"""
Experiment configuration file
Extended from config file from original PANet Repository
"""
import glob
import itertools
import os
import sacred
from sacred import Experiment
from sacred.observers import FileStorageObserver
from sacred.utils import apply_backspaces_and_linefeeds
from utils import *

sacred.SETTINGS['CONFIG']['READ_ONLY_CONFIG'] = False
sacred.SETTINGS.CAPTURE_MODE = 'no'

ex = Experiment("CATNet")
ex.captured_out_filter = apply_backspaces_and_linefeeds

###### Set up source folder ######
source_folders = ['.', './dataloaders', './models', './utils']
sources_to_save = list(itertools.chain.from_iterable(
    [glob.glob(f'{folder}/*.py') for folder in source_folders]))
for source_file in sources_to_save:
    ex.add_source_file(source_file)


@ex.config
def cfg():
    """Default configurations"""
    seed = 2021
    gpu_id = 0
    num_workers = 0  # 0 for debugging.
    mode = 'train'

    ## dataset
    dataset = 'CHAOST2'  # i.e. abdominal MRI - 'CHAOST2'; cardiac MRI - CMR
    exclude_label = None  # None, for not excluding test labels;
    # 1 for Liver, 2 for RK, 3 for LK, 4 for Spleen in 'CHAOST2'
    if dataset == 'CMR':
        n_sv = 1000
    else:
        n_sv = 5000
    min_size = 200
    max_slices = 3
    use_gt = False  # True - use ground truth as training label, False - use supervoxel as training label
    eval_fold = 0  # (0-4) for 5-fold cross-validation
    test_label = [1, 4]  # for evaluation
    supp_idx = 0  # choose which case as the support set for evaluation, (0-4) for 'CHAOST2', (0-7) for 'CMR'
    n_part = 3  # for evaluation, i.e. 3 chunks

    ## training
    n_steps = 1000
    batch_size = 1
    n_shot = 1
    n_way = 1
    n_query = 1
    lr_step_gamma = 0.95
    bg_wt = 0.1
    t_loss_scaler = 0.0
    ignore_label = 255
    print_interval = 100
    save_snapshot_every = 1000
    max_iters_per_load = 1000  # epoch size, interval for reloading the dataset
    alpha=0.9 # dual-scale
    
    # Network
    # reload_model_path =
    reload_model_path = None
    
    # Prototype Refinement
    n_iters=7

    optim_type = 'sgd'
    optim = {
        'lr': 1e-3,
        'momentum': 0.9,
        'weight_decay': 0.0005,
    }

    exp_str = '_'.join(
        [mode]
        + [dataset, ]
        + [f'cv{eval_fold}'])

    path = {
        'log_dir': './runs',
        'CHAOST2': {'data_dir': './data/CHAOST2'},
        'SABS': {'data_dir': './data/SABS'},
        'CMR': {'data_dir': './data/CMR'},
    }


@ex.config_hook
def add_observer(config, command_name, logger):
    """A hook fucntion to add observer"""
    exp_name = f'{ex.path}_{config["exp_str"]}'
    observer = FileStorageObserver.create(os.path.join(config['path']['log_dir'], exp_name))
    ex.observers.append(observer)
    return config