//! Storage and parquet persistence edge case tests
//!
//! Covers disk operations, corruption scenarios, and persistence edge cases
//!
//! NOTE: Many tests commented out due to API changes:
//! - ParquetReader/ParquetWriter removed (now using ParquetMarketDataWriter)
//! - CompressionConfig/VersioningConfig renamed to DataCompressionConfig/DataVersioningConfig
//! TODO: Rewrite tests to match current APIs
#![allow(unused_crate_dependencies)]

use chrono::Utc;
use config::data_config::{DataCompressionAlgorithm, DataStorageConfig, DataStorageFormat};
use data::error::DataError;
// TODO: ParquetReader and ParquetWriter have been removed - use ParquetMarketDataWriter instead
// use data::parquet_persistence::{ParquetReader, ParquetWriter};
use data::storage::{EnhancedDatasetMetadata, StorageManager};
use std::collections::HashMap;
use std::path::PathBuf;

// ============================================================================
// Storage Manager Tests - Edge Cases
// ============================================================================

#[tokio::test]
async fn test_storage_with_readonly_directory() {
    // Skip on Windows where readonly handling is different
    #[cfg(not(target_os = "windows"))]
    {
        use std::os::unix::fs::PermissionsExt;

        let temp_dir = std::env::temp_dir().join("foxhunt_readonly_test");
        let _ = std::fs::create_dir_all(&temp_dir);

        // Make directory readonly
        let metadata = std::fs::metadata(&temp_dir).unwrap();
        let mut permissions = metadata.permissions();
        permissions.set_mode(0o444); // readonly
        std::fs::set_permissions(&temp_dir, permissions).ok();

        let config = DataStorageConfig {
            format: DataStorageFormat::Parquet,
            compression: config::data_config::DataCompressionConfig {
                enabled: false,
                algorithm: DataCompressionAlgorithm::None,
                level: Some(0),
            },
            path: temp_dir.to_string_lossy().to_string(),
            base_directory: temp_dir.clone(),
            partition_by: vec![],
            versioning: config::data_config::DataVersioningConfig {
                enabled: false,
                version_format: "v%Y%m%d_%H%M%S".to_string(),
                keep_versions: 1,
            },
            retention: config::data_config::DataRetentionConfig::default(),
        };

        let result = StorageManager::new(config).await;
        // Should fail due to readonly
        assert!(result.is_err());

        // Cleanup - restore permissions
        let metadata = std::fs::metadata(&temp_dir).unwrap();
        let mut permissions = metadata.permissions();
        permissions.set_mode(0o755);
        std::fs::set_permissions(&temp_dir, permissions).ok();
        std::fs::remove_dir_all(&temp_dir).ok();
    }
}

#[tokio::test]
async fn test_storage_concurrent_writes() {
    let temp_dir = std::env::temp_dir().join("foxhunt_concurrent_test");
    let _ = std::fs::remove_dir_all(&temp_dir);

    let config = DataStorageConfig {
        format: DataStorageFormat::Parquet,
        compression: config::data_config::DataCompressionConfig {
            enabled: false,
            algorithm: DataCompressionAlgorithm::None,
            level: Some(0),
        },
        path: temp_dir.to_string_lossy().to_string(),
        base_directory: temp_dir.clone(),
        partition_by: vec![],
        versioning: config::data_config::DataVersioningConfig {
            enabled: true,
            version_format: "v%Y%m%d_%H%M%S".to_string(),
            keep_versions: 10,
        },
        retention: config::data_config::DataRetentionConfig::default(),
    };

    let storage = StorageManager::new(config).await.unwrap();

    // Simulate concurrent writes
    let handles: Vec<_> = (0..5)
        .map(|i| {
            let id = format!("dataset_{}", i);
            let data = vec![i as u8; 1000];
            tokio::spawn(async move {
                // Simulate write operation
                Ok::<_, DataError>(())
            })
        })
        .collect();

    for handle in handles {
        assert!(handle.await.is_ok());
    }

    // Cleanup
    std::fs::remove_dir_all(&temp_dir).ok();
}

#[tokio::test]
async fn test_storage_version_overflow() {
    let temp_dir = std::env::temp_dir().join("foxhunt_version_test");
    let _ = std::fs::remove_dir_all(&temp_dir);

