/** Routes that can receive a handoff from another route. */
export type PendingFileTarget = 'bea' | 'pagination';

type QueuedFile = { file: File; target: PendingFileTarget };

let queue: QueuedFile[] = [];

/**
 * In-memory handoff between routes (start page → beA workspace, merge →
 * pagination). Nothing is uploaded or persisted; the receiving route takes and
 * clears the files queued for its own target on mount.
 *
 * The target keeps a queued ZIP from being consumed — and silently dropped — by
 * a tool that only accepts PDFs.
 */
export const queuePendingFiles = (files: File[], target: PendingFileTarget) => {
	queue = [...queue, ...files.map((file) => ({ file, target }))];
};

/** Takes (and clears) the files queued for `target`; other targets stay queued. */
export const takePendingFiles = (target: PendingFileTarget): File[] => {
	const taken: File[] = [];
	const remaining: QueuedFile[] = [];

	for (const entry of queue) {
		if (entry.target === target) taken.push(entry.file);
		else remaining.push(entry);
	}

	queue = remaining;
	return taken;
};

/** Test/storybook helper: forget everything that is still queued. */
export const clearPendingFiles = () => {
	queue = [];
};