# Copyright (c) Microsoft Corporation
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#
# MIT License
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# to any person obtaining a copy of this software and associated
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# BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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import json
import os
import shutil
import string
from subprocess import Popen, PIPE, call
import tempfile
from nni_annotation import *
import random
from .launcher_utils import validate_all_content
from .rest_utils import rest_put, rest_post, check_rest_server, check_rest_server_quick, check_response
from .url_utils import cluster_metadata_url, experiment_url
from .config_utils import Config
from .common_utils import get_yml_content, get_json_content, print_error, print_normal, detect_process
from .constants import EXPERIMENT_SUCCESS_INFO, STDOUT_FULL_PATH, STDERR_FULL_PATH, LOG_DIR, REST_PORT, ERROR_INFO, NORMAL_INFO
from .webui_utils import start_web_ui, check_web_ui

def start_rest_server(port, platform, mode, experiment_id=None):
    '''Run nni manager process'''
    print_normal('Checking experiment...')
    nni_config = Config()
    rest_port = nni_config.get_config('restServerPort')
    running, _ = check_rest_server_quick(rest_port)
    if rest_port and running:
        print_error('There is an experiment running, please stop it first...')
        print_normal('You can use \'nnictl stop\' command to stop an experiment!')
        exit(0)

    print_normal('Starting restful server...')
    manager = os.environ.get('NNI_MANAGER', 'nnimanager')
    cmds = [manager, '--port', str(port), '--mode', platform, '--start_mode', mode]
    if mode == 'resume':
        cmds += ['--experiment_id', experiment_id]
    if not os.path.exists(LOG_DIR):
        os.makedirs(LOG_DIR)
    stdout_file = open(STDOUT_FULL_PATH, 'a+')
    stderr_file = open(STDERR_FULL_PATH, 'a+')
    process = Popen(cmds, stdout=stdout_file, stderr=stderr_file)
    return process

def set_trial_config(experiment_config, port):
    '''set trial configuration'''
    request_data = dict()
    value_dict = dict()
    value_dict['command'] = experiment_config['trial']['command']
    value_dict['codeDir'] = experiment_config['trial']['codeDir']
    value_dict['gpuNum'] = experiment_config['trial']['gpuNum']
    if experiment_config['trial'].get('cpuNum'):
        value_dict['cpuNum'] = experiment_config['trial']['cpuNum']
    if experiment_config['trial'].get('memoryMB'):
        value_dict['memoryMB'] = experiment_config['trial']['memoryMB']
    if experiment_config['trial'].get('image'):
        value_dict['image'] = experiment_config['trial']['image']
    if experiment_config['trial'].get('dataDir'):
        value_dict['dataDir'] = experiment_config['trial']['dataDir']
    if experiment_config['trial'].get('outputDir'):
        value_dict['outputDir'] = experiment_config['trial']['outputDir']
    request_data['trial_config'] = value_dict
    response = rest_put(cluster_metadata_url(port), json.dumps(request_data), 20)
    if check_response(response):
        return True
    else:
        with open(STDERR_FULL_PATH, 'a+') as fout:
            fout.write(json.dumps(json.loads(response.text), indent=4, sort_keys=True, separators=(',', ':')))
        return False

def set_local_config(experiment_config, port):
    '''set local configuration'''
    return set_trial_config(experiment_config, port)

def set_remote_config(experiment_config, port):
    '''Call setClusterMetadata to pass trial'''
    #set machine_list
    request_data = dict()
    request_data['machine_list'] = experiment_config['machineList']
    response = rest_put(cluster_metadata_url(port), json.dumps(request_data), 20)
    err_message = ''
    if not response or not check_response(response):
        if response is not None:
            err_message = response.text
            with open(STDERR_FULL_PATH, 'a+') as fout:
                fout.write(json.dumps(json.loads(err_message), indent=4, sort_keys=True, separators=(',', ':')))
        return False, err_message

    #set trial_config
    return set_trial_config(experiment_config, port), err_message

def set_pai_config(experiment_config, port):
    '''set pai configuration''' 
    pai_config_data = dict()
    pai_config_data['pai_config'] = experiment_config['paiConfig']
    response = rest_put(cluster_metadata_url(port), json.dumps(pai_config_data), 20)
    err_message = ''
    if not response or not response.status_code == 200:
        if response is not None:
            err_message = response.text
        return False, err_message

