use activitypub::activity::{Announce, Undo};
use chrono::NaiveDateTime;
use diesel::{self, ExpressionMethods, QueryDsl, RunQueryDsl};

use notifications::*;
use plume_common::activity_pub::{
    inbox::{Deletable, FromActivity, Notify},
    Id, IntoId, PUBLIC_VISIBILTY,
};
use posts::Post;
use schema::reshares;
use users::User;
use Connection;

#[derive(Clone, Serialize, Deserialize, Queryable, Identifiable)]
pub struct Reshare {
    pub id: i32,
    pub user_id: i32,
    pub post_id: i32,
    pub ap_url: String,
    pub creation_date: NaiveDateTime,
}

#[derive(Insertable)]
#[table_name = "reshares"]
pub struct NewReshare {
    pub user_id: i32,
    pub post_id: i32,
    pub ap_url: String,
}

impl Reshare {
    insert!(reshares, NewReshare);
    get!(reshares);
    find_by!(reshares, find_by_ap_url, ap_url as &str);
    find_by!(
        reshares,
        find_by_user_on_post,
        user_id as i32,
        post_id as i32
    );

    pub fn update_ap_url(&self, conn: &Connection) {
        if self.ap_url.is_empty() {
            diesel::update(self)
                .set(reshares::ap_url.eq(format!(
                        "{}/reshare/{}",
                        User::get(conn, self.user_id)
                            .expect("Reshare::update_ap_url: user error")
                            .ap_url,
                        Post::get(conn, self.post_id)
                            .expect("Reshare::update_ap_url: post error")
                            .ap_url
                    )))
                .execute(conn)
                .expect("Reshare::update_ap_url: update error");
        }
    }

    pub fn get_recents_for_author(conn: &Connection, user: &User, limit: i64) -> Vec<Reshare> {
        reshares::table
            .filter(reshares::user_id.eq(user.id))
            .order(reshares::creation_date.desc())
            .limit(limit)
            .load::<Reshare>(conn)
            .expect("Reshare::get_recents_for_author: loading error")
    }

    pub fn get_post(&self, conn: &Connection) -> Option<Post> {
        Post::get(conn, self.post_id)
    }

    pub fn get_user(&self, conn: &Connection) -> Option<User> {
        User::get(conn, self.user_id)
    }

    pub fn to_activity(&self, conn: &Connection) -> Announce {
        let mut act = Announce::default();
        act.announce_props
            .set_actor_link(
                User::get(conn, self.user_id)
                    .expect("Reshare::to_activity: user error")
                    .into_id(),
            )
            .expect("Reshare::to_activity: actor error");
        act.announce_props
            .set_object_link(
                Post::get(conn, self.post_id)
                    .expect("Reshare::to_activity: post error")
                    .into_id(),
            )
            .expect("Reshare::to_activity: object error");
        act.object_props
            .set_id_string(self.ap_url.clone())
            .expect("Reshare::to_activity: id error");
        act.object_props
            .set_to_link(Id::new(PUBLIC_VISIBILTY.to_string()))
            .expect("Reshare::to_activity: to error");
        act.object_props
            .set_cc_link_vec::<Id>(vec![])
            .expect("Reshare::to_activity: cc error");

        act
    }
}

impl FromActivity<Announce, Connection> for Reshare {
    fn from_activity(conn: &Connection, announce: Announce, _actor: Id) -> Reshare {
        let user = User::from_url(
            conn,
            announce
                .announce_props
                .actor_link::<Id>()
                .expect("Reshare::from_activity: actor error")
                .as_ref(),
        );
        let post = Post::find_by_ap_url(
            conn,
            announce
                .announce_props
                .object_link::<Id>()
                .expect("Reshare::from_activity: object error")
                .as_ref(),
        );
        let reshare = Reshare::insert(
            conn,
            NewReshare {
                post_id: post.expect("Reshare::from_activity: post error").id,
                user_id: user.expect("Reshare::from_activity: user error").id,
                ap_url: announce
                    .object_props
                    .id_string()
                    .unwrap_or_default(),
            },
        );
        reshare.notify(conn);
        reshare
    }
}

impl Notify<Connection> for Reshare {
    fn notify(&self, conn: &Connection) {
        let post = self.get_post(conn).expect("Reshare::notify: post error");
        for author in post.get_authors(conn) {
            Notification::insert(
                conn,
                NewNotification {
                    kind: notification_kind::RESHARE.to_string(),
                    object_id: self.id,
                    user_id: author.id,
                },
            );
        }
    }
}

impl Deletable<Connection, Undo> for Reshare {
    fn delete(&self, conn: &Connection) -> Undo {
        diesel::delete(self)
            .execute(conn)
            .expect("Reshare::delete: delete error");

        // delete associated notification if any
        if let Some(notif) = Notification::find(conn, notification_kind::RESHARE, self.id) {
            diesel::delete(&notif)
                .execute(conn)
                .expect("Reshare::delete: notification error");
        }

        let mut act = Undo::default();
        act.undo_props
            .set_actor_link(
                User::get(conn, self.user_id)
                    .expect("Reshare::delete: user error")
                    .into_id(),
            )
            .expect("Reshare::delete: actor error");
        act.undo_props
            .set_object_object(self.to_activity(conn))
            .expect("Reshare::delete: object error");
        act.object_props
            .set_id_string(format!("{}#delete", self.ap_url))
            .expect("Reshare::delete: id error");
        act.object_props
            .set_to_link(Id::new(PUBLIC_VISIBILTY.to_string()))
            .expect("Reshare::delete: to error");
        act.object_props
            .set_cc_link_vec::<Id>(vec![])
            .expect("Reshare::delete: cc error");

        act
    }

    fn delete_id(id: &str, actor_id: &str, conn: &Connection) {
        if let Some(reshare) = Reshare::find_by_ap_url(conn, id) {
            if let Some(actor) = User::find_by_ap_url(conn, actor_id) {
                if actor.id == reshare.user_id {
                    reshare.delete(conn);
                }
            }
        }
    }
}