import os, random, copy
import numpy as np
import torch
import argparse
import yaml
import logging

import utils
import data
import engine

from vocab import deserialize_vocab
import mytools

def parser_options():
    # Hyper Parameters setting
    parser = argparse.ArgumentParser()
    parser.add_argument('--path_opt', default='option/RSITMD_mca/RSITMD_GAC.yaml', type=str,
                        help='path to a yaml options file')
    opt = parser.parse_args()

    # load model options
    with open(opt.path_opt, 'r') as handle:
        options = yaml.safe_load(handle)

    return options

def main(options):

    # choose model
    if options['model']['name'] == "GAC":
        from model import GAC as models
    else:
        raise NotImplementedError

    # make vocab
    vocab = deserialize_vocab(options['dataset']['vocab_path'])
    vocab_size = len(vocab)
    vocab_word = sorted(vocab.word2idx.items(), key=lambda x: x[1], reverse=False)
    vocab_word = [tup[0] for tup in vocab_word]

    # Create dataset, model, criterion and optimizer
    test_loader = data.get_test_loader(vocab, options)

    model = models.factory(options['model'],
                            vocab,
                            cuda=True,
                            data_parallel=False)

    print('Model has {} parameters'.format(utils.params_count(model)))

    # optionally resume from a checkpoint
    if os.path.isfile(options['optim']['resume']):
        print("=> loading checkpoint '{}'".format(options['optim']['resume']))
        checkpoint = torch.load(options['optim']['resume'])
        start_epoch = checkpoint['epoch']
        best_rsum = checkpoint['best_rsum']
        model.load_state_dict(checkpoint['model'], False)
    else:
        print("=> no checkpoint found at '{}'".format(options['optim']['resume']))

    # evaluate on test set
    sims = engine.validate_test(test_loader, model)

    # get indicators
    (r1i, r5i, r10i, medri, meanri), _ = utils.acc_i2t2(sims)
    logging.info("Image to text: %.1f, %.1f, %.1f, %.1f, %.1f" %
                 (r1i, r5i, r10i, medri, meanri))
    (r1t, r5t, r10t, medrt, meanrt), _ = utils.acc_t2i2(sims)
    logging.info("Text to image: %.1f, %.1f, %.1f, %.1f, %.1f" %
                 (r1t, r5t, r10t, medrt, meanrt))
    currscore = (r1t + r5t + r10t + r1i + r5i + r10i)/6.0

    all_score = "r1i:{} r5i:{} r10i:{} medri:{} meanri:{}\n r1t:{} r5t:{} r10t:{} medrt:{} meanrt:{}\n sum:{}\n ------\n".format(
        r1i, r5i, r10i, medri, meanri, r1t, r5t, r10t, medrt, meanrt, currscore
    )
    
    print(all_score)

#    return currscore
    return [r1i, r5i, r10i, r1t, r5t, r10t, currscore]


def update_options_savepath(options, k):
    updated_options = copy.deepcopy(options)

    updated_options['optim']['resume'] = options['logs']['ckpt_save_path'] + options['k_fold']['experiment_name'] + "/" \
                                         + str(k) + "/" + options['model']['name'] + '_best.pth.tar'
    # updated_options['optim']['resume'] = options['logs']['ckpt_save_path'] + options['k_fold']['experiment_name'] + "/" \
    #                                      + str(k) + "/" + 'ckpt_GAC_20_21.63.pth.tar'
    return updated_options

if __name__ == '__main__':
    options = parser_options()

    # calc ave k results
    last_score = []
    for k in range(options['k_fold']['nums']):
        print("=========================================")
        print("Start evaluate {}th fold".format(k))

        # update save path
        update_options = update_options_savepath(options, k)

        # run experiment
        one_score = main(update_options)
        print(one_score)
        last_score.append(one_score)

        print("Complete evaluate {}th fold".format(k))

    # ave
    print("===================== Ave Score ({}-fold verify) =================".format(options['k_fold']['nums']))
    print(last_score)
    last_score = np.average(last_score, axis=0)
    print(last_score)
    names = ['r1i', 'r5i', 'r10i', 'r1t', 'r5t', 'r10t', 'mr']
    for name,score in zip(names, last_score):
        print("{}:{}".format(name, score))