fetch_start(&self, total: Option<u64>) {
        let bar = Progress::new_bar(&format!("downloading {}", self.label), total);
        *self.bar.borrow_mut() = Some(bar);
    }

    fn fetch_inc(&self, n: u64) {
        if let Some(bar) = self.bar.borrow().as_ref() {
            bar.inc(n);
        }
    }

    fn phase(&self, name: &str) {
        // Swap the download bar for an indeterminate spinner during the
        // (typically brief) verify/extract phases.
        let mut slot = self.bar.borrow_mut();
        if let Some(old) = slot.as_ref() {
            old.clear();
        }
        *slot = Some(Progress::new_spinner(&format!("{name} {}", self.label)));
    }
}

/// Install one artifact with a branded progress indicator, printing a concise
/// `✓ <tool> <version> → <key>` summary on success.
fn install_with_ui(
    engine: &Engine,
    tool: &str,
    version: &str,
    artifact: &vanta_core::Artifact,
) -> VtaResult<StoreKey> {
    let ui = InstallUi::new(format!("{tool} {version}"));
    let key = engine.install_artifact_reported(tool, version, artifact, &ui)?;
    ui.finish_ok(&format!("{tool} {version} → {key}"));
    Ok(key)
}

/// Dispatch a parsed argv (without the program name). Returns the process exit code.
pub fn run(args: &[String]) -> VtaResult<ExitCode> {
    let cmd = args.first().map(String::as_str).unwrap_or("help");
    let rest: &[String] = args.get(1..).unwrap_or(&[]);
    // Branded wordmark, once, for interactive top-level runs. `banner` itself
    // is a no-op unless stdout is a color-capable TTY, so this never pollutes
    // scriptable/piped output; we additionally skip commands whose output is
    // consumed by machines or shells.
    if wants_banner(cmd) {
        vanta_ui::banner(VERSION);
    }
    match cmd {
        "--version" | "-V" | "version" => {
            println!("vanta {VERSION}");
            Ok(ExitCode::Ok)
        }
        "--help" | "-h" | "help" => {
            print_help();
            Ok(ExitCode::Ok)
        }
        "add" | "install" => cmd_add(rest),
        "search" => cmd_search(rest),
        "info" => cmd_info(rest),
        "activate" => cmd_activate(rest),
        "list" | "ls" => cmd_list(),
        "which" => cmd_which(rest),
        "doctor" => cmd_doctor(),
        "sync" => cmd_sync(),
        "generations" | "gen" => cmd_generations(),
        "rollback" => cmd_rollback(rest),
        "gc" => cmd_gc(),
        "init" | "migrate" => cmd_import(has_flag(rest, "--force") || has_flag(rest, "-f")),
        "exec" => cmd_exec(rest),
        "x" => cmd_x(rest),
        "remove" | "rm" => cmd_remove(rest),
        "run" => cmd_run(rest),
        "bundle" => cmd_bundle(rest),
        "restore" => cmd_restore(rest),
        "use" => cmd_add(rest),
        "update" | "up" => cmd_sync(),
        "outdated" => cmd_outdated(),
        "cache" => cmd_cache(rest),
        "config" => cmd_config(),
        "completions" => cmd_completions(rest),
        "trust" => cmd_trust(rest),
        "registry" => cmd_registry(rest),
        "shell" => cmd_shell(rest),
        "self" => cmd_self(rest),
        other => {
            eprintln!("vanta: unknown command `{other}` (try `vanta help`)");
            Ok(ExitCode::Usage)
        }
    }
}

/// `vanta add <tool>[@version] ...` — resolve and install each tool.
fn cmd_add(rest: &[String]) -> VtaResult<ExitCode> {
    let tools: Vec<&String> = rest.iter().filter(|a| !a.starts_with('-')).collect();
    if tools.is_empty() {
        eprintln!("usage: vanta add <tool>[@version] ...");
        return Ok(ExitCode::Usage);
    }

    let registry = load_registry()?;
    let resolver = Resolver::new(&registry);
    let platform = Platform::current();

    // Resolve everything first (fail fast, no side effects on disk).
    let mut resolutions = Vec::new();
    for tool in &tools {
        let request = Request::parse(tool)?;
        resolutions.push(resolver.resolve(&request, &[platform])?);
    }

    // Install.
    let engine = open_engine()?;
    for resolution in &resolutions {
        let artifact = artifact_for(resolution, &platform).ok_or_else(|| {
            VtaError::new(
                Area::Res,
                5,
                format!(
                    "no artifact for `{}` on {}",
                    resolution.tool,
                    platform.token()
                ),
            )
        })?;
        install_with_ui(&engine, &resolution.tool, &resolution.version, artifact)?;
    }
    Ok(ExitCode::Ok)
}

/// `vanta search <query>` — search the registry.
fn cmd_search(rest: &[String]) -> VtaResult<ExitCode> {
    let query = rest
        .iter()
        .find(|a| !a.starts_with('-'))
        .cloned()
        .unwrap_or_default();
    let registry = load_registry()?;
    for name in registry.search(&query) {
        println!("{name}");
    }
    Ok(ExitCode::Ok)
}

/// `vanta info <tool>` — show a tool's provider and available versions.
fn cmd_info(rest: &[String]) -> VtaResult<ExitCode> {
    let name = match rest.iter().find(|a| !a.starts_with('-')) {
        Some(n) => n,
        None => {
            eprintln!("usage: vanta info <tool>");
            return Ok(ExitCode::Usage);
        }
    };
    let registry = load_registry()?;
    let entry = registry
        .tool(name)
        .ok_or_else(|| VtaError::new(Area::Res, 3, format!("unknown tool `{name}`")))?;
    println!("{name}  (provider: {})", entry.provider.id);
    if let Some(summary) = &entry.summary {
        println!("  {summary}");
    }
    println!("  versions:");
    for v in &entry.versions {
        let chan = v.channel.as_deref().unwrap_or("");
        println!("    {} {}", v.version, chan);
    }
    Ok(ExitCode::Ok)
}

