use rusqlite::Connection;

pub fn init_db() -> Connection {
    let conn = Connection::open("client.db").unwrap();
    conn.execute(
        "CREATE TABLE IF NOT EXISTS hosts (
            host TEXT PRIMARY KEY,
            last_used DATETIME DEFAULT CURRENT_TIMESTAMP
        )",
        [],
    ).unwrap();
    conn.execute(
        "CREATE TABLE IF NOT EXISTS credentials (
            host TEXT PRIMARY KEY,
            username TEXT NOT NULL,
            password TEXT NOT NULL
        )",
        [],
    ).unwrap();
    conn
}

pub fn get_last_host(conn: &Connection) -> Option<String> {
    let mut stmt = conn.prepare("SELECT host FROM hosts ORDER BY last_used DESC LIMIT 1").unwrap();
    let mut rows = stmt.query([]).unwrap();
    if let Ok(Some(row)) = rows.next() {
        row.get(0).ok()
    } else {
        None
    }
}

pub fn save_host(conn: &Connection, host: &str) {
    conn.execute(
        "INSERT OR REPLACE INTO hosts (host, last_used) VALUES (?1, CURRENT_TIMESTAMP)",
        [host],
    ).unwrap();
}

pub fn save_credentials(conn: &Connection, host: &str, username: &str, password: &str) -> Result<(), Box<dyn std::error::Error>> {
    conn.execute(
        "INSERT OR REPLACE INTO credentials (host, username, password) VALUES (?1, ?2, ?3)",
        (host, username, password),
    )?;
    Ok(())
}

pub fn get_credentials(conn: &Connection, host: &str) -> Option<(String, String)> {
    let mut stmt = conn.prepare("SELECT username, password FROM credentials WHERE host = ?1").unwrap();
    let mut rows = stmt.query([host]).unwrap();
    if let Ok(Some(row)) = rows.next() {
        let username: String = row.get(0).unwrap();
        let password: String = row.get(1).unwrap();
        Some((username, password))
    } else {
        None
    }
}