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kandev/apps/web/components/task/dockview-session-tabs.ts
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TypeScript

import { useEffect, useRef } from "react";
import type { DockviewApi, DockviewReadyEvent, AddPanelOptions } from "dockview-react";
import type { StoreApi } from "zustand";
import type { AppState } from "@/lib/state/store";
import { useDockviewStore } from "@/lib/state/dockview-store";
import { focusOrAddPanel } from "@/lib/state/dockview-layout-builders";
import { useAppStore, useAppStoreApi } from "@/components/state-provider";
import { wasPRPanelOffered, markPRPanelOffered } from "@/lib/local-storage";
import { sessionId as toSessionId } from "@/lib/types/ids";
import { createDebugLogger, IS_DEBUG } from "@/lib/debug/log";
const debug = createDebugLogger("dockview:session-tabs");
/**
* Sync `activeSessionId` in the store when the user clicks a session tab.
* Layouts are env-keyed, so switching between sessions of the same task is
* a no-op at the layout level — the env switch action short-circuits when
* old==new env. No manual skip flag needed.
*/
export function setupSessionTabSync(api: DockviewReadyEvent["api"], appStore: StoreApi<AppState>) {
return api.onDidActivePanelChange((panel) => {
if (!panel) return;
if (useDockviewStore.getState().isRestoringLayout) return;
if (!panel.id.startsWith("session:")) return;
const sid = panel.id.slice("session:".length);
if (sid && sid !== appStore.getState().tasks.activeSessionId) {
const taskId = appStore.getState().tasks.activeTaskId;
if (taskId) {
appStore.getState().setActiveSession(taskId, sid);
}
}
});
}
/**
* Re-create a chat or session panel if the last one is removed.
* Prevents the user from ending up with no chat panel at all.
*
* Uses a delayed check to avoid racing with dockview drag-to-split
* operations, which temporarily remove and re-add panels.
*/
export function setupChatPanelSafetyNet(
api: DockviewReadyEvent["api"],
appStore: StoreApi<AppState>,
) {
return api.onDidRemovePanel((panel) => {
if (useDockviewStore.getState().isRestoringLayout) return;
const isChatPanel = panel.id === "chat" || panel.id.startsWith("session:");
if (!isChatPanel) return;
// Double rAF gives dockview time to finish internal operations like
// drag-to-split moves (remove from old group → add to new group).
requestAnimationFrame(() => {
requestAnimationFrame(() => {
if (useDockviewStore.getState().isRestoringLayout) return;
const hasChatPanel = api.panels.some((p) => p.id === "chat" || p.id.startsWith("session:"));
if (hasChatPanel) return;
const activeSessionId = appStore.getState().tasks.activeSessionId;
const sb = api.getPanel("sidebar");
const position = sb
? { direction: "right" as const, referencePanel: "sidebar" }
: undefined;
// Only recreate a panel if there's still an active session.
// If all sessions were deleted, leave the layout empty — the user
// can create a new session via the "+" menu.
if (!activeSessionId) return;
// Don't recreate a panel for a session that no longer exists in the
// store — this guards against handleDelete racing with the safety net.
const activeTaskId = appStore.getState().tasks.activeTaskId;
const knownSessions = activeTaskId
? (appStore.getState().taskSessionsByTask.itemsByTaskId[activeTaskId] ?? [])
: [];
if (!knownSessions.some((s) => s.id === activeSessionId)) return;
api.addPanel({
id: `session:${activeSessionId}`,
component: "chat",
tabComponent: "sessionTab",
title: "Agent",
params: { sessionId: activeSessionId },
position,
});
const nc = api.getPanel(`session:${activeSessionId}`);
if (nc) useDockviewStore.setState({ centerGroupId: nc.group.id });
});
});
});
}
// ---------------------------------------------------------------------------
// Auto-show PR detail panel
// ---------------------------------------------------------------------------
/** Pure decision function for whether the PR panel should be auto-added or removed. */
export function shouldAutoAddPRPanel(params: {
hasPR: boolean;
panelExists: boolean;
isRestoringLayout: boolean;
isMaximized: boolean;
wasOffered: boolean;
}): "add" | "remove" | "none" {
if (!params.hasPR && params.panelExists) return "remove";
if (!params.hasPR) return "none";
if (params.panelExists) return "none";
if (params.isRestoringLayout) return "none";
if (params.isMaximized) return "none";
if (params.wasOffered) return "none";
return "add";
}
/**
* Resolve the group ID to anchor the PR detail panel to.
