//! An _ordered_ variant of a [crate::qmdb::current] authenticated database for variable-size values
//!
//! This variant maintains the lexicographic-next active key for each active key, enabling exclusion
//! proofs (proving a key is currently inactive). Use [crate::qmdb::current::unordered::variable] if
//! exclusion proofs are not needed.
//!
//! See [Db] for the main database type and
//! [ExclusionProof](super::proof::constant::ExclusionProof) for proving key inactivity.

use crate::{
    Context,
    index::ordered::Index,
    journal::contiguous::variable::Journal,
    merkle::{Graftable, Location},
    qmdb::{
        Error,
        any::{VariableValue, ordered::variable::Operation, value::VariableEncoding},
        current::VariableConfig as Config,
        operation::Key,
    },
    translator::OrderedTranslator,
};
use commonware_codec::Read;
use commonware_cryptography::Hasher;
use commonware_parallel::Strategy;
use commonware_runtime::Spawner;

pub type Db<F, E, K, V, H, T, const N: usize, S> = super::db::Db<
    F,
    E,
    Journal<E, Operation<F, K, V>>,
    K,
    VariableEncoding<V>,
    Index<T, Location<F>>,
    H,
    N,
    S,
>;

impl<
    F: Graftable,
    E: Context + Spawner,
    K: Key,
    V: VariableValue,
    H: Hasher,
    T: OrderedTranslator,
    const N: usize,
    S: Strategy,
> Db<F, E, K, V, H, T, N, S>
{
    /// Initializes a [Db] from the given `config`.
    /// The configured [`Strategy`] is used to parallelize merkleization.
    /// `Some(max_size)` selects the latest retained commit with at most `max_size` operations,
    /// while `None` selects the latest retained state. Initialization fails with
    /// [Error::HistoricalFloorPruned] if the log or bitmap has pruned the commit's inactivity floor,
    /// and with [Error::Journal] ([`crate::journal::Error::ItemPruned`]) if the selected commit
    /// itself has been pruned.
    pub async fn init(
        context: E,
        config: Config<T, <Operation<F, K, V> as Read>::Cfg, S>,
        max_size: Option<Location<F>>,
    ) -> Result<Self, Error<F>> {
        crate::qmdb::current::init(context, config, max_size).await
    }
}

pub mod partitioned {
    //! A variant of [super] that uses a partitioned index for the snapshot.

    use super::*;
    use crate::index::partitioned::ordered::Index;

    /// A partitioned variant of [super::Db].
    ///
    /// The const generic `P` specifies the number of prefix bytes used for partitioning:
    /// - `P = 1`: 256 partitions
    /// - `P = 2`: 65,536 partitions
    /// - `P = 3`: ~16 million partitions
    pub type Db<F, E, K, V, H, T, const P: usize, const N: usize, S> =
        crate::qmdb::current::ordered::db::Db<
            F,
            E,
            Journal<E, Operation<F, K, V>>,
            K,
            VariableEncoding<V>,
            Index<T, Location<F>, P>,
            H,
            N,
            S,
        >;

    impl<
        F: Graftable,
        E: Context + Spawner,
        K: Key,
        V: VariableValue,
        H: Hasher,
        T: OrderedTranslator,
        const P: usize,
        const N: usize,
        S: Strategy,
    > Db<F, E, K, V, H, T, P, N, S>
    {
        /// Initializes a [Db] from the given `config`.
        /// `Some(max_size)` selects the latest retained commit with at most `max_size` operations,
        /// while `None` selects the latest retained state. Initialization fails with
        /// [Error::HistoricalFloorPruned] if the log or bitmap has pruned the commit's inactivity
        /// floor, and with [Error::Journal] ([`crate::journal::Error::ItemPruned`]) if the selected
        /// commit itself has been pruned.
        pub async fn init(
            context: E,
            config: Config<T, <Operation<F, K, V> as Read>::Cfg, S, core::num::NonZeroUsize>,
            max_size: Option<Location<F>>,
        ) -> Result<Self, Error<F>> {
            crate::qmdb::current::init(context, config, max_size).await
        }
    }
}

#[cfg(test)]
mod test {
    use crate::{
        merkle::Graftable,
        mmb, mmr,
        qmdb::current::{ordered::tests as shared, tests::variable_config},
        translator::OneCap,
    };
    use commonware_cryptography::{Sha256, sha256::Digest};
    use commonware_macros::test_traced;
    use commonware_runtime::deterministic;

    /// A type alias for the concrete [Db] type used in these unit tests.
    type CurrentTest<F = mmr::Family> = super::Db<
        F,
        deterministic::Context,
        Digest,
        Digest,
        Sha256,
        OneCap,
        32,
        commonware_parallel::Sequential,
    >;

    /// Return a [Db] database initialized with a variable config.
    async fn open_db<F: Graftable>(
        context: deterministic::Context,
        partition_prefix: String,
    ) -> CurrentTest<F> {
        let cfg = variable_config::<OneCap>(&partition_prefix);
        CurrentTest::<F>::init(context, cfg, None).await.unwrap()
    }

    #[test_traced("DEBUG")]
    pub fn test_current_db_verify_proof_over_bits_in_uncommitted_chunk() {
        shared::test_verify_proof_over_bits_in_uncommitted_chunk(open_db::<mmr::Family>);
    }

    #[test_traced("DEBUG")]
    pub fn test_current_db_range_proofs() {
        shared::test_range_proofs(open_db::<mmr::Family>);
    }

    #[test_traced("DEBUG")]
    pub fn test_current_db_key_value_proof() {
        shared::test_key_value_proof(open_db::<mmr::Family>);
    }

    #[test_traced("DEBUG")]
    fn test_current_db_dynamic_key_value_proof_mmb() {
        shared::test_key_value_proof(open_db::<mmb::Family>);
    }

    #[test_traced("DEBUG")]
    fn test_current_db_dynamic_exclusion_proofs_mmb() {
        shared::test_exclusion_proofs(open_db::<mmb::Family>);
    }

    #[test_traced("DEBUG")]
    fn test_current_db_dynamic_inactive_proof_mmb() {
        shared::test_verify_proof_over_bits_in_uncommitted_chunk(open_db::<mmb::Family>);
    }

    #[test_traced("WARN")]
    pub fn test_current_db_proving_repeated_updates() {
        shared::test_proving_repeated_updates(open_db::<mmr::Family>);
    }

    #[test_traced("DEBUG")]
    pub fn test_current_db_exclusion_proofs() {
        shared::test_exclusion_proofs(open_db::<mmr::Family>);
    }
}