# All files / src/components/display EventStream.tsx

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     import { useCallback, useEffect, useMemo, useRef, useState, type JSX, type ReactNode } from "react";
    import { AlertTriangle, ArrowDown, ArrowUp } from "lucide-react";
    import { AnimatePresence, motion, useReducedMotion } from "motion/react";
    import { EventRenderer } from "./EventRenderer.js";
    import { EventHoverRow } from "./EventHoverRow.js";
    import { FloatingActionBar } from "./FloatingActionBar.js";
    import { SessionPicker } from "./SessionPicker.js";
    import { ConfirmDialog } from "./ConfirmDialog.js";
    import { Tooltip } from "./Tooltip.js";
    import { useSmartScroll } from "../../hooks/useSmartScroll.js";
    import { useEventSelection } from "../../hooks/useEventSelection.js";
    import {
      isContentBearingEvent,
      getEventCopyText,
      formatEventsAsMarkdown,
      formatForwardEnvelope,
    } from "../../utils/eventContent.js";
    import type { ToastVariant } from "../../context/ToastContext.js";
    import { ICON_MD } from "../../utils/iconSize.js";
    import type { DisplayEvent } from "../../utils/sessionEvents.js";
    import type { Session, Environment, PersonaData, SessionEvent } from "../../hooks/types.js";
    import styles from "./EventStream.module.scss";

    /** Byte size threshold above which a large-message confirmation is shown (10 KB). */
    const LARGE_MESSAGE_THRESHOLD_BYTES: number = 10 * 1024;

    /** Active session statuses eligible as forward targets. */
    const ACTIVE_STATUSES: ReadonlySet<string> = new Set(["running", "idle"]);

    /** Build a descriptive label for the selection checkbox aria-label. */
    function buildCheckboxLabel(event: SessionEvent): string {
      const time = new Date(event.timestamp).toLocaleTimeString();
      switch (event.eventType) {
        case "text":
        case "output":
          return `Select message from assistant at ${time}`;
        case "user_input":
          return `Select message from user at ${time}`;
        case "tool_result":
        case "tool_use":
          return `Select tool event at ${time}`;
        case "error":
          return `Select error at ${time}`;
        default:
          return `Select event at ${time}`;
      }
    }

    /** localStorage key for persisting the direction preference. */
    const DIRECTION_STORAGE_KEY: string = "grackle-stream-direction";

    /** Read initial direction from localStorage. */
    function readStoredDirection(): boolean {
      try {
        return localStorage.getItem(DIRECTION_STORAGE_KEY) === "reversed";
      } catch {
        return false;
      }
    }

    /** Overflow warning banner shown when events exceed the in-memory cap. */
    function EventOverflowBanner({ eventsDropped }: { eventsDropped: number }): JSX.Element {
      if (eventsDropped <= 0) {
        return <></>;
      }
      return (
        <div className={styles.eventOverflowWarning} role="alert">
          <AlertTriangle size={ICON_MD} aria-hidden="true" /> {eventsDropped.toLocaleString()} older
          event{eventsDropped === 1 ? "" : "s"} were dropped — only the most recent 5,000 are shown.
          Full history is available in the session log.
        </div>
      );
    }

    /** Props for the EventStream component. */
    interface EventStreamProps {
      /** Events to render. */
      events: DisplayEvent[];
      /** Number of events dropped due to the in-memory cap. */
      eventsDropped: number;
      /** Custom empty state content (e.g., CTA button or waiting message). */
      emptyState?: ReactNode;
      /** Toast callback for copy feedback. If omitted, no toast is shown. */
      onShowToast?: (message: string, variant?: ToastVariant) => void;
      /** All known sessions (used to build the forward-target picker). */
      sessions?: Session[];
      /** ID of the session currently being viewed (excluded from forward picker). */
      currentSessionId?: string;
      /** All known environments (used to look up display names in the forward picker). */
      environments?: Environment[];
      /** All known personas (used to show persona name in the session picker). */
      personas?: PersonaData[];
      /**
       * Called when the user forwards selected events to another session.
       * Receives the target session ID and the formatted envelope text.
       */
      onForward?: (sessionId: string, text: string) => Promise<void>;
      /** Sandbox proxy origin URL for rendering MCP Apps widget events. */
      sandboxProxyUrl?: string;
      /**
       * Open a file in the live-docs pane (#1396). Wired by the page to
       * `documents.openDocument` with the environment bound. When provided,
       * `file://` links and tool-call file paths in the stream become clickable.
       */
      onOpenDocument?: (uri: string) => void;
    }

    /**
     * Scrollable event stream with smart auto-scroll, direction toggle,
     * animated entry for new events, hover actions, and multi-select mode.
     */
    export function EventStream({
      events,
      eventsDropped,
      emptyState,
      onShowToast,
      sessions,
      currentSessionId,
      environments,
      personas,
      onForward,
      sandboxProxyUrl,
      onOpenDocument,
    }: EventStreamProps): JSX.Element {
      const scrollRef = useRef<HTMLDivElement>(null);
      const [isReversed, setIsReversed] = useState(readStoredDirection);
      const shouldReduceMotion = useReducedMotion();

