//! The local-first core: an on-device SQLite store + Tauri commands implementing the
//! frontend's repository seam, so the desktop app is fully usable with no server and
//! no login. adapters/local.ts (M10.5) calls into `commands`.

pub mod commands;
pub mod derive;
pub mod models;
pub mod retention;
pub mod schema;
pub mod store;

use std::path::Path;
use std::sync::Mutex;

use rusqlite::Connection;

/// The shared database handle, held in Tauri's managed state. rusqlite connections
/// aren't `Sync`, so a `Mutex` serializes access (fine — operations are quick and the
/// UI is single-user).
pub struct Db(pub Mutex<Connection>);

/// Open (creating if needed) the database at `path` and bring it to the latest schema.
pub fn open(path: &Path) -> rusqlite::Result<Db> {
    let conn = Connection::open(path)?;
    schema::migrate(&conn)?;
    Ok(Db(Mutex::new(conn)))
}

/// A one-line count summary of the store, for the startup log.
pub fn summary(db: &Db) -> String {
    let conn = match db.0.lock() {
        Ok(c) => c,
        Err(_) => return "counts unavailable (lock poisoned)".to_string(),
    };
    let count = |sql: &str| {
        conn.query_row(sql, [], |r| r.get::<_, i64>(0))
            .unwrap_or(-1)
    };
    format!(
        "{} notes, {} labels",
        count("SELECT COUNT(*) FROM notes"),
        count("SELECT COUNT(*) FROM labels"),
    )
}