{{- $image := false -}}
{{- $isCoverImage := false -}}
{{- $alt := "" -}}
{{- with .Params.cover -}}
  {{- $cover := $.Resources.GetMatch . -}}
  {{- if and $cover (ne $cover.MediaType.SubType "svg") -}}
    {{- $image = $cover -}}
    {{- $isCoverImage = true -}}
    {{- $coverName := path.Base . | replaceRE "\\.[^.]+$" "" -}}
    {{- $coverDataFile := $.Resources.Get (printf "data/images/%s.yaml" $coverName) -}}
    {{- if not $coverDataFile -}}
      {{- $coverDataFile = $.Resources.Get (printf "data/%s.yaml" $coverName) -}}
    {{- end -}}
    {{- $coverData := dict -}}
    {{- if $coverDataFile -}}
      {{- $coverData = $coverDataFile.Content | transform.Unmarshal -}}
    {{- end -}}
    {{- $alt = index $coverData "description" | default "" -}}
    {{- if not $alt -}}
      {{- $alt = index $coverData "title" | default "" -}}
    {{- end -}}
  {{- end -}}
{{- end -}}
{{- if not $image -}}
  {{- $logoPath := site.Params.logo | default "logo-large.png" -}}
  {{- $logo := resources.GetMatch $logoPath -}}
  {{- if and $logo (ne $logo.MediaType.SubType "svg") -}}
    {{- $image = $logo -}}
  {{- end -}}
{{- end -}}
{{- if not $alt -}}
  {{- if and $image $isCoverImage -}}
    {{- if and .IsPage (not .IsHome) -}}
      {{- $alt = printf "Image de partage pour %s" .Title -}}
    {{- else -}}
      {{- $alt = printf "Logo du site %s" site.Title -}}
    {{- end -}}
  {{- else if $image -}}
    {{- $alt = printf "Logo du site %s" site.Title -}}
  {{- end -}}
{{- end -}}
{{- $data := dict -}}
{{- if $image -}}
  {{- $data = dict
    "url" $image.Permalink
    "alt" ($alt | strings.TrimSpace | truncate 420)
  -}}
  {{- with $image.Width -}}
    {{- $data = merge $data (dict "width" .) -}}
  {{- end -}}
  {{- with $image.Height -}}
    {{- $data = merge $data (dict "height" .) -}}
  {{- end -}}
{{- end -}}
{{- return $data -}}