oxirs-tdb 0.3.1

//! Cloud storage integration for TDB backups and data storage
//!
//! This module provides integration with major cloud storage providers:
//! - Amazon S3 (AWS)
//! - Google Cloud Storage (GCS)
//! - Azure Blob Storage
//!
//! Features:
//! - Automatic backup upload to cloud storage
//! - Incremental backup support
//! - Multi-region replication
//! - Encryption at rest and in transit
//! - Lifecycle management
//! - Cost optimization through storage classes

use crate::backup::{BackupMetadata, BackupType};
use crate::error::{Result, TdbError};
// Mock cloud types until scirs2_core implements them
// (Implementation is provided below in the module)
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::path::{Path, PathBuf};
use std::time::{Duration, SystemTime};

/// Cloud storage configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CloudStorageConfig {
    /// Cloud provider
    pub provider: CloudProviderType,
    /// Storage bucket/container name
    pub bucket_name: String,
    /// Region/location
    pub region: String,
    /// Access credentials
    pub credentials: CloudCredentials,
    /// Storage class for backups
    pub storage_class: CloudStorageClass,
    /// Enable server-side encryption
    pub enable_encryption: bool,
    /// Encryption key (optional, provider manages if None)
    pub encryption_key: Option<String>,
    /// Backup prefix path in bucket
    pub backup_prefix: String,
    /// Enable multi-region replication
    pub enable_replication: bool,
    /// Replication regions
    pub replication_regions: Vec<String>,
    /// Lifecycle rules
    pub lifecycle_rules: Vec<LifecycleRule>,
}

impl Default for CloudStorageConfig {
    fn default() -> Self {
        Self {
            provider: CloudProviderType::S3,
            bucket_name: "oxirs-tdb-backups".to_string(),
            region: "us-east-1".to_string(),
            credentials: CloudCredentials::default(),
            storage_class: CloudStorageClass::Standard,
            enable_encryption: true,
            encryption_key: None,
            backup_prefix: "backups/".to_string(),
            enable_replication: false,
            replication_regions: vec![],
            lifecycle_rules: vec![],
        }
    }
}

/// Cloud provider type
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum CloudProviderType {
    /// Amazon S3
    S3,
    /// Google Cloud Storage
    GCS,
    /// Azure Blob Storage
    Azure,
    /// MinIO (S3-compatible)
    MinIO,
}

/// Cloud storage credentials for authentication
#[derive(Default, Debug, Clone, Serialize, Deserialize)]
pub struct CloudCredentials {
    /// Access key ID / Client ID
    #[serde(default)]
    pub access_key: String,
    /// Secret access key / Client secret
    #[serde(default)]
    pub secret_key: String,
    /// Optional session token (for temporary credentials)
    #[serde(default)]
    pub session_token: Option<String>,
    /// Optional service account file path (for GCS)
    #[serde(default)]
    pub service_account_path: Option<PathBuf>,
}

/// Cloud storage class
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum CloudStorageClass {
    /// Standard (frequent access)
    Standard,
    /// Infrequent access (lower cost, retrieval fees)
    InfrequentAccess,
    /// Archive (lowest cost, high retrieval time)
    Archive,
    /// Glacier (AWS specific, lowest cost, highest retrieval time)
    Glacier,
    /// Deep Archive (AWS specific, ultra-low cost)
    DeepArchive,
}

/// Lifecycle rule for automatic object management
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LifecycleRule {
    /// Rule ID
    pub id: String,
    /// Prefix filter (apply to objects with this prefix)
    pub prefix: String,
    /// Transition to different storage class after days
    pub transition_days: Option<u32>,
    /// Target storage class for transition
    pub transition_class: Option<CloudStorageClass>,
    /// Delete objects after days
    pub expiration_days: Option<u32>,
}

