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import acrobind
import acrort
import os
import prettytable
import register_mms
import subprocess
import shutil
import xml.etree.ElementTree as etree

Log = None

CACHED_INSTANCE_ID = None
CACHED_MACHINE_ID = None
CACHED_TARGET_DIR = None
MMS_PORT = 43234
OVERRIDE_CONFIG_FN = 'user.config'

def registry_read_string(key_name, value_name, *, open_hive=None):
    root_reg = acrort.registry.open_system_hive(hive=open_hive)
    if key_name not in root_reg.subkeys:
        acrort.common.make_logic_error("Key '{}' not found. May be agent not installed".format(key_name)).throw()
    key = root_reg.subkeys.open(key_name=key_name)
    if value_name not in key.values:
        acrort.common.make_logic_error("Value '{}' not found. May be agent not installed".format(value_name)).throw()
    value = key.values.open(value_name=value_name)
    return value.get(acrort.registry.TYPE_SZ)

def current_instance_id():
    global CACHED_INSTANCE_ID
    if CACHED_INSTANCE_ID:
        return CACHED_INSTANCE_ID
    key_short_path = "\\BackupAndRecovery\\Settings\\MachineManager\\"
    request = r'SOFTWARE\{}'.format(acrort.common.BRAND_NAME) + key_short_path
    CACHED_INSTANCE_ID = registry_read_string(request, 'InstanceID')
    return CACHED_INSTANCE_ID

def current_machine_id():
    global CACHED_MACHINE_ID
    if CACHED_MACHINE_ID:
        return CACHED_MACHINE_ID
    key_short_path = "\\BackupAndRecovery\\Settings\\MachineManager\\"
    request = r'SOFTWARE\{}'.format(acrort.common.BRAND_NAME) + key_short_path
    CACHED_MACHINE_ID = registry_read_string(request, 'MMSCurrentMachineID')
    return CACHED_MACHINE_ID

def target_dir():
    global CACHED_TARGET_DIR
    if CACHED_TARGET_DIR:
        pass
    else:
        if is_win():
            key_short_path = "\\Installer\\"
            request = r'SOFTWARE\{}'.format(acrort.common.BRAND_NAME) + key_short_path
            CACHED_TARGET_DIR = registry_read_string(request, 'TargetDir')
        else:
            CACHED_TARGET_DIR = "/usr/lib/Acronis"
    return CACHED_TARGET_DIR

def config(id, agent_dir, os_caps, is_inside_virtual, is_server_essential, port):
    return """<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<config>
    <Software>
        <Acronis>
            <BackupAndRecovery>
                <Settings>
                    <MMSHttpPort>
                        """ + str(port) + """
                    </MMSHttpPort>
                    <MmsDmlDbProtocol>
                        """ + os.path.join(agent_dir, 'DML', 'dml.db3') + """
                    </MmsDmlDbProtocol>
                    <MachineManager>
                        <InstanceID>
                            """ + current_instance_id()[0:-4] + id + """
                        </InstanceID>
                        <MMSCurrentMachineID>
                            """ + current_machine_id()[0:-4] + id + """
                        </MMSCurrentMachineID>
                    </MachineManager>
                </Settings>
            </BackupAndRecovery>
        </Acronis>
    </Software>
    <ServiceIdentifier>
        """ + id + """
    </ServiceIdentifier>
    <OSCaps>
        """ + str(os_caps) + """
    </OSCaps>
    <IsInsideVirtual>
        """ + str(is_inside_virtual) + """
    </IsInsideVirtual>
    <ServerEssentialEdition>
        """ + str(is_server_essential) + """
    </ServerEssentialEdition>
</config>
"""

def index_to_id(index):
    return str(index).zfill(4)

def is_win():
    return os.name == 'nt'

def silent_start(arguments):
    dev_null = open(os.devnull, 'wb')
    subprocess.Popen(arguments, stdout=dev_null, stderr=dev_null, shell=False)
    dev_null.close()

