#!/usr/bin/env python
# pylint: disable=W0201
import sys
import argparse
import yaml
import numpy as np
from tqdm import tqdm
# torch
import torch
import torch.nn as nn
import torch.optim as optim
import time
import torch.nn.functional as F
# torchlight
import torchlight.torchlight as torchlight
from torchlight.torchlight import str2bool
from torchlight.torchlight import DictAction
from torchlight.torchlight import import_class
from .evaluate_metrics import *
from .processor import Processor


def weights_init(m):
    classname = m.__class__.__name__
    if classname.find('Conv1d') != -1:
        m.weight.data.normal_(0.0, 0.02)
        if m.bias is not None:
            m.bias.data.fill_(0)
    elif classname.find('Conv2d') != -1:
        m.weight.data.normal_(0.0, 0.02)
        if m.bias is not None:
            m.bias.data.fill_(0)
    elif classname.find('BatchNorm') != -1:
        m.weight.data.normal_(1.0, 0.02)
        m.bias.data.fill_(0)
def sliding_window_crop(input_data,label,window_size=64):
    '''
    window_size=32 ~ 1second for pkummd dataset
    '''
    N,T,V,C,M = input_data.shape
    assert N==1 #only process each video at a time 
    #target dim: N*T, window_size, V,C,M 
    new_data = []
    new_label = []
    for i in range(N):
        label_mask = (label!=255)
        length = label_mask.float().sum()
        for t in range(int(length)):
            sample_s = t
            if sample_s<window_size//2:
                sample_s = 0
                sample_e = window_size
            elif sample_s>length-(window_size//2):
                sample_s = length-window_size
                sample_e = length
            else:
                sample_s = sample_s - (window_size//2)
                sample_e = sample_s +  window_size
            sample_s = int(sample_s)
            sample_e = int(sample_e)
            new_data.append(input_data[i][sample_s:sample_e]) # window_size, V,C,M
            new_label.append(label[i][t])
    new_data = torch.stack(new_data,dim=0)#N*length, window_size, V,C,M
    new_label = torch.stack(new_label,dim=0)#N*length

    for i in range(5):
        assert new_data.shape[i] == (N*length, window_size, V,C,M)[i]

    return new_data, new_label

def sliding_window_crop_downsample(input_data,label,window_size=32, downsample=1):
    '''
    window_size=32 ~ 1second for pkummd dataset
    '''
    N,T,V,C,M = input_data.shape
    window_size = window_size * downsample 
    assert N==1 #only process each video at a time 
    #target dim: N*T, window_size, V,C,M 
    new_data = []
    new_label = []
    for i in range(N):
        label_mask = (label!=255)
        length = label_mask.float().sum()
        for t in range(int(length)):
            sample_s = t
            if sample_s<window_size//2:
                sample_s = 0
                sample_e = window_size
            elif sample_s>length-(window_size//2):
                sample_s = length-window_size
                sample_e = length
            else:
                sample_s = sample_s - (window_size//2)
                sample_e = sample_s +  window_size
            sample_s = int(sample_s)
            sample_e = int(sample_e)
            new_data.append(input_data[i][sample_s:sample_e:downsample]) # window_size, V,C,M
            new_label.append(label[i][t])
    new_data = torch.stack(new_data,dim=0)#N*length, window_size, V,C,M
    new_label = torch.stack(new_label,dim=0)#N*length

    for i in range(5):
        assert new_data.shape[i] == (N*length, window_size//downsample, V,C,M)[i]

    return new_data, new_label

class DT_Processor(Processor):
    """
        Processor for Skeleton-based Action Recgnition
    """

    def load_model(self):
        self.model = self.io.load_model(self.arg.model,
                                        **(self.arg.model_args))
        self.model.apply(weights_init)

        # for name, param in self.model.encoder_q.named_parameters():
        #     if name in 'msff':
        #         print('yes')
        #     if name not in ['fc.weight', 'fc.bias', 'encoder_q.fc.weight', 'encoder_q.fc.bias','msff']:
        #         param.requires_grad = False
        # self.num_grad_layers = 2

        self.loss = nn.CrossEntropyLoss(ignore_index=255)
        
    def load_optimizer(self):
        parameters = list(filter(lambda p: p.requires_grad, self.model.parameters()))
        #print()
        # assert len(parameters) == self.num_grad_layers
        if self.arg.optimizer == 'SGD':
            self.optimizer = optim.SGD(
                parameters,
                lr=self.arg.base_lr,
                momentum=0.9,
                nesterov=self.arg.nesterov,
                weight_decay=self.arg.weight_decay)
        elif self.arg.optimizer == 'Adam':
            self.optimizer = optim.Adam(
                parameters,
                lr=self.arg.base_lr,
                weight_decay=self.arg.weight_decay)
        else:
            raise ValueError()
    
