//! B8 `org audit` verified-signer attribution — integration coverage.
//!
//! The audit logic (`resolve_signer`, `parse_audit_log`, `run_org_audit`) lives
//! in the bin crate's private `commands::org` module and the CLI dispatch is not
//! wired until B14, so we cannot drive `org audit` through the binary yet. What
//! we CAN do is build a real signed org vault via `org init` and assert that the
//! exact verification mechanism `resolve_signer` uses — a temp `allowed_signers`
//! prefixed `relicario `, injected via `GIT_CONFIG_*`, then
//! `git verify-commit --raw`, then the `key (SHA256:...)` regex over stderr —
//! resolves the genesis commit's signature to the seeded member's fingerprint.
//!
//! This pins the security-critical half of B8 (attribute to the VERIFIED signer,
//! mirroring the pre-receive hook) against a genuine SSH signature rather than
//! the synthetic-log unit tests, which only cover the "no member matched ->
//! TAMPERED" fallback.

use std::fs;
use std::io::Write;
use std::path::Path;
use std::process::Command;
use tempfile::{NamedTempFile, TempDir};

fn relicario_with_git_identity(config_home: &Path, args: &[&str]) -> std::process::Output {
    Command::new(env!("CARGO_BIN_EXE_relicario"))
        .env("XDG_CONFIG_HOME", config_home)
        .env("HOME", config_home)
        .env("GIT_AUTHOR_NAME", "Test Device")
        .env("GIT_AUTHOR_EMAIL", "test@relicario.test")
        .env("GIT_COMMITTER_NAME", "Test Device")
        .env("GIT_COMMITTER_EMAIL", "test@relicario.test")
        .args(args)
        .output()
        .expect("run relicario")
}

/// Lay out a device keypair under `<config_home>/relicario/devices/<name>/` and
/// mark it current. Mirrors `org_init_signing::seed_device`. Returns the OpenSSH
/// public key string.
fn seed_device(config_home: &Path, name: &str) -> String {
    let (priv_openssh, pub_openssh) =
        relicario_core::device::generate_keypair().expect("generate_keypair");

    let dev_dir = config_home.join("relicario").join("devices").join(name);
    fs::create_dir_all(&dev_dir).expect("create device dir");
    let signing_key_path = dev_dir.join("signing.key");
    fs::write(&signing_key_path, priv_openssh.as_str()).expect("write signing.key");
    #[cfg(unix)]
    {
        use std::os::unix::fs::PermissionsExt;
        fs::set_permissions(&signing_key_path, fs::Permissions::from_mode(0o600))
            .expect("chmod signing.key");
    }
    fs::write(dev_dir.join("signing.pub"), &pub_openssh).expect("write signing.pub");
    fs::write(dev_dir.join("deploy.key"), "").expect("write stub deploy.key");
    fs::write(dev_dir.join("deploy.pub"), "").expect("write stub deploy.pub");

    let devices_dir = config_home.join("relicario").join("devices");
    fs::write(devices_dir.join("current"), format!("{name}\n")).expect("write current");

    pub_openssh
}

/// Replicate `commands::org::resolve_signer`'s verification: build an
/// allowed_signers file from the given pubkeys (prefixed `relicario `), inject it
/// via GIT_CONFIG_*, run `git verify-commit --raw`, and parse the SHA256 key
/// fingerprint from stderr.
fn resolve_signer_fp(org_root: &Path, commit: &str, pubkeys: &[&str]) -> Option<String> {
    let mut tmp = NamedTempFile::new().ok()?;
    for pk in pubkeys {
        writeln!(tmp, "relicario {}", pk.trim()).ok()?;
    }
    let allowed_path = tmp.path();

    let output = Command::new("git")
        .current_dir(org_root)
        .args(["verify-commit", "--raw", commit])
        .env("GIT_CONFIG_COUNT", "1")
        .env("GIT_CONFIG_KEY_0", "gpg.ssh.allowedSignersFile")
        .env("GIT_CONFIG_VALUE_0", allowed_path.as_os_str())
        .output()
        .ok()?;

    // The clean exit IS the gate (matches the hook): a non-member signature fails.
    if !output.status.success() {
        return None;
    }
    let stderr = String::from_utf8_lossy(&output.stderr);
    let re = regex::Regex::new(r"key (SHA256:[A-Za-z0-9+/]+)").ok()?;
    Some(re.captures(&stderr)?.get(1)?.as_str().to_string())
}

#[test]
fn audit_resolves_genesis_commit_to_the_signing_member() {
    let cfg = TempDir::new().unwrap();
    let org = TempDir::new().unwrap();

    let pub_openssh = seed_device(cfg.path(), "test-dev");

    let init = relicario_with_git_identity(
        cfg.path(),
        &["org", "init", "--dir", org.path().to_str().unwrap(), "--name", "Acme"],
    );
    assert!(
        init.status.success(),
        "org init failed:\nstdout: {}\nstderr: {}",
        String::from_utf8_lossy(&init.stdout),
        String::from_utf8_lossy(&init.stderr)
    );

    // The signing member's pubkey is recorded in members.json. resolve_signer
    // builds allowed_signers from exactly that set.
    let members_json =
        fs::read_to_string(org.path().join("members.json")).expect("read members.json");
    let members: relicario_core::OrgMembers =
        serde_json::from_str(&members_json).expect("parse members.json");
    assert_eq!(members.members.len(), 1, "init seeds exactly one owner member");
    let owner = &members.members[0];

    // The genesis commit must resolve to the owner's fingerprint.
    let signing_fp = resolve_signer_fp(org.path(), "HEAD", &[owner.ed25519_pubkey.as_str()])
        .expect("genesis commit signature must verify against the member set");
    let expected = relicario_core::fingerprint(&owner.ed25519_pubkey).expect("fingerprint owner");
    assert_eq!(
        signing_fp, expected,
        "verified signer fingerprint must equal the owner member's fingerprint"
    );

    // The seeded pubkey and the members.json pubkey are the same key.
    assert_eq!(owner.ed25519_pubkey.trim(), pub_openssh.trim());
}

#[test]
fn audit_rejects_signature_from_a_non_member_key() {
    // A commit signed by the owner must NOT resolve when the allowed_signers set
    // contains only some OTHER (non-member) key — this is the TAMPERED path:
    // "signer is not a current member".
    let cfg = TempDir::new().unwrap();
    let org = TempDir::new().unwrap();

    let _owner_pub = seed_device(cfg.path(), "test-dev");
    let init = relicario_with_git_identity(
        cfg.path(),
        &["org", "init", "--dir", org.path().to_str().unwrap(), "--name", "Acme"],
    );
    assert!(init.status.success(), "org init failed");

    // A stranger keypair that never signed anything in this repo.
    let (_stranger_priv, stranger_pub) =
        relicario_core::device::generate_keypair().expect("generate stranger keypair");

    let resolved = resolve_signer_fp(org.path(), "HEAD", &[stranger_pub.as_str()]);
    assert!(
        resolved.is_none(),
        "a commit signed by the owner must not verify against a stranger-only signer set"
    );
}