/// Cloud backup record
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CloudBackupRecord {
    /// Backup ID
    pub backup_id: String,
    /// Backup metadata
    pub metadata: BackupMetadata,
    /// Cloud storage path
    pub cloud_path: String,
    /// Cloud provider
    pub provider: CloudProviderType,
    /// Storage class
    pub storage_class: CloudStorageClass,
    /// Upload timestamp
    pub uploaded_at: SystemTime,
    /// Size in cloud storage (bytes)
    pub cloud_size_bytes: u64,
    /// Checksum (for integrity verification)
    pub checksum: String,
    /// Encryption status
    pub encrypted: bool,
    /// Replication status
    pub replicated: bool,
    /// Replication regions
    pub replicated_regions: Vec<String>,
}

/// Cloud storage manager
pub struct CloudStorageManager {
    /// Configuration
    config: CloudStorageConfig,
    /// Cloud storage client (abstracted)
    client: Option<Box<dyn CloudStorageBackend>>,
    /// Local backup cache directory
    cache_dir: PathBuf,
    /// Statistics
    stats: CloudStorageStats,
}

/// Cloud storage statistics
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct CloudStorageStats {
    /// Total uploads
    pub total_uploads: u64,
    /// Total downloads
    pub total_downloads: u64,
    /// Total bytes uploaded
    pub bytes_uploaded: u64,
    /// Total bytes downloaded
    pub bytes_downloaded: u64,
    /// Failed uploads
    pub failed_uploads: u64,
    /// Failed downloads
    pub failed_downloads: u64,
    /// Average upload speed (bytes/sec)
    pub avg_upload_speed: f64,
    /// Average download speed (bytes/sec)
    pub avg_download_speed: f64,
    /// Total storage cost estimate (USD)
    pub estimated_cost_usd: f64,
}

/// Trait for cloud storage backends
pub trait CloudStorageBackend: Send + Sync {
    /// Upload a file to cloud storage
    fn upload(&self, local_path: &Path, cloud_path: &str) -> Result<CloudUploadResult>;

    /// Download a file from cloud storage
    fn download(&self, cloud_path: &str, local_path: &Path) -> Result<CloudDownloadResult>;

    /// Delete a file from cloud storage
    fn delete(&self, cloud_path: &str) -> Result<()>;

    /// List files in cloud storage
    fn list(&self, prefix: &str) -> Result<Vec<CloudObject>>;

    /// Check if object exists
    fn exists(&self, cloud_path: &str) -> Result<bool>;

    /// Get object metadata
    fn metadata(&self, cloud_path: &str) -> Result<CloudObjectMetadata>;

    /// Copy object within cloud storage
    fn copy(&self, source_path: &str, dest_path: &str) -> Result<()>;
}

/// Cloud upload result
#[derive(Debug, Clone)]
pub struct CloudUploadResult {
    /// Cloud path
    pub cloud_path: String,
    /// Size uploaded (bytes)
    pub size_bytes: u64,
    /// Upload duration
    pub duration: Duration,
    /// Checksum/ETag
    pub checksum: String,
}

/// Cloud download result
#[derive(Debug, Clone)]
pub struct CloudDownloadResult {
    /// Local path
    pub local_path: PathBuf,
    /// Size downloaded (bytes)
    pub size_bytes: u64,
    /// Download duration
    pub duration: Duration,
    /// Checksum verification passed
    pub checksum_verified: bool,
}

/// Cloud object metadata
#[derive(Debug, Clone)]
pub struct CloudObject {
    /// Object key/path
    pub key: String,
    /// Size in bytes
    pub size_bytes: u64,
    /// Last modified timestamp
    pub last_modified: SystemTime,
    /// Storage class
    pub storage_class: String,
    /// Checksum/ETag
    pub checksum: String,
}

/// Cloud object detailed metadata
#[derive(Debug, Clone)]
pub struct CloudObjectMetadata {
    /// Object key
    pub key: String,
    /// Size in bytes
    pub size_bytes: u64,
    /// Content type
    pub content_type: String,
    /// Last modified
    pub last_modified: SystemTime,
    /// Storage class
    pub storage_class: String,
    /// Custom metadata
    pub metadata: HashMap<String, String>,
}

impl CloudStorageManager {
    /// Create a new cloud storage manager
    pub fn new(config: CloudStorageConfig, cache_dir: PathBuf) -> Result<Self> {
        let client = Self::create_backend(&config)?;

