Add getDescription to Services

src/services/service.ts

@@ -946,7 +946,45 @@ export default class Services {
     }
   }
 
+  async getDescription(processId: string, process: Process): Promise<string | null> {
+    const service = await Services.getInstance();
+    // Get the `commited_in` value of the last state and remove it from the array
+    const currentCommitedIn = process.states.at(-1)?.commited_in;
+    console.log('Current CommitedIn:' currentCommitedIn)
   
+    if (currentCommitedIn === undefined) {
+      return null; // No states available
+    }
+  
+    // Find the last state where `commited_in` is different
+    let lastDifferentState = process.states.findLast(
+      state => state.commited_in !== currentCommitedIn
+    );
+  
+    if (!lastDifferentState) {
+      // It means that we only have one state that is not commited yet, that can happen with process we just created
+      // let's assume that the right description is in the last concurrent state and not handle the (arguably rare) case where we have multiple concurrent states on a creation
+      lastDifferentState = process.states.at(-1);
+    }
+
+    if (!lastDifferentState.pcd_commitment) {
+      return null;
+    }
+  
+    // Take the description out of the state, if any
+    const description = lastDifferentState!.pcd_commitment['description'];
+    if (description) {
+      const userDiff = await service.getDiffByValue(description);
+      if (userDiff) {
+        console.log("Successfully retrieved userDiff:", userDiff);
+        return userDiff.new_value;
+      } else {
+        console.log("Failed to retrieve a non-null userDiff.");
+      }
+    }
+  
+    return null;
+  }
 
   getNotifications(): any[] | null {
     // return [