amberjs 1.17.0

// Offline Execution Engine
// Executes JavaScript/TypeScript scripts in offline mode with local caching

use serde::{Deserialize, Serialize};
use std::collections::{BTreeMap, HashMap};
use std::sync::{Arc, Mutex, RwLock};
use super::local_cache::::{LocalCodeCache, OfflineDataStore};
use tokio::time::{TokioDuration, TokioInstant};
use std::time::{Duration, Instant};
use std::time::SystemTime;

/// Offline execution engine
#[derive(Debug)]
pub struct OfflineExecutionEngine {
    runtime: Arc<RwLock<Option<OfflineRuntime>>>,
    local_cache: Arc<LocalCodeCache>,
    data_store: Arc<OfflineDataStore>,
    dependency_resolver: Arc<DependencyResolver>,
    sync_manager: Arc<super::local_cache::SyncManager>,
}
/// Offline runtime instance
#[derive(Debug)]
pub struct OfflineRuntime {
    pub instance_id: String,
    pub initialized_at: std::time::SystemTime,
    pub loaded_modules: Vec<String>,
}
/// Execution result from offline mode
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExecutionResult {
    pub success: bool,
    pub output: Option<String>,
    pub error: Option<String>,
    pub execution_time_ms: u64,
    pub cached_modules_used: u32,
}
/// Dependency information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Dependency {
    pub name: String,
    pub version: String,
    pub source: DependencySource,
    pub size_bytes: u64,
}
/// Source of a dependency
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub enum DependencySource {
    LocalCache,
    Bundled,
    External,
}
/// Dependency resolution result
#[derive(Debug)]
pub struct ResolutionResult {
    pub dependencies: Vec<Dependency>,
    pub resolution_time_ms: u64,
    pub cached_count: u32,
    pub bundled_count: u32,
}
/// Module loader
#[derive(Debug)]
pub struct ModuleLoader {
    cache: Arc<LocalCodeCache>,
    bundled_modules: Vec<String>,
}
impl OfflineExecutionEngine {
    /// Create a new offline execution engine
    pub async fn new(
        local_cache: LocalCodeCache,
        data_store: OfflineDataStore,
    ) -> Result<Self> {
        let engine: _ = OfflineExecutionEngine {
            runtime: Arc::new(Mutex::new(None)))
            local_cache: Arc::new(Mutex::new(local_cache)))
            data_store: Arc::new(Mutex::new(data_store)))
            dependency_resolver: Arc::new(Mutex::new(DependencyResolver::new()))
            sync_manager: Arc::new(Mutex::new(super::local_cache::SyncManager::new()),.await?),
        };
        // Initialize runtime
        engine.initialize_runtime().await?;
        println!("Offline execution engine initialized");
        Ok(engine)
    }
    /// Get runtime reference
    pub fn runtime(&self) -> Option<&OfflineRuntime> {
        // This is a simplified getter - in real implementation, would need proper async handling
        None
    }
    /// Execute a script in offline mode
    pub async fn execute_offline(&self, script: &str) -> Result<ExecutionResult> {
        let start: _ = Instant::now();
        println!("Starting offline script execution...");
        // Resolve dependencies
        let resolution: _ = self.resolve_dependencies(script).await?;
        println!("Resolved {} dependencies", resolution.dependencies.len());
        // Load cached modules
        let cached_modules: _ = self.load_cached_modules(&resolution.dependencies).await?;
        // Initialize runtime if needed
        let mut runtime = self.runtime.write().await;
        if runtime.is_none() {
            *runtime = Some(self.create_runtime_instance().await?);
        }
        // Execute script
        let execution_result: _ = self.execute_script_internal(script, &cached_modules).await?;
        let elapsed: _ = start.elapsed();
        let result: _ = ExecutionResult {
            success: execution_result.success,
            output: execution_result.output,
            error: execution_result.error,
            execution_time_ms: elapsed.as_millis() as u64,
            cached_modules_used: cached_modules.len() as u32,
        };
        println!("Offline execution completed in {}ms", result.execution_time_ms);
        Ok(result)
    }
    /// Execute script with fallback to online mode
    pub async fn execute_with_fallback(&self, script: &str) -> Result<ExecutionResult> {
        // Try offline execution first
        match self.execute_offline(script).await {
            Ok(result) => {
                if result.success {
                    return Ok(result);
                }
                println!("Offline execution failed, falling back to online mode");
            }
            Err(e) => {
                println!("Offline execution error: {:?}, falling back to online mode", e);
            }
        }
        // Fallback to online execution (simplified)
        self.execute_online(script).await
    }
    /// Execute script in online mode (fallback)
    async fn execute_online(&self, script: &str) -> Result<ExecutionResult> {
        println!("Executing script in online mode...");
        tokio::time::sleep(Duration::from_millis(20)).await;
        Ok(ExecutionResult {
            success: true,
            output: Some("Executed in online mode".to_string()),
            error: None,
            execution_time_ms: 20,
            cached_modules_used: 0,
        })
    }
    /// Resolve dependencies for a script
    pub async fn resolve_dependencies(&self, script: &str) -> Result<ResolutionResult> {
        let start: _ = Instant::now();
        let dependencies: _ = self.dependency_resolver.resolve(script).await?;
        let elapsed: _ = start.elapsed();
        let cached_count: _ = dependencies.iter().filter(|d| d.source == DependencySource::LocalCache).count() as u32;
