//! Test Suite for Parquet Timestamp Loading
//!
//! Validates that `load_parquet_data_with_timestamps()` returns:
//! 1. Three vectors with the same length (features, timestamps, bars)
//! 2. Correct count after warmup (after 50 bars warmup)
//! 3. Timestamps monotonically increasing
//! 4. Bars have valid OHLCV data
//!
//! ## Test Data
//! - File: test_data/ES_FUT_unseen.parquet
//! - Warmup: 50 bars
//! - Expected output: Feature vectors with timestamps and bars (all same length)

use ml::data_loaders::parquet_utils::load_parquet_data_with_timestamps;
use std::path::PathBuf;

/// Helper function to find test data file across different working directories
fn find_test_data_file() -> Option<PathBuf> {
    let possible_paths = [
        "test_data/ES_FUT_unseen.parquet",
        "../test_data/ES_FUT_unseen.parquet",
        "/home/jgrusewski/Work/foxhunt/test_data/ES_FUT_unseen.parquet",
    ];

    possible_paths
        .iter()
        .map(|p| PathBuf::from(p))
        .find(|p| p.exists())
}

#[test]
fn test_load_parquet_data_with_timestamps() {
    // Arrange: Use production unseen data
    let path = find_test_data_file()
        .expect("Could not find test_data/ES_FUT_unseen.parquet. Tried: [test_data/, ../test_data/, /home/jgrusewski/Work/foxhunt/test_data/]");
    let warmup_bars = 50;

    // Act: Load features, timestamps, and bars
    let result = load_parquet_data_with_timestamps(&path, warmup_bars);
    assert!(
        result.is_ok(),
        "Failed to load Parquet data with timestamps: {:?}",
        result.err()
    );

    let (features, timestamps, bars) = result.unwrap();

    // Assert 1: All three vectors have the same length
    assert_eq!(
        features.len(),
        timestamps.len(),
        "Features and timestamps must have the same length"
    );
    assert_eq!(
        features.len(),
        bars.len(),
        "Features and bars must have the same length"
    );

    // Assert 2: Reasonable count (should have data after warmup)
    assert!(
        features.len() > 0,
        "Expected at least some feature vectors after warmup, got {}",
        features.len()
    );

    println!(
        "Loaded {} feature vectors after {} warmup bars",
        features.len(),
        warmup_bars
    );

    // Assert 3: Timestamps are monotonically increasing
    assert!(
        timestamps.windows(2).all(|w| w[0] <= w[1]),
        "Timestamps must be monotonically increasing"
    );

    // Assert 4: Bars have valid OHLCV data
    for (i, bar) in bars.iter().enumerate() {
        assert!(
            bar.open > 0.0 && bar.open.is_finite(),
            "Bar {} has invalid open price: {}",
            i,
            bar.open
        );
        assert!(
            bar.high > 0.0 && bar.high.is_finite(),
            "Bar {} has invalid high price: {}",
            i,
            bar.high
        );
        assert!(
            bar.low > 0.0 && bar.low.is_finite(),
            "Bar {} has invalid low price: {}",
            i,
            bar.low
        );
        assert!(
            bar.close > 0.0 && bar.close.is_finite(),
            "Bar {} has invalid close price: {}",
            i,
            bar.close
        );
        assert!(
            bar.volume > 0.0 && bar.volume.is_finite(),
            "Bar {} has invalid volume: {}",
            i,
            bar.volume
        );
    }

    // Assert 5: Features have correct dimensionality (225)
    for (i, feature_vec) in features.iter().enumerate() {
        assert_eq!(
            feature_vec.len(),
            225,
            "Feature vector {} has incorrect length: {}",
            i,
            feature_vec.len()
        );

        // Validate no NaN/Inf in features
        for (feat_idx, &value) in feature_vec.iter().enumerate() {
            assert!(
                value.is_finite(),
                "Feature vector {} has NaN/Inf at index {}: {}",
                i,
                feat_idx,
                value
            );
        }
    }

    println!(
        "✅ Successfully loaded {} feature vectors with timestamps and OHLCV bars",
        features.len()
    );
}

#[test]
fn test_timestamps_match_bars() {
    // Arrange: Load data
    let path = find_test_data_file().expect("Could not find test_data/ES_FUT_unseen.parquet");
    let warmup_bars = 50;

    // Act
    let (_features, timestamps, bars) =
        load_parquet_data_with_timestamps(&path, warmup_bars).expect("Failed to load Parquet data");

    // Assert: Timestamps from return value match timestamps from bars
    for (i, (ts, bar)) in timestamps.iter().zip(bars.iter()).enumerate() {
        assert_eq!(
            ts, &bar.timestamp,
            "Timestamp mismatch at index {}: returned timestamp {:?} != bar timestamp {:?}",
            i, ts, bar.timestamp
        );
    }

    println!(
        "✅ All {} timestamps match corresponding bars",
        timestamps.len()
    );
}

#[test]
fn test_features_match_bars() {
    // Arrange: Load data
    let path = find_test_data_file().expect("Could not find test_data/ES_FUT_unseen.parquet");
    let warmup_bars = 50;

    // Act
    let (features, _timestamps, bars) =
        load_parquet_data_with_timestamps(&path, warmup_bars).expect("Failed to load Parquet data");

    // Assert: Number of features matches number of bars
    assert_eq!(
        features.len(),
        bars.len(),
        "Number of feature vectors must match number of bars"
    );

    // Assert: OHLCV values in bars are valid (basic sanity checks)
    for (i, bar) in bars.iter().enumerate() {
        assert!(
            bar.open > 0.0 && bar.open.is_finite(),
            "Bar {} has invalid open price: {}",
            i,
            bar.open
        );
        assert!(
            bar.high >= bar.low,
            "Bar {} has high < low: high={}, low={}",
            i,
            bar.high,
            bar.low
        );
        assert!(
            bar.close >= bar.low && bar.close <= bar.high,
            "Bar {} has close outside [low, high]: close={}, low={}, high={}",
            i,
            bar.close,
            bar.low,
            bar.high
        );
        assert!(
            bar.volume > 0.0 && bar.volume.is_finite(),
            "Bar {} has invalid volume: {}",
            i,
            bar.volume
        );
    }

    println!("✅ All {} bars have valid OHLCV relationships", bars.len());
}