# Copyright (c) Microsoft Corporation. All rights reserved.
#
# MIT License
#
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# associated documentation files (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge, publish, distribute,
# sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or
# substantial portions of the Software.
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# NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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# ==================================================================================================

import os
import json
import time
import json_tricks

from ..common import init_logger, env_args

_sysdir = os.environ['NNI_SYS_DIR']
if not os.path.exists(os.path.join(_sysdir, '.nni')):
    os.makedirs(os.path.join(_sysdir, '.nni'))
_metric_file = open(os.path.join(_sysdir, '.nni', 'metrics'), 'wb')

_outputdir = os.environ['NNI_OUTPUT_DIR']
if not os.path.exists(_outputdir):
    os.makedirs(_outputdir)
_log_file_path = os.path.join(_outputdir, 'trial.log')
init_logger(_log_file_path)

_multiphase = os.environ.get('MULTI_PHASE')

_param_index = 0

def request_next_parameter():
    metric = json_tricks.dumps({
        'trial_job_id': env_args.trial_job_id,
        'type': 'REQUEST_PARAMETER',
        'sequence': 0,
        'parameter_index': _param_index
    })
    send_metric(metric)

def get_next_parameter():
    global _param_index
    params_file_name = ''
    if _multiphase and (_multiphase == 'true' or _multiphase == 'True'):
        params_file_name = ('parameter_{}.cfg'.format(_param_index), 'parameter.cfg')[_param_index == 0]
    else:
        if _param_index > 0:
            return None
        elif _param_index == 0:
            params_file_name = 'parameter.cfg'
        else:
            raise AssertionError('_param_index value ({}) should >=0'.format(_param_index))
    
    params_filepath = os.path.join(_sysdir, params_file_name)
    if not os.path.isfile(params_filepath):
        request_next_parameter()
    while not os.path.isfile(params_filepath):
        time.sleep(3)
    params_file = open(params_filepath, 'r')
    params = json.load(params_file)
    _param_index += 1
    return params

def send_metric(string):
    data = (string + '\n').encode('utf8')
    assert len(data) < 1000000, 'Metric too long'
    _metric_file.write(b'ME%06d%b' % (len(data), data))
    _metric_file.flush()

def get_sequence_id():
    with open(os.path.join(_sysdir, '.nni', 'sequence_id'), 'r') as f:
        return int(f.read().strip())