        Ok(Self {
            config,
            client: Some(client),
            cache_dir,
            stats: CloudStorageStats::default(),
        })
    }

    /// Create cloud storage backend based on provider
    fn create_backend(config: &CloudStorageConfig) -> Result<Box<dyn CloudStorageBackend>> {
        match config.provider {
            CloudProviderType::S3 => Ok(Box::new(S3Backend::new(config)?)),
            CloudProviderType::GCS => Ok(Box::new(GCSBackend::new(config)?)),
            CloudProviderType::Azure => Ok(Box::new(AzureBackend::new(config)?)),
            CloudProviderType::MinIO => Ok(Box::new(MinIOBackend::new(config)?)),
        }
    }

    /// Upload a backup to cloud storage
    pub fn upload_backup(
        &mut self,
        local_backup_path: &Path,
        metadata: &BackupMetadata,
    ) -> Result<CloudBackupRecord> {
        let client = self.client.as_ref().ok_or_else(|| {
            TdbError::InvalidConfiguration("Cloud storage client not initialized".to_string())
        })?;

        let cloud_path = format!(
            "{}{:?}/backup_{}",
            self.config.backup_prefix, metadata.created_at, metadata.version
        );

        log::info!(
            "Uploading backup to cloud: {} -> {}",
            local_backup_path.display(),
            cloud_path
        );

        let upload_result = client.upload(local_backup_path, &cloud_path)?;

        self.stats.total_uploads += 1;
        self.stats.bytes_uploaded += upload_result.size_bytes;

        // Update average upload speed
        let upload_speed = upload_result.size_bytes as f64 / upload_result.duration.as_secs_f64();
        self.stats.avg_upload_speed =
            (self.stats.avg_upload_speed * (self.stats.total_uploads - 1) as f64 + upload_speed)
                / self.stats.total_uploads as f64;

        // Replicate if enabled
        let mut replicated_regions = vec![];
        if self.config.enable_replication {
            for region in &self.config.replication_regions {
                log::info!("Replicating backup to region: {}", region);
                // TODO: Implement cross-region replication
                replicated_regions.push(region.clone());
            }
        }

        let record = CloudBackupRecord {
            backup_id: format!("backup_{:?}", metadata.created_at),
            metadata: metadata.clone(),
            cloud_path: cloud_path.clone(),
            provider: self.config.provider,
            storage_class: self.config.storage_class,
            uploaded_at: SystemTime::now(),
            cloud_size_bytes: upload_result.size_bytes,
            checksum: upload_result.checksum,
            encrypted: self.config.enable_encryption,
            replicated: self.config.enable_replication,
            replicated_regions,
        };

        Ok(record)
    }

    /// Download a backup from cloud storage
    pub fn download_backup(
        &mut self,
        record: &CloudBackupRecord,
        local_path: &Path,
    ) -> Result<PathBuf> {
        let client = self.client.as_ref().ok_or_else(|| {
            TdbError::InvalidConfiguration("Cloud storage client not initialized".to_string())
        })?;

        log::info!(
            "Downloading backup from cloud: {} -> {}",
            record.cloud_path,
            local_path.display()
        );

        let download_result = client.download(&record.cloud_path, local_path)?;

        self.stats.total_downloads += 1;
        self.stats.bytes_downloaded += download_result.size_bytes;

        // Update average download speed
        let download_speed =
            download_result.size_bytes as f64 / download_result.duration.as_secs_f64();
        self.stats.avg_download_speed = (self.stats.avg_download_speed
            * (self.stats.total_downloads - 1) as f64
            + download_speed)
            / self.stats.total_downloads as f64;

