// file: kb_lib/src/db/dtos/trade_event.rs

//! Trade-event DTO.

/// Application-facing trade-event DTO.
#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
pub struct TradeEventDto {
    /// Optional numeric primary key.
    pub id: std::option::Option<i64>,
    /// Related DEX id.
    pub dex_id: i64,
    /// Related pool id.
    pub pool_id: i64,
    /// Related pair id.
    pub pair_id: i64,
    /// Related transaction id.
    pub transaction_id: i64,
    /// Related decoded event id.
    pub decoded_event_id: i64,
    /// Related transaction signature.
    pub signature: std::string::String,
    /// Optional observed slot.
    pub slot: std::option::Option<i64>,
    /// Stable trade side.
    pub trade_side: crate::SwapTradeSide,
    /// Related base token id.
    pub base_token_id: i64,
    /// Related quote token id.
    pub quote_token_id: i64,
    /// Optional raw base amount.
    pub base_amount_raw: std::option::Option<std::string::String>,
    /// Optional raw quote amount.
    pub quote_amount_raw: std::option::Option<std::string::String>,
    /// Optional derived quote-per-base price.
    pub price_quote_per_base: std::option::Option<f64>,
    /// Observation source kind.
    pub source_kind: crate::ObservationSourceKind,
    /// Optional logical source endpoint name.
    pub source_endpoint_name: std::option::Option<std::string::String>,
    /// Persisted payload JSON.
    pub payload_json: std::string::String,
    /// Creation timestamp.
    pub created_at: chrono::DateTime<chrono::Utc>,
    /// Update timestamp.
    pub updated_at: chrono::DateTime<chrono::Utc>,
}

impl TradeEventDto {
    /// Creates a new trade-event DTO.
    pub fn new(
        dex_id: i64,
        pool_id: i64,
        pair_id: i64,
        transaction_id: i64,
        decoded_event_id: i64,
        signature: std::string::String,
        slot: std::option::Option<i64>,
        trade_side: crate::SwapTradeSide,
        base_token_id: i64,
        quote_token_id: i64,
        base_amount_raw: std::option::Option<std::string::String>,
        quote_amount_raw: std::option::Option<std::string::String>,
        price_quote_per_base: std::option::Option<f64>,
        source_kind: crate::ObservationSourceKind,
        source_endpoint_name: std::option::Option<std::string::String>,
        payload_json: std::string::String,
    ) -> Self {
        let now = chrono::Utc::now();
        return Self {
            id: None,
            dex_id,
            pool_id,
            pair_id,
            transaction_id,
            decoded_event_id,
            signature,
            slot,
            trade_side,
            base_token_id,
            quote_token_id,
            base_amount_raw,
            quote_amount_raw,
            price_quote_per_base,
            source_kind,
            source_endpoint_name,
            payload_json,
            created_at: now,
            updated_at: now,
        };
    }
}

impl TryFrom<crate::TradeEventEntity> for TradeEventDto {
    type Error = crate::Error;

    fn try_from(entity: crate::TradeEventEntity) -> Result<Self, Self::Error> {
        let trade_side = trade_side_from_string(entity.trade_side.as_str());
        let source_kind_result = crate::ObservationSourceKind::from_i16(entity.source_kind);
        let source_kind = match source_kind_result {
            Ok(source_kind) => source_kind,
            Err(error) => return Err(error),
        };
        let created_at_result = chrono::DateTime::parse_from_rfc3339(&entity.created_at);
        let created_at = match created_at_result {
            Ok(created_at) => created_at.with_timezone(&chrono::Utc),
            Err(error) => {
                return Err(crate::Error::Db(format!(
                    "cannot parse trade_event created_at '{}': {}",
                    entity.created_at, error
                )));
            },
        };
        let updated_at_result = chrono::DateTime::parse_from_rfc3339(&entity.updated_at);
        let updated_at = match updated_at_result {
            Ok(updated_at) => updated_at.with_timezone(&chrono::Utc),
            Err(error) => {
                return Err(crate::Error::Db(format!(
                    "cannot parse trade_event updated_at '{}': {}",
                    entity.updated_at, error
                )));
            },
        };
        return Ok(Self {
            id: Some(entity.id),
            dex_id: entity.dex_id,
            pool_id: entity.pool_id,
            pair_id: entity.pair_id,
            transaction_id: entity.transaction_id,
            decoded_event_id: entity.decoded_event_id,
            signature: entity.signature,
            slot: entity.slot,
            trade_side,
            base_token_id: entity.base_token_id,
            quote_token_id: entity.quote_token_id,
            base_amount_raw: entity.base_amount_raw,
            quote_amount_raw: entity.quote_amount_raw,
            price_quote_per_base: entity.price_quote_per_base,
            source_kind,
            source_endpoint_name: entity.source_endpoint_name,
            payload_json: entity.payload_json,
            created_at,
            updated_at,
        });
    }
}

fn trade_side_from_string(value: &str) -> crate::SwapTradeSide {
    match value {
        "BuyBase" => return crate::SwapTradeSide::BuyBase,
        "SellBase" => return crate::SwapTradeSide::SellBase,
        _ => return crate::SwapTradeSide::Unknown,
    }
}