//! Integration tests for the OS-level split-tunnel helper (`aura_cli::os_routes::OsRouteGuard`).
//!
//! These tests only exercise the dry-run path: real `ip` / `route` programming needs root and a
//! live network stack, which is inappropriate for the unit test runner. The dry-run path is
//! platform-portable: it logs `would run: ...` for both the Linux and macOS plans (plus the
//! Windows-stub notice) and never touches the host.

use std::net::IpAddr;

use aura_cli::config::{ClientConfigFile, OsRoutesSection, SplitRule, SplitSection};
use aura_cli::os_routes::{DefaultAction, OsRouteGuard, SplitRoutes};

/// Dry-run install must succeed on every host (Linux, macOS, Windows) regardless of which
/// gateway / egress hints are provided. Drop must not panic.
#[test]
fn dry_run_install_succeeds_on_any_platform() {
    let split = SplitRoutes {
        default: DefaultAction::Vpn,
        direct_cidrs: vec!["192.168.0.0/16".parse().unwrap()],
        vpn_cidrs: Vec::new(),
        direct_hosts: vec!["1.2.3.4".parse().unwrap()],
        vpn_hosts: Vec::new(),
    };
    let guard = OsRouteGuard::install("aura0", &split, None, None, true)
        .expect("dry_run install must succeed everywhere");
    drop(guard);
}

/// Dry-run also accepts explicit gateway / egress overrides — they are rendered into the
/// `would run: ...` lines without needing to invoke the host's `ip`/`route` binary.
#[test]
fn dry_run_install_accepts_explicit_overrides() {
    let split = SplitRoutes {
        default: DefaultAction::Direct,
        vpn_cidrs: vec!["10.7.0.0/24".parse().unwrap()],
        ..Default::default()
    };
    let guard = OsRouteGuard::install(
        "utun4",
        &split,
        Some("10.0.0.1"),
        Some("en0"),
        /* dry_run */ true,
    )
    .expect("dry_run install with explicit gateway/egress must succeed");
    drop(guard);
}

/// `SplitRoutes::from_config` collects CIDRs from both branches and any resolved domain hosts.
#[test]
fn split_routes_from_config_collects_everything() {
    let split = SplitSection {
        default: "VPN".into(),
        direct: vec![SplitRule {
            cidr: Some("192.168.0.0/16".into()),
            domain: None,
        }],
        vpn: vec![SplitRule {
            cidr: Some("10.7.0.0/24".into()),
            domain: None,
        }],
    };
    let resolved: Vec<(String, aura_tunnel::RouteAction, Vec<IpAddr>)> = vec![(
        "intranet.example.com".into(),
        aura_tunnel::RouteAction::Direct,
        vec!["1.2.3.4".parse().unwrap()],
    )];
    let r = SplitRoutes::from_config(&split, &resolved);
    assert_eq!(r.default, DefaultAction::Vpn);
    assert_eq!(r.direct_cidrs.len(), 1);
    assert_eq!(r.vpn_cidrs.len(), 1);
    assert_eq!(r.direct_hosts.len(), 1);
    assert!(r.vpn_hosts.is_empty());
}

/// A `client.toml` without a `[tunnel.os_routes]` section still parses; the field is `None`.
/// This is the explicit back-compat check — old configs do not need to know about the new
/// section.
#[test]
fn client_toml_without_os_routes_section_parses() {
    let minimal = r#"
[client]
name = "x"
server_addr = "1.2.3.4:443"
sni = "a"

[pki]
ca_cert = "a"
cert = "b"
key = "c"

[tunnel]
local_ip = "10.7.0.2"

[tunnel.split]
default = "VPN"
"#;
    let cfg = ClientConfigFile::parse(minimal).expect("parses minimal client.toml");
    assert!(
        cfg.tunnel.os_routes.is_none(),
        "without the section, os_routes is None — runtime falls back to enabled = true default"
    );
}

/// `[tunnel.os_routes]` with `enabled = true, dry_run = true` parses end-to-end and exposes the
/// flags to the client startup path.
#[test]
fn client_toml_parses_os_routes_section() {
    let s = r#"
[client]
name = "x"
server_addr = "1.2.3.4:443"
sni = "a"

[pki]
ca_cert = "a"
cert = "b"
key = "c"

[tunnel]
local_ip = "10.7.0.2"

[tunnel.os_routes]
enabled = true
dry_run = true
gateway = "192.168.1.1"
egress_iface = "en0"

[tunnel.split]
default = "VPN"
"#;
    let cfg = ClientConfigFile::parse(s).expect("parses client.toml with [tunnel.os_routes]");
    let os = cfg.tunnel.os_routes.expect("section present");
    assert!(os.enabled);
    assert!(os.dry_run);
    assert_eq!(os.gateway.as_deref(), Some("192.168.1.1"));
    assert_eq!(os.egress_iface.as_deref(), Some("en0"));
}

/// `OsRoutesSection::default()` matches the documented v2 semantics: enabled by default with
/// no dry_run and no explicit gateway/egress (auto-detected at runtime).
#[test]
fn os_routes_section_default_values() {
    let d = OsRoutesSection::default();
    assert!(
        d.enabled,
        "default is enabled = true (v2 eliminates the v1 stub)"
    );
    assert!(!d.dry_run);
    assert!(d.gateway.is_none());
    assert!(d.egress_iface.is_none());
}