/**
 * @file WorkspaceHome — what `/workspace?lane=<id>` opens on, shaped like a
 * Claude Desktop project page: the name, a prompt box that starts a NEW
 * session in the first free slot (0–9, `POST /api/lanes/:id/start`) and
 * then opens it (`&run=<runId>`) — the one place a session starts WITH a
 * prompt (the session view's tab bar `+` only starts a bare CLI or a shell,
 * `ConsoleTabs.tsx`). Inside
 * the box, like Claude Desktop's: AI (the session's own tool, the workspace's
 * by default) and one Model chip (`ModelMenu`: the tool's own list or the
 * proxy's models, plus Effort); under it the quieter choices — AI Proxy
 * (Native or a profile), Permission (Claude's mode, Codex's sandbox/approval,
 * a catalog tool's bypass) and Local / New worktree — the workspace's Recents — the sessions it
 * owns and has not archived (`?lane=&archived=0`, with each one's state dot,
 * **Show more** past the first page, and the sidebar row's Rename/Archive in
 * its right-click menu), then the archived ones folded with Unarchive; a live session opens its pane,
 * any other its conversation (`&session=`, `SessionReplay`), nothing is resumed — and on the right its context: Instructions, Memory (read-only), Context files and
 * Folders (`GET/PUT/POST/DELETE /api/lanes/:id/sources…`, see
 * server/lib/lane-sources.js). Folder suggestions are the repo's untracked
 * worktrees from `GET /api/projects`, filtered by Settings → Worktrees.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { Checkbox } from "../Checkbox";
import { copyText } from "../../lib/clipboard";
import { isSubmitEnter } from "../../lib/keys";
import { confirmDialog } from "../../lib/confirm";
import { useDialog } from "../../hooks/useDialog";
import { useEffect, useRef, useState } from "react";
import { useTranslation } from "react-i18next";
import { useNavigate } from "react-router-dom";
import {
  ArchiveRestore,
  ShieldAlert,
  FileText,
  Folder,
  GitBranch,
  MoreHorizontal,
  Pencil,
  ArrowUp,
  Plus,
  X,
} from "lucide-react";
import {
  api,
  type CodexApproval,
  type CodexSandbox,
  type EffortLevel,
  type LaneMemoryFile,
  type LaneSource,
  type LaneSourcesView,
  type ModelChoice,
  type PermissionMode,
  type RunHandle,
} from "../../lib/api";
import type { Lane, Project, Session } from "../../lib/types";
import { fmtCost, timeAgo } from "../../lib/format";
import { useAiTools } from "../../hooks/useAiTools";
import { useProjectTreePrefs } from "../../lib/projectTreePrefs";
import { ModelMenu, PromptEditor, promptWithImages, type PromptImage } from "../run/RunSetup";
import { AiToolIcon } from "../AiToolIcon";
import { ProxyPicker, proxyArg, useAiProxies, useSessionProxy } from "../run/ProxyPicker";
import { Select } from "../Select";
import { MarkdownPreview } from "../MarkdownPreview";
import { WorkspaceRowMenu, type WorkspaceMenuAction } from "./WorkspaceRowMenu";
import { workspaceName } from "./WorkspaceRow";
import { SessionMenu } from "./SessionMenu";
import { ContextMenu, MenuItem, MenuSeparator, menuPoint, useContextMenu } from "../ContextMenu";
import {
  liveRunFor,
  SessionFold,
  sessionDot,
  sessionDotLabel,
  sessionWorktreeName,
  useSessionPage,
} from "./WorkspaceSessionList";

export {
  freeSlot,
  laneOfRun,
  paneRunId,
  startInFreeTab,
  startInFreeTabDetailed,
} from "./startSession";
import { startInFreeTab } from "./startSession";
import { PathPickButton } from "../PathPickButton";

function fmtBytes(n: number | null): string {
  if (!n) return "";
  if (n < 1024) return `${n} B`;
  if (n < 1024 * 1024) return `${Math.round(n / 1024)} KB`;
  return `${(n / 1024 / 1024).toFixed(1)} MB`;
}

/** Recents' page size; Show more adds another. */
const RECENT_PAGE = 30;

const message = (err: unknown) => (err instanceof Error ? err.message : String(err));

type HomeProps = Parameters<typeof HomeBody>[0];

/** Keyed by workspace: every piece of state below (a half-typed prompt, the
 *  model, an open folder form, a late upload's answer) belongs to ONE
 *  workspace, and the page swaps `lane` without unmounting. */
export function WorkspaceHome(props: HomeProps) {
  return <HomeBody key={props.lane.id} {...props} />;
}

