# ~*~ coding: utf-8 ~*~
from __future__ import unicode_literals

import os
import json
import logging
import traceback
import ansible.constants as default_config

from uuid import uuid4
from django.utils import timezone
from ansible.executor.task_queue_manager import TaskQueueManager
from ansible.inventory import Inventory, Host, Group
from ansible.vars import VariableManager
from ansible.parsing.dataloader import DataLoader
from ansible.executor import playbook_executor
from ansible.utils.display import Display
from ansible.playbook.play import Play
from ansible.plugins.callback import CallbackBase

from models import Tasker, AnsiblePlay, AnsibleTask, AnsibleHostResult


logger = logging.getLogger(__name__)


class AnsibleError(StandardError):
    pass


class Config(object):
    """Ansible运行时配置类, 用于初始化Ansible的一些默认配置.
    """
    def __init__(self, verbosity=None, inventory=None, listhosts=None, subset=None, module_paths=None, extra_vars=None,
                 forks=10, ask_vault_pass=False, vault_password_files=None, new_vault_password_file=None,
                 output_file=None, tags=None, skip_tags=None, one_line=None, tree=None, ask_sudo_pass=False, ask_su_pass=False,
                 sudo=None, sudo_user=None, become=None, become_method=None, become_user=None, become_ask_pass=False,
                 ask_pass=False, private_key_file=None, remote_user=None, connection="smart", timeout=10, ssh_common_args=None,
                 sftp_extra_args=None, scp_extra_args=None, ssh_extra_args=None, poll_interval=None, seconds=None, check=False,
                 syntax=None, diff=None, force_handlers=None, flush_cache=None, listtasks=None, listtags=None, module_path=None):
        self.verbosity = verbosity
        self.inventory = inventory
        self.listhosts = listhosts
        self.subset = subset
        self.module_paths = module_paths
        self.extra_vars = extra_vars
        self.forks = forks
        self.ask_vault_pass = ask_vault_pass
        self.vault_password_files = vault_password_files
        self.new_vault_password_file = new_vault_password_file
        self.output_file = output_file
        self.tags = tags
        self.skip_tags = skip_tags
        self.one_line = one_line
        self.tree = tree
        self.ask_sudo_pass = ask_sudo_pass
        self.ask_su_pass = ask_su_pass
        self.sudo = sudo
        self.sudo_user = sudo_user
        self.become = become
        self.become_method = become_method
        self.become_user = become_user
        self.become_ask_pass = become_ask_pass
        self.ask_pass = ask_pass
        self.private_key_file = private_key_file
        self.remote_user = remote_user
        self.connection = connection
        self.timeout = timeout
        self.ssh_common_args = ssh_common_args
        self.sftp_extra_args = sftp_extra_args
        self.scp_extra_args = scp_extra_args
        self.ssh_extra_args = ssh_extra_args
        self.poll_interval = poll_interval
        self.seconds = seconds
        self.check = check
        self.syntax = syntax
        self.diff = diff
        self.force_handlers = force_handlers
        self.flush_cache = flush_cache
        self.listtasks = listtasks
        self.listtags = listtags
        self.module_path = module_path
        self.__overwrite_default()

    def __overwrite_default(self):
        """上面并不能包含Ansible所有的配置, 如果有其他的配置,
        可以通过替换default_config模块里面的变量进行重载，　
        比如 default_config.DEFAULT_ASK_PASS = False.
        """
        default_config.HOST_KEY_CHECKING = False


class InventoryMixin(object):
    """提供生成Ansible inventory对象的方法
    """

    def gen_inventory(self):
        """用于生成动态构建Ansible Inventory.
        self.hosts: [
                        {"host": <ip>,
                          "port": <port>,
                          "user": <user>,
                          "pass": <pass>,
                          "key": <sshKey>,
                          "group": <default>
                          "other_host_var": <other>},
                        {...},
                     ]
        self.group_vars: {
            "groupName1": {"var1": <value>, "var2": <value>, ...},
            "groupName2": {"var1": <value>, "var2": <value>, ...},
        }

        :return: 返回一个Ansible的inventory对象
        """

