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use crate::errors::Error;
use rand::prelude::*;
use std::{mem::zeroed, sync::Arc};
use tokio::sync::Mutex;
use tokio_postgres::{Client, NoTls};
pub static mut _client: Option<Client> = None;
lazy_static! {
static ref CLIENT: Client = unsafe { _client.take().unwrap() };
}
pub async fn initialize_db() -> Result<(), Error> {
let client = &CLIENT;
client
.batch_execute(
r#"
CREATE TABLE IF NOT EXISTS track (
track_id SERIAL PRIMARY KEY,
track_code TEXT NOT NULL UNIQUE,
name TEXT NOT NULL,
artist TEXT NOT NULL,
popularity int DEFAULT 50
);
CREATE TABLE IF NOT EXISTS lobby (
lobby_id SERIAL PRIMARY KEY,
token TEXT NOT NULL UNIQUE,
lobby_name TEXT NOT NULL
);
CREATE TABLE IF NOT EXISTS suser (
user_id SERIAL PRIMARY KEY,
user_name TEXT NOT NULL,
lobby_id int REFERENCES lobby (lobby_id) ON UPDATE CASCADE ON DELETE CASCADE,
CONSTRAINT suser_name_lobby UNIQUE (lobby_id, user_name)
);
CREATE TABLE IF NOT EXISTS user_track_raw (
track_id int REFERENCES track (track_id) ON UPDATE CASCADE ON DELETE CASCADE,
user_id int REFERENCES suser (user_id) ON UPDATE CASCADE ON DELETE CASCADE,
count int NOT NULL DEFAULT 1,
CONSTRAINT track_user_pkey PRIMARY KEY (track_id, user_id)
);
CREATE OR REPLACE VIEW user_track AS (
SELECT *, "count" / (
SELECT SUM("count")
FROM user_track_raw AS ut
WHERE ut.user_id = user_id
)::decimal AS score
FROM user_track_raw
);
"#,
)
.await?;
Ok(())
}
use rspotify::model::track::FullTrack;
pub async fn insert_track(user_id: i32, track: FullTrack, weight: i32) -> Result<(), Error> {
let client = &CLIENT;
if track.id.is_none() {
println!("{:#?}", track);
return Err("failed to load get track information".into());
}
print!(" {} ", track.id.clone()?);
client
.execute(
"INSERT INTO track (track_code, name, artist, popularity)
VALUES ($1, $2, $3, $4)
ON CONFLICT DO NOTHING",
&[
&(track.id.clone()?),
&track.name,
&track.artists[0].name,
&(track.popularity as i32),
],
)
.await?;
let track_id: i32 = client
.query(
"SELECT track_id FROM track where track_code = $1;",
&[&(track.id?)],
)
.await?[0]
.get(0);
println!("uid: {} tid: {}", user_id, track_id);
client
.execute(
"
INSERT INTO user_track_raw (track_id, user_id, count)
VALUES ($1, $2, $3)
ON CONFLICT
ON CONSTRAINT track_user_pkey
DO NOTHING;
",
&[&track_id, &user_id, &0],
)
.await?;
client
.execute(
"UPDATE user_track SET count = count + $3 WHERE track_id = $1 AND user_id = $2;",
&[&track_id, &user_id, &weight],
)
.await?;
Ok(())
}
pub async fn insert_user(name: &str, lobby: &str) -> Result<i32, Error> {
let client = &CLIENT;
let x = get_lid(lobby, &*client).await?;
client.execute(
"INSERT INTO suser (user_name, lobby_id) VALUES ($1, $2) ON CONFLICT (user_name, lobby_id) DO NOTHING;",
&[&name, &x],
).await?;
let db_user_id = get_uid(name, lobby, &*client).await?;
client
.execute("DELETE FROM user_track WHERE user_id = $1;", &[&db_user_id])
.await?;
Ok(db_user_id)
}
async fn get_lid(lobby: &str, client: &Client) -> Result<i32, Error> {
let x: i32 = client
.query_one("SELECT lobby_id FROM lobby WHERE token = $1;", &[&lobby])
.await?
.get(0);
Ok(x)
}
async fn get_uid(name: &str, lobby: &str, client: &Client) -> Result<i32, Error> {
let x: i32 = client
.query_one("SELECT user_id FROM suser JOIN lobby USING (lobby_id) WHERE user_name = $1 AND token = $2;", &[&name, &lobby]).await?
.get(0);
Ok(x)
}
pub async fn match_users(lobby: String, names: &[&str]) -> Result<String, Error> {
let client = &CLIENT;
let mut songs = String::new();
let names: Vec<String> = names.iter().map(|x| x.trim().to_string()).collect();
//let users: Vec<&str> = names.iter().map(|x| x.as_str()).collect();
//println!("users to match: {:?}", users);
let placeholders =
(2..=(names.len() + 1)).fold(String::new(), |p, a| format!("{}, (${})", p, a));
let placeholders: String = placeholders.chars().skip(2).collect();
let query = format!(
"
WITH users AS (
SELECT *
FROM ( VALUES {} ) AS _ (user_id)
)
SELECT track_id, name, artist
FROM track
JOIN (
SELECT track_id
FROM user_track
JOIN suser USING (user_id)
JOIN track USING (track_id)
JOIN lobby USING (lobby_id)
WHERE suser.user_name IN (SELECT * FROM users) AND token = $1
GROUP BY track_id
HAVING COUNT(track_id) = (SELECT COUNT(*) FROM users)
ORDER BY EXP(SUM(LN(score))) DESC
) AS _ USING (track_id)
;
",
placeholders
);
let mut values = vec![lobby];
values.extend(names);
println!("{:?}", values);
use futures::{pin_mut, TryStreamExt};
let it = client.query_raw(query.as_str(), values).await?;
pin_mut!(it);
while let Some(row) = it.try_next().await? {
let name: String = row.get(1);
let artist: String = row.get(2);
songs = format!("{}{} by {}\n", songs, name, artist);
}
Ok(songs)
}
pub async fn get_users(lobby: &str) -> Result<String, Error> {
let client = &CLIENT;
let mut users = String::new();
for row in client
.query(
"SELECT user_name FROM suser JOIN lobby USING (lobby_id) WHERE token = $1",
&[&lobby],
)
.await?
{
let user: String = row.get(0);
users = format!("{}{}\n", users, user);
}
Ok(users)
}
pub async fn create_lobby(name: &str) -> Result<String, Error> {
let client = &CLIENT;
let mut token = String::new();
while token.is_empty()
|| client
.query_one("SELECT lobby_id FROM lobby WHERE token = $1", &[&token])
.await
.is_ok()
{
let rand: [u8; 20] = rand::thread_rng().gen();
token = base64::encode_config(&rand, base64::URL_SAFE);
}
client
.execute(
"INSERT INTO lobby (token, lobby_name) VALUES ($1, $2);",
&[&token, &name],
)
.await?;
Ok(token)
}
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