reifydb-sqlite 0.4.13

// SPDX-License-Identifier: Apache-2.0
// Copyright (c) 2025 ReifyDB

use rusqlite::{Connection, ToSql};

use crate::{
	SqliteConfig,
	error::{SqliteError, SqliteResult},
};

/// Apply the pragmas carried by `config` plus `auto_vacuum=INCREMENTAL` to `conn`.
/// Returns on the first failing pragma.
pub fn apply(conn: &Connection, config: &SqliteConfig) -> SqliteResult<()> {
	set(conn, "page_size", config.page_size)?;
	set(conn, "journal_mode", config.journal_mode.as_str())?;
	set(conn, "synchronous", config.synchronous_mode.as_str())?;
	set(conn, "temp_store", config.temp_store.as_str())?;
	set(conn, "auto_vacuum", "INCREMENTAL")?;
	set(conn, "cache_size", -(config.cache_size as i32))?;
	set(conn, "wal_autocheckpoint", config.wal_autocheckpoint)?;
	set(conn, "mmap_size", config.mmap_size as i64)?;
	Ok(())
}

/// Run `PRAGMA incremental_vacuum` to return freed pages to the OS.
pub fn incremental_vacuum(conn: &Connection) -> SqliteResult<()> {
	let statement = "PRAGMA incremental_vacuum";
	conn.execute(statement, []).map_err(|source| SqliteError::Execute {
		statement: statement.into(),
		source,
	})?;
	Ok(())
}

/// Release unused cache memory back to the allocator.
pub fn shrink_memory(conn: &Connection) -> SqliteResult<()> {
	set(conn, "shrink_memory", 0)
}

/// Explicitly checkpoint WAL and shrink the page cache.
pub fn shutdown(conn: &Connection) -> SqliteResult<()> {
	set(conn, "wal_checkpoint", "TRUNCATE")?;
	set(conn, "cache_size", 0)?;
	Ok(())
}

fn set<V: ToSql>(conn: &Connection, name: &str, value: V) -> SqliteResult<()> {
	conn.pragma_update(None, name, value).map_err(|source| SqliteError::Pragma {
		name: name.into(),
		source,
	})
}