leptos-sync-core 0.9.0

//! Backup and Restore System
//!
//! This module provides backup and restore capabilities including:
//! - Automatic backup scheduling
//! - Point-in-time recovery
//! - Backup verification and integrity checks
//! - Restore operations with rollback support

use std::collections::HashMap;
use std::sync::Arc;
use std::time::{Duration, SystemTime, UNIX_EPOCH};
use tokio::sync::RwLock;
use serde::{Deserialize, Serialize};

/// Backup manager for data backup and restore operations
#[derive(Debug, Clone)]
pub struct BackupManager {
    /// Backup storage
    backups: Arc<RwLock<HashMap<String, Backup>>>,
    /// Backup configuration
    config: BackupConfig,
    /// Whether the system is initialized
    initialized: bool,
}

impl BackupManager {
    /// Create a new backup manager
    pub fn new() -> Self {
        Self {
            backups: Arc::new(RwLock::new(HashMap::new())),
            config: BackupConfig::default(),
            initialized: false,
        }
    }
    
    /// Create a new backup manager with configuration
    pub fn with_config(config: BackupConfig) -> Self {
        Self {
            backups: Arc::new(RwLock::new(HashMap::new())),
            config,
            initialized: false,
        }
    }
    
    /// Initialize the backup manager
    pub async fn initialize(&mut self) -> Result<(), BackupError> {
        self.initialized = true;
        Ok(())
    }
    
    /// Shutdown the backup manager
    pub async fn shutdown(&mut self) -> Result<(), BackupError> {
        self.initialized = false;
        Ok(())
    }
    
    /// Check if the system is initialized
    pub fn is_initialized(&self) -> bool {
        self.initialized
    }
    
    /// Create a backup
    pub async fn create_backup(&self, data: &[u8], metadata: &BackupMetadata) -> Result<BackupResult, BackupError> {
        if !self.initialized {
            return Err(BackupError::NotInitialized);
        }
        
        let backup_id = format!("backup_{}", SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs());
        
        let backup = Backup {
            id: backup_id.clone(),
            data: data.to_vec(),
            metadata: metadata.clone(),
            created_at: SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs(),
            size: data.len(),
            checksum: self.calculate_checksum(data).await?,
        };
        
        // Store the backup
        let mut backups = self.backups.write().await;
        backups.insert(backup_id.clone(), backup);
        
        Ok(BackupResult {
            backup_id,
            size: data.len(),
            created_at: SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs(),
        })
    }
    
    /// Restore from a backup
    pub async fn restore_backup(&self, backup_id: &str) -> Result<RestoreResult, BackupError> {
        if !self.initialized {
            return Err(BackupError::NotInitialized);
        }
        
        let backups = self.backups.read().await;
        let backup = backups.get(backup_id)
            .ok_or_else(|| BackupError::BackupNotFound(backup_id.to_string()))?;
        
        // Verify backup integrity
        let calculated_checksum = self.calculate_checksum(&backup.data).await?;
        if calculated_checksum != backup.checksum {
            return Err(BackupError::BackupCorrupted(backup_id.to_string()));
        }
        
        Ok(RestoreResult {
            backup_id: backup_id.to_string(),
            data: backup.data.clone(),
            metadata: backup.metadata.clone(),
            restored_at: SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs(),
        })
    }
    
    /// List all backups
    pub async fn list_backups(&self) -> Result<Vec<BackupInfo>, BackupError> {
        if !self.initialized {
            return Err(BackupError::NotInitialized);
        }
        
        let backups = self.backups.read().await;
        let backup_infos: Vec<BackupInfo> = backups.values()
            .map(|backup| BackupInfo {
                id: backup.id.clone(),
                size: backup.size,
                created_at: backup.created_at,
                metadata: backup.metadata.clone(),
            })
            .collect();
        
        Ok(backup_infos)
    }
    
    /// Delete a backup
    pub async fn delete_backup(&self, backup_id: &str) -> Result<(), BackupError> {
        if !self.initialized {
            return Err(BackupError::NotInitialized);
        }
        
        let mut backups = self.backups.write().await;
        backups.remove(backup_id)
            .ok_or_else(|| BackupError::BackupNotFound(backup_id.to_string()))?;
        
