from collections import defaultdict
from datetime import datetime
import json
import logging

import pytz
from django.contrib.auth.models import User
from django.core.urlresolvers import reverse
from django.db import connection
from django.http import HttpResponse
from django.utils.timezone import UTC
import pystache_custom as pystache
from opaque_keys.edx.locations import i4xEncoder
from opaque_keys.edx.keys import CourseKey
from xmodule.modulestore.django import modulestore

from django_comment_common.models import Role, FORUM_ROLE_STUDENT
from django_comment_client.permissions import check_permissions_by_view, has_permission
from edxmako import lookup_template

from courseware.access import has_access
from openedx.core.djangoapps.course_groups.cohorts import (
    get_course_cohort_settings, get_cohort_by_id, get_cohort_id, is_commentable_cohorted, is_course_cohorted
)
from openedx.core.djangoapps.course_groups.models import CourseUserGroup


log = logging.getLogger(__name__)


def extract(dic, keys):
    return {k: dic.get(k) for k in keys}


def strip_none(dic):
    return dict([(k, v) for k, v in dic.iteritems() if v is not None])


def strip_blank(dic):
    def _is_blank(v):
        return isinstance(v, str) and len(v.strip()) == 0
    return dict([(k, v) for k, v in dic.iteritems() if not _is_blank(v)])

# TODO should we be checking if d1 and d2 have the same keys with different values?


def merge_dict(dic1, dic2):
    return dict(dic1.items() + dic2.items())


def get_role_ids(course_id):
    roles = Role.objects.filter(course_id=course_id).exclude(name=FORUM_ROLE_STUDENT)
    return dict([(role.name, list(role.users.values_list('id', flat=True))) for role in roles])


def has_forum_access(uname, course_id, rolename):
    try:
        role = Role.objects.get(name=rolename, course_id=course_id)
    except Role.DoesNotExist:
        return False
    return role.users.filter(username=uname).exists()


def get_accessible_discussion_modules(course, user, include_all=False):  # pylint: disable=invalid-name
    """
    Return a list of all valid discussion modules in this course that
    are accessible to the given user.
    """
    all_modules = modulestore().get_items(course.id, qualifiers={'category': 'discussion'})

    def has_required_keys(module):
        for key in ('discussion_id', 'discussion_category', 'discussion_target'):
            if getattr(module, key, None) is None:
                log.warning("Required key '%s' not in discussion %s, leaving out of category map" % (key, module.location))
                return False
        return True

    return [
        module for module in all_modules
        if has_required_keys(module) and (include_all or has_access(user, 'load', module, course.id))
    ]


def get_discussion_id_map(course, user):
    """
    Transform the list of this course's discussion modules (visible to a given user) into a dictionary of metadata keyed
    by discussion_id.
    """
    def get_entry(module):  # pylint: disable=missing-docstring
        discussion_id = module.discussion_id
        title = module.discussion_target
        last_category = module.discussion_category.split("/")[-1].strip()
        return (discussion_id, {"location": module.location, "title": last_category + " / " + title})

    return dict(map(get_entry, get_accessible_discussion_modules(course, user)))


def _filter_unstarted_categories(category_map):

    now = datetime.now(UTC())

    result_map = {}

    unfiltered_queue = [category_map]
    filtered_queue = [result_map]

    while unfiltered_queue:

        unfiltered_map = unfiltered_queue.pop()
        filtered_map = filtered_queue.pop()

        filtered_map["children"] = []
        filtered_map["entries"] = {}
        filtered_map["subcategories"] = {}

        for child in unfiltered_map["children"]:
            if child in unfiltered_map["entries"]:
                if unfiltered_map["entries"][child]["start_date"] <= now:
                    filtered_map["children"].append(child)
                    filtered_map["entries"][child] = {}
                    for key in unfiltered_map["entries"][child]:
                        if key != "start_date":
                            filtered_map["entries"][child][key] = unfiltered_map["entries"][child][key]
                else:
                    log.debug(u"Filtering out:%s with start_date: %s", child, unfiltered_map["entries"][child]["start_date"])
            else:
                if unfiltered_map["subcategories"][child]["start_date"] < now:
                    filtered_map["children"].append(child)
                    filtered_map["subcategories"][child] = {}
                    unfiltered_queue.append(unfiltered_map["subcategories"][child])
                    filtered_queue.append(filtered_map["subcategories"][child])

