use std::sync::Arc;

use activitypub_base::ApObjectHandler;
use async_trait::async_trait;
use domain::{
    models::{Review, ReviewSource},
    ports::MovieRepository,
    value_objects::{Comment, MovieId, Rating, ReviewId, UserId},
};
use url::Url;

use crate::objects::{review_to_ap_object, ReviewObject};
use crate::remote_review_repository::RemoteReviewRepository;
use crate::urls::{actor_url, review_url};

pub struct ReviewObjectHandler {
    pub movie_repo: Arc<dyn MovieRepository>,
    pub review_store: Arc<dyn RemoteReviewRepository>,
    pub base_url: String,
}

#[async_trait]
impl ApObjectHandler for ReviewObjectHandler {
    async fn get_local_objects_for_user(
        &self,
        user_id: uuid::Uuid,
    ) -> anyhow::Result<Vec<(Url, serde_json::Value)>> {
        let domain_user_id = UserId::from_uuid(user_id);
        let history = self.movie_repo.get_user_history(&domain_user_id).await?;

        let mut results = Vec::new();
        for entry in history {
            let review = entry.review();
            if !matches!(review.source(), ReviewSource::Local) {
                continue;
            }

            let ap_id = review_url(&self.base_url, review.id());
            let actor_url = actor_url(&self.base_url, user_id);

            let movie = self.movie_repo.get_movie_by_id(review.movie_id()).await.ok().flatten();
            let movie_title = movie.as_ref()
                .map(|m| m.title().value().to_string())
                .unwrap_or_else(|| "Unknown".to_string());
            let release_year = movie.as_ref()
                .map(|m| m.release_year().value())
                .unwrap_or(0);
            let poster_url = movie.as_ref()
                .and_then(|m| m.poster_path())
                .map(|p| format!("{}/posters/{}", self.base_url, p.value()));

            let obj = review_to_ap_object(review, ap_id.clone(), actor_url, movie_title, release_year, poster_url);
            let json = serde_json::to_value(obj)?;
            results.push((ap_id, json));
        }
        Ok(results)
    }

    async fn on_create(
        &self,
        _ap_id: &Url,
        _actor_url: &Url,
        object: serde_json::Value,
    ) -> anyhow::Result<()> {
        let obj: ReviewObject = match serde_json::from_value(object) {
            Ok(o) => o,
            Err(e) => {
                tracing::debug!("ignoring unrecognized Create object: {}", e);
                return Ok(());
            }
        };

        let actor_url_str = obj.attributed_to.to_string();
        let review_id = ReviewId::generate();
        let movie_id = MovieId::from_uuid(uuid::Uuid::new_v5(&uuid::Uuid::NAMESPACE_URL, obj.movie_title.as_bytes()));
        let user_id = UserId::from_uuid(uuid::Uuid::new_v5(&uuid::Uuid::NAMESPACE_URL, actor_url_str.as_bytes()));
        let rating = Rating::new(obj.rating.min(5))?;
        let comment = obj.comment.map(Comment::new).transpose()?;

        let review = Review::from_persistence(
            review_id,
            movie_id,
            user_id,
            rating,
            comment,
            obj.watched_at.naive_utc(),
            obj.published.naive_utc(),
            ReviewSource::Remote { actor_url: actor_url_str },
        );

        self.review_store
            .save_remote_review(&review, obj.id.as_str(), &obj.movie_title, obj.release_year, obj.poster_url.as_deref())
            .await?;

        Ok(())
    }

    async fn on_update(
        &self,
        ap_id: &Url,
        actor_url: &Url,
        object: serde_json::Value,
    ) -> anyhow::Result<()> {
        let obj: ReviewObject = match serde_json::from_value(object) {
            Ok(o) => o,
            Err(_) => {
                tracing::debug!(actor = %actor_url, "ignoring non-review Update activity");
                return Ok(());
            }
        };

        if obj.attributed_to != *actor_url {
            anyhow::bail!("update actor does not match object attributed_to");
        }

        self.review_store
            .update_remote_review(
                ap_id.as_str(),
                actor_url.as_str(),
                obj.rating.min(5),
                obj.comment.as_deref(),
                obj.watched_at.naive_utc(),
            )
            .await?;

        Ok(())
    }

    async fn on_delete(&self, ap_id: &Url, actor_url: &Url) -> anyhow::Result<()> {
        self.review_store
            .delete_remote_review(ap_id.as_str(), actor_url.as_str())
            .await
    }

    async fn on_actor_removed(&self, actor_url: &Url) -> anyhow::Result<()> {
        self.review_store.delete_by_actor(actor_url.as_str()).await
    }
}