        # TODO: 验证输入

        # 创建Ansible Group,如果没有则创建default组
        for asset in self.hosts:
            g_name = asset.get('group', 'default')
            if g_name not in [g.name for g in self.groups]:
                group = Group(name=g_name)
                self.groups.append(group)

        # 添加组变量到相应的组上
        for group_name, variables in self.group_vars.iteritems():
            for g in self.groups:
                if g.name == group_name:
                    for v_name, v_value in variables.iteritems():
                        g.set_variable(v_name, v_value)

        # 往组里面添加Host
        for asset in self.hosts:
            # 添加Host链接的常用变量(host,port,user,pass,key)
            host = Host(name=asset['name'], port=asset['port'])
            host.set_variable('ansible_host', asset['ip'])
            host.set_variable('ansible_port', asset['port'])
            host.set_variable('ansible_user', asset['username'])

            # 添加密码和秘钥
            if asset.get('password'):
                host.set_variable('ansible_ssh_pass', asset['password'])
            if asset.get('key'):
                host.set_variable('ansible_ssh_private_key_file', asset['key'])

            # 添加become支持
            become = asset.get("become", None)
            if become is not None:
                host.set_variable("ansible_become", True)
                host.set_variable("ansible_become_method", become.get('method'))
                host.set_variable("ansible_become_user", become.get('user'))
                host.set_variable("ansible_become_pass", become.get('pass'))
            else:
                host.set_variable("ansible_become", False)

            # 添加其他Host的额外变量
            for key, value in asset.iteritems():
                if key not in ["name", "port", "ip", "username", "password", "key"]:
                    host.set_variable(key, value)

            # 将host添加到组里面
            for g in self.groups:
                if g.name == asset.get('group', 'default'):
                    g.add_host(host)

        # 将组添加到Inventory里面，生成真正的inventory对象
        inventory = Inventory(loader=self.loader, variable_manager=self.variable_manager, host_list=[])
        for g in self.groups:
            inventory.add_group(g)
        self.variable_manager.set_inventory(inventory)
        return inventory


class CallbackModule(CallbackBase):
    """处理和分析Ansible运行结果,并保存数据.
    """
    CALLBACK_VERSION = 2.0
    CALLBACK_TYPE = 'stdout'
    CALLBACK_NAME = 'json'

    def __init__(self, tasker_id, display=None):
        super(CallbackModule, self).__init__(display)
        self.results = []
        self.output = {}
        self.tasker_id = tasker_id

    def _new_play(self, play):
        """将Play保持到数据里面
        """
        ret = {
            'tasker': self.tasker_id,
            'name': play.name,
            'uuid': str(play._uuid),
            'tasks': []
        }

        try:
            tasker = Tasker.objects.get(uuid=self.tasker_id)
            play = AnsiblePlay(tasker, name=ret['name'], uuid=ret['uuid'])
            play.save()
        except Exception as e:
            traceback.print_exc()
            logger.error("Save ansible play uuid to database error!, %s" % e.message)

        return ret

    def _new_task(self, task):
        """将Task保持到数据库里,需要和Play进行关联
        """
        ret = {
            'name': task.name,
            'uuid': str(task._uuid),
            'failed': {},
            'unreachable': {},
            'skipped': {},
            'no_hosts': {},
            'success': {}
        }

        try:
            play = AnsiblePlay.objects.get(uuid=self.__play_uuid)
            task = AnsibleTask(play=play, uuid=ret['uuid'], name=ret['name'])
            task.save()
        except Exception as e:
            logger.error("Save ansible task uuid to database error!, %s" % e.message)

        return ret

    @property
    def __task_uuid(self):
        return self.results[-1]['tasks'][-1]['uuid']

    @property
    def __play_uuid(self):
        return self.results[-1]['uuid']

    def save_task_result(self, result, status):
        try:
            task = AnsibleTask.objects.get(uuid=self.__task_uuid)
            host_result = AnsibleHostResult(task=task, name=result._host)
            if status == "failed":
                host_result.failed = json.dumps(result._result)
            elif status == "unreachable":
                host_result.unreachable = json.dumps(result._result)
            elif status == "skipped":
                host_result.skipped = json.dumps(result._result)
            elif status == "success":
                host_result.success = json.dumps(result._result)
            else:
                logger.error("No such status(failed|unreachable|skipped|success), please check!")
            host_result.save()
        except Exception as e:
            logger.error("Save Ansible host result to database error!, %s" % e.message)