    return result_map


def _sort_map_entries(category_map, sort_alpha):
    things = []
    for title, entry in category_map["entries"].items():
        if entry["sort_key"] is None and sort_alpha:
            entry["sort_key"] = title
        things.append((title, entry))
    for title, category in category_map["subcategories"].items():
        things.append((title, category))
        _sort_map_entries(category_map["subcategories"][title], sort_alpha)
    category_map["children"] = [x[0] for x in sorted(things, key=lambda x: x[1]["sort_key"])]


def get_discussion_category_map(course, user, cohorted_if_in_list=False, exclude_unstarted=True):
    """
    Transform the list of this course's discussion modules into a recursive dictionary structure.  This is used
    to render the discussion category map in the discussion tab sidebar for a given user.

    Args:
        course: Course for which to get the ids.
        user:  User to check for access.
        cohorted_if_in_list (bool): If True, inline topics are marked is_cohorted only if they are
            in course_cohort_settings.discussion_topics.

    Example:
        >>> example = {
        >>>               "entries": {
        >>>                   "General": {
        >>>                       "sort_key": "General",
        >>>                       "is_cohorted": True,
        >>>                       "id": "i4x-edx-eiorguegnru-course-foobarbaz"
        >>>                   }
        >>>               },
        >>>               "children": ["General", "Getting Started"],
        >>>               "subcategories": {
        >>>                   "Getting Started": {
        >>>                       "subcategories": {},
        >>>                       "children": [
        >>>                           "Working with Videos",
        >>>                           "Videos on edX"
        >>>                       ],
        >>>                       "entries": {
        >>>                           "Working with Videos": {
        >>>                               "sort_key": None,
        >>>                               "is_cohorted": False,
        >>>                               "id": "d9f970a42067413cbb633f81cfb12604"
        >>>                           },
        >>>                           "Videos on edX": {
        >>>                               "sort_key": None,
        >>>                               "is_cohorted": False,
        >>>                               "id": "98d8feb5971041a085512ae22b398613"
        >>>                           }
        >>>                       }
        >>>                   }
        >>>               }
        >>>          }

    """
    unexpanded_category_map = defaultdict(list)

    modules = get_accessible_discussion_modules(course, user)

    course_cohort_settings = get_course_cohort_settings(course.id)

    for module in modules:
        id = module.discussion_id
        title = module.discussion_target
        sort_key = module.sort_key
        category = " / ".join([x.strip() for x in module.discussion_category.split("/")])
        # Handle case where module.start is None
        entry_start_date = module.start if module.start else datetime.max.replace(tzinfo=pytz.UTC)
        unexpanded_category_map[category].append({"title": title, "id": id, "sort_key": sort_key, "start_date": entry_start_date})

    category_map = {"entries": defaultdict(dict), "subcategories": defaultdict(dict)}
    for category_path, entries in unexpanded_category_map.items():
        node = category_map["subcategories"]
        path = [x.strip() for x in category_path.split("/")]

        # Find the earliest start date for the entries in this category
        category_start_date = None
        for entry in entries:
            if category_start_date is None or entry["start_date"] < category_start_date:
                category_start_date = entry["start_date"]

        for level in path[:-1]:
            if level not in node:
                node[level] = {"subcategories": defaultdict(dict),
                               "entries": defaultdict(dict),
                               "sort_key": level,
                               "start_date": category_start_date}
            else:
                if node[level]["start_date"] > category_start_date:
                    node[level]["start_date"] = category_start_date
            node = node[level]["subcategories"]

