// Video region playback, retry, and source probe helpers.

var videoRegionLastGoodSrcCache = Object.create(null);
var videoRegionProbeStateCache = Object.create(null);
var videoRegionProbeTimerCache = Object.create(null);
var VIDEO_REGION_RETRY_DELAY_MS = 5000;

function getVideoRegionCacheKey(region) {
  return String(region && (region.regionKey || region.label) || '').trim();
}

function isDirectlyRenderableSource(src) {
  return /^(?:https?:)?\/\//i.test(src) || /^data:/i.test(src) || /^blob:/i.test(src) || /^\/media\//i.test(src);
}

function appendCacheBust(src, cacheBust) {
  var key = String(cacheBust || '').trim();
  var raw = String(src || '').trim();
  if (!raw || !key) {
    return raw;
  }
  return raw + (raw.indexOf('?') === -1 ? '?' : '&') + 'v=' + encodeURIComponent(key);
}

function getVideoSourceAvailability(src) {
  return videoRegionProbeStateCache[String(src || '').trim()] || null;
}

function setVideoSourceAvailability(src, available) {
  var key = String(src || '').trim();
  if (!key) {
    return;
  }
  videoRegionProbeStateCache[key] = {
    available: available === null ? null : Boolean(available),
    checkedAt: Date.now()
  };
}

function logVideoRegionStatus(message, details, level) {
  if (typeof logDebug === 'function') {
    logDebug(message, details || '', level || 'info');
  }
}

function triggerVideoRegionSourceRefresh() {
  if (typeof window.notifyVideoRegionSourceReady === 'function') {
    window.notifyVideoRegionSourceReady();
    return;
  }

  if (typeof videoRegionRenderVersion === 'number') {
    videoRegionRenderVersion += 1;
  }
  slideMarkupCache = Object.create(null);
  if (typeof showCurrent === 'function' && slides && slides.length) {
    showCurrent();
  }
}

function scheduleVideoSourceProbe(regionKey, src, isRetry) {
  var key = String(src || '').trim();
  if (!regionKey || !key || isDirectlyRenderableSource(key)) {
    if (key) {
      setVideoSourceAvailability(key, true);
    }
    return;
  }

  if (videoRegionProbeTimerCache[key]) {
    return;
  }

  if (!isRetry) {
    logVideoRegionStatus('Video source changed; probing mirrored file before swapping.', 'region=' + regionKey + ' src=' + key);
  } else {
    logVideoRegionStatus('Video source still unavailable; retrying mirrored file probe.', 'region=' + regionKey + ' src=' + key, 'warn');
  }

  videoRegionProbeTimerCache[key] = window.setTimeout(function () {
    delete videoRegionProbeTimerCache[key];
    fetch(key, {
      method: 'HEAD',
      cache: 'no-store',
      credentials: 'same-origin'
    }).then(function (response) {
      if (response && response.ok) {
        setVideoSourceAvailability(key, true);
        if (videoRegionLastGoodSrcCache[regionKey] !== key) {
          videoRegionLastGoodSrcCache[regionKey] = key;
          logVideoRegionStatus('Mirrored video is ready; switching to the new source.', 'region=' + regionKey + ' src=' + key);
          triggerVideoRegionSourceRefresh();
        }
        return;
      }

      setVideoSourceAvailability(key, false);
      logVideoRegionStatus('Mirrored video probe returned unavailable; keeping the old source for now.', 'region=' + regionKey + ' src=' + key, 'warn');
      scheduleVideoSourceProbe(regionKey, key, true);
    }).catch(function () {
      setVideoSourceAvailability(key, false);
      logVideoRegionStatus('Mirrored video probe failed; keeping the old source for now.', 'region=' + regionKey + ' src=' + key, 'warn');
      scheduleVideoSourceProbe(regionKey, key, true);
    });
  }, isRetry ? VIDEO_REGION_RETRY_DELAY_MS : 0);
}

function renderVideoRegion(region, regionContent) {
  var requestedSrc = String(regionContent && regionContent.value || '').trim();
  var requestedSrcVersioned = appendCacheBust(requestedSrc, regionContent && regionContent.cache_bust);
  var regionKey = getVideoRegionCacheKey(region);
  var cachedSrc = regionKey ? String(videoRegionLastGoodSrcCache[regionKey] || '').trim() : '';
  var cachedSrcVersioned = appendCacheBust(cachedSrc, regionContent && regionContent.cache_bust);
  var disableAudio = regionContent && regionContent.disable_audio === undefined ? true : Boolean(regionContent && regionContent.disable_audio);

  if (!requestedSrc) {
    return '';
  }

  if (isDirectlyRenderableSource(requestedSrc)) {
    if (regionKey) {
      videoRegionLastGoodSrcCache[regionKey] = requestedSrc;
    }
    setVideoSourceAvailability(requestedSrc, true);
    return '<div class="template-region video" style="' + region.baseStyle + '"><video src="' + escapeHtml(requestedSrcVersioned) + '" title="' + escapeHtml(region.label) + '" data-disable-audio="' + (disableAudio ? '1' : '0') + '" autoplay' + (disableAudio ? ' muted' : '') + ' loop playsinline preload="auto" disablepictureinpicture oncanplay="this.play().catch(function () {})"></video></div>';
  }

  var requestedState = getVideoSourceAvailability(requestedSrc);
  var requestedReady = Boolean(requestedState && requestedState.available === true);

  if (requestedReady) {
    if (regionKey) {
      videoRegionLastGoodSrcCache[regionKey] = requestedSrc;
    }
    return '<div class="template-region video" style="' + region.baseStyle + '"><video src="' + escapeHtml(requestedSrcVersioned) + '" title="' + escapeHtml(region.label) + '" data-disable-audio="' + (disableAudio ? '1' : '0') + '" autoplay' + (disableAudio ? ' muted' : '') + ' loop playsinline preload="auto" disablepictureinpicture oncanplay="this.play().catch(function () {})"></video></div>';
  }

  scheduleVideoSourceProbe(regionKey, requestedSrc, false);

  if (cachedSrc) {
    if (cachedSrc !== requestedSrc) {
      logVideoRegionStatus('Keeping the previous playable video until the new mirrored file finishes transferring.', 'region=' + regionKey + ' old=' + cachedSrc + ' new=' + requestedSrc);
    }
    return '<div class="template-region video" style="' + region.baseStyle + '"><video src="' + escapeHtml(cachedSrcVersioned) + '" title="' + escapeHtml(region.label) + '" data-disable-audio="' + (disableAudio ? '1' : '0') + '" autoplay' + (disableAudio ? ' muted' : '') + ' loop playsinline preload="auto" disablepictureinpicture oncanplay="this.play().catch(function () {})"></video></div>';
  }

  return '';
}

if (window.pulsePlayerRegionTypes && typeof window.pulsePlayerRegionTypes.register === 'function') {
  window.pulsePlayerRegionTypes.register('video', {
    renderRegion: renderVideoRegion
  });
}