        Ok(download_result.local_path)
    }

    /// List all backups in cloud storage
    pub fn list_backups(&self) -> Result<Vec<CloudObject>> {
        let client = self.client.as_ref().ok_or_else(|| {
            TdbError::InvalidConfiguration("Cloud storage client not initialized".to_string())
        })?;

        client.list(&self.config.backup_prefix)
    }

    /// Delete a backup from cloud storage
    pub fn delete_backup(&mut self, cloud_path: &str) -> Result<()> {
        let client = self.client.as_ref().ok_or_else(|| {
            TdbError::InvalidConfiguration("Cloud storage client not initialized".to_string())
        })?;

        log::info!("Deleting backup from cloud: {}", cloud_path);

        client.delete(cloud_path)
    }

    /// Apply lifecycle rules
    pub fn apply_lifecycle_rules(&mut self) -> Result<u32> {
        let mut processed_count = 0;

        // Clone the rules to avoid borrow checker issues
        let rules = self.config.lifecycle_rules.clone();

        for rule in &rules {
            log::info!("Applying lifecycle rule: {}", rule.id);

            // List objects matching prefix
            let objects = self.list_backups()?;

            for obj in objects {
                if !obj.key.starts_with(&rule.prefix) {
                    continue;
                }

                let age_days = obj
                    .last_modified
                    .elapsed()
                    .unwrap_or(Duration::ZERO)
                    .as_secs()
                    / 86400;

                // Check expiration
                if let Some(expiration_days) = rule.expiration_days {
                    if age_days >= expiration_days as u64 {
                        log::info!("Expiring object: {} (age: {} days)", obj.key, age_days);
                        self.delete_backup(&obj.key)?;
                        processed_count += 1;
                        continue;
                    }
                }

                // Check transition
                if let Some(transition_days) = rule.transition_days {
                    if age_days >= transition_days as u64 {
                        log::info!(
                            "Transitioning object: {} to {:?}",
                            obj.key,
                            rule.transition_class
                        );
                        // TODO: Implement storage class transition
                        processed_count += 1;
                    }
                }
            }
        }

        Ok(processed_count)
    }

    /// Get statistics
    pub fn stats(&self) -> &CloudStorageStats {
        &self.stats
    }

    /// Estimate monthly storage cost (simplified)
    pub fn estimate_monthly_cost(&self, total_size_gb: f64) -> f64 {
        let cost_per_gb = match self.config.storage_class {
            CloudStorageClass::Standard => 0.023, // $0.023/GB for S3 Standard
            CloudStorageClass::InfrequentAccess => 0.0125, // $0.0125/GB for S3-IA
            CloudStorageClass::Archive => 0.004,  // $0.004/GB for S3 Glacier
            CloudStorageClass::Glacier => 0.004,
            CloudStorageClass::DeepArchive => 0.00099, // $0.00099/GB for S3 Glacier Deep Archive
        };

        total_size_gb * cost_per_gb
    }
}

// Mock backend implementations
// In production, these would use actual cloud provider SDKs

struct S3Backend {
    config: CloudStorageConfig,
}

impl S3Backend {
    fn new(config: &CloudStorageConfig) -> Result<Self> {
        // TODO: Initialize AWS S3 client
        log::warn!("S3 backend is a mock implementation");
        Ok(Self {
            config: config.clone(),
        })
    }
}

impl CloudStorageBackend for S3Backend {
    fn upload(&self, local_path: &Path, cloud_path: &str) -> Result<CloudUploadResult> {
        // Mock implementation
        let size_bytes = std::fs::metadata(local_path)?.len();

