<!--
    Renders an image, resizing it if valid.

    @params img  The image.
    @params size The resize target. Optional.
    @params format Image conversation format. Optional.
-->

<!-- Variable assignment -->

{{- $img := .img -}}
{{- $hint := default ( index $img.Params "hint" ) "" }}
{{- $size := cond ( isset . "size" ) .size "" }}
{{- $isResizable := not ( in ( slice "avif" "svg" "gif" ) $img.MediaType.SubType ) -}}
{{- $format := cond ( isset . "format" ) .format "webp" }}

{{- $permalink := "" -}}

<!-- Validation -->

{{- if ( not ( isset . "img" ) ) -}}
  {{- errorf "No img set" -}}
{{- end -}}

{{- if ne .img.MediaType.MainType "image" -}}
  {{- errorf "Image '%q' is not an image" .img }}
{{- end -}}

{{- if ( isset . "size" ) -}}
  {{- if $isResizable -}}
    {{- $width := ( first 1 ( split .size "x" ) ) -}}
    {{- if gt $width $img.Width -}}
      {{- warnf "Requested size %s is more than image width %d (%q)" $width $img.Width $img.File.Path -}}
    {{- end -}}
  {{- else -}}
    {{- warnf "Size set on non-resizable image of type %s; ignoring" $img.MediaType.SubType -}}
  {{- end -}}
{{- end -}}

<!-- Rendering -->

{{- if $isResizable -}}
  {{- if $size -}}
    {{- if eq $size "same" -}}
      {{- $permalink = ( $img.Process ( printf "%s %s" $format $hint ) ).RelPermalink -}}
    {{- else -}}
      {{- $permalink = ( $img.Resize ( printf "%s %s %s" $size $format $hint ) ).RelPermalink -}}
    {{- end -}}
  {{- else -}}
    {{- if gt $img.Width 1200 -}}
      {{- $permalink = ( $img.Resize ( printf "1200x %s %s" $format $hint ) ).RelPermalink -}}
    {{- else if gt $img.Width 800 -}}
      {{- $permalink = ( $img.Resize ( printf "800x %s %s" $format $hint ) ).RelPermalink -}}
    {{- else -}}
      {{- $permalink = ( $img.Process ( printf "%s %s" $format $hint ) ).RelPermalink -}}
    {{- end -}}
  {{- end -}}
{{- else }}
  {{- $permalink = $img.RelPermalink -}}
{{- end -}}

{{- return $permalink -}}