# Copyright (c) Microsoft Corporation
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#
# MIT License
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import os
import psutil
import json
import datetime
import time
from subprocess import call, check_output
from .rest_utils import rest_get, rest_delete, check_rest_server_quick, check_response
from .config_utils import Config, Experiments
from .url_utils import trial_jobs_url, experiment_url, trial_job_id_url
from .constants import NNICTL_HOME_DIR, EXPERIMENT_INFORMATION_FORMAT, EXPERIMENT_DETAIL_FORMAT
import time
from .common_utils import print_normal, print_error, print_warning, detect_process

def check_experiment_id(args):
    '''check if the id is valid
    '''
    experiment_config = Experiments()
    experiment_dict = experiment_config.get_all_experiments()
    if not experiment_dict:
        print_normal('There is no experiment running...')
        exit(1)
    if not args.id:
        running_experiment_list = []
        for key in experiment_dict.keys():
            if experiment_dict[key]['status'] == 'running':
                running_experiment_list.append(key)
        if len(running_experiment_list) > 1:
            print_error('There are multiple experiments running, please set the experiment id...')
            experiment_information = ""
            for key in running_experiment_list:
                experiment_information += (EXPERIMENT_DETAIL_FORMAT % (key, experiment_dict[key]['status'], \
                experiment_dict[key]['startTime'], experiment_dict[key]['endTime']))
            print(EXPERIMENT_INFORMATION_FORMAT % experiment_information)
            exit(1)
        elif not running_experiment_list:
            print_error('There is no experiment running!')
            exit(1)
        else:
            return running_experiment_list[0]
    if experiment_dict.get(args.id):
        return args.id
    else:
        print_error('Id not correct!')
        exit(1)

def parse_ids(args):
    '''Parse the arguments for nnictl stop
    1.If there is an id specified, return the corresponding id
    2.If there is no id specified, and there is an experiment running, return the id, or return Error
    3.If the id matches an experiment, nnictl will return the id.
    4.If the id ends with *, nnictl will match all ids matchs the regular
    5.If the id does not exist but match the prefix of an experiment id, nnictl will return the matched id
    6.If the id does not exist but match multiple prefix of the experiment ids, nnictl will give id information
    '''
    experiment_config = Experiments()
    experiment_dict = experiment_config.get_all_experiments()
    if not experiment_dict:
        print_normal('Experiment is not running...')
        return None
    result_list = []
    running_experiment_list = []
    for key in experiment_dict.keys():
        if experiment_dict[key]['status'] == 'running':
            running_experiment_list.append(key)
    if not args.id:
        if len(running_experiment_list) > 1:
            print_error('There are multiple experiments running, please set the experiment id...')
            experiment_information = ""
            for key in running_experiment_list:
                experiment_information += (EXPERIMENT_DETAIL_FORMAT % (key, experiment_dict[key]['status'], \
                experiment_dict[key]['startTime'], experiment_dict[key]['endTime']))
            print(EXPERIMENT_INFORMATION_FORMAT % experiment_information)
            exit(1)
        else:
            result_list = running_experiment_list
    elif args.id == 'all':
        result_list = running_experiment_list
    elif args.id.endswith('*'):
        for id in running_experiment_list:
            if id.startswith(args.id[:-1]):
                result_list.append(id)
    elif args.id in running_experiment_list:
        result_list.append(args.id)
    else:
        for id in running_experiment_list:
            if id.startswith(args.id):
                result_list.append(id)
        if len(result_list) > 1:
            print_error(args.id + ' is ambiguous, please choose ' + ' '.join(result_list) )
            return None
    if not result_list:
        print_error('There are no experiments matched, please check experiment id...')
    return result_list

def get_config_filename(args):
    '''get the file name of config file'''
    experiment_id = check_experiment_id(args)
    experiment_config = Experiments()
    experiment_dict = experiment_config.get_all_experiments()
    return experiment_dict[experiment_id]['fileName']

def get_experiment_port(args):
    '''get the port of experiment'''
    experiment_id = check_experiment_id(args)
    experiment_config = Experiments()
    experiment_dict = experiment_config.get_all_experiments()
    return experiment_dict[experiment_id]['port']

