Implement a basic suitable ui with a model of what could happen in the backend.

backend_model.py

@@ -0,0 +1,89 @@
+import time
+import threading
+from enum import Enum
+from pydantic import BaseModel, Field
+from typing import Optional, List
+
+class AnnouncementStates(Enum):
+    IDLE: str = "Ready"
+    TRANSLATING: str = "Translating"
+    GENERATING_VOICE: str = "Generating voice synthesis"
+    ROUTING: str = "Routing to endpoints"
+    ACTIVE: str = "Broadcasting announcement"
+    COMPLETE: str = "Complete"
+    ERROR: str = "Error"
+
+class AnnouncementDetails(BaseModel):
+    text: str
+    languages: List[str]
+    group: str
+    endpoints: List[str]
+    start_time: float
+
+class AnnouncementProgress(BaseModel):
+    current_state: str = AnnouncementStates.IDLE
+    error: Optional[str] = None
+    details: AnnouncementDetails
+    progress: float = Field(default=0.0, ge=0.0, le=1.0)
+    description: str = Field(default="Ready")
+
+class AnnouncementSystem:
+    def __init__(self):
+        self.current_process = AnnouncementProgress(
+            details=AnnouncementDetails(
+                text="",
+                languages=[],
+                endpoints=[],
+                group="",
+                start_time=0.0
+            )
+        )
+        self._thread = None
+        
+    
+    def start_announcement(self, text, group):
+        if self.current_process.current_state not in [AnnouncementStates.IDLE, AnnouncementStates.COMPLETE]:
+            raise Exception("Announcement already in progress")
+            
+        self.current_process.details.text = text
+        self.current_process.details.group = group
+        self._thread = threading.Thread(target=self._run_process)
+        self._thread.start()
+    
+    def _run_process(self):
+        self.current_process.details.start_time = time.time()
+        try:
+            self._update_state(AnnouncementStates.TRANSLATING)
+            time.sleep(2)  # Simulate translation
+            
+            self._update_state(AnnouncementStates.GENERATING_VOICE)
+            time.sleep(1.5)  # Voice synthesis
+            
+            self._update_state(AnnouncementStates.ROUTING)
+            time.sleep(len(self.current_process.details.endpoints) * 0.5)
+            
+            self._update_state(AnnouncementStates.ACTIVE)
+            time.sleep(3)  # Simulate broadcast
+            
+            self._update_state(AnnouncementStates.COMPLETE)
+            
+        except Exception as e:
+            self.current_process.error = str(e)
+            self._update_state(AnnouncementStates.ERROR)
+    
+    def _update_state(self, new_state):
+        self.current_process.current_state = new_state
+        
+        # Progress based on state transitions
+        state_progress = {
+            AnnouncementStates.TRANSLATING: 0.25,
+            AnnouncementStates.GENERATING_VOICE: 0.5,
+            AnnouncementStates.ROUTING: 0.75,
+            AnnouncementStates.ACTIVE: 1.0,
+            AnnouncementStates.COMPLETE: 1.0,
+            AnnouncementStates.ERROR: 1.0
+        }
+        self.current_process.progress = state_progress[new_state]
+
+# Singleton instance
+announcement_system = AnnouncementSystem()