      // Forward flow state
      const [showSessionPicker, setShowSessionPicker] = useState(false);
      const [confirmLargeMessage, setConfirmLargeMessage] = useState(false);
      const [pendingForward, setPendingForward] = useState<
        { sessionId: string; text: string } | undefined
      >(undefined);

      // Multi-select state
      const selection = useEventSelection({
        events,
        formatForClipboard: formatEventsAsMarkdown,
      });

      // Count of selectable events (for floating action bar)
      const totalSelectable = useMemo(() => events.filter(isContentBearingEvent).length, [events]);

      // Active sessions that can receive a forwarded message (excluding current)
      const forwardTargets = useMemo<Session[]>(() => {
        if (!sessions) {
          return [];
        }
        return sessions.filter((s) => ACTIVE_STATUSES.has(s.status) && s.id !== currentSessionId);
      }, [sessions, currentSessionId]);

      const displayEvents = useMemo(() => {
        if (!isReversed) {
          return events;
        }
        return [...events].reverse();
      }, [events, isReversed]);

      const { isAtAnchor, scrollToAnchor } = useSmartScroll({
        scrollRef,
        contentLength: events.length,
        isReversed,
        paused: selection.isSelecting,
      });

      const handleToggleDirection = (): void => {
        const next = !isReversed;
        setIsReversed(next);
        try {
          localStorage.setItem(DIRECTION_STORAGE_KEY, next ? "reversed" : "default");
        } catch {
          /* storage unavailable */
        }
      };

      // Escape key exits selection mode, but not while a modal is open
      // (the modal's own Escape handler takes priority)
      useEffect(() => {
        if (!selection.isSelecting) {
          return;
        }
        const handler = (e: KeyboardEvent): void => {
          Iif (e.key === "Escape" && !showSessionPicker && !confirmLargeMessage) {
            selection.cancelSelection();
          }
        };
        window.addEventListener("keydown", handler);
        return () => {
          window.removeEventListener("keydown", handler);
        };
      }, [selection.isSelecting, selection.cancelSelection, showSessionPicker, confirmLargeMessage]);

      // Copy handler for the floating action bar
      const handleCopySelected = useCallback(async () => {
        const ok = await selection.copySelected();
        Iif (ok) {
          onShowToast?.(
            `Copied ${selection.selectedCount} message${selection.selectedCount === 1 ? "" : "s"} to clipboard`,
            "success",
          );
        }
      }, [selection, onShowToast]);

      /** Build the sorted list of selected DisplayEvents in chronological order. */
      const getSelectedEvents = useCallback((): DisplayEvent[] => {
        const sorted = [...selection.selectedIndices].sort((a, b) => a - b);
        return sorted.filter((i) => i < events.length).map((i) => events[i]);
      }, [selection.selectedIndices, events]);

      /**
       * Returns a human-readable label for a session by its ID.
       * Falls back to "this session" when sessionId is undefined/empty.
       */
      const getSessionLabel = useCallback(
        (sessionId: string | undefined): string => {
          Iif (!sessionId) {
            return "this session";
          }
          const session = sessions?.find((s) => s.id === sessionId);
          Iif (!session) {
            return sessionId.slice(0, 8);
          }
          const env = environments?.find((e) => e.id === session.environmentId);
          return env?.displayName ?? session.environmentId.slice(0, 8);
        },
        [sessions, environments],
      );

      /** Execute the actual forward after all confirmations. */
      const executeForward = useCallback(
        async (sessionId: string, text: string) => {
          Iif (!onForward) {
            return;
          }
          const targetLabel = getSessionLabel(sessionId);
          try {
            await onForward(sessionId, text);
            const count = selection.selectedCount;
            onShowToast?.(
              `Forwarded ${count} message${count === 1 ? "" : "s"} to ${targetLabel}`,
              "success",
            );
            selection.cancelSelection();
          } catch {
            onShowToast?.("Failed to forward messages", "error");
          }
        },
        [onForward, getSessionLabel, onShowToast, selection],
      );

      /** Called when the user picks a target session in the picker. */
      const handlePickSession = useCallback(
        (sessionId: string) => {
          setShowSessionPicker(false);

          const selectedEvents = getSelectedEvents();
          const sourceLabel = getSessionLabel(currentSessionId);
          const envelope = formatForwardEnvelope(sourceLabel, selectedEvents);