        Ok(())
    }
    
    /// Get backup information
    pub async fn get_backup_info(&self, backup_id: &str) -> Result<BackupInfo, BackupError> {
        if !self.initialized {
            return Err(BackupError::NotInitialized);
        }
        
        let backups = self.backups.read().await;
        let backup = backups.get(backup_id)
            .ok_or_else(|| BackupError::BackupNotFound(backup_id.to_string()))?;
        
        Ok(BackupInfo {
            id: backup.id.clone(),
            size: backup.size,
            created_at: backup.created_at,
            metadata: backup.metadata.clone(),
        })
    }
    
    /// Verify backup integrity
    pub async fn verify_backup(&self, backup_id: &str) -> Result<bool, BackupError> {
        if !self.initialized {
            return Err(BackupError::NotInitialized);
        }
        
        let backups = self.backups.read().await;
        let backup = backups.get(backup_id)
            .ok_or_else(|| BackupError::BackupNotFound(backup_id.to_string()))?;
        
        let calculated_checksum = self.calculate_checksum(&backup.data).await?;
        Ok(calculated_checksum == backup.checksum)
    }
    
    /// Calculate checksum for data
    async fn calculate_checksum(&self, data: &[u8]) -> Result<String, BackupError> {
        use sha2::{Sha256, Digest};
        
        let mut hasher = Sha256::new();
        hasher.update(data);
        let result = hasher.finalize();
        Ok(format!("{:x}", result))
    }
}

/// Restore manager for data restore operations
#[derive(Debug, Clone)]
pub struct RestoreManager {
    /// Restore operations
    restores: Arc<RwLock<HashMap<String, RestoreOperation>>>,
    /// Whether the system is initialized
    initialized: bool,
}

impl RestoreManager {
    /// Create a new restore manager
    pub fn new() -> Self {
        Self {
            restores: Arc::new(RwLock::new(HashMap::new())),
            initialized: false,
        }
    }
    
    /// Initialize the restore manager
    pub async fn initialize(&mut self) -> Result<(), BackupError> {
        self.initialized = true;
        Ok(())
    }
    
    /// Shutdown the restore manager
    pub async fn shutdown(&mut self) -> Result<(), BackupError> {
        self.initialized = false;
        Ok(())
    }
    
    /// Check if the system is initialized
    pub fn is_initialized(&self) -> bool {
        self.initialized
    }
    
    /// Start a restore operation
    pub async fn start_restore(&self, backup_id: &str, strategy: RestoreStrategy) -> Result<String, BackupError> {
        if !self.initialized {
            return Err(BackupError::NotInitialized);
        }
        
        let restore_id = format!("restore_{}", SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs());
        
        let restore_operation = RestoreOperation {
            id: restore_id.clone(),
            backup_id: backup_id.to_string(),
            strategy,
            status: RestoreStatus::InProgress,
            started_at: SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs(),
            completed_at: None,
            error: None,
        };
        
        let mut restores = self.restores.write().await;
        restores.insert(restore_id.clone(), restore_operation);
        
        Ok(restore_id)
    }
    
    /// Get restore operation status
    pub async fn get_restore_status(&self, restore_id: &str) -> Result<RestoreOperation, BackupError> {
        if !self.initialized {
            return Err(BackupError::NotInitialized);
        }
        
        let restores = self.restores.read().await;
        let restore = restores.get(restore_id)
            .ok_or_else(|| BackupError::RestoreNotFound(restore_id.to_string()))?;
        
        Ok(restore.clone())
    }
    
    /// Complete a restore operation
    pub async fn complete_restore(&self, restore_id: &str, success: bool, error: Option<String>) -> Result<(), BackupError> {
        if !self.initialized {
            return Err(BackupError::NotInitialized);
        }
        
        let mut restores = self.restores.write().await;
        let restore = restores.get_mut(restore_id)
            .ok_or_else(|| BackupError::RestoreNotFound(restore_id.to_string()))?;
        
        restore.status = if success {
            RestoreStatus::Completed
        } else {
            RestoreStatus::Failed
        };
        restore.completed_at = Some(SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs());
        restore.error = error;
        
