Updated delete command for M2 (#6525)

* Updated delete command for M2

* removed unused variable

src/commands/frameworks-backends-delete.ts

@@ -5,30 +5,73 @@ import { FirebaseError } from "../error";
 import * as gcp from "../gcp/frameworks";
 import { promptOnce } from "../prompt";
 import * as utils from "../utils";
+import { logger } from "../logger";
+import { DEFAULT_REGION, ALLOWED_REGIONS } from "../init/features/frameworks/constants";
+const Table = require("cli-table");
+
+const COLUMN_LENGTH = 20;
+const TABLE_HEAD = [
+  "Backend Id",
+  "Repository Name",
+  "Location",
+  "URL",
+  "Created Date",
+  "Updated Date",
+];
 
 export const command = new Command("backends:delete")
   .description("Delete a backend from a Firebase project")
-  .option("-l, --location <location>", "App Backend location", "us-central1")
-  .option("-s, --backendId <backendId>", "Backend Id", "")
+  .option("-l, --location <location>", "App Backend location", "")
+  .option("-s, --backend <backend>", "Backend Id", "")
   .withForce()
   .action(async (options: Options) => {
     const projectId = needProjectId(options);
-    const location = options.location as string;
-    const backendId = options.backendId as string;
+    let location = options.location as string;
+    const backendId = options.backend as string;
     if (!backendId) {
       throw new FirebaseError("Backend id can't be empty.");
     }
+
+    if (!location) {
+      location = await promptOnce({
+        name: "region",
+        type: "list",
+        default: DEFAULT_REGION,
+        message: "Please select the region of the backend you'd like to delete:",
+        choices: ALLOWED_REGIONS,
+      });
+    }
+
+    const table = new Table({
+      head: TABLE_HEAD,
+      style: { head: ["green"] },
+    });
+    table.colWidths = COLUMN_LENGTH;
+
+    let backend;
+    try {
+      backend = await gcp.getBackend(projectId, location, backendId);
+      populateTable(backend, table);
+    } catch (err: any) {
+      throw new FirebaseError(`No backends found with given parameters. Command aborted.`, {
+        original: err,
+      });
+    }
+
+    utils.logWarning("You are about to permanently delete the backend:");
+    logger.info(table.toString());
+
     const confirmDeletion = await promptOnce(
       {
         type: "confirm",
         name: "force",
         default: false,
-        message: "You are about to delete the backend with id: " + backendId + "\n  Are you sure?",
+        message: "Are you sure?",
       },
       options
     );
     if (!confirmDeletion) {
-      throw new FirebaseError("Deletion aborted.");
+      throw new FirebaseError("Deletion Aborted");
     }
 
     try {
@@ -40,4 +83,27 @@ export const command = new Command("backends:delete")
         { original: err }
       );
     }
+
+    return backend;
+  });
+
+function populateTable(backend: gcp.Backend, table: any) {
+  const [location, , backendId] = backend.name.split("/").slice(3, 6);
+  const entry = [
+    backendId,
+    backend.codebase.repository?.split("/").pop(),
+    location,
+    backend.uri,
+    backend.createTime,
+    backend.updateTime,
+  ];
+  const newRow = entry.map((name) => {
+    const maxCellWidth = COLUMN_LENGTH - 2;
+    const chunks = [];
+    for (let i = 0; name && i < name.length; i += maxCellWidth) {
+      chunks.push(name.substring(i, i + maxCellWidth));
+    }
+    return chunks.join("\n");
   });
+  table.push(newRow);
+}