# All files / src/components/layout ContextDetailShell.tsx

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     /**
     * ContextDetailShell — shared header + tab bar for context detail views.
     * Used by both the Code context and Agent detail pages so the
     * back-arrow / icon / name / tab-bar pattern is rendered from one component.
     *
     * @module
     */

    import { useCallback, useMemo, useRef, type JSX, type KeyboardEvent, type ReactNode } from "react";
    import { Activity, ArrowLeft, CalendarClock, Code2, MessageSquare, Settings } from "lucide-react";
    import { Tooltip } from "../display/Tooltip.js";
    import type { AgentTab } from "../../utils/navigation.js";
    import navStyles from "./AppNav.module.scss";
    import styles from "./ContextDetailShell.module.scss";

    /** A single tab in the {@link ContextDetailShell} tab bar. */
    export interface ContextDetailTab {
      /** Stable identifier used as the `activeTab` value. */
      id: string;
      /** Display label. */
      label: string;
      /** Icon element rendered before the label. */
      icon: ReactNode;
      /** Optional `data-testid` for the tab button. */
      testId?: string;
      /** When `"end"`, the tab is pinned to the right edge of the bar. */
      align?: "end";
    }

    /** Props for {@link ContextDetailShell}. */
    export interface ContextDetailShellProps {
      /** Icon element displayed in the header (avatar, Lucide icon, etc.). */
      icon: ReactNode;
      /** Context name displayed next to the icon. */
      name: string;
      /** Navigate back (e.g. to the home page). */
      onNavigateBack: () => void;
      /** Optional content rendered below the name (e.g. heartbeat status). */
      statusContent?: ReactNode;
      /** Tabs rendered in the tab bar. */
      tabs: ContextDetailTab[];
      /** Identifier of the currently active tab. */
      activeTab: string;
      /** Called with a tab id when the user selects a tab. */
      onSelectTab: (tabId: string) => void;
      /** Accessible label for the tab bar (`aria-label`). Defaults to `"Navigation"`. */
      ariaLabel?: string;
      /** `data-testid` for the header element. */
      headerTestId?: string;
      /** `data-testid` for the tab bar `<nav>` element. */
      tabBarTestId?: string;
    }

    /**
     * Shared layout shell for context detail pages. Renders a header row
     * (back arrow, icon, name, optional status) followed by a horizontal
     * tab bar with keyboard navigation and end-alignment support.
     */
    export function ContextDetailShell({
      icon,
      name,
      onNavigateBack,
      statusContent,
      tabs,
      activeTab,
      onSelectTab,
      ariaLabel = "Navigation",
      headerTestId,
      tabBarTestId,
    }: ContextDetailShellProps): JSX.Element {
      const tabListRef = useRef<HTMLElement>(null);

      const orderedTabs = useMemo(
        () => [...tabs.filter((t) => t.align !== "end"), ...tabs.filter((t) => t.align === "end")],
        [tabs],
      );
      const firstEndAlignedId = orderedTabs.find((t) => t.align === "end")?.id;

      const handleKeyDown = useCallback(
        (e: KeyboardEvent<HTMLElement>) => {
          const buttons = tabListRef.current?.querySelectorAll<HTMLButtonElement>('[role="tab"]');
          if (!buttons || buttons.length === 0) {
            return;
          }

          const focusedIndex = Array.from(buttons).findIndex((b) => b === document.activeElement);
          const currentIndex =
            focusedIndex >= 0 ? focusedIndex : orderedTabs.findIndex((t) => t.id === activeTab);
          let nextIndex = currentIndex;

          if (e.key === "ArrowRight" || e.key === "j" || e.key === "J") {
            e.preventDefault();
            nextIndex = (currentIndex + 1) % orderedTabs.length;
          } else if (e.key === "ArrowLeft" || e.key === "k" || e.key === "K") {
            e.preventDefault();
            nextIndex = (currentIndex - 1 + orderedTabs.length) % orderedTabs.length;
          } else if (e.key === "Home") {
            e.preventDefault();
            nextIndex = 0;
          } else if (e.key === "End") {
            e.preventDefault();
            nextIndex = orderedTabs.length - 1;
          } else {
            return;
          }

          onSelectTab(orderedTabs[nextIndex].id);
          buttons[nextIndex]?.focus(); // eslint-disable-line @typescript-eslint/no-unnecessary-condition -- index may be out of bounds
        },
        [activeTab, onSelectTab, orderedTabs],
      );

      return (
        <>
          <header className={styles.header} data-testid={headerTestId}>
            <button
              type="button"
              className={styles.backButton}
              onClick={onNavigateBack}
              aria-label="Back"
              data-testid={headerTestId ? `${headerTestId}-back` : undefined}
            >
              <ArrowLeft size={18} />
            </button>
            <span className={styles.icon} aria-hidden="true">
              {icon}
            </span>
            <div className={styles.info}>
              <h2
                className={styles.name}
                data-testid={headerTestId ? `${headerTestId}-name` : undefined}
              >
                {name}
              </h2>
              {statusContent}
            </div>
          </header>
          <nav
            ref={tabListRef}
            className={navStyles.nav}
            role="tablist"
            aria-label={ariaLabel}
            aria-orientation="horizontal"
            onKeyDown={handleKeyDown}
            data-testid={tabBarTestId}
          >
            {orderedTabs.map((tab) => {
              const isActive = tab.id === activeTab;
              const isFirstEndAligned = tab.id === firstEndAlignedId;
              return (
                <Tooltip
                  key={tab.id}
                  text={tab.label}
                  placement="bottom"
                  className={isFirstEndAligned ? navStyles.tabEnd : undefined}
                >
                  <button
                    role="tab"
                    type="button"
                    aria-selected={isActive}
                    tabIndex={isActive ? 0 : -1}
                    className={`${navStyles.tab} ${isActive ? navStyles.tabActive : ""}`}
                    onClick={() => onSelectTab(tab.id)}
                    data-testid={tab.testId}
                    aria-label={tab.label}
                  >
                    <span className={navStyles.tabIcon} aria-hidden="true">
                      {tab.icon}
                    </span>
                    <span className={navStyles.tabLabel}>{tab.label}</span>
                  </button>
                </Tooltip>
              );
            })}
          </nav>
        </>
      );
    }

    // ---------------------------------------------------------------------------
    // Pre-built tab arrays and icons for the two stock contexts (Code, Agent).
    // Consumers pass these to ContextDetailShell to avoid duplicating lucide
    // imports or re-defining the same tab lists.
    // ---------------------------------------------------------------------------

    const TAB_ICON_SIZE: number = 18;

    /** Icon element for the Code context header (matches the ContextNav rail icon). */
    export const CODE_HEADER_ICON: JSX.Element = <Code2 size={24} />;

    /** Tab definitions for the Agent detail view, with Settings right-aligned. */
    export const AGENT_DETAIL_TABS: (ContextDetailTab & { id: AgentTab })[] = [
      {
        id: "chat",
        label: "Chat",
        icon: <MessageSquare size={TAB_ICON_SIZE} />,
        testId: "agent-tab-chat",
      },
      {
        id: "sessions",
        label: "Sessions",
        icon: <Activity size={TAB_ICON_SIZE} />,
        testId: "agent-tab-sessions",
      },
      {
        id: "schedules",
        label: "Schedules",
        icon: <CalendarClock size={TAB_ICON_SIZE} />,
        testId: "agent-tab-schedules",
      },
      {
        id: "settings",
        label: "Settings",
        icon: <Settings size={TAB_ICON_SIZE} />,
        testId: "agent-tab-settings",
        align: "end",
      },
    ];