/// `vanta activate <shell>` — print the shell hook for `eval`.
fn cmd_activate(rest: &[String]) -> VtaResult<ExitCode> {
    let shell = match rest.iter().find(|a| !a.starts_with('-')) {
        Some(s) => s,
        None => {
            eprintln!("usage: vanta activate <bash|zsh|fish|pwsh>");
            return Ok(ExitCode::Usage);
        }
    };
    match vanta_env::activate_hook(shell) {
        Some(hook) => {
            print!("{hook}");
            Ok(ExitCode::Ok)
        }
        None => {
            eprintln!("vanta: unsupported shell `{shell}`");
            Ok(ExitCode::Usage)
        }
    }
}

/// `vanta list` — show the tools in the active generation.
fn cmd_list() -> VtaResult<ExitCode> {
    let engine = Engine::open(home()?)?;
    match engine.state().current()? {
        Some(id) => match engine.state().get_generation(id)? {
            Some(gen) if !gen.tools.is_empty() => {
                for (tool, key) in &gen.tools {
                    println!("{tool}  ({key})");
                }
            }
            _ => println!("(no tools installed)"),
        },
        None => println!("(no tools installed)"),
    }
    Ok(ExitCode::Ok)
}

/// `vanta which <tool>` — print the store path of the active tool.
fn cmd_which(rest: &[String]) -> VtaResult<ExitCode> {
    let name = match rest.iter().find(|a| !a.starts_with('-')) {
        Some(n) => n,
        None => {
            eprintln!("usage: vanta which <tool>");
            return Ok(ExitCode::Usage);
        }
    };
    let engine = Engine::open(home()?)?;
    let id = engine
        .state()
        .current()?
        .ok_or_else(|| VtaError::new(Area::Env, 2, format!("`{name}` is not active")))?;
    let gen = engine
        .state()
        .get_generation(id)?
        .ok_or_else(|| VtaError::new(Area::Env, 2, format!("`{name}` is not active")))?;
    let (_, key) = gen
        .tools
        .iter()
        .find(|(t, _)| t == name)
        .ok_or_else(|| VtaError::new(Area::Env, 2, format!("`{name}` is not active")))?;
    let store_key = StoreKey::new(key.clone())?;
    println!("{}", engine.store().entry_path(&store_key).display());
    Ok(ExitCode::Ok)
}

/// `vanta generations` — list the generation history (`*` marks the active one).
fn cmd_generations() -> VtaResult<ExitCode> {
    let engine = Engine::open(home()?)?;
    match engine.state().current()? {
        None => println!("(no generations)"),
        Some(current) => {
            for id in 1..=current {
                if let Some(gen) = engine.state().get_generation(id)? {
                    let mark = if id == current { "*" } else { " " };
                    println!("{mark} {id:04}  {}  [{}]", gen.command, gen.reason);
                }
            }
        }
    }
    Ok(ExitCode::Ok)
}

/// `vanta rollback [gen]` — switch the active generation (defaults to the previous).
fn cmd_rollback(rest: &[String]) -> VtaResult<ExitCode> {
    let engine = Engine::open(home()?)?;
    let current = engine
        .state()
        .current()?
        .ok_or_else(|| VtaError::new(Area::Env, 2, "no generations to roll back".to_string()))?;
    let target = match rest
        .iter()
        .find(|a| !a.starts_with('-'))
        .and_then(|s| s.parse::<u64>().ok())
    {
        Some(n) => n,
        None if current > 1 => current - 1,
        None => {
            return Err(VtaError::new(
                Area::Env,
                2,
                "already at the earliest generation".to_string(),
            ))
        }
    };
    if engine.state().get_generation(target)?.is_none() {
        return Err(VtaError::new(
            Area::Env,
            2,
            format!("generation {target} not found"),
        ));
    }
    engine.state().set_current(target)?;
    println!("rolled back to generation {target:04}");
    Ok(ExitCode::Ok)
}

/// `vanta gc` — remove store entries unreachable from the retained generations
/// (the active one plus the previous few, per the retention policy).
fn cmd_gc() -> VtaResult<ExitCode> {
    const RETAIN: u64 = 5;
    let engine = Engine::open(home()?)?;
    let mut roots: HashSet<StoreKey> = HashSet::new();
    if let Some(current) = engine.state().current()? {
        let start = current.saturating_sub(RETAIN - 1).max(1);
        for id in start..=current {
            if let Some(gen) = engine.state().get_generation(id)? {
                for (_, key) in &gen.tools {
                    if let Ok(k) = StoreKey::new(key.clone()) {
                        roots.insert(k);
                    }
                }
            }
        }
    }
    let removed = engine.store().gc(&roots)?;
    println!(
        "removed {removed} unreferenced store entr{}",
        if removed == 1 { "y" } else { "ies" }
    );
    Ok(ExitCode::Ok)
}

/// `vanta doctor` — run health checks and print fixes.
fn cmd_doctor() -> VtaResult<ExitCode> {
    let home = home()?;
    let checks = vanta_diag::run(&home);
    for c in &checks {
        let mark = if c.ok { "✓" } else { "✗" };
        println!("{mark} {} — {}", c.name, c.detail);
    }
    Ok(if vanta_diag::all_ok(&checks) {
        ExitCode::Ok
    } else {
        ExitCode::Failure
    })
}

/// `vanta sync` — reconcile to the nearest `vanta.toml`: install each tool for the
/// current platform and write a **cross-platform** `vanta.lock` pinning every
/// declared target the registry can serve (`docs/11-reproducibility.md`).
fn cmd_sync() -> VtaResult<ExitCode> {
    let manifest_path = find_manifest()?;
    // M9: syncing executes a manifest's declared tool set; gate it on the trust
    // list (TOFU) so a freshly-cloned, untrusted manifest cannot silently drive
    // installs.
    if !ensure_manifest_trusted(&manifest_path)? {
        return Ok(ExitCode::Usage);
    }
    let manifest = vanta_config::load_file(&manifest_path)?;
    if manifest.tools.is_empty() {
        println!(
            "nothing to sync ({} has no [tools])",
            manifest_path.display()
        );
        return Ok(ExitCode::Ok);
    }