function HomeBody({
  lane,
  onMenuAction,
  onRenamed,
}: {
  lane: Lane;
  /** Row-menu items the page carries out (its modals); rename is done here. */
  onMenuAction: (action: WorkspaceMenuAction) => void;
  /** Called after a rename, so the page re-reads the lane list. */
  onRenamed?: () => void;
}) {
  const { t } = useTranslation("lanes");
  const navigate = useNavigate();
  const aiTools = useAiTools();
  const prefs = useProjectTreePrefs();
  // The NEW session's AI tool — its own choice, the workspace's by default.
  const [tool, setTool] = useState(lane.tool);
  const entry = aiTools.byId(tool);
  const claude = tool === "claude";
  const codex = tool === "codex";
  // The half-typed prompt survives leaving the page or the workspace.
  const draftKey = `agenthub.workspace.draft.${lane.id}`;
  const [prompt, setPrompt] = useState(() => {
    try {
      return localStorage.getItem(draftKey) ?? "";
    } catch {
      return "";
    }
  });
  useEffect(() => {
    try {
      if (prompt) localStorage.setItem(draftKey, prompt);
      else localStorage.removeItem(draftKey);
    } catch {
      /* storage unavailable: the draft just does not survive */
    }
  }, [draftKey, prompt]);
  const [images, setImages] = useState<PromptImage[]>([]);
  const [proxy, setProxy] = useSessionProxy();
  const proxies = useAiProxies();
  // Claude and Codex, also before the catalog has loaded (as ProxyPicker).
  const proxyCapable = entry?.proxyCapable ?? (claude || codex);
  // A profile picked for a tool that can use one; its models replace the tool's own.
  const profile = proxyCapable
    ? (proxies?.find((r) => r.name === proxy && !r.builtin) ?? null)
    : null;
  const proxyModels: ModelChoice[] | undefined = profile
    ? [
        ...new Set(
          [profile.model, profile.models.opus, profile.models.sonnet, profile.models.haiku].filter(
            (m): m is string => !!m
          )
        ),
      ].map((id) => ({ id, label: id }))
    : undefined;
  // The tool's default model (also when the catalog arrives after mount); on
  // a proxy, the proxy's own default. A new tool or proxy drops the pick.
  const defaultModel = profile ? "" : (entry?.defaultModel ?? "");
  const [model, setModel] = useState(defaultModel);
  useEffect(() => setModel(defaultModel), [defaultModel, tool, profile?.name]);
  // Claude and Codex always take a model and an effort; a catalog tool a
  // model only when its file names the flag, an effort never.
  const hasModel = claude || codex || !!entry?.modelFlag;
  const [mode, setMode] = useState<PermissionMode>("auto");
  const [sandbox, setSandbox] = useState<CodexSandbox>("workspace-write");
  const [approval, setApproval] = useState<CodexApproval>("on-request");
  // Per session, never remembered.
  const [bypass, setBypass] = useState(false);
  const canBypass = !claude && !!entry?.bypass;
  const [effort, setEffort] = useState<EffortLevel>("");
  const hasEffort = claude || codex;
  // Claude Desktop's worktree toggle: the new session gets a git worktree of
  // its own (`claude --worktree`), made and cleaned up by Claude Code.
  const [inWorktree, setInWorktree] = useState(false);
  const [starting, setStarting] = useState(false);
  const startingRef = useRef(false);
  // An image still uploading: its path is not in the prompt yet.
  const [uploading, setUploading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [liveRuns, setLiveRuns] = useState<RunHandle[]>([]);
  const [sessions, setSessions] = useState<Session[] | null>(null);
  const [sessionTotal, setSessionTotal] = useState(0);
  const [recentLimit, setRecentLimit] = useState(RECENT_PAGE);
  // A Recents row being renamed (its session id) and the draft.
  const [renamingId, setRenamingId] = useState<string | null>(null);
  const [nameDraft, setNameDraft] = useState("");
  const [view, setView] = useState<LaneSourcesView | null>(null);
  const [editing, setEditing] = useState<string | null>(null);
  const [memory, setMemory] = useState<LaneMemoryFile[] | null>(null);
  const [memoryOpen, setMemoryOpen] = useState(false);
  const [memoryTab, setMemoryTab] = useState(0);
  const [folderOpen, setFolderOpen] = useState(false);
  const [folderPath, setFolderPath] = useState("");
  const [suggestions, setSuggestions] = useState<string[]>([]);
  const [menuAt, setMenuAt] = useState<{ x: number; y: number } | null>(null);
  const [title, setTitle] = useState<string | null>(null);
  const fileInput = useRef<HTMLInputElement>(null);
  const [ctxDrag, setCtxDrag] = useState(false);
  const addFiles = async (picked: File[]) => {
    for (const f of picked) {
      if (!(await run(() => api.lanes.addFile(lane.id, f)))) break;
    }
  };
  const memoryPanel = useRef<HTMLDivElement>(null);
  useDialog(memoryOpen && !!memory, memoryPanel, () => setMemoryOpen(false));
  const recentCtx = useContextMenu<Session>();
  const sourceCtx = useContextMenu<LaneSource>();