    def show_best(self, k):
        rank = self.result.argsort()
        hit_top_k = [l in rank[i, -k:] for i, l in enumerate(self.label)]
        accuracy = 100 * sum(hit_top_k) * 1.0 / len(hit_top_k)
        accuracy = round(accuracy, 5)
        self.current_result = accuracy
        if self.best_result <= accuracy:
            self.best_result = accuracy
        self.io.print_log('\tBest Top{}: {:.2f}%'.format(k, self.best_result))

    def adjust_lr(self):
        # if self.arg.optimizer == 'SGD' and self.arg.step:
        if self.arg.step:
            if self.meta_info['epoch'] < self.arg.warm_up_epoch:
                lr = self.arg.base_lr * (self.meta_info['epoch']) / self.arg.warm_up_epoch
            else:
                lr = self.arg.base_lr * (
                    0.1**np.sum(self.meta_info['epoch']>= np.array(self.arg.step)))
            for param_group in self.optimizer.param_groups:
                param_group['lr'] = lr
            self.lr = lr
        else:
            self.lr = self.arg.base_lr

    def show_topk(self, k):
        rank = self.result.argsort()
        hit_top_k = [l in rank[i, -k:] for i, l in enumerate(self.label)]
        accuracy = sum(hit_top_k) * 1.0 / len(hit_top_k)
        if k==1:
            self.test_acc = int(accuracy*100000)
        self.io.print_log('\tTop{}: {:.2f}%'.format(k, 100 * accuracy))
    
    def train(self,epoch):
        #return 
        self.model.train()
        #return
        self.adjust_lr()
        loader = self.data_loader['train']
        loss_value = []
        process = tqdm(loader)
        for data, label, start_pos, video_name in process:
            
            # get data
            #print(label.max(),label.min())
            data = data.float().to(self.dev)
            label = label.long().to(self.dev)#N,T
            
            # forward
            output = self.model(data)
            # print(output.shape)
            # print(label.shape)
            # output = output.amax(dim=1)
            # output = output[:,-1,:]
            # output = output.permute(0, 2, 1)
            
            loss = self.loss(output, label)
            
            # backward
            self.optimizer.zero_grad()
            loss.backward()
            self.optimizer.step()

            # statistics
            self.iter_info['loss'] = loss.data.item()
            self.iter_info['lr'] = '{:.6f}'.format(self.lr)
            loss_value.append(self.iter_info['loss'])
            self.show_iter_info()
            self.meta_info['iter'] += 1

        self.epoch_info['mean_loss']= np.mean(loss_value)
        self.show_epoch_info()
        self.io.print_timer()

    def merge_list(self, vid_list):
        group_list = []
        idx_per = []
        vid_list_uqk = []
        for idx, name in enumerate(vid_list):
            if idx == len(vid_list)-1:
                last_name = ''
            else:
                last_name = vid_list[idx+1]
            if name != last_name:
                idx_per.append(idx)
                group_list.append(np.asarray(idx_per).astype(int) )
                vid_list_uqk.append(name)
                idx_per = []
            else:
                idx_per.append(idx)
        return group_list, vid_list_uqk

    def test(self, epoch):
        #self.current_result = 0.0
        #self.best_result = 0.0
        #return
        self.model.eval()
        loader = self.data_loader['test']
        loss_value = []
        result_frag = []
        label_frag = []
        start_frag = []
        video_name_frag = []
        process = tqdm(loader)
        sfm = nn.Softmax(dim=-1)
        for data, label,start_pos,video_name in process:
            # with open ('1.txt','w') as f:
            #     l = label[0].shape[0]
            #     for i in range(l):
            #         f.write(str(int(label[0][i].cpu().numpy()))+'\n')
            #time.sleep(1000)
            # get data
            N,T,V,C,M = data.shape
            data = data.float().to(self.dev)
            label = label.long().to(self.dev)
            assert data.shape[0] == 1 # only process per video once time
            data, label = sliding_window_crop_downsample(data,label,window_size=64,downsample=1) 
            # data, label = sliding_window_crop(data,label)
            length = data.shape[0]//N

            num_chunks = 2  # 就是你说的分 4 批
            chunks = torch.chunk(data, num_chunks, dim=0)
            outs = []
            
            
            # inference      
            with torch.no_grad():
                for x in chunks:
                    out = self.model(x)       # (b_i, T, C) 或类似
                    # out = out[:, -1, :]
                    # out = out.amax(dim=1)# 取最后一步 -> (b_i, C)
                    outs.append(out)
                output = torch.cat(outs, dim=0)
   
