# from __future__ import absolute_import, unicode_literals
import contextlib
import os
import sys
import traceback
import logging
from celery import Celery


# set the default Django settings module for the 'celery' program.
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'settings.dev')
import django
django.setup()

app = Celery('loonflow')
# Using a string here means the worker doesn't have to serialize
# the configuration object to child processes.
# - namespace='CELERY' means all celery-related configuration keys
#   should have a `CELERY_` prefix.
app.config_from_object('django.conf:settings', namespace='CELERY')

# Load task modules from all registered Django app configs.
app.autodiscover_tasks()


from apps.ticket.models import TicketRecord
from apps.workflow.models import Transition, State, WorkflowScript, Workflow, CustomNotice
from service.account.account_base_service import AccountBaseService
from service.common.constant_service import CONSTANT_SERVICE
from service.ticket.ticket_base_service import TicketBaseService
from django.conf import settings

try:
    from StringIO import StringIO
except ImportError:
    from io import StringIO

logger = logging.getLogger('django')



@app.task(bind=True)
def debug_task(self):
    print('Request: {0!r}'.format(self.request))

@app.task
def test_task(a, b):
    print('a:', a)
    print('b:', b)
    print(a+b)


@contextlib.contextmanager
def stdoutIO(stdout=None):
    old = sys.stdout
    if stdout is None:
        try:
            # for python2
            stdout = StringIO.StringIO()
        except Exception:
            stdout = StringIO()
    sys.stdout = stdout
    yield stdout
    sys.stdout = old


@app.task
def run_flow_task(ticket_id, script_id_str, state_id, action_from='loonrobot'):
    """
    执行工作流脚本
    :param script_id_star:通过脚本id来执行, 保存的是字符串
    :param ticket_id:
    :param state_id:
    :param action_from:
    :return:
    """
    script_id = int(script_id_str)
    ticket_obj = TicketRecord.objects.filter(id=ticket_id, is_deleted=False).first()
    if ticket_obj.participant == script_id_str and ticket_obj.participant_type_id == CONSTANT_SERVICE.PARTICIPANT_TYPE_ROBOT:
        ## 校验脚本是否合法
        # 获取脚本名称
        script_obj = WorkflowScript.objects.filter(id=script_id, is_deleted=False, is_active=True).first()
        if not script_obj:
            return False, '脚本未注册或非激活状态'

        script_file = os.path.join(settings.MEDIA_ROOT, script_obj.saved_name.name)
        globals = {'ticket_id': ticket_id, 'action_from': action_from}
        # 如果需要脚本执行完成后，工单不往下流转(也就脚本执行失败或调用其他接口失败的情况)，需要在脚本中抛出异常
        try:
            with stdoutIO() as s:
                # execfile(script_file, globals)  # for python 2
                exec(open(script_file, encoding='utf-8').read(), globals)
            script_result = True
            # script_result_msg = ''.join(s.buflist)
            script_result_msg = ''.join(s.getvalue())
        except Exception as e:
            logger.error(traceback.format_exc())
            script_result = False
            script_result_msg = e.__str__()

        logger.info('*' * 20 + '工作流脚本回调,ticket_id:[%s]' % ticket_id + '*' * 20)
        logger.info('*******工作流脚本回调，ticket_id:{}*****'.format(ticket_id))

        # 因为上面的脚本执行时间可能会比较长，为了避免db session失效，重新获取ticket对象
        ticket_obj = TicketRecord.objects.filter(id=ticket_id, is_deleted=False).first()
        # 新增处理记录,脚本后只允许只有一个后续直连状态
        transition_obj = Transition.objects.filter(source_state_id=state_id, is_deleted=False).first()

        new_ticket_flow_dict = dict(ticket_id=ticket_id, transition_id=transition_obj.id,
                                    suggestion=script_result_msg, participant_type_id=CONSTANT_SERVICE.PARTICIPANT_TYPE_ROBOT,
                                    participant='脚本:(id:{}, name:{})'.format(script_obj.id, script_obj.name), state_id=state_id, creator='loonrobot')

        TicketBaseService.add_ticket_flow_log(new_ticket_flow_dict)
        if not script_result:
            # 脚本执行失败，状态不更新,标记任务执行结果
            ticket_obj.script_run_last_result = False
            ticket_obj.save()
            return False, script_result_msg
        # 自动执行流转
        flag, msg = TicketBaseService.handle_ticket(ticket_id, dict(username='loonrobot',
                                                                    suggestion='脚本执行完成后自行流转',
                                                                    transition_id=transition_obj.id), False, True)
        if flag:
            logger.info('******脚本执行成功,工单基础信息更新完成, ticket_id:{}******'.format(ticket_id))
        return flag, msg
    else:
        return False, '工单当前处理人为非脚本，不执行脚本'