*
* Preference: the live session chat panel's group. It's the group the user is
* actively looking at, and reading it directly avoids the stale-id window the
* store's centerGroupId has across layout transitions (which caused the PR
* panel to land in a split instead of as a tab next to the session).
*/
export function resolvePRPanelTargetGroup(
api: DockviewApi,
sessionId: string,
centerGroupId: string,
): string {
const sessionPanel = api.getPanel(`session:${sessionId}`);
const resolved = sessionPanel?.group?.id ?? centerGroupId;
return resolved;
}
/**
* Auto-add the PR detail panel to the center group when the active task
* has an associated pull request. The panel is added as a background tab
* (the session/agent tab stays focused).
*
* Dismissal is persisted to sessionStorage: if the user closes the PR panel,
* it won't be re-added for that session — even after a page refresh.
*/
export function useAutoPRPanel() {
const taskId = useAppStore((s) => s.tasks.activeTaskId);
const sessionId = useAppStore((s) => s.tasks.activeSessionId);
const hasPR = useAppStore((s) => {
const tid = s.tasks.activeTaskId;
return tid ? (s.taskPRs.byTaskId[tid]?.length ?? 0) > 0 : false;
});
const hasApi = useDockviewStore((s) => !!s.api);
useEffect(() => {
if (!taskId || !hasApi || !sessionId) return;
requestAnimationFrame(() => {
requestAnimationFrame(() => {
const api = useDockviewStore.getState().api;
if (!api) return;
const decisionParams = {
hasPR,
panelExists: !!api.getPanel("pr-detail"),
isRestoringLayout: useDockviewStore.getState().isRestoringLayout,
isMaximized: useDockviewStore.getState().preMaximizeLayout !== null,
wasOffered: wasPRPanelOffered(sessionId),
};
const decision = shouldAutoAddPRPanel(decisionParams);
if (decision === "remove") {
api.getPanel("pr-detail")?.api.close();
return;
}
if (decision === "add") {
const targetGroupId = resolvePRPanelTargetGroup(
api,
sessionId,
useDockviewStore.getState().centerGroupId,
);
focusOrAddPanel(api, {
id: "pr-detail",
component: "pr-detail",
title: "Pull Request",
position: { referenceGroup: targetGroupId },
inactive: true,
});
markPRPanelOffered(sessionId);
return;
}
// "none" — panel already present or conditions not met.
// Mark as offered if the panel exists (e.g. restored from saved layout).
if (hasPR && api.getPanel("pr-detail")) {
markPRPanelOffered(sessionId);
}
});
});
}, [taskId, hasPR, hasApi, sessionId]);
}
function resolveInitialPosition(api: DockviewApi): AddPanelOptions["position"] {
const { centerGroupId } = useDockviewStore.getState();
const centerGroupExists = centerGroupId && api.groups.some((g) => g.id === centerGroupId);
if (centerGroupExists) return { referenceGroup: centerGroupId };
const sb = api.getPanel("sidebar");
if (sb) return { direction: "right" as const, referencePanel: "sidebar" };
return undefined;
}
function ensureSessionPanel(
api: DockviewApi,
sessionId: string,
position: AddPanelOptions["position"],
inactive: boolean,
createdSet: Set<string>,
): void {
if (api.getPanel(`session:${sessionId}`)) {
createdSet.add(sessionId);
return;
}
api.addPanel({
id: `session:${sessionId}`,
component: "chat",
tabComponent: "sessionTab",
title: "Agent",
params: { sessionId },
position,
inactive,
});
createdSet.add(sessionId);
}
/**
* Close session panels that no longer belong to the active task.