class Agent:
    def __init__(self, *, id, deployment_dir):
        self.id = id
        self.agent_dir = os.path.join(os.path.abspath(deployment_dir), id)
        config = etree.parse(os.path.join(self.agent_dir, OVERRIDE_CONFIG_FN))

        self._os_caps = int(config.findtext('OSCaps', '0').strip())
        self._is_inside_virtual = int(config.findtext('IsInsideVirtual', '0').strip())
        self._is_server_essential = int(config.findtext('ServerEssentialEdition', '0').strip())
        self._port = int(config.findtext('Software/Acronis/BackupAndRecovery/Settings/MMSHttpPort', str(MMS_PORT)).strip())     

    def start(self):
        Log.write('Configuration file ...', os.path.join(self.agent_dir, OVERRIDE_CONFIG_FN));
        silent_start([os.path.join(target_dir(), 'BackupAndRecovery', 'mms'), '-mode', 'console', '-homedir',  self.agent_dir])

    def register(self, destination, host, port, user, password):
        register_mms.register('onpremise' if destination == 'premise' else destination,
                              host, port, [user, password], self._port)

    def type(self):
        if self._is_inside_virtual:
            return 'virtual'
        if self._os_caps == 0:
            return 'workst'
        else:
            return 'server'


class AgentList:
    def __init__(self, deployment_dir, index_from, index_to):
        self._list = []
        self._deployment_dir = deployment_dir
        self._index_from = int(index_from) if index_from else None
        self._index_to = int(index_to) if index_to else None
        for entry in os.scandir(deployment_dir):
            if entry.is_dir() and entry.name.isdigit():
                self._list.append(Agent(id=entry.name, deployment_dir=deployment_dir))
        self._list.sort(key=lambda agent: agent.id)

    def deploy(self, workstation_count, server_count, virtual_count, server_essential_count):
        def _deploy_agent(id, dir_path, os_caps, is_inside_virtual, is_server_essential, port):
            dir_path = os.path.abspath(dir_path)
            id_path = os.path.join(dir_path, id)
            dml_path = os.path.join(id_path, 'DML')
            access_vault_dir = os.path.normpath(os.path.join(id_path, 'AccessVault/config'))

            os.mkdir(id_path)
            os.mkdir(dml_path)

            os.makedirs(access_vault_dir, exist_ok=True)           

            access_pref_file = os.path.join(access_vault_dir, 'preferred')

            source_pref_file = os.path.normpath(os.path.join(acrort.fs.APPDATA_COMMON, acrort.common.BRAND_NAME, 'BackupAndRecovery/MMS/AccessVault/config/preferred'))
            shutil.copyfile(source_pref_file, access_pref_file)

            file = open(os.path.join(id_path, OVERRIDE_CONFIG_FN), 'w')
            file.write(config(id, id_path, os_caps, is_inside_virtual, is_server_essential, port))
            file.close()

            #Log.write('Successfully deployed agent \'{}\': os_caps \'{}\', is_inside_virtual \'{}\', is_server_essential \'{}\''.format(id, os_caps, is_inside_virtual, is_server_essential))
            return Agent(id=id, deployment_dir=dir_path)

        last_id = int(max(agent.id for agent in self._list)) if self._list else 0
        first_id = int(min(agent.id for agent in self._list)) if self._list else 0
        start_index = last_id + 1

        if self._index_to:
            Log.write('In deployment command argument --to will be skipped.')
        if self._index_from:
            if self._index_from <= last_id:
                Log.write('Selected folder \'{}\' already contains agents with id range {}-{}. Specify start index more than {}'.format(self._deployment_dir, first_id, last_id, last_id))
                return
            else:
                start_index = self._index_from

        for index in range(start_index, start_index + workstation_count):
            Log.write('Deploying workstation agent \'{}\'.'.format(index))
            self._list.append(_deploy_agent(index_to_id(index), self._deployment_dir, 0, 0, 0, MMS_PORT + index))

        start_index += + workstation_count
        for index in range(start_index, start_index + server_count):
            Log.write('Deploying server agent \'{}\'.'.format(index))
            self._list.append(_deploy_agent(index_to_id(index), self._deployment_dir, 2, 0, 0, MMS_PORT + index))

