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

0% Statements 0/169
0% Branches 0/1
0% Functions 0/1
0% Lines 0/169

Press n or j to go to the next uncovered block, b, p or k for the previous block.

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    41
    42
    43
    44
    45
    46
    47
    48
    49
    50
    51
    52
    53
    54
    55
    56
    57
    58
    59
    60
    61
    62
    63
    64
    65
    66
    67
    68
    69
    70
    71
    72
    73
    74
    75
    76
    77
    78
    79
    80
    81
    82
    83
    84
    85
    86
    87
    88
    89
    90
    91
    92
    93
    94
    95
    96
    97
    98
    99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    147
    148
    149
    150
    151
    152
    153
    154
    155
    156
    157
    158
    159
    160
    161
    162
    163
    164
    165
    166
    167
    168
    169
    170
    171
    172
    173
    174
    175
    176
    177
    178
    179
    180
    181
    182
    183
    184
    185
    186
    187
    188
    189
    190
    191
    192
    193
    194
    195
    196
    197
    198
    199
    200
    201
    202
    203
    204
    205
    206
    207
    208
    209
    210
    211
    212
    213
    214
    215
    216
    217
    218
    219
    220
    221
    222
    223
    224
    225
    226
    227
    228
    229
    230
    231
    232
    233
    234
    235
    236
    237
    238
    239
    240
    241
    242
    243
    244
    245
    246
    247
    248
    249
    250
    251
    252
    253
    254
    255
    256
    257
    258
    259
    260
    261
    262
    263
    264
    265
    266

     import { useCallback, useRef, type JSX, type KeyboardEvent, type ReactNode } from "react";
    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"]');
          if (!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 {
            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>
      );
    }