# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from paddle_fl.core.trainer.fl_trainer import FLTrainerFactory
from paddle_fl.core.master.fl_job import FLRunTimeJob
import numpy
import sys
import logging
import paddle
import paddle.fluid as fluid
import time
import datetime
import math
import hashlib
import hmac

logging.basicConfig(
    filename="log/test.log",
    filemode="w",
    format="%(asctime)s %(name)s:%(levelname)s:%(message)s",
    datefmt="%d-%M-%Y %H:%M:%S",
    level=logging.DEBUG)
logger = logging.getLogger("FLTrainer")

BATCH_SIZE = 64

train_reader = paddle.batch(
    paddle.reader.shuffle(
        paddle.dataset.mnist.train(), buf_size=500),
    batch_size=BATCH_SIZE)
test_reader = paddle.batch(paddle.dataset.mnist.test(), batch_size=BATCH_SIZE)

trainer_num = 2
trainer_id = int(sys.argv[1])  # trainer id for each guest

job_path = "fl_job_config"
job = FLRunTimeJob()
job.load_trainer_job(job_path, trainer_id)
job._scheduler_ep = "127.0.0.1:9091"  # Inform the scheduler IP to trainer
trainer = FLTrainerFactory().create_fl_trainer(job)
trainer.trainer_id = trainer_id
trainer._current_ep = "127.0.0.1:{}".format(9000 + trainer_id)
trainer.trainer_num = trainer_num
trainer.key_dir = "./keys/"
trainer.start()

output_folder = "fl_model"
epoch_id = 0
step_i = 0

inputs = fluid.layers.data(name='x', shape=[1, 28, 28], dtype='float32')
label = fluid.layers.data(name='y', shape=[1], dtype='int64')
feeder = fluid.DataFeeder(feed_list=[inputs, label], place=fluid.CPUPlace())

# for test
test_program = trainer._main_program.clone(for_test=True)


def train_test(train_test_program, train_test_feed, train_test_reader):
    acc_set = []
    avg_loss_set = []
    for test_data in train_test_reader():
        acc_np, avg_loss_np = trainer.exe.run(
            program=train_test_program,
            feed=train_test_feed.feed(test_data),
            fetch_list=["accuracy_0.tmp_0", "mean_0.tmp_0"])
        acc_set.append(float(acc_np))
        avg_loss_set.append(float(avg_loss_np))
    acc_val_mean = numpy.array(acc_set).mean()
    avg_loss_val_mean = numpy.array(avg_loss_set).mean()
    return avg_loss_val_mean, acc_val_mean


# for test

while not trainer.stop():
    epoch_id += 1
    print("epoch %d start train" % (epoch_id))

    for data in train_reader():
        step_i += 1
        trainer.step_id = step_i
        accuracy, = trainer.run(feed=feeder.feed(data),
                                fetch=["accuracy_0.tmp_0"])
        if step_i % 100 == 0:
            print("Epoch: {0}, step: {1}, accuracy: {2}".format(
                epoch_id, step_i, accuracy[0]))

    print(step_i)
    avg_loss_val, acc_val = train_test(
        train_test_program=test_program,
        train_test_reader=test_reader,
        train_test_feed=feeder)
    print("Test with Epoch %d, avg_cost: %s, acc: %s" %
          (epoch_id, avg_loss_val, acc_val))

    if epoch_id > 40:
        break
    if epoch_id % 5 == 0:
        trainer.save_inference_program(output_folder)