# Copyright 2021 Huawei Technologies Co., Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Copyright (c) Facebook, Inc. and its affiliates.
# All rights reserved.
#
# This source code is licensed under the license found in the
# LICENSE file in the root directory of this source tree.
#
import os
import setproctitle
from pathlib import Path
from imnet_evaluate import TrainerConfig, ClusterConfig, Trainer
from argparse import ArgumentParser, ArgumentDefaultsHelpFormatter
from datetime import datetime

def run(input_size,architecture,weight_path,imnet_path,batch,workers,shared_folder_path,job_id,local_rank,global_rank,num_tasks):
    cluster_cfg = ClusterConfig(dist_backend="hccl", dist_url="")
    shared_folder=None
    data_folder_Path=None
    if Path(str(shared_folder_path)).is_dir():
        shared_folder=Path(shared_folder_path+"/evaluate/")
    else:
        raise RuntimeError("No shared folder available")
    if Path(str(imnet_path)).is_dir():
        data_folder_Path=Path(str(imnet_path))
    else:
        raise RuntimeError("No shared folder available")
    train_cfg = TrainerConfig(
                    data_folder=str(data_folder_Path),
                    architecture=architecture,
                    weight_path=weight_path,
                    input_size=input_size,
                    imnet_path=imnet_path,
                    batch_per_gpu=batch,
                    workers=workers,
                    local_rank=local_rank,
                    global_rank=global_rank,
                    num_tasks=num_tasks,
                    job_id=job_id,
                    save_folder=str(shared_folder),
                    
                )
        
    # Create the executor
    os.makedirs(str(shared_folder), exist_ok=True)
    # init_file = shared_folder / f"{uuid.uuid4().hex}_init"
    init_file = shared_folder / datetime.now().strftime("%Y%m%d-%H%M%S")
    if init_file.exists():
        os.remove(str(init_file))
        
    trainer = Trainer(train_cfg, cluster_cfg)
    
    #The code should be launch on each GPUs
    try:    
        if global_rank==0:
            val_accuracy = trainer.__call__()
            print(f"Validation accuracy: {val_accuracy}")
        else:
            trainer.__call__()
    except Exception as e:
      print("Job failed")
      print(e)


if __name__ == "__main__":
    parser = ArgumentParser(description="Evaluation script for FixRes models",formatter_class=ArgumentDefaultsHelpFormatter)
    parser.add_argument('--input_size', default=320, type=int, help='Images input size')
    parser.add_argument('--architecture', default='IGAM_Resnext101_32x48d', type=str,choices=['ResNet50', 'PNASNet' , 'IGAM_Resnext101_32x48d'], help='Neural network architecture')
    parser.add_argument('--weight_path', default='/where/are/the/weigths.pth', type=str, help='Neural network weights')
    parser.add_argument('--imnet_path', default='/opt/npu/imagenet', type=str, help='ImageNet dataset path')
    parser.add_argument('--shared_folder_path', default='./train_cache/', type=str, help='Shared Folder')
    parser.add_argument('--batch', default=256, type=int, help='Batch per NPU')
    parser.add_argument('--workers', default=40, type=int, help='Numbers of CPUs')
    parser.add_argument('--job_id', default='0', type=str, help='id of the execution')
    parser.add_argument('--local_rank', default=0, type=int, help='GPU: Local rank')
    parser.add_argument('--global_rank', default=0, type=int, help='GPU: glocal rank')
    parser.add_argument('--num_tasks', default=1, type=int, help='How many NPUs are used')
    parser.add_argument("--addr", default="127.0.0.1", type=str)
    
    args = parser.parse_args()
    setproctitle.setproctitle('FIXRES - Eval')
    os.environ['MASTER_ADDR'] = args.addr
    os.environ['MASTER_PORT'] = '29688'
    run(args.input_size,args.architecture,args.weight_path,args.imnet_path,args.batch,args.workers,args.shared_folder_path,args.job_id,args.local_rank,args.global_rank,args.num_tasks)