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

//! Queries for `k_sol_pools`.

/// Inserts or updates one normalized pool row by address.
pub async fn query_pools_upsert(
    database: &crate::Database,
    dto: &crate::PoolDto,
) -> Result<i64, crate::Error> {
    match database.connection() {
        crate::DatabaseConnection::Sqlite(pool) => {
            let query_result = sqlx::query(
                r#"
INSERT INTO k_sol_pools (
    dex_id,
    address,
    pool_kind,
    status,
    first_seen_at,
    updated_at
)
VALUES (?, ?, ?, ?, ?, ?)
ON CONFLICT(address) DO UPDATE SET
    dex_id = excluded.dex_id,
    pool_kind = excluded.pool_kind,
    status = excluded.status,
    updated_at = excluded.updated_at
                "#,
            )
            .bind(dto.dex_id)
            .bind(dto.address.clone())
            .bind(dto.pool_kind.to_i16())
            .bind(dto.status.to_i16())
            .bind(dto.first_seen_at.to_rfc3339())
            .bind(dto.updated_at.to_rfc3339())
            .execute(pool)
            .await;
            if let Err(error) = query_result {
                return Err(crate::Error::Db(format!(
                    "cannot upsert k_sol_pools on sqlite: {}",
                    error
                )));
            }
            let id_result = sqlx::query_scalar::<sqlx::Sqlite, i64>(
                r#"
SELECT id
FROM k_sol_pools
WHERE address = ?
LIMIT 1
                "#,
            )
            .bind(dto.address.clone())
            .fetch_one(pool)
            .await;
            match id_result {
                Ok(id) => return Ok(id),
                Err(error) => {
                    return Err(crate::Error::Db(format!(
                        "cannot fetch k_sol_pools id for address '{}' on sqlite: {}",
                        dto.address, error
                    )));
                },
            }
        },
    }
}

/// Reads one normalized pool row by address.
pub async fn query_pools_get_by_address(
    database: &crate::Database,
    address: &str,
) -> Result<std::option::Option<crate::PoolDto>, crate::Error> {
    match database.connection() {
        crate::DatabaseConnection::Sqlite(pool) => {
            let query_result = sqlx::query_as::<sqlx::Sqlite, crate::PoolEntity>(
                r#"
SELECT
    id,
    dex_id,
    address,
    pool_kind,
    status,
    first_seen_at,
    updated_at
FROM k_sol_pools
WHERE address = ?
LIMIT 1
                "#,
            )
            .bind(address)
            .fetch_optional(pool)
            .await;
            let entity_option = match query_result {
                Ok(entity_option) => entity_option,
                Err(error) => {
                    return Err(crate::Error::Db(format!(
                        "cannot read k_sol_pools '{}' on sqlite: {}",
                        address, error
                    )));
                },
            };
            match entity_option {
                Some(entity) => {
                    let dto_result = crate::PoolDto::try_from(entity);
                    match dto_result {
                        Ok(dto) => return Ok(Some(dto)),
                        Err(error) => return Err(error),
                    }
                },
                None => return Ok(None),
            }
        },
    }
}

/// Lists normalized pools ordered by id ascending.
pub async fn query_pools_list(
    database: &crate::Database,
) -> Result<std::vec::Vec<crate::PoolDto>, crate::Error> {
    match database.connection() {
        crate::DatabaseConnection::Sqlite(pool) => {
            let query_result = sqlx::query_as::<sqlx::Sqlite, crate::PoolEntity>(
                r#"
SELECT
    id,
    dex_id,
    address,
    pool_kind,
    status,
    first_seen_at,
    updated_at
FROM k_sol_pools
ORDER BY id ASC
                "#,
            )
            .fetch_all(pool)
            .await;
            let entities = match query_result {
                Ok(entities) => entities,
                Err(error) => {
                    return Err(crate::Error::Db(format!(
                        "cannot list k_sol_pools on sqlite: {}",
                        error
                    )));
                },
            };
            let mut dtos = std::vec::Vec::new();
            for entity in entities {
                let dto_result = crate::PoolDto::try_from(entity);
                let dto = match dto_result {
                    Ok(dto) => dto,
                    Err(error) => return Err(error),
                };
                dtos.push(dto);
            }
            return Ok(dtos);
        },
    }
}

#[cfg(test)]
mod tests {
    #[tokio::test]
    async fn pool_roundtrip_works() {
        let tempdir = tempfile::tempdir().expect("tempdir must succeed");
        let database_path = tempdir.path().join("pool_roundtrip.sqlite3");
        let config = crate::DatabaseConfig {
            enabled: true,
            backend: crate::DatabaseBackend::Sqlite,
            sqlite: crate::SqliteDatabaseConfig {
                path: database_path.to_string_lossy().to_string(),
                create_if_missing: true,
                busy_timeout_ms: 5000,
                max_connections: 1,
                auto_initialize_schema: true,
                use_wal: true,
            },
        };
        let database = crate::Database::connect_and_initialize(&config)
            .await
            .expect("database init must succeed");
        let dex_id = crate::query_dexs_upsert(
            &database,
            &crate::DexDto::new("raydium_amm_v4".to_string(), "Raydium AMM v4".to_string(), None, None, true),
        )
        .await
        .expect("dex upsert must succeed");
        let pool_id = crate::query_pools_upsert(
            &database,
            &crate::PoolDto::new(
                dex_id,
                "Pool111111111111111111111111111111111111111".to_string(),
                crate::PoolKind::Amm,
                crate::PoolStatus::Active,
            ),
        )
        .await
        .expect("pool upsert must succeed");
        assert!(pool_id > 0);
        let pool = crate::query_pools_get_by_address(
            &database,
            "Pool111111111111111111111111111111111111111",
        )
        .await
        .expect("get pool must succeed");
        assert!(pool.is_some());
        assert_eq!(pool.expect("pool must exist").pool_kind, crate::PoolKind::Amm);
        let pools = crate::query_pools_list(&database).await.expect("list pools must succeed");
        assert_eq!(pools.len(), 1);
    }
}