#!/usr/bin/env python
# -*- encoding: utf-8 -*-
'''
@File    :   train.py
@Time    :   2019/06/25 04:00:53
@Author  :   Liuyuqi 
@Version :   1.0
@Contact :   liuyuqi.gov@msn.cn
@License :   (C)Copyright 2019
@Desc    :   
'''

import torch
from sqlnet.utils import *
from sqlnet.model.sqlnet import SQLNet

import argparse

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('--bs', type=int, default=16, help='Batch size')#
    parser.add_argument('--epoch', type=int, default=100, help='Epoch number')
    parser.add_argument('--gpu', action='store_true', help='Whether use gpu to train')#
    parser.add_argument('--toy', action='store_true', help='If set, use small data for fast debugging')
    parser.add_argument('--ca', action='store_true', help='Whether use column attention')#
    parser.add_argument('--train_emb', action='store_true', help='Train word embedding for SQLNet')
    parser.add_argument('--restore', action='store_true', help='Whether restore trained model')
    parser.add_argument('--logdir', type=str, default='', help='Path of save experiment log')
    args = parser.parse_args()

    n_word=300
    if args.toy:
        use_small=True
        gpu=args.gpu
        batch_size=16
    else:
        use_small=False
        gpu=args.gpu
        batch_size=args.bs
    learning_rate = 1e-3

    # load dataset 加载训练数据和测试数据
    train_sql, train_table, train_db, dev_sql, dev_table, dev_db = load_dataset(use_small=use_small)

    # word_emb 字典类型。
    word_emb = load_word_emb('data/char_embedding.json')
    model = SQLNet(word_emb, N_word=n_word, use_ca=args.ca, gpu=gpu, trainable_emb=args.train_emb)
    optimizer = torch.optim.Adam(model.parameters(), lr=learning_rate, weight_decay=0)

    if args.restore:
        model_path= 'saved_model/best_model'
        print ("Loading trained model from %s" % model_path)
        model.load_state_dict(torch.load(model_path))

    # used to record best score of each sub-task
    best_sn, best_sc, best_sa, best_wn, best_wc, best_wo, best_wv, best_wr = 0, 0, 0, 0, 0, 0, 0, 0
    best_sn_idx, best_sc_idx, best_sa_idx, best_wn_idx, best_wc_idx, best_wo_idx, best_wv_idx, best_wr_idx = 0, 0, 0, 0, 0, 0, 0, 0
    best_lf, best_lf_idx = 0.0, 0
    best_ex, best_ex_idx = 0.0, 0

    print ("#"*20+"  Star to Train  " + "#"*20)
    for i in range(args.epoch):# range(100)
        print ('Epoch %d'%(i+1))
        # train on the train dataset
        train_loss = epoch_train(model, optimizer, batch_size, train_sql, train_table)
        # evaluate on the dev dataset
        dev_acc = epoch_acc(model, batch_size, dev_sql, dev_table, dev_db)
        # accuracy of each sub-task
        print ('Sel-Num: %.3f, Sel-Col: %.3f, Sel-Agg: %.3f, W-Num: %.3f, W-Col: %.3f, W-Op: %.3f, W-Val: %.3f, W-Rel: %.3f'%(
            dev_acc[0][0], dev_acc[0][1], dev_acc[0][2], dev_acc[0][3], dev_acc[0][4], dev_acc[0][5], dev_acc[0][6], dev_acc[0][7]))
        # save the best model
        if dev_acc[1] > best_lf:
            best_lf = dev_acc[1]
            best_lf_idx = i + 1
            torch.save(model.state_dict(), 'saved_model/best_model')
        if dev_acc[2] > best_ex:
            best_ex = dev_acc[2]
            best_ex_idx = i + 1

        # record the best score of each sub-task
        if True:
            if dev_acc[0][0] > best_sn:
                best_sn = dev_acc[0][0]
                best_sn_idx = i+1
            if dev_acc[0][1] > best_sc:
                best_sc = dev_acc[0][1]
                best_sc_idx = i+1
            if dev_acc[0][2] > best_sa:
                best_sa = dev_acc[0][2]
                best_sa_idx = i+1
            if dev_acc[0][3] > best_wn:
                best_wn = dev_acc[0][3]
                best_wn_idx = i+1
            if dev_acc[0][4] > best_wc:
                best_wc = dev_acc[0][4]
                best_wc_idx = i+1
            if dev_acc[0][5] > best_wo:
                best_wo = dev_acc[0][5]
                best_wo_idx = i+1
            if dev_acc[0][6] > best_wv:
                best_wv = dev_acc[0][6]
                best_wv_idx = i+1
            if dev_acc[0][7] > best_wr:
                best_wr = dev_acc[0][7]
                best_wr_idx = i+1
        print ('Train loss = %.3f' % train_loss)
        print ('Dev Logic Form Accuracy: %.3f, Execution Accuracy: %.3f' % (dev_acc[1], dev_acc[2]))
        print ('Best Logic Form: %.3f at epoch %d' % (best_lf, best_lf_idx))
        print ('Best Execution: %.3f at epoch %d' % (best_ex, best_ex_idx))
        if (i+1) % 10 == 0:
            print ('Best val acc: %s\nOn epoch individually %s'%(
                    (best_sn, best_sc, best_sa, best_wn, best_wc, best_wo, best_wv),
                    (best_sn_idx, best_sc_idx, best_sa_idx, best_wn_idx, best_wc_idx, best_wo_idx, best_wv_idx)))