  // A new pane, a pane gone, a session id learned — all move these lane fields.
  const runKey = `${lane.status}:${lane.session_id}:${lane.run_id}`;
  // Bumped after a session is unarchived, so the lists re-read.
  const [version, setVersion] = useState(0);
  useEffect(() => {
    let live = true;
    api.run
      .list()
      .then((r) => live && setLiveRuns(r.items))
      .catch(() => undefined);
    api.sessions
      .list({ lane: lane.id, archived: false, limit: recentLimit })
      .then((r) => {
        if (!live) return;
        setSessions(r.sessions);
        setSessionTotal(r.total ?? r.sessions.length);
      })
      .catch(() => live && setSessions([]));
    return () => {
      live = false;
    };
  }, [lane.id, runKey, version, recentLimit]);
  const archived = useSessionPage(
    { lane: lane.id, archived: true, limit: 30 },
    `${runKey}:${version}`
  );

  useEffect(() => {
    let live = true;
    setView(null);
    setMemory(null);
    setEditing(null);
    setError(null);
    api.lanes
      .sources(lane.id)
      .then((v) => live && setView(v))
      .catch((err) => live && setError(message(err)));
    api.lanes
      .memory(lane.id)
      .then((r) => live && setMemory(r.files))
      .catch(() => live && setMemory([]));
    return () => {
      live = false;
    };
  }, [lane.id]);

  // The repository this workspace belongs to (Settings → Projects used to
  // show this): read once per visit, from the server's cached project list.
  const [project, setProject] = useState<Project | null>(null);
  useEffect(() => {
    let live = true;
    api.projects
      .list()
      .then(({ projects }) => {
        if (live) setProject(projects.find((p) => p.workspaces.includes(lane.id)) ?? null);
      })
      .catch(() => undefined);
    return () => {
      live = false;
    };
  }, [lane.id]);

  // Suggestions are read when the folder form opens, not on every visit.
  useEffect(() => {
    if (!folderOpen) return;
    let live = true;
    api.projects
      .list()
      .then(({ projects }) => {
        if (!live) return;
        const p = projects.find((x) => x.workspaces.includes(lane.id));
        const own = new Set((view?.sources ?? []).map((s) => s.path));
        setSuggestions(
          !p || !prefs.showUntracked
            ? []
            : p.worktrees
                .filter((w) => w.workspace_id === null && !own.has(w.path))
                .filter((w) => !(w.source && prefs.hideSources.includes(w.source)))
                .map((w) => w.path)
        );
      })
      .catch(() => undefined);
    return () => {
      live = false;
    };
  }, [folderOpen, lane.id, prefs.showUntracked, prefs.hideSources, view?.sources]);

  const run = async (fn: () => Promise<LaneSourcesView>) => {
    setError(null);
    try {
      setView(await fn());
      return true;
    } catch (err) {
      setError(message(err));
      return false;
    }
  };

  const text = promptWithImages(prompt, images);
  const start = async () => {
    // Enter reaches here past the disabled button: the same guards again.
    // A ref, not only the state: two Enters in one tick both read `starting` false.
    if (startingRef.current || uploading || !text) return;
    startingRef.current = true;
    setStarting(true);
    setError(null);
    try {
      const runId = await startInFreeTab(lane.id, {
        prompt: text,
        // Only a different tool is named: the workspace's own keeps starting
        // even after it was disabled in Settings.
        ...(tool !== lane.tool ? { tool } : {}),
        ...proxyArg(proxyCapable, proxy),
        ...(hasModel && model ? { model } : {}),
        ...(claude ? { permissionMode: mode } : {}),
        ...(codex ? { sandbox, approval } : {}),
        ...(canBypass && bypass ? { bypass: true } : {}),
        ...(hasEffort && effort ? { effort } : {}),
        ...(claude && inWorktree && project?.root ? { worktree: true } : {}),
      });
      setPrompt("");
      images.forEach((i) => i.url && URL.revokeObjectURL(i.url));
      setImages([]);
      navigate(`/workspace?lane=${lane.id}&run=${encodeURIComponent(runId)}`);
    } catch (err) {
      setError(message(err));
    } finally {
      startingRef.current = false;
      setStarting(false);
    }
  };

  // The sidebar row's Rename and Archive, for a Recents row.
  const patchSession = async (s: Session, body: { name?: string; archived?: boolean }) => {
    try {
      await api.sessions.patch(s.id, body);
      setVersion((v) => v + 1);
    } catch (err) {
      setError(message(err));
    }
  };
  const archiveSession = async (s: Session) => {
    const live = !!liveRunFor(lane, liveRuns, s.id);
    const wt = sessionWorktreeName(lane, s);
    const ok = await confirmDialog(
      wt && !live
        ? {
            title: t("tree.archiveWorktreeTitle"),
            message: t("tree.archiveWorktreeBody", { name: wt }),
            confirmLabel: t("tree.archiveWorktreeConfirm"),
          }
        : live
          ? {
              title: t("tree.archiveLiveTitle"),
              message: t("tree.archiveLiveBody"),
              confirmLabel: t("sessionMenu.archive"),
              destructive: false,
            }
          : {
              title: t("tree.archiveSession"),
              confirmLabel: t("sessionMenu.archive"),
              destructive: false,
            }
    );
    if (!ok) return;
    if (wt && !live) {
      try {
        await api.lanes.removeSessionWorktree(lane.id, s.id).catch((err: unknown) => {
          if ((err as { code?: string }).code !== "ENOWORKTREE") throw err;
        });
      } catch (err) {
        setError(message(err));
        return;
      }
    }
    await patchSession(s, { archived: true });
  };

  const openSession = (s: Session) => {
    const r = liveRunFor(lane, liveRuns, s.id);
    navigate(
      `/workspace?lane=${lane.id}&${r ? `run=${encodeURIComponent(r.id)}` : `session=${encodeURIComponent(s.id)}`}`
    );
  };

