import sys
from datetime import datetime
import numpy as np
import torch
from utils.metrics import *
from collections import OrderedDict
import os



def evaluate_matching_score(eval_wrapper,motion_loaders, file):
    match_score_dict = OrderedDict({})
    R_precision_dict = OrderedDict({})
    activation_dict = OrderedDict({})
    # print(motion_loaders.keys())
    print('========== Evaluating Matching Score ==========')
    for motion_loader_name, motion_loader in motion_loaders.items():
        all_motion_embeddings = []
        score_list = []
        all_size = 0
        matching_score_sum = 0
        top_k_count = 0
        # print(motion_loader_name)
        with torch.no_grad():
            for idx, batch in enumerate(motion_loader):
                word_embeddings, pos_one_hots, _, sent_lens, motions, m_lens, _ = batch
                text_embeddings, motion_embeddings = eval_wrapper.get_co_embeddings(
                    word_embs=word_embeddings,
                    pos_ohot=pos_one_hots,
                    cap_lens=sent_lens,
                    motions=motions,
                    m_lens=m_lens
                )
                dist_mat = euclidean_distance_matrix(text_embeddings.cpu().numpy(),
                                                     motion_embeddings.cpu().numpy())
                matching_score_sum += dist_mat.trace()
                # import pdb;pdb.set_trace()

                argsmax = np.argsort(dist_mat, axis=1)
                top_k_mat = calculate_top_k(argsmax, top_k=3)
                top_k_count += top_k_mat.sum(axis=0)

                all_size += text_embeddings.shape[0]

                all_motion_embeddings.append(motion_embeddings.cpu().numpy())

            all_motion_embeddings = np.concatenate(all_motion_embeddings, axis=0)
            # import pdb;pdb.set_trace()
            matching_score = matching_score_sum / all_size
            R_precision = top_k_count / all_size
            match_score_dict[motion_loader_name] = matching_score
            R_precision_dict[motion_loader_name] = R_precision
            activation_dict[motion_loader_name] = all_motion_embeddings

        print(f'---> [{motion_loader_name}] Matching Score: {matching_score:.4f}')
        print(f'---> [{motion_loader_name}] Matching Score: {matching_score:.4f}', file=file, flush=True)

        line = f'---> [{motion_loader_name}] R_precision: '
        for i in range(len(R_precision)):
            line += '(top %d): %.4f ' % (i+1, R_precision[i])
        print(line)
        print(line, file=file, flush=True)

    return match_score_dict, R_precision_dict, activation_dict


def evaluate_fid(eval_wrapper,groundtruth_loader, activation_dict, file):
    eval_dict = OrderedDict({})
    gt_motion_embeddings = []
    print('========== Evaluating FID ==========')
    with torch.no_grad():
        for idx, batch in enumerate(groundtruth_loader):
            _, _, _, sent_lens, motions, m_lens, _ = batch
            motion_embeddings = eval_wrapper.get_motion_embeddings(
                motions=motions,
                m_lens=m_lens
            )
            gt_motion_embeddings.append(motion_embeddings.cpu().numpy())
    gt_motion_embeddings = np.concatenate(gt_motion_embeddings, axis=0)
    gt_mu, gt_cov = calculate_activation_statistics(gt_motion_embeddings)

    for model_name, motion_embeddings in activation_dict.items():
        mu, cov = calculate_activation_statistics(motion_embeddings)
        # print(mu)
        fid = calculate_frechet_distance(gt_mu, gt_cov, mu, cov)
        print(f'---> [{model_name}] FID: {fid:.4f}')
        print(f'---> [{model_name}] FID: {fid:.4f}', file=file, flush=True)
        eval_dict[model_name] = fid
    return eval_dict


def evaluate_diversity(activation_dict, file, diversity_times):
    eval_dict = OrderedDict({})
    print('========== Evaluating Diversity ==========')
    for model_name, motion_embeddings in activation_dict.items():
        diversity = calculate_diversity(motion_embeddings, diversity_times)
        eval_dict[model_name] = diversity
        print(f'---> [{model_name}] Diversity: {diversity:.4f}')
        print(f'---> [{model_name}] Diversity: {diversity:.4f}', file=file, flush=True)
    return eval_dict


