wasm-sandbox 0.1.0

//! Wasmer runtime implementation - minimal stub for dyn-compatibility demo

use std::any::Any;
use std::sync::RwLock;
use std::collections::HashMap;

// Removed unused import

use crate::error::{Error, Result};
use crate::runtime::{
    ModuleId, RuntimeConfig, RuntimeMetrics, WasmInstanceState,
    WasmInstance, WasmModule, WasmRuntime, WasmFunctionCaller
};
use crate::security::{Capabilities, ResourceLimits};

/// Minimal Wasmer module implementation - stub for dyn-compatibility
/// This is a placeholder implementation showing that multiple runtimes can be trait objects
pub struct WasmerModule {
    id: ModuleId,
    metadata: HashMap<String, String>,
}

impl WasmModule for WasmerModule {
    fn id(&self) -> ModuleId {
        self.id
    }

    fn name(&self) -> Option<&str> {
        None
    }

    fn exports(&self) -> Vec<String> {
        Vec::new()
    }

    fn size(&self) -> usize {
        0
    }

    fn clone_module(&self) -> Box<dyn WasmModule> {
        Box::new(WasmerModule {
            id: self.id,
            metadata: self.metadata.clone(),
        })
    }

    fn as_any(&self) -> &dyn Any {
        self
    }
}

/// Minimal Wasmer instance implementation - stub for dyn-compatibility
pub struct WasmerInstance {
    module_id: ModuleId,
}

impl WasmInstance for WasmerInstance {
    fn state(&self) -> WasmInstanceState {
        WasmInstanceState::Created
    }

    fn memory_usage(&self) -> usize {
        0
    }

    fn fuel_usage(&self) -> Option<u64> {
        None
    }

    fn reset_fuel(&self) -> Result<()> {
        Ok(())
    }

    fn add_fuel(&self, _fuel: u64) -> Result<()> {
        Ok(())
    }

    unsafe fn memory_ptr(&self) -> Result<*mut u8> {
        Err(Error::InstanceCreation("Wasmer runtime is not fully implemented - use Wasmtime instead".to_string()))
    }

    fn memory_size(&self) -> usize {
        0
    }

    fn function_caller(&self) -> Box<dyn WasmFunctionCaller> {
        Box::new(WasmerInstance { module_id: self.module_id })
    }

    fn call_simple_function(&self, _function_name: &str, _params: &[i32]) -> Result<i32> {
        Err(Error::InstanceCreation("Wasmer runtime is not fully implemented - use Wasmtime instead".to_string()))
    }
}

impl WasmFunctionCaller for WasmerInstance {
    fn call_function_json(
        &self,
        _function_name: &str,
        _params_json: &str,
    ) -> Result<String> {
        Err(Error::InstanceCreation("Wasmer runtime is not fully implemented - use Wasmtime instead".to_string()))
    }

    fn call_function_msgpack(
        &self,
        _function_name: &str,
        _params_msgpack: &[u8],
    ) -> Result<Vec<u8>> {
        Err(Error::InstanceCreation("Wasmer runtime is not fully implemented - use Wasmtime instead".to_string()))
    }

    fn as_any(&self) -> &dyn Any {
        self
    }
}

/// Minimal Wasmer runtime implementation - stub for dyn-compatibility
/// This is a placeholder implementation showing that multiple runtimes can be trait objects
pub struct WasmerRuntime {
    /// Runtime metrics
    metrics: RwLock<RuntimeMetrics>,
}

impl WasmerRuntime {
    /// Create a new Wasmer runtime
    pub fn new() -> Result<Self> {
        let metrics = RuntimeMetrics {
            compiled_modules: 0,
            active_instances: 0,
            total_memory_usage: 0,
            peak_memory_usage: 0,
            fuel_consumption_rate: None,
            cache_hit_rate: None,
            last_compilation_time_ms: None,
        };
        
        Ok(Self {
            metrics: RwLock::new(metrics),
        })
    }
}

impl WasmRuntime for WasmerRuntime {
    fn initialize(&mut self, _config: RuntimeConfig) -> Result<()> {
        // Stub implementation
        Ok(())
    }
    
    fn load_module(&self, _wasm_bytes: &[u8]) -> Result<Box<dyn WasmModule>> {
        // Stub implementation - not actually using Wasmer APIs
        let module = WasmerModule {
            id: ModuleId::new(),
            metadata: HashMap::new(),
        };
        Ok(Box::new(module))
    }
    
    fn get_module(&self, id: ModuleId) -> Result<std::sync::Arc<dyn WasmModule>> {
        Err(Error::ModuleNotFound(id.to_string()))
    }
    
    fn get_module_ids(&self) -> Vec<ModuleId> {
        Vec::new()
    }
    
    fn create_instance(
        &self,
        module: &dyn WasmModule,
        _resource_limits: ResourceLimits,
        _capabilities: Capabilities,
    ) -> Result<Box<dyn WasmInstance>> {
        // Stub implementation
        Ok(Box::new(WasmerInstance {
            module_id: module.id(),
        }))
    }
    
    fn get_metrics(&self) -> RuntimeMetrics {
        self.metrics.read().unwrap().clone()
    }
    
    fn shutdown(&self) -> Result<()> {
        // Stub implementation
        Ok(())
    }
}