Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { Code2, PanelLeftClose, PanelLeftOpen, Plus } from "lucide-react";
import { ICON_LG } from "../../utils/iconSize.js";
import { Tooltip } from "../display/Tooltip.js";
import styles from "./ContextNav.module.scss";
/** A single selectable context in the {@link ContextNav} rail. */
export interface ContextItem {
/** Stable identifier (e.g. `"code"`). */
id: string;
/** Display label. */
label: string;
/** Icon element rendered before the label. */
icon: ReactNode;
/** `data-testid` for the context's button (e.g. `"context-code"`). */
testId: string;
}
/** Identifier of the default `Code` context (the only context in Phase 0). */
export const DEFAULT_CONTEXT_ID: string = "code";
/**
* Accessible name shared by the `<nav>` landmark and its `tablist`. The landmark
* names the region; the tablist needs its own name so assistive tech announces a
* named tab list (and so `getByRole("tablist")` can find it by label).
*/
const CONTEXT_NAV_LABEL: string = "Context navigation";
/**
* Canonical list of contexts, co-located with the component like {@link TABS}
* so icons/ids/test-ids stay a single source of truth. Phase 0 ships only
* `Code` (#1414); Agent rows are appended dynamically in #1417.
*/
export const CONTEXTS: ContextItem[] = [
{
id: DEFAULT_CONTEXT_ID,
label: "Code",
icon: <Code2 size={ICON_LG} />,
testId: "context-code",
},
];
/** Props for the {@link ContextNav} component. */
export interface ContextNavProps {
/** Contexts to list, in display order. */
contexts: ContextItem[];
/** Identifier of the currently active context. */
activeContextId: string;
/** Called with a context id when the user selects it. */
onSelectContext: (id: string) => void;
/** When `true`, the rail shows icons only (labels move into tooltips). */
collapsed?: boolean;
/** Called when the user toggles the collapsed state. Omit to hide the toggle. */
onToggleCollapsed?: () => void;
/** Called when the user clicks "Create Agent". Omit to hide the affordance. */
onCreateAgent?: () => void;
/**
* Fleet/overview items rendered in a section **above** the contexts — the
* cross-context altitude (e.g. Coordination, #1415). Unlike contexts, these
* navigate to a route, so the parent maps each id back to its destination.
* Omit or pass an empty array to render no Fleet section.
*/
fleetItems?: ContextItem[];
/** Identifier of the active fleet item, if any (route-derived by the parent). */
activeFleetId?: string;
/** Called with a fleet item id when selected (the parent navigates to its route). */
onSelectFleet?: (id: string) => void;
}
/**
* Vertical left rail for the **context axis** (#1414) — the outermost level of
* the context → view → detail navigation spine. Lists the contexts the user can
* enter (just `Code` today; Agent rows arrive in #1417) and is purely
* presentational: it takes the active id plus selection/toggle callbacks and
* never touches the router or `useGrackle`.
*
* An optional **Fleet** section sits above the contexts for cross-context
* overview surfaces (Coordination, #1415). Those items navigate to a route, so
* they render as plain buttons (not `tab`s) and stay out of the context
* `tablist`'s roving-tabindex group.
*
* Implements a vertical `tablist` with automatic activation — arrow keys move
* focus and select in one step, mirroring {@link AppNav}'s horizontal behavior.