def evaluate_multimodality(eval_wrapper, mm_motion_loaders, file, mm_num_times):
    eval_dict = OrderedDict({})
    print('========== Evaluating MultiModality ==========')
    for model_name, mm_motion_loader in mm_motion_loaders.items():
        mm_motion_embeddings = []
        with torch.no_grad():
            for idx, batch in enumerate(mm_motion_loader):
                # (1, mm_replications, dim_pos)
                motions, m_lens = batch
                motion_embedings = eval_wrapper.get_motion_embeddings(motions[0], m_lens[0])
                mm_motion_embeddings.append(motion_embedings.unsqueeze(0))
        if len(mm_motion_embeddings) == 0:
            multimodality = 0
        else:
            mm_motion_embeddings = torch.cat(mm_motion_embeddings, dim=0).cpu().numpy()
            multimodality = calculate_multimodality(mm_motion_embeddings, mm_num_times)
        print(f'---> [{model_name}] Multimodality: {multimodality:.4f}')
        print(f'---> [{model_name}] Multimodality: {multimodality:.4f}', file=file, flush=True)
        eval_dict[model_name] = multimodality
    return eval_dict


def get_metric_statistics(values, replication_times):
    mean = np.mean(values, axis=0)
    std = np.std(values, axis=0)
    conf_interval = 1.96 * std / np.sqrt(replication_times)
    return mean, conf_interval


def evaluation(eval_wrapper, gt_loader, eval_motion_loaders, log_file, replication_times, diversity_times, mm_num_times, run_mm=False):
    with open(log_file, 'a') as f:
        all_metrics = OrderedDict({'Matching Score': OrderedDict({}),
                                   'R_precision': OrderedDict({}),
                                   'FID': OrderedDict({}),
                                   'Diversity': OrderedDict({}),
                                   'MultiModality': OrderedDict({})})

        for replication in range(replication_times):
            print(f'Time: {datetime.now()}')
            print(f'Time: {datetime.now()}', file=f, flush=True)
            motion_loaders = {}
            motion_loaders['ground truth'] = gt_loader
            mm_motion_loaders = {}
            # motion_loaders['ground truth'] = gt_loader
            for motion_loader_name, motion_loader_getter in eval_motion_loaders.items():
                motion_loader, mm_motion_loader,eval_generate_time = motion_loader_getter()
                print(f'---> [{motion_loader_name}] batch_generate_time: {eval_generate_time}s', file=f, flush=True)
                motion_loaders[motion_loader_name] = motion_loader
                mm_motion_loaders[motion_loader_name] = mm_motion_loader

            if replication_times>1:
                print(f'==================== Replication {replication} ====================')
                print(f'==================== Replication {replication} ====================', file=f, flush=True)


            mat_score_dict, R_precision_dict, acti_dict = evaluate_matching_score(eval_wrapper, motion_loaders, f)

            fid_score_dict = evaluate_fid(eval_wrapper, gt_loader, acti_dict, f)

            div_score_dict = evaluate_diversity(acti_dict, f, diversity_times)

            if run_mm:
                mm_score_dict = evaluate_multimodality(eval_wrapper, mm_motion_loaders, f, mm_num_times)

            print(f'!!! DONE !!!')
            print(f'!!! DONE !!!', file=f, flush=True)

            for key, item in mat_score_dict.items():
                if key not in all_metrics['Matching Score']:
                    all_metrics['Matching Score'][key] = [item]
                else:
                    all_metrics['Matching Score'][key] += [item]

            for key, item in R_precision_dict.items():
                if key not in all_metrics['R_precision']:
                    all_metrics['R_precision'][key] = [item]
                else:
                    all_metrics['R_precision'][key] += [item]

            for key, item in fid_score_dict.items():
                if key not in all_metrics['FID']:
                    all_metrics['FID'][key] = [item]
                else:
                    all_metrics['FID'][key] += [item]

            for key, item in div_score_dict.items():
                if key not in all_metrics['Diversity']:
                    all_metrics['Diversity'][key] = [item]
                else:
                    all_metrics['Diversity'][key] += [item]

            for key, item in mm_score_dict.items():
                if key not in all_metrics['MultiModality']:
                    all_metrics['MultiModality'][key] = [item]
                else:
                    all_metrics['MultiModality'][key] += [item]


