import { useContext, useEffect, useState } from "react";
import { DomainContext } from "../../domainContext";
import getApi from "../../lib/useApi";

export type Mp3Response = {
  media: HTMLMediaElement | null;
  loading: boolean;
  error: string | null;
  getNow: () => void;
  audioDeleted: boolean | null;
};

const useMp3 = (transcriptId: string, waiting?: boolean): Mp3Response => {
  const [media, setMedia] = useState<HTMLMediaElement | null>(null);
  const [later, setLater] = useState(waiting);
  const [audioLoading, setAudioLoading] = useState<boolean>(true);
  const [audioLoadingError, setAudioLoadingError] = useState<null | string>(null);
  const [transcriptMetadataLoading, setTranscriptMetadataLoading] = useState<boolean>(true);
  const [transcriptMetadataLoadingError, setTranscriptMetadataLoadingError] = useState<string | null>(null);
  const [audioDeleted, setAudioDeleted] = useState<boolean | null>(null);
  const api = getApi();
  const { api_url } = useContext(DomainContext);
  const accessTokenInfo = api?.httpRequest?.config?.TOKEN;

  const [serviceWorker, setServiceWorker] =
    useState<ServiceWorkerRegistration | null>(null);

  useEffect(() => {
    if ("serviceWorker" in navigator) {
      navigator.serviceWorker.register("/service-worker.js").then((worker) => {
        setServiceWorker(worker);
      });
    }
    return () => {
      serviceWorker?.unregister();
    };
  }, []);

  useEffect(() => {
    if (!navigator.serviceWorker) return;
    if (!navigator.serviceWorker.controller) return;
    if (!serviceWorker) return;
    // Send the token to the service worker
    navigator.serviceWorker.controller.postMessage({
      type: "SET_AUTH_TOKEN",
      token: accessTokenInfo,
    });
  }, [navigator.serviceWorker, !serviceWorker, accessTokenInfo]);

  useEffect(() => {
    if (!transcriptId || !api || later) return;


    setTranscriptMetadataLoading(true);
    
    const audioElement = document.createElement("audio");
    audioElement.src = `${api_url}/v1/transcripts/${transcriptId}/audio/mp3`;
    audioElement.crossOrigin = "anonymous";
    audioElement.preload = "auto";
    
    const handleCanPlay = () => {
      setAudioLoading(false);
      setAudioLoadingError(null);
    };
    
    const handleError = () => {
      setAudioLoading(false);
      setAudioLoadingError("Failed to load audio");
    };
    
    audioElement.addEventListener('canplay', handleCanPlay);
    audioElement.addEventListener('error', handleError);
    
    setMedia(audioElement);


    setAudioLoading(true);

    let stopped = false;
    // Fetch transcript info in parallel
    api.v1TranscriptGet({ transcriptId })
      .then((transcript) => {
        if (stopped) return;
        setAudioDeleted(transcript.audio_deleted || false);
        setTranscriptMetadataLoadingError(null);
      })
      .catch((error) => {
        if (stopped) return;
        console.error("Failed to fetch transcript:", error);
        setAudioDeleted(null);
        setTranscriptMetadataLoadingError(error.message);
      })
      .finally(() => {
        if (stopped) return;
        setTranscriptMetadataLoading(false);
      })
    
    return () => {
      stopped = true;
      audioElement.removeEventListener('canplay', handleCanPlay);
      audioElement.removeEventListener('error', handleError);
    };
  }, [transcriptId, !api, later, api_url]);

  const getNow = () => {
    setLater(false);
  };

  const loading = audioLoading || transcriptMetadataLoading;
  const error = audioLoadingError || transcriptMetadataLoadingError;

  return { media, loading, error, getNow, audioDeleted };
};

export default useMp3;