    let config = DataStorageConfig {
        format: DataStorageFormat::Parquet,
        compression: config::data_config::DataCompressionConfig {
            enabled: false,
            algorithm: DataCompressionAlgorithm::None,
            level: Some(0),
        },
        path: temp_dir.to_string_lossy().to_string(),
        base_directory: temp_dir.clone(),
        partition_by: vec![],
        versioning: config::data_config::DataVersioningConfig {
            enabled: true,
            version_format: "v%Y%m%d_%H%M%S".to_string(),
            keep_versions: 3, // Small limit
        },
        retention: config::data_config::DataRetentionConfig::default(),
    };

    let storage = StorageManager::new(config).await;
    assert!(storage.is_ok());

    // Cleanup
    std::fs::remove_dir_all(&temp_dir).ok();
}

#[test]
fn test_metadata_serialization_edge_cases() {
    let metadata = EnhancedDatasetMetadata {
        id: "test_dataset".to_string(),
        version: "v1.0.0".to_string(),
        created_at: Utc::now(),
        file_path: PathBuf::from("/path/to/file"),
        original_size: usize::MAX,
        compressed_size: 0,
        compression_ratio: 0.0,
        format: DataStorageFormat::Parquet,
        checksum: "a".repeat(64),
        tags: HashMap::new(),
    };

    let json = serde_json::to_string(&metadata).unwrap();
    let deserialized: EnhancedDatasetMetadata = serde_json::from_str(&json).unwrap();

    assert_eq!(metadata.id, deserialized.id);
    assert_eq!(metadata.original_size, deserialized.original_size);
}

#[test]
fn test_metadata_with_special_characters() {
    let mut tags = HashMap::new();
    tags.insert("key with spaces".to_string(), "value".to_string());
    tags.insert("unicode_🦀".to_string(), "value_🔥".to_string());
    tags.insert("special!@#$%".to_string(), "chars&*()".to_string());

    let metadata = EnhancedDatasetMetadata {
        id: "test/dataset:with:special".to_string(),
        version: "v1.0.0-alpha+001".to_string(),
        created_at: Utc::now(),
        file_path: PathBuf::from("/path/with spaces/file.parquet"),
        original_size: 1000,
        compressed_size: 500,
        compression_ratio: 0.5,
        format: DataStorageFormat::Parquet,
        checksum: "abc123".to_string(),
        tags,
    };

    let json = serde_json::to_string(&metadata).unwrap();
    let deserialized: EnhancedDatasetMetadata = serde_json::from_str(&json).unwrap();

    assert_eq!(metadata.tags.len(), deserialized.tags.len());
}

// ============================================================================
// Compression Tests - Edge Cases
// ============================================================================

#[test]
fn test_compression_empty_data() {
    let empty_data: Vec<u8> = vec![];

    // ZSTD compression
    let compressed = zstd::encode_all(&empty_data[..], 3);
    assert!(compressed.is_ok());

    let decompressed = zstd::decode_all(&compressed.unwrap()[..]);
    assert!(decompressed.is_ok());
    assert_eq!(decompressed.unwrap(), empty_data);
}

#[test]
fn test_compression_single_byte() {
    let single_byte: Vec<u8> = vec![0xFF];

    let compressed = zstd::encode_all(&single_byte[..], 3).unwrap();
    let decompressed = zstd::decode_all(&compressed[..]).unwrap();

    assert_eq!(single_byte, decompressed);
}

#[test]
fn test_compression_highly_compressible() {
    let data: Vec<u8> = vec![0; 100_000]; // All zeros

    let compressed = zstd::encode_all(&data[..], 3).unwrap();
    let ratio = compressed.len() as f64 / data.len() as f64;

    // Should achieve very high compression
    assert!(ratio < 0.01);
}

#[test]
fn test_compression_random_data() {
    use rand::Rng;

    let mut rng = rand::thread_rng();
    let data: Vec<u8> = (0..10_000).map(|_| rng.gen()).collect();

    let compressed = zstd::encode_all(&data[..], 3).unwrap();
    let ratio = compressed.len() as f64 / data.len() as f64;

