feat: add services package

packages/services/src/Domain/Status/StatusService.ts

@@ -0,0 +1,62 @@
+import { removeFromArray } from '@standardnotes/utils'
+import { AbstractService } from '../Service/AbstractService'
+import { StatusServiceEvent, StatusServiceInterface, StatusMessageIdentifier } from './StatusServiceInterface'
+
+/* istanbul ignore file */
+
+export class StatusService extends AbstractService<StatusServiceEvent, string> implements StatusServiceInterface {
+  private _message = ''
+  private directSetMessage?: string
+  private dynamicMessages: string[] = []
+
+  get message(): string {
+    return this._message
+  }
+
+  setMessage(message: string | undefined): void {
+    this.directSetMessage = message
+    this.recomputeMessage()
+  }
+
+  addMessage(message: string): StatusMessageIdentifier {
+    this.dynamicMessages.push(message)
+
+    this.recomputeMessage()
+
+    return message
+  }
+
+  removeMessage(message: StatusMessageIdentifier): void {
+    removeFromArray(this.dynamicMessages, message)
+
+    this.recomputeMessage()
+  }
+
+  private recomputeMessage(): void {
+    const messages = [...this.dynamicMessages]
+
+    if (this.directSetMessage) {
+      messages.unshift(this.directSetMessage)
+    }
+
+    this._message = this.messageFromArray(messages)
+
+    void this.notifyEvent(StatusServiceEvent.MessageChanged, this._message)
+  }
+
+  private messageFromArray(messages: string[]): string {
+    let message = ''
+
+    messages.forEach((value, index) => {
+      const isLast = index === messages.length - 1
+
+      message += value
+
+      if (!isLast) {
+        message += ', '
+      }
+    })
+
+    return message
+  }
+}