// file: kb_lib/src/db/queries/pair_metric.rs

//! Queries for `kb_pair_metrics`.

/// Inserts or updates one pair-metric row and returns its stable internal id.
pub async fn upsert_pair_metric(
    database: &crate::KbDatabase,
    dto: &crate::KbPairMetricDto,
) -> Result<i64, crate::KbError> {
    match database.connection() {
        crate::KbDatabaseConnection::Sqlite(pool) => {
            let query_result = sqlx::query(
                r#"
INSERT INTO kb_pair_metrics (
    pair_id,
    first_slot,
    last_slot,
    first_signature,
    last_signature,
    trade_count,
    buy_count,
    sell_count,
    cumulative_base_amount_raw,
    cumulative_quote_amount_raw,
    last_price_quote_per_base,
    created_at,
    updated_at
)
VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
ON CONFLICT(pair_id) DO UPDATE SET
    first_slot = excluded.first_slot,
    last_slot = excluded.last_slot,
    first_signature = excluded.first_signature,
    last_signature = excluded.last_signature,
    trade_count = excluded.trade_count,
    buy_count = excluded.buy_count,
    sell_count = excluded.sell_count,
    cumulative_base_amount_raw = excluded.cumulative_base_amount_raw,
    cumulative_quote_amount_raw = excluded.cumulative_quote_amount_raw,
    last_price_quote_per_base = excluded.last_price_quote_per_base,
    updated_at = excluded.updated_at
                "#,
            )
            .bind(dto.pair_id)
            .bind(dto.first_slot)
            .bind(dto.last_slot)
            .bind(dto.first_signature.clone())
            .bind(dto.last_signature.clone())
            .bind(dto.trade_count)
            .bind(dto.buy_count)
            .bind(dto.sell_count)
            .bind(dto.cumulative_base_amount_raw.clone())
            .bind(dto.cumulative_quote_amount_raw.clone())
            .bind(dto.last_price_quote_per_base)
            .bind(dto.created_at.to_rfc3339())
            .bind(dto.updated_at.to_rfc3339())
            .execute(pool)
            .await;
            if let Err(error) = query_result {
                return Err(crate::KbError::Db(format!(
                    "cannot upsert kb_pair_metrics on sqlite: {}",
                    error
                )));
            }
            let id_result = sqlx::query_scalar::<sqlx::Sqlite, i64>(
                r#"
SELECT id
FROM kb_pair_metrics
WHERE pair_id = ?
LIMIT 1
                "#,
            )
            .bind(dto.pair_id)
            .fetch_one(pool)
            .await;
            match id_result {
                Ok(id) => return Ok(id),
                Err(error) => {
                    return Err(crate::KbError::Db(format!(
                        "cannot fetch kb_pair_metrics id for pair_id '{}' on sqlite: {}",
                        dto.pair_id, error
                    )));
                },
            }
        },
    }
}

/// Returns one pair-metric row identified by its pair id, if it exists.
pub async fn get_pair_metric_by_pair_id(
    database: &crate::KbDatabase,
    pair_id: i64,
) -> Result<std::option::Option<crate::KbPairMetricDto>, crate::KbError> {
    match database.connection() {
        crate::KbDatabaseConnection::Sqlite(pool) => {
            let query_result = sqlx::query_as::<sqlx::Sqlite, crate::KbPairMetricEntity>(
                r#"
SELECT
    id,
    pair_id,
    first_slot,
    last_slot,
    first_signature,
    last_signature,
    trade_count,
    buy_count,
    sell_count,
    cumulative_base_amount_raw,
    cumulative_quote_amount_raw,
    last_price_quote_per_base,
    created_at,
    updated_at
FROM kb_pair_metrics
WHERE pair_id = ?
LIMIT 1
                    "#,
            )
            .bind(pair_id)
            .fetch_optional(pool)
            .await;
            let entity_option = match query_result {
                Ok(entity_option) => entity_option,
                Err(error) => {
                    return Err(crate::KbError::Db(format!(
                        "cannot read kb_pair_metrics by pair_id '{}' on sqlite: {}",
                        pair_id, error
                    )));
                },
            };
            match entity_option {
                Some(entity) => return crate::KbPairMetricDto::try_from(entity).map(Some),
                None => return Ok(None),
            }
        },
    }
}

/// Lists all pair-metric rows ordered by pair id.
pub async fn list_pair_metrics(
    database: &crate::KbDatabase,
) -> Result<std::vec::Vec<crate::KbPairMetricDto>, crate::KbError> {
    match database.connection() {
        crate::KbDatabaseConnection::Sqlite(pool) => {
            let query_result = sqlx::query_as::<sqlx::Sqlite, crate::KbPairMetricEntity>(
                r#"
SELECT
    id,
    pair_id,
    first_slot,
    last_slot,
    first_signature,
    last_signature,
    trade_count,
    buy_count,
    sell_count,
    cumulative_base_amount_raw,
    cumulative_quote_amount_raw,
    last_price_quote_per_base,
    created_at,
    updated_at
FROM kb_pair_metrics
ORDER BY pair_id ASC
                    "#,
            )
            .fetch_all(pool)
            .await;
            let entities = match query_result {
                Ok(entities) => entities,
                Err(error) => {
                    return Err(crate::KbError::Db(format!(
                        "cannot list kb_pair_metrics on sqlite: {}",
                        error
                    )));
                },
            };
            let mut dtos = std::vec::Vec::new();
            for entity in entities {
                let dto_result = crate::KbPairMetricDto::try_from(entity);
                let dto = match dto_result {
                    Ok(dto) => dto,
                    Err(error) => return Err(error),
                };
                dtos.push(dto);
            }
            return Ok(dtos);
        },
    }
}