    // Target platforms: the manifest's `[settings] targets`, else a default set;
    // always include the current platform so this machine can install.
    let current = Platform::current();
    let mut platforms: Vec<Platform> = manifest
        .settings
        .targets
        .clone()
        .unwrap_or_else(default_targets)
        .iter()
        .filter_map(|t| Platform::parse(t).ok())
        .collect();
    if !platforms.contains(&current) {
        platforms.push(current);
    }

    let registry = load_registry()?;
    let resolver = Resolver::new(&registry);
    let engine = open_engine()?;
    let mut lock = vanta_lock::Lock::new(
        format!("vanta {VERSION}"),
        platforms.iter().map(|p| p.token()).collect(),
    );

    for (tool, spec) in &manifest.tools {
        let request_str = spec.version().to_string();
        let request = Request {
            tool: tool.clone(),
            version: VersionReq::parse(&request_str),
        };
        let resolution = resolver.resolve(&request, &platforms)?;

        // Install only the current platform; lock pins all resolved platforms.
        let current_artifact = artifact_for(&resolution, &current).ok_or_else(|| {
            VtaError::new(
                Area::Res,
                5,
                format!("no artifact for `{tool}` on {}", current.token()),
            )
        })?;
        let key = install_with_ui(
            &engine,
            &resolution.tool,
            &resolution.version,
            current_artifact,
        )?;

        let mut platform_map = BTreeMap::new();
        for (plat, art) in &resolution.per_platform {
            // Materialized only for the current platform; others pin url+hash and
            // get a store key when that platform later syncs.
            let store_key = if *plat == current {
                key.as_str().to_string()
            } else {
                String::new()
            };
            platform_map.insert(
                plat.token(),
                vanta_lock::PlatformPin {
                    store_key,
                    url: art.url.clone(),
                    size: art.size,
                    sha256: art.checksum.value.clone(),
                    blake3: None,
                    signature: art.signature.clone(),
                    bin: art.bin.clone(),
                },
            );
        }
        lock.tools.push(vanta_lock::LockedTool {
            name: tool.clone(),
            request: request_str,
            version: resolution.version.clone(),
            provider: resolution.provider.clone(),
            platform: platform_map,
        });
    }

    let lock_path = manifest_path
        .parent()
        .unwrap_or(Path::new("."))
        .join("vanta.lock");
    lock.write_file(&lock_path)?;
    println!(
        "✓ wrote {} ({} targets)",
        lock_path.display(),
        platforms.len()
    );
    Ok(ExitCode::Ok)
}

/// The default lock target set when a manifest declares none.
fn default_targets() -> Vec<String> {
    [
        "macos/aarch64",
        "macos/x86_64",
        "linux/x86_64/gnu",
        "linux/aarch64/gnu",
        "windows/x86_64",
    ]
    .iter()
    .map(|s| s.to_string())
    .collect()
}

/// Find the nearest `vanta.toml`, walking up from the current directory.
fn find_manifest() -> VtaResult<PathBuf> {
    let mut dir = std::env::current_dir()
        .map_err(|e| VtaError::new(Area::Cfg, 1, format!("cannot read current directory: {e}")))?;
    loop {
        let candidate = dir.join("vanta.toml");
        if candidate.is_file() {
            return Ok(candidate);
        }
        if !dir.pop() {
            return Err(VtaError::new(
                Area::Cfg,
                1,
                "no vanta.toml found in this directory or any parent".to_string(),
            ));
        }
    }
}

/// `vanta exec -- <cmd>` — run a command with `~/.vanta/bin` on PATH.
fn cmd_exec(rest: &[String]) -> VtaResult<ExitCode> {
    let cmdv: &[String] = match rest.iter().position(|a| a == "--") {
        Some(i) => &rest[i + 1..],
        None => rest,
    };
    if cmdv.is_empty() {
        eprintln!("usage: vanta exec -- <command> [args]");
        return Ok(ExitCode::Usage);
    }
    run_header(&cmdv[0], &cmdv[1..]);
    let status = Command::new(&cmdv[0])
        .args(&cmdv[1..])
        .env("PATH", env_path_with_bin()?)
        .status()
        .map_err(|e| VtaError::new(Area::Env, 1, format!("running {}: {e}", cmdv[0])))?;
    Ok(status_exit(status))
}

/// `vanta x <tool>[@ver] [args]` — resolve+install if needed, then run it.
fn cmd_x(rest: &[String]) -> VtaResult<ExitCode> {
    let spec = match rest.iter().find(|a| !a.starts_with('-')) {
        Some(s) => s.clone(),
        None => {
            eprintln!("usage: vanta x <tool>[@version] [args]");
            return Ok(ExitCode::Usage);
        }
    };
    let request = Request::parse(&spec)?;
    let registry = load_registry()?;
    let resolver = Resolver::new(&registry);
    let platform = Platform::current();
    let resolution = resolver.resolve(&request, &[platform])?;
    let engine = open_engine()?;
    let artifact = artifact_for(&resolution, &platform).ok_or_else(|| {
        VtaError::new(
            Area::Res,
            5,
            format!("no artifact for `{}`", resolution.tool),
        )
    })?;
    install_with_ui(&engine, &resolution.tool, &resolution.version, artifact)?;

    let idx = rest.iter().position(|a| a == &spec).unwrap_or(0);
    let args: &[String] = rest.get(idx + 1..).unwrap_or(&[]);
    let tool_bin = home()?.join("bin").join(&resolution.tool);
    run_header(&resolution.tool, args);
    let status = Command::new(&tool_bin)
        .args(args)
        .env("PATH", env_path_with_bin()?)
        .status()
        .map_err(|e| VtaError::new(Area::Env, 1, format!("running {}: {e}", resolution.tool)))?;
    Ok(status_exit(status))
}

/// `vanta remove <tool>` — drop a tool (new generation) and unlink it.
fn cmd_remove(rest: &[String]) -> VtaResult<ExitCode> {
    let tool = match rest.iter().find(|a| !a.starts_with('-')) {
        Some(t) => t,
        None => {
            eprintln!("usage: vanta remove <tool>");
            return Ok(ExitCode::Usage);
        }
    };
    let engine = Engine::open(home()?)?;
    if engine.remove(tool)? {
        println!("removed {tool}");
        Ok(ExitCode::Ok)
    } else {
        Err(VtaError::new(
            Area::Env,
            2,
            format!("`{tool}` is not installed"),
        ))
    }
}

