#! python3
# -*- encoding: utf-8 -*-

import torch
import torch.nn.functional as F
import pandas as pd
import sys
import os


from transformers.utils.hub import cached_file

resolved_module_file = cached_file(
    'Cainiao-AI/G2PTL',
    'htc_mask_dict.pkl',
)

htc_weights = [0.067, 0.133, 0.2, 0.267, 0.333]
htc_mask_dict = pd.read_pickle(resolved_module_file)
import numpy as np
import operator
def calculate_multi_htc_acc_batch(predicted_htc, y, sequence_len = 6):
    acc_cnt = np.array([0, 0, 0, 0, 0])
    y = y.view(-1, sequence_len, 5).tolist()
    predicted = np.array(predicted_htc).reshape(-1, sequence_len, 5).tolist()
    batch_size = len(y)
    total_cnt = np.array([0, 0, 0, 0, 0])
    for batch_i in range(batch_size):
        for index, s2 in enumerate(y[batch_i]):
            for c, i in enumerate(range(5)):
                y_l10 = y[batch_i][index][:i+1]
                p_l10 = predicted[batch_i][index][:i+1]
                if -100 in y_l10:
                    break
                if operator.eq(y_l10, p_l10):
                    acc_cnt[c] += 1
                total_cnt[c] += 1
    return acc_cnt, total_cnt
    

class HTCLoss(torch.nn.Module):
    def __init__(self, device, reduction='mean', using_htc = True):
        super(HTCLoss, self).__init__()
        self.reduction = reduction
        self.htc_weights = htc_weights
        self.device = device
        self.using_htc = using_htc
        self.htc_mask_dict = htc_mask_dict
        for key, value in self.htc_mask_dict.items():
            self.htc_mask_dict[key] = torch.tensor(value).clone().detach().to(self.device)

    def forward(self, logits, target):  
        target = target.reshape(-1, 1)
        target_mask = target != -100
        target_mask = target_mask.squeeze()
        target_mask_idx = torch.where(target == -100)
        target_new = target.clone()
        target_new[target_mask_idx] = 0
        predict_res = []
        if not self.using_htc:
            log_pro = -1.0 * F.log_softmax(logits, dim=1)
        else:
            logits_reshaped = logits.clone() 
            logits_reshaped = logits_reshaped.reshape(-1, 5, 100) 
            _, aa_predicted = torch.max(logits_reshaped[:,0,1:32], 1) 
            aa_predicted += 1
            logits_new = -5 * torch.ones_like(logits_reshaped).to(self.device)
            logits_new[:,0,1:32] = logits_reshaped[:,0,1:32]
            for sample_idx, aa in enumerate(aa_predicted):
                # Using mask_dict to get candidates for the next hierarchical
                bb_idx = htc_mask_dict['{:02d}'.format(aa)]
                _, bb_idy = torch.max(logits_reshaped[sample_idx,1,bb_idx], 0)
                bb = bb_idx[bb_idy]
                logits_new[sample_idx,1,bb_idx] = logits_reshaped[sample_idx,1,bb_idx]
                cc_idx = htc_mask_dict['{:02d}{:02d}'.format(aa, bb)]
                _, cc_idy = torch.max(logits_reshaped[sample_idx,2,cc_idx], 0)
                logits_new[sample_idx,2,cc_idx] = logits_reshaped[sample_idx,2,cc_idx]
                cc = cc_idx[cc_idy]
                d_idx = htc_mask_dict['{:02d}{:02d}{:02d}'.format(aa, bb, cc)]
                _, d_idy = torch.max(logits_reshaped[sample_idx,3,d_idx], 0)
                logits_new[sample_idx,3,d_idx] = logits_reshaped[sample_idx,3,d_idx]
                d = d_idx[d_idy]
                ee_idx = htc_mask_dict['{:02d}{:02d}{:02d}{:01d}'.format(aa, bb, cc, d)]
                _, ee_idy = torch.max(logits_reshaped[sample_idx,4,ee_idx], 0)
                logits_new[sample_idx,4,ee_idx] = logits_reshaped[sample_idx,4,ee_idx]
                ee = ee_idx[ee_idy]
                predict_res.extend([aa.item(), bb.item(), cc.item(), d.item(), ee.item()])

            logits_new = logits_new.reshape(-1, 100)
            log_pro = -1.0 * F.log_softmax(logits_new, dim=1)
        logits = logits.contiguous().view(-1, 100)
        one_hot = torch.zeros(logits.shape[0], logits.shape[1]).to(self.device)  # .cuda()
        one_hot = one_hot.scatter_(1, target_new, 1)
        loss = torch.mul(log_pro, one_hot).sum(dim=1)
        loss = loss*target_mask
        bs = int(loss.shape[0] / 5)
        w_loss = []
        for i in range(bs):
            w_loss.extend(self.htc_weights)
        w_loss = torch.FloatTensor(w_loss).to(self.device)
        loss = loss.mul(w_loss) * 5
        if self.reduction == 'mean':
            loss = loss[torch.where(loss>0)].mean()
        elif self.reduction == 'sum':
            loss = loss[torch.where(loss>0)].sum()
        return loss, predict_res

    def get_htc_code(self, logits): 
        logits_reshaped = logits.clone() 
        logits_reshaped = logits_reshaped.reshape(-1, 5, 100) 
        _, aa_predicted = torch.max(logits_reshaped[:,0,1:32], 1) 
        aa_predicted += 1
        logits_new = -5 * torch.ones_like(logits_reshaped).to(self.device)
        logits_new[:,0,1:32] = logits_reshaped[:,0,1:32]
        predict_res = []
        for sample_idx, aa in enumerate(aa_predicted):
            bb_idx = htc_mask_dict['{:02d}'.format(aa)]
            _, bb_idy = torch.max(logits_reshaped[sample_idx,1,bb_idx], 0)
            bb = bb_idx[bb_idy]
            logits_new[sample_idx,1,bb_idx] = logits_reshaped[sample_idx,1,bb_idx]
            cc_idx = htc_mask_dict['{:02d}{:02d}'.format(aa, bb)]
            _, cc_idy = torch.max(logits_reshaped[sample_idx,2,cc_idx], 0)
            logits_new[sample_idx,2,cc_idx] = logits_reshaped[sample_idx,2,cc_idx]
            cc = cc_idx[cc_idy]
            d_idx = htc_mask_dict['{:02d}{:02d}{:02d}'.format(aa, bb, cc)]
            _, d_idy = torch.max(logits_reshaped[sample_idx,3,d_idx], 0)
            logits_new[sample_idx,3,d_idx] = logits_reshaped[sample_idx,3,d_idx]
            d = d_idx[d_idy]
            ee_idx = htc_mask_dict['{:02d}{:02d}{:02d}{:01d}'.format(aa, bb, cc, d)]
            _, ee_idy = torch.max(logits_reshaped[sample_idx,4,ee_idx], 0)
            logits_new[sample_idx,4,ee_idx] = logits_reshaped[sample_idx,4,ee_idx]
            ee = ee_idx[ee_idy]
            predict_res.extend([aa.item(), bb.item(), cc.item(), d.item(), ee.item()])
        return predict_res