// file: crates/ksp-onchain-transport-lib/src/ws_blocks.rs
// version: 2

/// Filter accepted by unstable Solana `blockSubscribe`.
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum SolanaBlockSubscribeFilter {
    /// Subscribe to every block that reaches the configured commitment.
    All,
    /// Subscribe only to blocks containing a transaction that mentions the account or program.
    MentionsAccountOrProgram(ksp_core_lib::Pubkey),
}

impl SolanaBlockSubscribeFilter {
    fn to_json_value(&self) -> serde_json::Value {
        return match self {
            Self::All => serde_json::Value::String("all".to_owned()),
            Self::MentionsAccountOrProgram(pubkey) => serde_json::json!({"mentionsAccountOrProgram": pubkey.to_string()}),
        };
    }
}

/// Optional configuration accepted by unstable Solana `blockSubscribe`.
#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
pub struct SolanaBlockSubscribeConfig {
    commitment: std::option::Option<crate::SolanaCommitment>,
    encoding: std::option::Option<crate::SolanaTransactionEncoding>,
    transaction_details: std::option::Option<crate::SolanaTransactionDetails>,
    max_supported_transaction_version: std::option::Option<u8>,
    show_rewards: std::option::Option<bool>,
}

impl SolanaBlockSubscribeConfig {
    /// Creates an explicit unstable block-subscription configuration.
    #[must_use]
    pub const fn new(
        commitment: std::option::Option<crate::SolanaCommitment>,
        encoding: std::option::Option<crate::SolanaTransactionEncoding>,
        transaction_details: std::option::Option<crate::SolanaTransactionDetails>,
        max_supported_transaction_version: std::option::Option<u8>,
        show_rewards: std::option::Option<bool>,
    ) -> Self {
        return Self { commitment, encoding, transaction_details, max_supported_transaction_version, show_rewards };
    }

    /// Returns the optional commitment level.
    #[must_use]
    pub const fn commitment(&self) -> std::option::Option<crate::SolanaCommitment> {
        return self.commitment;
    }

    /// Returns the optional transaction encoding.
    #[must_use]
    pub const fn encoding(&self) -> std::option::Option<crate::SolanaTransactionEncoding> {
        return self.encoding;
    }

    /// Returns the optional transaction detail level.
    #[must_use]
    pub const fn transaction_details(&self) -> std::option::Option<crate::SolanaTransactionDetails> {
        return self.transaction_details;
    }

    /// Returns the highest transaction version the caller declares it can consume.
    #[must_use]
    pub const fn max_supported_transaction_version(&self) -> std::option::Option<u8> {
        return self.max_supported_transaction_version;
    }

    /// Returns whether rewards were explicitly requested for block notifications.
    #[must_use]
    pub const fn show_rewards(&self) -> std::option::Option<bool> {
        return self.show_rewards;
    }

    fn is_empty(&self) -> bool {
        return self.commitment.is_none()
            && self.encoding.is_none()
            && self.transaction_details.is_none()
            && self.max_supported_transaction_version.is_none()
            && self.show_rewards.is_none();
    }

    fn validate(&self) -> ksp_core_lib::Result<()> {
        if self.commitment == std::option::Option::Some(crate::SolanaCommitment::Processed) {
            return std::result::Result::Err(
                ksp_core_lib::Error::new(
                    crate::ERROR_CODE_INVALID_RPC_PARAMETERS,
                    "blockSubscribe commitment must be confirmed or finalized when explicitly provided",
                )
                .with_context("rpc_method", "blockSubscribe")
                .with_context("commitment", "processed"),
            );
        }
        return std::result::Result::Ok(());
    }

    fn to_json_value(self) -> serde_json::Value {
        let mut object = serde_json::Map::new();
        if let std::option::Option::Some(commitment) = self.commitment {
            object.insert("commitment".to_owned(), serde_json::Value::String(commitment.as_str().to_owned()));
        }
        if let std::option::Option::Some(encoding) = self.encoding {
            object.insert("encoding".to_owned(), serde_json::Value::String(encoding.as_str().to_owned()));
        }
        if let std::option::Option::Some(transaction_details) = self.transaction_details {
            object.insert("transactionDetails".to_owned(), serde_json::Value::String(transaction_details.as_str().to_owned()));
        }
        if let std::option::Option::Some(version) = self.max_supported_transaction_version {
            object.insert("maxSupportedTransactionVersion".to_owned(), serde_json::Value::Number(version.into()));
        }
        if let std::option::Option::Some(show_rewards) = self.show_rewards {
            object.insert("showRewards".to_owned(), serde_json::Value::Bool(show_rewards));
        }
        return serde_json::Value::Object(object);
    }
}