/// `vanta run <task|tool> [args]` — run a manifest task, else a tool binary.
fn cmd_run(rest: &[String]) -> VtaResult<ExitCode> {
    let name = match rest.iter().find(|a| !a.starts_with('-')) {
        Some(n) => n.clone(),
        None => {
            eprintln!("usage: vanta run <task|tool> [args]");
            return Ok(ExitCode::Usage);
        }
    };
    // A defined task wins over a tool of the same name.
    if let Ok(manifest_path) = find_manifest() {
        if let Ok(manifest) = vanta_config::load_file(&manifest_path) {
            if let Some(task) = manifest.tasks.get(&name) {
                // M9: a manifest task runs an arbitrary shell command. Refuse to
                // run it from an untrusted manifest (a hostile cloned repo) until
                // the operator trusts it.
                if !ensure_manifest_trusted(&manifest_path)? {
                    return Ok(ExitCode::Usage);
                }
                let cmd = match task {
                    vanta_config::model::Task::Command(s) => s.clone(),
                    vanta_config::model::Task::Detailed(d) => d.run.clone(),
                };
                vanta_ui::running(&cmd);
                let status = shell_command(&cmd)
                    .env("PATH", env_path_with_bin()?)
                    .status()
                    .map_err(|e| {
                        VtaError::new(Area::Env, 1, format!("running task `{name}`: {e}"))
                    })?;
                return Ok(status_exit(status));
            }
        }
    }
    let idx = rest.iter().position(|a| a == &name).unwrap_or(0);
    let args: &[String] = rest.get(idx + 1..).unwrap_or(&[]);
    let tool_bin = home()?.join("bin").join(&name);
    run_header(&name, args);
    let status = Command::new(&tool_bin)
        .args(args)
        .env("PATH", env_path_with_bin()?)
        .status()
        .map_err(|e| VtaError::new(Area::Env, 1, format!("running `{name}`: {e}")))?;
    Ok(status_exit(status))
}

/// `vanta bundle [--out file]` — pack the active generation for offline transfer.
fn cmd_bundle(rest: &[String]) -> VtaResult<ExitCode> {
    let out = rest
        .iter()
        .position(|a| a == "--out")
        .and_then(|i| rest.get(i + 1))
        .cloned()
        .unwrap_or_else(|| "vanta-bundle.vbundle".to_string());
    let engine = Engine::open(home()?)?;
    let progress = Progress::new_spinner(&format!("bundling active generation → {out}"));
    let n = match engine.bundle_current(Path::new(&out)) {
        Ok(n) => n,
        Err(e) => {
            progress.finish_err("bundle failed");
            return Err(e);
        }
    };
    progress.finish_ok(&format!("bundled {n} store entries → {out}"));
    Ok(ExitCode::Ok)
}

/// `vanta restore <file>` — import a bundle (verifying integrity).
fn cmd_restore(rest: &[String]) -> VtaResult<ExitCode> {
    let file = match rest.iter().find(|a| !a.starts_with('-')) {
        Some(f) => f,
        None => {
            eprintln!("usage: vanta restore <file>");
            return Ok(ExitCode::Usage);
        }
    };
    let engine = Engine::open(home()?)?;
    let progress = Progress::new_spinner(&format!("restoring bundle {file}"));
    let n = match engine.restore(Path::new(file)) {
        Ok(n) => n,
        Err(e) => {
            progress.finish_err("restore failed");
            return Err(e);
        }
    };
    progress.finish_ok(&format!("restored {n} store entries"));
    Ok(ExitCode::Ok)
}

/// `vanta outdated` — show current (locked) vs allowed vs latest per manifest tool.
#[allow(clippy::print_literal)] // aligned header columns read clearer as args
fn cmd_outdated() -> VtaResult<ExitCode> {
    let manifest_path = find_manifest()?;
    let manifest = vanta_config::load_file(&manifest_path)?;
    let registry = load_registry()?;
    let resolver = Resolver::new(&registry);
    let platform = Platform::current();

    let lock_path = manifest_path
        .parent()
        .unwrap_or(Path::new("."))
        .join("vanta.lock");
    let locked: BTreeMap<String, String> = if lock_path.exists() {
        vanta_lock::Lock::load_file(&lock_path)
            .map(|l| l.tools.into_iter().map(|t| (t.name, t.version)).collect())
            .unwrap_or_default()
    } else {
        BTreeMap::new()
    };

    println!(
        "{:<16} {:<12} {:<12} {}",
        "tool", "current", "allowed", "latest"
    );
    for (tool, spec) in &manifest.tools {
        let allowed = resolver
            .resolve(
                &Request {
                    tool: tool.clone(),
                    version: VersionReq::parse(spec.version()),
                },
                &[platform],
            )
            .map(|r| r.version)
            .unwrap_or_else(|_| "-".to_string());
        let latest = resolver
            .resolve(
                &Request {
                    tool: tool.clone(),
                    version: VersionReq::Latest,
                },
                &[platform],
            )
            .map(|r| r.version)
            .unwrap_or_else(|_| "-".to_string());
        let current = locked.get(tool).cloned().unwrap_or_else(|| "-".to_string());
        println!("{tool:<16} {current:<12} {allowed:<12} {latest}");
    }
    Ok(ExitCode::Ok)
}

/// `vanta cache <stats|prune>` — inspect or clear the download cache.
fn cmd_cache(rest: &[String]) -> VtaResult<ExitCode> {
    let sub = rest
        .iter()
        .find(|a| !a.starts_with('-'))
        .map(|s| s.as_str())
        .unwrap_or("stats");
    let downloads = home()?.join("cache").join("downloads");
    match sub {
        "prune" => {
            let mut n = 0;
            if let Ok(rd) = std::fs::read_dir(&downloads) {
                for e in rd.flatten() {
                    if std::fs::remove_file(e.path()).is_ok() {
                        n += 1;
                    }
                }
            }
            println!("pruned {n} cached downloads");
        }
        _ => {
            let (mut files, mut bytes) = (0u64, 0u64);
            if let Ok(rd) = std::fs::read_dir(&downloads) {
                for e in rd.flatten() {
                    if let Ok(m) = e.metadata() {
                        if m.is_file() {
                            files += 1;
                            bytes += m.len();
                        }
                    }
                }
            }
            println!("download cache: {files} files, {} KB", bytes / 1024);
        }
    }
    Ok(ExitCode::Ok)
}