def convert_time_stamp_to_date(content):
    '''Convert time stamp to date time format'''
    start_time_stamp = content.get('startTime')
    end_time_stamp = content.get('endTime')
    if start_time_stamp:
        start_time = datetime.datetime.utcfromtimestamp(start_time_stamp // 1000).strftime("%Y/%m/%d %H:%M:%S")
        content['startTime'] = str(start_time)
    if end_time_stamp:
        end_time = datetime.datetime.utcfromtimestamp(end_time_stamp // 1000).strftime("%Y/%m/%d %H:%M:%S")
        content['endTime'] = str(end_time)
    return content

def check_rest(args):
    '''check if restful server is running'''
    nni_config = Config(get_config_filename(args))
    rest_port = nni_config.get_config('restServerPort')
    running, _ = check_rest_server_quick(rest_port)
    if not running:
        print_normal('Restful server is running...')
    else:
        print_normal('Restful server is not running...')

def stop_experiment(args):
    '''Stop the experiment which is running'''
    experiment_id_list = parse_ids(args)
    if experiment_id_list:
        experiment_config = Experiments()
        experiment_dict = experiment_config.get_all_experiments()
        for experiment_id in experiment_id_list:
            print_normal('Stoping experiment %s' % experiment_id)
            nni_config = Config(experiment_dict[experiment_id]['fileName'])
            rest_port = nni_config.get_config('restServerPort')
            rest_pid = nni_config.get_config('restServerPid')
            if not detect_process(rest_pid):
                print_normal('Experiment is not running...')
                experiment_config.update_experiment(experiment_id, 'status', 'stopped')
                return
            running, _ = check_rest_server_quick(rest_port)
            stop_rest_result = True
            if running:
                response = rest_delete(experiment_url(rest_port), 20)
                if not response or not check_response(response):
                    print_error('Stop experiment failed!')
                    stop_rest_result = False
            #sleep to wait rest handler done
            time.sleep(3)
            rest_pid = nni_config.get_config('restServerPid')
            if rest_pid:
                cmds = ['pkill', '-P', str(rest_pid)]
                call(cmds)
            if stop_rest_result:
                print_normal('Stop experiment success!')
            experiment_config.update_experiment(experiment_id, 'status', 'stopped')
            time_now = time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time()))
            experiment_config.update_experiment(experiment_id, 'endTime', str(time_now))

def trial_ls(args):
    '''List trial'''
    nni_config = Config(get_config_filename(args))
    rest_port = nni_config.get_config('restServerPort')
    rest_pid = nni_config.get_config('restServerPid')
    if not detect_process(rest_pid):
        print_error('Experiment is not running...')
        return
    running, response = check_rest_server_quick(rest_port)
    if running:
        response = rest_get(trial_jobs_url(rest_port), 20)
        if response and check_response(response):
            content = json.loads(response.text)
            for index, value in enumerate(content):               
                content[index] = convert_time_stamp_to_date(value)
            print(json.dumps(content, indent=4, sort_keys=True, separators=(',', ':')))
        else:
            print_error('List trial failed...')
    else:
        print_error('Restful server is not running...')

def trial_kill(args):
    '''List trial'''
    nni_config = Config(get_config_filename(args))
    rest_port = nni_config.get_config('restServerPort')
    rest_pid = nni_config.get_config('restServerPid')
    if not detect_process(rest_pid):
        print_error('Experiment is not running...')
        return
    running, _ = check_rest_server_quick(rest_port)
    if running:
        response = rest_delete(trial_job_id_url(rest_port, args.trialid), 20)
        if response and check_response(response):
            print(response.text)
        else:
            print_error('Kill trial job failed...')
    else:
        print_error('Restful server is not running...')

def list_experiment(args):
    '''Get experiment information'''
    nni_config = Config(get_config_filename(args))
    rest_port = nni_config.get_config('restServerPort')
    rest_pid = nni_config.get_config('restServerPid')
    if not detect_process(rest_pid):
        print_error('Experiment is not running...')
        return
    running, _ = check_rest_server_quick(rest_port)
    if running:
        response = rest_get(experiment_url(rest_port), 20)
        if response and check_response(response):
            content = convert_time_stamp_to_date(json.loads(response.text))
            print(json.dumps(content, indent=4, sort_keys=True, separators=(',', ':')))
        else:
            print_error('List experiment failed...')
    else:
        print_error('Restful server is not running...')

