from fastapi import FastAPI, WebSocket, WebSocketDisconnect
from urllib.parse import urlparse, parse_qsl
from transcribe.whisper_llm_serve import WhisperTranscriptionService
from uuid import uuid1
from logging import getLogger
import numpy as np
from transcribe.translatepipes import TranslatePipes
from contextlib import asynccontextmanager
from multiprocessing import Process, freeze_support
from fastapi.staticfiles import StaticFiles
from fastapi.responses import RedirectResponse
import os
from transcribe.utils import pcm_bytes_to_np_array
logger = getLogger(__name__)


async def get_audio_from_websocket(websocket)->np.array:
    """
    Receives audio buffer from websocket and creates a numpy array out of it.

    Args:
        websocket: The websocket to receive audio from.

    Returns:
        A numpy array containing the audio.
    """
    frame_data = await websocket.receive_bytes()
    if frame_data == b"END_OF_AUDIO":
        return False
    return pcm_bytes_to_np_array(frame_data)


@asynccontextmanager
async def lifespan(app:FastAPI):
    global pipe
    pipe = TranslatePipes()
    pipe.wait_ready()
    logger.info("Pipeline is ready.")
    yield


# 获取当前文件所在目录的绝对路径
BASE_DIR = os.path.dirname(os.path.abspath(__file__))
# 构建frontend目录的绝对路径
FRONTEND_DIR = os.path.join(BASE_DIR, "frontend")


app = FastAPI(lifespan=lifespan)
app.mount("/app", StaticFiles(directory=FRONTEND_DIR, html=True), name="frontend")
pipe = None

@app.get("/")
async def root():
    return RedirectResponse(url="/app/")

@app.websocket("/ws")
async def translate(websocket: WebSocket):
    query_parameters_dict = websocket.query_params
    from_lang, to_lang = query_parameters_dict.get('from'), query_parameters_dict.get('to')
    
    client = WhisperTranscriptionService(
        websocket,
        pipe,
        language="en",
        client_uid=f"{uuid1()}",
    )


    if from_lang and to_lang:
        client.set_language(from_lang, to_lang)
        logger.info(f"Source lange: {from_lang}  -> Dst lange: {to_lang}")
        await websocket.accept()
    try:
        while True:
            frame_data = await get_audio_from_websocket(websocket)
            client.add_frames(frame_data)
    except WebSocketDisconnect:
        return 

if __name__ == '__main__':
    freeze_support()
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=9191)