Improve notifications, fix styles not being added

Based on https://petr.codes/blog/rails/modern-rails-flash-messages/part-3/

app/javascript/application.js

@@ -1,3 +1,3 @@
 // Configure your import map in config/importmap.rb. Read more: https://github.com/rails/importmap-rails
 import "@hotwired/turbo-rails"
-// import "controllers"
+import "controllers"

app/javascript/controllers/hello_controller.js

@@ -1,7 +0,0 @@
-import { Controller } from "@hotwired/stimulus"
-
-export default class extends Controller {
-  connect() {
-    this.element.textContent = "Hello World!"
-  }
-}

app/javascript/controllers/notification_controller.js

@@ -0,0 +1,110 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  static targets = ["buttons", "countdown"]
+
+  connect() {
+    const timeoutSeconds = parseInt(this.data.get("timeout"));
+
+    setTimeout(() => {
+      this.element.classList.remove('hidden');
+      this.element.classList.add('notification-enter', 'notification-enter-from');
+
+      // Trigger transition
+      setTimeout(() => {
+        this.element.classList.add('notification-enter-to');
+      }, 100);
+
+      // Trigger countdown
+      if (this.hasCountdownTarget) {
+        this.countdownTarget.style.animation = 'notification-countdown linear ' + timeoutSeconds + 's';
+      }
+
+    }, 500);
+    this.timeoutId = setTimeout(() => {
+      this.close();
+    }, timeoutSeconds * 1000 + 500);
+  }
+
+  run(e) {
+    e.preventDefault();
+    this.stop();
+    let _this = this;
+    this.buttonsTarget.innerHTML = '<span class="text-sm leading-5 font-medium text-grey-700">Processing...</span>';
+
+    // Call the action
+    fetch(this.data.get("action-url"), {
+      method: this.data.get("action-method").toUpperCase(),
+      dataType: 'script',
+      credentials: "include",
+      headers: {
+        "X-CSRF-Token": this.csrfToken
+      },
+    })
+      .then(response => {
+        if (!response.ok) {
+          throw Error(response.statusText);
+        }
+        return response;
+      })
+      .then(response => response.json())
+      .then(data => {
+        // Set new content
+        _this.buttonsTarget.innerHTML = '<span class="text-sm leading-5 font-medium text-green-700">' + data.message + '</span>';
+
+        // Remove hidden class and display the record
+        if (data.inline) {
+          document.getElementById(data.dom_id).classList.toggle('hidden');
+        }
+
+        // Close
+        setTimeout(() => {
+          if (data.inline) {
+            // Just close the notification
+            _this.close();
+          } else {
+            // Reload the page using Turbo
+            window.Turbo.visit(window.location.toString(), {action: 'replace'})
+          }
+        }, 1000);
+      })
+      .catch(error => {
+        console.log(error);
+        _this.buttonsTarget.innerHTML = '<span class="text-sm leading-5 font-medium text-red-700">Error!</span>';
+        setTimeout(() => {
+          _this.close();
+        }, 1000);
+      });
+  }
+
+  stop() {
+    clearTimeout(this.timeoutId)
+    this.timeoutId = null
+  }
+
+  continue() {
+    this.timeoutId = setTimeout(() => {
+      this.close();
+    }, parseInt(this.data.get("timeout")));
+  }
+
+  close() {
+    this.element.classList.remove('notification-enter', 'notification-enter-from', 'notification-enter-to');
+    this.element.classList.add('notification-leave', 'notification-leave-from')
+
+    // Trigger transition
+    setTimeout(() => {
+      this.element.classList.add('notification-leave-to');
+    }, 100);
+
+    // Remove element after transition
+    setTimeout(() => {
+      this.element.remove();
+    }, 300);
+  }
+
+  get csrfToken() {
+    const element = document.head.querySelector('meta[name="csrf-token"]')
+    return element.getAttribute("content")
+  }
+}