// This file is part of Moonfire NVR, a security camera network video recorder.
// Copyright (C) 2016-2020 The Moonfire NVR Authors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// In addition, as a special exception, the copyright holders give
// permission to link the code of portions of this program with the
// OpenSSL library under certain conditions as described in each
// individual source file, and distribute linked combinations including
// the two.
//
// You must obey the GNU General Public License in all respects for all
// of the code used other than OpenSSL. If you modify file(s) with this
// exception, you may extend this exception to your version of the
// file(s), but you are not obligated to do so. If you do not wish to do
// so, delete this exception statement from your version. If you delete
// this exception statement from all source files in the program, then
// also delete it here.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

use failure::Error;
use log::info;
use structopt::StructOpt;
use std::path::PathBuf;

#[derive(StructOpt)]
pub struct Args {
    /// Directory holding the SQLite3 index database.
    #[structopt(long, default_value = "/var/lib/moonfire-nvr/db", value_name="path",
                parse(from_os_str))]
    db_dir: PathBuf,
}

pub fn run(args: &Args) -> Result<(), Error> {
    let (_db_dir, mut conn) = super::open_conn(&args.db_dir, super::OpenMode::Create)?;

    // Check if the database has already been initialized.
    let cur_ver = db::get_schema_version(&conn)?;
    if let Some(v) = cur_ver {
        info!("Database is already initialized with schema version {}.", v);
        return Ok(());
    }

    // Use WAL mode (which is the most efficient way to preserve database integrity) with a large
    // page size (so reading large recording_playback rows doesn't require as many seeks). Changing
    // the page size requires doing a vacuum in non-WAL mode. This will be cheap on an empty
    // database. https://www.sqlite.org/pragma.html#pragma_page_size
    conn.execute_batch(r#"
        pragma journal_mode = delete;
        pragma page_size = 16384;
        vacuum;
        pragma journal_mode = wal;
    "#)?;
    db::init(&mut conn)?;
    info!("Database initialized.");
    Ok(())
}