"""
######################## inference lenet example ########################
inference lenet according to model file
"""

"""
######################## 推理环境使用说明 ########################
1、在推理环境中，需要将数据集从obs拷贝到推理镜像中，推理完以后，需要将输出的结果拷贝到obs.
(1)将数据集从obs拷贝到推理镜像中：
    obs_data_url = args.data_url
        args.data_url = '/home/work/user-job-dir/data/'
        if not os.path.exists(args.data_url):
            os.mkdir(args.data_url)
    try:     
        mox.file.copy_parallel(obs_data_url, args.data_url)
        print("Successfully Download {} to {}".format(obs_data_url,
                                                        args.data_url))
    except Exception as e:
        print('moxing download {} to {} failed: '.format(
            obs_data_url, args.data_url) + str(e))

(2)将模型文件从obs拷贝到推理镜像中：
    obs_ckpt_url = args.ckpt_url
    args.ckpt_url = '/home/work/user-job-dir/checkpoint.ckpt'
    try:
        mox.file.copy(obs_ckpt_url, args.ckpt_url)
        print("Successfully Download {} to {}".format(obs_ckpt_url,
                                                      args.ckpt_url))
    except Exception as e:
        print('moxing download {} to {} failed: '.format(
            obs_ckpt_url, args.ckpt_url) + str(e))      

(3)将输出的结果拷贝回obs：
    obs_result_url = args.result_url
        args.result_url = '/home/work/user-job-dir/result/'
        if not os.path.exists(args.result_url):
            os.mkdir(args.result_url)
    try:
        mox.file.copy_parallel(args.result_url, obs_result_url)
        print("Successfully Upload {} to {}".format(args.result_url, obs_result_url))
    except Exception as e:
        print('moxing upload {} to {} failed: '.format(args.result_url, obs_result_url) + str(e))
详细代码可参考以下示例代码：
"""

import os
import argparse
import moxing as mox
import mindspore.nn as nn
from mindspore import context
from mindspore.train.serialization import load_checkpoint, load_param_into_net
from mindspore.train import Model
from mindspore.nn.metrics import Accuracy
from mindspore import Tensor
import numpy as np
from glob import glob
from dataset import create_dataset
from config import mnist_cfg as cfg
from lenet import LeNet5

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='MindSpore Lenet Example')
    parser.add_argument('--device_target', type=str, default="Ascend", choices=['Ascend', 'GPU', 'CPU'],
                        help='device where the code will be implemented (default: Ascend)')
    parser.add_argument('--data_url',
                    type=str,
                    default="./Data",
                    help='path where the dataset is saved')      
    parser.add_argument('--ckpt_url',
                    help='model to save/load',
                    default='./ckpt_url')  
    parser.add_argument('--result_url',
                    help='result folder to save/load',
                    default='./result')               

    args = parser.parse_args()
    
    #将数据集从obs拷贝到推理镜像中：
    obs_data_url = args.data_url
    args.data_url = '/home/work/user-job-dir/data/'
    if not os.path.exists(args.data_url):
        os.mkdir(args.data_url)
    try:    
        mox.file.copy_parallel(obs_data_url, args.data_url)
        print("Successfully Download {} to {}".format(obs_data_url,
                                                      args.data_url))
    except Exception as e:
        print('moxing download {} to {} failed: '.format(
            obs_data_url, args.data_url) + str(e))

    #对文件夹进行操作，请使用mox.file.copy_parallel。如果拷贝一个文件。请使用mox.file.copy对文件操作，本次操作是对文件进行操作
    #将模型文件从obs拷贝到推理镜像中：
    obs_ckpt_url = args.ckpt_url
    args.ckpt_url = '/home/work/user-job-dir/checkpoint.ckpt'
    try:
        mox.file.copy(obs_ckpt_url, args.ckpt_url)
        print("Successfully Download {} to {}".format(obs_ckpt_url,
                                                      args.ckpt_url))
    except Exception as e:
        print('moxing download {} to {} failed: '.format(
            obs_ckpt_url, args.ckpt_url) + str(e))

    #设置输出路径result_url
    obs_result_url = args.result_url
    args.result_url = '/home/work/user-job-dir/result/'
    if not os.path.exists(args.result_url):
        os.mkdir(args.result_url)

    args.dataset_path = args.data_url
    args.save_checkpoint_path = args.ckpt_url

    context.set_context(mode=context.GRAPH_MODE, device_target=args.device_target)

    network = LeNet5(cfg.num_classes)
    net_loss = nn.SoftmaxCrossEntropyWithLogits(sparse=True, reduction="mean")
    repeat_size = cfg.epoch_size
    net_opt = nn.Momentum(network.trainable_params(), cfg.lr, cfg.momentum)
    model = Model(network, net_loss, net_opt, metrics={"Accuracy": Accuracy()})

    print("============== Starting Testing ==============")
    args.load_ckpt_url = os.path.join(args.save_checkpoint_path)
    print("args.load_ckpt_url  is：{}", args.load_ckpt_url )
    param_dict = load_checkpoint(args.load_ckpt_url )
    load_param_into_net(network, param_dict)
    # 定义测试数据集，batch_size设置为1，则取出一张图片
    ds_test = create_dataset(os.path.join(args.dataset_path, "test"), batch_size=1).create_dict_iterator()
    data = next(ds_test)

    # images为测试图片，labels为测试图片的实际分类
    images = data["image"].asnumpy()
    labels = data["label"].asnumpy()
    print('Tensor:', Tensor(data['image']))

    # 使用函数model.predict预测image对应分类
    output = model.predict(Tensor(data['image']))
    predicted = np.argmax(output.asnumpy(), axis=1)
    pred = np.argmax(output.asnumpy(), axis=1)
    print('predicted:', predicted)
    print('pred:', pred)

    # 输出预测分类与实际分类,并输出到result_url
    print(f'Predicted: "{predicted[0]}", Actual: "{labels[0]}"')
    filename = 'result.txt'
    file_path = os.path.join(args.result_url, filename)
    with open(file_path, 'a+') as file:
            file.write("    {}: {:.2f} \n".format("Predicted", predicted[0]))

    # Upload results to obs
    ######################## 将输出的结果拷贝到obs（固定写法） ########################   
    # 把推理后的结果从本地的运行环境拷贝回obs，在启智平台相对应的推理任务中会提供下载
    try:
        mox.file.copy_parallel(args.result_url, obs_result_url)
        print("Successfully Upload {} to {}".format(args.result_url, obs_result_url))
    except Exception as e:
        print('moxing upload {} to {} failed: '.format(args.result_url, obs_result_url) + str(e))
    ######################## 将输出的模型拷贝到obs ########################