import os
import random
import time
from multiprocessing import Process
import argparse
from computation import Computation
from sqlalchemy.orm import close_all_sessions

import yaml


def do_computation(c_db):
    exp = Computation(c_db)

    while 1:
        time.sleep(random.uniform(0, 10))
        is_all_done = exp.run()
        if is_all_done:
            break


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='setting')
    parser.add_argument('--exp', type=str, default='test')
    parser.add_argument('--job', type=int, default='3')
    parser.add_argument('--reset_sample', type=int, default='0')
    parser.add_argument('--reset_db', type=bool, default=False)

    args = parser.parse_args()
    assert args.job >= 1, 'Number of jobs should >= 1'

    prefix_file_name = 'conf_db_prefix.yaml'
    if os.path.exists(prefix_file_name):
        os.remove(prefix_file_name)
    with open(prefix_file_name, 'w', encoding='utf-8') as file:
        yaml.dump({'db_name_prefix': args.exp}, file)

    from controller_db import ControllerDB
    controller_db = ControllerDB(args.exp, reset_flag=args.reset_sample)
    # controller_db.reset_db()

    # force drop
    controller_db.reset_db(force_drop=args.reset_db)

    controller_db.prepare_list_sample()

    close_all_sessions()

    process_list = []
    for i in range(int(args.job)):
        p = Process(target=do_computation, args=(controller_db,))
        p.start()
        process_list.append(p)

    for i in process_list:
        i.join()