#!/usr/bin/env python
# Script to ramdiskify things

import argparse
import shutil
import subprocess
import sys
from pathlib import Path

def eprint(*args, **kwargs):
    print(*args, file=sys.stderr, **kwargs)

def init(target, persist):
    ramdisk = Path("/dev/shm/ramdisk")
    ramdisk.mkdir(parents=True, exist_ok=True)
    target = Path(target)
    persist = Path(persist)
    persist.mkdir(parents=True, exist_ok=True)


def sync(target, persist):
    pass

def loop_sync(target, persist):
    pass

def cleanup(target, persist):
    pass


def main():
    parser = argparse.ArgumentParser()
    # Arguments to specify the action to take
    action = parser.add_mutually_exclusive_group(required=True)
    action.add_argument("-i", "--init", action="store_true", help="Initialize the target file/directory into ramdisk")
    action.add_argument("-s", "--sync", action="store_true", help="Perform a single sync of the target from ramdisk to persistent storage")
    action.add_argument("-l", "--loop-sync", type=int, help="Starts a repeating sync that loops every LOOP_SYNC seconds")
    action.add_argument("-c", "--cleanup", action="store_true", help="clean up an existing ramdiskified target")
    # Arguments to specify what to act on
    parser.add_argument("target", help="The target file/directory to ramdiskify")
    parser.add_argument("persist", nargs="?", default=".persist", help="The location to store the persistent copy while ramdiskified, defaults to '.persist'")

    args = parser.parse_args()

    if not Path(args.target).exists():
        eprint(f"Target: {args.target} doesn't exist!")
        return


if __name__ == "__main__":
    main()