/// `vanta config` — show the global config path and contents.
fn cmd_config() -> VtaResult<ExitCode> {
    let path = home()?.join("config.toml");
    println!("config: {}", path.display());
    match std::fs::read_to_string(&path) {
        Ok(contents) => {
            println!("---");
            print!("{contents}");
        }
        Err(_) => println!("(no global config; create it to set [tools]/[settings])"),
    }
    Ok(ExitCode::Ok)
}

/// `vanta completions <shell>` — emit a basic completion script.
fn cmd_completions(rest: &[String]) -> VtaResult<ExitCode> {
    let shell = rest
        .iter()
        .find(|a| !a.starts_with('-'))
        .map(|s| s.as_str())
        .unwrap_or("bash");
    let cmds = "add remove update sync list which search info outdated init migrate doctor activate gc rollback generations run exec x bundle restore cache config completions use";
    match shell {
        "bash" => println!("complete -W \"{cmds}\" vanta vt"),
        "zsh" => println!("#compdef vanta vt\n_values 'vanta command' {cmds}"),
        "fish" => {
            for c in cmds.split(' ') {
                println!("complete -c vanta -a {c}");
            }
        }
        other => {
            eprintln!("vanta: no completions for `{other}`");
            return Ok(ExitCode::Usage);
        }
    }
    Ok(ExitCode::Ok)
}

/// `vanta trust [path]` — record a manifest's content hash as trusted (TOFU).
fn cmd_trust(rest: &[String]) -> VtaResult<ExitCode> {
    let trust_dir = home()?.join("trust");
    if has_flag(rest, "--list") {
        match std::fs::read_dir(&trust_dir) {
            Ok(rd) => {
                for e in rd.flatten() {
                    if let Ok(target) = std::fs::read_to_string(e.path()) {
                        println!("{}  {}", e.file_name().to_string_lossy(), target);
                    }
                }
            }
            Err(_) => println!("(nothing trusted yet)"),
        }
        return Ok(ExitCode::Ok);
    }
    let path = match rest.iter().find(|a| !a.starts_with('-')) {
        Some(p) => PathBuf::from(p),
        None => find_manifest()?,
    };
    let hash = vanta_security::sha256_file(&path)?;
    std::fs::create_dir_all(&trust_dir)
        .map_err(|e| VtaError::new(Area::Vrf, 3, format!("trust dir: {e}")))?;
    std::fs::write(trust_dir.join(&hash), path.display().to_string())
        .map_err(|e| VtaError::new(Area::Vrf, 3, format!("recording trust: {e}")))?;
    println!("trusted {} ({hash})", path.display());
    Ok(ExitCode::Ok)
}

/// Whether a manifest's content hash has been recorded as trusted (TOFU).
fn manifest_is_trusted(trust_dir: &Path, hash: &str) -> bool {
    trust_dir.join(hash).is_file()
}

/// Gate execution on the trust list (audit M9). Returns `Ok(true)` if the
/// manifest is trusted (or the operator approves), `Ok(false)` to refuse.
///
/// Policy: already-trusted manifests pass silently. An untrusted manifest is
/// **refused** in a non-interactive context (fail-closed) and **prompted** when
/// stdin is a terminal; on a "yes" reply it is recorded as trusted and allowed.
/// `VANTA_ASSUME_TRUST=1` approves non-interactively (for CI that opts in).
fn ensure_manifest_trusted(manifest_path: &Path) -> VtaResult<bool> {
    use std::io::IsTerminal;
    let trust_dir = home()?.join("trust");
    let hash = vanta_security::sha256_file(manifest_path)?;
    if manifest_is_trusted(&trust_dir, &hash) {
        return Ok(true);
    }
    let assume = matches!(
        std::env::var("VANTA_ASSUME_TRUST").ok().as_deref(),
        Some("1") | Some("true") | Some("yes")
    );
    let approved = if assume {
        true
    } else if std::io::stdin().is_terminal() {
        eprint!(
            "vanta: {} is not trusted. Trust it and continue? [y/N] ",
            manifest_path.display()
        );
        use std::io::Write;
        let _ = std::io::stderr().flush();
        let mut line = String::new();
        std::io::stdin().read_line(&mut line).ok();
        matches!(line.trim().to_ascii_lowercase().as_str(), "y" | "yes")
    } else {
        false
    };
    if approved {
        std::fs::create_dir_all(&trust_dir)
            .map_err(|e| VtaError::new(Area::Vrf, 3, format!("trust dir: {e}")))?;
        let _ = std::fs::write(trust_dir.join(&hash), manifest_path.display().to_string());
        Ok(true)
    } else {
        eprintln!(
            "vanta: refusing to use untrusted manifest {} \
             (run `vanta trust` to approve it)",
            manifest_path.display()
        );
        Ok(false)
    }
}

