//! Database Driver for SQLite
//!
//! Use of this driver requires enabling the `sqlite` feature.
//!
//! Contains database-specific query data
use super::*;

use slite::{params, Connection, Result};
use slite::NO_PARAMS;
use std::cell::RefCell;

/// The struct implementing the `DatabaseDriver` trait
#[derive(Debug)]
pub struct SQLiteDriver {
    connection: RefCell<Option<Connection>>
}

impl SQLiteDriver {
    /// Create an SQLiteDriver driver
    pub fn new(dsn: &str) -> Self {
        let mut driver = SQLiteDriver {
            connection: RefCell::new(None)
        };

        driver.connect(dsn);

        driver
    }

    fn connect(&mut self, dsn: &str) {
        let connection = if dsn == ":memory:" {
            Connection::open_in_memory().unwrap()
        } else {
            Connection::open(dsn).unwrap()
        };

        self.connection = RefCell::new(Some(connection));
    }

//    pub fn query(&self, sql: &str) -> Result<usize> {
//
//    }
}

impl DatabaseDriver for SQLiteDriver {
//    fn query(&self, sql: &str) -> Result<(), ()> {
//        unimplemented!();
//    }

    fn explain(&self, sql: &str) -> String {
        format!("EXPLAIN QUERY PLAN {}", sql)
    }

    fn random(&self) -> String {
        String::from(" RANDOM()")
    }
}