#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Author: Volkan Şahin <volkansah.in> <bm.volkansahin@gmail.com>

import hashlib
import json
import os
import shutil
import stat
import subprocess

from base.Scope import Scope
from base.model.Policy import Policy
from base.model.Task import Task


class ExecutionManager(object):
    """docstring for FileTransferManager"""

    def __init__(self):
        super(ExecutionManager, self).__init__()

        scope = Scope.getInstance()
        self.config_manager = scope.getConfigurationManager()
        self.event_manager = scope.getEventManager()
        self.task_manager = scope.getTaskManager()
        self.messager = scope.getMessager()
        self.logger = scope.getLogger()
        self.db_service = scope.getDbService()

        # TODO move this event names to enumeration
        self.event_manager.register_event('EXECUTE_SCRIPT', self.execute_script)
        self.event_manager.register_event('REQUEST_FILE', self.request_file)
        self.event_manager.register_event('MOVE_FILE', self.move_file)
        self.event_manager.register_event('EXECUTE_TASK', self.execute_task)
        self.event_manager.register_event('POLICY', self.update_policies)

    def update_policies(self, arg):
        self.logger.debug('[ExecutionManager] Updating policies...')

        policy = Policy(json.loads(arg))
        # TODO get username
        username = 'volkan'

        ahenk_policy_ver = self.db_service.select_one_result('policy', 'version', 'type = \'A\'')
        user_policy_version = self.db_service.select_one_result('policy', 'version', 'type = \'U\' and name = \'' + username + '\'')
        installed_plugins = self.get_installed_plugins()
        missing_plugins = []

        if policy.ahenk_policy_version != ahenk_policy_ver:
            ahenk_policy_id = self.db_service.select_one_result('policy', 'id', 'type = \'A\'')
            self.db_service.delete('profile', 'id=' + str(ahenk_policy_id))
            self.db_service.update('policy', ['version'], [str(policy.ahenk_policy_version)], 'type=\'A\'')

            for profile in policy.ahenk_profiles:
                profile_columns = ['id', 'create_date', 'modify_date', 'label', 'description', 'overridable', 'active', 'deleted', 'profile_data', 'plugin']
                args = [str(ahenk_policy_id), str(profile.create_date), str(profile.modify_date), str(profile.label),
                        str(profile.description), str(profile.overridable), str(profile.active), str(profile.deleted), str(profile.profile_data), str(profile.plugin)]
                self.db_service.update('profile', profile_columns, args)
                if profile.plugin.name not in installed_plugins and profile.plugin.name not in missing_plugins:
                    missing_plugins.append(profile.plugin.name)

        else:
            self.logger.debug('[ExecutionManager] Already there is ahenk policy')

        if policy.user_policy_version != user_policy_version:
            user_policy_id = self.db_service.select_one_result('policy', 'id', 'type = \'U\' and name=\'' + username + '\'')
            self.db_service.delete('profile', 'id=' + str(user_policy_id))
            self.db_service.update('policy', ['version'], [str(policy.user_policy_version)], 'type=\'U\' and name=\'' + username + '\'')
            for profile in policy.user_profiles:
                profile_columns = ['id', 'create_date', 'modify_date', 'label', 'description', 'overridable', 'active', 'deleted', 'profile_data', 'plugin']
                args = [str(user_policy_id), str(profile.create_date), str(profile.modify_date), str(profile.label),
                        str(profile.description), str(profile.overridable), str(profile.active), str(profile.deleted), str(profile.profile_data), str(profile.plugin)]
                self.db_service.update('profile', profile_columns, args)
                if profile.plugin.name not in installed_plugins and profile.plugin.name not in missing_plugins:
                    missing_plugins.append(profile.plugin.name)
        else:
            self.logger.debug('[ExecutionManager] Already there is user policy')

        # TODO check plugins
        print("but first need these plugins:" + str(missing_plugins))

    def get_installed_plugins(self):
        plugins = self.db_service.select('plugin', ['name', 'version'])
        p_list = []
        for p in plugins:
            p_list.append(str(p[0]) + '-' + str(p[1]))
        return p_list

    def execute_task(self, arg):
        self.logger.debug('[ExecutionManager] Adding new  task...')
        task = Task(json.loads(arg))
        self.task_manager.addTask(task)
        self.logger.debug('[ExecutionManager] Task added')

    def move_file(self, arg):
        default_file_path = self.config_manager.get('CONNECTION', 'receiveFileParam')
        j = json.loads(arg)
        # msg_id =str(j['id']).lower()
        target_file_path = str(j['filePath']).lower()
        file_name = str(j['filename']).lower()
        self.logger.debug('[ExecutionManager] ' + file_name + ' will be moved to ' + target_file_path)
        shutil.move(default_file_path + file_name, target_file_path + file_name)

    def execute_script(self, arg):
        j = json.loads(arg)
        # msg_id =str(j['id']).lower()
        file_path = str(j['filePath']).lower()
        time_stamp = str(j['timestamp']).lower()
        self.logger.debug('[ExecutionManager] Making executable file (%s) for execution' % file_path)
        st = os.stat(file_path)
        os.chmod(file_path, st.st_mode | stat.S_IEXEC)
        subprocess.call("/bin/sh " + file_path, shell=True)

    # need to move somewhere else
    def request_file(self, arg):
        j = json.loads(arg)
        # msg_id =str(j['id']).lower()
        file_path = str(j['filePath']).lower()
        time_stamp = str(j['timestamp']).lower()
        self.logger.debug('[ExecutionManager] Requested file is ' + file_path)
        self.messager.send_file(file_path)

    def get_md5_file(self, fname):
        self.logger.debug('[ExecutionManager] md5 hashing')
        hash_md5 = hashlib.md5()
        with open(fname, 'rb') as f:
            for chunk in iter(lambda: f.read(4096), b""):
                hash_md5.update(chunk)
        return str(hash_md5.hexdigest())