from configparser import ConfigParser
import pytest
import argparse
import os
from rl_coach.coach import CoachLauncher
import sys
from minio import Minio


def generate_config(image, memory_backend, s3_end_point, s3_bucket_name, s3_creds_file, config_file):
    """
    Generate the s3 config file to be used and also the dist-coach-config.template to be used for the test
    It reads the `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY` env vars and fails if they are not provided.
    """
    # Write s3 creds
    aws_config = ConfigParser({
        'aws_access_key_id': os.environ.get('AWS_ACCESS_KEY_ID'),
        'aws_secret_access_key': os.environ.get('AWS_SECRET_ACCESS_KEY')
    }, default_section='default')
    with open(s3_creds_file, 'w') as f:
        aws_config.write(f)

    coach_config = ConfigParser({
        'image': image,
        'memory_backend': memory_backend,
        'data_store': 's3',
        's3_end_point': s3_end_point,
        's3_bucket_name': s3_bucket_name,
        's3_creds_file': s3_creds_file
    }, default_section="coach")
    with open(config_file, 'w') as f:
        coach_config.write(f)


def test_command(command):
    """
    Launches the actual training.
    """
    sys.argv = command
    launcher = CoachLauncher()
    with pytest.raises(SystemExit) as e:
        launcher.launch()
    assert e.value.code == 0


def clear_bucket(s3_end_point, s3_bucket_name):
    """
    Clear the bucket before starting the test.
    """
    access_key = os.environ.get('AWS_ACCESS_KEY_ID')
    secret_access_key = os.environ.get('AWS_SECRET_ACCESS_KEY')
    minio_client = Minio(s3_end_point, access_key=access_key, secret_key=secret_access_key)
    try:
        for obj in minio_client.list_objects_v2(s3_bucket_name, recursive=True):
            minio_client.remove_object(s3_bucket_name, obj.object_name)
    except Exception:
        pass


def test_dc(command, image, memory_backend, s3_end_point, s3_bucket_name, s3_creds_file, config_file):
    """
    Entry point into the test
    """
    clear_bucket(s3_end_point, s3_bucket_name)
    command = command.format(template=config_file).split(' ')
    test_command(command)


def get_tests():
    """
    All the presets to test. New presets should be added here.
    """
    tests = [
        'rl_coach/coach.py -p CartPole_ClippedPPO -dc -e sample -dcp {template} --dump_worker_logs -asc --is_multi_node_test --seed 1',
        'rl_coach/coach.py -p Mujoco_ClippedPPO -lvl inverted_pendulum -dc -e sample -dcp {template} --dump_worker_logs -asc --is_multi_node_test --seed 1'
    ]
    return tests


def main():
    parser = argparse.ArgumentParser()

    parser.add_argument(
        '-i', '--image', help="(string) Name of the testing image", type=str, default=None
    )
    parser.add_argument(
        '-mb', '--memory_backend', help="(string) Name of the memory backend", type=str, default="redispubsub"
    )
    parser.add_argument(
        '-e', '--endpoint', help="(string) Name of the s3 endpoint", type=str, default='s3.amazonaws.com'
    )
    parser.add_argument(
        '-cr', '--creds_file', help="(string) Path of the s3 creds file", type=str, default='.aws_creds'
    )
    parser.add_argument(
        '-b', '--bucket', help="(string) Name of the bucket for s3", type=str, default=None
    )

    args = parser.parse_args()

    if not args.bucket:
        print("bucket_name required for s3")
        exit(1)
    if not os.environ.get('AWS_ACCESS_KEY_ID') or not os.environ.get('AWS_SECRET_ACCESS_KEY'):
        print("AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY env vars need to be set")
        exit(1)

    config_file = './tmp.cred'
    generate_config(args.image, args.memory_backend, args.endpoint, args.bucket, args.creds_file, config_file)
    for command in get_tests():
        test_dc(command, args.image, args.memory_backend, args.endpoint, args.bucket, args.creds_file, config_file)


if __name__ == "__main__":
    main()