//! Unit tests for the lifecycle module (moved verbatim from the old
//! single-file `lifecycle.rs` `#[cfg(test)]` block).

use super::*;

/// Regression test: `setup_proposed` must seed both agent.nix and flake.nix
/// in the initial commit. Before commit 5b5a93e flake.nix was missing from
/// the scaffold, requiring manual creation (seen with the damocles agent).
#[tokio::test]
async fn setup_proposed_seeds_flake_nix() {
    let dir = tempfile::tempdir().expect("tempdir");
    let proposed = dir.path().join("proposed");
    setup_proposed(&proposed, "test-agent")
        .await
        .expect("setup_proposed");

    // Both files must exist on disk.
    assert!(proposed.join("agent.nix").exists(), "agent.nix missing");
    assert!(proposed.join("flake.nix").exists(), "flake.nix missing");

    // flake.nix must export nixosModules.default (the meta-flake contract).
    let flake = std::fs::read_to_string(proposed.join("flake.nix")).unwrap();
    assert!(
        flake.contains("nixosModules.default"),
        "flake.nix does not export nixosModules.default"
    );

    // Both files must be tracked in the initial git commit.
    let out = git_command()
        .current_dir(&proposed)
        .args(["show", "--name-only", "--format=", "HEAD"])
        .output()
        .await
        .expect("git show");
    let tracked = String::from_utf8_lossy(&out.stdout);
    assert!(tracked.contains("agent.nix"), "agent.nix not committed");
    assert!(tracked.contains("flake.nix"), "flake.nix not committed");
}

#[test]
fn agent_network_ip_is_in_subnet() {
    // Default subnet 10.42.0.0/24 — agents get .2 to .254.
    let ip = agent_network_ip("alice", "10.42.0.0/24").expect("should produce an IP");
    let octets: Vec<u8> = ip.split('.').map(|o| o.parse().unwrap()).collect();
    assert_eq!(&octets[..3], &[10, 42, 0], "wrong /24 prefix");
    assert!(
        octets[3] >= 2 && octets[3] <= 254,
        "host byte {}",
        octets[3]
    );
}

#[test]
fn agent_network_ip_stable() {
    // Same name + subnet must always produce the same IP.
    let a = agent_network_ip("damocles", "10.42.0.0/24");
    let b = agent_network_ip("damocles", "10.42.0.0/24");
    assert_eq!(a, b);
}

#[test]
fn agent_network_ip_different_agents() {
    // Different agent names very likely produce different IPs (not guaranteed,
    // but for these two names the hashes don't collide).
    let alice = agent_network_ip("alice", "10.42.0.0/24").unwrap();
    let bob = agent_network_ip("bob", "10.42.0.0/24").unwrap();
    assert_ne!(alice, bob, "alice and bob collide — rename one");
}

#[test]
fn agent_network_ip_different_subnet() {
    let ip = agent_network_ip("alice", "192.168.5.0/24").expect("should produce an IP");
    let octets: Vec<u8> = ip.split('.').map(|o| o.parse().unwrap()).collect();
    assert_eq!(&octets[..3], &[192, 168, 5]);
}

#[test]
fn bridge_gateway_ip_extracts_verbatim_address() {
    // HIVE_NETWORK_SUBNET carries the bridge IP verbatim, not the
    // canonical network — the gateway is the address before the `/`.
    assert_eq!(
        bridge_gateway_ip("10.42.0.1/24").as_deref(),
        Some("10.42.0.1")
    );
    // Non-`.1` operator override: the gateway is wherever the bridge is.
    assert_eq!(
        bridge_gateway_ip("10.42.0.254/24").as_deref(),
        Some("10.42.0.254")
    );
    assert_eq!(
        bridge_gateway_ip("172.30.0.1/16").as_deref(),
        Some("172.30.0.1")
    );
}

#[test]
fn bridge_gateway_ip_rejects_bad_input() {
    assert!(bridge_gateway_ip("notanip/24").is_none());
    assert!(bridge_gateway_ip("10.42.0.1").is_none()); // no prefix
    assert!(bridge_gateway_ip("10.42.0.1/33").is_none()); // prefix > 32
    assert!(bridge_gateway_ip("10.42.0.999/24").is_none()); // octet > 255
    assert!(bridge_gateway_ip("10.42.0/24").is_none()); // 3 octets
}

#[test]
fn agent_network_ip_rejects_bad_input() {
    assert!(agent_network_ip("alice", "notanip/24").is_none());
    assert!(agent_network_ip("alice", "10.0.0.0/33").is_none()); // prefix > 32
    assert!(agent_network_ip("alice", "10.0.0.0/31").is_none()); // too small
    assert!(agent_network_ip("alice", "10.0.0.0").is_none()); // no prefix
}

#[test]
fn agent_network_ip_normalizes_bridge_ip_subnet() {
    // HIVE_NETWORK_SUBNET carries the bridge IP (10.42.0.1/24), not
    // canonical network (10.42.0.0/24). Both must produce the same result
    // after host-bit masking.
    let from_bridge = agent_network_ip("alice", "10.42.0.1/24");
    let from_canonical = agent_network_ip("alice", "10.42.0.0/24");
    assert_eq!(
        from_bridge, from_canonical,
        "bridge-IP and canonical-network form should normalize to the same result"
    );
    // Result must still be in .2-.254.
    let ip = from_bridge.unwrap();
    let last: u8 = ip.rsplit('.').next().unwrap().parse().unwrap();
    assert!((2..=254).contains(&last), "host byte {last}");
}

/// `setup_proposed` is idempotent: calling it on an existing repo is a
/// no-op (the fresh guard skips all writes).
#[tokio::test]
async fn setup_proposed_idempotent() {
    let dir = tempfile::tempdir().expect("tempdir");
    let proposed = dir.path().join("proposed");
    setup_proposed(&proposed, "test-agent")
        .await
        .expect("first call");
    // Second call must not error even though .git already exists.
    setup_proposed(&proposed, "test-agent")
        .await
        .expect("second call");
    // Still one commit.
    let out = git_command()
        .current_dir(&proposed)
        .args(["rev-list", "--count", "HEAD"])
        .output()
        .await
        .expect("git rev-list");
    let count = String::from_utf8_lossy(&out.stdout).trim().to_owned();
    assert_eq!(
        count, "1",
        "expected exactly one commit after idempotent call"
    );
}