@app.task
def timer_transition(ticket_id, state_id, date_time, transition_id):
    """
    定时器流转
    :param ticket_id:
    :param state_id:
    :param date_time:
    :param transition_id:
    :return:
    """
    # 需要满足工单此状态后续无其他操作才自动流转
    # 查询该工单此状态所有操作
    flow_log_set, msg = TicketBaseService().get_ticket_flow_log(ticket_id, 'loonrobot', per_page=1000)
    for flow_log in flow_log_set:
        if flow_log.get('state').get('state_id') == state_id and flow_log.get('gmt_created') > date_time:
            return True, '后续有操作，定时器失效'
    # 执行流转
    handle_ticket_data = dict(transition_id=transition_id, username='loonrobot', suggestion='定时器流转')
    TicketBaseService().handle_ticket(ticket_id, handle_ticket_data, True)


@app.task
def send_ticket_notice(ticket_id):
    """
    发送工单通知
    :param ticket_id:
    :return:
    """
    # 获取工单信息
    # 获取工作流信息，获取工作流的通知信息
    # 获取通知信息的标题和内容模板
    # 将通知内容，通知标题，通知人，作为变量传给通知脚本
    ticket_obj = TicketRecord.objects.filter(id=ticket_id, is_deleted=0).first()
    if not ticket_obj:
        return False, 'ticket is not exist or has been deleted'

    workflow_id = ticket_obj.workflow_id
    workflow_obj = Workflow.objects.filter(id=workflow_id, is_deleted=0).first()
    notices = workflow_obj.notices
    if not notices:
        return True, 'no notice defined'
    notice_str_list = notices.split(',')
    notice_id_list = [int(notice_str) for notice_str in notice_str_list]
    for notice_id in notice_id_list:
        notice_obj = CustomNotice.objects.filter(id=notice_id, is_deleted=0).first()
        if not notice_obj:
            continue
        title_template = notice_obj.title_template
        content_template = notice_obj.content_template
        # 获取工单所有字段的变量
        ticket_value_info, msg = TicketBaseService.get_ticket_all_field_value(ticket_id)
        if not ticket_value_info:
            return False, msg
        title_result = title_template.format(**ticket_value_info)
        content_result = content_template.format(**ticket_value_info)
        notice_script_file_name = notice_obj.script.name
        notice_script_file = os.path.join(settings.MEDIA_ROOT, notice_script_file_name)
        # 获取工单最后一条操作记录
        flow_log_list, msg = TicketBaseService.get_ticket_flow_log(ticket_id, 'loonrobot')
        last_flow_log = flow_log_list[0]
        participant_info_list = []
        participant_username_list = []
        from apps.account.models import LoonUser
        if ticket_obj.participant_type_id == CONSTANT_SERVICE.PARTICIPANT_TYPE_PERSONAL:
            participant_username_list = [ticket_obj.participant]
        elif ticket_obj.participant_type_id in (CONSTANT_SERVICE.PARTICIPANT_TYPE_MULTI, CONSTANT_SERVICE.PARTICIPANT_TYPE_MULTI_ALL):
            participant_username_list = ticket_obj.participant.split(',')
        elif ticket_obj.participant_type_id == CONSTANT_SERVICE.PARTICIPANT_TYPE_ROLE:
            participant_username_list, msg = AccountBaseService.get_role_username_list(ticket_obj.participant)
        elif ticket_obj.participant_type_id == CONSTANT_SERVICE.PARTICIPANT_TYPE_DEPT:
            participant_username_list, msg = AccountBaseService.get_dept_username_list(ticket_obj.participant)
        if participant_username_list:
            participant_queryset = LoonUser.objects.filter(username__in=participant_username_list, is_deleted=0)
            for participant_0 in participant_queryset:
                participant_info_list.append(dict(username=participant_0.username, alias=participant_0.alias,
                                                  phone=participant_0.phone, email=participant_0.email))

        globals = {'title_result': title_result, 'content_result': content_result,
                   'participant': ticket_obj.participant, 'participant_type_id': ticket_obj.participant_type_id,
                   'multi_all_person': ticket_obj.multi_all_person, 'ticket_value_info': ticket_value_info,
                   'last_flow_log': last_flow_log, 'participant_info_list': participant_info_list}
        try:
            with stdoutIO() as s:
                # execfile(script_file, globals)  # for python 2
                exec(open(notice_script_file, encoding='utf-8').read(), globals)
            script_result = True
            # script_result_msg = ''.join(s.buflist)
            script_result_msg = ''.join(s.getvalue())
            logger.info('send notice successful for ticket_id: {}, notice_id:{}'.format(ticket_id, notice_id))
        except Exception as e:
            logger.error(traceback.format_exc())
            script_result = False
            script_result_msg = e.__str__()
        return script_result, script_result_msg