import { FS } from '../BaseAsmModule';
import { log } from '../util/logger';
import { isMounted } from './isMounted';

/**
 * Creates a function to unmount file or directory in wasm internal memory filesystem
 * If given mounted path prefix is pointing internal buffer file mounted via `mountBuffer`,
 * it'll be removed. Otherwise it'll be unmounted and remove internal directory.
 *
 * @param {FS} FS wasm module filesystem
 * @param {string} memPathId root path in memory filesystem to determine given unmount path is physical directory or buffer.
 * This prefix path is generated automatically each time wasm module is loaded.
 *
 * @return {(mountedPath: string) => void} function to unmount given path under memory filesystem.
 */
const unmount = (FS: FS, memPathId: string): ((mountedPath: string) => void) => (mountedPath: string) => {
  if (isMounted(FS, mountedPath, 'file') && mountedPath.indexOf(memPathId) > -1) {
    log(`unmount: ${mountedPath} is typedArrayFile, unlink from memory`);
    FS.unlink(mountedPath);
    return;
  }

  if (isMounted(FS, mountedPath, 'dir')) {
    log(`unmount: ${mountedPath} is directory, unmount`);
    FS.unmount(mountedPath);
    FS.rmdir(mountedPath);
    return;
  }
};

export { unmount };