#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import argparse
import os
import time
from pathlib import Path
from subprocess import Popen
from typing import List, Optional, Union

from redis import Redis
from redis.exceptions import ConnectionError

from lookyloo.default import get_homedir, get_socket_path


def check_running(name: str) -> bool:
    socket_path = get_socket_path(name)
    if not os.path.exists(socket_path):
        return False
    try:
        r = Redis(unix_socket_path=socket_path)
        return True if r.ping() else False
    except ConnectionError:
        return False


def launch_cache(storage_directory: Optional[Path]=None):
    if not storage_directory:
        storage_directory = get_homedir()
    if not check_running('cache'):
        Popen(["./run_redis.sh"], cwd=(storage_directory / 'cache'))


def shutdown_cache(storage_directory: Optional[Path]=None):
    if not storage_directory:
        storage_directory = get_homedir()
    Popen(["./shutdown_redis.sh"], cwd=(storage_directory / 'cache'))


def launch_indexing(storage_directory: Optional[Path]=None):
    if not storage_directory:
        storage_directory = get_homedir()
    if not check_running('indexing'):
        Popen(["./run_redis.sh"], cwd=(storage_directory / 'indexing'))


def shutdown_indexing(storage_directory: Optional[Path]=None):
    if not storage_directory:
        storage_directory = get_homedir()
    Popen(["./shutdown_redis.sh"], cwd=(storage_directory / 'indexing'))


def launch_all():
    launch_cache()
    launch_indexing()


def check_all(stop: bool=False):
    backends: List[List[Union[str, bool]]] = [['cache', False], ['indexing', False]]
    while True:
        for b in backends:
            try:
                b[1] = check_running(b[0])  # type: ignore
            except Exception:
                b[1] = False
        if stop:
            if not any(b[1] for b in backends):
                break
        else:
            if all(b[1] for b in backends):
                break
        for b in backends:
            if not stop and not b[1]:
                print(f"Waiting on {b[0]}")
            if stop and b[1]:
                print(f"Waiting on {b[0]}")
        time.sleep(1)


def stop_all():
    shutdown_cache()
    shutdown_indexing()


def main():
    parser = argparse.ArgumentParser(description='Manage backend DBs.')
    parser.add_argument("--start", action='store_true', default=False, help="Start all")
    parser.add_argument("--stop", action='store_true', default=False, help="Stop all")
    parser.add_argument("--status", action='store_true', default=True, help="Show status")
    args = parser.parse_args()

    if args.start:
        launch_all()
    if args.stop:
        stop_all()
    if not args.stop and args.status:
        check_all()


if __name__ == '__main__':
    main()