    #set trial_config
    return set_trial_config(experiment_config, port), err_message

def set_experiment(experiment_config, mode, port):
    '''Call startExperiment (rest POST /experiment) with yaml file content'''
    request_data = dict()
    request_data['authorName'] = experiment_config['authorName']
    request_data['experimentName'] = experiment_config['experimentName']
    request_data['trialConcurrency'] = experiment_config['trialConcurrency']
    request_data['maxExecDuration'] = experiment_config['maxExecDuration']
    request_data['maxTrialNum'] = experiment_config['maxTrialNum']
    request_data['searchSpace'] = experiment_config.get('searchSpace')
    request_data['tuner'] = experiment_config['tuner']
    if 'assessor' in experiment_config:
        request_data['assessor'] = experiment_config['assessor']

    request_data['clusterMetaData'] = []
    if experiment_config['trainingServicePlatform'] == 'local':
        request_data['clusterMetaData'].append(
            {'key':'codeDir', 'value':experiment_config['trial']['codeDir']})
        request_data['clusterMetaData'].append(
            {'key': 'command', 'value': experiment_config['trial']['command']})
    elif experiment_config['trainingServicePlatform'] == 'remote':
        request_data['clusterMetaData'].append(
            {'key': 'machine_list', 'value': experiment_config['machineList']})
        value_dict = dict()
        value_dict['command'] = experiment_config['trial']['command']
        value_dict['codeDir'] = experiment_config['trial']['codeDir']
        value_dict['gpuNum'] = experiment_config['trial']['gpuNum']
        request_data['clusterMetaData'].append(
            {'key': 'trial_config', 'value': value_dict})
    elif experiment_config['trainingServicePlatform'] == 'pai':
        request_data['clusterMetaData'].append(
            {'key': 'pai_config', 'value': experiment_config['paiConfig']})
        value_dict = dict()
        value_dict['command'] = experiment_config['trial']['command']
        value_dict['codeDir'] = experiment_config['trial']['codeDir']
        value_dict['gpuNum'] = experiment_config['trial']['gpuNum']
        if experiment_config['trial'].get('cpuNum'):
            value_dict['cpuNum'] = experiment_config['trial']['cpuNum']
        if experiment_config['trial'].get('memoryMB'):
            value_dict['memoryMB'] = experiment_config['trial']['memoryMB']
        if experiment_config['trial'].get('image'):
            value_dict['image'] = experiment_config['trial']['image']
        if experiment_config['trial'].get('dataDir'):
            value_dict['dataDir'] = experiment_config['trial']['dataDir']
        if experiment_config['trial'].get('outputDir'):
            value_dict['outputDir'] = experiment_config['trial']['outputDir']
        request_data['clusterMetaData'].append(
            {'key': 'trial_config', 'value': value_dict})

    response = rest_post(experiment_url(port), json.dumps(request_data), 20)
    if check_response(response):
        return response
    else:
        with open(STDERR_FULL_PATH, 'a+') as fout:
            fout.write(json.dumps(json.loads(response.text), indent=4, sort_keys=True, separators=(',', ':')))
        return None

def launch_experiment(args, experiment_config, mode, webuiport, experiment_id=None):
    '''follow steps to start rest server and start experiment'''
    nni_config = Config()
    #Check if there is an experiment running
    origin_rest_pid = nni_config.get_config('restServerPid')
    if origin_rest_pid and detect_process(origin_rest_pid):
        print_error('There is an experiment running, please stop it first...')
        print_normal('You can use \'nnictl stop\' command to stop an experiment!')
        exit(0)
    # start rest server
    rest_process = start_rest_server(REST_PORT, experiment_config['trainingServicePlatform'], mode, experiment_id)
    nni_config.set_config('restServerPid', rest_process.pid)
    # Deal with annotation
    if experiment_config.get('useAnnotation'):
        path = os.path.join(tempfile.gettempdir(), 'nni', 'annotation', ''.join(random.sample(string.ascii_letters + string.digits, 8)))
        if os.path.isdir(path):
            shutil.rmtree(path)
        os.makedirs(path)
        expand_annotations(experiment_config['trial']['codeDir'], path)
        experiment_config['trial']['codeDir'] = path
        search_space = generate_search_space(experiment_config['trial']['codeDir'])
        experiment_config['searchSpace'] = json.dumps(search_space)
        assert search_space, ERROR_INFO % 'Generated search space is empty'
    elif experiment_config.get('searchSpacePath'):
            search_space = get_json_content(experiment_config.get('searchSpacePath'))
            experiment_config['searchSpace'] = json.dumps(search_space)
    else:
        experiment_config['searchSpace'] = json.dumps('')