  // The tools a session may start on: installed and enabled, plus the
  // workspace's own whatever its state.
  const toolOptions = [
    ...new Set([
      lane.tool,
      ...aiTools.tools.filter((x) => x.installed && x.enabled).map((x) => x.id),
    ]),
  ];
  const danger =
    claude && mode === "bypassPermissions"
      ? t("run:hint.permissionWarning")
      : canBypass && bypass
        ? t("run:hint.bypassWarning", { tool: aiTools.label(tool) })
        : codex && sandbox === "danger-full-access"
          ? t("run:hint.sandboxWarning")
          : null;

  const files = (view?.sources ?? []).filter((s) => s.kind === "file");
  const folders = (view?.sources ?? []).filter((s) => s.kind === "folder");
  const name = workspaceName(lane);
  const card = "border-b border-border px-4 py-4 last:border-b-0";
  const iconBtn =
    "rounded p-1 text-fg-muted transition-colors hover:bg-surface-4 hover:text-fg-primary disabled:opacity-40";

  return (
    <div
      data-testid="workspace-home"
      className="mx-auto flex w-full max-w-6xl flex-wrap gap-8 py-2"
    >
      <div className="min-w-0 flex-1 basis-[28rem]">
        <p className="text-xs text-fg-muted">
          {t("home.breadcrumb")} / <span className="text-fg-secondary">{name}</span>
        </p>
        <div className="mt-3 flex items-center gap-2">
          {title === null ? (
            <h1
              title={lane.cwd}
              onContextMenu={(e) => setMenuAt(menuPoint(e))}
              className="min-w-0 flex-1 truncate text-2xl font-semibold text-fg-primary"
            >
              {name}
            </h1>
          ) : (
            <input
              data-testid="workspace-home-rename"
              aria-label={t("renameLabel")}
              autoFocus
              value={title}
              maxLength={200}
              onChange={(e) => setTitle(e.target.value)}
              onBlur={() => setTitle(null)}
              onKeyDown={async (e) => {
                if (e.key === "Escape") setTitle(null);
                if (!isSubmitEnter(e)) return;
                const next = title.trim();
                setTitle(null);
                if (next === (lane.title || "")) return;
                try {
                  await api.lanes.update(lane.id, { title: next });
                  onRenamed?.();
                } catch (err) {
                  setError(message(err));
                }
              }}
              className="min-w-0 flex-1 rounded border border-accent bg-surface-1 px-2 py-1 text-2xl font-semibold text-fg-primary"
            />
          )}
          <button
            type="button"
            data-testid="workspace-home-menu"
            aria-label={t("row.actions")}
            title={t("row.actions")}
            onClick={(e) => {
              const r = e.currentTarget.getBoundingClientRect();
              setMenuAt({ x: r.left - 200, y: r.bottom + 4 });
            }}
            className={iconBtn}
          >
            <MoreHorizontal className="h-5 w-5" />
          </button>
        </div>
        {project?.root && (
          <p
            data-testid="workspace-home-facts"
            className="mt-1 flex flex-wrap gap-x-3 font-mono text-[11px] text-fg-muted"
          >
            <span title={t("home.repoRoot")}>{project.root}</span>
            {project.worktrees.find((w) => w.main)?.branch && (
              <span title={t("home.mainBranch")}>
                {project.worktrees.find((w) => w.main)?.branch}
              </span>
            )}
            <span>{t("home.worktreeCount", { count: project.worktrees.length })}</span>
          </p>
        )}

