use anyhow::{anyhow, Result};
use chrono::{DateTime, Utc};
use sqlx::FromRow;

use crate::repo::Storage;
use crate::room::RoomId;

#[derive(FromRow)]
pub struct StoredRoom {
    pub id: u32,
    pub name: String,
    pub topic: String,
    pub message_count: u32,
}

impl Storage {
    #[tracing::instrument(skip(self), name = "Storage::retrieve_room_by_name")]
    pub async fn retrieve_room_by_name(&self, name: &str) -> Result<Option<StoredRoom>> {
        let mut executor = self.conn.lock().await;
        let res = sqlx::query_as(
            "select id, name, topic, message_count
            from rooms
            where name = ?;",
        )
        .bind(name)
        .fetch_optional(&mut *executor)
        .await?;

        Ok(res)
    }

    #[tracing::instrument(skip(self, topic), name = "Storage::create_new_room")]
    pub async fn create_new_room(&self, name: &str, topic: &str) -> Result<u32> {
        let mut executor = self.conn.lock().await;
        let (id,): (u32,) = sqlx::query_as(
            "insert into rooms(name, topic)
            values (?, ?)
            returning id;",
        )
        .bind(name)
        .bind(topic)
        .fetch_one(&mut *executor)
        .await?;

        Ok(id)
    }

    #[tracing::instrument(skip(self, content, created_at), name = "Storage::insert_room_message")]
    pub async fn insert_room_message(
        &self,
        room_id: u32,
        id: u32,
        content: &str,
        author_id: &str,
        created_at: &DateTime<Utc>,
    ) -> Result<()> {
        let mut executor = self.conn.lock().await;
        let res: Option<(u32,)> = sqlx::query_as("select id from users where name = ?;")
            .bind(author_id)
            .fetch_optional(&mut *executor)
            .await?;
        let Some((author_id,)) = res else {
            return Err(anyhow!("No such user"));
        };
        sqlx::query(
            "insert into messages(room_id, id, content, author_id, created_at)
            values (?, ?, ?, ?, ?);
            update rooms set message_count = message_count + 1 where id = ?;",
        )
        .bind(room_id)
        .bind(id)
        .bind(content)
        .bind(author_id)
        .bind(created_at.to_string())
        .bind(room_id)
        .execute(&mut *executor)
        .await?;

        Ok(())
    }

    #[tracing::instrument(skip(self), name = "Storage::is_room_member")]
    pub async fn is_room_member(&self, room_id: u32, player_id: u32) -> Result<bool> {
        let mut executor = self.conn.lock().await;
        let res: (u32,) = sqlx::query_as(
            "
                select
                    count(*)
                from
                    memberships
                where
                    user_id = ? and room_id = ?;
                ",
        )
        .bind(player_id)
        .bind(room_id)
        .fetch_one(&mut *executor)
        .await?;
        Ok(res.0 > 0)
    }

    #[tracing::instrument(skip(self), name = "Storage::add_room_member")]
    pub async fn add_room_member(&self, room_id: u32, player_id: u32) -> Result<()> {
        let mut executor = self.conn.lock().await;
        sqlx::query(
            "insert into memberships(user_id, room_id, status)
            values (?, ?, 1);",
        )
        .bind(player_id)
        .bind(room_id)
        .execute(&mut *executor)
        .await?;

        Ok(())
    }

    #[tracing::instrument(skip(self), name = "Storage::remove_room_member")]
    pub async fn remove_room_member(&self, room_id: u32, player_id: u32) -> Result<()> {
        let mut executor = self.conn.lock().await;
        sqlx::query(
            "delete from memberships
            where user_id = ? and room_id = ?;",
        )
        .bind(player_id)
        .bind(room_id)
        .execute(&mut *executor)
        .await?;

        Ok(())
    }

    #[tracing::instrument(skip(self, topic), name = "Storage::set_room_topic")]
    pub async fn set_room_topic(&self, id: u32, topic: &str) -> Result<()> {
        let mut executor = self.conn.lock().await;
        sqlx::query(
            "update rooms
            set topic = ?
            where id = ?;",
        )
        .bind(topic)
        .bind(id)
        .fetch_optional(&mut *executor)
        .await?;

        Ok(())
    }

    #[tracing::instrument(skip(self), name = "Storage::create_or_retrieve_room_id_by_name")]
    pub async fn create_or_retrieve_room_id_by_name(&self, name: &str) -> Result<u32> {
        // TODO we don't need any info except the name on non-owning nodes, should remove stubs here
        let mut executor = self.conn.lock().await;
        let res: (u32,) = sqlx::query_as(
            "insert into rooms(name, topic)
            values (?, '')
            on conflict(name) do update set name = excluded.name
            returning id;",
        )
        .bind(name)
        .fetch_one(&mut *executor)
        .await?;

        Ok(res.0)
    }

    #[tracing::instrument(skip(self), name = "Storage::get_rooms_of_a_user")]
    pub async fn get_rooms_of_a_user(&self, user_id: u32) -> Result<Vec<RoomId>> {
        let mut executor = self.conn.lock().await;
        let res: Vec<(String,)> = sqlx::query_as(
            "select r.name
            from memberships m inner join rooms r on m.room_id = r.id
            where m.user_id = ?;",
        )
        .bind(user_id)
        .fetch_all(&mut *executor)
        .await?;

        res.into_iter().map(|(room_id,)| RoomId::from(room_id)).collect()
    }
}