import logging
import time
import random

from django.template import TemplateDoesNotExist
from django.template.loader import select_template
from django.conf import settings

import otree.common
import otree.constants
from otree.channels.utils import auto_advance_group
from otree.common import (
    random_chars_8,
    random_chars_10,
    get_admin_secret_code,
    get_app_label_from_name,
)
from otree.db import models
from otree.models_concrete import RoomToSession
from otree.db import idmap
from otree.db.idmap import SessionIDMapMixin

logger = logging.getLogger('otree')


ADMIN_SECRET_CODE = get_admin_secret_code()


class Session(models.OTreeModel, models.VarsMixin, SessionIDMapMixin):
    class Meta:
        app_label = "otree"
        # if i don't set this, it could be in an unpredictable order
        ordering = ['pk']

    vars: dict = models._PickleField(default=dict)
    config: dict = models._PickleField(default=dict, null=True)

    # label of this session instance
    label = models.CharField(
        max_length=300, null=True, blank=True, help_text='For internal record-keeping'
    )

    code = models.CharField(
        default=random_chars_8,
        max_length=16,
        null=False,
        unique=True,
        doc="Randomly generated unique identifier for the session.",
    )

    mturk_HITId = models.CharField(
        max_length=300,
        null=True,
        blank=True,
        help_text='Hit id for this session on MTurk',
    )
    mturk_HITGroupId = models.CharField(
        max_length=300,
        null=True,
        blank=True,
        help_text='Hit id for this session on MTurk',
    )
    is_mturk = models.BooleanField(default=False)

    def mturk_num_workers(self):
        assert self.is_mturk
        return int(self.num_participants / settings.MTURK_NUM_PARTICIPANTS_MULTIPLE)

    mturk_use_sandbox = models.BooleanField(
        default=True, help_text="Should this session be created in mturk sandbox?"
    )

    # use Float instead of DateTime because DateTime
    # is a pain to work with (e.g. naive vs aware datetime objects)
    # and there is no need here for DateTime
    mturk_expiration = models.FloatField(null=True)
    mturk_qual_id = models.CharField(default='', max_length=50)

    archived = models.BooleanField(
        default=False,
        db_index=True,
        doc=(
            "If set to True the session won't be visible on the "
            "main ViewList for sessions"
        ),
    )

    comment = models.TextField(blank=True)

    _anonymous_code = models.CharField(
        default=random_chars_10, max_length=10, null=False, db_index=True
    )

    is_demo = models.BooleanField(default=False)

    _admin_report_app_names = models.TextField(default='')
    _admin_report_num_rounds = models.CharField(default='', max_length=255)

    num_participants = models.PositiveIntegerField()

    def __unicode__(self):
        return self.code

    @property
    def participation_fee(self):
        '''This method is deprecated from public API,
        but still useful internally (like data export)'''
        return self.config['participation_fee']

    @property
    def real_world_currency_per_point(self):
        '''This method is deprecated from public API,
        but still useful internally (like data export)'''
        return self.config['real_world_currency_per_point']

    @property
    def use_browser_bots(self):
        return self.config.get('use_browser_bots', False)

    def mock_exogenous_data(self):
        '''
        It's for any exogenous data:
        - participant labels (which are not passed in through REST API)
        - participant vars
        - session vars (if we enable that)
        '''
        if self.config.get('mock_exogenous_data'):
            import shared_out as user_utils

            with idmap.use_cache():
                user_utils.mock_exogenous_data(self)

                # need to save self because it's not in the idmap cache
                self.save()

    def get_subsessions(self):
        lst = []
        app_sequence = self.config['app_sequence']
        for app in app_sequence:
            models_module = otree.common.get_models_module(app)
            subsessions = models_module.Subsession.objects.filter(
                session=self
            ).order_by('round_number')
            lst.extend(list(subsessions))
        return lst

    def get_participants(self):
        return list(self.participant_set.order_by('id_in_session'))

    def mturk_worker_url(self):
        # different HITs
        # get the same preview page, because they are lumped into the same
        # "hit group". This is not documented, but it seems HITs are lumped
        # if a certain subset of properties are the same:
        # https://forums.aws.amazon.com/message.jspa?messageID=597622#597622
        # this seems like the correct design; the only case where this will
        # not work is if the HIT was deleted from the server, but in that case,
        # the HIT itself should be canceled.

