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

//! Queries for `kb_db_runtime_events`.

/// Inserts one runtime event row and returns its numeric id.
pub async fn insert_db_runtime_event(
    database: &crate::KbDatabase,
    dto: &crate::KbDbRuntimeEventDto,
) -> Result<i64, crate::KbError> {
    match database.connection() {
        crate::KbDatabaseConnection::Sqlite(pool) => {
            let query_result = sqlx::query(
                r#"
INSERT INTO kb_db_runtime_events (
    event_kind,
    level,
    source,
    message,
    created_at
)
VALUES (?, ?, ?, ?, ?)
                "#,
            )
            .bind(dto.event_kind.clone())
            .bind(dto.level.to_i16())
            .bind(dto.source.clone())
            .bind(dto.message.clone())
            .bind(dto.created_at.to_rfc3339())
            .execute(pool)
            .await;
            let query_result = match query_result {
                Ok(query_result) => query_result,
                Err(error) => {
                    return Err(crate::KbError::Db(format!(
                        "cannot insert kb_db_runtime_events on sqlite: {}",
                        error
                    )));
                }
            };
            Ok(query_result.last_insert_rowid())
        }
    }
}

/// Lists recent runtime events ordered from newest to oldest.
pub async fn list_recent_db_runtime_events(
    database: &crate::KbDatabase,
    limit: u32,
) -> Result<std::vec::Vec<crate::KbDbRuntimeEventDto>, crate::KbError> {
    if limit == 0 {
        return Ok(std::vec::Vec::new());
    }
    match database.connection() {
        crate::KbDatabaseConnection::Sqlite(pool) => {
            let query_result = sqlx::query_as::<sqlx::Sqlite, crate::KbDbRuntimeEventEntity>(
                r#"
SELECT
    id,
    event_kind,
    level,
    source,
    message,
    created_at
FROM kb_db_runtime_events
ORDER BY id DESC
LIMIT ?
                    "#,
            )
            .bind(i64::from(limit))
            .fetch_all(pool)
            .await;
            let entities = match query_result {
                Ok(entities) => entities,
                Err(error) => {
                    return Err(crate::KbError::Db(format!(
                        "cannot list runtime events on sqlite: {}",
                        error
                    )));
                }
            };
            let mut dtos = std::vec::Vec::new();
            for entity in entities {
                let dto_result = crate::KbDbRuntimeEventDto::try_from(entity);
                let dto = match dto_result {
                    Ok(dto) => dto,
                    Err(error) => return Err(error),
                };
                dtos.push(dto);
            }
            Ok(dtos)
        }
    }
}

#[cfg(test)]
mod tests {
    #[tokio::test]
    async fn runtime_event_roundtrip_works() {
        let tempdir = tempfile::tempdir().expect("tempdir must succeed");
        let database_path = tempdir.path().join("runtime_event.sqlite3");
        let config = crate::KbDatabaseConfig {
            enabled: true,
            backend: crate::KbDatabaseBackend::Sqlite,
            sqlite: crate::KbSqliteDatabaseConfig {
                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::KbDatabase::connect_and_initialize(&config)
            .await
            .expect("database init must succeed");
        let dto = crate::KbDbRuntimeEventDto::new(
            "http_request".to_string(),
            crate::KbDbRuntimeEventLevel::Info,
            "demo_http".to_string(),
            "getHealth executed".to_string(),
        );
        let inserted_id = crate::insert_db_runtime_event(&database, &dto)
            .await
            .expect("insert must succeed");
        assert!(inserted_id > 0);
        let listed = crate::list_recent_db_runtime_events(&database, 10)
            .await
            .expect("list must succeed");
        assert_eq!(listed.len(), 1);
        assert_eq!(listed[0].event_kind, "http_request");
        assert_eq!(listed[0].level, crate::KbDbRuntimeEventLevel::Info);
    }
}