import { ResourceLoader } from "@common-module/ts";
import AudioContextManager from "../sound/AudioContextManager.js";

class AudioBufferLoader extends ResourceLoader<AudioBuffer> {
  protected async loadResource(src: string): Promise<AudioBuffer | undefined> {
    const loadPromise = (async () => {
      const response = await fetch(src);
      if (!response.ok) throw new Error(`Failed to load audio data: ${src}`);

      const arrayBuffer = await response.arrayBuffer();
      const audioBuffer = await AudioContextManager.getAudioContext()
        .decodeAudioData(arrayBuffer);

      this.pendingLoads.delete(src);

      if (this.isResourceInUse(src)) {
        if (this.resources.has(src)) {
          throw new Error(`Audio buffer already exists: ${src}`);
        } else {
          this.resources.set(src, audioBuffer);
          return audioBuffer;
        }
      } else {
        return undefined;
      }
    })();

    this.pendingLoads.set(src, loadPromise);
    return await loadPromise;
  }
}

export default new AudioBufferLoader();