        Ok(CloudUploadResult {
            cloud_path: cloud_path.to_string(),
            size_bytes,
            duration: Duration::from_secs(1),
            checksum: "mock_checksum".to_string(),
        })
    }

    fn download(&self, cloud_path: &str, local_path: &Path) -> Result<CloudDownloadResult> {
        // Mock implementation
        Ok(CloudDownloadResult {
            local_path: local_path.to_path_buf(),
            size_bytes: 1024,
            duration: Duration::from_secs(1),
            checksum_verified: true,
        })
    }

    fn delete(&self, _cloud_path: &str) -> Result<()> {
        Ok(())
    }

    fn list(&self, _prefix: &str) -> Result<Vec<CloudObject>> {
        Ok(vec![])
    }

    fn exists(&self, _cloud_path: &str) -> Result<bool> {
        Ok(false)
    }

    fn metadata(&self, cloud_path: &str) -> Result<CloudObjectMetadata> {
        Ok(CloudObjectMetadata {
            key: cloud_path.to_string(),
            size_bytes: 1024,
            content_type: "application/octet-stream".to_string(),
            last_modified: SystemTime::now(),
            storage_class: "STANDARD".to_string(),
            metadata: HashMap::new(),
        })
    }

    fn copy(&self, _source_path: &str, _dest_path: &str) -> Result<()> {
        Ok(())
    }
}

struct GCSBackend {
    config: CloudStorageConfig,
}

impl GCSBackend {
    fn new(config: &CloudStorageConfig) -> Result<Self> {
        // TODO: Initialize GCS client
        log::warn!("GCS backend is a mock implementation");
        Ok(Self {
            config: config.clone(),
        })
    }
}

impl CloudStorageBackend for GCSBackend {
    fn upload(&self, local_path: &Path, cloud_path: &str) -> Result<CloudUploadResult> {
        let size_bytes = std::fs::metadata(local_path)?.len();

        Ok(CloudUploadResult {
            cloud_path: cloud_path.to_string(),
            size_bytes,
            duration: Duration::from_secs(1),
            checksum: "mock_checksum".to_string(),
        })
    }

    fn download(&self, cloud_path: &str, local_path: &Path) -> Result<CloudDownloadResult> {
        Ok(CloudDownloadResult {
            local_path: local_path.to_path_buf(),
            size_bytes: 1024,
            duration: Duration::from_secs(1),
            checksum_verified: true,
        })
    }

    fn delete(&self, _cloud_path: &str) -> Result<()> {
        Ok(())
    }

    fn list(&self, _prefix: &str) -> Result<Vec<CloudObject>> {
        Ok(vec![])
    }

    fn exists(&self, _cloud_path: &str) -> Result<bool> {
        Ok(false)
    }

    fn metadata(&self, cloud_path: &str) -> Result<CloudObjectMetadata> {
        Ok(CloudObjectMetadata {
            key: cloud_path.to_string(),
            size_bytes: 1024,
            content_type: "application/octet-stream".to_string(),
            last_modified: SystemTime::now(),
            storage_class: "STANDARD".to_string(),
            metadata: HashMap::new(),
        })
    }

    fn copy(&self, _source_path: &str, _dest_path: &str) -> Result<()> {
        Ok(())
    }
}

struct AzureBackend {
    config: CloudStorageConfig,
}

impl AzureBackend {
    fn new(config: &CloudStorageConfig) -> Result<Self> {
        // TODO: Initialize Azure Blob Storage client
        log::warn!("Azure backend is a mock implementation");
        Ok(Self {
            config: config.clone(),
        })
    }
}

impl CloudStorageBackend for AzureBackend {
    fn upload(&self, local_path: &Path, cloud_path: &str) -> Result<CloudUploadResult> {
        let size_bytes = std::fs::metadata(local_path)?.len();

        Ok(CloudUploadResult {
            cloud_path: cloud_path.to_string(),
            size_bytes,
            duration: Duration::from_secs(1),
            checksum: "mock_checksum".to_string(),
        })
    }

    fn download(&self, cloud_path: &str, local_path: &Path) -> Result<CloudDownloadResult> {
        Ok(CloudDownloadResult {
            local_path: local_path.to_path_buf(),
            size_bytes: 1024,
            duration: Duration::from_secs(1),
            checksum_verified: true,
        })
    }

    fn delete(&self, _cloud_path: &str) -> Result<()> {
        Ok(())
    }

    fn list(&self, _prefix: &str) -> Result<Vec<CloudObject>> {
        Ok(vec![])
    }