*/
export function ContextNav({
contexts,
activeContextId,
onSelectContext,
collapsed = false,
onToggleCollapsed,
onCreateAgent,
fleetItems,
activeFleetId,
onSelectFleet,
}: ContextNavProps): JSX.Element {
const createAgentLabel = "Create Agent";
const tabListRef = useRef<HTMLDivElement>(null);
const handleKeyDown = useCallback(
(e: KeyboardEvent<HTMLElement>) => {
const buttons = tabListRef.current?.querySelectorAll<HTMLButtonElement>('[role="tab"]');
Iif (!buttons || buttons.length === 0) {
return;
}
const focusedIndex = Array.from(buttons).findIndex((b) => b === document.activeElement);
const currentIndex =
focusedIndex >= 0 ? focusedIndex : contexts.findIndex((c) => c.id === activeContextId);
let nextIndex = currentIndex;
if (e.key === "ArrowDown" || e.key === "j" || e.key === "J") {
e.preventDefault();
nextIndex = (currentIndex + 1) % contexts.length;
} else if (e.key === "ArrowUp" || e.key === "k" || e.key === "K") {
e.preventDefault();
nextIndex = (currentIndex - 1 + contexts.length) % contexts.length;
} else if (e.key === "Home") {
e.preventDefault();
nextIndex = 0;
} else if (e.key === "End") {
e.preventDefault();
nextIndex = contexts.length - 1;
} else E{
return;
}
onSelectContext(contexts[nextIndex].id);
buttons[nextIndex]?.focus(); // eslint-disable-line @typescript-eslint/no-unnecessary-condition -- index may be out of bounds
},
[activeContextId, contexts, onSelectContext],
);
return (
<nav
className={styles.rail}
aria-label={CONTEXT_NAV_LABEL}
data-testid="context-nav"
data-collapsed={collapsed}
>
{fleetItems && fleetItems.length > 0 && (
<div className={styles.fleetSection}>
{!collapsed && <span className={styles.sectionLabel}>Fleet</span>}
<div className={styles.fleetList} role="list" aria-label="Fleet overview">
{fleetItems.map((item) => {
const isActive = item.id === activeFleetId;
const button = (
<button
type="button"
aria-current={isActive ? "page" : undefined}
className={`${styles.tab} ${isActive ? styles.tabActive : ""}`}
onClick={() => onSelectFleet?.(item.id)}
data-testid={item.testId}
aria-label={item.label}
>
<span className={styles.tabIcon} aria-hidden="true">
{item.icon}
</span>
{!collapsed && <span className={styles.tabLabel}>{item.label}</span>}
</button>
);
// Each item is a `listitem` so the `role="list"` has valid children.
// When collapsed, labels live in a tooltip so the rail stays icon-only.
return (
<div key={item.id} role="listitem" className={styles.tabWrapper}>
{collapsed ? (
<Tooltip text={item.label} placement="right" inline={false}>
{button}
</Tooltip>
) : (
button
)}
</div>
);
})}
</div>
</div>
)}
<div
className={styles.tabList}
ref={tabListRef}
role="tablist"
aria-label={CONTEXT_NAV_LABEL}
aria-orientation="vertical"
onKeyDown={handleKeyDown}
>
{contexts.map((context, index) => {
const isActive = context.id === activeContextId;
const hasActiveContext = contexts.some((c) => c.id === activeContextId);
const isFocusable = isActive || (!hasActiveContext && index === 0);
const button = (
<button
role="tab"
type="button"
aria-selected={isActive}
tabIndex={isFocusable ? 0 : -1}
className={`${styles.tab} ${isActive ? styles.tabActive : ""}`}
onClick={() => onSelectContext(context.id)}
data-testid={context.testId}
aria-label={context.label}
>
<span className={styles.tabIcon} aria-hidden="true">
{context.icon}
</span>
{!collapsed && <span className={styles.tabLabel}>{context.label}</span>}
</button>
);
// When collapsed, labels live in a tooltip so the rail stays icon-only.
return collapsed ? (
<Tooltip key={context.id} text={context.label} placement="right" inline={false}>
{button}
</Tooltip>
) : (
<div key={context.id} className={styles.tabWrapper}>
{button}
</div>
);
})}
{onCreateAgent &&
(collapsed ? (
<Tooltip text={createAgentLabel} placement="right" inline={false}>
<button
type="button"
className={styles.createAgent}
onClick={onCreateAgent}
aria-label={createAgentLabel}
data-testid="context-nav-create-agent"
>
<span className={styles.tabIcon} aria-hidden="true">
<Plus size={ICON_LG} />
</span>
</button>
</Tooltip>
) : (
<button
type="button"
className={styles.createAgent}
onClick={onCreateAgent}
aria-label={createAgentLabel}
data-testid="context-nav-create-agent"
>
<span className={styles.tabIcon} aria-hidden="true">
<Plus size={ICON_LG} />
</span>
<span className={styles.tabLabel}>{createAgentLabel}</span>
</button>
))}
</div>
{onToggleCollapsed && (
<button
type="button"
className={styles.toggle}
onClick={onToggleCollapsed}
aria-label={collapsed ? "Expand context navigation" : "Collapse context navigation"}
aria-expanded={!collapsed}
data-testid="context-nav-toggle"
>
<span className={styles.tabIcon} aria-hidden="true">
{collapsed ? <PanelLeftOpen size={ICON_LG} /> : <PanelLeftClose size={ICON_LG} />}
</span>
{!collapsed && <span className={styles.tabLabel}>Collapse</span>}
</button>
)}
</nav>
);
}
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