    // Random data shouldn't compress well
    assert!(ratio > 0.8);
}

#[test]
fn test_compression_max_level() {
    let data: Vec<u8> = vec![1, 2, 3, 4, 5];

    // Test maximum compression level (22 for ZSTD)
    let compressed = zstd::encode_all(&data[..], 22).unwrap();
    let decompressed = zstd::decode_all(&compressed[..]).unwrap();

    assert_eq!(data, decompressed);
}

#[test]
fn test_compression_negative_level() {
    let data: Vec<u8> = vec![1, 2, 3, 4, 5];

    // ZSTD supports negative levels for faster compression
    let compressed = zstd::encode_all(&data[..], -1).unwrap();
    let decompressed = zstd::decode_all(&compressed[..]).unwrap();

    assert_eq!(data, decompressed);
}

// ============================================================================
// Checksum Tests - Edge Cases
// ============================================================================

#[test]
fn test_checksum_empty_data() {
    use sha2::{Digest, Sha256};

    let empty: Vec<u8> = vec![];
    let hash = Sha256::digest(&empty);
    let hex = format!("{:x}", hash);

    assert_eq!(hex.len(), 64);
    assert_eq!(
        hex,
        "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
    );
}

#[test]
fn test_checksum_consistency() {
    use sha2::{Digest, Sha256};

    let data = b"test data";
    let hash1 = format!("{:x}", Sha256::digest(data));
    let hash2 = format!("{:x}", Sha256::digest(data));

    assert_eq!(hash1, hash2);
}

#[test]
fn test_checksum_different_data() {
    use sha2::{Digest, Sha256};

    let data1 = b"test data 1";
    let data2 = b"test data 2";

    let hash1 = format!("{:x}", Sha256::digest(data1));
    let hash2 = format!("{:x}", Sha256::digest(data2));

    assert_ne!(hash1, hash2);
}

#[test]
fn test_checksum_large_data() {
    use sha2::{Digest, Sha256};

    let large_data: Vec<u8> = vec![0xFF; 10_000_000]; // 10MB
    let hash = format!("{:x}", Sha256::digest(&large_data));

    assert_eq!(hash.len(), 64);
}

// ============================================================================
// File Path Tests - Edge Cases
// ============================================================================

#[test]
fn test_path_normalization() {
    let paths = vec![
        PathBuf::from("/path/to/file"),
        PathBuf::from("/path/to/../to/file"),
        PathBuf::from("./path/to/file"),
        PathBuf::from("../path/to/file"),
    ];

    for path in paths {
        assert!(path.to_string_lossy().len() > 0);
    }
}

#[test]
fn test_path_with_unicode() {
    let unicode_paths = vec![
        PathBuf::from("/path/to/файл.parquet"),
        PathBuf::from("/path/to/文件.parquet"),
        PathBuf::from("/path/to/🦀.parquet"),
    ];

    for path in unicode_paths {
        assert!(path.to_string_lossy().len() > 0);
    }
}

#[test]
fn test_path_max_length() {
    // Test very long path
    let long_component = "a".repeat(100);
    let long_path = format!(
        "/path/{}/{}/{}",
        long_component, long_component, long_component
    );
    let path = PathBuf::from(long_path);

    assert!(path.to_string_lossy().len() > 300);
}

// ============================================================================
// Data Corruption Tests
// ============================================================================

#[test]
fn test_corrupted_checksum_detection() {
    use sha2::{Digest, Sha256};

    let data = b"original data";
    let correct_hash = format!("{:x}", Sha256::digest(data));

    let corrupted_data = b"corrupted data";
    let corrupted_hash = format!("{:x}", Sha256::digest(corrupted_data));

    // Checksums should not match
    assert_ne!(correct_hash, corrupted_hash);
}

#[test]
fn test_partial_data_corruption() {
    use sha2::{Digest, Sha256};

    let mut data = vec![0u8; 1000];
    let original_hash = format!("{:x}", Sha256::digest(&data));

    // Corrupt single byte
    data[500] = 0xFF;
    let corrupted_hash = format!("{:x}", Sha256::digest(&data));

    assert_ne!(original_hash, corrupted_hash);
}

// ============================================================================
// Versioning Tests - Edge Cases
// ============================================================================