/// Typed value carried inside an unstable Solana `blockNotification` response.
#[derive(Clone, Debug, PartialEq)]
pub struct SolanaBlockNotification {
    slot: u64,
    block: std::option::Option<crate::SolanaConfirmedBlock>,
    err: std::option::Option<serde_json::Value>,
}

impl SolanaBlockNotification {
    /// Returns the slot associated with this block update.
    #[must_use]
    pub const fn slot(&self) -> u64 {
        return self.slot;
    }

    /// Returns the decoded block when the unstable notification contains one.
    #[must_use]
    pub const fn block(&self) -> std::option::Option<&crate::SolanaConfirmedBlock> {
        return self.block.as_ref();
    }

    /// Returns the nullable publication error without interpreting its unstable wire shape.
    #[must_use]
    pub const fn err(&self) -> std::option::Option<&serde_json::Value> {
        return self.err.as_ref();
    }
}

impl crate::WsSession {
    /// Subscribes to unstable standard Solana block notifications through `blockSubscribe`.
    ///
    /// Solana documents this method as unstable and requires validator-side block-subscription support. KSP emits a warning through its logging facade when
    /// this family is requested. An explicitly supplied commitment must be `confirmed` or `finalized`.
    pub async fn block_subscribe(
        &self,
        filter: &crate::SolanaBlockSubscribeFilter,
        config: std::option::Option<&crate::SolanaBlockSubscribeConfig>,
    ) -> ksp_core_lib::Result<crate::WsSubscription<crate::SolanaRpcResponse<crate::SolanaBlockNotification>>> {
        if let std::option::Option::Some(config) = config {
            let validated = config.validate();
            if let std::result::Result::Err(error) = validated {
                return std::result::Result::Err(error);
            }
        }
        let mut params = std::vec![filter.to_json_value()];
        if let std::option::Option::Some(config) = config
            && !config.is_empty()
        {
            params.push((*config).to_json_value());
        }
        return self.subscribe_typed(crate::WsSubscriptionKind::Block, params, |value| return decode_block_notification("blockSubscribe", value)).await;
    }
}

#[derive(serde::Deserialize)]
struct WireBlockNotification {
    slot: u64,
    block: std::option::Option<serde_json::Value>,
    err: serde_json::Value,
}

fn decode_block_notification(method: &str, value: serde_json::Value) -> ksp_core_lib::Result<crate::SolanaRpcResponse<crate::SolanaBlockNotification>> {
    let decoded = crate::decode_wire_json::<WireRpcResponse>(method, value);
    let wire = match decoded {
        std::result::Result::Ok(wire) => wire,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let context = crate::SolanaRpcContext::decode_wire(method, wire.context);
    let context = match context {
        std::result::Result::Ok(context) => context,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let block = match wire.value.block {
        std::option::Option::Some(value) => {
            let decoded = crate::SolanaConfirmedBlock::decode_wire(method, value);
            match decoded {
                std::result::Result::Ok(block) => std::option::Option::Some(block),
                std::result::Result::Err(error) => return std::result::Result::Err(error),
            }
        },
        std::option::Option::None => std::option::Option::None,
    };
    let err = match wire.value.err {
        serde_json::Value::Null => std::option::Option::None,
        value => std::option::Option::Some(value),
    };
    return std::result::Result::Ok(crate::SolanaRpcResponse::new(context, crate::SolanaBlockNotification { slot: wire.value.slot, block, err }));
}

#[derive(serde::Deserialize)]
struct WireRpcResponse {
    context: serde_json::Value,
    value: WireBlockNotification,
}

impl crate::SolanaStandardWsSession {
    /// Subscribes to unstable standard Solana block notifications through `blockSubscribe`.
    pub async fn block_subscribe(
        &self,
        filter: &crate::SolanaBlockSubscribeFilter,
        config: std::option::Option<&crate::SolanaBlockSubscribeConfig>,
    ) -> ksp_core_lib::Result<crate::WsSubscription<crate::SolanaRpcResponse<crate::SolanaBlockNotification>>> {
        return self.physical_session().block_subscribe(filter, config).await;
    }
}

#[cfg(test)]
#[path = "../unit_tests/ws_blocks.rs"]
mod tests;