#!/usr/bin/python3

import argparse
from itertools import cycle
import json
import sys
import tempfile
import time

from argparse import Namespace
from concurrent.futures import ProcessPoolExecutor
from helpers.cmd import random_payload
from helpers.frostfs_cli import create_container, upload_object

ERROR_WRONG_CONTAINERS_COUNT = 1
ERROR_WRONG_OBJECTS_COUNT = 2
MAX_WORKERS = 50
DEFAULT_POLICY = "REP 2 IN X CBF 2 SELECT 2 FROM * AS X"

parser = argparse.ArgumentParser()
parser.add_argument('--size', help='Upload objects size in kb')
parser.add_argument('--containers', help='Number of containers to create')
parser.add_argument('--retry', default=20, help='Maximum number of retries to create a container')
parser.add_argument('--out', help='JSON file with output')
parser.add_argument('--preload_obj', help='Number of pre-loaded objects')
parser.add_argument('--wallet', help='Wallet file path')
parser.add_argument('--config', help='Wallet config file path')
parser.add_argument(
    "--policy",
    help=f"Container placement policy. Default is {DEFAULT_POLICY}",
    action="append"
)
parser.add_argument('--endpoint', help='Nodes addresses separated by comma.')
parser.add_argument('--update', help='Save existed containers')
parser.add_argument('--ignore-errors', help='Ignore preset errors', action='store_true')
parser.add_argument('--workers', help='Count of workers in preset. Max = 50, Default = 50', default=50)
parser.add_argument('--sleep', help='Time to sleep between containers creation and objects upload (in seconds), '
                                    'Default = 8', default=8)
parser.add_argument('--local', help='Create containers that store data on provided endpoints. Warning: additional empty containers may be created.', action='store_true')

args: Namespace = parser.parse_args()
print(args)


def main():
    containers = []
    objects_list = []

    endpoints = args.endpoint.split(',')
    if not args.policy:
        args.policy = [DEFAULT_POLICY]

    container_creation_retry = args.retry
    wallet = args.wallet
    wallet_config = args.config
    workers = int(args.workers)
    objects_per_container = int(args.preload_obj)
    
    ignore_errors = args.ignore_errors
    if args.update:
        # Open file
        with open(args.out) as f:
            data_json = json.load(f)
            containers = data_json['containers']
            containers_count = len(containers)
    else:
        containers_count = int(args.containers)
        print(f"Create containers: {containers_count}")
        with ProcessPoolExecutor(max_workers=min(MAX_WORKERS, workers)) as executor:
            containers_runs = [executor.submit(create_container, endpoint, policy, container_creation_retry, wallet, wallet_config, args.local)
                               for _, endpoint, policy in 
                               zip(range(containers_count), cycle(endpoints), cycle(args.policy))]

        for run in containers_runs:
            container_id = run.result()
            if container_id:
                containers.append(container_id)

        print("Create containers: Completed")

    print(f" > Containers: {containers}")
    if containers_count > 0 and len(containers) != containers_count:
        print(f"Containers mismatch in preset: expected {containers_count}, created {len(containers)}")
        if not ignore_errors:
            sys.exit(ERROR_WRONG_CONTAINERS_COUNT)

    if args.sleep != 0:
        print(f"Sleep for {args.sleep} seconds")
        time.sleep(args.sleep)

    print(f"Upload objects to each container: {args.preload_obj} ")
    payload_file = tempfile.NamedTemporaryFile()
    random_payload(payload_file, args.size)
    print(" > Create random payload: Completed")

    total_objects = objects_per_container * containers_count
    with ProcessPoolExecutor(max_workers=min(MAX_WORKERS, workers)) as executor:
        objects_runs = [executor.submit(upload_object, container, payload_file.name, 
                                        endpoint, wallet, wallet_config)
                        for _, container, endpoint in 
                        zip(range(total_objects), cycle(containers), cycle(endpoints))]
                        
    for run in objects_runs:
        result = run.result()
        if result:
            container_id = result[0]
            endpoint = result[1]
            object_id = result[2]
            objects_list.append({'container': container_id, 'object': object_id})
            print(f" > Uploaded object {object_id} for container {container_id} via endpoint {endpoint}.")

    print("Upload objects to each container: Completed")

    if total_objects > 0 and len(objects_list) != total_objects:
        print(f"Objects mismatch in preset: expected {total_objects}, created {len(objects_list)}")
        if not ignore_errors:
            sys.exit(ERROR_WRONG_OBJECTS_COUNT)

    data = {'containers': containers, 'objects': objects_list, 'obj_size': args.size + " Kb"}

    with open(args.out, 'w+') as f:
        json.dump(data, f, ensure_ascii=False, indent=2)

    print("Result:")
    print(f" > Total Containers has been created: {len(containers)}.")
    print(f" > Total Objects has been created: {len(objects_list)}.")


if __name__ == "__main__":
    main()