from typing import List, Annotated
from fastapi import APIRouter, Depends, HTTPException, UploadFile, File, Form

from app.models.speaker_models import Speaker, SpeakerResponse
from app.services.speaker_service import SpeakerManagementService

router = APIRouter(
    tags=["Speakers"],
    responses={404: {"description": "Not found"}},
)

# Dependency to get the speaker service instance
# This could be more sophisticated with a proper DI system later
def get_speaker_service():
    return SpeakerManagementService()

@router.get("/", response_model=List[Speaker])
async def get_all_speakers(
    service: Annotated[SpeakerManagementService, Depends(get_speaker_service)]
):
    """
    Retrieve all available speakers.
    """
    return service.get_speakers()

@router.post("/", response_model=SpeakerResponse, status_code=201)
async def create_new_speaker(
    name: Annotated[str, Form()],
    audio_file: Annotated[UploadFile, File()],
    service: Annotated[SpeakerManagementService, Depends(get_speaker_service)]
):
    """
    Add a new speaker.
    Requires speaker name (form data) and an audio sample file (file upload).
    """
    if not audio_file.filename:
        raise HTTPException(status_code=400, detail="No audio file provided.")
    if not audio_file.content_type or not audio_file.content_type.startswith("audio/"):
        raise HTTPException(status_code=400, detail="Invalid audio file type. Please upload a valid audio file (e.g., WAV, MP3).")

    try:
        new_speaker = await service.add_speaker(name=name, audio_file=audio_file)
        return SpeakerResponse(
            id=new_speaker.id,
            name=new_speaker.name,
            message="Speaker added successfully."
        )
    except HTTPException as e:
        # Re-raise HTTPExceptions from the service (e.g., file save error)
        raise e
    except Exception as e:
        # Catch-all for other unexpected errors
        raise HTTPException(status_code=500, detail=f"An unexpected error occurred: {str(e)}")


@router.get("/{speaker_id}", response_model=Speaker)
async def get_speaker_details(
    speaker_id: str,
    service: Annotated[SpeakerManagementService, Depends(get_speaker_service)]
):
    """
    Get details for a specific speaker by ID.
    """
    speaker = service.get_speaker_by_id(speaker_id)
    if not speaker:
        raise HTTPException(status_code=404, detail="Speaker not found")
    return speaker

@router.delete("/{speaker_id}", response_model=dict)
async def remove_speaker(
    speaker_id: str,
    service: Annotated[SpeakerManagementService, Depends(get_speaker_service)]
):
    """
    Delete a speaker by ID.
    """
    deleted = service.delete_speaker(speaker_id)
    if not deleted:
        raise HTTPException(status_code=404, detail="Speaker not found or could not be deleted.")
    return {"message": "Speaker deleted successfully"}