Finish ACKs

server.c

@@ -65,7 +65,7 @@ static void handle_hearbeat_timeouts(Client_t *clients, int client_count, int se
     }
     sem_op.sem_op = 1;
     semop(semaphore_id, &sem_op, 1);
-    sleep(HEARTBEAT_TIMEOUT);
+    sleep(1);
   }
 }
 
@@ -85,6 +85,11 @@ int main(int argc, char **argv) {
   Client_t *clients = shmat(clients_memory_id, NULL, 0);
   Group_t *groups = malloc(sizeof(Group_t) * group_count);
 
+  // Temporary buffer for ACK_DELIVERs
+  // This could be larger and if there are even more clients in a group it won't be good so let's hope there won't be
+  saved_message_t message_buffer[20] = {0};
+  int message_buffer_count = 0;
+
   int semaphore_id = semget(IPC_PRIVATE, 1, IPC_CREAT | 0666);
   semctl(semaphore_id, 0, SETVAL, 1);
 
@@ -294,8 +299,8 @@ int main(int argc, char **argv) {
           }
 
           if (has_muted_group) {
-            printf("Group message to %s blocked (group %s is muted)\n",
-                   target_group->members[i]->nickname, target_group->name);
+            printf("Group message to %s blocked (group %s is muted)\n", target_group->members[i]->nickname,
+                   target_group->name);
             continue;
           }
 
@@ -346,7 +351,7 @@ int main(int argc, char **argv) {
 
         if (is_muted) {
           printf("Message from %s to %s blocked (muted)\n", client->nickname, target_client->nickname);
-          continue;  // Skip this recipient, discard the message
+          continue; // Skip this recipient, discard the message
         }
 
         // Check if the target is online or not, if they are not, store the message
@@ -367,7 +372,7 @@ int main(int argc, char **argv) {
           strncpy(saved_msg->sender, client->nickname, COMMAND_LENGTH);
           strncpy(saved_msg->message, msgbuf.message, MESSAGE_LENGTH);
           msgbuf_t response = {
-              .mtype = Message,
+              .mtype = Signal,
               .stype = ACK_ACCEPTED,
           };
           send(client->queue_id, &response);
@@ -380,10 +385,20 @@ int main(int argc, char **argv) {
             .mtype = Message,
             .sender = "",
         };
+        get_id(forward_msg.command);
         strncpy(forward_msg.sender, client->nickname, COMMAND_LENGTH);
         strncpy(forward_msg.message, msgbuf.message, MESSAGE_LENGTH);
         send(target_client->queue_id, &forward_msg);
 
+        // Add to message buffer for tracking ACK_DELIVERED
+        if (message_buffer_count < 20) {
+          saved_message_t *buffered = &message_buffer[message_buffer_count++];
+          strncpy(buffered->message_id, forward_msg.command, COMMAND_LENGTH);
+          strncpy(buffered->sender, client->id, COMMAND_LENGTH);
+          strncpy(buffered->command, target_client->id, COMMAND_LENGTH);
+          strncpy(buffered->message, msgbuf.message, MESSAGE_LENGTH);
+        }
+
         forward_msg.stype = ACK_ACCEPTED;
         forward_msg.mtype = Signal;
         send(client->queue_id, &forward_msg);
@@ -588,16 +603,12 @@ int main(int argc, char **argv) {
 
       // Check if user is already in the group
       bool is_in_group = false;
-      printf("Group '%s' has %d member slots\n", target_group->name, target_group->client_count);
       for (int i = 0; i < target_group->client_count; i++) {
         if (target_group->members[i] != NULL) {
-          printf("  Slot %d: %s\n", i, target_group->members[i]->id);
           if (strncmp(client->id, target_group->members[i]->id, COMMAND_LENGTH) == 0) {
             is_in_group = true;
             break;
           }
-        } else {
-          printf("  Slot %d: NULL\n", i);
         }
       }
 
@@ -650,7 +661,6 @@ int main(int argc, char **argv) {
 
       Group_t *target_group = NULL;
       for (int i = 0; i < group_count; i++) {
-        printf("Comparing group[%d].name='%s' with command='%s'\n", i, groups[i].name, msgbuf.command);
         if (strcmp(groups[i].name, msgbuf.command) == 0) {
           target_group = &groups[i];
           break;
@@ -708,7 +718,7 @@ int main(int argc, char **argv) {
       // Check if muting a group (starts with #) or a user
       if (msgbuf.command[0] == '#') {
         // Muting a group
-        char *group_name = msgbuf.command + 1;  // Skip the #
+        char *group_name = msgbuf.command + 1; // Skip the #
 
         // Find the group
         Group_t *target_group = NULL;
@@ -863,11 +873,41 @@ int main(int argc, char **argv) {
       }
       break;
     }
-    case Signal:
-      // Signals are sent from server to client, not the other way around
-      // so we ignore them here lol
+    case Signal: {
+      // Handle the delivery signal from the recipent
+      int message_idx = -1;
+      if (msgbuf.stype == ACK_DELIVERED) {
+        for (int i = 0; i < message_buffer_count; i++) {
+          if (strncmp(msgbuf.command, message_buffer[i].message_id, COMMAND_LENGTH) == 0) {
+            message_idx = i;
+            break;
+          }
+        }
+        if (message_idx == -1)
+          continue;
+
+        saved_message_t *message = &message_buffer[message_idx];
+        
+        for (int i = 0; i < client_count; i++) {
+          if (strncmp(message->sender, clients[i].id, COMMAND_LENGTH) == 0) {
+            msgbuf_t ack = {.mtype = Signal, .stype = ACK_DELIVERED, .command = ""};
+
+            // Send the information to whom the message got delivered to
+            strncpy(ack.sender, msgbuf.sender, COMMAND_LENGTH);
+            send(clients[i].queue_id, &ack);
+            
+            // Remove from message buffer by shifting remaining elements
+            for (int j = message_idx; j < message_buffer_count - 1; j++) {
+              message_buffer[j] = message_buffer[j + 1];
+            }
+            message_buffer_count--;
+            break;
+          }
+        }
+      }
       break;
     }
+    }
   }
 
   return 0;