    @staticmethod
    def save_no_host_result(task):
        try:
            task = AnsibleTask.objects.get(uuid=task._uuid)
            host_result = AnsibleHostResult(task=task, no_host="no host to run this task")
            host_result.save()
        except Exception as e:
            logger.error("Save Ansible host result to database error!, %s" % e.message)

    def v2_runner_on_failed(self, result, ignore_errors=False):
        self.save_task_result(result, "failed")
        host = result._host
        self.results[-1]['tasks'][-1]['failed'][host.name] = result._result

    def v2_runner_on_unreachable(self, result):
        self.save_task_result(result, "unreachable")
        host = result._host
        self.results[-1]['tasks'][-1]['unreachable'][host.name] = result._result

    def v2_runner_on_skipped(self, result):
        self.save_task_result(result, "skipped")
        host = result._host
        self.results[-1]['tasks'][-1]['skipped'][host.name] = result._result

    def v2_runner_on_no_hosts(self, task):
        self.save_no_host_result(task)
        self.results[-1]['tasks'][-1]['no_hosts']['msg'] = "no host to run this task"

    def v2_runner_on_ok(self, result):
        self.save_task_result(result, "success")
        host = result._host
        self.results[-1]['tasks'][-1]['success'][host.name] = result._result

    def v2_playbook_on_play_start(self, play):
        self.results.append(self._new_play(play))

    def v2_playbook_on_task_start(self, task, is_conditional):
        self.results[-1]['tasks'].append(self._new_task(task))

    def v2_playbook_on_stats(self, stats):
        """AdHoc模式下这个钩子不会执行
        """
        hosts = sorted(stats.processed.keys())

        summary = {}
        for h in hosts:
            s = stats.summarize(h)
            summary[h] = s

        self.output['plays'] = self.results
        self.output['stats'] = summary
        print "summary: %s" % summary


class PlayBookRunner(InventoryMixin):
    """用于执行AnsiblePlaybook的接口.简化Playbook对象的使用.
    """

    def __init__(self, config, palybook_path, playbook_var, become_pass, *hosts, **group_vars):
        """

        :param config: Config实例
        :param palybook_path: playbook的路径
        :param playbook_var: 执行Playbook时的变量
        :param become_pass: sudo passsword
        :param hosts: 可变位置参数, 为一个资产列表, 每一个资产用dict表示, 以下是这个dict必须包含的key
            [{
                        "name": "asset_name",
                        "ip": "asset_ip",
                        "port": "asset_port",
                        "username": "asset_user",
                        "password": "asset_pass",
                        "key": "asset_private_key",
                        "group": "asset_group_name",
                        ...
            }]
        :param group_vars: 可变关键字参数, 是资产组变量, 记录对应的资产组变量
                "groupName1": {"group_variable1": "value1",...}
                "groupName2": {"group_variable1": "value1",...}
        """

        self.options = config

        # 设置verbosity级别, 及命令行的--verbose选项
        self.display = Display()
        self.display.verbosity = self.options.verbosity
        playbook_executor.verbosity = self.options.verbosity

        # sudo成其他用户的配置
        self.options.become = True
        self.options.become_method = 'sudo'
        self.options.become_user = 'root'
        passwords = {'become_pass': become_pass}

        # 传入playbook的路径，以及执行需要的变量
        pb_dir = os.path.dirname(__file__)
        playbook = "%s/%s" % (pb_dir, palybook_path)

        # 生成Ansible inventory, 这些变量Mixin都会用到
        self.hosts = hosts
        self.group_vars = group_vars
        self.loader = DataLoader()
        self.variable_manager = VariableManager()
        self.groups = []
        self.variable_manager.extra_vars = playbook_var
        self.inventory = self.gen_inventory()

        # 初始化playbook的executor
        self.pbex = playbook_executor.PlaybookExecutor(
            playbooks=[playbook],
            inventory=self.inventory,
            variable_manager=self.variable_manager,
            loader=self.loader,
            options=self.options,
            passwords=passwords)

    def run(self):
        """执行Playbook, 记录执行日志, 处理执行结果.
        :return: <AnsibleResult>对象
        """
        self.pbex.run()
        stats = self.pbex._tqm._stats