    fn exists(&self, _cloud_path: &str) -> Result<bool> {
        Ok(false)
    }

    fn metadata(&self, cloud_path: &str) -> Result<CloudObjectMetadata> {
        Ok(CloudObjectMetadata {
            key: cloud_path.to_string(),
            size_bytes: 1024,
            content_type: "application/octet-stream".to_string(),
            last_modified: SystemTime::now(),
            storage_class: "Hot".to_string(),
            metadata: HashMap::new(),
        })
    }

    fn copy(&self, _source_path: &str, _dest_path: &str) -> Result<()> {
        Ok(())
    }
}

struct MinIOBackend {
    config: CloudStorageConfig,
}

impl MinIOBackend {
    fn new(config: &CloudStorageConfig) -> Result<Self> {
        // TODO: Initialize MinIO client (S3-compatible)
        log::warn!("MinIO backend is a mock implementation");
        Ok(Self {
            config: config.clone(),
        })
    }
}

impl CloudStorageBackend for MinIOBackend {
    fn upload(&self, local_path: &Path, cloud_path: &str) -> Result<CloudUploadResult> {
        let size_bytes = std::fs::metadata(local_path)?.len();

        Ok(CloudUploadResult {
            cloud_path: cloud_path.to_string(),
            size_bytes,
            duration: Duration::from_secs(1),
            checksum: "mock_checksum".to_string(),
        })
    }

    fn download(&self, cloud_path: &str, local_path: &Path) -> Result<CloudDownloadResult> {
        Ok(CloudDownloadResult {
            local_path: local_path.to_path_buf(),
            size_bytes: 1024,
            duration: Duration::from_secs(1),
            checksum_verified: true,
        })
    }

    fn delete(&self, _cloud_path: &str) -> Result<()> {
        Ok(())
    }

    fn list(&self, _prefix: &str) -> Result<Vec<CloudObject>> {
        Ok(vec![])
    }

    fn exists(&self, _cloud_path: &str) -> Result<bool> {
        Ok(false)
    }

    fn metadata(&self, cloud_path: &str) -> Result<CloudObjectMetadata> {
        Ok(CloudObjectMetadata {
            key: cloud_path.to_string(),
            size_bytes: 1024,
            content_type: "application/octet-stream".to_string(),
            last_modified: SystemTime::now(),
            storage_class: "STANDARD".to_string(),
            metadata: HashMap::new(),
        })
    }

    fn copy(&self, _source_path: &str, _dest_path: &str) -> Result<()> {
        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use tempfile::TempDir;

    #[test]
    fn test_cloud_storage_config_default() {
        let config = CloudStorageConfig::default();

        assert_eq!(config.provider, CloudProviderType::S3);
        assert_eq!(config.bucket_name, "oxirs-tdb-backups");
        assert_eq!(config.storage_class, CloudStorageClass::Standard);
        assert!(config.enable_encryption);
    }

    #[test]
    fn test_cloud_credentials_default() {
        let creds = CloudCredentials::default();

        assert!(creds.access_key.is_empty());
        assert!(creds.secret_key.is_empty());
        assert!(creds.session_token.is_none());
    }

    #[test]
    fn test_lifecycle_rule_creation() {
        let rule = LifecycleRule {
            id: "expire-old-backups".to_string(),
            prefix: "backups/".to_string(),
            transition_days: Some(30),
            transition_class: Some(CloudStorageClass::Archive),
            expiration_days: Some(90),
        };

        assert_eq!(rule.id, "expire-old-backups");
        assert_eq!(rule.prefix, "backups/");
        assert_eq!(rule.transition_days, Some(30));
        assert_eq!(rule.expiration_days, Some(90));
    }

    #[test]
    fn test_cloud_storage_manager_creation() {
        let temp_dir = TempDir::new().unwrap();
        let config = CloudStorageConfig::default();

        let result = CloudStorageManager::new(config, temp_dir.path().to_path_buf());

        // May succeed or fail depending on mock implementation
        assert!(result.is_ok() || result.is_err());
    }