        <div
          data-testid="workspace-home-composer"
          className="mt-5 rounded-2xl border border-border bg-surface-1 p-2 shadow-sm transition-colors focus-within:border-accent/50"
        >
          <PromptEditor
            value={prompt}
            onChange={setPrompt}
            onSubmit={() => void start()}
            placeholder={t("home.placeholder")}
            rows={3}
            slash={claude}
            fileCwd={lane.cwd}
            images={images}
            onImagesChange={setImages}
            onBusyChange={setUploading}
            bare
          />
          <div className="mt-1 flex items-center gap-1">
            <div data-testid="workspace-home-tool">
              <Select<string>
                variant="ghost"
                label={t("home.ai")}
                value={tool}
                onChange={(v) => {
                  setTool(v);
                  setBypass(false);
                }}
                options={toolOptions.map((id) => ({
                  value: id,
                  label: aiTools.label(id),
                  icon: (
                    <AiToolIcon
                      tool={{ id, label: aiTools.label(id) }}
                      className="h-4 w-4 !p-0.5"
                    />
                  ),
                }))}
              />
            </div>
            <div className="ml-auto flex items-center gap-1">
              {hasModel && (
                <ModelMenu
                  value={model}
                  onChange={setModel}
                  tool={tool}
                  choices={proxyModels}
                  {...(hasEffort ? { effort, onEffortChange: setEffort } : {})}
                />
              )}
              <button
                type="button"
                data-testid="workspace-home-start"
                onClick={() => void start()}
                disabled={starting || uploading || !text}
                aria-label={t("home.start")}
                title={t("home.start")}
                className="flex h-8 w-8 items-center justify-center rounded-full bg-accent-solid text-white transition-opacity hover:opacity-90 disabled:opacity-40"
              >
                <ArrowUp className="h-4 w-4" />
              </button>
            </div>
          </div>
        </div>
        {/* The session's quieter choices, under the box like Claude Desktop's. */}
        <div
          data-testid="workspace-home-options"
          className="mt-1.5 flex flex-wrap items-center gap-0.5 px-1"
        >
          <ProxyPicker
            variant="ghost"
            tool={tool}
            proxies={proxies}
            value={proxy}
            onChange={setProxy}
          />
          {claude && (
            <Select<PermissionMode>
              variant="ghost"
              label={t("run:fields.permissionMode")}
              value={mode}
              onChange={setMode}
              options={(
                [
                  ["auto", "Auto"],
                  ["acceptEdits", "AcceptEdits"],
                  ["default", "Default"],
                  ["plan", "Plan"],
                  ["bypassPermissions", "Bypass"],
                ] as const
              ).map(([value, key]) => ({
                value,
                label: t(`home.permission${key}`),
                hint: t(`run:fields.permission${key}`),
              }))}
            />
          )}
          {codex && (
            <>
              <Select<CodexSandbox>
                variant="ghost"
                label={t("run:fields.sandbox")}
                value={sandbox}
                onChange={setSandbox}
                options={[
                  { value: "read-only", label: t("run:fields.sandboxReadOnly") },
                  { value: "workspace-write", label: t("run:fields.sandboxWorkspaceWrite") },
                  { value: "danger-full-access", label: t("run:fields.sandboxFullAccess") },
                ]}
              />
              <Select<CodexApproval>
                variant="ghost"
                label={t("run:fields.approval")}
                value={approval}
                onChange={setApproval}
                options={[
                  { value: "on-request", label: t("run:fields.approvalOnRequest") },
                  { value: "never", label: t("run:fields.approvalNever") },
                ]}
              />
            </>
          )}
          {claude && project?.root && (
            <div data-testid="workspace-home-worktree">
              <Select<"local" | "worktree">
                variant="ghost"
                label={t("home.worktreeHint")}
                value={inWorktree ? "worktree" : "local"}
                onChange={(v) => setInWorktree(v === "worktree")}
                options={[
                  {
                    value: "local",
                    label: t("home.local"),
                    hint: t("home.localHint"),
                    icon: <Folder className="h-3.5 w-3.5" />,
                  },
                  {
                    value: "worktree",
                    label: t("home.worktree"),
                    hint: t("home.worktreeHint"),
                    icon: <GitBranch className="h-3.5 w-3.5" />,
                  },
                ]}
              />
            </div>
          )}
          {canBypass && (
            <span className="px-2">
              <Checkbox
                tone="danger"
                checked={bypass}
                onChange={setBypass}
                label={t("run:fields.bypass")}
                labelClassName="text-xs text-status-danger"
              />
            </span>
          )}
        </div>
        {danger && (
          <p className="mt-2 flex items-start gap-2 text-xs text-status-danger">
            <ShieldAlert className="mt-0.5 h-3.5 w-3.5 shrink-0" />
            {danger}
          </p>
        )}
        {error && (
          <p role="alert" className="mt-2 text-xs text-status-danger">
            {error}
          </p>
        )}

        <h2 className="mt-8 text-sm font-medium text-fg-muted">{t("home.recents")}</h2>
        {sessions !== null && sessions.length === 0 && (
          <p className="mt-2 text-sm text-fg-muted">{t("home.noRecents")}</p>
        )}
        <ul data-testid="workspace-recents" className="mt-2 divide-y divide-border/60">
          {(sessions ?? []).map((s) => {
            const live = !!liveRunFor(lane, liveRuns, s.id);
            if (renamingId === s.id) {
              return (
                <li key={s.id} className="py-1.5">
                  <input
                    data-testid={`workspace-recent-rename-${s.id}`}
                    aria-label={t("tree.renameSession")}
                    autoFocus
                    value={nameDraft}
                    maxLength={200}
                    onChange={(e) => setNameDraft(e.target.value)}
                    onBlur={() => setRenamingId(null)}
                    onKeyDown={(e) => {
                      if (e.key === "Escape") setRenamingId(null);
                      if (!isSubmitEnter(e)) return;
                      setRenamingId(null);
                      const name = nameDraft.trim();
                      if (name && name !== s.name) void patchSession(s, { name });
                    }}
                    className="w-full rounded border border-accent bg-surface-1 px-2 py-1 text-sm text-fg-primary"
                  />
                </li>
              );
            }
            return (
              <li key={s.id}>
                <button
                  type="button"
                  data-testid={`workspace-recent-${s.id}`}
                  data-live={live ? "true" : undefined}
                  onClick={() => openSession(s)}
                  onContextMenu={(e) => recentCtx.open(e, s)}
                  className="flex w-full items-center gap-3 py-2.5 text-left hover:bg-surface-3"
                >
                  <span
                    aria-hidden
                    className={`h-2 w-2 shrink-0 rounded-full ${sessionDot(s, live)}`}
                  />
                  <span className="sr-only">{t(`tree.state.${sessionDotLabel(s, live)}`)}</span>
                  <span className="min-w-0 flex-1 truncate text-sm text-fg-primary">
                    {s.name || s.id.slice(0, 8)}
                  </span>
                  {sessionWorktreeName(lane, s) && (
                    <span
                      title={t("tree.worktreeSession", { name: sessionWorktreeName(lane, s) })}
                      className="inline-flex shrink-0 items-center gap-1 font-mono text-[11px] text-fg-muted"
                    >
                      <GitBranch className="h-3 w-3" />
                      {sessionWorktreeName(lane, s)}
                    </span>
                  )}
                  {!!s.cost && s.cost > 0 && (
                    <span className="shrink-0 text-xs tabular-nums text-fg-muted">
                      {fmtCost(s.cost)}
                    </span>
                  )}
                  <span className="shrink-0 text-xs text-fg-muted">
                    {timeAgo(s.last_activity ?? s.started_at)}
                  </span>
                </button>
              </li>
            );
          })}
        </ul>
        {sessions !== null && sessionTotal > sessions.length && (
          <button
            type="button"
            data-testid="workspace-recents-more"
            onClick={() => setRecentLimit((n) => n + RECENT_PAGE)}
            className="mt-1 text-xs text-fg-muted hover:text-fg-primary"
          >
            {t("tree.showMore", { count: Math.min(sessionTotal - sessions.length, RECENT_PAGE) })}
          </button>
        )}
        <div className="mt-2">
          <SessionFold
            testId={`workspace-archived-${lane.id}`}
            page={archived}
            label={(count) => t("tree.archived", { count })}
            actionLabel={t("tree.unarchive")}
            actionIcon={<ArchiveRestore className="h-3.5 w-3.5" />}
            onAction={(s) => api.sessions.patch(s.id, { archived: false })}
            onDone={() => setVersion((v) => v + 1)}
            laneId={lane.id}
          />
        </div>
      </div>