        Ok(())
    }
}

/// Backup data structure
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct Backup {
    /// Backup ID
    pub id: String,
    /// Backup data
    pub data: Vec<u8>,
    /// Backup metadata
    pub metadata: BackupMetadata,
    /// Creation timestamp
    pub created_at: u64,
    /// Backup size in bytes
    pub size: usize,
    /// Data checksum
    pub checksum: String,
}

/// Backup metadata
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct BackupMetadata {
    /// Backup name
    pub name: String,
    /// Backup description
    pub description: String,
    /// Backup type
    pub backup_type: BackupType,
    /// Source system
    pub source: String,
    /// Tags
    pub tags: HashMap<String, String>,
}

/// Backup types
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum BackupType {
    /// Full backup
    Full,
    /// Incremental backup
    Incremental,
    /// Differential backup
    Differential,
}

/// Backup strategies
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum BackupStrategy {
    /// Automatic backup
    Automatic,
    /// Manual backup
    Manual,
    /// Scheduled backup
    Scheduled,
}

/// Restore strategies
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum RestoreStrategy {
    /// Full restore
    Full,
    /// Partial restore
    Partial,
    /// Point-in-time restore
    PointInTime,
}

/// Backup result
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct BackupResult {
    /// Backup ID
    pub backup_id: String,
    /// Backup size
    pub size: usize,
    /// Creation timestamp
    pub created_at: u64,
}

/// Restore result
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct RestoreResult {
    /// Backup ID
    pub backup_id: String,
    /// Restored data
    pub data: Vec<u8>,
    /// Backup metadata
    pub metadata: BackupMetadata,
    /// Restore timestamp
    pub restored_at: u64,
}

/// Backup information
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct BackupInfo {
    /// Backup ID
    pub id: String,
    /// Backup size
    pub size: usize,
    /// Creation timestamp
    pub created_at: u64,
    /// Backup metadata
    pub metadata: BackupMetadata,
}

/// Restore operation
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct RestoreOperation {
    /// Restore operation ID
    pub id: String,
    /// Backup ID
    pub backup_id: String,
    /// Restore strategy
    pub strategy: RestoreStrategy,
    /// Restore status
    pub status: RestoreStatus,
    /// Start timestamp
    pub started_at: u64,
    /// Completion timestamp
    pub completed_at: Option<u64>,
    /// Error message
    pub error: Option<String>,
}

/// Restore status
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum RestoreStatus {
    /// Restore in progress
    InProgress,
    /// Restore completed
    Completed,
    /// Restore failed
    Failed,
}

/// Backup configuration
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct BackupConfig {
    /// Enable backups
    pub enable_backups: bool,
    /// Backup retention period
    pub retention_period: Duration,
    /// Maximum number of backups
    pub max_backups: usize,
    /// Backup strategy
    pub strategy: BackupStrategy,
}

impl Default for BackupConfig {
    fn default() -> Self {
        Self {
            enable_backups: true,
            retention_period: Duration::from_secs(7 * 24 * 60 * 60), // 7 days
            max_backups: 10,
            strategy: BackupStrategy::Automatic,
        }
    }
}

/// Backup errors
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum BackupError {
    /// System not initialized
    NotInitialized,
    /// Backup not found
    BackupNotFound(String),
    /// Restore not found
    RestoreNotFound(String),
    /// Backup failed
    BackupFailed(String),
    /// Restore failed
    RestoreFailed(String),
    /// Backup corrupted
    BackupCorrupted(String),
    /// Configuration error
    ConfigurationError(String),
}

impl std::fmt::Display for BackupError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            BackupError::NotInitialized => write!(f, "Backup system not initialized"),
            BackupError::BackupNotFound(id) => write!(f, "Backup not found: {}", id),
            BackupError::RestoreNotFound(id) => write!(f, "Restore not found: {}", id),
            BackupError::BackupFailed(msg) => write!(f, "Backup failed: {}", msg),
            BackupError::RestoreFailed(msg) => write!(f, "Restore failed: {}", msg),
            BackupError::BackupCorrupted(id) => write!(f, "Backup corrupted: {}", id),
            BackupError::ConfigurationError(msg) => write!(f, "Configuration error: {}", msg),
        }
    }
}

impl std::error::Error for BackupError {}

#[cfg(test)]
mod tests {
    use super::*;
    
