"use strict";

function getMediaSession() {
  if (typeof window === "undefined") return undefined;
  return window.navigator?.mediaSession;
}

/**
 * video.js store interface — the subset MediaSession needs.
 */

export class MediaSessionHandler {
  enabled = false;
  constructor(store) {
    this.store = store;
  }
  enable() {
    const mediaSession = getMediaSession();
    if (!mediaSession) return;
    this.enabled = true;
    const defaultSkipTime = 15;
    const actionHandlers = [["play", () => {
      this.store.play();
    }], ["pause", () => {
      this.store.pause();
    }], ["stop", () => {
      this.store.pause();
      this.store.seek(0);
    }], ["seekbackward", details => {
      const offset = details.seekOffset || defaultSkipTime;
      this.store.seek(Math.max(0, this.store.currentTime - offset));
    }], ["seekforward", details => {
      const offset = details.seekOffset || defaultSkipTime;
      this.store.seek(Math.min(this.store.duration, this.store.currentTime + offset));
    }], ["seekto", details => {
      const seekTime = details.seekTime;
      if (seekTime != null) this.store.seek(seekTime);
    }]];
    for (const [action, handler] of actionHandlers) {
      try {
        mediaSession.setActionHandler(action, handler);
      } catch {
        // Action not supported by browser
      }
    }

    // Subscribe to store for playback state and position updates
    const unsubscribe = this.store.subscribe(() => {
      mediaSession.playbackState = this.store.paused ? "paused" : "playing";
      if ("setPositionState" in mediaSession && Number.isFinite(this.store.duration)) {
        try {
          mediaSession.setPositionState({
            duration: this.store.duration,
            playbackRate: this.store.playbackRate,
            position: this.store.currentTime
          });
        } catch {
          // position > duration can throw
        }
      }
    });
    this.disable = () => {
      this.enabled = false;
      unsubscribe();
      mediaSession.metadata = null;
      for (const [action] of actionHandlers) {
        try {
          mediaSession.setActionHandler(action, null);
        } catch {}
      }
    };
  }
  disable() {}
  updateMediaSession(metadata) {
    const mediaSession = getMediaSession();
    if (!mediaSession) return;
    if (!metadata) {
      mediaSession.metadata = null;
      return;
    }
    mediaSession.metadata = new window.MediaMetadata({
      title: metadata.title,
      album: metadata.subtitle,
      artist: metadata.artist,
      artwork: metadata.imageUri ? [{
        src: metadata.imageUri
      }] : []
    });
  }
}
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