        level = path[-1]
        if level not in node:
            node[level] = {"subcategories": defaultdict(dict),
                           "entries": defaultdict(dict),
                           "sort_key": level,
                           "start_date": category_start_date}
        else:
            if node[level]["start_date"] > category_start_date:
                node[level]["start_date"] = category_start_date

        always_cohort_inline_discussions = (  # pylint: disable=invalid-name
            not cohorted_if_in_list and course_cohort_settings.always_cohort_inline_discussions
        )
        dupe_counters = defaultdict(lambda: 0)  # counts the number of times we see each title
        for entry in entries:
            is_entry_cohorted = (
                course_cohort_settings.is_cohorted and (
                    always_cohort_inline_discussions or entry["id"] in course_cohort_settings.cohorted_discussions
                )
            )

            title = entry["title"]
            if node[level]["entries"][title]:
                # If we've already seen this title, append an incrementing number to disambiguate
                # the category from other categores sharing the same title in the course discussion UI.
                dupe_counters[title] += 1
                title = u"{title} ({counter})".format(title=title, counter=dupe_counters[title])
            node[level]["entries"][title] = {"id": entry["id"],
                                             "sort_key": entry["sort_key"],
                                             "start_date": entry["start_date"],
                                             "is_cohorted": is_entry_cohorted}

    # TODO.  BUG! : course location is not unique across multiple course runs!
    # (I think Kevin already noticed this)  Need to send course_id with requests, store it
    # in the backend.
    for topic, entry in course.discussion_topics.items():
        category_map['entries'][topic] = {
            "id": entry["id"],
            "sort_key": entry.get("sort_key", topic),
            "start_date": datetime.now(UTC()),
            "is_cohorted": (course_cohort_settings.is_cohorted and
                            entry["id"] in course_cohort_settings.cohorted_discussions)
        }

    _sort_map_entries(category_map, course.discussion_sort_alpha)

    return _filter_unstarted_categories(category_map) if exclude_unstarted else category_map


def get_discussion_categories_ids(course, user, include_all=False):
    """
    Returns a list of available ids of categories for the course that
    are accessible to the given user.

    Args:
        course: Course for which to get the ids.
        user:  User to check for access.
        include_all (bool): If True, return all ids. Used by configuration views.

    """
    accessible_discussion_ids = [
        module.discussion_id for module in get_accessible_discussion_modules(course, user, include_all=include_all)
    ]
    return course.top_level_discussion_topic_ids + accessible_discussion_ids


class JsonResponse(HttpResponse):
    def __init__(self, data=None):
        content = json.dumps(data, cls=i4xEncoder)
        super(JsonResponse, self).__init__(content,
                                           mimetype='application/json; charset=utf-8')


class JsonError(HttpResponse):
    def __init__(self, error_messages=[], status=400):
        if isinstance(error_messages, basestring):
            error_messages = [error_messages]
        content = json.dumps({'errors': error_messages}, indent=2, ensure_ascii=False)
        super(JsonError, self).__init__(content,
                                        mimetype='application/json; charset=utf-8', status=status)


class HtmlResponse(HttpResponse):
    def __init__(self, html=''):
        super(HtmlResponse, self).__init__(html, content_type='text/plain')


class ViewNameMiddleware(object):
    def process_view(self, request, view_func, view_args, view_kwargs):
        request.view_name = view_func.__name__


class QueryCountDebugMiddleware(object):
    """
    This middleware will log the number of queries run
    and the total time taken for each request (with a
    status code of 200). It does not currently support
    multi-db setups.
    """
    def process_response(self, request, response):
        if response.status_code == 200:
            total_time = 0

            for query in connection.queries:
                query_time = query.get('time')
                if query_time is None:
                    # django-debug-toolbar monkeypatches the connection
                    # cursor wrapper and adds extra information in each
                    # item in connection.queries. The query time is stored
                    # under the key "duration" rather than "time" and is
                    # in milliseconds, not seconds.
                    query_time = query.get('duration', 0) / 1000
                total_time += float(query_time)