                # output = output[:,-1,:]#n*length,c
                output = output.reshape(N,length,-1)
                label = label.reshape(N,length)

            output = sfm(output)#N,length,C
            padd_output = torch.zeros(N,9000,output.shape[2])
            padd_output[:,:length,:] = output
            padd_output[:,length:,0] = 1.0 
            ####
            pre_o = get_interval_frm_frame_predict(padd_output[0].cpu().numpy())
            #print((padd_output.argmax(dim=2)[0,:length].cpu()==label.cpu()).float().mean())
            #print(pre_o)
            with open ('2.txt','w') as f:
                #a = padd_output.argmax(dim=2)
                #for i in range(l):
                #    f.write(str(a[0][i].cpu().numpy())+'\n')
                for i in pre_o:
                    f.write(str(i)+'\n')

            
            #time.sleep(100)
            
            result_frag.append(padd_output.clone())
            label_frag.append(label)
            start_frag = start_frag + start_pos.cpu().numpy().tolist()
            #print(video_name)
            video_name_frag = video_name_frag + list(video_name)
        
        #start_list = np.array(start_frag).astype(int)
        prob_seq = torch.cat(result_frag,dim=0)
        
        gt_dict = {}
        res_dict = {}

        gt_video_dict = []#mapv
        res_video_dict = []#mapv

        # print vid_name, prob_seq.shape
        filtered = False #drop some predictions with intervals less than 20
        for idx in range(len(video_name_frag)):
            # print(idx)
            prob_val = prob_seq[idx].cpu().numpy()
            prob_smooth = smoothing(prob_val[:,:label_frag[idx].shape[1]],10)
            
            #TIP sliding window method
            #pred_labels = get_interval_frm_frame_predict(prob_val[:,:label_frag[idx].shape[1]])

            #cvprw naive methods
            pred_labels = get_segments(prob_smooth, activity_threshold=0.4)
            pred_label_filted = []
            if filtered:
                for i in range(pred_labels.shape[0]):
                    s,e = pred_labels[i][1:3]
                    if e-s>=15:
                        pred_label_filted.append(pred_labels[i])
                pred_labels = np.array(pred_label_filted)
            #print(pred_labels)
            
            vid_name = video_name_frag[idx]

            label_path = '/root/autodl-tmp/Simple-Skeleton-Detection/data/Train_Label_PKU_final'
            labels = np.loadtxt(os.path.join(label_path, vid_name+'.txt'),delimiter=',').astype(int)#T,4 (label,start,end,confidence)
            # NOTE: for ground truth, action labels starts from 0, but for our detection, 0 indicates empty action
            # labels[:,0] = labels[:,0] #+ 1

            gt_dict[vid_name] = labels
            res_dict[vid_name] = pred_labels
            
            gt_per_video_dict = []
            res_per_video_dict = []#mapv
            for lab in labels:
                gt_per_video_dict.append([lab[0],lab[1],lab[2],lab[3],vid_name])
            
            for pred_lab in pred_labels:
                res_per_video_dict.append([pred_lab[0],pred_lab[1],pred_lab[2],pred_lab[3],vid_name])

            gt_video_dict.append(gt_per_video_dict)
            res_video_dict.append(res_per_video_dict)

        mapv = sum([ap(res_video_dict[x], 0.5, gt_video_dict[x]) for x in range(len(res_video_dict))])/len(res_video_dict)

        for thresh in [0.1, 0.3, 0.5]:
            # print(thresh)
            metrics = eval_detect_mAP(gt_dict, res_dict, minoverlap=thresh)#mapa
            print('thresh: ',thresh, metrics['map'])
            a = metrics['map']
            self.io.print_log(f'thresh: {thresh}, {a}')
        self.current_result = metrics['map']*100
        self.best_result = max(self.best_result,self.current_result)
        print ('mapa', metrics['map'])
        print('mapv', mapv)


            
    @staticmethod
    def get_parser(add_help=False):

        # parameter priority: command line > config > default
        parent_parser = Processor.get_parser(add_help=False)
        parser = argparse.ArgumentParser(
            add_help=add_help,
            parents=[parent_parser],
            description='Spatial Temporal Graph Convolution Network')

        # region arguments yapf: disable
        # evaluation
        parser.add_argument('--show_topk', type=int, default=[1, 5], nargs='+', help='which Top K accuracy will be shown')
        parser.add_argument('--warm_up_epoch', type=int, default=0, help='which Top K accuracy will be shown')
        # optim
        parser.add_argument('--base_lr', type=float, default=0.01, help='initial learning rate')
        parser.add_argument('--step', type=int, default=[], nargs='+', help='the epoch where optimizer reduce the learning rate')
        parser.add_argument('--optimizer', default='SGD', help='type of optimizer')
        parser.add_argument('--nesterov', type=str2bool, default=True, help='use nesterov or not')
        parser.add_argument('--weight_decay', type=float, default=0.0001, help='weight decay for optimizer')
        # endregion yapf: enable

        return parser