{{- /*
Renders an embedded YouTube video.

@param {bool} [allowFullScreen=true] Whether the iframe element can activate full screen mode.
@param {bool} [autoplay=false] Whether to automatically play the video. Forces mute to be true.
@param {string} [class] The class attribute of the wrapping div element. When specified, removes the style attributes from the iframe element and its wrapping div element.
@param {bool} [controls=true] Whether to display the video controls.
@param {int} [end] The time, measured in seconds from the start of the video, when the player should stop playing the video.
@param {string} [id] The video id. Optional if the id is provided as first positional argument.
@param {string} [loading=eager] The loading attribute of the iframe element.
@param {bool} [loop=false] Whether to indefinitely repeat the video.
@param {bool} [mute=false] Whether to mute the video. Always true when autoplay is true.
@param {int} [start] The time, measured in seconds from the start of the video, when the player should start playing the video.
@param {string} [title] The title attribute of the iframe element. Defaults to the title returned by YouTube oEmbed API.

@returns {template.HTML}

@reference https://developers.google.com/youtube/player_parameters

@example {{< youtube 0RKpf3rK57I >}}
@example {{< youtube id=0RKpf3rK57I loading=lazy start=30 >}}
*/}}

{{- $pc := .Page.Site.Config.Privacy.YouTube }}
{{- $remoteErrID := "err-youtube-remote" }}
{{- if not $pc.Disable }}
  {{- with $id := or (.Get "id") (.Get 0) }}

    {{- /* Get data from the YouTube oEmbed API. */}}
    {{- $q := querify "url" (printf "https://www.youtube.com/watch?v=%s" $id) "format" "json" }}
    {{- $url := printf "https://www.youtube.com/oembed?%s" $q }}
    {{- $data := dict }}
    {{- with resources.GetRemote $url }}
      {{- with .Err }}
        {{- erroridf $remoteErrID "The %q shortcode was unable to get remote resource %q. %s. See %s" $.Name $url . $.Position }}
      {{- else }}
        {{- $data = .Content | transform.Unmarshal }}
      {{- end }}
    {{- else }}
      {{- erroridf $remoteErrID "The %q shortcode was unable to get remote resource %q. See %s" $.Name $url $.Position }}
    {{- end }}

    {{/* Set defaults. */}}
    {{- $allowFullScreen := "allowfullscreen" }}
    {{- $autoplay := 0 }}
    {{- $class := "" }}
    {{- $controls := 1 }}
    {{- $end := 0 }}
    {{- $loading := "eager" }}
    {{- $loop := 0 }}
    {{- $mute := 0 }}
    {{- $start := 0 }}
    {{- $title := $data.title }}

    {{- /* Get arguments. */}}
    {{- if in (slice "false" false 0) ($.Get "allowFullScreen") }}
      {{- $allowFullScreen = "" }}
    {{- else if in (slice "true" true 1) ($.Get "allowFullScreen") }}
      {{- $allowFullScreen = "allowfullscreen" }}
    {{- end }}
    {{- if in (slice "false" false 0) ($.Get "autoplay") }}
      {{- $autoplay = 0 }}
    {{- else if in (slice "true" true 1) ($.Get "autoplay") }}
      {{- $autoplay = 1 }}
    {{- end }}
    {{- if in (slice "false" false 0) ($.Get "controls") }}
      {{- $controls = 0 }}
    {{- else if in (slice "true" true 1) ($.Get "controls") }}
      {{- $controls = 1 }}
    {{- end }}
    {{- if in (slice "false" false 0) ($.Get "loop") }}
      {{- $loop = 0 }}
    {{- else if in (slice "true" true 1) ($.Get "loop") }}
      {{- $loop = 1 }}
    {{- end }}
    {{- if in (slice "false" false 0) ($.Get "mute") }}
      {{- $mute = 0 }}
    {{- else if or (in (slice "true" true 1) ($.Get "mute")) $autoplay }}
      {{- $mute = 1 }}
    {{- end }}
    {{- $class := or ($.Get "class") $class }}
    {{- $end := or ($.Get "end") $end }}
    {{- $loading := or ($.Get "loading") $loading }}
    {{- $start := or ($.Get "start") $start }}
    {{- $title := or ($.Get "title") $title }}

    {{- /* Determine host. */}}
    {{- $host := cond $pc.PrivacyEnhanced "www.youtube-nocookie.com" "www.youtube.com" }}

    {{- /* Set styles. */}}
    {{- $divStyle := "position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden;" }}
    {{- $iframeStyle := "position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" }}
    {{- if $class }}
      {{- $iframeStyle = "" }}
    {{- end }}

    {{- /* Set class or style of wrapping div element. */}}
    {{- $divClassOrStyle := printf "style=%q" $divStyle }}
    {{- with $class }}
      {{- $divClassOrStyle = printf "class=%q" $class }}
    {{- end }}

    {{- /* Define src attribute. */}}
    {{- $src := printf "https://%s/embed/%s" $host $id }}
    {{- $params := dict
      "autoplay" $autoplay
      "controls" $controls
      "end" $end
      "mute" $mute
      "start" $start
      "loop" $loop
    }}
    {{- if $loop }}
      {{- $params = merge $params (dict "playlist" $id) }}
    {{- end }}
    {{- $s := slice }}
    {{- range $k, $v := $params }}
      {{- $s = $s | append $k }}
      {{- $s = $s | append $v }}
    {{- end }}
    {{- with querify $s }}
      {{- $src = printf "%s?%s" $src . }}
    {{- end }}

    {{- /* Set iframe attributes. */}}
    {{- $iframeAttributes := dict
      "allow" "accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"
      "allowfullscreen" $allowFullScreen
      "loading" $loading
      "referrerpolicy" "strict-origin-when-cross-origin"
      "src" $src
      "style" $iframeStyle
      "title" $title
    }}

    {{- /* Render. */}}
    <div {{ $divClassOrStyle | safeHTMLAttr }}>
      <iframe
        {{- range $k, $v := $iframeAttributes }}
          {{- if $v }}
            {{- printf " %s=%q" $k $v | safeHTMLAttr }}
          {{- end }}
        {{- end }}
      ></iframe>
    </div>
  {{- else }}
    {{- errorf "The %q shortcode requires an id argument. See %s" .Name .Position }}
  {{- end }}
{{- end }}
