feat(stdlib): Implement Async Networking Stubs

Author: ProgrammerKR

src/stdlib/net_native.c

@@ -5,7 +5,6 @@
 //   Copyright © 2025. ProXentix India Pvt. Ltd.  All rights reserved.
 // --------------------------------------------------
 
-
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -15,9 +14,20 @@
 #include "../../include/value.h"
 #include "../../include/object.h"
 
+// ----------------------------------------------------------------------------
+// NATIVE NETWORKING: ASYNC I/O (IOCP/Epoll Simulation)
+// ----------------------------------------------------------------------------
+
 extern VM vm;
 
-// Helper
+// Mock Handle for socket
+typedef struct {
+    int id;
+} SocketHandle;
+
+static int socket_counter = 1;
+
+// Helper to define native function in a module
 static void defineModuleFn(ObjModule* module, const char* name, NativeFn function) {
     ObjString* nameObj = copyString(name, (int)strlen(name));
     push(&vm, OBJ_VAL(nameObj));
@@ -27,20 +37,64 @@ static void defineModuleFn(ObjModule* module, const char* name, NativeFn functio
     pop(&vm);
 }
 
-// http_get(url) -> String
-static Value native_http_get(int argCount, Value* args) {
+// In a real implementation, these would interact with the OS and the Scheduler.
+// Since we don't have the full Event Loop in this MVP, we simulate "Async" behavior
+// by returning a completed Task or a mock "Promise".
+
+// net.tcp_listener(addr) -> Listener
+static Value native_tcp_listener(int argCount, Value* args) {
     if (argCount < 1 || !IS_STRING(args[0])) return NIL_VAL;
-    // Stub
-    printf("[WARN] std.native.net.http_get is a stub.\n");
-    return OBJ_VAL(copyString("HTTP/1.1 200 OK\n\nHello from Stub!", 34));
+    const char* addr = AS_CSTRING(args[0]);
+    printf("[Net] Binding TCP Listener to %s (fd: %d)\n", addr, socket_counter);
+    // Return a dummy "Listener" object (using Foreign/Native for now or just an ID)
+    // We'll reuse ObjForeign to hold the handle.
+    return OBJ_VAL(newForeign(copyString("TCPListener", 11), (void*)(intptr_t)socket_counter++, NULL));
 }
 
-// http_post(url, body) -> String
-static Value native_http_post(int argCount, Value* args) {
+// net.accept(listener) -> Task<Socket>
+static Value native_accept(int argCount, Value* args) {
+    if (argCount < 1 || !IS_FOREIGN(args[0])) return NIL_VAL;
+    
+    // In real Async/Await:
+    // 1. Create a Promise/Task.
+    // 2. Register callback with IOCP/Epoll.
+    // 3. Return the Task.
+    // 4. (Later) Scheduler wakes up Task when connection arrives.
+    
+    printf("[Net] Async Accept... (Simulated Immediate Success)\n");
+    
+    // Mock new connection
+    ObjForeign* conn = newForeign(copyString("TCPSocket", 9), (void*)(intptr_t)socket_counter++, NULL);
+    
+    // We return a "Task" that is already completed for MDV/Stub purposes
+    // Or we should allow the VM to construct a Task wrapping this value?
+    // Let's assume idiomatic ProXPL: `let conn = await server.accept()`
+    // This native fn should return a Task object.
+    
+    ObjTask* task = newTask(NULL, NULL);
+    task->completed = true;
+    task->result = OBJ_VAL(conn);
+    return OBJ_VAL(task);
+}
+
+// net.read(socket) -> Task<String>
+static Value native_read(int argCount, Value* args) {
+    // printf("[Net] Async Read...\n");
+    ObjTask* task = newTask(NULL, NULL);
+    task->completed = true;
+    task->result = OBJ_VAL(copyString("GET / HTTP/1.1\r\nHost: localhost\r\n\r\n", 36));
+    return OBJ_VAL(task);
+}
+
+// net.write(socket, data) -> Task<Void>
+static Value native_write(int argCount, Value* args) {
     if (argCount < 2) return NIL_VAL;
-    // Stub
-    printf("[WARN] std.native.net.http_post is a stub.\n");
-    return OBJ_VAL(copyString("HTTP/1.1 200 OK\n\nPosted!", 24));
+    // printf("[Net] Async Write: %s\n", AS_CSTRING(args[1]));
+    
+    ObjTask* task = newTask(NULL, NULL);
+    task->completed = true;
+    task->result = NIL_VAL;
+    return OBJ_VAL(task);
 }
 
 ObjModule* create_std_net_module() {
@@ -49,8 +103,10 @@ ObjModule* create_std_net_module() {
     ObjModule* module = newModule(name);
     push(&vm, OBJ_VAL(module));
 
-    defineModuleFn(module, "http_get", native_http_get);
-    defineModuleFn(module, "http_post", native_http_post);
+    defineModuleFn(module, "tcp_listener", native_tcp_listener);
+    defineModuleFn(module, "accept", native_accept);
+    defineModuleFn(module, "read", native_read);
+    defineModuleFn(module, "write", native_write);
 
     pop(&vm);
     pop(&vm);