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

    #[test]
    fn operational_saves_keep_cache_identity_but_cache_affecting_saves_rotate_it() {
        let base = config::demo_config("127.0.0.1:9000".parse().unwrap());
        let identity = cache_revision(&base);

        let mut file_transport = base.clone();
        file_transport.web_services.push(crate::web_server::Service {
            id: "static-test".into(), name: "Static Test".into(),
            document_root: "/var/www/static-test".into(),
            ..Default::default()
        });
        let mut zero_copy = file_transport.clone();
        zero_copy.web_services[0].sendfile = crate::web_server::SendfileMode::Auto;
        assert_eq!(cache_revision(&file_transport), cache_revision(&zero_copy));
        assert!(matches!(cache_invalidation(&file_transport, &zero_copy), CacheInvalidation::None));

        let mut logging = base.clone();
        logging.logging.file.path = "/tmp/rustproxy-test-access.jsonl".into();
        assert_eq!(cache_revision(&logging), identity);
        assert!(matches!(
            cache_invalidation(&base, &logging),
            CacheInvalidation::None
        ));

        let mut metrics = base.clone();
        metrics.prometheus.include_system = !metrics.prometheus.include_system;
        assert_eq!(cache_revision(&metrics), identity);

        let mut response = base.clone();
        response.server_header.value = "edge-test".into();
        response.diagnostic_headers.request_id = !response.diagnostic_headers.request_id;
        response.compression.gzip = !response.compression.gzip;
        assert_eq!(cache_revision(&response), identity);

        let mut docker = base.clone();
        docker.docker_agents.agents.push(crate::docker::Agent {
            id: "node1".into(),
            name: "Node 1".into(),
            ..Default::default()
        });
        assert_eq!(cache_revision(&docker), identity);

        let mut preset = base.clone();
        preset.cache.memory_preset = Some(crate::cache::MemoryPreset::Recommended);
        preset.cache.cold_preset = Some(crate::cache::ColdPreset::Recommended);
        preset.transform.preset = Some(crate::transform::Preset::Uber);
        preset.transform.memory_budget_bytes = 1024 * 1024 * 1024;
        preset.transform.max_inflight = 128;
        assert_eq!(cache_revision(&preset), identity);
        assert!(matches!(
            cache_invalidation(&base, &preset),
            CacheInvalidation::None
        ));

        let mut transform_policy = base.clone();
        transform_policy.transform.json = !transform_policy.transform.json;
        assert_ne!(cache_revision(&transform_policy), identity);

        let mut transform_body_limit = base.clone();
        transform_body_limit.transform.max_body_bytes += 1024;
        assert_ne!(cache_revision(&transform_body_limit), identity);

        let mut wire_only = base.clone();
        wire_only.cache.bypass_query = !wire_only.cache.bypass_query;
        wire_only.cache.bypass_prefixes.push("/private".into());
        wire_only.cache.expose_status = !wire_only.cache.expose_status;
        wire_only.cache.expose_hits = !wire_only.cache.expose_hits;
        wire_only.cache.expose_cache_status = !wire_only.cache.expose_cache_status;
        wire_only.cache.expose_resident_age = !wire_only.cache.expose_resident_age;
        wire_only.cache.expose_only_hits = !wire_only.cache.expose_only_hits;
        wire_only.cache.via_header = Some("RustProxy edge".into());
        wire_only.cache.http_invalidation_allowed_cidrs = vec!["192.0.2.42".into()];
        assert_eq!(cache_revision(&wire_only), identity);
        assert!(matches!(
            cache_invalidation(&base, &wire_only),
            CacheInvalidation::None
        ));