          Iif (new TextEncoder().encode(envelope).length > LARGE_MESSAGE_THRESHOLD_BYTES) {
            setPendingForward({ sessionId, text: envelope });
            setConfirmLargeMessage(true);
            return;
          }

          executeForward(sessionId, envelope).catch(() => {});
        },
        [getSelectedEvents, getSessionLabel, currentSessionId, executeForward],
      );

      const handleConfirmLargeMessage = useCallback(() => {
        setConfirmLargeMessage(false);
        Iif (pendingForward) {
          executeForward(pendingForward.sessionId, pendingForward.text).catch(() => {});
          setPendingForward(undefined);
        }
      }, [pendingForward, executeForward]);

      const handleCancelLargeMessage = useCallback(() => {
        setConfirmLargeMessage(false);
        setPendingForward(undefined);
      }, []);

      const animationDuration = shouldReduceMotion ? 0 : 0.2;
      const enterY = isReversed ? -8 : 8;

      const largeMessageSizeKb = pendingForward
        ? Math.round(new TextEncoder().encode(pendingForward.text).length / 1024)
        : 0;

      return (
        <div className={styles.wrapper}>
          {/* Direction toggle */}
          <div className={styles.toolbar}>
            <Tooltip text={isReversed ? "Showing newest first" : "Showing oldest first"}>
              <button
                className={styles.directionToggle}
                onClick={handleToggleDirection}
                aria-label={isReversed ? "Switch to newest at bottom" : "Switch to newest at top"}
                data-testid="direction-toggle"
              >
                {isReversed ? (
                  <ArrowDown size={ICON_MD} aria-hidden="true" />
                ) : (
                  <ArrowUp size={ICON_MD} aria-hidden="true" />
                )}
              </button>
            </Tooltip>
          </div>

          {/* Scroll container */}
          <div
            ref={scrollRef}
            className={`${styles.scrollContainer} ${selection.isSelecting ? styles.selectingPadding : ""}`}
            data-testid="event-stream-scroll"
          >
            {events.length === 0 && emptyState}
            <EventOverflowBanner eventsDropped={eventsDropped} />
            <AnimatePresence initial={false}>
              {displayEvents.map((event, displayIndex) => {
                // Use original index for stable keys regardless of direction
                const originalIndex = isReversed ? events.length - 1 - displayIndex : displayIndex;
                return (
                  <motion.div
                    key={`${event.sessionId}-${event.timestamp}-${originalIndex}`}
                    initial={shouldReduceMotion ? false : { opacity: 0, y: enterY }}
                    animate={{ opacity: 1, y: 0 }}
                    transition={{ duration: animationDuration, ease: "easeOut" }}
                  >
                    <EventHoverRow
                      copyText={getEventCopyText(event)}
                      isContentBearing={isContentBearingEvent(event)}
                      isSelecting={selection.isSelecting}
                      isSelected={selection.selectedIndices.has(originalIndex)}
                      checkboxLabel={buildCheckboxLabel(event)}
                      onSelect={() => {
                        selection.enterSelectionMode(originalIndex);
                      }}
                      onToggle={(shiftKey) => {
                        selection.toggleEvent(originalIndex, shiftKey);
                      }}
                      onCopied={() => {
                        onShowToast?.("Copied to clipboard", "success");
                      }}
                    >
                      <EventRenderer
                        event={event}
                        toolUseCtx={event.toolUseCtx}
                        settled={event.settled}
                        sandboxProxyUrl={sandboxProxyUrl}
                        onOpenDocument={onOpenDocument}
                      />
                    </EventHoverRow>
                  </motion.div>
                );
              })}
            </AnimatePresence>
          </div>

          {/* Floating action bar for multi-select mode */}
          <AnimatePresence>
            {selection.isSelecting && (
              <FloatingActionBar
                selectedCount={selection.selectedCount}
                totalSelectable={totalSelectable}
                onSelectAll={selection.selectAll}
                onDeselectAll={selection.deselectAll}
                onCopy={() => {
                  handleCopySelected().catch(() => {});
                }}
                onForward={
                  onForward !== undefined
                    ? () => {
                        setShowSessionPicker(true);
                      }
                    : undefined
                }
                forwardDisabled={forwardTargets.length === 0}
                onCancel={selection.cancelSelection}
              />
            )}
          </AnimatePresence>

          {/* Session picker for forwarding */}
          <SessionPicker
            isOpen={showSessionPicker}
            sessions={forwardTargets}
            environments={environments ?? []}
            personas={personas}
            onSelect={handlePickSession}
            onCancel={() => {
              setShowSessionPicker(false);
            }}
          />

          {/* Large message confirmation */}
          <ConfirmDialog
            isOpen={confirmLargeMessage}
            title="Send large message?"
            description={`This will forward a large message (${largeMessageSizeKb} KB). Continue?`}
            confirmLabel="Send"
            onConfirm={handleConfirmLargeMessage}
            onCancel={handleCancelLargeMessage}
          />

          {/* Floating "scroll to anchor" button */}
          <AnimatePresence>
            {!isAtAnchor && (
              <motion.button
                className={`${styles.scrollToAnchor} ${isReversed ? styles.scrollToAnchorTop : styles.scrollToAnchorBottom}`}
                onClick={scrollToAnchor}
                initial={{ opacity: 0, scale: 0.9 }}
                animate={{ opacity: 1, scale: 1 }}
                exit={{ opacity: 0, scale: 0.9 }}
                transition={{ duration: 0.15 }}
                aria-label="Scroll to latest"
                data-testid="scroll-to-anchor"
              >
                {isReversed ? (
                  <ArrowUp size={ICON_MD} aria-hidden="true" />
                ) : (
                  <ArrowDown size={ICON_MD} aria-hidden="true" />
                )}{" "}
                New events
              </motion.button>
            )}
          </AnimatePresence>
        </div>
      );
    }