/// `vanta registry <list|add <name> <url>>` — manage configured registries.
fn cmd_registry(rest: &[String]) -> VtaResult<ExitCode> {
    let nonflags: Vec<&String> = rest.iter().filter(|a| !a.starts_with('-')).collect();
    let cfg = home()?.join("config.toml");
    match nonflags.first().map(|s| s.as_str()) {
        Some("add") => {
            if nonflags.len() < 3 {
                eprintln!("usage: vanta registry add <name> <url>");
                return Ok(ExitCode::Usage);
            }
            let (name, url) = (nonflags[1], nonflags[2]);
            let block = format!("\n[registries.{name}]\nurl = \"{url}\"\n");
            if let Some(parent) = cfg.parent() {
                let _ = std::fs::create_dir_all(parent);
            }
            let mut existing = std::fs::read_to_string(&cfg).unwrap_or_default();
            existing.push_str(&block);
            std::fs::write(&cfg, existing)
                .map_err(|e| VtaError::new(Area::Cfg, 1, format!("writing config: {e}")))?;
            println!("added registry {name} → {url}");
            Ok(ExitCode::Ok)
        }
        _ => {
            if cfg.exists() {
                let manifest = vanta_config::load_file(&cfg)?;
                if manifest.registries.is_empty() {
                    println!("(no registries configured; the official registry is used)");
                } else {
                    for (name, reg) in &manifest.registries {
                        println!("{name}  {}", reg.url);
                    }
                }
            } else {
                println!("(no config; the official registry is used by default)");
            }
            Ok(ExitCode::Ok)
        }
    }
}

/// `vanta shell <tool>@<ver> ...` — install (if needed) and start a subshell with
/// the tools on PATH.
fn cmd_shell(rest: &[String]) -> VtaResult<ExitCode> {
    let specs: Vec<&String> = rest.iter().filter(|a| !a.starts_with('-')).collect();
    if specs.is_empty() {
        eprintln!("usage: vanta shell <tool>[@version] ...");
        return Ok(ExitCode::Usage);
    }
    let registry = load_registry()?;
    let resolver = Resolver::new(&registry);
    let platform = Platform::current();
    let engine = open_engine()?;
    for spec in &specs {
        let request = Request::parse(spec)?;
        let resolution = resolver.resolve(&request, &[platform])?;
        let artifact = artifact_for(&resolution, &platform).ok_or_else(|| {
            VtaError::new(
                Area::Res,
                5,
                format!("no artifact for `{}`", resolution.tool),
            )
        })?;
        install_with_ui(&engine, &resolution.tool, &resolution.version, artifact)?;
    }
    let shell = std::env::var("SHELL").unwrap_or_else(|_| {
        if cfg!(windows) {
            "cmd".to_string()
        } else {
            "/bin/sh".to_string()
        }
    });
    vanta_ui::running(&format!(
        "{shell} (vanta subshell with {} tool(s); type `exit` to leave)",
        specs.len()
    ));
    let status = Command::new(shell)
        .env("PATH", env_path_with_bin()?)
        .status()
        .map_err(|e| VtaError::new(Area::Env, 1, format!("starting subshell: {e}")))?;
    Ok(status_exit(status))
}

/// `vanta self <uninstall|update>` — manage the Vanta installation itself.
fn cmd_self(rest: &[String]) -> VtaResult<ExitCode> {
    match rest
        .iter()
        .find(|a| !a.starts_with('-'))
        .map(|s| s.as_str())
    {
        Some("uninstall") => {
            let h = home()?;
            if !has_flag(rest, "--yes") {
                eprintln!(
                    "this will permanently remove {} — re-run with --yes",
                    h.display()
                );
                return Ok(ExitCode::Usage);
            }
            std::fs::remove_dir_all(&h).map_err(|e| {
                VtaError::new(Area::Sys, 2, format!("removing {}: {e}", h.display()))
            })?;
            println!("removed {}", h.display());
            Ok(ExitCode::Ok)
        }
        Some("update") => {
            println!(
                "self-update is handled by the channel you installed from; \
                 see docs/32-release-engineering.md"
            );
            Ok(ExitCode::Ok)
        }
        _ => {
            eprintln!("usage: vanta self <uninstall|update>");
            Ok(ExitCode::Usage)
        }
    }
}

fn env_path_with_bin() -> VtaResult<String> {
    let bin = home()?.join("bin");
    let sep = if cfg!(windows) { ';' } else { ':' };
    Ok(format!(
        "{}{}{}",
        bin.display(),
        sep,
        std::env::var("PATH").unwrap_or_default()
    ))
}

/// Print a single branded header line before a subprocess inherits stdio.
/// Written to stderr so the child's own stdout stays unpolluted.
fn run_header(program: &str, args: &[String]) {
    let mut line = program.to_string();
    if !args.is_empty() {
        line.push(' ');
        line.push_str(&args.join(" "));
    }
    vanta_ui::running(&line);
}

fn shell_command(cmd: &str) -> Command {
    if cfg!(windows) {
        let mut c = Command::new("cmd");
        c.arg("/C").arg(cmd);
        c
    } else {
        let mut c = Command::new("sh");
        c.arg("-c").arg(cmd);
        c
    }
}

fn status_exit(status: std::process::ExitStatus) -> ExitCode {
    if status.success() {
        ExitCode::Ok
    } else {
        ExitCode::Failure
    }
}

/// `vanta init` / `vanta migrate` — detect foreign version files and write a
/// `vanta.toml` (`docs/30-migration.md`).
fn cmd_import(force: bool) -> VtaResult<ExitCode> {
    let cwd = std::env::current_dir()
        .map_err(|e| VtaError::new(Area::Cfg, 1, format!("cannot read current directory: {e}")))?;
    let imported = vanta_migrate::import_dir(&cwd);
    if imported.is_empty() {
        println!("no version files detected in {}", cwd.display());
        return Ok(ExitCode::Ok);
    }
    let target = cwd.join("vanta.toml");
    if target.exists() && !force {
        eprintln!("vanta.toml already exists (use --force to overwrite)");
        return Ok(ExitCode::Usage);
    }
    println!("detected:");
    for i in &imported {
        println!("  {} = \"{}\"  (from {})", i.tool, i.version, i.source);
    }
    let body = vanta_migrate::to_manifest_toml(&imported);
    std::fs::write(&target, body)
        .map_err(|e| VtaError::new(Area::Cfg, 1, format!("writing {}: {e}", target.display())))?;
    println!(
        "✓ wrote {} — run `vanta sync` to install + lock",
        target.display()
    );
    Ok(ExitCode::Ok)
}

fn has_flag(rest: &[String], flag: &str) -> bool {
    rest.iter().any(|a| a == flag)
}