def experiment_status(args):
    '''Show the status of experiment'''
    nni_config = Config(get_config_filename(args))
    rest_port = nni_config.get_config('restServerPort')
    result, response = check_rest_server_quick(rest_port)
    if not result:
        print_normal('Restful server is not running...')
    else:
        print(json.dumps(json.loads(response.text), indent=4, sort_keys=True, separators=(',', ':')))

def get_log_content(file_name, cmds):
    '''use cmds to read config content'''
    if os.path.exists(file_name):
        rest = check_output(cmds)
        print(rest.decode('utf-8'))
    else:
        print_normal('NULL!')

def log_internal(args, filetype):
    '''internal function to call get_log_content'''
    file_name = get_config_filename(args)
    if filetype == 'stdout':
        file_full_path = os.path.join(NNICTL_HOME_DIR, file_name, 'stdout')
    else:
        file_full_path = os.path.join(NNICTL_HOME_DIR, file_name, 'stderr')
    if args.head:
        get_log_content(file_full_path, ['head', '-' + str(args.head), file_full_path])
    elif args.tail:
        get_log_content(file_full_path, ['tail', '-' + str(args.tail), file_full_path])
    elif args.path:
        print_normal('The path of stdout file is: ' + file_full_path)
    else:
        get_log_content(file_full_path, ['cat', file_full_path])

def log_stdout(args):
    '''get stdout log'''
    log_internal(args, 'stdout')

def log_stderr(args):
    '''get stderr log'''
    log_internal(args, 'stderr')

def log_trial(args):
    ''''get trial log path'''
    trial_id_path_dict = {}
    nni_config = Config(get_config_filename(args))
    rest_port = nni_config.get_config('restServerPort')
    rest_pid = nni_config.get_config('restServerPid')
    if not detect_process(rest_pid):
        print_error('Experiment is not running...')
        return
    running, response = check_rest_server_quick(rest_port)
    if running:
        response = rest_get(trial_jobs_url(rest_port), 20)
        if response and check_response(response):
            content = json.loads(response.text)
            for trial in content:
                trial_id_path_dict[trial['id']] = trial['logPath']
    else:
        print_error('Restful server is not running...')
        exit(1)
    if args.id:
        if trial_id_path_dict.get(args.id):
            print('id:' + args.id + ' path:' + trial_id_path_dict[args.id])
        else:
            print_error('trial id is not valid!')
            exit(1)
    else:
        for key in trial_id_path_dict.keys():
            print('id:' + key + ' path:' + trial_id_path_dict[key])

def get_config(args):
    '''get config info'''
    nni_config = Config(get_config_filename(args))
    print(nni_config.get_all_config())

def webui_url(args):
    '''show the url of web ui'''
    nni_config = Config(get_config_filename(args))
    print_normal('{0} {1}'.format('Web UI url:', ' '.join(nni_config.get_config('webuiUrl'))))

def experiment_list(args):
    '''get the information of all experiments'''
    experiment_config = Experiments()
    experiment_dict = experiment_config.get_all_experiments()
    if not experiment_dict:
        print('There is no experiment running...')
        exit(1)
    experiment_id_list = []
    if args.all and args.all == 'all':
        for key in experiment_dict.keys():
            experiment_id_list.append(key)
    else:
        for key in experiment_dict.keys():
            if experiment_dict[key]['status'] == 'running':
                experiment_id_list.append(key)
        if not experiment_id_list:
            print_warning('There is no experiment running...\nYou can use \'nnictl experiment list all\' to list all stopped experiments!')
    experiment_information = ""
    for key in experiment_id_list:
        experiment_information += (EXPERIMENT_DETAIL_FORMAT % (key, experiment_dict[key]['status'], \
        experiment_dict[key]['startTime'], experiment_dict[key]['endTime']))
    print(EXPERIMENT_INFORMATION_FORMAT % experiment_information)
