//! Tests for `brokerd`'s configuration. Do not edit: these define the required behaviour.

use brokerd::config::{Approvals, Config, ConfigError, Sockets};
use std::path::{Path, PathBuf};

fn fixture(name: &str) -> PathBuf {
    Path::new(env!("CARGO_MANIFEST_DIR"))
        .join("tests/fixtures/config")
        .join(name)
}

/// What `home` must default to in this process. The test does not set the variable: changing the
/// environment of a running test binary would race with the other tests.
fn default_home() -> PathBuf {
    std::env::var_os("BOXMAKER_HOME")
        .map(PathBuf::from)
        .unwrap_or_else(|| PathBuf::from("/var/lib/boxmaker"))
}

#[test]
fn an_empty_file_gets_every_default() {
    let c = Config::load(&fixture("empty.toml")).unwrap();
    assert_eq!(c.paths.home, default_home());
    assert_eq!(c.paths.grants, PathBuf::from("/etc/boxmaker/grants"));
    assert_eq!(c.sockets, Sockets::default());
    assert_eq!(c.approvals, Approvals { ttl_ms: 900_000 });
    assert_eq!(Approvals::default(), Approvals { ttl_ms: 900_000 });
    assert_eq!(c, Config::parse("").unwrap());
    assert_eq!(c, Config::default());
}

#[test]
fn sockets_and_directories_default_to_places_under_home() {
    let c = Config::load(&fixture("home_only.toml")).unwrap();
    assert_eq!(c.paths.home, PathBuf::from("/srv/boxmaker"));
    assert_eq!(
        c.broker_socket(),
        PathBuf::from("/srv/boxmaker/run/loop-broker/broker.sock")
    );
    assert_eq!(
        c.admin_socket(),
        PathBuf::from("/srv/boxmaker/run/owner-broker/admin.sock")
    );
    assert_eq!(c.audit_dir(), PathBuf::from("/srv/boxmaker/audit"));
    assert_eq!(
        c.state_dir(),
        PathBuf::from("/srv/boxmaker/broker/sessions")
    );
    // The grants are not under home: the owner writes them, brokerd only reads them.
    assert_eq!(c.paths.grants, PathBuf::from("/etc/boxmaker/grants"));
}

#[test]
fn every_key_can_be_set() {
    let c = Config::load(&fixture("full.toml")).unwrap();
    assert_eq!(c.paths.home, PathBuf::from("/srv/boxmaker"));
    assert_eq!(c.paths.grants, PathBuf::from("/srv/boxmaker-grants"));
    assert_eq!(c.broker_socket(), PathBuf::from("/run/bx/broker.sock"));
    assert_eq!(c.admin_socket(), PathBuf::from("/run/bx/admin.sock"));
    assert_eq!(c.approvals.ttl_ms, 60_000);
    // The two directories always follow home.
    assert_eq!(c.audit_dir(), PathBuf::from("/srv/boxmaker/audit"));
    assert_eq!(
        c.state_dir(),
        PathBuf::from("/srv/boxmaker/broker/sessions")
    );
}

#[test]
fn one_socket_set_leaves_the_other_at_its_default() {
    let c =
        Config::parse("[paths]\nhome = \"/h\"\n[sockets]\nadmin = \"/x/admin.sock\"\n").unwrap();
    assert_eq!(c.admin_socket(), PathBuf::from("/x/admin.sock"));
    assert_eq!(
        c.broker_socket(),
        PathBuf::from("/h/run/loop-broker/broker.sock")
    );
}

#[test]
fn unknown_keys_and_tables_are_errors() {
    for name in ["unknown_key.toml", "unknown_table.toml", "wrong_type.toml"] {
        match Config::load(&fixture(name)) {
            Err(ConfigError::Parse(path, _)) => assert_eq!(path, fixture(name)),
            other => panic!("{name}: expected a parse error, got {other:?}"),
        }
    }
    // In every table, not only the one the fixture shows.
    for text in [
        "[paths]\nhome = \"/h\"\nhouse = \"/h\"\n",
        "[sockets]\nbroker = \"/b.sock\"\nloop = \"/l.sock\"\n",
        "[approvals]\nttl_ms = 1\nttl_s = 1\n",
        "top = 1\n",
        "[approvals]\nttl_ms = -5\n",
    ] {
        assert!(Config::parse(text).is_err(), "accepted: {text}");
    }
}

#[test]
fn a_missing_file_is_a_read_error_that_names_the_file() {
    let path = fixture("does-not-exist.toml");
    match Config::load(&path) {
        Err(ConfigError::Read(p, _)) => assert_eq!(p, path),
        other => panic!("expected a read error, got {other:?}"),
    }
    let text = Config::load(&path).unwrap_err().to_string();
    assert!(text.contains("does-not-exist.toml"), "{text}");
}

#[test]
fn a_parse_error_names_the_file_and_the_key() {
    let text = Config::load(&fixture("unknown_key.toml"))
        .unwrap_err()
        .to_string();
    assert!(text.contains("unknown_key.toml"), "{text}");
    assert!(text.contains("ttl"), "{text}");
}