//! The suite-driving test target: the SQLite engine's backlog column
//! (ADR-022's option (a) — the rows live in `alkstore-contract-suite`,
//! this target is the executor that runs them against the SQLite
//! factory; wave 5 runs the same rows against pg's).
//!
//! The factory: a fresh temp file under a fresh instance directory per
//! `open` (every call gets its own never-before-used path — the
//! isolation guarantee), teardown deleting the directory (idempotent —
//! already-deleted is already-torn-down, `Ok`). Close-arm rows drop
//! the store handle (the dispose carrier) — deleting files under a
//! live store is not a close mechanism.

use std::path::PathBuf;
use std::sync::atomic::{AtomicU64, Ordering};

use alkstore::{BoxedFuture, Error, Result, Store};
use alkstore_contract_suite::StoreFactory;
use alkstore_sqlite::open;

/// The SQLite suite factory: fresh temp-file store per `open`,
/// idempotent directory-delete teardown. `Send + Sync` — instance
/// state is a path prefix and a counter.
struct SqliteFactory {
    dir: PathBuf,
    instance: AtomicU64,
}

impl SqliteFactory {
    fn new(tag: &str) -> Self {
        let dir = std::env::temp_dir().join(format!(
            "alkstore-suite-{tag}-{}-{:?}",
            std::process::id(),
            std::thread::current().id()
        ));
        let _ = std::fs::remove_dir_all(&dir);
        std::fs::create_dir_all(&dir).unwrap();
        SqliteFactory {
            dir,
            instance: AtomicU64::new(0),
        }
    }
}

impl StoreFactory for SqliteFactory {
    fn open(&self) -> BoxedFuture<'_, Result<Box<dyn Store>>> {
        let n = self.instance.fetch_add(1, Ordering::SeqCst);
        let path = self
            .dir
            .join(format!("store-{n}.db"))
            .to_str()
            .unwrap_or_default()
            .to_string();
        Box::pin(async move { open(&path, Default::default()) })
    }

    fn teardown(&self) -> BoxedFuture<'_, Result<()>> {
        let dir = self.dir.clone();
        Box::pin(async move {
            match std::fs::remove_dir_all(&dir) {
                Ok(()) => Ok(()),
                Err(e) if e.kind() == std::io::ErrorKind::NotFound => Ok(()),
                Err(e) => Err(Error::database(e)),
            }
        })
    }
}

mod rows {
    use alkstore_contract_suite::properties::{
        drop_rollback_leaves_no_ghosts, duration_refusal_on_non_positive_ttl,
        enqueue_opts_resolution, extent_clamp_semantics, in_tx_reads_see_own_writes,
        name_validation_rejects_empty_and_reserved, payload_round_trip_stores_exact_encoding,
        payload_too_large_never_produced_on_sqlite, receiver_close_and_save_arms,
    };

    use super::SqliteFactory;

    fn factory(tag: &str) -> SqliteFactory {
        SqliteFactory::new(tag)
    }

    #[tokio::test(flavor = "multi_thread")]
    async fn row_name_validation_rejects_empty_and_reserved() {
        name_validation_rejects_empty_and_reserved(&factory("row-name-validation")).await;
    }

    #[tokio::test(flavor = "multi_thread")]
    async fn row_extent_clamp_semantics() {
        extent_clamp_semantics(&factory("row-extent-clamp")).await;
    }

    #[tokio::test(flavor = "multi_thread")]
    async fn row_duration_refusal_on_non_positive_ttl() {
        duration_refusal_on_non_positive_ttl(&factory("row-duration-refusal")).await;
    }

    #[tokio::test(flavor = "multi_thread")]
    async fn row_payload_round_trip_stores_exact_encoding() {
        payload_round_trip_stores_exact_encoding(&factory("row-payload-round-trip")).await;
    }

    #[tokio::test(flavor = "multi_thread")]
    async fn row_payload_too_large_never_produced_on_sqlite() {
        payload_too_large_never_produced_on_sqlite(&factory("row-no-too-large")).await;
    }

    #[tokio::test(flavor = "multi_thread")]
    async fn row_drop_rollback_leaves_no_ghosts() {
        drop_rollback_leaves_no_ghosts(&factory("row-drop-rollback")).await;
    }

    #[tokio::test(flavor = "multi_thread")]
    async fn row_in_tx_reads_see_own_writes() {
        in_tx_reads_see_own_writes(&factory("row-in-tx-ryow")).await;
    }

    #[tokio::test(flavor = "multi_thread")]
    async fn row_enqueue_opts_resolution() {
        enqueue_opts_resolution(&factory("row-opts-resolution")).await;
    }

    #[tokio::test(flavor = "multi_thread")]
    async fn row_receiver_close_and_save_arms() {
        receiver_close_and_save_arms(&factory("row-receiver-arms")).await;
    }
}

mod factory_shape {
    use super::SqliteFactory;
    use alkstore_contract_suite::StoreFactory;

    /// ADR-022's factory contract: every open yield is isolated (no two
    /// opens share rows) and teardown is idempotent per instance; a
    /// failing assertion early-exit (the panic path) leaves teardown
    /// safe against the abandoned store (the documented open/close/
    /// delete order is safe at any point — the row pins the
    /// teardown-side half).
    #[tokio::test(flavor = "multi_thread")]
    async fn opens_are_isolated_and_teardown_is_idempotent() {
        let factory = SqliteFactory::new("factory-shape");

        let a = factory.open().await.unwrap();
        let b = factory.open().await.unwrap();

        factory.teardown().await.unwrap();
        factory.teardown().await.unwrap();

        drop(a);
        drop(b);
        assert!(!factory.dir.exists(), "teardown removed the backing dir");
    }
}