        for label in ["http2", "http3"] {
            let mut protocol_only = base.clone();
            if label == "http2" {
                protocol_only.vhosts[0].http2_enabled = !base.vhosts[0].http2_enabled;
            } else {
                protocol_only.vhosts[0].http3_enabled = !base.vhosts[0].http3_enabled;
            }
            // The effective configuration really changes, but the cache key
            // does not. This must hold for both toggling directions.
            assert_ne!(
                (protocol_only.vhosts[0].http2_enabled, protocol_only.vhosts[0].http3_enabled),
                (base.vhosts[0].http2_enabled, base.vhosts[0].http3_enabled),
                "{label} toggle did not change a transport switch"
            );
            assert_eq!(cache_revision(&protocol_only), identity, "{label} rotated cache");
            assert!(matches!(cache_invalidation(&base, &protocol_only), CacheInvalidation::None));
            assert!(matches!(cache_invalidation(&protocol_only, &base), CacheInvalidation::None));
        }
        let mut both_protocols = base.clone();
        both_protocols.vhosts[0].http2_enabled = !base.vhosts[0].http2_enabled;
        both_protocols.vhosts[0].http3_enabled = !base.vhosts[0].http3_enabled;
        assert_eq!(cache_revision(&both_protocols), identity);
        assert!(matches!(cache_invalidation(&base, &both_protocols), CacheInvalidation::None));

        let mut vhost_diagnostics = base.clone();
        vhost_diagnostics.vhosts[0].cache.expose_only_hits = Some(true);
        assert_eq!(cache_revision(&vhost_diagnostics), identity);
        assert!(matches!(cache_invalidation(&base, &vhost_diagnostics), CacheInvalidation::None));

        let mut cache = base.clone();
        cache.cache.max_entries += 1;
        let cache_identity = cache_revision(&cache);
        assert_ne!(cache_identity, identity);
        assert!(matches!(
            cache_invalidation(&base, &cache),
            CacheInvalidation::All(value) if value == cache_identity
        ));

        let mut operational = base.clone();
        operational.vhosts[0].load_balancing.keepalive.enabled = false;
        operational.vhosts[0].load_balancing.keepalive.idle_timeout_seconds = 90;
        operational.vhosts[0].load_balancing.keepalive.max_idle_per_host = 32;
        operational.vhosts[0].load_balancing.keepalive.tcp_keepalive_seconds = 90;
        operational.vhosts[0].load_balancing.keepalive.pool_recycle_requests = 1_000;
        operational.vhosts[0].load_balancing.keepalive.pool_recycle_seconds = 1_800;
        operational.vhosts[0].load_balancing.keepalive.http1_max_buffer_bytes = 65_536;
        operational.vhosts[0].backends[0].weight += 1;
        operational.vhosts[0].backends[0].max_concurrent_requests = 16;
        operational.vhosts[0].backends[0].queue_timeout_ms = 100;
        operational.vhosts[0].timing_headers = true;
        operational.vhosts[0].acl_profile_id = Some("test-only-acl".into());
        operational.vhosts[0].user_agent_blocking = Default::default();
        operational.vhosts[0].proxy_timeouts.read_timeout_seconds = Some(180);
        assert_eq!(cache_revision(&operational), identity);
        assert_eq!(vhost_cache_revision(&operational.vhosts[0]), vhost_cache_revision(&base.vhosts[0]));
        assert!(matches!(cache_invalidation(&base, &operational), CacheInvalidation::None));
        assert!(matches!(cache_invalidation(&operational, &base), CacheInvalidation::None));

        let mut vhost = base.clone();
        vhost.vhosts[0].backends[0].url = "http://127.0.0.1:9001".into();
        assert_eq!(cache_revision(&vhost), identity);
        let affected_id = base.vhosts[0].id.clone();
        assert!(matches!(cache_invalidation(&base, &vhost), CacheInvalidation::Scopes(ids) if ids == vec![affected_id]));

        // A content change must not invalidate another independent vhost.
        let mut multiple = base.clone();
        let mut another = multiple.vhosts[0].clone();
        another.id = "other-scope".into();
        another.frontend.hosts = vec!["other.example.test".into()];
        multiple.vhosts.push(another);
        let mut changed_one = multiple.clone();
        changed_one.vhosts[0].backends[0].url = "http://127.0.0.1:9002".into();
        assert!(matches!(cache_invalidation(&multiple, &changed_one), CacheInvalidation::Scopes(ids)
            if ids == vec![base.vhosts[0].id.clone()]));
        let mut changed_global = multiple.clone();
        changed_global.transform.max_body_bytes += 1;
        assert!(matches!(cache_invalidation(&multiple, &changed_global), CacheInvalidation::All(_)));
    }
}