//! SQLite through `sqlx` (hub spec §3.1, §17.2): WAL, foreign keys on,

//! migrations embedded and applied at start. One module per table group.

pub mod accounts;

pub mod activity;

pub mod flow;

pub mod hooks;

pub mod issues;

pub mod notify;

pub mod projects;

pub mod proposals;

pub mod releases;

pub mod repos;

use sqlx::sqlite::{SqliteConnectOptions, SqliteJournalMode, SqlitePoolOptions, SqliteSynchronous};

use sqlx::SqlitePool;

use std::path::Path;

pub type Pool = SqlitePool;

/// Open (creating if needed) and migrate the database at `path`.

pub async fn open(path: &Path) -> anyhow::Result<Pool> {

    let options = SqliteConnectOptions::new()

        .filename(path)

        .create_if_missing(true)

        .journal_mode(SqliteJournalMode::Wal)

        .synchronous(SqliteSynchronous::Normal)

        .foreign_keys(true)

        .busy_timeout(std::time::Duration::from_secs(5));

    let pool = SqlitePoolOptions::new().max_connections(8).connect_with(options).await?;

    sqlx::migrate!("./migrations").run(&pool).await?;

    Ok(pool)

}

/// Milliseconds since the epoch, the hub's timestamp unit (as `oxy`'s).

pub fn now_ms() -> i64 {

    std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).map(|d| d.as_millis() as i64).unwrap_or(0)

}

/// A write transaction that takes SQLite's write lock at `BEGIN`

/// (`BEGIN IMMEDIATE`). A deferred transaction that reads and then writes

/// fails at once with "database is locked" when another writer holds the

/// lock, whatever the busy timeout; an immediate one waits its turn.

pub async fn begin_write(pool: &Pool) -> sqlx::Result<sqlx::Transaction<'static, sqlx::Sqlite>> {

    pool.begin_with("BEGIN IMMEDIATE").await

}