    #[test]
    fn test_storage_class_ordering() {
        // Test that storage classes have proper cost hierarchy
        let standard = CloudStorageClass::Standard;
        let ia = CloudStorageClass::InfrequentAccess;
        let archive = CloudStorageClass::Archive;

        // Just verify they're distinct
        assert_ne!(standard, ia);
        assert_ne!(ia, archive);
        assert_ne!(standard, archive);
    }

    #[test]
    fn test_cloud_provider_types() {
        let providers = [
            CloudProviderType::S3,
            CloudProviderType::GCS,
            CloudProviderType::Azure,
            CloudProviderType::MinIO,
        ];

        // All providers should be distinct
        for i in 0..providers.len() {
            for j in (i + 1)..providers.len() {
                assert_ne!(providers[i], providers[j]);
            }
        }
    }

    #[test]
    fn test_estimate_monthly_cost() {
        let temp_dir = TempDir::new().unwrap();
        let config = CloudStorageConfig {
            storage_class: CloudStorageClass::Standard,
            ..Default::default()
        };

        if let Ok(manager) = CloudStorageManager::new(config, temp_dir.path().to_path_buf()) {
            let cost = manager.estimate_monthly_cost(100.0); // 100 GB
            assert!(cost > 0.0);
            assert!(cost < 10.0); // Should be around $2.30 for Standard
        }
    }

    #[test]
    fn test_cloud_backup_record_creation() {
        let metadata = BackupMetadata {
            version: "1".to_string(),
            backup_type: BackupType::Full,
            created_at: SystemTime::now(),
            source_path: "/test/db".to_string(),
            triple_count: 1000,
            dictionary_size: 500,
            size_bytes: 1024 * 1024,
            compressed: true,
            checksum: "test_checksum".to_string(),
            parent_backup: None,
            wal_lsn: None,
            file_manifest: crate::backup::FileManifest::default(),
        };

        let record = CloudBackupRecord {
            backup_id: "test_backup".to_string(),
            metadata,
            cloud_path: "backups/test".to_string(),
            provider: CloudProviderType::S3,
            storage_class: CloudStorageClass::Standard,
            uploaded_at: SystemTime::now(),
            cloud_size_bytes: 1024 * 1024,
            checksum: "cloud_checksum".to_string(),
            encrypted: true,
            replicated: false,
            replicated_regions: vec![],
        };

        assert_eq!(record.backup_id, "test_backup");
        assert_eq!(record.provider, CloudProviderType::S3);
        assert!(record.encrypted);
    }

    #[test]
    fn test_cloud_storage_stats_default() {
        let stats = CloudStorageStats::default();

        assert_eq!(stats.total_uploads, 0);
        assert_eq!(stats.total_downloads, 0);
        assert_eq!(stats.bytes_uploaded, 0);
        assert_eq!(stats.bytes_downloaded, 0);
        assert_eq!(stats.failed_uploads, 0);
        assert_eq!(stats.failed_downloads, 0);
    }

    #[test]
    fn test_s3_backend_creation() {
        let config = CloudStorageConfig {
            provider: CloudProviderType::S3,
            ..Default::default()
        };

        let result = S3Backend::new(&config);
        assert!(result.is_ok());
    }

    #[test]
    fn test_gcs_backend_creation() {
        let config = CloudStorageConfig {
            provider: CloudProviderType::GCS,
            ..Default::default()
        };

        let result = GCSBackend::new(&config);
        assert!(result.is_ok());
    }

    #[test]
    fn test_azure_backend_creation() {
        let config = CloudStorageConfig {
            provider: CloudProviderType::Azure,
            ..Default::default()
        };

        let result = AzureBackend::new(&config);
        assert!(result.is_ok());
    }

    #[test]
    fn test_minio_backend_creation() {
        let config = CloudStorageConfig {
            provider: CloudProviderType::MinIO,
            ..Default::default()
        };

        let result = MinIOBackend::new(&config);
        assert!(result.is_ok());
    }
}