    # check rest server
    print_normal('Checking restful server...')
    running, _ = check_rest_server(REST_PORT)
    if running:
        print_normal('Restful server start success!')
    else:
        print_error('Restful server start failed!')
        try:
            cmds = ['pkill', '-P', str(rest_process.pid)]
            call(cmds)
        except Exception:
            raise Exception(ERROR_INFO % 'Rest server stopped!')
        exit(0)

    # set remote config
    if experiment_config['trainingServicePlatform'] == 'remote':
        print_normal('Setting remote config...')
        config_result, err_msg = set_remote_config(experiment_config, REST_PORT)
        if config_result:
            print_normal('Success!')
        else:
            print_error('Failed! Error is: {}'.format(err_msg))
            try:
                cmds = ['pkill', '-P', str(rest_process.pid)]
                call(cmds)
            except Exception:
                raise Exception(ERROR_INFO % 'Rest server stopped!')
            exit(0)

    # set local config
    if experiment_config['trainingServicePlatform'] == 'local':
        print_normal('Setting local config...')
        if set_local_config(experiment_config, REST_PORT):
            print_normal('Success!')
        else:
            print_error('Failed!')
            try:
                cmds = ['pkill', '-P', str(rest_process.pid)]
                call(cmds)
            except Exception:
                raise Exception(ERROR_INFO % 'Rest server stopped!')
            exit(0)
    
    #set pai config
    if experiment_config['trainingServicePlatform'] == 'pai':
        print_normal('Setting pai config...')
        config_result, err_msg = set_pai_config(experiment_config, REST_PORT)
        if config_result:
            print_normal('Success!')
        else:
            print_error('Failed! Error is: {}'.format(err_msg))
            try:
                cmds = ['pkill', '-P', str(rest_process.pid)]
                call(cmds)
            except Exception:
                raise Exception(ERROR_INFO % 'Rest server stopped!')
            exit(0)

    # start a new experiment
    print_normal('Starting experiment...')
    response = set_experiment(experiment_config, mode, REST_PORT)
    if response:
        if experiment_id is None:
            experiment_id = json.loads(response.text).get('experiment_id')
        nni_config.set_config('experimentId', experiment_id)
    else:
        print_error('Failed!')
        try:
            cmds = ['pkill', '-P', str(rest_process.pid)]
            call(cmds)
        except Exception:
            raise Exception(ERROR_INFO % 'Rest server stopped!')
        exit(0)

    #start webui
    print_normal('Checking web ui...')
    if check_web_ui():
        print_error('{0} {1}'.format(' '.join(nni_config.get_config('webuiUrl')),'is being used, please stop it first!'))
        print_normal('You can use \'nnictl webui stop\' to stop old web ui process...')
    else:
        print_normal('Starting web ui...')
        webui_process = start_web_ui(webuiport)
        if webui_process:
            nni_config.set_config('webuiPid', webui_process.pid)
            print_normal('Starting web ui success!')
            print_normal('{0} {1}'.format('Web UI url:', '   '.join(nni_config.get_config('webuiUrl'))))

    print_normal(EXPERIMENT_SUCCESS_INFO % (experiment_id, REST_PORT))


def resume_experiment(args):
    '''resume an experiment'''
    nni_config = Config()
    experiment_config = nni_config.get_config('experimentConfig')
    experiment_id = nni_config.get_config('experimentId')
    launch_experiment(args, experiment_config, 'resume', args.webuiport, experiment_id)

def create_experiment(args):
    '''start a new experiment'''
    nni_config = Config()
    config_path = os.path.abspath(args.config)
    experiment_config = get_yml_content(config_path)
    validate_all_content(experiment_config, config_path)

    nni_config.set_config('experimentConfig', experiment_config)
    launch_experiment(args, experiment_config, 'new', args.webuiport)
    nni_config.set_config('restServerPort', REST_PORT)
