StartRNR/src/datasets.rs

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use crate::queries::*;
use sqlite::*;
use std::fs::{self, OpenOptions};
use std::io;
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use std::path::{Path, PathBuf};
/// Return the default path to the datasets file.
fn default_datasets_path(config_dir: &Path) -> io::Result<PathBuf> {
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let mut path = config_dir.to_owned();
path.push("ggelo");
// Create datasets path if it doesn't exist
fs::create_dir_all(&path)?;
path.push("ggelo.db");
// Create datasets file if it doesn't exist
OpenOptions::new().write(true).create(true).open(&path)?;
Ok(path)
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}
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pub fn open_datasets(config_dir: &Path) -> sqlite::Result<Connection> {
let path = default_datasets_path(config_dir).unwrap();
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let query = "
CREATE TABLE IF NOT EXISTS datasets (
name TEXT UNIQUE NOT NULL
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) STRICT;";
let connection = sqlite::open(path)?;
connection.execute(query)?;
Ok(connection)
}
// TODO: Sanitize dataset names
pub fn list_datasets(connection: &Connection) -> sqlite::Result<Vec<String>> {
let query = "SELECT * FROM datasets";
connection
.prepare(query)?
.into_iter()
.map(|x| x.map(|r| r.read::<&str, _>("name").to_owned()))
.try_collect()
}
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pub fn delete_dataset(connection: &Connection, dataset: &str) -> sqlite::Result<()> {
let query = format!(
r#"DELETE FROM datasets WHERE name = '{0}';
DROP TABLE "dataset_{0}";"#,
dataset
);
connection.execute(query)
}
pub fn new_dataset(connection: &Connection, dataset: &str) -> sqlite::Result<()> {
let query = format!(
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r#"INSERT INTO datasets VALUES ('{0}');
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CREATE TABLE IF NOT EXISTS "dataset_{0}" (
id INTEGER PRIMARY KEY,
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name TEXT,
prefix TEXT,
elo REAL NOT NULL
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) STRICT;"#,
dataset
);
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connection.execute(query)
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}
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// Score calculation
/// Calculate the collective expected score for each team.
fn expected_scores(ratings: &Teams<&mut f64>) -> Vec<f64> {
let qs: Vec<f64> = ratings
.into_iter()
.map(|es| 10_f64.powf(es.iter().map(|x| **x).sum::<f64>() / es.len() as f64 / 400.0))
.collect();
let sumq: f64 = qs.iter().sum();
qs.into_iter().map(|q| q / sumq).collect()
}
/// Adjust the ratings of each player based on who won.
fn adjust_ratings(ratings: Teams<&mut f64>, winner: usize) {
let exp_scores = expected_scores(&ratings);
ratings
.into_iter()
.zip(exp_scores.into_iter())
.enumerate()
.for_each(|(i, (es, exp_sc))| {
let len = es.len() as f64;
let score = f64::from(winner == i);
es.into_iter()
.for_each(|e| *e += 40.0 * (score - exp_sc) / len);
})
}
// Database Updating
pub fn add_players(
connection: &Connection,
dataset: &str,
teams: &Teams<PlayerData>,
) -> sqlite::Result<()> {
let query = format!(
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r#"INSERT OR IGNORE INTO "dataset_{}" VALUES (?, ?, ?, 1500)"#,
dataset
);
teams.iter().try_for_each(|team| {
team.iter().try_for_each(|PlayerData { id, name, prefix }| {
let mut statement = connection.prepare(&query)?;
statement.bind((1, id.0 as i64))?;
statement.bind((2, name.as_ref().map(|x| &x[..])))?;
statement.bind((3, prefix.as_ref().map(|x| &x[..])))?;
statement.into_iter().try_for_each(|x| x.map(|_| ()))
})
})
}
pub fn get_ratings(
connection: &Connection,
dataset: &str,
teams: &Teams<PlayerData>,
) -> sqlite::Result<Teams<(PlayerId, f64)>> {
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let query = format!(r#"SELECT id, elo FROM "dataset_{}" WHERE id = ?"#, dataset);
teams
.iter()
.map(|team| {
team.iter()
.map(|data| {
let mut statement = connection.prepare(&query)?;
statement.bind((1, data.id.0 as i64))?;
statement.next()?;
Ok((data.id, statement.read::<f64, _>("elo")?))
})
.try_collect()
})
.try_collect()
}
pub fn update_ratings(
connection: &Connection,
dataset: &str,
elos: Teams<(PlayerId, f64)>,
) -> sqlite::Result<()> {
let query = format!(
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r#"UPDATE "dataset_{}" SET elo = :elo WHERE id = :id"#,
dataset
);
elos.into_iter().try_for_each(|team| {
team.into_iter().try_for_each(|(id, elo)| {
let mut statement = connection.prepare(&query)?;
statement.bind((":elo", elo))?;
statement.bind((":id", id.0 as i64))?;
statement.into_iter().try_for_each(|x| x.map(|_| ()))
})
})
}
pub fn update_from_set(
connection: &Connection,
dataset: &str,
results: SetData,
) -> sqlite::Result<()> {
let players_data = results.teams;
add_players(connection, dataset, &players_data)?;
let mut elos = get_ratings(connection, dataset, &players_data)?;
adjust_ratings(
elos.iter_mut()
.map(|v| v.iter_mut().map(|x| &mut x.1).collect())
.collect(),
results.winner,
);
update_ratings(connection, dataset, elos)
}