/// Whether to show the wordmark banner for `cmd`. Suppressed for machine- or
/// shell-consumed commands whose output must stay clean (versions, help text,
/// completion scripts, the `activate` shell hook, `which` paths, and the
/// `exec` passthrough), even on a TTY. Other commands still only render the
/// banner when [`vanta_ui::banner`] decides the terminal is interactive.
fn wants_banner(cmd: &str) -> bool {
    !matches!(
        cmd,
        "--version"
            | "-V"
            | "version"
            | "--help"
            | "-h"
            | "help"
            | "completions"
            | "activate"
            | "which"
            | "exec"
    )
}

/// Resolve `$VANTA_HOME` (or `~/.vanta`).
fn home() -> VtaResult<PathBuf> {
    if let Ok(h) = std::env::var("VANTA_HOME") {
        return Ok(PathBuf::from(h));
    }
    let base = std::env::var("HOME")
        .or_else(|_| std::env::var("USERPROFILE"))
        .map_err(|_| {
            VtaError::new(
                Area::Sys,
                2,
                "cannot determine home directory; set VANTA_HOME".to_string(),
            )
        })?;
    Ok(PathBuf::from(base).join(".vanta"))
}

/// Hard ceiling on the registry index download (defense against an oversized
/// index served by a hostile endpoint).
const REGISTRY_MAX_BYTES: u64 = 64 * 1024 * 1024; // 64 MiB

/// The official, root-signed registry served from the project repository. Used
/// when `$VANTA_REGISTRY` is unset; fetched and verified over the same
/// pinned-root path as any other network registry (audit C1). Override with
/// `$VANTA_REGISTRY` (an `https://` URL or a local file path).
const DEFAULT_REGISTRY_URL: &str =
    "https://raw.githubusercontent.com/squaretick/vanta/main/registry/registry.toml";

/// Whether the operator has explicitly opted into insecure registry handling
/// (`VANTA_INSECURE_REGISTRY=1`). DANGEROUS: this disables both the HTTPS
/// requirement and the pinned-root signature requirement on a network registry,
/// reducing the index to its (attacker-influenceable) contents. Per-artifact
/// signing keys are still treated as unverified unless individually pinned.
fn registry_insecure_optin() -> bool {
    matches!(
        std::env::var("VANTA_INSECURE_REGISTRY").ok().as_deref(),
        Some("1") | Some("true") | Some("yes")
    )
}

/// Load the registry (audit C1: pinned-root trust model).
///
/// * A network (`$VANTA_REGISTRY`) index must be served over `https` and must
///   carry a detached signature (`<url>.minisig`) that verifies against a pinned
///   root key (compiled-in or `~/.vanta/trust/roots.toml`). On success the index
///   is marked verified so the resolver may trust the per-tool signing keys it
///   carries (transitive trust). Both requirements can be waived only via the
///   documented, dangerous `VANTA_INSECURE_REGISTRY` opt-in.
/// * A local-file index (`$VANTA_REGISTRY=/path`) is user-owned and treated as
///   trusted.
/// * With no `$VANTA_REGISTRY`, the official [`DEFAULT_REGISTRY_URL`] is fetched
///   and verified over the same pinned-root path; only if it cannot be
///   reached/verified do we fall back to the empty built-in index.
fn load_registry() -> VtaResult<Registry> {
    let roots = vanta_security::trust::load_root_keys(&home()?.join("trust"));
    match std::env::var("VANTA_REGISTRY") {
        Ok(loc) if loc.starts_with("http://") || loc.starts_with("https://") => {
            fetch_signed_index(&loc, roots)
        }
        Ok(path) => {
            // A local, user-owned index is trusted (the operator chose it).
            let mut registry = Registry::load_file(Path::new(&path))?;
            registry.index_verified = true;
            registry.trusted_root_keys = roots;
            Ok(registry)
        }
        Err(_) => {
            // No override: use the official, root-signed registry over the same
            // verified-network path. If it cannot be reached/verified, fall back
            // to the (empty) built-in index with an actionable error so offline
            // use still works rather than hard-failing every command.
            match fetch_signed_index(DEFAULT_REGISTRY_URL, roots) {
                Ok(registry) => Ok(registry),
                Err(e) => {
                    eprintln!(
                        "vanta: WARNING — could not load the official registry \
                         ({DEFAULT_REGISTRY_URL}): {e}. Falling back to the empty \
                         built-in index. Set $VANTA_REGISTRY to a reachable signed \
                         https URL or a local file path to override."
                    );
                    Ok(Registry::builtin())
                }
            }
        }
    }
}

/// Fetch a network registry index and authenticate it against the pinned trust
/// roots before returning it (audit C1). Shared by the explicit
/// `$VANTA_REGISTRY=https://…` path and the built-in [`DEFAULT_REGISTRY_URL`].
fn fetch_signed_index(loc: &str, roots: Vec<String>) -> VtaResult<Registry> {
    let insecure = registry_insecure_optin();
    if loc.starts_with("http://") && !insecure {
        return Err(VtaError::new(
            Area::Reg,
            5,
            format!(
                "refusing plaintext http registry {loc} (https required; \
                 set VANTA_INSECURE_REGISTRY=1 to override — DANGEROUS)"
            ),
        ));
    }
    let downloader = if insecure {
        vanta_net::Downloader::insecure()?
    } else {
        vanta_net::Downloader::new()?
    };
    let pid = std::process::id();
    let tmp = std::env::temp_dir().join(format!("vanta-registry-{pid}.toml"));
    // The index length is not declared up front, so this renders as a
    // byte-counting spinner rather than a determinate bar.
    let progress = Progress::new_bar("fetching registry index", None);
    let dl = downloader.download_capped_with_progress(
        loc,
        &tmp,
        Some(REGISTRY_MAX_BYTES),
        Some(&|n| progress.inc(n)),
    );
    if let Err(e) = dl {
        progress.finish_err("registry index download failed");
        return Err(e);
    }
    progress.finish_ok("fetched registry index");
    let index_bytes = std::fs::read(&tmp)
        .map_err(|e| VtaError::new(Area::Reg, 1, format!("reading index: {e}")))?;