            log.info('%s queries run, total %s seconds' % (len(connection.queries), total_time))
        return response


def get_ability(course_id, content, user):
    return {
        'editable': check_permissions_by_view(user, course_id, content, "update_thread" if content['type'] == 'thread' else "update_comment"),
        'can_reply': check_permissions_by_view(user, course_id, content, "create_comment" if content['type'] == 'thread' else "create_sub_comment"),
        'can_delete': check_permissions_by_view(user, course_id, content, "delete_thread" if content['type'] == 'thread' else "delete_comment"),
        'can_openclose': check_permissions_by_view(user, course_id, content, "openclose_thread") if content['type'] == 'thread' else False,
        'can_vote': check_permissions_by_view(user, course_id, content, "vote_for_thread" if content['type'] == 'thread' else "vote_for_comment"),
    }

# TODO: RENAME


def get_annotated_content_info(course_id, content, user, user_info):
    """
    Get metadata for an individual content (thread or comment)
    """
    voted = ''
    if content['id'] in user_info['upvoted_ids']:
        voted = 'up'
    elif content['id'] in user_info['downvoted_ids']:
        voted = 'down'
    return {
        'voted': voted,
        'subscribed': content['id'] in user_info['subscribed_thread_ids'],
        'ability': get_ability(course_id, content, user),
    }

# TODO: RENAME


def get_annotated_content_infos(course_id, thread, user, user_info):
    """
    Get metadata for a thread and its children
    """
    infos = {}

    def annotate(content):
        infos[str(content['id'])] = get_annotated_content_info(course_id, content, user, user_info)
        for child in (
                content.get('children', []) +
                content.get('endorsed_responses', []) +
                content.get('non_endorsed_responses', [])
        ):
            annotate(child)
    annotate(thread)
    return infos


def get_metadata_for_threads(course_id, threads, user, user_info):
    def infogetter(thread):
        return get_annotated_content_infos(course_id, thread, user, user_info)

    metadata = reduce(merge_dict, map(infogetter, threads), {})
    return metadata

# put this method in utils.py to avoid circular import dependency between helpers and mustache_helpers


def render_mustache(template_name, dictionary, *args, **kwargs):
    template = lookup_template('main', template_name).source
    return pystache.render(template, dictionary)


def permalink(content):
    if isinstance(content['course_id'], CourseKey):
        course_id = content['course_id'].to_deprecated_string()
    else:
        course_id = content['course_id']
    if content['type'] == 'thread':
        return reverse('django_comment_client.forum.views.single_thread',
                       args=[course_id, content['commentable_id'], content['id']])
    else:
        return reverse('django_comment_client.forum.views.single_thread',
                       args=[course_id, content['commentable_id'], content['thread_id']]) + '#' + content['id']


def extend_content(content):
    roles = {}
    if content.get('user_id'):
        try:
            user = User.objects.get(pk=content['user_id'])
            roles = dict(('name', role.name.lower()) for role in user.roles.filter(course_id=content['course_id']))
        except User.DoesNotExist:
            log.error('User ID {0} in comment content {1} but not in our DB.'.format(content.get('user_id'), content.get('id')))

    content_info = {
        'displayed_title': content.get('highlighted_title') or content.get('title', ''),
        'displayed_body': content.get('highlighted_body') or content.get('body', ''),
        'permalink': permalink(content),
        'roles': roles,
        'updated': content['created_at'] != content['updated_at'],
    }
    return merge_dict(content, content_info)


def add_courseware_context(content_list, course, user, id_map=None):
    """
    Decorates `content_list` with courseware metadata.
    """
    if id_map is None:
        id_map = get_discussion_id_map(course, user)

    for content in content_list:
        commentable_id = content['commentable_id']
        if commentable_id in id_map:
            location = id_map[commentable_id]["location"].to_deprecated_string()
            title = id_map[commentable_id]["title"]

            url = reverse('jump_to', kwargs={"course_id": course.id.to_deprecated_string(),
                          "location": location})

            content.update({"courseware_url": url, "courseware_title": title})


def prepare_content(content, course_key, is_staff=False, course_is_cohorted=None):
    """
    This function is used to pre-process thread and comment models in various
    ways before adding them to the HTTP response.  This includes fixing empty
    attribute fields, enforcing author anonymity, and enriching metadata around
    group ownership and response endorsement.