        # 测试执行是否成功
        run_success = True
        hosts = sorted(stats.processed.keys())
        for h in hosts:
            t = stats.summarize(h)
            if t['unreachable'] > 0 or t['failures'] > 0:
                run_success = False

        # TODO: 记录执行日志, 处理执行结果.

        return stats


class ADHocRunner(InventoryMixin):
    """ADHoc接口
    """
    def __init__(self, config, play_data, *hosts, **group_vars):
        """
        :param hosts: 见PlaybookRunner参数
        :param group_vars: 见PlaybookRunner参数
        :param config: Config实例

        :param play_data:
        play_data = dict(
            name="Ansible Ad-Hoc",
            hosts=pattern,
            gather_facts=True,
            tasks=[dict(action=dict(module='service', args={'name': 'vsftpd', 'state': 'restarted'}), async=async, poll=poll)]
        )
        """

        self.options = config

        # 设置verbosity级别, 及命令行的--verbose选项
        self.display = Display()
        self.display.verbosity = self.options.verbosity

        # sudo的配置移到了Host级别去了，因此这里不再需要处理
        self.passwords = None

        # 生成Ansible inventory, 这些变量Mixin都会用到
        self.hosts = hosts
        self.group_vars = group_vars
        self.loader = DataLoader()
        self.variable_manager = VariableManager()
        self.groups = []
        self.inventory = self.gen_inventory()

        self.play = Play().load(play_data, variable_manager=self.variable_manager, loader=self.loader)

    @staticmethod
    def update_db_tasker(tasker_id, ext_code):
        try:
            tasker = Tasker.objects.get(uuid=tasker_id)
            tasker.end = timezone.now()
            tasker.completed = True
            tasker.exit_code = ext_code
            tasker.save()
        except Exception as e:
            logger.error("Update Tasker Status into database error!, %s" % e.message)

    def create_db_tasker(self, name, uuid):
        try:
            hosts = [host.get('name') for host in self.hosts]
            tasker = Tasker(name=name, uuid=uuid, hosts=','.join(hosts), start=timezone.now())
            tasker.save()
        except Exception as e:
            logger.error("Save Tasker to database error!, %s" % e.message)

    def run(self, tasker_name, tasker_uuid):
        """执行ADHoc, 执行完后, 修改AnsiblePlay的状态为完成状态.

        :param tasker_uuid <str> 用于标示此次task
        """
        # 初始化callback插件,以及Tasker

        self.create_db_tasker(tasker_name, tasker_uuid)
        self.results_callback = CallbackModule(tasker_uuid)

        tqm = None
        # TODO:日志和结果分析
        try:
            tqm = TaskQueueManager(
                inventory=self.inventory,
                variable_manager=self.variable_manager,
                loader=self.loader,
                stdout_callback=self.results_callback,
                options=self.options,
                passwords=self.passwords
            )
            ext_code = tqm.run(self.play)
            result = self.results_callback.results

            # 任务运行结束, 标示任务完成
            self.update_db_tasker(tasker_uuid, ext_code)

            ret = json.dumps(result)
            return ext_code, ret

        finally:
            if tqm:
                tqm.cleanup()


def test_run():
    conf = Config()
    assets = [
        {
                "name": "192.168.1.119",
                "ip": "192.168.1.119",
                "port": "22",
                "username": "root",
                "password": "tongfang_test",
                "key": "asset_private_key",
        },
        {
                "name": "192.168.232.135",
                "ip": "192.168.232.135",
                "port": "22",
                "username": "yumaojun",
                "password": "xxx",
                "key": "asset_private_key",
                "become": {"method": "sudo", "user": "root", "pass": "xxx"}
    },
    ]
    # 初始化Play
    play_source = {
            "name": "Ansible Play",
            "hosts": "default",
            "gather_facts": "no",
            "tasks": [
                dict(action=dict(module='ping')),
            ]
        }
    hoc = ADHocRunner(conf, play_source, *assets)
    uuid = "tasker-" + uuid4().hex
    ext_code, result = hoc.run("test_task", uuid)
    print ext_code
    print result


if __name__ == "__main__":
    test_run()