      <aside
        data-testid="workspace-context"
        aria-label={t("home.contextPanel")}
        className="card w-80 shrink-0 self-start p-0"
      >
        {view && !view.supported && (
          <p className="border-b border-border px-4 py-3 text-xs text-status-warning">
            {t("home.unsupported", { tool: aiTools.label(lane.tool) })}
          </p>
        )}

        <section className={card}>
          <div className="flex items-center justify-between">
            <h3 className="text-sm font-medium text-fg-primary">{t("home.instructions")}</h3>
            {editing === null && (
              <button
                type="button"
                aria-label={t("home.edit")}
                title={t("home.edit")}
                onClick={() => setEditing(view?.instructions ?? "")}
                disabled={!view}
                className={iconBtn}
              >
                <Pencil className="h-3.5 w-3.5" />
              </button>
            )}
          </div>
          {editing === null ? (
            <p className="mt-1 line-clamp-3 whitespace-pre-wrap text-xs text-fg-muted">
              {view?.instructions || t("home.instructionsEmpty")}
            </p>
          ) : (
            <div className="mt-2 space-y-2">
              <textarea
                data-testid="workspace-instructions"
                aria-label={t("home.instructions")}
                autoFocus
                value={editing}
                maxLength={view?.maxInstructions}
                onChange={(e) => setEditing(e.target.value)}
                rows={6}
                className="w-full rounded border border-border bg-surface-1 p-2 text-xs text-fg-primary"
              />
              <div className="flex justify-end gap-2">
                <button
                  type="button"
                  onClick={() => setEditing(null)}
                  className="btn-ghost text-xs"
                >
                  {t("home.cancel")}
                </button>
                <button
                  type="button"
                  onClick={async () => {
                    if (await run(() => api.lanes.setInstructions(lane.id, editing)))
                      setEditing(null);
                  }}
                  className="btn-primary text-xs"
                >
                  {t("home.save")}
                </button>
              </div>
            </div>
          )}
        </section>

        <section className={card}>
          <div className="flex items-center justify-between">
            <h3 className="text-sm font-medium text-fg-primary">{t("home.memory")}</h3>
            <button
              type="button"
              onClick={() => {
                setMemoryTab(0);
                setMemoryOpen(true);
              }}
              disabled={!memory?.length}
              className="text-xs text-fg-secondary hover:text-fg-primary disabled:opacity-40"
            >
              {t("home.viewMemory")}
            </button>
          </div>
          <p className="mt-1 text-xs text-fg-muted">
            {memory?.length
              ? t("home.memoryCount", { count: memory.length })
              : t("home.memoryEmpty")}
          </p>
        </section>