#[test]
fn test_version_string_parsing() {
    let versions = vec![
        "v1.0.0",
        "v1.2.3-alpha",
        "v2.0.0-rc1",
        "latest",
        "20231201-snapshot",
    ];

    for version in versions {
        assert!(!version.is_empty());
        assert!(version.len() < 100);
    }
}

#[test]
fn test_version_comparison() {
    let versions = vec![
        ("v1.0.0", "v1.0.1"),
        ("v1.9.9", "v2.0.0"),
        ("v1.0.0-alpha", "v1.0.0"),
    ];

    for (v1, v2) in versions {
        // Simple string comparison (not semantic versioning)
        assert!(v1 != v2);
    }
}

// ============================================================================
// Memory Tests
// ============================================================================

#[test]
fn test_large_buffer_allocation() {
    // Test allocation of large buffers
    let sizes = vec![1_000, 10_000, 100_000, 1_000_000];

    for size in sizes {
        let buffer: Vec<u8> = Vec::with_capacity(size);
        assert_eq!(buffer.len(), 0);
        assert!(buffer.capacity() >= size);
    }
}

#[test]
fn test_buffer_reuse() {
    let mut buffer: Vec<u8> = Vec::with_capacity(10_000);

    // Use buffer
    buffer.extend_from_slice(&[0xFF; 5_000]);
    assert_eq!(buffer.len(), 5_000);

    // Clear and reuse
    buffer.clear();
    assert_eq!(buffer.len(), 0);
    assert!(buffer.capacity() >= 5_000);

    // Reuse without reallocation
    buffer.extend_from_slice(&[0xAA; 3_000]);
    assert_eq!(buffer.len(), 3_000);
}

// ============================================================================
// Concurrency Tests
// ============================================================================

#[tokio::test]
async fn test_concurrent_reads() {
    let data = vec![0xFF; 1000];

    let handles: Vec<_> = (0..10)
        .map(|_| {
            let data_clone = data.clone();
            tokio::spawn(async move {
                // Simulate concurrent read
                data_clone.len()
            })
        })
        .collect();

    for handle in handles {
        let len = handle.await.unwrap();
        assert_eq!(len, 1000);
    }
}

// ============================================================================
// Error Recovery Tests
// ============================================================================

#[test]
fn test_io_error_categories() {
    use std::io::ErrorKind;

    let error_kinds = vec![
        ErrorKind::NotFound,
        ErrorKind::PermissionDenied,
        ErrorKind::ConnectionRefused,
        ErrorKind::ConnectionReset,
        ErrorKind::ConnectionAborted,
        ErrorKind::NotConnected,
        ErrorKind::AddrInUse,
        ErrorKind::AddrNotAvailable,
        ErrorKind::BrokenPipe,
        ErrorKind::AlreadyExists,
        ErrorKind::WouldBlock,
        ErrorKind::InvalidInput,
        ErrorKind::InvalidData,
        ErrorKind::TimedOut,
        ErrorKind::WriteZero,
        ErrorKind::Interrupted,
        ErrorKind::UnexpectedEof,
    ];

    for kind in error_kinds {
        let error = std::io::Error::new(kind, "test error");
        let data_error: DataError = error.into();
        assert!(matches!(data_error, DataError::Io(_)));
    }
}

// ============================================================================
// Format Validation Tests
// ============================================================================

#[test]
fn test_storage_format_extensions() {
    let format_extensions = vec![
        (DataStorageFormat::Parquet, "parquet"),
        (DataStorageFormat::Arrow, "arrow"),
        (DataStorageFormat::Json, "json"),
        (DataStorageFormat::Csv, "csv"),
    ];

    for (format, ext) in format_extensions {
        let debug_str = format!("{:?}", format);
        assert!(debug_str.to_lowercase().contains(ext));
    }
}

#[test]
fn test_compression_algorithm_names() {
    let algorithms = vec![
        (DataCompressionAlgorithm::ZSTD, "zstd"),
        (DataCompressionAlgorithm::LZ4, "lz4"),
        (DataCompressionAlgorithm::GZIP, "gzip"),
        (DataCompressionAlgorithm::None, "none"),
    ];

    for (algo, name) in algorithms {
        let debug_str = format!("{:?}", algo);
        assert!(debug_str.to_lowercase().contains(name));
    }
}