    // Authenticate the index against a pinned root before trusting it.
    let sig_url = format!("{loc}.minisig");
    let sig_tmp = std::env::temp_dir().join(format!("vanta-registry-{pid}.minisig"));
    let signature = downloader
        .download_capped(&sig_url, &sig_tmp, Some(1024 * 1024))
        .ok()
        .and_then(|_| std::fs::read_to_string(&sig_tmp).ok());
    let _ = std::fs::remove_file(&sig_tmp);
    let index_verified = signature
        .as_deref()
        .map(|s| vanta_security::trust::index_signed_by_root(&index_bytes, s, &roots))
        .unwrap_or(false);

    if !index_verified && !insecure {
        let _ = std::fs::remove_file(&tmp);
        return Err(VtaError::new(
            Area::Reg,
            6,
            format!(
                "registry index {loc} is not signed by a pinned trust root \
                 (expected detached signature at {loc}.minisig). Refusing to trust it. \
                 Add a root to ~/.vanta/trust/roots.toml, or set \
                 VANTA_INSECURE_REGISTRY=1 to override — DANGEROUS."
            ),
        ));
    }
    if insecure && !index_verified {
        eprintln!(
            "vanta: WARNING — using unverified registry {loc} (VANTA_INSECURE_REGISTRY). \
             Per-artifact signing keys will be treated as untrusted."
        );
    }

    let src = String::from_utf8(index_bytes)
        .map_err(|e| VtaError::new(Area::Reg, 2, format!("index is not UTF-8: {e}")))?;
    let _ = std::fs::remove_file(&tmp);
    let mut registry = Registry::from_toml(&src)?;
    registry.index_verified = index_verified;
    registry.trusted_root_keys = roots;
    Ok(registry)
}

/// Build the install [`Policy`] from configuration (audit H2). Reads
/// `settings.verify` from the global `~/.vanta/config.toml` and, if present, the
/// nearest project manifest (project wins). `verify = "require"` (and synonyms)
/// makes a missing/untrusted signature a hard error. The default (no setting)
/// stays backward-compatible: checksum-gated, signatures verified when present.
fn install_policy() -> vanta_security::Policy {
    let mut policy = vanta_security::Policy::default();
    let mut verify: Option<String> = None;
    if let Ok(h) = home() {
        if let Ok(m) = vanta_config::load_file(&h.join("config.toml")) {
            verify = m.settings.verify;
        }
    }
    if let Ok(path) = find_manifest() {
        if let Ok(m) = vanta_config::load_file(&path) {
            if m.settings.verify.is_some() {
                verify = m.settings.verify;
            }
        }
    }
    if let Some(v) = verify {
        if matches!(
            v.to_ascii_lowercase().as_str(),
            "require" | "required" | "signature" | "strict"
        ) {
            policy.require_signature = true;
        }
    }
    policy
}

/// Open the install engine wired with the configured verification policy.
fn open_engine() -> VtaResult<Engine> {
    Engine::open_with_policy(home()?, install_policy())
}

fn print_help() {
    println!(
        "vanta — every developer tool, one command\n\
         \n\
         USAGE:\n    vanta <command> [args]\n\
         \n\
         COMMON COMMANDS:\n\
         \x20   add <tool>[@ver]    resolve and install a tool (alias: install)\n\
         \x20   search <query>      search the registry\n\
         \x20   info <tool>         show a tool's versions\n\
         \x20   remove <tool>       remove a tool\n\
         \x20   update [tool]       update within constraints\n\
         \x20   sync                reconcile to vanta.toml + vanta.lock\n\
         \x20   doctor              diagnose the installation\n\
         \n\
         REGISTRY:\n\
         \x20   By default vanta uses the official, minisign-signed registry\n\
         \x20   (verified against a pinned root key). Override the source with\n\
         \x20   $VANTA_REGISTRY — an https:// URL (must carry a <url>.minisig\n\
         \x20   signed by a pinned root) or a local file path (trusted as-is).\n\
         \n\
         See docs/04-cli.md for the full reference."
    );
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn version_ok() {
        assert_eq!(run(&["--version".into()]).unwrap(), ExitCode::Ok);
    }

    #[test]
    fn unknown_is_usage() {
        assert_eq!(run(&["frobnicate".into()]).unwrap(), ExitCode::Usage);
    }

    #[test]
    fn add_no_args_is_usage() {
        assert_eq!(run(&["add".into()]).unwrap(), ExitCode::Usage);
    }

    /// Point `$VANTA_REGISTRY` at a local empty index so `load_registry` stays
    /// hermetic (no network fetch of the official default) during unit tests.
    fn use_empty_registry() {
        let p = std::env::temp_dir().join(format!("vanta-empty-reg-{}.toml", std::process::id()));
        std::fs::write(&p, "").unwrap();
        std::env::set_var("VANTA_REGISTRY", &p);
    }

    #[test]
    fn add_unknown_tool_resolves_to_error() {
        // Resolution fails for an unknown tool before any disk/network side effect.
        use_empty_registry();
        let err = run(&["add".into(), "totally-unknown-tool".into()]).unwrap_err();
        assert_eq!(err.area, Area::Res);
    }

    #[test]
    fn search_succeeds() {
        use_empty_registry();
        assert_eq!(
            run(&["search".into(), "node".into()]).unwrap(),
            ExitCode::Ok
        );
    }

    // M9: the trust gate recognizes a recorded manifest hash and refuses one
    // that was never trusted.
    #[test]
    fn trust_list_gates_untrusted_manifest() {
        let dir = std::env::temp_dir().join(format!("vanta-cli-trust-{}", std::process::id()));
        let _ = std::fs::remove_dir_all(&dir);
        std::fs::create_dir_all(&dir).unwrap();
        let hash = "a".repeat(64);
        // Nothing recorded yet → untrusted.
        assert!(!manifest_is_trusted(&dir, &hash));
        // Record the hash (as `vanta trust` would) → trusted.
        std::fs::write(dir.join(&hash), "manifest path").unwrap();
        assert!(manifest_is_trusted(&dir, &hash));
        // A different manifest's hash remains untrusted.
        assert!(!manifest_is_trusted(&dir, &"b".repeat(64)));
        let _ = std::fs::remove_dir_all(&dir);
    }
}