        start_index += + server_count
        for index in range(start_index, start_index + virtual_count):
            Log.write('Deploying virtual agent \'{}\'.'.format(index))
            self._list.append(_deploy_agent(index_to_id(index), self._deployment_dir, 0, 1, 0, MMS_PORT + index))

        start_index += + server_essential_count
        for index in range(start_index, start_index + server_essential_count):
            Log.write('Deploying server essential agent \'{}\'.'.format(index))
            self._list.append(_deploy_agent(index_to_id(index), self._deployment_dir, 0, 0, 1, MMS_PORT + index))
		
    def _apply_range(self, func, desc):
        first_id = int(min(agent.id for agent in self._list)) if self._list else 0
        last_id = int(max(agent.id for agent in self._list)) if self._list else 0
        index_from = self._index_from or first_id
        index_to = self._index_to or last_id

        if (index_to < index_from) or not (first_id <= index_from <= last_id) or not (first_id <= index_to <= last_id):
            Log.write('Selected folder \'{}\' contains agents with id range {}-{}. Current range {}-{} is not valid.'.format(self._deployment_dir, first_id, last_id, index_from, index_to))

        start_index = max(first_id, index_from)
        last_index = min(last_id, index_to)

        for agent in self._list:
            if not (start_index <= int(agent.id) <= last_index):
                continue
            Log.write('{}: \'{}\'.'.format(desc, agent.id))
            func(agent)

    def start(self):
        def _run_agent(agent):
            agent.start()
        self._apply_range(_run_agent, 'Starting agent')

    def register(self, destination, host, port, user, password):
        def _run_agent(agent):
            agent.register(destination, host, port, user, password)
        self._apply_range(_run_agent, 'Registering agent')

    def describe(self):
        info_table = prettytable.PrettyTable(["#", "type", "homedir"])
        for agent in self._list:
            info_table.add_row([int(agent.id), agent.type(), agent.agent_dir])
        Log.write(info_table)


def main():
    parser = acrobind.CommandLineParser()
    parser.add_argument('-d', '--deploy', nargs=4, metavar=('WORKSTATIONS', 'SERVERS', 'VIRTUAL', 'ESSENTIAL'), help='Deploy several agents into specified directory.\
	    Example: acropsh -m multi_mms -d --deployment-folder C:/test -i 0 20')
    parser.add_argument('-s', '--start', action='store_true', help='start idle agents')
    parser.add_argument('-r', '--register', nargs=5, metavar=('DESTINATION(cloud/premise)', 'HOST', 'PORT', 'USER', 'PASSWORD'), help='register running agents')

    #parser.add_argument('-c', '--cleanup', action='store_true', help='cleanup agents, support interval')
    parser.add_argument('-p', '--print', action='store_true', help='print info')

    parser.add_argument('-f', '--deployment-folder', help='Deployment directory for multi-mms configurations', required=True)

    parser.add_argument('--from', help='Select agents FROM this index')
    parser.add_argument('--to', help='Select agents TO this index')
    
    parser.append_processor(acrobind.OutputArgumentsProcessor())

    config = None
    try:
        config = parser.parse_arguments()
    except acrort.Exception as exception:
        error = exception.to_error()
        ret = error.to_exit_code()
        if ret == acrort.common.EXCEPTION_AWARE_RETURN_CODE:
            error.throw()
        return ret

    global Log
    Log = acrobind.Output(config, end='\n')

    args = config['args']

    if not os.path.exists(args.deployment_folder):
        os.makedirs(args.deployment_folder)

    agents = AgentList(args.deployment_folder, vars(args)['from'], vars(args)['to'])
    if args.deploy:
        agents.deploy(int(args.deploy[0]), int(args.deploy[1]), int(args.deploy[2]), int(args.deploy[3]))
    if args.start:
        agents.start()
    if args.register:
        agents.register(args.register[0], args.register[1], args.register[2], args.register[3], args.register[4])
    if args.print:
        agents.describe()


if __name__ == '__main__':
    exit(acrobind.interruptable_safe_execute(main))