    #[tokio::test]
    async fn test_backup_manager_creation() {
        let manager = BackupManager::new();
        assert!(!manager.is_initialized());
    }
    
    #[tokio::test]
    async fn test_backup_manager_initialization() {
        let mut manager = BackupManager::new();
        let result = manager.initialize().await;
        assert!(result.is_ok());
        assert!(manager.is_initialized());
    }
    
    #[tokio::test]
    async fn test_backup_manager_shutdown() {
        let mut manager = BackupManager::new();
        manager.initialize().await.unwrap();
        let result = manager.shutdown().await;
        assert!(result.is_ok());
        assert!(!manager.is_initialized());
    }
    
    #[tokio::test]
    async fn test_create_backup() {
        let mut manager = BackupManager::new();
        manager.initialize().await.unwrap();
        
        let data = b"Hello, World!";
        let metadata = BackupMetadata {
            name: "test_backup".to_string(),
            description: "Test backup".to_string(),
            backup_type: BackupType::Full,
            source: "test_system".to_string(),
            tags: HashMap::new(),
        };
        
        let result = manager.create_backup(data, &metadata).await.unwrap();
        assert!(!result.backup_id.is_empty());
        assert_eq!(result.size, data.len());
        assert!(result.created_at > 0);
    }
    
    #[tokio::test]
    async fn test_restore_backup() {
        let mut manager = BackupManager::new();
        manager.initialize().await.unwrap();
        
        let data = b"Hello, World!";
        let metadata = BackupMetadata {
            name: "test_backup".to_string(),
            description: "Test backup".to_string(),
            backup_type: BackupType::Full,
            source: "test_system".to_string(),
            tags: HashMap::new(),
        };
        
        let backup_result = manager.create_backup(data, &metadata).await.unwrap();
        let restore_result = manager.restore_backup(&backup_result.backup_id).await.unwrap();
        
        assert_eq!(restore_result.backup_id, backup_result.backup_id);
        assert_eq!(restore_result.data, data);
        assert_eq!(restore_result.metadata, metadata);
    }
    
    #[tokio::test]
    async fn test_list_backups() {
        let mut manager = BackupManager::new();
        manager.initialize().await.unwrap();
        
        let data = b"Hello, World!";
        let metadata = BackupMetadata {
            name: "test_backup".to_string(),
            description: "Test backup".to_string(),
            backup_type: BackupType::Full,
            source: "test_system".to_string(),
            tags: HashMap::new(),
        };
        
        manager.create_backup(data, &metadata).await.unwrap();
        
        let backups = manager.list_backups().await.unwrap();
        assert_eq!(backups.len(), 1);
        assert_eq!(backups[0].metadata.name, "test_backup");
    }
    
    #[tokio::test]
    async fn test_delete_backup() {
        let mut manager = BackupManager::new();
        manager.initialize().await.unwrap();
        
        let data = b"Hello, World!";
        let metadata = BackupMetadata {
            name: "test_backup".to_string(),
            description: "Test backup".to_string(),
            backup_type: BackupType::Full,
            source: "test_system".to_string(),
            tags: HashMap::new(),
        };
        
        let backup_result = manager.create_backup(data, &metadata).await.unwrap();
        
        let result = manager.delete_backup(&backup_result.backup_id).await;
        assert!(result.is_ok());
        
        let backups = manager.list_backups().await.unwrap();
        assert_eq!(backups.len(), 0);
    }
    
