scouty 0.3.2

Log parsing, filtering, and analysis library
Documentation 
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#[cfg(test)]
mod tests {
    use crate::filter::engine::{FilterAction, FilterEngine};
    use crate::record::{LogLevel, LogRecord};
    use crate::store::LogStore;
    use crate::view::{LogStoreView, ViewStatus};
    use chrono::{DateTime, NaiveDate, NaiveDateTime, NaiveTime, Utc};
    use std::sync::Arc;

    fn make_record(id: u64, level: LogLevel, message: &str) -> LogRecord {
        let ts = NaiveDateTime::new(
            NaiveDate::from_ymd_opt(2026, 1, 1).unwrap(),
            NaiveTime::from_hms_opt(0, 0, id as u32 % 60).unwrap(),
        )
        .and_utc();
        LogRecord {
            id,
            timestamp: ts,
            level: Some(level),
            source: "test".into(),
            pid: None,
            tid: None,
            component_name: None,
            process_name: None,
            hostname: None,
            container: None,
            context: None,
            function: None,
            message: message.to_string(),
            raw: message.to_string(),
            metadata: None,
            loader_id: "loader".into(),
            expanded: None,
        }
    }

    fn make_store_with_records() -> LogStore {
        let mut store = LogStore::new();
        store.insert(make_record(0, LogLevel::Info, "hello world"));
        store.insert(make_record(1, LogLevel::Error, "something failed"));
        store.insert(make_record(2, LogLevel::Warn, "watch out"));
        store.insert(make_record(3, LogLevel::Info, "all good"));
        store.insert(make_record(4, LogLevel::Debug, "debug trace"));
        store
    }

    #[test]
    fn test_empty_filter_returns_all() {
        let store = make_store_with_records();
        let mut view = LogStoreView::new(FilterEngine::new());
        assert_eq!(view.status(), ViewStatus::Filtering);

        view.apply(&store);

        assert_eq!(view.status(), ViewStatus::Ready);
        assert_eq!(view.len(), 5);
        assert_eq!(view.indices(), &[0, 1, 2, 3, 4]);
    }

    #[test]
    fn test_exclude_filter() {
        let store = make_store_with_records();
        let mut engine = FilterEngine::new();
        engine
            .add_expr_filter(FilterAction::Exclude, r#"level == "ERROR""#)
            .unwrap();

        let mut view = LogStoreView::new(engine);
        view.apply(&store);

        assert_eq!(view.len(), 4);
        // Record at index 1 (Error) should be excluded
        assert!(!view.indices().contains(&1));
    }

    #[test]
    fn test_include_filter() {
        let store = make_store_with_records();
        let mut engine = FilterEngine::new();
        engine
            .add_expr_filter(FilterAction::Include, r#"level == "INFO""#)
            .unwrap();

        let mut view = LogStoreView::new(engine);
        view.apply(&store);

        assert_eq!(view.len(), 2);
        assert_eq!(view.indices(), &[0, 3]);
    }

    #[test]
    fn test_mixed_filters() {
        let store = make_store_with_records();
        let mut engine = FilterEngine::new();
        // Include INFO and WARN
        engine
            .add_expr_filter(FilterAction::Include, r#"level == "INFO""#)
            .unwrap();
        engine
            .add_expr_filter(FilterAction::Include, r#"level == "WARN""#)
            .unwrap();
        // Exclude "all good"
        engine
            .add_expr_filter(FilterAction::Exclude, "message contains \"all good\"")
            .unwrap();

        let mut view = LogStoreView::new(engine);
        view.apply(&store);

        // INFO records: 0 ("hello world"), 3 ("all good" - excluded)
        // WARN records: 2 ("watch out")
        assert_eq!(view.len(), 2);
        assert_eq!(view.indices(), &[0, 2]);
    }

    #[test]
    fn test_get_record() {
        let store = make_store_with_records();
        let mut view = LogStoreView::new(FilterEngine::new());
        view.apply(&store);

        let r = view.get_record(1, &store).unwrap();
        assert_eq!(r.message, "something failed");

        assert!(view.get_record(100, &store).is_none());
    }

    #[test]
    fn test_reapply_after_store_change() {
        let mut store = make_store_with_records();
        let mut view = LogStoreView::new(FilterEngine::new());
        view.apply(&store);
        assert_eq!(view.len(), 5);

        // Add more records
        store.insert(make_record(5, LogLevel::Info, "new record"));
        view.apply(&store);
        assert_eq!(view.len(), 6);
    }

    #[test]
    fn test_is_empty() {
        let store = make_store_with_records();
        let mut engine = FilterEngine::new();
        engine
            .add_expr_filter(FilterAction::Include, r#"level == "FATAL""#)
            .unwrap();

        let mut view = LogStoreView::new(engine);
        view.apply(&store);

        assert!(view.is_empty());
        assert_eq!(view.len(), 0);
    }

    // --- P1: Incremental filtering tests ---

    #[test]
    fn test_incremental_apply_new_records() {
        let mut store = LogStore::new();
        store.insert(make_record(0, LogLevel::Info, "msg0"));
        store.insert(make_record(1, LogLevel::Error, "msg1"));

        let mut view = LogStoreView::new(FilterEngine::new());
        view.apply(&store);
        assert_eq!(view.len(), 2);
        assert_eq!(view.last_applied_count(), 2);

