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* Selection state management for the multi-select feature in EventStream.
*
* Manages entering/exiting selection mode, toggling individual events,
* shift-click range selection, select all, and clipboard copy.
*
* @module
*/
import { useState, useRef, useCallback, useMemo } from "react";
import type { DisplayEvent } from "../utils/sessionEvents.js";
import { isContentBearingEvent } from "../utils/eventContent.js";
/** Options for the useEventSelection hook. */
export interface UseEventSelectionOptions {
/** All events currently in the stream. */
events: DisplayEvent[];
/** Formats events as text for the clipboard. */
formatForClipboard: (events: DisplayEvent[]) => string;
}
/** Return value of the useEventSelection hook. */
export interface UseEventSelectionReturn {
/** Whether selection mode is active. */
isSelecting: boolean;
/** Set of selected event indices (from the events array). */
selectedIndices: ReadonlySet<number>;
/** Number of selected events. */
selectedCount: number;
/** Enter selection mode, optionally selecting an initial event. */
enterSelectionMode: (initialIndex?: number) => void;
/** Exit selection mode and clear all selections. */
cancelSelection: () => void;
/** Toggle an event at the given index. When shiftKey is true, selects the range from the last-toggled anchor. */
toggleEvent: (index: number, shiftKey?: boolean) => void;
/** Select all content-bearing events. */
selectAll: () => void;
/** Deselect all events but stay in selection mode. */
deselectAll: () => void;
/** Copy selected events to clipboard. Returns true on success. */
copySelected: () => Promise<boolean>;
}
/**
* Hook that manages event selection state for the EventStream multi-select feature.
*
* The caller is responsible for rendering checkboxes, highlights, and action bars
* based on the returned state. The `copySelected` method uses `navigator.clipboard`
* and will return `false` in environments where the Clipboard API is unavailable.
*/
export function useEventSelection({
events,
formatForClipboard,
}: UseEventSelectionOptions): UseEventSelectionReturn {
const [isSelecting, setIsSelecting] = useState(false);
const [selectedIndices, setSelectedIndices] = useState<ReadonlySet<number>>(new Set());
/** Anchor index for shift-click range selection. */
const anchorRef = useRef<number | undefined>(undefined);
const selectedCount = useMemo(() => selectedIndices.size, [selectedIndices]);
const enterSelectionMode = useCallback((initialIndex?: number) => {
setIsSelecting(true);
if (initialIndex !== undefined) {
setSelectedIndices(new Set([initialIndex]));
anchorRef.current = initialIndex;
} else {
setSelectedIndices(new Set());
anchorRef.current = undefined;
}
}, []);
const cancelSelection = useCallback(() => {
setIsSelecting(false);
setSelectedIndices(new Set());
anchorRef.current = undefined;
}, []);
const toggleEvent = useCallback(
(index: number, shiftKey?: boolean) => {
if (shiftKey && anchorRef.current !== undefined) {
// Range selection: select all content-bearing events between anchor and index
const start = Math.min(anchorRef.current, index);
const end = Math.max(anchorRef.current, index);
setSelectedIndices((prev) => {
const next = new Set(prev);
for (let i = start; i <= end; i++) {
if (i < events.length && isContentBearingEvent(events[i])) {
next.add(i);
}
}
return next;
});
} else {
// Single toggle — exit selection mode if deselecting the last item
setSelectedIndices((prev) => {
const next = new Set(prev);
if (next.has(index)) {
next.delete(index);
} else {
next.add(index);
}
if (next.size === 0) {
setIsSelecting(false);
anchorRef.current = undefined;
} else {
anchorRef.current = index;
}
return next;
});
}
},
[events],
);
const selectAll = useCallback(() => {
const all = new Set<number>();
for (let i = 0; i < events.length; i++) {
if (isContentBearingEvent(events[i])) {
all.add(i);
}
}
setSelectedIndices(all);
}, [events]);
const deselectAll = useCallback(() => {
setSelectedIndices(new Set());
}, []);
const copySelected = useCallback(async (): Promise<boolean> => {
const sorted = [...selectedIndices].sort((a, b) => a - b);
const selectedEvents = sorted.filter((i) => i < events.length).map((i) => events[i]);
if (selectedEvents.length === 0) {
return false;
}
const text = formatForClipboard(selectedEvents);
try {
await navigator.clipboard.writeText(text);
return true;
} catch {
return false;
}
}, [selectedIndices, events, formatForClipboard]);
return {
isSelecting,
selectedIndices,
selectedCount,
enterSelectionMode,
cancelSelection,
toggleEvent,
selectAll,
deselectAll,
copySelected,
};
}
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