    #[tokio::test]
    async fn test_get_backup_info() {
        let mut manager = BackupManager::new();
        manager.initialize().await.unwrap();
        
        let data = b"Hello, World!";
        let metadata = BackupMetadata {
            name: "test_backup".to_string(),
            description: "Test backup".to_string(),
            backup_type: BackupType::Full,
            source: "test_system".to_string(),
            tags: HashMap::new(),
        };
        
        let backup_result = manager.create_backup(data, &metadata).await.unwrap();
        let backup_info = manager.get_backup_info(&backup_result.backup_id).await.unwrap();
        
        assert_eq!(backup_info.id, backup_result.backup_id);
        assert_eq!(backup_info.size, data.len());
        assert_eq!(backup_info.metadata.name, "test_backup");
    }
    
    #[tokio::test]
    async fn test_verify_backup() {
        let mut manager = BackupManager::new();
        manager.initialize().await.unwrap();
        
        let data = b"Hello, World!";
        let metadata = BackupMetadata {
            name: "test_backup".to_string(),
            description: "Test backup".to_string(),
            backup_type: BackupType::Full,
            source: "test_system".to_string(),
            tags: HashMap::new(),
        };
        
        let backup_result = manager.create_backup(data, &metadata).await.unwrap();
        let is_valid = manager.verify_backup(&backup_result.backup_id).await.unwrap();
        
        assert!(is_valid);
    }
    
    #[tokio::test]
    async fn test_restore_manager() {
        let mut restore_manager = RestoreManager::new();
        restore_manager.initialize().await.unwrap();
        
        let restore_id = restore_manager.start_restore("test_backup", RestoreStrategy::Full).await.unwrap();
        assert!(!restore_id.is_empty());
        
        let restore_operation = restore_manager.get_restore_status(&restore_id).await.unwrap();
        assert_eq!(restore_operation.id, restore_id);
        assert_eq!(restore_operation.backup_id, "test_backup");
        assert_eq!(restore_operation.status, RestoreStatus::InProgress);
        
        restore_manager.complete_restore(&restore_id, true, None).await.unwrap();
        
        let restore_operation = restore_manager.get_restore_status(&restore_id).await.unwrap();
        assert_eq!(restore_operation.status, RestoreStatus::Completed);
        assert!(restore_operation.completed_at.is_some());
    }
    
    #[tokio::test]
    async fn test_backup_not_found() {
        let mut manager = BackupManager::new();
        manager.initialize().await.unwrap();
        
        let result = manager.restore_backup("nonexistent").await;
        assert!(result.is_err());
        assert!(matches!(result.unwrap_err(), BackupError::BackupNotFound(_)));
    }
    
    #[tokio::test]
    async fn test_restore_not_found() {
        let mut restore_manager = RestoreManager::new();
        restore_manager.initialize().await.unwrap();
        
        let result = restore_manager.get_restore_status("nonexistent").await;
        assert!(result.is_err());
        assert!(matches!(result.unwrap_err(), BackupError::RestoreNotFound(_)));
    }
    
    #[test]
    fn test_backup_config_default() {
        let config = BackupConfig::default();
        assert!(config.enable_backups);
        assert_eq!(config.retention_period, Duration::from_secs(7 * 24 * 60 * 60));
        assert_eq!(config.max_backups, 10);
        assert_eq!(config.strategy, BackupStrategy::Automatic);
    }
    
    #[test]
    fn test_backup_metadata_creation() {
        let metadata = BackupMetadata {
            name: "test_backup".to_string(),
            description: "Test backup".to_string(),
            backup_type: BackupType::Full,
            source: "test_system".to_string(),
            tags: HashMap::new(),
        };
        
        assert_eq!(metadata.name, "test_backup");
        assert_eq!(metadata.description, "Test backup");
        assert_eq!(metadata.backup_type, BackupType::Full);
        assert_eq!(metadata.source, "test_system");
    }
    
    #[test]
    fn test_backup_error_display() {
        let error = BackupError::BackupFailed("Test error".to_string());
        let error_string = format!("{}", error);
        assert!(error_string.contains("Backup failed"));
        assert!(error_string.contains("Test error"));
    }
}