from sqlalchemy import event

from cache.revalidator import revalidation_manager
from orm.author import Author, AuthorFollower
from orm.reaction import Reaction, ReactionKind
from orm.shout import Shout, ShoutAuthor, ShoutReactionsFollower
from orm.topic import Topic, TopicFollower
from utils.logger import root_logger as logger


def mark_for_revalidation(entity, *args):
    """Отметка сущности для ревалидации."""
    entity_type = (
        "authors"
        if isinstance(entity, Author)
        else "topics"
        if isinstance(entity, Topic)
        else "reactions"
        if isinstance(entity, Reaction)
        else "shouts"
        if isinstance(entity, Shout)
        else None
    )
    if entity_type:
        revalidation_manager.mark_for_revalidation(entity.id, entity_type)


def after_follower_handler(mapper, connection, target, is_delete=False):
    """Обработчик добавления, обновления или удаления подписки."""
    entity_type = None
    if isinstance(target, AuthorFollower):
        entity_type = "authors"
    elif isinstance(target, TopicFollower):
        entity_type = "topics"
    elif isinstance(target, ShoutReactionsFollower):
        entity_type = "shouts"

    if entity_type:
        revalidation_manager.mark_for_revalidation(
            target.author if entity_type == "authors" else target.topic, entity_type
        )
        if not is_delete:
            revalidation_manager.mark_for_revalidation(target.follower, "authors")


def after_shout_handler(mapper, connection, target):
    """Обработчик изменения статуса публикации"""
    if not isinstance(target, Shout):
        return
        
    # Проверяем изменение статуса публикации
    was_published = target.published_at is not None and target.deleted_at is None
    
    if was_published:
        # Обновляем счетчики для авторов
        for author in target.authors:
            revalidation_manager.mark_for_revalidation(author.id, "authors")
            
        # Обновляем счетчики для тем
        for topic in target.topics:
            revalidation_manager.mark_for_revalidation(topic.id, "topics")


def after_reaction_handler(mapper, connection, target):
    """Обработчик для комментариев"""
    if not isinstance(target, Reaction) or target.kind != ReactionKind.COMMENT.value:
        return
        
    # Проверяем что комментарий относится к опубликованному посту
    shout = target.shout
    if shout and shout.published_at and not shout.deleted_at:
        # Обновляем счетчики для автора комментария
        revalidation_manager.mark_for_revalidation(target.created_by.id, "authors")
        
        # Обновляем счетчики для поста
        revalidation_manager.mark_for_revalidation(shout.id, "shouts")


def events_register():
    """Регистрация обработчиков событий для всех сущностей."""
    event.listen(ShoutAuthor, "after_insert", mark_for_revalidation)
    event.listen(ShoutAuthor, "after_update", mark_for_revalidation)
    event.listen(ShoutAuthor, "after_delete", mark_for_revalidation)

    event.listen(AuthorFollower, "after_insert", after_follower_handler)
    event.listen(AuthorFollower, "after_update", after_follower_handler)
    event.listen(AuthorFollower, "after_delete", lambda *args: after_follower_handler(*args, is_delete=True))

    event.listen(TopicFollower, "after_insert", after_follower_handler)
    event.listen(TopicFollower, "after_update", after_follower_handler)
    event.listen(TopicFollower, "after_delete", lambda *args: after_follower_handler(*args, is_delete=True))

    event.listen(ShoutReactionsFollower, "after_insert", after_follower_handler)
    event.listen(ShoutReactionsFollower, "after_update", after_follower_handler)
    event.listen(ShoutReactionsFollower, "after_delete", lambda *args: after_follower_handler(*args, is_delete=True))

    event.listen(Reaction, "after_update", mark_for_revalidation)
    event.listen(Author, "after_update", mark_for_revalidation)
    event.listen(Topic, "after_update", mark_for_revalidation)
    event.listen(Shout, "after_update", after_shout_handler)

    event.listen(Reaction, "after_insert", after_reaction_handler)
    event.listen(Reaction, "after_delete", after_reaction_handler)

    logger.info("Event handlers registered successfully.")