import { detect } from "detect-browser";
import fscreen from "fscreen";
import Hls from "hls.js";

export const isSafari = /^((?!chrome|android).)*safari/i.test(
  navigator.userAgent,
);

let cachedVolumeResult: boolean | null = null;
export async function canChangeVolume(): Promise<boolean> {
  if (cachedVolumeResult === null) {
    const timeoutPromise = new Promise<false>((resolve) => {
      setTimeout(() => resolve(false), 1e3);
    });
    const promise = new Promise<true>((resolve) => {
      const video = document.createElement("video");
      const handler = () => {
        video.removeEventListener("volumechange", handler);
        resolve(true);
      };

      video.addEventListener("volumechange", handler);

      video.volume = 0.5;
    });

    cachedVolumeResult = await Promise.race([promise, timeoutPromise]);
  }
  return cachedVolumeResult;
}

export function canFullscreenAnyElement(): boolean {
  return fscreen.fullscreenEnabled;
}

export function canWebkitFullscreen(): boolean {
  return canFullscreenAnyElement() || isSafari;
}

export function canFullscreen(): boolean {
  return canFullscreenAnyElement() || canWebkitFullscreen();
}

export function canPictureInPicture(): boolean {
  return "pictureInPictureEnabled" in document;
}

export function canWebkitPictureInPicture(): boolean {
  return "webkitSupportsPresentationMode" in document.createElement("video");
}

export function canPlayHlsNatively(video: HTMLVideoElement): boolean {
  if (Hls.isSupported()) return false; // no need to play natively
  return !!video.canPlayType("application/vnd.apple.mpegurl");
}

export type ExtensionDetectionResult =
  | "unknown" // unknown detection or weird browser
  | "firefox" // firefox extensions
  | "chrome" // chrome extension (could be chromium, but still works with chrome extensions)
  | "ios"; // ios, no extensions

export function detectExtensionInstall(): ExtensionDetectionResult {
  const res = detect();

  // not a browser or failed to detect
  if (res?.type !== "browser") return "unknown";

  if (res.name === "ios" || res.name === "ios-webview") return "ios";
  if (
    res.name === "chrome" ||
    res.name === "chromium-webview" ||
    res.name === "edge-chromium" ||
    res.name === "opera"
  )
    return "chrome";
  if (res.name === "firefox") return "firefox";
  return "unknown";
}