        # 2018-06-04:
        # the format seems to have changed to this:
        # https://worker.mturk.com/projects/{group_id}/tasks?ref=w_pl_prvw
        # but the old format still works.
        # it seems I can't replace groupId by hitID, which i would like to do
        # because it's more precise.
        subdomain = "workersandbox" if self.mturk_use_sandbox else 'www'
        return "https://{}.mturk.com/mturk/preview?groupId={}".format(
            subdomain, self.mturk_HITGroupId
        )

    def mturk_is_expired(self):
        # self.mturk_expiration is offset-aware, so therefore we must compare
        # it against an offset-aware value.
        return self.mturk_expiration and self.mturk_expiration < time.time()

    def mturk_is_active(self):

        return self.mturk_HITId and not self.mturk_is_expired()

    def advance_last_place_participants(self):
        # django.test takes 0.5 sec to import,
        # if this is done globally then it adds to each startup
        # it's only used here, and often isn't used at all.
        # so best to do it only here
        # it gets cached
        import django.test

        client = django.test.Client()

        participants = self.get_participants()

        # in case some participants haven't started
        unvisited_participants = []
        for p in participants:
            if p._index_in_pages == 0:
                unvisited_participants.append(p)
                client.get(p._start_url(), follow=True)

        if unvisited_participants:
            # that's it -- just visit the start URL, advancing by 1
            return

        last_place_page_index = min([p._index_in_pages for p in participants])
        last_place_participants = [
            p for p in participants if p._index_in_pages == last_place_page_index
        ]

        for p in last_place_participants:
            try:
                current_form_page_url = p._current_form_page_url
                if current_form_page_url:
                    resp = client.post(
                        current_form_page_url,
                        data={
                            otree.constants.timeout_happened: True,
                            otree.constants.admin_secret_code: ADMIN_SECRET_CODE,
                        },
                        follow=True,
                    )
                    # not sure why, but many users are getting HttpResponseNotFound
                    if resp.status_code >= 400:
                        msg = (
                            'Submitting page {} failed, '
                            'returned HTTP status code {}.'.format(
                                current_form_page_url, resp.status_code
                            )
                        )
                        content = resp.content
                        if len(content) < 600:
                            msg += ' response content: {}'.format(content)
                        raise AssertionError(msg)

                else:
                    # it's possible that the slowest user is on a wait page,
                    # especially if their browser is closed.
                    # because they were waiting for another user who then
                    # advanced past the wait page, but they were never
                    # advanced themselves.
                    start_url = p._start_url()
                    resp = client.get(start_url, follow=True)
            except:
                logging.exception("Failed to advance participants.")
                raise

            # do the auto-advancing here,
            # rather than in increment_index_in_pages,
            # because it's only needed here.
            otree.channels.utils.sync_group_send_wrapper(
                type='auto_advanced', group=auto_advance_group(p.code), event={}
            )

    def get_room(self):
        from otree.room import ROOM_DICT

        try:
            room_name = RoomToSession.objects.get(session=self).room_name
            return ROOM_DICT[room_name]
        except RoomToSession.DoesNotExist:
            return None

    def _get_payoff_plus_participation_fee(self, payoff):
        '''For a participant who has the given payoff,
        return their payoff_plus_participation_fee
        Useful to define it here, for data export
        '''

        return self.config['participation_fee'] + payoff.to_real_world_currency(self)

    def _set_admin_report_app_names(self):

        admin_report_app_names = []
        num_rounds_list = []
        for app_name in self.config['app_sequence']:
            models_module = otree.common.get_models_module(app_name)
            app_label = get_app_label_from_name(app_name)
            try:
                select_template(
                    [f'{app_label}/admin_report.html', f'{app_label}/AdminReport.html']
                )
            except TemplateDoesNotExist:
                pass
            else:
                admin_report_app_names.append(app_name)
                num_rounds_list.append(models_module.Constants.num_rounds)

        self._admin_report_app_names = ';'.join(admin_report_app_names)
        self._admin_report_num_rounds = ';'.join(str(n) for n in num_rounds_list)

    def _admin_report_apps(self):
        return self._admin_report_app_names.split(';')

    def _admin_report_num_rounds_list(self):
        return [int(num) for num in self._admin_report_num_rounds.split(';')]

    def has_admin_report(self):
        return bool(self._admin_report_app_names)