        <section
          data-testid="workspace-context-files"
          className={`${card} ${ctxDrag ? "ring-2 ring-accent/50" : ""}`}
          // Files dragged in from the OS are added like the + button's pick.
          onDragOver={(e) => {
            if (!view || !e.dataTransfer.types.includes("Files")) return;
            e.preventDefault();
            e.dataTransfer.dropEffect = "copy";
            setCtxDrag(true);
          }}
          onDragLeave={(e) => {
            if (!e.currentTarget.contains(e.relatedTarget as Node | null)) setCtxDrag(false);
          }}
          onDrop={(e) => {
            setCtxDrag(false);
            if (!view || e.dataTransfer.files.length === 0) return;
            e.preventDefault();
            void addFiles([...e.dataTransfer.files]);
          }}
        >
          <div className="flex items-center justify-between">
            <h3 className="text-sm font-medium text-fg-primary">{t("home.context")}</h3>
            <button
              type="button"
              aria-label={t("home.addFile")}
              title={t("home.addFile")}
              onClick={() => fileInput.current?.click()}
              disabled={!view}
              className={iconBtn}
            >
              <Plus className="h-3.5 w-3.5" />
            </button>
            <input
              ref={fileInput}
              data-testid="workspace-file-input"
              type="file"
              multiple
              hidden
              onChange={(e) => {
                const picked = [...(e.target.files ?? [])];
                e.target.value = "";
                void addFiles(picked);
              }}
            />
          </div>
          {files.length === 0 ? (
            <button
              type="button"
              onClick={() => fileInput.current?.click()}
              className="mt-2 w-full rounded-lg border border-dashed border-border px-3 py-5 text-center text-xs text-fg-muted hover:border-border-light hover:text-fg-secondary"
            >
              {t("home.contextEmpty")}
            </button>
          ) : (
            <ul className="mt-2 space-y-1">
              {files.map((f) => (
                <li
                  key={f.id}
                  className="group flex items-center gap-2 text-xs"
                  onContextMenu={(e) => sourceCtx.open(e, f)}
                >
                  <FileText className="h-3.5 w-3.5 shrink-0 text-fg-muted" />
                  <span title={f.path} className="min-w-0 flex-1 truncate text-fg-secondary">
                    {f.name}
                  </span>
                  <span className="shrink-0 text-fg-muted">
                    {f.missing ? t("home.missing") : fmtBytes(f.size)}
                  </span>
                  <button
                    type="button"
                    aria-label={`${t("home.remove")} ${f.name}`}
                    onClick={() => void run(() => api.lanes.removeSource(lane.id, f.id))}
                    className={`${iconBtn} opacity-0 group-hover:opacity-100 focus:opacity-100`}
                  >
                    <X className="h-3 w-3" />
                  </button>
                </li>
              ))}
            </ul>
          )}
        </section>

        <section className={card}>
          <div className="flex items-center justify-between">
            <h3 className="text-sm font-medium text-fg-primary">{t("home.folder")}</h3>
            <button
              type="button"
              aria-label={t("home.addFolder")}
              title={t("home.addFolder")}
              onClick={() => setFolderOpen((v) => !v)}
              disabled={!view}
              className={iconBtn}
            >
              <Plus className="h-3.5 w-3.5" />
            </button>
          </div>
          <ul className="mt-2 space-y-1.5">
            <li className="flex items-start gap-2 text-xs">
              <Folder className="mt-0.5 h-3.5 w-3.5 shrink-0 text-fg-muted" />
              <span className="min-w-0">
                <span title={lane.cwd} className="block truncate text-fg-secondary">
                  {lane.cwd.split("/").filter(Boolean).pop() || lane.cwd}
                </span>
                <span className="block text-fg-muted">{t("home.ownFolder")}</span>
              </span>
            </li>
            {folders.map((f) => (
              <li
                key={f.id}
                className="group flex items-center gap-2 text-xs"
                onContextMenu={(e) => sourceCtx.open(e, f)}
              >
                <Folder className="h-3.5 w-3.5 shrink-0 text-fg-muted" />
                <span title={f.path} className="min-w-0 flex-1 truncate text-fg-secondary">
                  {f.name}
                  {f.missing && (
                    <span className="ml-1 text-status-warning">{t("home.missing")}</span>
                  )}
                </span>
                <button
                  type="button"
                  aria-label={`${t("home.remove")} ${f.name}`}
                  onClick={() => void run(() => api.lanes.removeSource(lane.id, f.id))}
                  className={`${iconBtn} opacity-0 group-hover:opacity-100 focus:opacity-100`}
                >
                  <X className="h-3 w-3" />
                </button>
              </li>
            ))}
          </ul>
          {folderOpen && (
            <form
              className="mt-3 space-y-2"
              onSubmit={async (e) => {
                e.preventDefault();
                if (await run(() => api.lanes.addFolder(lane.id, folderPath.trim()))) {
                  setFolderPath("");
                  setFolderOpen(false);
                }
              }}
            >
              <div className="flex gap-2">
                <input
                  data-testid="workspace-folder-input"
                  aria-label={t("home.folderPath")}
                  placeholder={t("home.folderPath")}
                  autoFocus
                  value={folderPath}
                  onChange={(e) => setFolderPath(e.target.value)}
                  className="min-w-0 flex-1 rounded border border-border bg-surface-1 px-2 py-1 font-mono text-[11px] text-fg-primary"
                />
                <PathPickButton start={folderPath || lane.cwd} onPick={setFolderPath} />
                <button type="submit" disabled={!folderPath.trim()} className="btn-ghost text-xs">
                  {t("home.add")}
                </button>
              </div>
              {suggestions.length > 0 && (
                <div>
                  <p className="text-[10px] uppercase tracking-wide text-fg-muted">
                    {t("home.suggested")}
                  </p>
                  <ul className="mt-1 space-y-0.5">
                    {suggestions.map((p) => (
                      <li key={p}>
                        <button
                          type="button"
                          onClick={() => setFolderPath(p)}
                          title={p}
                          className="w-full truncate rounded px-1 text-left font-mono text-[11px] text-fg-secondary hover:bg-surface-3"
                        >
                          {p}
                        </button>
                      </li>
                    ))}
                  </ul>
                </div>
              )}
            </form>
          )}
        </section>
      </aside>

