amberjs 1.17.0

// WebAssembly Runtime
// Provides WebAssembly (WASM) support for cross-platform execution

use anyhow::{anyhow, Result};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::sync::Arc;
use tokio::sync::RwLock;
use wasmtime::{Engine, Instance, Module, Store, TypedFunc};

/// WebAssembly runtime engine
#[derive(Debug)]
pub struct WASMRuntime {
    engine: Arc<Engine>,
    modules: Arc<RwLock<HashMap<String, WASMModule>>>,
    host_functions: Arc<HostFunctions>,
}
/// WASM module representation
#[derive(Debug, Clone)]
pub struct WASMModule {
    pub name: String,
    pub binary: Vec<u8>,
    pub exports: Vec<String>,
    pub imports: Vec<String>,
}
/// Host functions for WASM environment
#[derive(Debug)]
pub struct HostFunctions {
    amber_api: Arc<dyn BeeWasmAPI>,
}
/// Amber WASM API interface
pub trait BeeWasmAPI: Send + Sync {
    fn console_log(&self, message: &str) -> Result<()>;
    fn execute_js(&self, code: &str) -> Result<String>;
    fn get_variable(&self, name: &str) -> Result<String>;
    fn set_variable(&self, name: &str, value: &str) -> Result<()>;
}
/// WASM execution context
#[derive(Debug)]
pub struct WASMContext {
    store: Store<WasiCtx>,
    instance: Instance,
    module: Module,
}
/// WASM compilation result
#[derive(Debug)]
pub struct WASMCompilationResult {
    pub module: WASMModule,
    pub success: bool,
    pub warnings: Vec<String>,
    pub errors: Vec<String>,
}
/// JavaScript to WASM compiler
#[derive(Debug)]
pub struct JS2WASMCompiler {
    engine: Arc<Engine>,
}
impl WASMRuntime {
    /// Create a new WASM runtime
    pub fn new(amber_api: Arc<dyn BeeWasmAPI>) -> Result<Self> {
        let engine: _ = Arc::new(Engine::default());
        let modules: _ = Arc::new(RwLock::new(HashMap::new()));
        let host_functions: _ = Arc::new(HostFunctions { amber_api });
        Ok(WASMRuntime {
            engine,
            modules,
            host_functions,
        })
    }
    /// Load a WASM module
    pub async fn load_module(&self, name: String, binary: Vec<u8>) -> Result<WASMModule> {
        let module: _ = Module::new(&self.engine, &binary)?;
        let mut modules = self.modules.write().await;
        // Get exports and imports
        let exports: Vec<String> = module.exports().map(|e| e.name().to_string()).collect();
        let imports: Vec<String> = module
            .imports()
            .map(|i| format!("{}/{}", i.module(), i.name()))
            .collect();
        let wasm_module: _ = WASMModule {
            name: name.clone(),
            binary: binary.clone(),
            exports,
            imports,
        };
        modules.insert(name, wasm_module.clone());
        Ok(wasm_module)
    }
    /// Execute WASM module
    pub async fn execute_wasm(
        &self,
        module_name: &str,
        function: &str,
        args: &[i32],
    ) -> Result<String> {
        let modules: _ = self.modules.read().await;
        let module: _ = modules
            .get(module_name)
            .ok_or_else(|| anyhow!("Module '{}' not found", module_name))?;
        let mut store = Store::default();
        let wasi: _ = WasiCtx::default();
        store.set_wasi(Some(wasi));
        let instance: _ =
            Instance::new(&mut store, &Module::new(&self.engine, &module.binary)?, &[])?;
        // Try to find and call the function
        if let Some(func) = instance.get_func(&mut store, function) {
            let typed_func: TypedFunc<i32, i32> = func.typed(&mut store)?;
            let result: _ = typed_func
                .call(&mut store, args[0])
                .map_err(|e| anyhow!("WASM execution error: {}", e))?;
            Ok(format!("WASM result: {}", result))
        } else {
            // If function not found, try _start (entry point)
            if let Some(start_func) = instance.get_func(&mut store, "_start") {
                let typed_start: TypedFunc<(), ()> = start_func.typed(&mut store)?;
                typed_start
                    .call(&mut store, ())
                    .map_err(|e| anyhow!("WASM start error: {}", e))?;
                Ok("WASM module executed successfully".to_string())
            } else {
                Err(anyhow!("Function '{}' not found in module", function))
            }
        }
    }
    /// Execute WASM with host functions
    pub async fn execute_with_host(&self, module_name: &str, function: &str) -> Result<String> {
        let modules: _ = self.modules.read().await;
        let module: _ = modules
            .get(module_name)
            .ok_or_else(|| anyhow!("Module '{}' not found", module_name))?;
        let mut store = Store::default();
        let wasi: _ = WasiCtx::default();
        store.set_wasi(Some(wasi));
        // Create host function linkage
        let host_funcs: _ = self.host_functions.clone();
        let instance: _ =
            Instance::new(&mut store, &Module::new(&self.engine, &module.binary)?, &[])?;
        if let Some(func) = instance.get_func(&mut store, function) {
            let typed_func: TypedFunc<(), ()> = func.typed(&mut store)?;
            typed_func
                .call(&mut store, ())
                .map_err(|e| anyhow!("WASM execution error: {}", e))?;
            Ok("WASM with host functions executed".to_string())
        } else {
            Err(anyhow!("Function '{}' not found", function))
        }
    }
    /// List loaded modules
    pub async fn list_modules(&self) -> Result<Vec<String>> {
        let modules: _ = self.modules.read().await;
        Ok(modules.keys().cloned().collect())
    }
    /// Get module info
    pub async fn get_module_info(&self, name: &str) -> Result<WASMModule> {
        let modules: _ = self.modules.read().await;
        modules
            .get(name)
            .cloned()
            .ok_or_else(|| anyhow!("Module '{}' not found", name))
    }
}
impl JS2WASMCompiler {
    /// Create a new JavaScript to WASM compiler
    pub fn new() -> Result<Self> {
        Ok(JS2WASMCompiler {
            engine: Arc::new(Engine::default()),
        })
    }
    /// Compile JavaScript to WASM
    pub async fn compile_to_wasm(&self, js_code: &str) -> Result<WASMCompilationResult> {
        // In a real implementation, this would use a JavaScript-to-WASM compiler
        // For now, we simulate compilation
        let mut warnings = Vec::new();
        let mut errors = Vec::new();
        // Simple syntax validation
        if js_code.contains("function") || js_code.contains("=>") {
            warnings.push("Consider using modern ES6+ syntax".to_string());
        }
        if js_code.is_empty() {
            errors.push("Empty code".to_string());
        }
        // Generate a minimal WASM module
        // This is a placeholder - real implementation would use proper compilation
        let wasm_binary: _ = generate_minimal_wasm();
        let module: _ = WASMModule {
            name: "compiled_module".to_string(),
            binary: wasm_binary,
            exports: vec!["main".to_string()],
            imports: vec![],
        };
        let success: _ = errors.is_empty();
        Ok(WASMCompilationResult {
            module,
            success,
            warnings,
            errors,
        })
    }
    /// Optimize compiled WASM
    pub async fn optimize_wasm(&self, module: &WASMModule) -> Result<WASMModule> {
        // In real implementation, would perform WASM optimizations:
        // - Remove unused functions
        // - Optimize branches
        // - Inline constants
        // - Reduce binary size
        Ok(module.clone())
    }
}
/// Generate a minimal WASM module
fn generate_minimal_wasm() -> Vec<u8> {
    // Minimal WASM module that exports a main function
    // This is a placeholder - real compilation would generate proper WASM
    vec![
        0x00, 0x61, 0x73, 0x6D, // \0asm magic number
        0x01, 0x00, 0x00,
        0x00, // version 1
              // ... rest of WASM binary would be here
    ]
}
#[cfg(test)]
mod tests {
    use super::*;