        // Add more records
        store.insert(make_record(2, LogLevel::Warn, "msg2"));
        store.insert(make_record(3, LogLevel::Info, "msg3"));

        // Incremental: only processes new records
        view.apply_incremental(&store);
        assert_eq!(view.len(), 4);
        assert_eq!(view.last_applied_count(), 4);
        assert_eq!(view.indices(), &[0, 1, 2, 3]);
    }

    #[test]
    fn test_incremental_apply_with_filter() {
        let mut store = LogStore::new();
        store.insert(make_record(0, LogLevel::Info, "msg0"));
        store.insert(make_record(1, LogLevel::Error, "msg1"));

        let mut engine = FilterEngine::new();
        engine
            .add_expr_filter(FilterAction::Include, r#"level == "INFO""#)
            .unwrap();

        let mut view = LogStoreView::new(engine);
        view.apply(&store);
        assert_eq!(view.len(), 1); // only msg0 (INFO)
        assert_eq!(view.indices(), &[0]);

        // Add more records
        store.insert(make_record(2, LogLevel::Info, "msg2"));
        store.insert(make_record(3, LogLevel::Error, "msg3"));

        view.apply_incremental(&store);
        assert_eq!(view.len(), 2); // msg0 + msg2 (both INFO)
        assert_eq!(view.indices(), &[0, 2]);
    }

    #[test]
    fn test_incremental_noop_when_no_new_records() {
        let store = make_store_with_records();
        let mut view = LogStoreView::new(FilterEngine::new());
        view.apply(&store);
        assert_eq!(view.len(), 5);

        // Incremental with no new records — no change
        view.apply_incremental(&store);
        assert_eq!(view.len(), 5);
    }

    // --- P1: View statistics tests ---

    #[test]
    fn test_stats_no_filter() {
        let store = make_store_with_records();
        let mut view = LogStoreView::new(FilterEngine::new());
        view.apply(&store);

        let stats = view.stats();
        assert_eq!(stats.total_records, 5);
        assert_eq!(stats.filtered_records, 5);
        assert!((stats.filter_rate() - 0.0).abs() < f64::EPSILON);

        assert_eq!(
            *stats.level_counts_total.get(&Some(LogLevel::Info)).unwrap(),
            2
        );
        assert_eq!(
            *stats
                .level_counts_total
                .get(&Some(LogLevel::Error))
                .unwrap(),
            1
        );
        assert_eq!(
            *stats.level_counts_total.get(&Some(LogLevel::Warn)).unwrap(),
            1
        );
        assert_eq!(
            *stats
                .level_counts_total
                .get(&Some(LogLevel::Debug))
                .unwrap(),
            1
        );

        // Filtered counts should match total (no filter)
        assert_eq!(stats.level_counts_filtered, stats.level_counts_total);
    }

    #[test]
    fn test_stats_with_filter() {
        let store = make_store_with_records();
        let mut engine = FilterEngine::new();
        engine
            .add_expr_filter(FilterAction::Include, r#"level == "INFO""#)
            .unwrap();

        let mut view = LogStoreView::new(engine);
        view.apply(&store);

        let stats = view.stats();
        assert_eq!(stats.total_records, 5);
        assert_eq!(stats.filtered_records, 2);
        assert!((stats.filter_rate() - 0.6).abs() < 0.01);

        // Total still shows all levels
        assert_eq!(
            *stats
                .level_counts_total
                .get(&Some(LogLevel::Error))
                .unwrap(),
            1
        );
        // Filtered only has INFO
        assert_eq!(
            *stats
                .level_counts_filtered
                .get(&Some(LogLevel::Info))
                .unwrap(),
            2
        );
        assert!(stats
            .level_counts_filtered
            .get(&Some(LogLevel::Error))
            .is_none());
    }

    #[test]
    fn test_stats_after_incremental() {
        let mut store = LogStore::new();
        store.insert(make_record(0, LogLevel::Info, "msg0"));

        let mut view = LogStoreView::new(FilterEngine::new());
        view.apply(&store);
        assert_eq!(view.stats().total_records, 1);
        assert_eq!(view.stats().filtered_records, 1);

        store.insert(make_record(1, LogLevel::Error, "msg1"));
        view.apply_incremental(&store);

        assert_eq!(view.stats().total_records, 2);
        assert_eq!(view.stats().filtered_records, 2);
        assert_eq!(
            *view
                .stats()
                .level_counts_total
                .get(&Some(LogLevel::Info))
                .unwrap(),
            1
        );
        assert_eq!(
            *view
                .stats()
                .level_counts_total
                .get(&Some(LogLevel::Error))
                .unwrap(),
            1
        );
    }

    #[test]
    fn test_stats_empty_store() {
        let store = LogStore::new();
        let mut view = LogStoreView::new(FilterEngine::new());
        view.apply(&store);

        assert_eq!(view.stats().total_records, 0);
        assert_eq!(view.stats().filtered_records, 0);
        assert!((view.stats().filter_rate() - 0.0).abs() < f64::EPSILON);
    }
}