*
* Iterates `api.panels` (not `createdSet`) as the source of truth — `createdSet`
* is unreliable because session panels can enter dockview via `tryRestoreLayout`
* /`fromJSON` (never going through `ensureSessionPanel`) and can leave via
* external removals like the right-click delete handler. Trusting it caused
* tabs from a previous task to leak into the current task's view.
*/
export function reconcileRemovedSessionPanels(
api: DockviewApi,
createdSet: Set<string>,
currentSessionIds: string[],
keepSessionId: string,
): void {
const currentIds = new Set(currentSessionIds);
const removed: string[] = [];
// Snapshot before iterating: closing a panel can mutate `api.panels`
// synchronously, which would skip elements in a `for...of` over the live
// array. Matches the pattern in `removeEphemeralPanels`.
for (const panel of [...api.panels]) {
if (!panel.id.startsWith("session:")) continue;
const sid = panel.id.slice("session:".length);
if (sid === keepSessionId) continue;
if (currentIds.has(sid)) continue;
try {
panel.api.close();
removed.push(panel.id);
} catch {
/* already gone */
}
createdSet.delete(sid);
}
if (IS_DEBUG) {
const sessionPanels = api.panels.filter((p) => p.id.startsWith("session:"));
debug("reconcileRemovedSessionPanels", {
keepSessionId,
currentSessionIds,
liveSessionPanelIds: sessionPanels.map((p) => p.id),
removed,
createdSetAfter: Array.from(createdSet),
});
}
// Drop any remaining stale entries (panel already removed externally, e.g.
// by the right-click delete handler) so the ref stays in sync with reality.
for (const sid of [...createdSet]) {
if (sid === keepSessionId) continue;
if (currentIds.has(sid)) continue;
createdSet.delete(sid);
}
}
const EMPTY_SESSION_IDS_KEY = "";
/**
* Drop the generic "chat" placeholder once a real session is active.
* Skips removal in maximized state to preserve the saved maximize layout.
* Returns true when callers should continue ensuring session panels;
* false when the maximized state intentionally suppresses them.
*/
function prepareLayoutForSessionPanels(api: DockviewApi): boolean {
const preMaximizeLayout = useDockviewStore.getState().preMaximizeLayout;
const chatPanel = api.getPanel("chat");
if (chatPanel && !preMaximizeLayout) {
api.removePanel(chatPanel);
}
// In maximized state, session panels are intentionally absent from the
// layout — they'll be restored when the user exits maximize.
return preMaximizeLayout === null;
}
/**
* Decide whether to force-activate the session panel after it (and any
* sibling tabs) have been ensured.
*
* - It was just created by `ensureSessionPanel` (no prior dockview state
* to honor), or
* - The hook is mounting for the first time (initial page load) — preserve
* the long-standing behavior of focusing the agent tab so the chat is
* visible immediately, even when a saved layout had a different center
* tab active, or
* - The user switched sessions within the same task (intra-task switch
* where dockview hasn't re-activated the new session for us).
*
* After an env (task) switch the prev refs are populated and the task
* changed — `restoreSavedActiveViews` has already applied the saved active
* panel for the incoming task, so calling setActive here would override it
* and force the agent tab on top of whatever the user had focused.
*/
function shouldActivateSessionPanel(args: {
sessionPanelExistedBefore: boolean;
prevTaskId: string | null;
prevSessionId: string | null;
currentTaskId: string | null;
currentSessionId: string;
}): boolean {
const { sessionPanelExistedBefore, prevTaskId, prevSessionId, currentTaskId, currentSessionId } =
args;
if (!sessionPanelExistedBefore) return true;
const isFirstMount = prevTaskId === null && prevSessionId === null;
if (isFirstMount) return true;
const taskChanged = prevTaskId !== currentTaskId;
const sessionChanged = prevSessionId !== currentSessionId;
return sessionChanged && !taskChanged;
}
/**
* Open a dockview tab for every session of the active task and keep them in sync
* with the store.
