// file: kb_lib/src/dex_decoded_event_materialization.rs

//! Decoded DEX event materialization helpers.
//!
//! This module centralizes persistence of decoded DEX events:
//! payload enrichment, upsert, fetch-after-upsert, observation recording
//! and signal recording.

/// Input required to persist one decoded DEX event.
pub(crate) struct DexDecodedEventMaterializationInput<'a> {
    /// Database connection.
    pub(crate) database: &'a crate::Database,
    /// Detection persistence service.
    pub(crate) persistence: &'a crate::DetectionPersistenceService,
    /// Parent transaction.
    pub(crate) transaction: &'a crate::ChainTransactionDto,
    /// Internal transaction id.
    pub(crate) transaction_id: i64,
    /// Optional internal instruction id.
    pub(crate) instruction_id: std::option::Option<i64>,
    /// Stable protocol name.
    pub(crate) protocol_name: std::string::String,
    /// Program id that produced the event.
    pub(crate) program_id: std::string::String,
    /// Stable decoded event kind.
    pub(crate) event_kind: std::string::String,
    /// Optional pool account.
    pub(crate) pool_account: std::option::Option<std::string::String>,
    /// Optional market account.
    pub(crate) market_account: std::option::Option<std::string::String>,
    /// Optional token A mint.
    pub(crate) token_a_mint: std::option::Option<std::string::String>,
    /// Optional token B mint.
    pub(crate) token_b_mint: std::option::Option<std::string::String>,
    /// Optional LP mint or protocol-specific secondary mint.
    pub(crate) lp_mint: std::option::Option<std::string::String>,
    /// Payload used for classification enrichment and DB storage.
    pub(crate) enrichment_payload_json: serde_json::Value,
    /// Payload recorded in the detection observation.
    pub(crate) observation_payload_json: serde_json::Value,
    /// Detection observation kind.
    pub(crate) observation_kind: std::string::String,
    /// Detection signal kind.
    pub(crate) signal_kind: std::string::String,
    /// Diagnostic message emitted when fetch-after-upsert fails.
    pub(crate) missing_after_upsert_message: std::string::String,
}

/// Persists one decoded DEX event and records its first-seen observation/signal.
pub(crate) async fn materialize_dex_decoded_event(
    input: crate::dex_decoded_event_materialization::DexDecodedEventMaterializationInput<'_>,
) -> Result<crate::DexDecodedEventDto, crate::Error> {
    let payload_json_result = crate::enrich_and_serialize_dex_decoded_payload(
        input.protocol_name.as_str(),
        input.event_kind.as_str(),
        input.enrichment_payload_json,
    );
    let payload_json = match payload_json_result {
        Ok(payload_json) => payload_json,
        Err(error) => return Err(error),
    };
    let existing_result = crate::query_dex_decoded_events_get_by_key(
        input.database,
        input.transaction_id,
        input.instruction_id,
        input.event_kind.as_str(),
    )
    .await;
    let existing_option = match existing_result {
        Ok(existing_option) => existing_option,
        Err(error) => return Err(error),
    };
    let already_present = existing_option.is_some();
    let dto = crate::DexDecodedEventDto::new(
        input.transaction_id,
        input.instruction_id,
        input.protocol_name,
        input.program_id,
        input.event_kind.clone(),
        input.pool_account,
        input.market_account,
        input.token_a_mint,
        input.token_b_mint,
        input.lp_mint,
        payload_json,
    );
    let upsert_result = crate::query_dex_decoded_events_upsert(input.database, &dto).await;
    if let Err(error) = upsert_result {
        return Err(error);
    }
    let fetched_result = crate::query_dex_decoded_events_get_by_key(
        input.database,
        input.transaction_id,
        input.instruction_id,
        input.event_kind.as_str(),
    )
    .await;
    let fetched_option = match fetched_result {
        Ok(fetched_option) => fetched_option,
        Err(error) => return Err(error),
    };
    let fetched = match fetched_option {
        Some(fetched) => fetched,
        None => {
            return Err(crate::Error::InvalidState(input.missing_after_upsert_message));
        },
    };
    if !already_present {
        let observation_result = input
            .persistence
            .record_observation(&crate::DetectionObservationInput::new(
                input.observation_kind,
                crate::ObservationSourceKind::HttpRpc,
                input.transaction.source_endpoint_name.clone(),
                input.transaction.signature.clone(),
                input.transaction.slot,
                input.observation_payload_json.clone(),
            ))
            .await;
        let observation_id = match observation_result {
            Ok(observation_id) => observation_id,
            Err(error) => return Err(error),
        };
        let signal_result = input
            .persistence
            .record_signal(&crate::DetectionSignalInput::new(
                input.signal_kind,
                crate::AnalysisSignalSeverity::Low,
                input.transaction.signature.clone(),
                Some(observation_id),
                None,
                input.observation_payload_json,
            ))
            .await;
        if let Err(error) = signal_result {
            return Err(error);
        }
    }
    return Ok(fetched);
}