      {memoryOpen && memory && (
        <div
          className="fixed inset-0 z-40 flex items-center justify-center bg-black/60 p-4"
          role="presentation"
          onClick={() => setMemoryOpen(false)}
        >
          <div
            ref={memoryPanel}
            role="dialog"
            aria-modal="true"
            aria-label={t("home.memory")}
            onClick={(e) => e.stopPropagation()}
            className="flex max-h-[85vh] w-full max-w-3xl flex-col rounded-xl border border-border bg-surface-1 p-5 shadow-xl"
          >
            <div className="mb-3 flex shrink-0 items-center justify-between">
              <h2 className="text-sm font-semibold text-fg-primary">{t("home.memory")}</h2>
              <button
                type="button"
                autoFocus
                aria-label={t("home.close")}
                onClick={() => setMemoryOpen(false)}
                className={iconBtn}
              >
                <X className="h-4 w-4" />
              </button>
            </div>
            <div
              role="tablist"
              aria-label={t("home.memory")}
              // Wraps, so every file is reachable without a horizontal wheel (a
              // hidden-scrollbar row cut the rest off); past ~3 rows it scrolls
              // with a visible bar. shrink-0: a long file must not squeeze it.
              className="mb-3 flex max-h-28 shrink-0 flex-wrap gap-1.5 overflow-y-auto border-b border-border/60 pb-2"
            >
              {memory.map((f, i) => (
                <button
                  key={f.path}
                  type="button"
                  role="tab"
                  id={`workspace-memory-tab-${i}`}
                  aria-controls="workspace-memory-panel"
                  tabIndex={i === memoryTab ? 0 : -1}
                  title={f.path}
                  aria-selected={i === memoryTab}
                  onClick={() => setMemoryTab(i)}
                  // APG tabs: arrows move (and select), one tab stop.
                  onKeyDown={(e) => {
                    const n = memory.length;
                    const to =
                      e.key === "ArrowRight"
                        ? (i + 1) % n
                        : e.key === "ArrowLeft"
                          ? (i - 1 + n) % n
                          : e.key === "Home"
                            ? 0
                            : e.key === "End"
                              ? n - 1
                              : null;
                    if (to === null) return;
                    e.preventDefault();
                    setMemoryTab(to);
                    document.getElementById(`workspace-memory-tab-${to}`)?.focus();
                  }}
                  className={`flex-shrink-0 whitespace-nowrap rounded-lg border px-3 py-1.5 font-mono text-xs transition-colors ${
                    i === memoryTab
                      ? "border-accent/30 bg-accent/15 text-accent"
                      : "border-border text-fg-secondary hover:bg-surface-3 hover:text-fg-primary"
                  }`}
                >
                  {f.label}
                </button>
              ))}
            </div>
            {memory[memoryTab] && (
              <div
                role="tabpanel"
                id="workspace-memory-panel"
                aria-labelledby={`workspace-memory-tab-${memoryTab}`}
                className="min-h-0 flex-1 overflow-y-auto"
              >
                <MarkdownPreview text={memory[memoryTab].content} />
              </div>
            )}
          </div>
        </div>
      )}

      {recentCtx.menu && (
        <SessionMenu
          x={recentCtx.menu.x}
          y={recentCtx.menu.y}
          laneId={lane.id}
          session={recentCtx.menu.item}
          run={liveRunFor(lane, liveRuns, recentCtx.menu.item.id)}
          onClose={recentCtx.close}
          onRename={() => {
            const s = recentCtx.menu!.item;
            setNameDraft(s.name || "");
            setRenamingId(s.id);
          }}
          onArchive={() => void archiveSession(recentCtx.menu!.item)}
        />
      )}
      {sourceCtx.menu && (
        <ContextMenu
          x={sourceCtx.menu.x}
          y={sourceCtx.menu.y}
          onClose={sourceCtx.close}
          testId={`workspace-source-menu-${sourceCtx.menu.item.id}`}
        >
          <MenuItem
            onSelect={() => {
              void copyText(sourceCtx.menu!.item.path);
              sourceCtx.close();
            }}
          >
            {t("menu.copyPath")}
          </MenuItem>
          <MenuSeparator />
          <MenuItem
            danger
            onSelect={() => {
              const id = sourceCtx.menu!.item.id;
              sourceCtx.close();
              void run(() => api.lanes.removeSource(lane.id, id));
            }}
          >
            {t("home.remove")}
          </MenuItem>
        </ContextMenu>
      )}
      {menuAt && (
        <WorkspaceRowMenu
          lane={lane}
          x={menuAt.x}
          y={menuAt.y}
          onClose={() => setMenuAt(null)}
          onAction={(a) => (a === "rename" ? setTitle(lane.title || "") : onMenuAction(a))}
        />
      )}
    </div>
  );
}