#[test]
fn overview_registry_is_single_source_of_identifiers_and_visibility_defaults() {
    let order = default_admin_dashboard_widgets();
    let hidden = default_hidden_dashboard_widgets();
    let unique: std::collections::HashSet<&str> = order.iter().map(String::as_str).collect();
    assert_eq!(unique.len(), order.len());
    assert_eq!(order.first().map(String::as_str), Some("requests"));
    assert!(order.contains(&"http3".to_owned()));
    assert!(hidden.contains(&"stream_overview".to_owned()));
    assert!(hidden.contains(&"stream_backend_health".to_owned()));
    for id in [
        "backend_health",
        "backend_activity",
        "backend_errors",
        "backend_latency",
        "backend_traffic",
        "backend_protocols",
        "backend_requests",
        "backend_capacity",
        "backend_http5xx",
        "backend_timeouts",
        "backend_network",
        "backend_retries",
        "backend_queue",
        "backend_rotations",
    ] {
        assert!(order.contains(&id.to_owned()));
        assert!(hidden.contains(&id.to_owned()));
    }
    for id in [
        "extra_process_cpu",
        "extra_process_rss",
        "extra_process_fds",
        "extra_open_connections",
        "extra_websocket_active",
        "extra_tls_error_rate",
        "extra_request_error_rate",
        "extra_cache_hit_rate",
        "extra_cache_memory",
        "extra_h2_share",
        "extra_response_latency",
        "extra_backend_unhealthy",
    ] {
        assert!(order.contains(&id.to_owned()));
        assert!(hidden.contains(&id.to_owned()));
    }
    for id in [
        "traffic_chart",
        "system_chart",
        "connection_chart",
        "cache_diagnostics",
        "process_diagnostics",
        "network_diagnostics",
        "backend_table",
    ] {
        assert!(order.contains(&id.to_owned()));
        assert!(!hidden.contains(&id.to_owned()));
    }
    assert!(!hidden.contains(&"requests".to_owned()));
    assert!(hidden.iter().all(|id| order.contains(id)));
    assert!(validate_admin_preferences(&AdminPreferences::default()).is_ok());
}

#[test]
fn interface_themes_include_optional_black_and_cream_without_changing_default() {
    let mut preferences = AdminPreferences::default();
    assert_eq!(preferences.theme, "dark");
    for theme in ["dark", "ultra_dark", "light", "cream"] {
        preferences.theme = theme.to_owned();
        assert!(validate_admin_preferences(&preferences).is_ok(), "{theme}");
    }
    preferences.theme = "sepia".to_owned();
    assert!(validate_admin_preferences(&preferences).is_err());
}

#[test]
fn corner_style_defaults_and_rejects_unknown_presets() {
    let mut prefs = AdminPreferences::default();
    assert_eq!(prefs.corner_style, "default");
    for preset in ["default", "square", "subtle", "rounded", "extra"] {
        prefs.corner_style = preset.to_string();
        assert!(validate_admin_preferences(&prefs).is_ok(), "{preset}");
    }
    prefs.corner_style = "oversized".to_string();
    assert!(validate_admin_preferences(&prefs).is_err());
    let old_json = r#"{"theme":"ultra_dark"}"#;
    let old: AdminPreferences = serde_json::from_str(old_json).unwrap();
    assert_eq!(old.corner_style, "default");
    assert!(validate_admin_preferences(&old).is_ok());
}

#[test]
fn old_widget_preferences_preserve_order_opt_in_and_survive_unknown_ids() {
    let mut prefs = AdminPreferences::default();
    prefs.dashboard_widgets = vec![
        "errors".into(),
        "from_future_release".into(),
        "requests".into(),
        "errors".into(),
    ];
    prefs.dashboard_hidden_widgets = vec![
        "errors".into(),
        "from_future_release".into(),
        "errors".into(),
    ];
    reconcile_dashboard_widgets(&mut prefs);
    assert_eq!(prefs.dashboard_widgets[0], "errors");
    assert_eq!(prefs.dashboard_widgets[1], "requests");
    assert!(!prefs
        .dashboard_widgets
        .contains(&"from_future_release".into()));
    assert!(!prefs
        .dashboard_hidden_widgets
        .contains(&"from_future_release".into()));
    assert_eq!(
        prefs
            .dashboard_hidden_widgets
            .iter()
            .filter(|id| *id == "errors")
            .count(),
        1
    );
    assert!(prefs
        .dashboard_hidden_widgets
        .contains(&"stream_overview".into()));
    assert!(prefs
        .dashboard_hidden_widgets
        .contains(&"stream_backend_health".into()));
    assert!(prefs
        .dashboard_hidden_widgets
        .contains(&"backend_health".into()));
    assert!(prefs
        .dashboard_hidden_widgets
        .contains(&"backend_protocols".into()));
    assert!(prefs
        .dashboard_hidden_widgets
        .contains(&"backend_requests".into()));
    assert!(prefs
        .dashboard_hidden_widgets
        .contains(&"backend_capacity".into()));
    assert!(prefs
        .dashboard_hidden_widgets
        .contains(&"extra_process_cpu".into()));
    assert!(prefs.dashboard_widgets.contains(&"backend_table".into()));
    // 0.33.0 WWW cards stay opt-in when upgrading an old saved custom layout.
    for id in [
        "www_status",
        "www_kind",
        "www_capacity",
        "www_methods",
        "www_error_rate",
        "www_php_requests",
        "www_requests",
        "www_latency",
        "www_failures",
        "www_traffic",
        "www_top_services",
        "www_status_trend",
    ] {
        assert!(prefs.dashboard_widgets.contains(&id.into()), "missing {id}");
        assert!(
            prefs.dashboard_hidden_widgets.contains(&id.into()),
            "visible on upgrade: {id}"
        );
    }

    assert!(!prefs
        .dashboard_hidden_widgets
        .contains(&"backend_table".into()));
    for id in [
        "backend_http5xx",
        "backend_timeouts",
        "backend_network",
        "backend_retries",
        "backend_queue",
        "backend_rotations",
    ] {
        assert!(prefs.dashboard_hidden_widgets.contains(&id.into()));
    }
    assert!(validate_admin_preferences(&prefs).is_ok());
}

#[test]
fn explicit_visible_stream_opt_in_is_not_reset_when_normalizing_saved_order() {
    let mut prefs = AdminPreferences::default();
    prefs.dashboard_widgets = default_admin_dashboard_widgets();
    prefs.dashboard_hidden_widgets.clear();
    reconcile_dashboard_widgets(&mut prefs);
    assert!(prefs.dashboard_hidden_widgets.is_empty());
    assert_eq!(prefs.dashboard_widgets, default_admin_dashboard_widgets());
    assert!(validate_admin_preferences(&prefs).is_ok());
}