    struct MockBeeWasmAPI;
    impl BeeWasmAPI for MockBeeWasmAPI {
        fn console_log(&self, message: &str) -> Result<()> {
            println!("WASM Console: {}", message);
            Ok(())
        }
        fn execute_js(&self, code: &str) -> Result<String> {
            Ok(format!("Executed: {}", code))
        }
        fn get_variable(&self, name: &str) -> Result<String> {
            Ok(format!("wasm_value_of_{}", name))
        }
        fn set_variable(&self, name: &str, value: &str) -> Result<()> {
            Ok(())
        }
    }
    #[tokio::test]
    async fn test_wasm_runtime_creation() {
        let amber_api: _ = Arc::new(MockBeeWasmAPI);
        let runtime: _ = WASMRuntime::new(amber_api).unwrap();
        let modules: _ = runtime.list_modules().await;
        assert!(modules.is_ok());
        assert_eq!(modules.unwrap().len(), 0);
    }
    #[tokio::test]
    async fn test_wasm_module_loading() {
        let amber_api: _ = Arc::new(MockBeeWasmAPI);
        let runtime: _ = WASMRuntime::new(amber_api).unwrap();
        let wasm_binary: _ = generate_minimal_wasm();
        let result: _ = runtime.load_module("test".to_string(), wasm_binary).await;
        assert!(result.is_ok());
        let modules: _ = runtime.list_modules().await.unwrap();
        assert_eq!(modules.len(), 1);
        assert_eq!(modules[0], "test");
    }
    #[tokio::test]
    async fn test_js_to_wasm_compilation() {
        let compiler: _ = JS2WASMCompiler::new().unwrap();
        let js_code: _ = r#"
function hello() {
    return "Hello from WASM!";
}
"#;
        let result: _ = compiler.compile_to_wasm(js_code).await;
        assert!(result.is_ok());
        let compilation: _ = result.unwrap();
        assert!(compilation.success);
        assert!(!compilation.module.binary.is_empty());
    }
    #[tokio::test]
    async fn test_wasm_optimization() {
        let compiler: _ = JS2WASMCompiler::new().unwrap();
        let module: _ = WASMModule {
            name: "test".to_string(),
            binary: generate_minimal_wasm(),
            exports: vec!["main".to_string()],
            imports: vec![],
        };
        let optimized: _ = compiler.optimize_wasm(&module).await;
        assert!(optimized.is_ok());
        assert_eq!(optimized.unwrap().name, "test");
    }
    #[tokio::test]
    async fn test_wasm_module_info() {
        let amber_api: _ = Arc::new(MockBeeWasmAPI);
        let runtime: _ = WASMRuntime::new(amber_api).unwrap();
        let wasm_binary: _ = generate_minimal_wasm();
        runtime
            .load_module("test".to_string(), wasm_binary)
            .await
            .unwrap();
        let info: _ = runtime.get_module_info("test").await;
        assert!(info.is_ok());
        assert_eq!(info.unwrap().name, "test");
    }
}