from boards.models import Tag
from boards.models.thread import FAV_THREAD_NO_UPDATES

MAX_TRIPCODE_COLLISIONS = 50

__author__ = 'neko259'

SESSION_SETTING = 'setting'

# Remove this, it is not used any more cause there is a user's permission
PERMISSION_MODERATE = 'moderator'

SETTING_THEME = 'theme'
SETTING_FAVORITE_TAGS = 'favorite_tags'
SETTING_FAVORITE_THREADS = 'favorite_threads'
SETTING_HIDDEN_TAGS = 'hidden_tags'
SETTING_PERMISSIONS = 'permissions'
SETTING_USERNAME = 'username'
SETTING_LAST_NOTIFICATION_ID = 'last_notification'
SETTING_IMAGE_VIEWER = 'image_viewer'
SETTING_TRIPCODE = 'tripcode'

DEFAULT_THEME = 'md'


class SettingsManager:
    """
    Base settings manager class. get_setting and set_setting methods should
    be overriden.
    """
    def __init__(self):
        pass

    def get_theme(self) -> str:
        theme = self.get_setting(SETTING_THEME)
        if not theme:
            theme = DEFAULT_THEME
            self.set_setting(SETTING_THEME, theme)

        return theme

    def set_theme(self, theme):
        self.set_setting(SETTING_THEME, theme)

    def has_permission(self, permission):
        permissions = self.get_setting(SETTING_PERMISSIONS)
        if permissions:
            return permission in permissions
        else:
            return False

    def get_setting(self, setting, default=None):
        pass

    def set_setting(self, setting, value):
        pass

    def add_permission(self, permission):
        permissions = self.get_setting(SETTING_PERMISSIONS)
        if not permissions:
            permissions = [permission]
        else:
            permissions.append(permission)
        self.set_setting(SETTING_PERMISSIONS, permissions)

    def del_permission(self, permission):
        permissions = self.get_setting(SETTING_PERMISSIONS)
        if not permissions:
            permissions = []
        else:
            permissions.remove(permission)
        self.set_setting(SETTING_PERMISSIONS, permissions)

    def get_fav_tags(self) -> list:
        tag_names = self.get_setting(SETTING_FAVORITE_TAGS)
        tags = []
        if tag_names:
            tags = list(Tag.objects.filter(name__in=tag_names))
        return tags

    def add_fav_tag(self, tag):
        tags = self.get_setting(SETTING_FAVORITE_TAGS)
        if not tags:
            tags = [tag.name]
        else:
            if not tag.name in tags:
                tags.append(tag.name)

        tags.sort()
        self.set_setting(SETTING_FAVORITE_TAGS, tags)

    def del_fav_tag(self, tag):
        tags = self.get_setting(SETTING_FAVORITE_TAGS)
        if tag.name in tags:
            tags.remove(tag.name)
            self.set_setting(SETTING_FAVORITE_TAGS, tags)

    def get_hidden_tags(self) -> list:
        tag_names = self.get_setting(SETTING_HIDDEN_TAGS)
        tags = []
        if tag_names:
            tags = list(Tag.objects.filter(name__in=tag_names))

        return tags

    def add_hidden_tag(self, tag):
        tags = self.get_setting(SETTING_HIDDEN_TAGS)
        if not tags:
            tags = [tag.name]
        else:
            if not tag.name in tags:
                tags.append(tag.name)

        tags.sort()
        self.set_setting(SETTING_HIDDEN_TAGS, tags)

    def del_hidden_tag(self, tag):
        tags = self.get_setting(SETTING_HIDDEN_TAGS)
        if tag.name in tags:
            tags.remove(tag.name)
            self.set_setting(SETTING_HIDDEN_TAGS, tags)

    def get_fav_threads(self) -> dict:
        return self.get_setting(SETTING_FAVORITE_THREADS, default=dict())

    def add_or_read_fav_thread(self, opening_post):
        threads = self.get_fav_threads()
        thread = opening_post.get_thread()
        # Don't check for new posts if the thread is archived already
        if thread.is_archived():
            last_id = FAV_THREAD_NO_UPDATES
        else:
            last_id = thread.get_replies().last().id
        threads[str(opening_post.id)] = last_id
        self.set_setting(SETTING_FAVORITE_THREADS, threads)

    def del_fav_thread(self, opening_post):
        threads = self.get_fav_threads()
        if self.thread_is_fav(opening_post):
            del threads[str(opening_post.id)]
            self.set_setting(SETTING_FAVORITE_THREADS, threads)

    def thread_is_fav(self, opening_post):
        return str(opening_post.id) in self.get_fav_threads()

    def get_notification_usernames(self):
        names = set()
        name_list = self.get_setting(SETTING_USERNAME)
        if name_list is not None:
            name_list = name_list.strip()
            if len(name_list) > 0:
                names = name_list.lower().split(',')
                names = set(name.strip() for name in names)
        return names


class SessionSettingsManager(SettingsManager):
    """
    Session-based settings manager. All settings are saved to the user's
    session.
    """
    def __init__(self, session):
        SettingsManager.__init__(self)
        self.session = session

    def get_setting(self, setting, default=None):
        if setting in self.session:
            return self.session[setting]
        else:
            self.set_setting(setting, default)
            return default

    def set_setting(self, setting, value):
        self.session[setting] = value


def get_settings_manager(request) -> SettingsManager:
    """
    Get settings manager based on the request object. Currently only
    session-based manager is supported. In the future, cookie-based or
    database-based managers could be implemented.
    """
    return SessionSettingsManager(request.session)