        let bundled_count: _ = dependencies.iter().filter(|d| d.source == DependencySource::Bundled).count() as u32;
        println!("Dependency resolution completed in {}ms", elapsed.as_millis());
        Ok(ResolutionResult {
            dependencies,
            resolution_time_ms: elapsed.as_millis() as u64,
            cached_count,
            bundled_count,
        })
    }
    /// Load modules from cache
    async fn load_cached_modules(&self, dependencies: &[Dependency]) -> Result<Vec<String> {
        let mut loaded_modules = Vec::new();
        for dep in dependencies {
            if dep.source == DependencySource::LocalCache {
                if let Some(script) = self.local_cache.load_script(&dep.name).await? {
                    loaded_modules.push(script.content);
                    println!("Loaded cached module: {}", dep.name);
                }
            } else if dep.source == DependencySource::Bundled {
                // Load bundled module
                loaded_modules.push(format!("// Bundled module: {}", dep.name));
                println!("Loaded bundled module: {}", dep.name);
            }
        }
        Ok(loaded_modules)
    }
    /// Initialize the offline runtime
    async fn initialize_runtime(&self) -> Result<()> {
        println!("Initializing offline runtime...");
        tokio::time::sleep(Duration::from_millis(10)).await;
        Ok(())
    }
    /// Create a new runtime instance
    async fn create_runtime_instance(&self) -> Result<OfflineRuntime> {
        let instance: _ = OfflineRuntime {
            instance_id: format!("offline-runtime-{}", uuid::Uuid::new_v4()),
            initialized_at: std::time::SystemTime::now(),
            loaded_modules: Vec::new(),
        };
        println!("Created offline runtime instance: {}", instance.instance_id);
        Ok(instance)
    }
    /// Internal script execution
    async fn execute_script_internal(&self, script: &str, modules: &[String]) -> Result<ExecutionResult> {
        // Simulate script execution
        let start: _ = Instant::now();
        tokio::time::sleep(Duration::from_millis(10)).await;
        // In real implementation, this would:
        // 1. Set up V8 isolate
        // 2. Load modules
        // 3. Execute script
        // 4. Return result
        let output: _ = Some(format!(
            "Executed script with {} modules in {}ms",
            modules.len(),
            start.elapsed().as_millis());
        Ok(ExecutionResult {
            success: true,
            output,
            error: None,
            execution_time_ms: start.elapsed().as_millis() as u64,
            cached_modules_used: modules.len() as u32,
        })
    }
    /// Get sync manager
    pub fn sync_manager(&self) -> Arc<super::local_cache::SyncManager> {
        self.sync_manager.clone()
    }
    /// Preload dependencies
    pub async fn preload_dependencies(&self, dependencies: &[String]) -> Result<()> {
        println!("Preloading {} dependencies...", dependencies.len());
        for dep_name in dependencies {
            // Check if already cached
            if let Some(_) = self.local_cache.load_script(dep_name).await? {
                continue;
            }
            // In real implementation, would fetch and cache the dependency
            println!("Preloaded dependency: {}", dep_name);
            tokio::time::sleep(Duration::from_millis(5)).await;
        }
        Ok(())
    }
}
/// Dependency resolver
#[derive(Debug)]
pub struct DependencyResolver {
    builtin_modules: Vec<String>,
}
impl DependencyResolver {
    /// Create a new dependency resolver
    pub fn new() -> Self {
        DependencyResolver {
            builtin_modules: vec![
                "console".to_string(),
                "fs".to_string(),
                "path".to_string(),
                "util".to_string(),
                "crypto".to_string(),
                "events".to_string(),
                "stream".to_string(),
                "buffer".to_string(),
            ],
        }
    }
    /// Resolve dependencies from a script
    pub async fn resolve(&self, script: &str) -> Result<Vec<Dependency> {
        let mut dependencies = Vec::new();
        // Simple dependency extraction (in real implementation, use proper parsing)
        for module in &self.builtin_modules {
            if script.contains(&format!("require('{}')", module))
                || script.contains(&format!("require(\"{}\")", module))
                || script.contains(&format!("import {}", module))
                || script.contains(&format!("from '{}'", module)) {
                dependencies.push(Dependency {
                    name: module.clone(),
                    version: "1.0.0".to_string(),
                    source: DependencySource::Bundled,
                    size_bytes: 1024,
                });
            }
        }
        // Check for external dependencies
        let external_patterns: _ = ["lodash", "axios", "moment", "express"];
        for pattern in &external_patterns {
            if script.contains(pattern) {
                dependencies.push(Dependency {
                    name: pattern.to_string(),
                    version: "1.0.0".to_string(),
                    source: DependencySource::LocalCache,
                    size_bytes: 2048,
                });
            }
        }
        // Simulate resolution time
        tokio::time::sleep(Duration::from_millis(5)).await;
        Ok(dependencies)
    }
}
impl Default for OfflineExecutionEngine {
    fn default() -> Self {
        // This is a placeholder - real implementation would need proper initialization
        panic!("OfflineExecutionEngine must be initialized with new()")
    }
}