# Copyright (c) OpenMMLab. All rights reserved.
import argparse
import copy
import os
os.environ["CUDA_DEVICE_ORDER"] = 'PCI_BUS_ID'
os.environ['CUDA_VISIBLE_DEVICES'] = "0"
import os.path as osp
import time

import mmcv
import torch
from mmcv import Config, DictAction
from mmcv.runner import init_dist
from mmdet.apis import set_random_seed

from mmtrack import __version__
from mmtrack.apis import init_random_seed
from mmtrack.datasets import build_dataset
from mmtrack.utils import collect_env, get_root_logger
import warnings

warnings.filterwarnings("ignore", category=DeprecationWarning)


def parse_args():
    parser = argparse.ArgumentParser(description='Train a model')
    parser.add_argument('--config', default="../alan_configs/cfg/cfg_mo3tr_nf.py")
    parser.add_argument('--work-dir')

    parser.add_argument('--resume-from', default="")
    parser.add_argument(
        '--no-validate',
        action='store_true',
        help='whether not to evaluate the checkpoint during training')
    group_gpus = parser.add_mutually_exclusive_group()
    group_gpus.add_argument(
        '--gpus',
        type=int,
        help='number of gpus to use '
        '(only applicable to non-distributed training)')
    group_gpus.add_argument(
        '--gpu-ids',
        type=int,
        nargs='+',
        help='ids of gpus to use '
        '(only applicable to non-distributed training)')
    parser.add_argument('--seed', type=int, default=None, help='random seed')
    parser.add_argument(
        '--deterministic',
        action='store_true',
        help='whether to set deterministic options for CUDNN backend.')
    parser.add_argument(
        '--cfg-options',
        nargs='+',
        action=DictAction,
        help='override some settings in the used config, the key-value pair '
        'in xxx=yyy format will be merged into config file.')
    parser.add_argument(
        '--launcher',
        choices=['none', 'pytorch', 'slurm', 'mpi'],
        default='none',
        help='job launcher')
    parser.add_argument('--local_rank', type=int, default=0)
    args = parser.parse_args()
    if 'LOCAL_RANK' not in os.environ:
        os.environ['LOCAL_RANK'] = str(args.local_rank)

    return args


def main():
    args = parse_args()

    cfg = Config.fromfile(args.config)

    if cfg.get('USE_MMDET', False):
        from mmdet.apis import train_detector as train_model
        from mmdet.models import build_detector as build_model
        if 'detector' in cfg.model:
            cfg.model = cfg.model.detector
    elif cfg.get('TRAIN_REID', False):
        from mmdet.apis import train_detector as train_model
        from mmtrack.models import build_reid as build_model
        if 'reid' in cfg.model:
            cfg.model = cfg.model.reid
    else:
        from mmtrack.apis import train_model
        from mmtrack.models import build_model
    if args.cfg_options is not None:
        cfg.merge_from_dict(args.cfg_options)
    # set cudnn_benchmark
    if cfg.get('cudnn_benchmark', False):
        torch.backends.cudnn.benchmark = True

    # work_dir is determined in this priority: CLI > segment in file > filename
    if args.work_dir is not None:
        # update configs according to CLI args if args.work_dir is not None
        cfg.work_dir = args.work_dir
    elif cfg.get('work_dir', None) is None:
        # use config filename as default work_dir if cfg.work_dir is None
        cfg.work_dir = osp.join('./work_dirs',
                                osp.splitext(osp.basename(args.config))[0])
    if args.resume_from is not None:
        cfg.resume_from = args.resume_from
    if args.gpu_ids is not None:
        cfg.gpu_ids = args.gpu_ids
    else:
        cfg.gpu_ids = range(1) if args.gpus is None else range(args.gpus)

    # init distributed env first, since logger depends on the dist info.
    if args.launcher == 'none':
        distributed = False
    else:
        distributed = True
        init_dist(args.launcher, **cfg.dist_params)

    # create work_dir
    mmcv.mkdir_or_exist(osp.abspath(cfg.work_dir))
    # dump config
    cfg.dump(osp.join(cfg.work_dir, osp.basename(args.config)))
    # init the logger before other steps
    timestamp = time.strftime('%Y%m%d_%H%M%S', time.localtime())
    log_file = osp.join(cfg.work_dir, f'{timestamp}.log')
    logger = get_root_logger(log_file=log_file, log_level=cfg.log_level)

    # init the meta dict to record some important information such as
    # environment info and seed, which will be logged
    meta = dict()
    # log env info
    env_info_dict = collect_env()
    env_info = '\n'.join([(f'{k}: {v}') for k, v in env_info_dict.items()])
    dash_line = '-' * 60 + '\n'
    logger.info('Environment info:\n' + dash_line + env_info + '\n' +
                dash_line)
    meta['env_info'] = env_info

    # log some basic info
    logger.info(f'Distributed training: {distributed}')
    logger.info(f'Config:\n{cfg.pretty_text}')

    # set random seeds. Force setting fixed seed and deterministic=True in SOT
    # configs
    if args.seed is not None:
        cfg.seed = args.seed
    elif cfg.get('seed', None) is None:
        cfg.seed = init_random_seed()

    deterministic = True if args.deterministic else cfg.get(
        'deterministic', False)
    logger.info(f'Set random seed to {cfg.seed}, '
                f'deterministic: {deterministic}')
    set_random_seed(cfg.seed, deterministic=deterministic)
    meta['seed'] = cfg.seed

    if cfg.get('train_cfg', False):
        model = build_model(
            cfg.model, train_cfg=cfg.train_cfg, test_cfg=cfg.test_cfg)
    else:
        model = build_model(cfg.model)
    model.init_weights()

    datasets = [build_dataset(cfg.data.train)]
    if len(cfg.workflow) == 2:
        val_dataset = copy.deepcopy(cfg.data.val)
        val_dataset.pipeline = cfg.data.train.pipeline
        datasets.append(build_dataset(val_dataset))
    if cfg.checkpoint_config is not None:
        # save mmtrack version, config file content and class names in
        # checkpoints as meta data
        cfg.checkpoint_config.meta = dict(
            mmtrack_version=__version__,
            config=cfg.pretty_text,
            CLASSES=datasets[0].CLASSES)
    # add an attribute for visualization convenience
    model.CLASSES = datasets[0].CLASSES
    train_model(
        model,
        datasets,
        cfg,
        distributed=distributed,
        validate=(not args.no_validate),
        timestamp=timestamp,
        meta=meta)


if __name__ == '__main__':
    main()