        mean_dict = {}
        if replication_times>1:
            for metric_name, metric_dict in all_metrics.items():
                print('========== %s Summary ==========' % metric_name)
                print('========== %s Summary ==========' % metric_name, file=f, flush=True)

                for model_name, values in metric_dict.items():
                    # print(metric_name, model_name)
                    mean, conf_interval = get_metric_statistics(np.array(values),replication_times)
                    mean_dict[metric_name + '_' + model_name] = mean
                    # print(mean, mean.dtype)
                    if isinstance(mean, np.float64) or isinstance(mean, np.float32):
                        print(f'---> [{model_name}] Mean: {mean:.4f} CInterval: {conf_interval:.4f}')
                        print(f'---> [{model_name}] Mean: {mean:.4f} CInterval: {conf_interval:.4f}', file=f, flush=True)
                    elif isinstance(mean, np.ndarray):
                        line = f'---> [{model_name}]'
                        for i in range(len(mean)):
                            line += '(top %d) Mean: %.4f CInt: %.4f;' % (i+1, mean[i], conf_interval[i])
                        print(line)
                        print(line, file=f, flush=True)
            return mean_dict
        else:
            return all_metrics


def distributed_evaluation(eval_wrapper, gt_loader, eval_motion_loader, log_file, replication_times, diversity_times):
    with open(log_file, 'a') as f:
        all_metrics = OrderedDict({'Matching Score': OrderedDict({}),
                                   'R_precision': OrderedDict({}),
                                   'FID': OrderedDict({}),
                                   'Diversity': OrderedDict({}),
                                   'MultiModality': OrderedDict({})})

        for replication in range(replication_times):
            print(f'Time: {datetime.now()}')
            print(f'Time: {datetime.now()}', file=f, flush=True)
            motion_loaders = {'test':eval_motion_loader}

            if replication_times>1:
                print(f'==================== Replication {replication} ====================')
                print(f'==================== Replication {replication} ====================', file=f, flush=True)


            mat_score_dict, R_precision_dict, acti_dict = evaluate_matching_score(eval_wrapper, motion_loaders, f)

            fid_score_dict = evaluate_fid(eval_wrapper, gt_loader, acti_dict, f)

            div_score_dict = evaluate_diversity(acti_dict, f, diversity_times)


            print(f'!!! DONE !!!')
            print(f'!!! DONE !!!', file=f, flush=True)

            for key, item in mat_score_dict.items():
                if key not in all_metrics['Matching Score']:
                    all_metrics['Matching Score'][key] = [item]
                else:
                    all_metrics['Matching Score'][key] += [item]

            for key, item in R_precision_dict.items():
                if key not in all_metrics['R_precision']:
                    all_metrics['R_precision'][key] = [item]
                else:
                    all_metrics['R_precision'][key] += [item]

            for key, item in fid_score_dict.items():
                if key not in all_metrics['FID']:
                    all_metrics['FID'][key] = [item]
                else:
                    all_metrics['FID'][key] += [item]

            for key, item in div_score_dict.items():
                if key not in all_metrics['Diversity']:
                    all_metrics['Diversity'][key] = [item]
                else:
                    all_metrics['Diversity'][key] += [item]

        mean_dict = {}
        for metric_name, metric_dict in all_metrics.items():
            print('========== %s Summary ==========' % metric_name)
            print('========== %s Summary ==========' % metric_name, file=f, flush=True)

            for model_name, values in metric_dict.items():
                # print(metric_name, model_name)
                mean, conf_interval = get_metric_statistics(np.array(values),replication_times)
                mean_dict[metric_name + '_' + model_name] = mean
                # print(mean, mean.dtype)
                if isinstance(mean, np.float64) or isinstance(mean, np.float32):
                    print(f'---> [{model_name}] Mean: {mean:.4f} CInterval: {conf_interval:.4f}')
                    print(f'---> [{model_name}] Mean: {mean:.4f} CInterval: {conf_interval:.4f}', file=f, flush=True)
                elif isinstance(mean, np.ndarray):
                    line = f'---> [{model_name}]'
                    for i in range(len(mean)):
                        line += '(top %d) Mean: %.4f CInt: %.4f;' % (i+1, mean[i], conf_interval[i])
                    print(line)
                    print(line, file=f, flush=True)
        return mean_dict