let sessionId = null;
const getPrefix = () => {
    if (!sessionId) {
        sessionId = crypto.randomUUID();
    }
    return `__remotion_render:${sessionId}:`;
};
export const cleanupStaleOpfsFiles = async () => {
    try {
        const root = await navigator.storage.getDirectory();
        for await (const [name] of root.entries()) {
            if (name.startsWith('__remotion_render:') &&
                !name.startsWith(getPrefix())) {
                await root.removeEntry(name);
            }
        }
    }
    catch (_a) {
        // Ignore, could already be closed
    }
};
export const createWebFsTarget = async () => {
    const directoryHandle = await navigator.storage.getDirectory();
    const filename = `${getPrefix()}${crypto.randomUUID()}`;
    const fileHandle = await directoryHandle.getFileHandle(filename, {
        create: true,
    });
    const writable = await fileHandle.createWritable();
    const stream = new WritableStream({
        async write(chunk) {
            await writable.seek(chunk.position);
            await writable.write(chunk);
        },
    });
    const getBlob = async () => {
        const handle = await directoryHandle.getFileHandle(filename);
        return handle.getFile();
    };
    const close = () => writable.close();
    return { stream, getBlob, close };
};