*
* - On mount / session-list change: create a panel for each session if one does
* not exist yet. Siblings are added adjacent to the active session's group so
* they show up as tabs in the center area.
* - The panel for `effectiveSessionId` is the active tab; the rest are added
* inactive so switching the active session doesn't blow focus out of the
* already-open layout.
* - Deleted sessions have their panels closed.
*/
export function useAutoSessionTab(effectiveSessionId: string | null) {
const sessionTabCreatedRef = useRef<Set<string>>(new Set());
const prevTaskIdRef = useRef<string | null>(null);
const prevSessionIdRef = useRef<string | null>(null);
const appStore = useAppStoreApi();
// Key-based dependency so the effect re-runs when the task's session list
// changes (add/remove). Inside the effect we re-read the real array from
// the store so we don't capture a stale reference.
const sessionIdsKey = useAppStore((s) => {
const tid = s.tasks.activeTaskId;
if (!tid) return EMPTY_SESSION_IDS_KEY;
const list = s.taskSessionsByTask.itemsByTaskId[tid];
if (!list || list.length === 0) return EMPTY_SESSION_IDS_KEY;
return list.map((ss) => ss.id).join(",");
});
useEffect(() => {
const api = useDockviewStore.getState().api;
if (!api) return;
// Re-read the current session list straight from the store so we iterate
// the live array (sessionIdsKey change is what gets us here).
const tid = appStore.getState().tasks.activeTaskId;
const currentSessions = tid
? (appStore.getState().taskSessionsByTask.itemsByTaskId[tid] ?? [])
: [];
const currentSessionIds = currentSessions.map((s) => s.id);
// Always reconcile removed panels — even when effectiveSessionId is null
// (e.g. all sessions deleted) so orphaned tabs are closed.
reconcileRemovedSessionPanels(
api,
sessionTabCreatedRef.current,
currentSessionIds,
effectiveSessionId ?? "",
);
if (!effectiveSessionId) return;
// Don't create a panel for a session that no longer exists in the store —
// guards against a race where removeTaskSession fires before the active
// session is switched, which would cause the deleted session's panel to
// be re-created by ensureSessionPanel.
if (!currentSessionIds.includes(toSessionId(effectiveSessionId))) return;
if (!prepareLayoutForSessionPanels(api)) {
sessionTabCreatedRef.current.add(effectiveSessionId);
return;
}
const initialPosition = resolveInitialPosition(api);
// Active panel first so its group becomes the anchor for siblings.
const sessionPanelExistedBefore = !!api.getPanel(`session:${effectiveSessionId}`);
ensureSessionPanel(
api,
effectiveSessionId,
initialPosition,
false,
sessionTabCreatedRef.current,
);
const activePanel = api.getPanel(`session:${effectiveSessionId}`);
if (activePanel) {
const shouldActivate = shouldActivateSessionPanel({
sessionPanelExistedBefore,
prevTaskId: prevTaskIdRef.current,
prevSessionId: prevSessionIdRef.current,
currentTaskId: tid ?? null,
currentSessionId: effectiveSessionId,
});
if (shouldActivate) {
activePanel.api.setActive();
}
useDockviewStore.setState({ centerGroupId: activePanel.group.id });
}
const siblingAnchor: AddPanelOptions["position"] = activePanel
? { referenceGroup: activePanel.group.id }
: initialPosition;
for (const sid of currentSessionIds) {
if (sid === effectiveSessionId) continue;
ensureSessionPanel(api, sid, siblingAnchor, true, sessionTabCreatedRef.current);
}
prevTaskIdRef.current = tid ?? null;
prevSessionIdRef.current = effectiveSessionId;
}, [effectiveSessionId, sessionIdsKey, appStore]);
}