    @TODO: not all response pre-processing steps are currently integrated into
    this function.

    Arguments:
        content (dict): A thread or comment.
        course_key (CourseKey): The course key of the course.
        is_staff (bool): Whether the user is a staff member.
        course_is_cohorted (bool): Whether the course is cohorted.
    """
    fields = [
        'id', 'title', 'body', 'course_id', 'anonymous', 'anonymous_to_peers',
        'endorsed', 'parent_id', 'thread_id', 'votes', 'closed', 'created_at',
        'updated_at', 'depth', 'type', 'commentable_id', 'comments_count',
        'at_position_list', 'children', 'highlighted_title', 'highlighted_body',
        'courseware_title', 'courseware_url', 'unread_comments_count',
        'read', 'group_id', 'group_name', 'pinned', 'abuse_flaggers',
        'stats', 'resp_skip', 'resp_limit', 'resp_total', 'thread_type',
        'endorsed_responses', 'non_endorsed_responses', 'non_endorsed_resp_total',
        'endorsement',
    ]

    if (content.get('anonymous') is False) and ((content.get('anonymous_to_peers') is False) or is_staff):
        fields += ['username', 'user_id']

    content = strip_none(extract(content, fields))

    if content.get("endorsement"):
        endorsement = content["endorsement"]
        endorser = None
        if endorsement["user_id"]:
            try:
                endorser = User.objects.get(pk=endorsement["user_id"])
            except User.DoesNotExist:
                log.error("User ID {0} in endorsement for comment {1} but not in our DB.".format(
                    content.get('user_id'),
                    content.get('id'))
                )

        # Only reveal endorser if requester can see author or if endorser is staff
        if (
                endorser and
                ("username" in fields or has_permission(endorser, "endorse_comment", course_key))
        ):
            endorsement["username"] = endorser.username
        else:
            del endorsement["user_id"]

    if course_is_cohorted is None:
        course_is_cohorted = is_course_cohorted(course_key)

    for child_content_key in ["children", "endorsed_responses", "non_endorsed_responses"]:
        if child_content_key in content:
            children = [
                prepare_content(child, course_key, is_staff, course_is_cohorted=course_is_cohorted)
                for child in content[child_content_key]
            ]
            content[child_content_key] = children

    if course_is_cohorted:
        # Augment the specified thread info to include the group name if a group id is present.
        if content.get('group_id') is not None:
            content['group_name'] = get_cohort_by_id(course_key, content.get('group_id')).name
    else:
        # Remove any cohort information that might remain if the course had previously been cohorted.
        content.pop('group_id', None)

    return content


def get_group_id_for_comments_service(request, course_key, commentable_id=None):
    """
    Given a user requesting content within a `commentable_id`, determine the
    group_id which should be passed to the comments service.

    Returns:
        int: the group_id to pass to the comments service or None if nothing
        should be passed

    Raises:
        ValueError if the requested group_id is invalid
    """
    if commentable_id is None or is_commentable_cohorted(course_key, commentable_id):
        if request.method == "GET":
            requested_group_id = request.GET.get('group_id')
        elif request.method == "POST":
            requested_group_id = request.POST.get('group_id')
        if has_permission(request.user, "see_all_cohorts", course_key):
            if not requested_group_id:
                return None
            try:
                group_id = int(requested_group_id)
                get_cohort_by_id(course_key, group_id)
            except CourseUserGroup.DoesNotExist:
                raise ValueError
        else:
            # regular users always query with their own id.
            group_id = get_cohort_id(request.user, course_key)
        return group_id
    else:
        # Never pass a group_id to the comments service for a non-cohorted
        # commentable
        return None
